Journal
MATERIALS TODAY COMMUNICATIONS
Volume 31, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2022.103755
Keywords
Calcium silicate hydrate(C-S-H); MD simulation; Mechanical properties; Ca; Si ratio; Strain rate
Categories
Funding
- National Natural Science Foundation of China [52022047, 52192672]
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The research shows that the Young's moduli and peak stresses of C-S-H increase with rising strain rates and decrease resulting from the increasing Ca/Si ratios. This study reveals the influence of diverse Ca/Si ratios and various strain rates on C-S-H from molecular insight.
Ca/Si ratios and strain rates significantly affect the properties of calcium silicate hydrate (C-S-H), which dominates the mechanical characteristics of concrete composites. Consequently, it is necessary to reveal the influence of Ca/Si ratios and strain rates on the mechanical characteristics of C-S-H. In this paper, considering the scope of the Ca/Si ratio of C-S-H, model constructions with diverse Ca/Si ratios (Ca/Si = 1.24, 1.41, 1.64, 1.80) were performed. Various strain rates with values of 0.1 ps(-1), 0.01 ps(-1), and 0.001 ps(-1) in the x, y and z directions were designed in uniaxial tensile tests by molecular dynamics simulations. The simulations demonstrate that the Young`s moduli and peak stresses of C-S-H increase with rising strain rates and decrease resulting from the increasing Ca/Si ratios. This research uncovers the influence of diverse Ca/Si ratios and various strain rates on CS-H from molecular insight. This research improves the understanding of the influence mechanism of Ca/Si ratio and strain rate on the mechanical properties of C-S-H.
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