Chemical mechanisms and kinetic modeling of calcium aluminate cements hydration in diluted systems: Role of aluminium hydroxide formation

被引:17
作者
Maach, N. [1 ]
Georgin, J. F. [1 ]
Berger, S. [2 ]
Pommay, J. [2 ]
机构
[1] Univ Lyon, Lab GEOMAS Geomecan Mat Struct, INSA Lyon, GEOMAS,EA7495, F-69621 Villeurbanne, France
[2] Imerys Technol Ctr, 1 Rue Le Chatelier, F-38090 Vaulx Milieu, France
关键词
Hydration; Kinetics; Calcium aluminate cement; Aluminium hydroxide; pH;
D O I
10.1016/j.cemconres.2021.106380
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Calcium aluminate cements are niche cements used in the refractory industry and in non-structural applications for building chemistry with short return-to-service delay. The later applications use theses cements in combination with calcium sulfates for long-term stability. By being niche cements, the knowledge of calcium aluminate cements hydration is not as extensive as that of Portland cement. In the present paper, the calcium aluminate cements are studied in diluted suspensions as a function of different parameters such as the suspension concentration or the quantity of added calcium sulfates. The objective is to identify their baseline chemical mechanisms. This work demonstrates the essential role of hydroxide ions fluxes, i.e. quantity going in and out of the liquid phase per unit of time. The main quantitative flux is the formation of aluminium hydroxide but the activation of this reaction is difficult. This difficulty allows calcium aluminate to be used as cement by creating a dormant period (workability) for the overall reactivity. The identification of the key role of aluminium hydroxide formation explains the influence of the temperature, some mechanisms of setting admixtures and the early age of calcium aluminate cements.
引用
收藏
页数:17
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