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style="text-align: center;"><img loading="lazy" src="https://p.9136.com/00/l/c2dbcec42_2.jpg" alt="水利工程混凝土冬季施工淺談?wù)撐?/></p><p>　　1.1水泥混凝土配料需要滿(mǎn)足的要求</p><p>　　水泥混凝土的性能與其材料的選用有著(zhù)緊密的聯(lián)系，在混凝土配料的選用時(shí)需要保證其具有抗壓、抗拉、抗凍、抗裂等性能，良好的材料選用是保障施工質(zhì)量的前提。在選用配料的過(guò)程中除了對混凝土的強度等級有要求外，還需要保證工地施工中對混凝土和易性的要求，和易性主要包括混凝土的流動(dòng)性、粘聚性和保水性等三個(gè)方面的要求，混凝土的流動(dòng)性是指拌合好的混凝土具有一定的流動(dòng)性并能均勻密實(shí)的填滿(mǎn)所建模板的能力，而流動(dòng)性的高低主要反映的是混凝土中含水率的高低以及坍落度的大小，混凝土的流動(dòng)性對于澆筑后的振搗作業(yè)有著(zhù)直接的影響。而混凝土的粘聚性的高低則是保障運輸過(guò)程中不會(huì )發(fā)生離析現象，在澆筑完成后，如果混凝土中流出一定的水分則意味著(zhù)此混凝土拌合物的保水性較差，無(wú)法產(chǎn)生較為密實(shí)的混凝土結構，從而對于水利工程的混凝土結構強度產(chǎn)生嚴重的影響。</p><p>　　1.2水泥混凝土品種的選取</p><p>　　由于水利工程需要具有極高的耐久性、防水性，同時(shí)對于強度也要求很高，因此在選用何種水泥混凝土配比方案時(shí)需要先進(jìn)行試件的澆筑作業(yè)，對完成的混凝土試件進(jìn)行相應的性能測試，直至選用到較為合理的'配比方案，而對于水位變化區外的混凝土區域，則需要選用有耐磨性和抗凍性要求的混凝土配比方案，可以選用中熱硅酸鹽水泥或硅酸鹽水泥等，在滿(mǎn)足混凝土各項性能的前提下又能夠極大的減小混凝土的發(fā)熱量，從而減少溫度裂縫的產(chǎn)生。</p><p>　　1.3在混凝土選材與拌合過(guò)程中采取的措施</p><p>　　在進(jìn)行水利工程施工過(guò)程中需要進(jìn)行大量的混凝土作業(yè)，因此，在施工的過(guò)程中需要注意防止裂縫的產(chǎn)生，文章將就如何減少裂縫出現的措施進(jìn)行介紹：將混凝土的內外溫差盡量控制在25℃以?xún)龋谶x用混凝土時(shí)需要盡量選用水化熱量較低的混凝土配合比，減少混凝土水化熱的產(chǎn)生可以盡量的縮小混凝土的內外差，同時(shí)需要在混凝土中摻入一定的外加劑（減水劑）、摻合料（多為粉煤灰）等以減少混凝土配比中的用水量，提高混凝土的和易性和強度。同時(shí)，還需要選用材質(zhì)性能較好的粗細骨料。為了降低混凝土的膨脹系數，需要在混凝土中添加一定的膨脹劑、減縮劑等來(lái)控制混凝土的收縮量。在進(jìn)行施工時(shí)需要嚴格控制混凝土的配合比，攪拌好的混凝土不能在施工現場(chǎng)臨時(shí)添加水，在進(jìn)行混凝土的澆筑時(shí)，對于大壩大體積的混凝土施工需要盡量的采用薄層、間歇短和均勻澆筑的方式完成混凝土的澆筑。</p><p>　　<strong>2水利工程中的混凝土攪拌和澆筑技術(shù)</strong></p><p>　　混凝土的攪拌、澆筑是保障混凝土施工的重要一環(huán)，需要引起足夠的重視。現今，在一些不大的水利工程中，對于混凝土的攪拌采用現場(chǎng)單機攪拌的方式，生產(chǎn)量小同時(shí)也無(wú)法精確保證材料的配合比，而且由于各個(gè)施工隊伍的技術(shù)水平不一，導致在這些水利工程中使用的水泥混凝土一直處于低質(zhì)、低效的狀態(tài)，從而造成建設完成的水利工程的質(zhì)量不高，水利工程的強度與耐久性等都相對不足。所以，為了確保水利工程的施工質(zhì)量，采用高性能、高效率的水泥混凝土攪拌站進(jìn)行混凝土的拌合工作是十分必要的，在進(jìn)行混凝土的攪拌工作時(shí)，需要對砂石、水泥的用量進(jìn)行精確的控制，完成攪拌的混凝土在現場(chǎng)施工時(shí)操作人員不得隨意進(jìn)行加水，從而影響水泥混凝土的性能，同時(shí)，攪拌的混凝土需要嚴格按照設計要求選用混凝土的配合比。在冬季由于外部溫度較低，因此，在進(jìn)行混凝土的澆筑時(shí)需要控制混凝土內外溫度差，混凝土內的溫度是由于混凝土水化時(shí)所產(chǎn)生的，當外界溫度較低時(shí)，表面的混凝土會(huì )很快的完成與外部的熱交換而造成溫度下降，從而影響混凝土的澆筑效果。完成混凝土澆筑后的最初幾個(gè)小時(shí)是十分重要的，在這一時(shí)期，由于周?chē)鷾囟容^低，造成混凝土的水分進(jìn)行多次的凝固-融化-再凝固的過(guò)程，從而對混凝土的耐久性產(chǎn)生極大的影響，而通過(guò)試驗發(fā)現，在完成混凝土的澆筑后使新拌合的混凝土還溫一段時(shí)間，使得澆筑的混凝土能夠達到臨界強度后，就可以免受外部溫度較低所產(chǎn)生的冰凍傷害。現今，在冬季混凝土施工中多采用的是：</p><p>　　（1）添加防凍劑的方法是一種是用較為廣泛的方法，此種方法相對于其他的施工方法具有施工工藝簡(jiǎn)單、能耗較低且成本低廉的特點(diǎn)，能夠廣泛的推廣使用。</p><p>　　（2）材料預熱法，此種方法是先對砂石以及拌合混凝土的水進(jìn)行一定的加熱，從而使得混凝土具有一定的熱量，此種方法是為了使水泥的水化作用保持一個(gè)較高的初始值。此外，還有蓄熱保溫法、添加克拉絲纖維法等。在冬季施工時(shí)可以采用多種方法結合使用的方法來(lái)確保施工質(zhì)量。</p><p>　　<strong>3結束語(yǔ)</strong></p><p>　　水利工程的冬季混凝土施工是一項較為困難的工程，極易產(chǎn)生裂縫進(jìn)而影響施工質(zhì)量，文章主要對冬季施工過(guò)程中需要注意的一些注意事項進(jìn)行介紹。</p><script>s("content_relate");</script> </div> <script type="text/javascript">s("download_bottom");</script> </div> <script type="text/javascript">s("list_wenzhangtuijian");</script> </div> <div id="rq7mugpcpf" class="main-right"> <div id="rq7mugpcpf" class="right_fix"> <script type="text/javascript">s("right_top");</script> <script 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