杂质离子对水化硅(铝)酸钙微纳结构的影响  

Effect of Impurity Ions on Micro-/Nano-Structure of Calcium Silicate(Aluminate)Hydrate

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作  者:徐玲琳[1] 孙子璇 陈钰婷 朱哲誉 吴凯[1] XU Linglin;SUN Zixuan;CHEN Yuting;ZHU Zheyu;WU Kai(Key Laboratory of Advanced Civil Engineering Materials,Ministry of Education,School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,Jiangsu,China)

机构地区:[1]先进土木工程材料教育部重点实验室,同济大学材料科学与工程学院,上海201804 [2]盐城工学院材料科学与工程学院,江苏盐城224051

出  处:《硅酸盐学报》2025年第1期212-224,共13页Journal of The Chinese Ceramic Society

基  金:国家重点研发计划专项(2022YFC3803404);国家自然科学基金(52378255,52278270,52302030)。

摘  要:作为硅酸盐水泥最主要的水化产物,水化硅(铝)酸钙[C-(A-)S-H]及其在杂质离子作用下的微纳结构演变决定了水泥基材料的各项性能。近年来,在大量先进表征技术、计算机模拟以及机器学习技术加成下,C-(A-)S-H微纳结构模型发展迅速。随着对C-(A-)S-H微纳结构认识的不断深入,杂质离子作用下C-(A-)S-H微纳结构演变规律逐渐清晰。本文总结了C-(A-)S-H的微纳结构表征、微纳结构模型发展、杂质离子作用对其微纳结构的影响机制和面向海洋服役环境的硅酸盐水泥基材料延寿策略,分析了当前研究进展及未来发展方向,旨在为硅酸盐水泥基材料的性能精准调控提供理论借鉴。Calcium silicate(aluminate)hydrate(C-(A-)S-H)as a predominant hydration product formed in Portland cementitious materials plays a pivotal role in determining the mechanical strength,durability,and creep resistance of Portland cementitious materials.The complex and intricate micro-/nano-structures of C-(A-)S-H become a challenge in deciphering its characteristics of micro-/nano-structures.Furthermore,the sensitivity of C-(A-)S-H to service environments exacerbates the complexity of micro-/nano-structures analysis.Throughout the operational lifespan of Portland cementitious materials,fluctuations in temperature,mechanical stresses,water flow dynamics,and attack of ions(i.e.,Na^(+),Mg^(2+),Cl^(-)and SO_(4)^(2–))lead to continuous and dynamic changes in the micro-/nano-structures of C-(A-)S-H.Recent work on the methods for characterizing C-(A-)S-H micro-/nano-structures,computational simulations of C-(A-)S-H,and the integration of machine learning techniques are carried out to clarify the micro-/nano-structures of C-(A-)S-H.These advancements facilitate iterative improvements in micro-/nano-structure models,enabling more precise predictions and control of macroscopic properties in micro-/nano-scale in Portland cementitious materials,accurately forecasting the evolution of C-(A-)S-H micro-/nano-structures under ions attack conditions,having a significant promise for further refining micro-/nano-structure models.Such advancements can provide theoretical insights and offer practical avenues and strategies for optimizing the performance and durability of Portland cementitious materials through informed materials design and engineering strategies.It is necessary to explore the advanced characterization of C-(A-)S-H micro-/nano-structures and clarify the intricate development of models depicting micro-/nano-structures of C-(A-)S-H,micro-/nano-structures evolution under ions attack environments and the specific mechanisms by ions(i.e.,Na^(+),Mg^(2+),Cl^(-)and SO_(4)^(2–))interact.A C-(A-)S-H micro-/nano-structure model

关 键 词:水化硅(铝)酸钙 杂质离子 微纳结构 耐久性 

分 类 号:TU528[建筑科学—建筑技术科学]

 

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