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淀粉接枝丙烯酸丙烯酰胺内养护剂的制备及性能研究

作者：郭睿1，汪焮成2，雷丽君2，熊龙1，赵日煦1

关键字：淀粉,接枝,丙烯酸,丙烯,酰胺,内,养护,剂,的,

　
（1.中建商品混凝土有限公司，湖北 武汉  430205；
2.湖北省交通运输厅工程质量监督局，湖北 武汉  430014）
    摘要：以丙烯酰胺，中和度为70%的丙烯酸及亲水性好、接枝活性高的木薯淀粉为原料，合成了一种淀粉接枝混凝土内养护剂。通过红外光谱和XRD分析了该内养护剂的结构特征，通过混凝土性能分析、水化热测试、混凝土内部相对湿度和收缩率测试分析了该内养护剂的性能。结果表明：该内养护剂对混凝土的流动性和含气量无不良影响，且能一定程度提高混凝土的后期强度；同时能有效降低水化热对混凝土结构的破坏作用，明显增大高强混凝土内部的相对湿度、减小混凝土收缩、提高其耐久性。
    关键词：淀粉接枝；丙烯酸丙烯酰胺；混凝土内养护剂；水化热；收缩率；耐久性
    中图分类号：TU528.042          文献标识码：A          文章编号：1001-702X（2020）10-0081-04
 
Preparation and properties of a starch grafted acrylic acid and acrylamide internal curing agent
GUO Rui1，WANG Xincheng2，LEI Lijun2，XIONG Long1，ZHAO Rixu1
（1.China Construction Ready Mixed Concrete Co. Ltd.，Wuhan 430205，China；
2.Hubei Provincial Department of Transportation Engineering Quality Supervision Bureau Co. Ltd.，Wuhan 430014，China）
    Abstract：A starch grafted concrete curing agent was synthesized by acrylamide，acrylic acid whose neutralization was 70% and tapioca starch with good hydrophilicity and high grafting activity. The structural characteristics of the internal curing agent were analyzed by infrared spectroscopy and XRD，meanwhile its properties were analyzed by concrete performance analysis，hydration heat measurement，concrete internal relative humidity and shrinkage test. The results show that the internal curing agent has no adverse effect on the fluidity and gas content of concrete，and can improve the late strength of concrete to a certain extent. At the same time，the curing agent can effectively reduce the damage of concrete by hydration heat，obviously improve the relative humidity inside high-strength concrete，reduce concrete shrinkage and improve durability.
    Key words：starch grafting，acrglic aciel and acrylamide，concrete curing agent，hydration heat，shrinkage，durability