高吸水聚合物材料对混凝土收缩性能的影响  

Effect of super absorbent polymer on shrinkage of concrete

作　　者：颜朋辉 王永[1] YAN Penghui;WANG Yong(Architectural Engineering Department,Henan College of Transportation,Zhengzhou 451460,China)

机构地区：[1]河南交通职业技术学院建筑工程系,河南郑州451460

出　　处：《混凝土》2023年第9期116-121,共6页Concrete

摘　　要：在混凝土中掺入具有吸附和脱附能力的高吸水性聚合物(SAP)可以达到内养护的效果。通过宏观和微观试验,分析了SAP掺量、粒径和掺水方式对混凝土和易性、收缩率抗氯离子渗透性能的影响。结果表明,预吸SAP能提高混合料的坍落度,而不吸水的SAP和预吸SAP能降低混合料的坍落度。SAP有效地降低了混凝土的收缩性能,提高了混凝土的抗碳化和抗氯离子渗透能力。微观测试结果表明,SAP能有效改善材料的微观结构,细化材料的孔结构。掺入SAP后,混凝土中的凝胶孔和小毛孔增大,大毛孔和气孔减小。Adding super absorbent polymer(SAP)with adsorption and desorption ability into concrete can achieve the effect of internal curing.The influences of the volume,particle size and ways of entrained water of SAP on the workability,shrinkage and chloride penetration resistance of concrete were analyzed through the macroscopic and microscopic test.The results show that pre-absorbed SAP can increase the slump of the mixture,but SAP without water absorption and pre-absorbed SAP with the deduction of internal curing water from mixing water can reduce the slump.SAP effectively reduces the shrinkage of concrete,improves the concrete′s abilities of carbonation resistance and chloride penetration resistance.The microscopic test results show that SAP can effectively improve the micro structure and make the pore structure refined.When SAP is added into concrete,the gel pores and small capillary pores are increased,the size of big capillary pores and air pores are reduced.

关 键 词：高吸水性聚合物 收缩率 和易性 孔隙率 

分 类 号：TU528.041[建筑科学—建筑技术科学]