| 摘要: |
| 研究了掺和料和聚羧酸减水剂对C30高性能混凝土0~24h收缩规律的影响.结果表明：未掺减水剂时，掺和料对C30高性能混凝土的收缩有一定的影响.纯水泥混凝土、单掺粉煤灰混凝土、单掺矿渣混凝土、复掺粉煤灰和矿渣混凝土的收缩规律一致；24h内，4种混凝土的最大收缩值为1000×10-6～1500×10-6；矿渣的掺入对混凝土的收缩影响最小，复掺粉煤灰和矿渣混凝土的收缩率最大.掺入聚羧酸减水剂后4种混凝土的最大收缩率为1000×10-6～2500×10-6，且随掺和料掺配方式的不同而变化；掺入聚羧酸减水剂后，纯水泥混凝土和单掺矿渣混凝土24h内的收缩率分别为原来的2.4，2.0倍，且两者的收缩过程延长；单掺粉煤灰混凝土24h内的收缩率基本不变，复掺粉煤灰和矿渣混凝土的收缩率降低，且其到达最大收缩率的时间延长. |
| 关键词: 掺和料 聚羧酸减水剂 C30高性能混凝土 早期 收缩规律 |
| DOI：10.3969/j.issn.1007 9629.2017.01.016 |
| 分类号: |
| 基金项目:“十三五”国家重点研发计划项目（2016YFC0701003） |
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| Effect of Mineral Admixtures and Polycarboxylate Superplasticizer on Shrinkage Law of C30 High Performance Concrete at Ages of 024h |
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LIU Sifeng1, WANG Peiming1, ZHANG Lin2
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1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China;2.Zhejiang Tianda Environmental Protection Co., Ltd., Hangzhou 310007, China
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| Abstract: |
| Effects of mineral admixtures and polycarboxylate superplasticizer(PCE)on shrinkage law of C30 high performance concrete(HPC) at ages of 024 h were investigated. The mineral admixtures had a certain effect on the shrinkage of C30 HPC without PCE. The shrinkage ratio of pure cement HPC, fly ash(FA) HPC, ground granulated blast furnace slag（GGBS） HPC, HPC with FA and GGBS (ternary HPC) showed the same trend. The maximum shrinkage ratio for the four kinds of HPC was 1000×10-61500×10-6. The shrinkage ratio of GGBS HPC was the smallest, while that of ternary HPC is the largest. The maximum shrinkage ratio for the four kinds of HPC with PCE became 1000×10-62 500×10-6at ages of 024 h, which changed with the mix proportion of mineral admixtures. The shrinkage ratios of pure cement HPC and GGBS HPC with PCE were 2.4 and 2.0 times those of HPC without PCE, and the shrinkage process was postponed. The shrinkage ratio of FA HPC was not changed. The shrinkage ratio of the ternary HPC with PCE was reduced, and the time to the maximum shrinkage was shortened. |
| Key words: mineral admixture polycarboxylate superplasticizer(PCE) C30 high performance concrete early age shrinkage law |
