Formulation of an alkali-free accelerator and its effects on hydration and mechanical properties of Portland cement

被引：45
|
作者：
Wang, Yifei [1 ,2 ,3 ]
Shi, Caijun [1 ,2 ,3 ,4 ]
Lei, Lei [5 ]
Ma, Yihan [1 ,2 ,3 ]
Liu, Jianhui [6 ]
Hu, Xiang [1 ,2 ,3 ]
机构：
[1] Hunan Univ, Coll Civil Engn, Key Lab Green & Adv Civil Engn Mat & Applicat Tec, Changsha 410082, Hunan, Peoples R China
[2] Hunan Univ, Int Sci Innovat Collaborat Base Green & Adv Civil, Changsha 410082, Hunan, Peoples R China
[3] Hunan Univ, Key Lab Bldg Safety & Energy Efficiency, Minist Educ, Changsha 410082, Hunan, Peoples R China
[4] Univ British Columbia, Dept Civil Engn, 6250 Appl Sci Lane, Vancouver, BC V6T 1Z4, Canada
[5] Tech Univ Muncheen, Chair Construct Chem, Lichtenbergstr 4, D-85747 Garching, Germany
[6] Guangxi Univ, Sch Civil Engn & Architecture, Key Lab Disaster Prevent & Struct Safety, China Minist Educ, Nanning 530004, Peoples R China
来源：
CEMENT & CONCRETE COMPOSITES | 2022年 / 129卷
基金：
中国国家自然科学基金;
关键词：
Alkali-free accelerator; Aluminum sulfate; Magnesium sulfate; Hydration; Mechanical properties; PORE SOLUTION; PASTES; TEMPERATURE; SHOTCRETE; STRENGTH;
D O I：
10.1016/j.cemconcomp.2022.104485
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
An alkali-free accelerator (AMD) mainly composed of aluminum sulfate, magnesium sulfate and diethanolamine (DEA) was formulated and its effects on hydration and mechanical properties of Portland cement were investigated. Results indicate that AMD accelerator can efficiently shorten the setting time and enhance the early strength of Portland cement. The rapid setting and hardening properties were achieved by promoting the formation of ettringite (AFt), Mg(OH)2 and MgAl-hydrotalcite (MgAl-LDHs). Although AMD accelerator retarded early hydration of alite due to the accelerated hydration of C3A and caused higher porosity, it had no negative effect on or even slightly increased long-term strength development. Except for environmentally-friendly advantage, this type of alkali-free accelerator is more beneficial to strength development compared to accelerators with fluoride salts.
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页数：10
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