Nano-scale mechanics of coarse-grained C-S-H with molecular dynamics

被引：3

作者：

Liu, Qinlong ^{[1
]}

Lu, Wei ^{[2
]}

Zhu, Jing ^{[2
]}

Qi, Qinde ^{[2
]}

Li, Guangzhou ^{[2
]}

Li, Dongbo ^{[2
]}

机构：

[1] Xian Univ Architecture & Technol, Basic Mech Expt Ctr, 13 Yanta RD, Xian 710055, Peoples R China

[2] Xian Univ Architecture & Technol, Sch Sci, Xian 710055, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2023年 / 400卷

基金：

中国国家自然科学基金;

关键词：

C; -S; -H; Molecular dynamics; Mechanical properties; Polydispersity; Packing fraction; CALCIUM-SILICATE-HYDRATE; DENSITY; NANOINDENTATION; MICROSTRUCTURE;

D O I：

10.1016/j.conbuildmat.2023.132494

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The strength of concrete is largely controlled by colloidal calcium-silicate-hydrate (C-S-H) gel. However, the mechanical behavior of calcium-silicate-hydrates (C-S-H) is still an enigma that has deceived many decoding attempts from experimental and theoretical sides. In this paper, based on coarse-grained mesoscale simulations, we investigate the mechanical properties of polydisperse C-S-H based on statistical theory. Our simulations offer a good agreement with nanoindentation data over a large range of packing fraction. The results show that, the bulk modulus and indentation modulus of C-S-H colloidal structure are closely related to packing fraction, and show significant linear positive correlations. The results are confirming and extending the existing data. Furthermore, the grain size significantly affects the packing fraction, and the packing fraction of C-S-H colloidal structure can be improved by decreasing the minimum grain diameter or increasing the maximum grain diameter. So, increase the range of grain diameter can improve the packing fraction of C-S-H structure signifi-cantly, so as to strengthen its mechanical properties.

引用

页数：13