水利与建筑工程学报
水利與建築工程學報
수리여건축공정학보
TECHNIQUE OF SEEPAGE CONTROL
2015年
1期
126-129
,共4页
减蒸剂%高性能混凝土%塑性开裂%养护方式
減蒸劑%高性能混凝土%塑性開裂%養護方式
감증제%고성능혼응토%소성개렬%양호방식
evaporation reducing agent%high performance concrete%plastic cracking%curing methods
高性能混凝土在塑性阶段早期很容易发生开裂，适宜的早期养护措施是防止或减免高性能混凝土塑性开裂的重要途径。通过早期抗裂试验研究了减蒸剂对高性能混凝土塑性开裂的影响。结果表明：采用混凝土抹面后立即喷减蒸剂方法可以减小混凝土表面水分散失，将养护起始时间提前到混凝土塑性阶段的起点，弥补混凝土表面未及时覆盖造成快速失水的不足。但是，单独使用减蒸剂来抵抗混凝土塑性开裂的效果不明显，由于减蒸剂减缓水分蒸发的作用存在时效性，减蒸剂与覆盖塑膜养护（或涂刷养护剂）相结合才能更好的防止高性能混凝土塑性开裂。
高性能混凝土在塑性階段早期很容易髮生開裂，適宜的早期養護措施是防止或減免高性能混凝土塑性開裂的重要途徑。通過早期抗裂試驗研究瞭減蒸劑對高性能混凝土塑性開裂的影響。結果錶明：採用混凝土抹麵後立即噴減蒸劑方法可以減小混凝土錶麵水分散失，將養護起始時間提前到混凝土塑性階段的起點，瀰補混凝土錶麵未及時覆蓋造成快速失水的不足。但是，單獨使用減蒸劑來牴抗混凝土塑性開裂的效果不明顯，由于減蒸劑減緩水分蒸髮的作用存在時效性，減蒸劑與覆蓋塑膜養護（或塗刷養護劑）相結閤纔能更好的防止高性能混凝土塑性開裂。
고성능혼응토재소성계단조기흔용역발생개렬，괄의적조기양호조시시방지혹감면고성능혼응토소성개렬적중요도경。통과조기항렬시험연구료감증제대고성능혼응토소성개렬적영향。결과표명：채용혼응토말면후립즉분감증제방법가이감소혼응토표면수분산실，장양호기시시간제전도혼응토소성계단적기점，미보혼응토표면미급시복개조성쾌속실수적불족。단시，단독사용감증제래저항혼응토소성개렬적효과불명현，유우감증제감완수분증발적작용존재시효성，감증제여복개소막양호（혹도쇄양호제）상결합재능경호적방지고성능혼응토소성개렬。
High performance concrete cracking is likely to occur at the early plastic stage ,applications of appropriate ear-ly curing measures are important approaches of preventing or reducing the cracking .Here ,the impact of evaporation re-ducing agent on the plastic cracking of high performance concrete was studied through early crack resistance tests .The re-sults suggest that the application of evaporation reducing agent right after the coating of the concrete can reduce the sur-face moisture loss ,and advance the maintenance starting time to the starting point of the concrete plastic stage ,which will prevent the rapid water loss due to the exposure of concrete surface which isn’t covered in time .However ,the appli-cation of evaporation reducing agent alone has little impact on cracking control .Due to the timeliness of its effect on re-ducing the evaporation ,the combination of the agent and plastic film curing (or coating curing agent ) should be applied in order to better prevent the occurrence of the cracking .
