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超缓释型聚羧酸减水剂在不同类型混凝土中的应
作者：车文秀1，李晓宁2，李婷2，范德科2，朱玉雪2
（1.北京市昌平一建建筑有限责任公司，北京 102200；2.中建材中岩科技有限公司，北京 100024）
摘要：采用异丁烯醇聚乙烯醚（HPEG）、丙烯酸、不饱和酯等，在双氧水-VC引发体系下，常温制备了一种超缓释型聚羧酸系减水剂（SR-1）。在低坍落度混凝土、机制砂混凝土及高流态混凝土中的应用结果表明，SR-1具有优异的缓释性能和良好的适应性，可改善低坍落度混凝土的保坍、减少高含泥/含粉量混凝土的坍损并实现高远程泵送混凝土的长时保坍。此外，SR-1对混凝土凝结时间和强度无不利影响。
关键词：超缓释；聚羧酸减水剂；混凝土
中图分类号：TU528.042.2 文献标识码：A 文章编号：1001-702X（2017）09-0071-03
Application of ultra retarded-releasing polycarboxylate superplasticizer in different concretes
CHE Wenxiu1，LI Xiaoning2，LI Ting2，FAN Deke2，ZHU Yuxue2
（1.Beijing Changping Yijian Construction Co. Ltd.，Beijing 102200，China；
2.CNBM Zhongyan Technology Co. Ltd.，Beijing 100024，China）
CHE Wenxiu1，LI Xiaoning2，LI Ting2，FAN Deke2，ZHU Yuxue2
（1.Beijing Changping Yijian Construction Co. Ltd.，Beijing 102200，China；
2.CNBM Zhongyan Technology Co. Ltd.，Beijing 100024，China）
Abstract：In this paper，a novel ultra retarded-releasing polycarboxylate superplasticizer was prepared by the hydrogen peroxide-VC initiator system at room temperature using polyisobutylene alcohol（HPEG），acrylic acid，acrylamide（AM） and unsaturated ester，named SR-1. The application results in low-slump concrete，machine-made sand concrete and high-fluid concrete show that SR-1 has excellent sustained-release properties and good adaptability，which can effectively solve the slump retention of the low-slump concrete，reduce the slump loss of high powder content of concrete and ensure long-distance pumping concrete long-term retention. In addition，SR-1 has no adverse effect on the setting time and strength of concrete.
Key words：ultra retarded-releasing，polycarboxylate superplasticizer，concrete
Key words：ultra retarded-releasing，polycarboxylate superplasticizer，concrete