文档介绍：第43卷第4期2015年4月硅酸盐学报Vol. 43,No. 4 April,2015 JOURNAL OF THE CHINESE CERAMIC SOCIETY DOI:.0454- 高强自密实混凝土的减缩措施阎培渝1,余成行2,王强1,张波1(1. 清华大学土木工程系,北京100084;2. 北京中超混凝土有限公司,北京 100024) 摘要:观察了不同掺量的减缩剂和高吸水性树脂对于C70自密实混凝土的工作性、抗压强度和体积稳定性的影响;对含有高吸水性树脂的硬化混凝土的微观结构进行了分析,探讨高吸水性树脂降低混凝土自收缩的机理。结果显示,掺加减缩剂和高吸水性树脂都能降低自密实混凝土的自收缩;高吸水性树脂的减缩效果更好,对于混凝土工作性的影响很小;掺加适量高吸水性树脂使高强混凝土的自收缩开始发展时间延后,第一天内的收缩量降低,有利于提高混凝土的抗裂性能;在硬化混凝土中高吸水性树脂颗粒分散分布,水分释放后留下的孔洞的直径大多处于50~70nm范围内,并使混凝土的总孔隙率有所上升,但对其抗压强度的影响较小。关键词:混凝土;自收缩;抗压强度;高吸水性树脂;减缩剂中图分类号: 文献标志码:A 文章编号:0454–5648(2015)04–0363–05 网络出版时间:2015–04–01 16:15:07 网络出版地址:s/detail/ Shrinkage-reducing Measurement of High Strength pacting Concrete YAN Peiyu1, YU Chenghang2, WANG Qiang1, ZHANG Bo1(1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2. Beijing Zhongchao Concrete Co. Ltd., Beijing 100024, China) Abstract: The effect of dosage of shrinkage-reducing admixture (SRA) and super adsorbent polymer (SAP) on the workability, compressive strength and volume stability of C70 pacting concrete was investigated. The microstructure of hardened concrete containing SAP was analyzed to explain the shrinkage-reducing mechanism of SAP. The results show that SRA and SAP both can decrease the autogenous shrinkage of pacting concrete. SAP has h