（1 上海烟草集团有限责任公司， 上海 200082； 2 上海建科预应力技术工程有限公司， 上海 200032）

［摘要］通过采用补偿收缩混凝土无缝设计和施工新方法，可以实现超长混凝土结构取消后浇带或不设缝的目的，不但可有效缩短工期，且防水性能好,是解决超长混凝土结构裂渗问题的有效技术途径。通过混凝土坍落度试验、限制膨胀率试验以及抗压强度试验，研究了膨胀剂掺量对三种强度等级补偿收缩混凝土的坍落度以及各龄期限制膨胀率和抗压强度的影响。根据试验结果，得出各强度等级补偿收缩混凝土膨胀剂的最优掺量，优化了混凝土配合比以实现实际超长混凝土结构工程对补偿收缩混凝土各方面性能的要求。

［关键词］补偿收缩混凝土； 膨胀剂； 坍落度； 限制膨胀率； 抗压强度

中图分类号：TU528-55文献标识码：A文章编号：1002-848X(2016)13-0103-04

Mix proportion design and experimental study on shrinkage compensating concrete

Gu Zhengyu1, Zhang Defeng2, Feng Weimin1, Yang Yichao1

(1 Shanghai Tobacco Group Co., Ltd., Shanghai 200082, China; 2 Shanghai Jianke Prestress Engineering Co., Ltd., Shanghai 200032, China)

Abstract:By using shrinkage compensating concrete in seamless design and new construction method, the post casting belts or joints can be cancelled in super-long concrete structures. This method can not only effectively shorten construction period but also obtain good effects on waterproof property. Therefore, shrinkage compensating concrete is an effective technical way to solve the problem of cracks and infiltration in super-long concrete structures. The influences of amount of expansive agent on slump, limited expansion ratio and compressive strength of shrinkage compensating concrete with three strength grades and different ages were studied through slump test, limited expansion ratio test and compressive strength test. Based on the test results, the optimal amount of expansive agent in shrinkage compensating concrete was determined for each strength grade for concrete and the mix proportion of concrete was optimized, so that the performance requirements on shrinkage compensating concrete in practical super-long concrete structures could be met.

Keywords:shrinkage compensating concrete; expansive agent; slump; limited expansion ratio; compressive strength

*上海烟草集团有限责任公司科技项目（SZBCW201500462）。

作者简介: 顾征宇，本科，高级工程师，Email：guzy@sh.tobacco.com.cn。