粉煤灰和矿渣复合掺料对高性能混凝土力学性能和耐久性的影响  

Effect of Fly Ash and Slag Composite Admixture on Mechanical Properties and Durability of High Performance Concrete

作　　者：王金歌 Wang Jinge(Guangdong Technology College,Zhaoqing,China)

机构地区：[1]广东理工学院,广东肇庆

出　　处：《科学技术创新》2024年第11期185-188,共4页Scientific and Technological Innovation

基　　金：广东省教育厅2021年“广东省本科高校教学质量与教学改革工程建设项目”《集成房屋制造科产教融合实践教学基地》(KCJJD202101)。

摘　　要：本文探究了由粉煤灰和矿渣组成的复合掺料,对高性能混凝土力学性能与耐久性的影响。在试验中,制作了0.47、0.30、0.25三种水灰比的混凝土试件,每种试件下改变复合掺料中粉煤灰与矿渣的比例,验证复合掺料与混凝土抗压强度及干缩率的关系。试验表明,在水灰比较小时,掺入复合掺料代替一部分水泥,可以提高混凝土的后期抗压强度,降低其干缩率;在复合掺料中,当粉煤灰的掺量一定时,矿渣的掺量越多,混凝土的力学性能和耐久性越好。由此可得,在保证混凝土配合比设计合理的前提下,适当掺入粉煤灰和矿渣,减少水泥的用量,能改善混凝土的力学性能,并延长其使用寿命。In this paper,the effects of composite admixtures composed of fly ash and slag on the mechanical properties and durability of high performance concrete were investigated.In the test,three kinds of concrete samples with water-cement ratio of 0.47,0.30 and 0.25 were made,and the ratio of fly ash and slag in the composite admixture was changed under each sample to verify the relationship between the compressive strength and dry shrinkage of the composite admixture.The results show that when the water-cement ratio is small,the late compressive strength of concrete can be improved and its dry shrinkage can be reduced by adding composite admixture instead of some cement.In the composite admixture,when the content of fly ash is constant,the more the content of slag,the better the mechanical properties and durability of concrete.It can be concluded that the mechanical properties of concrete can be improved and its service life can be prolonged by proper incorporation of fly ash and slag and reducing the amount of cement under the premise of reasonable design of concrete mix ratio.

关 键 词：粉煤灰 复合掺料 高性能混凝 抗压强度 干缩率 

分 类 号：TU528[建筑科学—建筑技术科学]