硅酸盐通报2025，Vol.44Issue(5)：1676-1688,13.DOI:10.16552/j.cnki.issn1001-1625.2024.1563
外加剂掺量对煤矸石喷射混凝土力学性能和抗渗性的影响
Influence of Admixture Dosage on Mechanical Properties and Impermeability of Coal Gangue Shotcrete
摘要
Abstract
Coal gangue shotcrete(CGS),as an eco-friendly construction material,is significantly influenced by the type and amount of admixtures used,among which accelerators and superplasticizers are widely applied due to their effective modification properties.This paper investigated the impact of varying dosages of accelerators and superplasticizers on the mechanical properties and impermeability of CGS through single-factor experiments to determine the optimal dosage.The findings were validated through rebound rate and large plate spraying tests.The results show that the inclusion of superplasticizer causes the compressive strength and splitting tensile strength of CGS to initially increase,then decrease,and rise again,achieving optimum properties at a 2.50％(mass fraction)dosage with no signs of permeability and good compactness.For accelerator content ranging from 0％ to 3％,there is a slight increase in compressive and splitting tensile strength at 1 d age,which gradually decreases at 7 and 28 d.When the dosage increases from 3％to 12％(mass fraction),the strengths significantly decrease at all tested ages.Excessive accelerator(12％)notably exacerbates permeability.When the accelerator dosage is 3％,the top of CGS shows permeability.Rebound tests demonstrate that the synergistic effect of the accelerator and superplasticier enhances the flowability and bonding of CGS,reducing the rebound rate to 13.03％.The large plate spraying tests indicate that the optimized mix of CGS significantly enhances compressive strength and splitting tensile strength compared to ordinary CGS,with a 50.72％ reduction in average penetration height.关键词
煤矸石/喷射混凝土/外加剂/力学性能/抗渗性Key words
coal gangue/shotcrete/admixture/mechanical property/impermeability分类
建筑与水利引用本文复制引用
查文华,蔡雨凯,许涛,钱育冬..外加剂掺量对煤矸石喷射混凝土力学性能和抗渗性的影响[J].硅酸盐通报,2025,44(5):1676-1688,13.基金项目
江西省2024研究生创新基金项目(YC2024—S473) （YC2024—S473）
