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本网讯 近期，先进土木工程材料科研团队杨军博士联合武汉理工大学，在混凝土材料水化产物组成和C-A-S-H凝胶微结构研究领域取得新成果，在国际知名建筑材料期刊《Construction and Building Materials》（中科院1区，影响因子7.693）上发表了题为“Effect of Sulfate Attack on The Composition and Micro-mechanical Properties of C-A-S-H Gel in Cement-slag Paste: A Combined Study of Nanoindentation and SEM-EDS”的研究论文（https://doi.org/10.1016/j.conbuildmat.2022.128275）， 杨军博士为第一作者，武汉理工大学产学研首席教授/安徽建筑大学讲席教授丁庆军和威廉希尔官网：张高展教授为共同通讯作者。
此科研成果采用纳米压痕测试结合SEM-EDS方法，研究了外界硫酸盐侵蚀条件混凝土材料中C-(A-)S-H的力学纳米结构转变规律和性能劣化机理，提出硫酸盐侵蚀引起的C-A-S-H凝胶脱钙脱铝过程中孔隙率增加是其微观力学性能下降的原因，研究成果丰富了对于严酷环境下硫酸盐侵蚀C-(A-)S-H凝胶微结构和性能演变机理的认识。
Fig. Schematic illustration of the nanostructure deterioration in C-A-S-H induced by sulfate attack
这也是杨军博士联合青岛理工大学侯东帅教授在《Construction and Building Materials》发表的题为“Structure, dynamics and mechanical properties evolution of calcium silicate hydrate induced by dehydration and dehydroxylation” （https://doi.org/10.1016/j.conbuildmat.2021.123327）的高水平论文之后的又一项重要成果。
Figure 2. Molecular structures of the C-S(-H) with hydration degree of (a) 100%, (b) 60%, (c) 30% and (d) 0%. The molecular structures for all the models are presented in Supporting Information. (Yellow and red sticks represent the Si-O bonds; red and white ball-sticks represent hydroxyls and water molecules; green and gray spheres are calcium atoms in principal layers and interlayer regions, respectively; red points denote ionic oxygen atoms)
Figure 14. Molecular structure evolution (view along y direction) of C-S(-H) models with hydration degrees of 100% (first row) and 0% (second row) during z axial tensioning. The first, second, third and fourth columns are configurations at strains of 0.0, 0.2, 0.4 and 0.6 ?/?, respectively.
论文得到了国家自然科学基金青年基金（5200802）、武汉理工大学硅酸盐建筑材料国家重点实验室开放课题（SYSJJ2022-22）资助，是该团队国内科研交流合作取得的重要成果。（文：肖必华图：杨军 审稿：丁益）