预湿再生粗骨料对自密实混凝土工作性能及力学性能影响的研究
Performance and Microstructure Analysis of Self-compacting Recycled Concrete
魏伟 1闫革 2贾保正 1汪嫦红 1王峥嵘 1程书凯3
作者信息
- 1. 武汉市汉阳市政建设集团有限公司,武汉 430050
- 2. 武汉市汉阳市政建设集团有限公司,武汉 430050;武汉钟鑫建设集团有限公司,武汉 430050
- 3. 武汉工程大学土木工程与建筑学院,武汉 430074
- 折叠
摘要
以3种不同的预湿率(50％、70％和100％)和不同掺量(15％、30％和50％)再生粗骨料制备自密实再生混凝土,并测试其工作性能和力学性能.结果表明,预湿可以增加自密实混凝土的工作性能,并且70％的预湿程度下工作性能最好;RCA在30％掺量的情况下,自密实再生混凝土的力学性能有所提高,非蒸发结晶水的研究结果也表明掺30％RCA的混凝土内部水化程度更高,合理解释了 RCA掺量在小于30％时混凝土具备更好的抗渗性,以及佐证了混凝土的强度变化趋势.
Abstract
Self-compacting recycled concrete was prepared with three different pre-wetting rates(50％,70％and 100％)and different contents(15％,30％and 50％)of recycled coarse aggregate,and workability performance and me-chanical properties were tested.The results show that pre-wetting can increase the workability performance of self-com-pacting concrete,and the workability performance is best at a pre-wetting rate of 70％;when RCA is added at a content of 30％,the mechanical properties of self-compacting recycled concrete are improved,and the research results of non-evapo-rable water also show that the internal hydration content of concrete with 30％RCA is higher,which reasonably explains that concrete has better impermeability when the RCA content is less than 30％,and confirms the strength change trend of concrete.
关键词
自密实再生混凝土/再生粗骨料/预湿率/工作性能/力学性能/非蒸发结晶水Key words
SCR AC/RCA/pre-wetting rates/workability/mechanical properties/non-evaporable water引用本文复制引用
基金项目
湖北省重点研发计划(2020BABO65)
武汉市重点研发项目(2022022202015022)
出版年
2024
NETL
NSTL
万方数据