水工混凝土掺合料特性及石灰石粉水化机理研究  

Study on characteristics of hydraulic concrete admixture and hydration mechanism of limestone powder

作　　者：张正 孔祥芝[2,3] 马涛 吴葵 张会梅 马晓旭 ZHANG Zheng(Ningxia Water Conservancy and Hydropower Engineering Bureau Co.LTD.,Yinchuan 750001,Ningxia,China)

机构地区：[1]宁夏水利水电工程局有限公司,宁夏银川750001 [2]中国水利水电科学研究院,北京中水科海利工程技术有限公司,北京100038 [3]水利部水工程材料重点实验室(筹),北京100038

出　　处：《水泥》2024年第6期10-13,共4页Cement

基　　金：十三五国家重点研发计划(2018YFC0406701);国家自然基金项目(51879286);宁夏水利水电工程局有限公司科研项目(2021110032014994);新疆额尔齐斯河投资开发(集团)有限公司科研项目(EQ098/FY079,QBT067/FY28)。

摘　　要：利用扫描电镜、X射线衍射、压汞等材料分析手段,系统研究了石灰石粉、粉煤灰、磨细矿渣三种水工混凝土常用掺合料的矿物组成、表面特性,以及二元、三元胶凝材料体系的水化机理。结果表明,石灰石粉颗粒表面粗糙,促进水泥早期水化,微弱参与反应并生成水化碳铝酸钙,但不具有火山灰活性,石粉对水泥石中孔径在20~100 nm范围的孔隙影响较大,提高石粉掺量,该范围的孔隙增多,硬化浆体孔结构变差。粉煤灰中含有大量的球形颗粒,颗粒表面致密光滑,含有大量玻璃体,将粉煤灰与石粉复合双掺,粉煤灰的火山灰效应能够优化浆体孔结构。By using scanning electron microscopy,X-ray diffraction,mercury intrusion and other testing methods,the mineral composition and surface characteristics of three admixtures(limestone powder,fly ash,and ground granulated blast furnace slag)commonly used in hydraulic concrete were studied,and the hydration mechanism of binary and ternary cementitious material systems was studied.The results showed that the surface of limestone powder particles was rough,which could promote the early hydration of cement,weakly participate in the reaction and generate hydrated carbon calcium aluminates,but it had no volcanic ash activity.The limestone powder has a greater impact on the pores in the range of 20~100 nm in cement stone.As the content of limestone powder increases,the pores in this range increase and the pore structure of hardened paste gets worse.Fly ash contains a large number of spherical particles,the surface of the particles is dense and smooth,and it contains a large number of vitreous bodies.The pozzolanic effect of fly ash can optimize the pore structure of slurry by combining fly ash with limestone powder.

关 键 词：石灰石粉 粉煤灰 磨细矿渣 掺合料 大坝混凝土 

分 类 号：TU528.041[建筑科学—建筑技术科学]