聚羧酸减水剂含固量测试结果影响因素的研究

关键字：聚羧酸减水剂,含固量,实测值,理论值,偏差

（广州市建筑科学研究院有限公司，广东 广州  510440）

    摘要：采取重量法系统地研究母液种类、试验样品量、烘干时间、烘干温度、复配材料等因素对聚羧酸减水剂（PCE）含固量测试测试值的影响。结果表明：按照现行国家标准GB/T 8077—2012《混凝土外加剂匀质性试验方法》规定的重量法测试聚羧酸减水剂含固量时，因操作方法不统一，常常出现实测值与理论值存在较大偏差的情况。当取样量在4 g左右、烘干时间为4~6 h、烘干温度为105 ℃时，聚羧酸母液及成品含固量的测试结果与理论值较为吻合。
    关键词：聚羧酸减水剂；含固量；实测值；理论值；偏差
    中图分类号：TU528.042.2           文献标识码：A          文章编号：1001-702X（2017）07-0011-03

Study on the influencing factors of solid content of poly carboxylic acid water reducing agent
ZHONG Kaihong，SHAO Qiang，ZHANG Zhansong，SUN Shenmei
（Guangzhou Institute of Building Science Co. Ltd.，Guangzhou 510440，China）

    Abstract：This paper tested the solid content of poly carboxylic acid water reducing agent（PCE） by weight method and sys-tematically studied the liquor types，sample quality，the baking time，temperature，composite material on the impact of test values. Results showed that，when test the solid content according to the existing national standard GB/T 8077—2012 "Methods for testing uniformity of concrete admixture"，the measurement of solid content of PCE was prone to deviate from this theoretical value because of using different testing methods. When the amount of sample near 4 g and the drying time between 4~6 h and the drying temperature to 105 ℃，the test value agreed well with the theoretical value of PCE.
    Key words：poly carboxylic acid water reducing agent，solid content，actual value，theoretical value，bias