纳米SiO_(2)协同酸预处理对碱激发钢渣-矿渣泛碱行为的影响研究  

Study on the Effect of Nano-Si0_(2) Synergistic Acid Pretreatment on the Alkali Efflorescence Behavior of Alkali-Activated Steel Slag-Slag

作　　者：蒋恬 柯国军 彭丽娟 王文青 JIANG Tian;KE Guojun;PENG Lijuan;WANG Wenqing

机构地区：[1]南华大学土木工程学院,湖南衡阳421001 [2]中国核建高性能混凝土实验室,湖南衡阳421001

出　　处：《重庆建筑》2024年第8期69-71,共3页Chongqing Architecture

基　　金：湖南省自然科学基金衡阳联合项目(项目编号:2019JJ60003)。

摘　　要：为了降低泛碱行为对碱激发钢渣-矿渣材料造成的影响,该文采用硫酸预处理钢渣协同不同掺量纳米二氧化硅的处理方式,研究在不同模数的碱性环境中,纳米SiO_(2)协同酸处理对碱激发钢渣-矿渣材料泛碱行为的影响,同时测定钢渣基复合材料的胶砂强度,采用扫描电子显微镜(SEM)、压汞测试(MIP)对复合体系进行机理分析。结果表明:硫酸预处理钢渣与纳米SiO_(2)对碱激发钢渣-矿渣材料的泛碱行为具有协同改善作用。当水玻璃模数为1时,硫酸预处理钢渣且掺入质量分数为2%的纳米SiO_(2),其微观结构平整,孔结构得到优化,抗压强度最高,泛碱行为得到最大程度改善。In order to reduce the impact of alkali efflorescence behavior on alkali-activated steel slag-slag materials,this paper adopts a pretreatment method combining sulfuric acid pretreatment of steel slag with different dosages of nano-silica dioxide.The study investigates the influence of nano-SiO_(2) synergistic acid pretreatment on the alkali efflorescence behavior of alkali-activated steel slagslag materials in alkaline environments with different moduli,while measuring the mortar strength of steel slag-based composite materials.Scanning electron microscopy(SEM)and mercury intrusion porosimetry(MIP)are used to analyze the mechanism of the composite system.The results indicate that sulfuric acid pretreatment of steel slag and nano-SiO_(2) have a synergistic effect on improving the alkali efflorescence behavior of alkali-activated steel slag-slag materials.When the modulus of water glass is 1,with sulfuric acid pretreatment of steel slag and the addition of 2%nano-SiO_(2) by mass fraction,the microstructure is smooth,the pore structure is optimized,the compressive strength is the highest,and the alkali efflorescence behavior is improved to the greatest extent.

关 键 词：纳米SiO_(2) 酸处理 钢渣 泛碱行为 

分 类 号：TU501[建筑科学—建筑技术科学]