碳化低热水泥混凝土孔隙溶液组成及碱度研究  

Study on Pore Solution Composition and pH of Carbonated Low-heat Cement Concrete

作　　者：薛豪 王振地 

机构地区：[1]中国建筑材料科学研究总院有限公司,北京100024

出　　处：《混凝土世界》2024年第7期28-31,共4页China Concrete

基　　金：“十四五”国家重点研发计划青年科学家项目(2022YFB3708701);绿色建筑材料国家重点实验室自立项目(ZA-66)。

摘　　要：本文通过压滤法制备了混凝土孔隙溶液,使用电感耦合等离子体光谱仪(ICP)和pH计分别测定低热水泥混凝土孔隙溶液的离子浓度和pH值,揭示了碳化前后低热水泥混凝土孔隙溶液的离子浓度和pH值的差异。结果表明:混凝土孔隙溶液中的元素Ca、K、Na、S在碳化前后均有改变,而Al、Fe、Si这3种元素并无变化;经碳化后,低热水泥混凝土孔隙溶液中元素Ca下降率为84%,高于硅酸盐水泥混凝土的78%;低热水泥混凝土孔隙溶液的pH值小于硅酸盐水泥混凝土,经碳化后,硅酸盐水泥混凝土孔隙溶液的pH值下降率为10%,低于低热水泥混凝土的14%。This paper prepares a concrete pore solution using a pressure filtration method,and measures the ion concentration and pH value of the low-heat cement concrete pore solution using an inductively coupled plasma spectrometer(ICP)and pH meter,respectively;reveales the differences in ion concentration and pH value of the low-heat cement concrete pore solution before and after carbonization.The results shows that the elements Ca,K,Na,and S in the pore solution of concrete changed before and after carbonization,while the three elements Al,Fe,and Si remained unchanged;after carbonization,the decrease rate of element Ca in the pore solution of low-heat cement concrete is 84%,which is higher than 78%of Portland cement concrete;the pH value of the pore solution in low-heat cement concrete is lower than that of Portland cement concrete.After carbonization,the pH value of the pore solution in Portland cement concrete decreases by 10%,which is lower than 14%of low-heat cement concrete.

关 键 词：混凝土孔隙溶液 PH值 压滤法 碳化 低热水泥混凝土 

分 类 号：TU528[建筑科学—建筑技术科学]