期刊
JOURNAL OF CLEANER PRODUCTION
卷 252, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2019.119797
关键词
Recycled aggregate; Geopolymer concrete; Nano silica; Rice husk ash; Fire resistance
资金
- Ratchadapisek Somphot Fund for Postdoctoral Fellowship, Chulalongkorn University
- Chulalongkorn Academic Advancement into Its 2nd Century Project, Chulalongkorn University
- Faculty of Engineering, Chulalongkorn University, Thailand
The use of recycled aggregates in geopolymer concrete provides an eco-friendly alternative for the construction industry. Since geopolymer concretes made with recycled aggregates generally have weaker internal structure compared with those using natural aggregates, SiO2-rich materials have therefore been used to improve the strength properties, one of which is the well-known nano-SiO2 (nS). However, because nS is not environmental friendly, other green SiO2-rich materials, such as rice husk ash (RHA) from agricultural wastes, are needed. The objective of this study is to investigate the effectiveness of replacing nano-SiO2 with rich husk ash for improving the performance of recycled aggregate geopolymer concrete (RAGC) made from high-calcium fly ash that is able to set and harden without heat curing. The mechanical properties and fire-resistant performance of RHA-added and nS-added geopolymer concretes were tested and compared. The results show that the addition of RHA is effective in improving the strengths of RAGCs, particularly when the SiO2/Al2O3 ratio is increased to 4.17. The 28-day compressive strengths of RAGCs containing RHAs ranged from 36.0 to 38.1 MPa due to the improved microstructure and denser matrix and were comparable to those of RAGCs made with nS. However, the inclusion of SiO2-rich materials had an adverse effect on the post-fire residual strength of geopolymer concretes made from recycled aggregates due primarily to the reduced porosity. (C) 2019 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据