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稻壳灰抑制超高性能混凝土的自收缩机理分析
作者:叶光1 2 V.T.NGUYEN1 3 
单位:1. 荷兰代尔夫特理工大学土木工程学院 微观结构实验室 荷兰 代尔夫特 2600GA 2. Magnel Laboratory for Concrete research  Department of Structural engineering  Ghent University  Ghent B-9000  Belgium 3. 越南河内土木工程大学建筑材料系 越南 河内 84.4 
关键词:稻壳灰 超高性能混凝土 自收缩 
分类号:TU528
出版年,卷(期):页码:2012,40(2):212-216
DOI:
摘要:

  要:在过去的十几年中,超高性能混凝土(UHPC)由于其优异的性能(如:超高强度,低渗透性和优良的耐久性)已经成为一种非常有前景的建筑材料。然而,UHPC也像普通高性能混凝土一样,由于水泥和硅灰的掺量比较高,使其具有很大的自收缩性能。寻求一种有效减少自收缩的方法是近年来水泥及混凝土研究领域的一个非常重要的任务。本研究中采用稻壳灰(RHA)降低UHPC自收缩。结果表明:由于RHA具有很高的活性SiO2含量和特殊的多孔结构,添加20%平均粒径为5.6 μmRHA可以抵消水化15 d后的UHPC的自收缩;RHA用于UHPC中不仅降低了成本,提高混凝土早期性能,同时也有益于减少环境污染。

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Abstract: Ultra-high performance concrete (UHPC) becomes one of promising concretes in the last decade due to its excellent performance such as ultra high strength, low permeability and very good durability. However, like high performance concrete, the UHPC is also subjected to high autogenous shrinkage due to a great amount of cement and silica fume used. The reduction of the autogenous shrinkage is an important task in the field of cement and concrete research. In this work, the rice husk ash (RHA) as an agriculture waste was used to mitigate the autogenous shrinkage of UHPC. The results show that RHA with a high content of amorphous SiO2 and the special porous structure. When 20% RHA with particle size of 5.6 μm was used, the shrinkage of UHPC was eliminated after curing for 15 d. RHA used in UHPC can reduce the cost, improve the early age properties of the UHPC and increase the environmental benefits because RHA has high content of atmorphous SiO2 and special structure.

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作者简介:
第一作者:叶光(1966—),男,博士,副教授。
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