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高强自密实混凝土的减缩措施研究
作者:阎培渝1 余成行2 王强1 张波1 
单位: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 
关键词:混凝土 自收缩 抗压强度 高吸水性树脂 减缩剂 
分类号:
出版年,卷(期):页码:2015,43(4):0-0
DOI:
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。研究结果显示,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,由于水分释放后留下的孔洞的直径主要为50~70 nm,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。

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 The effect of dosage of shrinkage-reducing admixture (SRA) and super adsorbent polymer (SAP) on the workability, compressive strength and volume stability of C70 self-compacting 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 self-compacting concrete. SAP has higher shrinkage -reducing efficiency and less negative influence on the workability of concrete rather than SRA. The beginning time of autogenous shrinkage of high strength concrete with SAP delays and the shrinkage amount in the first day decreases, which can improve the anti-cracking of concrete. SAP particles disperse uniformly in hardened concrete. The diameter of the pores in SAP particles formed by the release of water is mainly in a range of 50–70nm. The porosity of concrete with SAP increases gently, affecting slightly the compressive strength of concrete.

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基金项目:
基金项目:自然科学基金面上项目(51278277);教育部博士点基金项目(20130002110033)。
作者简介:
第一作者:阎培渝(1955—), 男,博士,教授。
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参考文献:

 参考文献:

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