煤矸石粉制备混凝土用复合掺合料的性能研究
Study on the Properties of Composite Admixture for Concrete Prepared by Partially Substituting Coal Gangue for Fly Ash
王建华 1赖益梁 1刘刚 1杨枫 2刘建新 1李广生1
作者信息
- 1. 华东勘测设计院 (福建) 有限公司, 福建福州 361005
- 2. 福建理工大学土木工程学院, 福建福州 350108
- 折叠
摘要
用煤矸石粉部分替代粉煤灰制备混凝土用复合矿物掺合料,通过正交实验研究煤矸石粉、粉煤灰、磷渣掺量对受检胶砂抗折强度、抗压强度、活性指数和抗压强度增长比的影响.结果表明:由于火山灰效应和微集料效应,煤矸石粉、粉煤灰、磷渣对水泥的水化存在较强相互作用,设计配合比适宜时,受检胶砂的 7 和28d活性指数及强度增长比均达到普通Ⅲ级复合矿物掺合料指标要求,表明用煤矸石粉部分替代粉煤灰制备混凝土用复合矿物掺合料完全可行,最优方案为煤矸石粉掺量 25.0%、粉煤灰掺量 62.5%、磷渣掺量 12.5%.
Abstract
The composite mineral admixtures for concrete were prepared by partially replacing fly ash with coal gangue powder.The effects of coal gangue powder,fly ash and phosphorus slag on the flexural strength,compressive strength,activity index and strength growth ratio of the tested mortar were studied through orthogonal experiments.The results showed that there was a strong interaction between gangue powder,fly ash and phosphorus residue on the hydration of cement,and when the design mix ratio is appropriate,the 7-day and 28-day activity index and strength growth ratio of the tested gum sand reached the requirements of the ordinary grade Ⅲ composite mineral admixture of composite admixture for concrete,indicating that it was completely feasible to prepare composite mineral admixture for concrete by replacing fly ash with gangue powder,and the optimal scheme is to add 25.0% coal gangue powder,62.5% fly ash,and 12.5% phosphorus slag.
关键词
煤矸石粉/粉煤灰/复合掺合料/混凝土/磷渣/性能Key words
gangue powder/fly ash/composite admixtures/concrete/phosphorus residue/property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据