期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 29, 期 11, 页码 15318-15336出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-18310-8
关键词
Concrete; Nanosilica; Concrete microstructure; Waste materials
资金
- Ministry of Higher Education (MOHE)
- Universiti Tun Hussein Onn Malaysia [FRGS/1/2018/TK01/UTHM/02/3]
Exposing concrete to high temperatures can lead to detrimental effects on its properties, but these can be mitigated by using waste materials and incorporating nanosilica. This study evaluates the effects of nanosilica on concrete properties under elevated temperatures and provides an overview of the impact of elevated temperature on concrete containing waste materials.
Exposing concrete to high temperatures leads to harmful effects in its mechanical and microstructural properties, and ultimately to total failure. In this sense, various types of waste materials are exploited not only to tackle serious environmental issues but also to enhance the thermal stability of concrete exposed to elevated temperatures. Furthermore, nanomaterials have been incorporated in concrete as admixtures to reduce the thermal degradation of concrete due to exposure to high temperatures. In the present study, the effects of nanosilica (NS) incorporation on the properties of concrete subjected to elevated temperature are discussed in several sequential sections. The process mechanism of concrete deterioration due to fire exposure and the important factors that could affect the performance of concrete under fire were evaluated. Moreover, brief highlights on the effect of elevated temperature on concrete containing waste materials are included in this review paper. Reviews and summaries of the available and updated literature regarding concrete containing NS are considered. According to the findings of the studies under review, the addition of nanosilica to concrete contributed in reduced strength loss, minimized internal porosity, and enhanced matrix compactness in concrete.
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