This study explored the effect of M-S-H formation on the local atomic arrangements and mechanical properties of C-S-H. The elastic moduli of the samples were calculated using shifted atomic distances (r) and d-spacings (d) acquired by applying an external load on the pastes during X-ray scattering experiments. The experimental results indicated that the crystal structure of C-S-H remained intact with MgCl₂ addition. At the highest Mg/Si ratio (Ca/Si = 0.6, Mg/Si = 0.2), change in the dominant phase occurred from C-S-H to M-S-H because the low pH environment hindered the formation of C-S-H and facilitated the formation of M-S-H. The elastic modulus decreased with increasing Mg/Si ratio up to 0.1 owing to both C-S-H destabilization and low M-S-H content in the samples. Conversely, the elastic modulus increased in the paste synthesized with the highest Mg/Si ratio because considerable M-S-H had formed, which exhibited a higher elastic modulus than C-S-H.

本研究探讨了 MSH 的形成对 CSH 的局部原子排列和力学性能的影响。样品的弹性模量是使用在 X 射线散射实验期间通过在浆料上施加外部载​​荷而获得的偏移原子距离 ( r ) 和 d 间距 ( d ) 计算的。实验结果表明，CSH的晶体结构在MgCl _{2的作用下保持完整。}添加。在最高 Mg/Si 比（Ca/Si = 0.6，Mg/Si = 0.2）下，由于低 pH 环境阻碍了 CSH 的形成并促进了 MSH 的形成，主相从 CSH 变为 MSH。由于样品中的 CSH 不稳定和低 MSH 含量，弹性模量随着 Mg/Si 比增加到 0.1 而降低。相反，在以最高 Mg/Si 比合成的浆料中，弹性模量增加，因为已形成大量 MSH，其弹性模量高于 CSH。