西南交通大学学报2024，Vol.59Issue(5)：1113-1122,10.DOI:10.3969/j.issn.0258-2724.20230036
粉煤灰和硅灰取代率对碱矿渣混凝土力学性能影响分析
Effect of Fly Ash and Silica Fume Contents on Mechanical Properties of Alkali-Activated Slag-Based Concrete
摘要
Abstract
In order to study the effect of fly ash and silica fume contents on the properties of alkali-activated slag-based concrete(AASC),the changes in setting time,cubic compressive strength,cubic splitting tensile strength,flexural strength,and elastic modulus of AASC were investigated by conducting tests on setting time and basic mechanical properties.Based on the test results,a regression analysis method was used to establish the conversion relationship equation of cubic splitting tensile strength,flexural strength,and elastic modulus with cubic compressive strength,and the effect of fly ash and silica fume on the properties of AASC was revealed according to the microstructure and phase composition.The results show that the fly ash and silica fume can prolong the setting time of AASC;the mechanical property indicators of AASC tend to strengthen and then weaken with the increase in the contents of fly ash and silica fume,and the optimal contents of fly ash and silica fume are 20%and 10%,respectively.The proposed empirical formulae for cubic splitting tensile strength,flexural strength,and elastic modulus of AASC have a high fitting precision.The appropriate contents of fly ash(silica fume≤20%)and silica fume(silica fume≤10%)can promote the hydration reaction of AASC and the denser microstructures.关键词
碱激发矿渣混凝土/粉煤灰/硅灰/力学性能/微观结构Key words
alkali-activated slag-based concrete/fly ash/silica fume/mechanical property/microstructures分类
土木建筑引用本文复制引用
夏冬桃,吴晨,崔凯,吴方红,李彪,王煜,喻诗汀,李耀威..粉煤灰和硅灰取代率对碱矿渣混凝土力学性能影响分析[J].西南交通大学学报,2024,59(5):1113-1122,10.基金项目
国家自然科学基金项目(52208152,52308248) 湖北工业大学科研项目(XJ202200401)和湖北工业大学2022年度研究生科研创新基金项目对本研究工作的支持. （52208152,52308248）
