聚丙烯酸酯对活性粉末混凝土性能的影响研究

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1、摘要本文以活性粉末混凝土(ReactivePowderConcrete，简称RPC)的基本配制原理为基础，结合国内外活性粉末混凝土的研究现状与存在问题，通过室内试验，探讨了聚合物对RPC性能的影响与改善作用。试验选用水泥一矿渣一硅灰三组分的胶凝材料体系，以净浆流动度为目标，探讨了高效减水剂与粉末材料、聚丙烯酸酯(PolyacrylicEster，简称PAE)聚合物之间的相容性，并优选出在低水胶比下与水泥、活性粉末相容性较好的高效减水剂；以胶砂流动度、强度为目标，优选出ILPC的最佳减水剂掺量、水胶比(W／B)、砂胶比(S／B)、胶凝材料配比以及适

2、宜的搅拌时间。在成功配制RPC的基础上，重点研究了聚丙烯酸酯聚合物掺量、养护制度、矿物掺合料对活性粉末混凝土力学性能和干缩性能的影响。进一步结合微观测试手段，揭示聚合物对RPC的改性机理。研究结果表明：聚合物的掺入使得RPC的抗折强度提高，抗压强度有所下降，折压比增大，改善了不掺钢纤维时RPC的韧性；矿物掺合料对聚合物活性粉末混凝土的强度有明显改善作用。标养条件下的RPC干燥收缩较大，聚合物的掺入改善了RPC在标养下的干缩；热养护后RPC干缩显著降低，聚合物的掺入对其没有明显的影响。关键词活性粉末混凝土，聚丙烯酸酯聚合物，强度，干缩性能，养护制度

3、ABSTRACTInlightofbasiccompositionofReactivePowderConcrete0RPC)，mainlystudiedaretheinfluenceandameliorationeffectofpolymeronthebehaviorsofRPCthroughindoortestsaccordingtothestatusquoandproblemsofRPCathomeandabroad．Toselectcementationsmaterialcomposedofcement-一slag-silicafumefo

4、ratrial，underthetargetofconcretemobility，discussedarethecompatibilityamongsuperplasticizer，powdermaterialandPolyacrylicEster(PAE)SOastoselectthesuperplasticizerofbettercompatibilitywithcementandreactivepowderinlowratiowater-binder,andunderthetargetofmortarmobilityandstrength,

5、toselectoptimumadmixtureofsuperplasticizerforRPC，water-binderratioandsand-binderratio,bindermaterialcompositionproportion,andpropermixtureperiod．BasedonsuccessfucompositionofRPC，emphasisislaidoneffectsofpolyacrylicesterpolymeradmixture，cLLringsystem，mineraladmixtureonmechanic

6、performanceandplasticshrinkageofreactivepowderconcrete．Witllfurthercloserobservation,ameliorationeffectofpolymeronRPCisrevealed．Theresearchresultsdemonstratethatblendingofpolymerimprovesflexuralstrengthbutmakesdurabilitystrengthdecline．Thereforetheflexuralanddurabilityratioin

7、crease．ThusdurabilityofRPCwithoutsteelfiberisimproved．Thestrengthofpolymerreactivepowderconcreteisremarkablymelioratedwithblendingofmineraladmix-Rn'e．RPCshowsgreatcapabilityforplasticshrinkageunderstandardcondition,butblendingofpolymerimprovesplasticshrinkagepropertyofRPC。The

8、plasticshrinkagecapabilitygreatlydeclinesundercuringcondition，butadd