SAP对低收缩超高性能混凝土性能的影响

摘要针对机制砂超高性能混凝土水胶比极低,后期干燥收缩较大等问题,探究了SAP内养护效果对混凝土工作性能、力学性能及耐久性的影响。研究表明,浆体中掺入SAP可提升混凝土的体积稳定性,但会降低其抗压强度。采用掺量为0.3%,粒径为75~125μm的C型SAP时,其内养护效应最佳,在SAP颗粒周围形成致密的层面过渡区壳,可最大程度减小SAP对混凝土的抗压强度的负面作用。 In order to solve the problem of high shrinkage faced by manufactured sand ultrahigh performance concrete(UHPC)low water/binder ratio,this paper investigate the internal curing effect of super absorbent polymer(SAP)on the workability,mechanical proper ties and durability of UHPC.The results show that the incorporation of SAP into UHPC can improve its volume stability,while decreases its mechanical strength.When 0.3%of SAP with particle sizes between 75~125μm is added into UHPC,the SAP can exhibit its internal curing effect optimally.In that situation,the compact interfacial transition shells around the SAP particles can mitigate the negative effect of SAP on the mechanical strength of UHPC to the largest extent.

作者胡世勇张高展杨军丁庆军 HU Shiyong;ZHANG Gaozhan;YANG Jun;DING Qingjun(Third Branch,Poly Changda Engineering Co.,Ltd.,Guangzhou 511430,China;Anhui Province Engineering Laboratory of Advanced Building Materials,Hefei 230022,China;School of Material Science and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区保利长大工程有限公司第三分公司安徽省先进建筑材料工程实验室安徽建筑大学材料与化学工程学院武汉理工大学材料科学与工程学院

出处《混凝土》 CAS 北大核心 2021年第3期54-58,共5页 Concrete

基金国家自然科学基金资助(51878003) 国家重点研发计划重点基础材料技术提升与产业化重点专项资助(2017YFB0310105) 湖北省重大科技专项资助(2018AAA001)。

关键词机制砂超高性能混凝土体积收缩 SAP 内养护效应抗压强度 manufactured sand UHPC volume shrinkage SAP internal curing effect compressive strength

分类号 TU528.01 [建筑科学—建筑技术科学]