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class="img"><img src="/data/upload/thumb/5c7bdc5100538.jpg" id="imgs"></div> <span><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(255, 255, 255); overflow-wrap: break-word !important; background-color: rgb(61, 167, 66);"><br class="" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important;"/>一、細石混凝土地面收縮裂縫的成因 </span></strong></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">細石混凝土地面收縮是由于混凝土收縮變形受到約束所引起，其中主要有<span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(61, 167, 66); overflow-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;">混凝土塑性沉縮裂縫、混凝土干燥收縮變形裂縫、溫度脹縮變形裂縫等</strong></span>。 </p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(61, 167, 66); overflow-wrap: break-word !important;">1、塑性沉縮裂縫</span></strong></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">塑性沉縮裂縫是混凝土的一種早期裂縫，即在澆注完混凝土 4～15 小時(shí)左右，水泥水化反應劇烈，出現泌水和水分急劇蒸發(fā)現象，引起失水收縮。尤其在變截面處易發(fā)生劇烈收縮，此時(shí)骨料與膠合料之間也產(chǎn)生不均勻的沉縮變形。水分大量蒸發(fā)引起的混凝土塑性沉縮裂縫與沉凝土的流態(tài)有關(guān)，一般流態(tài)越大，越容易引起沉縮裂縫。塑建筑工程論文性沉縮裂縫發(fā)生時(shí)，在混凝土表面出現斷斷續續的裂縫，裂縫中部較寬，兩端較窄，呈梭形。對于混凝土地面，裂縫常出現在混凝土厚度變化處或管線(xiàn)敷設處。如果混凝土水灰<span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; line-height: 1.6; overflow-wrap: break-word !important;">比過(guò)大，水泥用量大，摻和料保水性差，粗骨料少，用水量大，振搗不良，環(huán)境氣溫高，養護不足表面失水能導致混凝土會(huì )出現塑性沉縮裂縫。為了避免混凝土出現塑性裂縫，可在混凝土還處在塑性狀態(tài)時(shí)，適時(shí)予以拍打，促其表面裂縫閉合，恢復整體性。 </span></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(61, 167, 66); overflow-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;">2、干燥收縮裂縫</strong></span></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">混凝土澆筑完畢要經(jīng)過(guò)一定濕養護期，在此期間因飽含水分而體積基本不變。以后混凝土在空氣中，逐漸硬化，水分散發(fā)，體積發(fā)生收縮?；炷恋母稍锸湛s主要是由于水泥石的脫水收縮，其中收縮是發(fā)生在**次干燥之后，以后逐漸減慢，大部分收縮在齡期 3 個(gè)月內出現，但齡期超過(guò) 20 年后收縮仍不會(huì )中止。當混凝土的收縮應變超過(guò)結構的軸心受拉峰值應變時(shí)，混凝土內部和表面就會(huì )形成裂縫，隨著(zhù)應變的增加，裂縫也隨之發(fā)展。因為結構很薄，混凝土地面收縮裂縫一般是貫穿性裂縫。 </p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(61, 167, 66); overflow-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;">影響混凝土的收縮變形的主要因素有以下幾個(gè)方面：</strong></span></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">①水泥的品種和用量。</p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">不同品種和質(zhì)量的水泥，收縮變形值不等，如早強水泥比普通水泥的收縮約大 10%，混凝土中的水泥用量和水灰比越大，收縮量越大。</p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">②混凝土骨料的性質(zhì)料徑和含量。 </p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">骨料含量大，彈性模量值高者，收縮越小，料徑大者，對水泥漿收縮的約束大，且達到相同稠度所需的用水量少，收縮量也小。</p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">③養護條件。及時(shí)完善的養護能夠加速水泥的水化作用，減少收縮量，養護不完善，將加大干燥環(huán)境中的收縮。</p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">④使用期的環(huán)境條件。</p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">結構所處的溫度高、濕度低，都增大水分的蒸發(fā)，收縮量大。</p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">⑤構件的形狀和尺寸。</p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">混凝土中水分蒸發(fā)**經(jīng)由結構表面。故結構的體積與表面積之比越小，水分蒸發(fā)量越大，混凝土收縮越大。 </p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(61, 167, 66); overflow-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;">3、溫度脹縮變形裂縫</strong></span></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">混凝土溫度裂縫起因于溫度應變受到約束。溫度應變起因于溫差。關(guān)于溫差有兩種情況，一種是混凝土的截面平均溫度與環(huán)境大氣的平均溫度之差；另一種是混凝土的表面溫差，即混凝土截面中心溫度與混凝土表面溫度之差。起因于這種表<span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; line-height: 1.6; overflow-wrap: break-word !important;">里溫差的表層溫度收縮應變要受到內部約束，從而引起外部裂縫。當溫度脹縮引起的混凝土內部應力大于混凝土抗拉強度時(shí)，會(huì )引起混凝土裂縫。由于混凝土薄板的厚度遠遠小于其他兩個(gè)方向的尺寸，因此溫度脹縮引起的一般也是貫通裂縫。另外由于環(huán)境溫度濕度變化，在混凝土板面與底面之間形成溫度，濕度差異，混凝土下部的粘接層會(huì )約束混凝土板表面產(chǎn)生的脹縮變形。如果在溫度施工中設計了分格縫，則混凝土板面容易在分格縫處產(chǎn)生翹曲變形。 </span></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(61, 167, 66); overflow-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;">4、混凝土地面基層變形引起的裂縫 </strong></span></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">混凝土地面結構樓板變形引起的裂縫：在超長(cháng)結構或跨度比較大的樓板上做細石混凝土地面，也容易產(chǎn)生地面裂縫。原因是，鋼筋混凝土結構樓板本身存在溫度變形、收縮變形或撓度變形等，這種變形和混凝土地面的變形是不同步的，如果程度較大，**會(huì )引起其表層地面的裂縫，一般這種裂縫很難修復。 </p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">混凝土地面基層墊層材料引起的變形裂縫：樓板細石混凝土地面一般的施工做法是，先做一層50mm～80mm 厚的墊層，表面再做細石混凝土面層。墊層一般為 1∶6 水泥焦砟或是輕集料混凝土，前者焦砟如果煅燒不充分，則在潮濕的環(huán)境下容易引起墊層膨脹，從而會(huì )引起混凝土地面的裂縫。 </p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(255, 255, 255); overflow-wrap: break-word !important; background-color: rgb(61, 167, 66);">二、混凝土地面裂縫控制措施 </span></strong></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">對大面積細混凝土細地面裂縫的控制，需根據混凝土地面板本身的特點(diǎn)，從設計、材料及配合比和施工等各方面綜合考慮，統籌處理。 <br/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(61, 167, 66); overflow-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;">1、合理配置鋼筋</strong></span></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">配置鋼筋是控制混凝土裂縫的重要手段之一，對混凝土地面，主要是配置適當防裂鋼筋網(wǎng)片，防裂鋼筋為構造配筋。 </p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">位于混凝土表面下 50mm 左右，一般要求鋼筋不宜太粗，間距控制在150mm 以下。此做法適用于基礎底板上的混凝土地面，可有效防止地面裂縫。合理配置鋼筋，也要求結構樓<span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; line-height: 1.6; overflow-wrap: break-word !important;">板的配筋設計要優(yōu)化，尤其對超長(cháng)、大跨結構，樓板鋼筋宜上、下層通長(cháng)配置。筆者曾遇到一個(gè)工程，鋼筋混凝土框架剪力墻結構，超長(cháng)，柱網(wǎng)布置為 8×8。設計沒(méi)有考慮混凝土溫度收縮應力，地下室樓板只在梁的負彎矩處設計了負彎矩鋼筋，而且負彎矩鋼筋長(cháng)度只到板跨的三分之一處，結果因為濕度應力和混凝土收縮，造成結構樓板在負彎矩端部位置出現有規律的裂縫，也造成表面混凝土地面開(kāi)裂。 </span></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(61, 167, 66); overflow-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;">2、全理設置分格縫</strong></span> </p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">設置分格縫也是混凝土地面為控制其收縮裂縫常采取的一項措施，接縫間距設置越大，混凝土板塊收縮越大。接縫張開(kāi)愈寬，分格縫傳荷能力越低，從而越容易引起裂縫，因此合理設置分格縫尤為重要。根據施工規范規定，混凝土或水泥地面分格縫設置板塊面積不宜大于 36 平方米。分格縫一般沿軸線(xiàn)和跨中進(jìn)行分格，根據計算分析以及實(shí)際施工經(jīng)驗，板塊分隔長(cháng)度不宜大于 8 米。分格縫的設置，一般有兩種做法：一種是在混凝土地面施工前根據分格縫設計，提前將木條或塑料條用水泥漿固定，養護 24 小時(shí)后，再進(jìn)行地面施工。另一種是后切縫，先進(jìn)行混凝土地面施工，常溫下養護5～7 天，強度達到 75%（不宜大于 ****）后用切割機切縫，縫寬 7mm～10mm，深度為厚度二分之一左右?？p深度不宜過(guò)小，也不宜過(guò)大，否則造成混凝土地面板的開(kāi)裂或翹曲。 </p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(61, 167, 66); overflow-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;">3、原材料控制</strong></span></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">混凝土強度等縱不小于 C20，不宜大于 C30，因為隨著(zhù)混凝土強度的增大，混凝土的收縮也加大?；炷潦橇綖?15mm，含泥量不得大于 3%，沙子為中沙?；炷撂涠炔灰诉^(guò)大，控制在 30mm 左右，以泥抹子輕拍可出漿為宜，如果采用機械拋光工藝，混凝土坍落度可控制在 120mm～140mm。 </p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><br data-filtered="filtered" style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;"/></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(61, 167, 66); overflow-wrap: break-word !important;"><strong style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; overflow-wrap: break-word !important;">4、施工過(guò)程控制</strong></span></p><p style="margin: 0px; padding: 0px; max-width: ****; box-sizing: border-box !important; word-wrap: break-word !important; clear: both; min-height: 1em; font-style: normal; font-variant: normal; font-weight: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; color: rgb(62, 62, 62); font-family: 微軟雅黑; font-size: 16px; letter-spacing: normal; line-height: 25.6px; text-align: start; overflow-wrap: break-word !important; background-color: rgb(255, 255, 255);">基層清理要干凈，清除混凝土基層上的砂漿、油漆等雜物，使之露出混凝土結構板原色建筑工程論文，基層要灑水濕潤 24 小時(shí)以上。推薦機械拋光工藝，混凝土要振搗密實(shí)。管線(xiàn)距墻陰陽(yáng)角不得小于 15cm，防止集中應力的出現。所有管線(xiàn)處**加鋪雙層硬質(zhì)鋼板網(wǎng)，寬度不小于 30cm，防止該部位裂縫。加強養護工作，用滿(mǎn)鋪一層塑料薄膜或木屑粉覆蓋灑水保持濕潤，養護至少 7 天，強度上來(lái)之前嚴禁上人，并加強成品保護。 <br/></p><p><br/></p></span> </div> <div id="i40w6ka" class="fanye"> <span id="iw0wqe0" class="fl">上一篇：<a href="#">沒(méi)有了</a></span> <span id="ekamwks" class="fr">下一篇：<a href="http://www.seot18.com/html/news/jishuzhichi/141.html">環(huán)氧樹(shù)脂地坪漆鼓包現象分析 </a></span> 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