管学茂, 张高隆, 何富强,等.氯盐环境下水泥基材料中Friedel’s盐的生成规律与稳定性研究[J].河南理工大学学报（自然科学版）,2023,42(5):176-182.

GUAN X M, ZHANG G L, HE F Q, et al.Study on the formation and stability of Friedel’s salt in cement-based materials in chloride environment[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(5):176-182.

氯盐环境下水泥基材料中Friedel’s盐的生成规律与稳定性研究

管学茂1, 张高隆1, 何富强2, 周瑾2

1.河南理工大学 材料科学与工程学院，河南 焦作  454000;2.厦门理工学院 土木工程与建筑学院，福建 厦门  361000

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。

关键词:水泥基材料;Friedel’s盐;氯离子浓度;Friedel’s盐稳定性;pH

doi:10.16186/j.cnki.1673-9787.2022010068

基金项目:国家自然科学基金资助项目（U1905216，51878583）

收稿日期:2022/01/22

修回日期:2022/05/09

出版日期:2023/09/25

Study on the formation and stability of Friedel’s salt in cement-based materials in chloride environment

GUAN Xuemao1, ZHANG Gaolong1, HE Fuqiang2, ZHOU Jin2

1.School of Materials Science and Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.School of Civil Engineering and Architecture，Xiamen University of Technology，Xiamen  361000，Fujian，China

Abstract: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.

Key words:cement-based material;Friedel’s salt;chloride ion concentration;Friedel’s salt stability;pH

氯盐环境下水泥基材料中Fr...s盐的生成规律与稳定性研究_管学茂.pdf