Effect of magnesium silicate hydrate (M-S-H) formation on the local atomic arrangements and mechanical properties of calcium silicate hydrate (C-S-H): In situ X-ray scattering study

被引：25

作者：

Kim, Gyeongryul ^{[1
]}

Im, Sumin ^{[1
]}

Jee, Hyeonseok ^{[2
]}

Suh, Heongwon ^{[1
]}

Cho, Seongmin ^{[1
]}

Kanematsu, Manabu ^{[3
]}

Morooka, Satoshi ^{[4
]}

Koyama, Taku ^{[3
]}

Nishio, Yuhei ^{[3
]}

Machida, Akihiko ^{[5
]}

Kim, Jihoon ^{[6
]}

Bae, Sungchul ^{[1
]}

机构：

[1] Hanyang Univ, Dept Architectural Engn, Seoul 04763, South Korea

[2] Univ Illinois, Dept Civil & Environm Engn, Champaign Newmark 2145A,205 N Mathew, Urbana, IL USA

[3] Tokyo Univ Sci, Fac Sci & Technol, Dept Architecture & Bldg Engn, 2641 Yamazaki, Chiba 2788510, Japan

[4] Japan Atom Energy Agcy, Mat Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[5] Natl Inst Quantum & Radiol Sci & Technol, Synchrotron Radiat Res Ctr, Hyogo 6795148, Japan

[6] Muroran Inst Technol, Dept Civil Engn & Architecture, Hokkaido 0508585, Japan

来源：

CEMENT AND CONCRETE RESEARCH | 2022年 / 159卷

基金：

新加坡国家研究基金会;

关键词：

Calcium silicate hydrate; Magnesium silicate hydrate; Local atomic arrangement; Elastic modulus; X-ray scattering; LOW-PH CEMENT; PORTLAND CEMENTS; SULFATE ATTACK; PART I; SI-29; NMR; MODEL; FTIR; ENVIRONMENT; RESISTANCE;

D O I：

10.1016/j.cemconres.2022.106869

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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.

引用

页数：17

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