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混凝土混合物的成分对其体积变化的影响。

The Effect of the Composition of a Concrete Mixture on Its Volume Changes.

作者信息

Ťažký Martin, Bodnárová Lenka, Ťažká Lucia, Hela Rudolf, Meruňka Milan, Hlaváček Petr

机构信息

Faculty of Civil Engineering, Institute of Technology of Buildings Materials and Components, Brno University of Technology, Veveri 331/95, 602 00 Brno, Czech Republic.

Department of Material Disintegration, Institute of Geonics of the CAS, Studentska 1768, 708 00 Ostrava, Czech Republic.

出版信息

Materials (Basel). 2021 Feb 9;14(4):828. doi: 10.3390/ma14040828.

DOI:10.3390/ma14040828
PMID:33572302
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7916164/
Abstract

The presented research aims to clarify the specific effect of the individual components of concrete with Portland cement CEM I 42.5 R on the volume changes of concrete. The effect of the filler component was evaluated from the point of view of the composition and type of aggregate (crushed versus mined) and from the point of view of the mineralogical composition of the aggregate. Concrete formulas with a maximum aggregate grain size of 16 and 22 mm were assessed. The effect of the binder component on the shrinkage of the concrete was monitored on the concrete mixtures produced using the same aggregate and maintaining the same strength class of concrete, C 45/55. The effect of the addition of finely ground limestone, finely ground granulated blast furnace slag and coal high-temperature fly ash was monitored. It was found that the maximum aggregate grain and the type of grading curve do not have a significant effect on the volume changes of concrete. Concretes with mined aggregates showed lower shrinkage than concretes with crushed aggregates. The most significant is the effect of the type of aggregate on the volume changes in the first 24 h. Mineral additives have a positive effect on the elimination of the volume changes of concrete, while the addition of high-temperature fly ash proved to be the most suitable.

摘要

本研究旨在阐明波特兰水泥CEM I 42.5 R混凝土各组分对混凝土体积变化的具体影响。从骨料的组成和类型（破碎骨料与天然骨料）以及骨料的矿物组成角度评估了填充料组分的影响。评估了最大骨料粒径为16毫米和22毫米的混凝土配方。在使用相同骨料并保持相同混凝土强度等级C 45/55的情况下，监测了胶凝材料组分对混凝土收缩的影响。监测了添加细磨石灰石、细磨粒化高炉矿渣和高温粉煤灰的影响。结果发现，最大骨料粒径和级配曲线类型对混凝土体积变化影响不显著。天然骨料混凝土的收缩率低于破碎骨料混凝土。最显著的是骨料类型对最初24小时内体积变化的影响。矿物添加剂对消除混凝土体积变化有积极作用，而高温粉煤灰的添加被证明是最合适的。

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