摘要
钢渣水化活性差,体积安定性不良限制了其作为辅助性胶凝材料的应用,但钢渣具有很好的碳酸化活性。本文在对钢渣进行预处理的过程中通过调整CO_(2)浓度及碳酸化时间,调控钢渣的碳酸化程度,分析了碳酸化对钢渣微观结构及固碳效果的影响,同时评价了碳酸化钢渣作为辅助性胶凝材料的可行性。结果表明:含30%(质量分数)钢渣的水泥砂浆试块3、28 d抗压强度较未掺钢渣水泥砂浆分别降低了43.2%和30.0%,净浆试块经压蒸试验后由于膨胀过大而溃散;CO_(2)浓度对钢渣的固碳量有显著的影响,高浓度(体积分数为99.9%)CO_(2)进行碳化养护3 min时钢渣固碳量就达到了3.67%。钢渣的体积安定性与碳酸化程度呈正相关,而过度碳酸化处理会降低其水化活性,掺加30%(质量分数)碳酸化预处理3、10 min钢渣的砂浆3 d抗压强度较掺加30%原始钢渣的砂浆分别提高了28.3%和15.8%。
The application of steel slag as supplementary cementitious materials is limited by its poor hydration activity and volume stability,while steel slag shows excellent carbonation activity.In this paper,the carbonation degree of steel slag was controlled by adjusting the CO_(2) concentration and carbonation time.The effect of carbonation on the microstructure and CO_(2) uptake of steel slag was analyzed,and the volume stability and hydration activity of carbonated steel slag used as supplementary cementitious materials were evaluated.The results show that the 3,28 d compressive strength of mortar containing 30%(mass fraction)steel slag reduce by 43.2%and 30.0%,respectively,compared to the mortar without steel slag.And paste specimen collapses due to expansion after autoclaving experiment.The CO_(2) uptake of steel slag is significantly affected by the concentration of CO_(2).The CO_(2) uptake of steel slag arrives at 3.67%after carbonation for 3 min at high concentration(volume fraction is 99.9%)of CO_(2).The volume stability of steel slag is positively correlated with the degree of carbonation,while over carbonation treatment reduces the hydration activity.The 3 d compressive strength of mortar containing 30%(mass fraction)steel slag carbonated for 3,10 min increases by 28.3%and 15.8%,respectively.
作者
房延凤
王凇宁
佟钰
孙小巍
丁向群
苏文
FANG Yanfeng;WANG Songning;TONG Yu;SUN Xiaowei;DING Xiangqun;SU Wen(School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang 110168,China;China Construction Civil Engineering Co.,Ltd.,Beijing 100070,China)
出处
《硅酸盐通报》
CAS
北大核心
2023年第3期1001-1007,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金青年科学基金项目(51808354)
中国博士后科学基金资助项目(2018M641712)
辽宁省教育厅科学研究经费项目(lnjc202017)。
关键词
钢渣
碳酸化
复合胶凝材料
水化活性
体积安定性
抗压强度
steel slag
carbonation
composite cementitious material
hydration activity
volume stability
compressive strength
