Characteristics and Mechanism of Modified Triethanolamine as Cement Grinding Aids

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 30; no. 1; pp. 134 - 141
• Main Authors: Zhao, Jihui, Wang, Dongmin, Wang, Xueguang, Liao, Shucong
• Format: Journal Article
• Language: English
• Published: Heidelberg Wuhan University of Technology 01.02.2015; Springer Nature B.V
• Subjects: Aids; Cementitious Materials; Cements; Chemistry and Materials Science; Compressive strength; Hydration; Hydroxyl groups; Materials Science; Minerals; Surface chemistry; Triethanolamine; Zeta电位; 三乙醇胺; 产品结构; 机制; 水泥助磨剂; 水泥矿物; 表面吸附; 颗粒特性; cement; cement hydration; mechanical property; particles characteristics; mechanism; grinding aids; modified triethanolamine
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-015-1114-9

Effects of modified triethanolamine as cement grinding aids on particles characteristics and mechanical property of cement were studied, and its reaction mechanism was analyzed by IR, Zeta potential, SEM, XRD and TG-DTA. The results show that the content of 3-32 μm particles for cement with 0.015% modified triethanolamine（M-TEA） is increased by 12.4%, and the compressive strengths of cement with 0.03% M-TEA are increased by 5.5 and 8.2 MPa at 3 and 28 days, respectively. And both the grinding and enhancement effects of M-TEA on cement are better than triethanolamine. The mechanism analysis shows that M-TEA not only has the amino and hydroxyl groups of TEA, but also has the ester, carbonyl, carboxyl groups which easily combine with metal ions of cement minerals, resulting in that M-TEA can promote surface adsorption and shield the unsaturated charges in the surface and crack section of particles, thus particles reunion is prevented and grinding efficiency is improved. Enhancement of M-TEA on cement mainly lies in that it can promote or induce hydration reaction of cement mineral with gypsum and water, which accelerates formation of hydration products, and then improves the structure and morphology of cement hydration products, thus the uniformity and compactness of product structure is increased.