柠檬酸对水泥浆体流动度的影响及作用机理  

Effect of Citric Acid on Fluidity of Cement Paste and Its Mechanism of Action

作　　者：夏国辉 毛永琳 张建纲 周栋梁 杨勇 XIA Guohui;MAO Yonglin;ZHANG Jiangang;ZHOU Dongliang;YANG Yong(State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Sobute New Materials Co.,Ltd,Nanjing Jiangsu 211108 China)

机构地区：[1]高性能土木工程材料国家重点实验室,江苏苏博特新材料股份有限公司,江苏南京211108

出　　处：《江苏建筑》2024年第4期133-136,共4页Jiangsu Construction

摘　　要：文章通过测试掺柠檬酸的水泥净浆流动度经时变化过程,发现柠檬酸使水泥浆体早期流动性下降,后期流动性保持能力提升。通过测试减水剂吸附、早期水化产物、浆体比表面积研究了柠檬酸影响水泥浆体流动性的作用机理。结果表明,柠檬酸削弱减水剂吸附,促进钙矾石的生成,是造成水泥净浆流动度降低的主要原因。It is found that citric acid decreases the early fluidity of cement paste and improves the later fluidity retention ability by testing the fluidity of cement paste mixed with citric acid.The effect mechanism of citric acid on the fluidity of cement paste was studied by testing the water reducer adsorption,early hydration products,and specific surface area.The results showed the main reason for the reduction of fluidity was that citric acid weakened the adsorption of water reducer on the surface of cement particles and promoted the formation of ettringite.

关 键 词：柠檬酸 净浆流动度 吸附 水化产物 

分 类 号：TU528.042.3[建筑科学—建筑技术科学]