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Archives of civil engineering
Influence of Different Types of Nanosilica on Compressive Strength Development of Cement Matrix Composites
article
J. Popławski1  M. Lelusz1 
[1] Białystok University of Technology, Faculty of Civil Engineering and Environmental Sciences
关键词: cement;    nanosilica;    admixture;    nanoparticles;    paste;   
DOI  :  10.24425/ace.2020.135215
学科分类:建筑学
来源: Polska Akademia Nauk * Instytut Podstawowych Problemow Techniki / Polish Academy of Sciences, Institute of Fundamental Technological Research
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【 摘 要 】

This article presents test results of cement paste and binders with admixture of hydrophilic or hydrophobic nanosilica. The aim of the study was to determine the influence of nanosilica type and mixing method on compressive strength, porosity, and bulk density of cement paste, also on hydration heat of cement binders. The binder compounds were mixed in high speed mixer in order to provide the highest possible dispersion of nanoparticles in the binder before adding it to mixing water. Two mixing methods were studied. The admixtures increased the reactivity of cement binders. Both nanosilica types increased early compressive strength by 25% in comparison with control series. The increase in 28-day compressive strength was observed with the admixture of hydrophilic nanosilica. The differences in dynamics of binders rate of hydration and development of cement pastes compressive strength denote different reaction mechanisms of both types of nanosilica. Application of higher rotation speeds does not guarantee satisfactory mixing of the binder components. For compressive strength enhancement of cement paste prolonged mixing time occurred to be more important.

【 授权许可】

Unknown   

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