期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 279, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.122526
关键词
Corn cob ash; Drying shrinkage; Electrical resistivity; Concrete strength; Ultra-fine slag
资金
- Curtin University
This paper presents a scientific attempt to study the performance of sustainable geopolymer concrete based on rice husk ash and ultra-fine slag, with corn cob ash used as a substitute. The study found that corn cob ash and slag significantly improved the strength and durability of concrete, suggesting potential for replacing traditional concrete in structural applications.
This paper presents the first scientific attempt to develop and study the performance of rice husk ash (RHA) and ultra-fine slag (UFS) based sustainable geopolymer concrete with different ratio of corn cob ash (CCA). NaOH (8 M) and Na2SiO3 were employed as alkaline activators. CCA acted mainly as amorphous silica and was utilised as a substitute for RHA. The effects of different CCA contents (0%, 3%, 6%, 9% and 12% by RHA mass) on the performance of geopolymer concrete in terms of fresh, hardened and durability properties have been evaluated. Different characteristics, i.e. density, air content, workability, compressive, flexural and split tensile strengths, Young's modulus of elasticity were investigated. Meanwhile, the durability performance was also evaluated by using different methods such as rapid chloride penetration test, chloride conductivity test, water sorptivity test and DIN (Deutsches Institut fur Normung) water permeability test. The outcomes of this research have shown that UFS and CCA improved the compressive strength by 14-15%. They significantly improved the polymerisation and thus enhanced the strength and durability of sustainable geopolymer concrete. Furthermore, CCA and UFS acted as micro fillers and increased the CaO as well as SiO2 contents which enhanced the densification. Additionally, the development of hydration products in the matrix, enhanced the pore structure and thus the strength. This study revealed that CCA (up to 6%) can be utilised as a substitute binder to produce sustainable geopolymer concrete, and has the potential to replace conventional concrete for structural applications. (C) 2021 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