摘要
为研究硅灰对混凝土工作性能、力学性能、干缩性能的影响,本文在不同水胶比下,探究了硅灰掺量对混凝土的流动性、抗压强度、劈裂抗拉强度和干缩率的影响。结果表明:两种水胶比下,混凝土的流动性均随硅灰掺量的增加逐渐下降,其中水胶比0.45组对其流动性影响更显著;硅灰的掺入对不同水胶比混凝土的抗压和劈裂抗拉强度均有提升,其中,相较于基准组,水胶比为0.45、0.60时,10%硅灰掺量28d抗压和劈裂抗拉强度分别提高了18.1%和14.8%、21.2%和20.4%;随着硅灰掺量的增加,两种水胶比下混凝土的干缩率均在增加,相较于水胶比0.45组,水胶比0.60时混凝土的干缩率更高,在90 d干燥收缩率最高,较基准组分别增加了29.5%和25.1%。研究成果可为高性能硅灰混凝土的优化设计提供参考。
To study the influence of silica fume on the workability,mechanical properties and dry shrinkage of concrete,we investigated the effects of silica fume dosage on the fluidity,compressive strength,splitting tensile strength and dry shrinkage rate of concrete under different water-binder ratios.The research results show that the fluidity of concrete decreases gradually with the increase of silica fume dosage under both water-binder ratios,and the effect is more significant in the water-binder ratio of 0.45 group.The incorporation of silica fume enhances the compressive and splitting tensile strength of concrete with different water-binder ratios.Specifically,compared with the reference group,when the water-binder ratio is 0.45,the 28 days compressive and splitting tensile strength with 10%silica fume dosage increase by 18.1%and 14.8%,21.2%and 20.4%respectively.With the increase of silica fume dosage,the dry shrinkage rate of concrete under both water-binder ratios increases.Compared with the water-binder ratio of 0.45 group,the dry shrinkage rate of concrete is higher when the water-binder ratio is 0.60.The highest drying shrinkage rate was observed at 90 days,with an increase of 29.5%and 25.1%compared to the baseline group,respectively.Provide a reference for the optimized design of high-performance silica fume concrete.
作者
翁娅莲
孙海燕
梁荣创
高愈昌
WENG Yalian;SUN Haiyan;LIANG Rongchuang;GAO Yuchang(College of Water Conservancy,Yunnan Agricultural University,Kunming 650201,China)
出处
《粉煤灰综合利用》
2025年第4期24-28,129,共6页
Fly Ash Comprehensive Utilization
基金
云南省教育厅科学研究基金项目(2024J0446)。
关键词
硅灰
掺量
水胶比
力学性能
干燥收缩
silica fume
dosage
water binder ratio
mechanical properties
drying shrinkage
作者简介
翁娅莲(1999-),女,硕士研究生,研究方向:水工材料;通信作者:孙海燕(1979-),女,博士,副教授,硕士生导师,研究方向:水工材料。
