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Influence of expansive calcium sulfoaluminate agent dosage on properties and microstructure of expansive self-compacting concretes
Cement & Concrete Composites ( IF 10.5 ) Pub Date : 2019-11-19 , DOI: 10.1016/j.cemconcomp.2019.103464
P. Carballosa , J.L.García Calvo , D. Revuelta

Expansive concretes based on the formation of ettringite from calcium sulfoaluminate agents are presented as an effective alternative to minimize the problems derived from shrinkage and low tensile strength at the early ages of the concrete. However, determining the mechanism responsible for the expansion is still a controversial issue today. In this study, the influence of three doses of expansive agent on fresh state and on compressive strength and magnitude of free expansion under two curing environments was evaluated on a reference mixture of self-compacting concrete (SCC). The microstructural evolution of the hydrates and anhydrous related with the expansive phenomena was also studied. From our observations it seems that microcrystalline/X-Ray amorphous ettringite is formed and that this ettringite would be strongly related to expansion. As a result, the influence of the ratio w/cementitious material and curing environment on the magnitude of the expansion as well as the influence of this on the mechanical properties of the SCCs was identified.



中文翻译:

膨胀型硫铝酸钙用量对膨胀型自密实混凝土性能和微观结构的影响

提出了一种以硫铝铝酸钙形成钙矾石为基础的膨胀混凝土,作为一种有效的替代方法,可以最大程度地减少混凝土早期产生的收缩和低拉伸强度带来的问题。但是,今天,确定负责扩展的机制仍然是一个有争议的问题。在这项研究中,在自密实混凝土(SCC)的参考混合物上评估了三剂膨胀剂对新鲜状态的影响以及对两种固化环境下抗压强度和自由膨胀强度的影响。还研究了与膨胀现象有关的水合物和无水物的微观结构演变。从我们的观察看来,形成了微晶/ X射线无定形钙矾石,并且该钙矾石将与膨胀强烈相关。

更新日期:2019-12-11
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