具有黏土耐受性缓凝剂的制备及在混凝土中的应用
Synthesis of Phosphate Retarder with Anti-clay Ability and Its Application in Concrete
关键词：
磷酸盐缓凝剂；抗黏土；凝结时间；水化热；混凝土
Key words：
Phosphate retarder; Anti-clay ability; Setting time; Hydration heat of cement; Concrete
刊期：
２０19年第8期
DOI：
10.19761/j.1000-4637.2019.08.005.04
文章编号：
基金项目：
“十三五”国家重点研发计划项目（2017YFB0310100）；江苏省自然科学青年基金（BK20160105）；国家自然科学青年基金（51508242）；江苏省科技成果转化项目（BA2017038）。
作者：
王 兵，范士敏，亓 帅，王 涛，马建峰，韩 正，冉千平
单位：
江苏苏博特新材料股份有限公司 高性能土木工程国家重点实验室，南京 211103
摘要
摘 要：合成了一种含不同磷酸基个数的有机磷酸盐缓凝剂，并将其结构、缓凝性能及抗黏土性能进行了测试表征。混凝土试验测试结果表明，合成出的磷酸盐缓凝剂能延缓水泥水化，缓凝作用好，与聚羧酸减水剂（PCE）复配后，提高了聚羧酸减水剂（PCE）的保坍性能。同时磷酸基缓凝剂还具有很好的抗黏土性能，吸附性能测试表明，所合成的磷酸盐缓凝剂能减少蒙脱土对减水剂的吸附。
Abstract：A new structure of phosphate retarder with different amount of phosphate groups was systhesized. The chemical structures of these retarders were determined by Fourier transform infrared. The properties of setting time, anti-clay ability and adsorption properties of the phosphate retarders after compound with polycarboxylate acid-based superplastizer(PCE) were studied. The experimental results indicate that the phosphate retarders showe a good performance in terms of workablility retention, retarding ability and anti-clay ability, and the phosphate retarders can reduce the adsorption amount of PCE on montmorillonid.
结论
（1）通过调节磷酸单体的加入比例，合成了不同磷酸基团比的有机磷酸缓凝剂。
（2）混凝土的凝结时间测定表明，合成的缓凝剂缓凝效果好，能明显延缓水泥凝结，缓凝性能与蔗糖相似，但较蔗糖能减少混凝土泌水率，且随着磷酸基团比的增加，缓凝效果增强。
（3）抗黏土试验表明，合成的有机磷酸盐缓凝剂具有较好的黏土耐受性，当磷酸基团比为2.6时，缓凝剂的抗黏土性能最好。
（4）吸附试验表明，加入磷酸基缓凝剂后能有效的降低蒙脱土对减水剂的吸附，增强减水剂的抗黏土性能，提高减水剂在劣质骨料混凝土中的分散性能。
参考文献
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引用本文
王兵,范士敏,亓帅,等.具有黏土耐受性缓凝剂的制备及在混凝土中的应用[J].混凝土与水泥制品,2019(8):5-7+18.
WANG B,FAN S M,QI S,et al.Synthesis of Phosphate Retarder with Anti-clay Ability and Its Application in Concrete[J].China Concrete and Cement Products,2019(8):5-7+18.
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