机制砂对混凝土拌和物含气特性影响规律研究  

The Influence of the Manufactured Sand on the Air Content Characteristics of Concrete Mixture

作　　者：闵永涛 贺晶晶 胡炜[1] 赵坤龙 樊李浩 MIN Yong-tao;HE Jing-jing;HU Wei;ZHAO Kun-long;FAN Li-hao(Power China Northwest Engineering Corporation Limited,Xi′an 710065,Shaanxi Province,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《中国农村水利水电》2023年第3期218-222,共5页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目(5207090694);陕西省自然科学基础研究计划资助项目(2021JQ-983)。

摘　　要：针对不同砂率、石粉含量、细度模数、颗粒级配的混凝土拌和物含气量展开试验研究,分析了机制砂对混凝土拌和物含气特性的影响规律。研究结果表明:混凝土拌和物含气量随砂率在一定范围成递增关系,随石粉含量、细度模数增大成递减关系;0.15~0.3 mm粒径范围的颗粒含量减少时,混凝土的含气量明显降低,0.3~0.6 mm粒径范围的颗粒含量增大时,混凝土的含气量显著增加,0.6~1.18 mm粒径范围的颗粒含量对含气量影响较小。研究结论可为机制砂混凝土配合比提供参考依据。The air content of concrete mixture with different sand ratio,stone powder content,fineness modulus and particle gradation are experimentally studied.And the influence of the manufactured sand on the air content characteristics of concrete mixture is analyzed.The results show that the air content of concrete mixture increases with the sand rate in a certain range,and decreases with the increase in stone powder content and fineness modulus.When the particle content in the range of 0.15~0.3 mm mm particle size decreases,the air content of concrete mixture decreases significantly.While the air content of concrete increases significantly when the 0.3~0.6 mm particle content increases.The particle content in the range of 0.6~1.18 mm has little effect on the gas content.The research conclusion can provide a reference for the mix proportion of machine-made sand concrete.

关 键 词：机制砂 砂率 细度模数 石粉 颗粒级配 混凝土含气量 

分 类 号：TV431[水利工程—水工结构工程]