稻壳灰在充填体强度发展中的贡献机理
Mechanism development of strength contributed by CPB with rice husk ash
张钦礼 1刘宾 1冯岩 1郭力 2王道林 1朱敏 3张雁峰 4陈秋松1
作者信息
- 1. School of Resources and Safety Engineering,Central South University,Changsha 410083,China
- 2. College of Civil Engineering,Tongji University,Shanghai 200000,China
- 3. Hunan Baoshan Nonferrous Metals&Minerals Co.,Ltd.,Chenzhou 424402,China
- 4. Zijin(Xiamen)Engineering Co.,Ltd.,Xiamen 361009,China
- 折叠
摘要
因稻壳灰含有极高含量的非定形二氧化硅,目前常被研究人员用做水泥基建筑材料中的辅助胶凝材料.首先,本文以灰砂比、质量浓度以及稻壳灰的添加量为变量,分析稻壳灰含量对充填体力学特性的影响.然后,利用电镜扫描分析稻壳灰含量对充填体的微观结构的影响.最后,通过计算火山灰活性指数和火山灰强度贡献率来分析稻壳灰含量在充填体强度发展中的贡献机理.结果表明,提高稻壳灰含量可以有效增强充填体的相关力学特性.此外,充填体早期强度贡献来源于稻壳灰的填充效应,而影响充填体长期强度的主要因素为火山灰效应.
Abstract
Rice husk ash(RHA)is currently utilized as a supplementary cementitious material in cement products due to its pozzolanic properties.This study aims to investigate the pozzolanic effect(PE)and filler effect(FE)of RHA on the mechanical properties and microstructure of cemented paste backfill(CPB).The effects of RHA content,cement-to-tailings ratio,and mass concentration on the unconfined compressive strength(UCS)of the CPB were investigated.The proportion of UCS that could be attributed to the PE was 67.30%-87.92%higher than the FE in CPB with RHA contents ranging from 10%to 20%.The FE of RHA exerted stronger influence at lower curing times,but the PE played more crucial roles at curing times of more than 3 d.These results provide new insights into the potential use of RHA as a cementitious material for use in backfilling during mining operations.
关键词
充填体/稻壳灰/无侧限抗压强度/火山灰效应/填充效应Key words
cemented paste backfill/rice husk ash/unconfined compressive strength/pozzolanic effect/filler effect引用本文复制引用
基金项目
国家自然科学基金(52274151)
国家自然科学基金(552104156)
国家自然科学基金(52074351)
国家自然科学基金(52204166)
Science and Technology Innovation Program of Hunan Province,China(2021RC3125)
出版年
2024
NETL
NSTL
万方数据