摘要
为了研究氯盐环境下水泥基材料中Friedel’s盐的生成规律及其稳定性影响因素,通过改变试件水灰比和浸泡液氯化钠浓度、pH,采用X射线衍射、热分析、离子色谱测试Friedel’s盐含量变化,分析不同条件下Friedel’s盐的生成规律和氯离子浓度、pH对Friedel’s盐稳定性的影响。结果表明:大水灰比试件水化程度高,熟料中更多的C4AF水化提供铝相吸附氯离子生成Friedel’s盐。溶液环境pH≥12时,Friedel’s盐能稳定存在;pH增大到13.5时,水化产物中钙矾石溶解,导致生成更多的Friedel’s盐;环境溶液氯离子浓度降低时,Friedel’s盐将会溶解;提高溶液的pH能抑制Friedel’s盐溶解。
In order to study the formation law of Friedel’s salt in cement-based materials and its stability in chloride environment,by changing the water-cement ratio of specimen,the concentration of sodium chloride and the pH of the soaking solution,the change of Friedel’s salt content was tested by X-ray diffraction,thermal analysis,and ion chromatography.The formation of Friedel’s salt under different conditions,the effects of chloride ion concentration and pH on the stability of Friedel’s salt were analyzed.The results showed that:large water-cement ratio specimens had a higher degree of hydration,and more C4AF hydration in the clinker provided the aluminum phase to adsorb chloride ions to form Friedel’s salt.Friedel’s salt could exist stably at pH≥12;when the pH value increased to 13.5,the ettringite dissolved in the hydration products,leading to more Friedel’s salt formation.When the chloride concentration of the environmental solution decreased,Friedel’s salt dissolved,but increasing the pH value of the solution could inhibit the dissolution of Friedel’s salt.
作者
管学茂
张高隆
何富强
周瑾
GUAN Xuemao;ZHANG Gaolong;HE Fuqiang;ZHOU Jin(School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;School of Civil Engineering and Architecture,Xiamen University of Technology,Xiamen 361000,Fujian,China)
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2023年第5期176-182,共7页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(U1905216,51878583)。
