期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 106, 期 -, 页码 500-511出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2015.12.141
关键词
Geopolymer; Sarawak fly ash; Alkali activator/ash; Mixture proportions; Compressive strength
资金
- Swinburne Sarawak Research Centre for Sustainable Technologies
Fly ash sourced from Sarawak, Borneo was alkali-activated by a combination of alkali hydroxides (i.e. NaOH, KOH or Ca(OH)(2)) and sodium silicate (i.e. industrial or commercial grade Na2SiO3) in this research. A comprehensive overview of the compressive strength of geopolymer due to different alkali activator/fly ash and Na2SiO3/NaOH (Na2SiO3/KOH or Na2SiO3/Ca(OH)(2)) were studied. The results show that geopolymer made using Sarawak fly ash can be a potential construction material depending on the requirements of workability and compressive strength. The core study of this research was the investigation on the variations of compressive strength due to the oxide molar ratios. The results revealed that higher oxide molar ratios do not necessarily lead to higher compressive strengths. SiO2/Na2O, Al2O3/Na2O, SiO2/K2O and Al2O3/K2O weight ratios had dissimilar effects on the compressive strength of NaOH- and KOH-based geopolymer. The reduction of SiO2/Na2O and Al2O3/Na2O in NaOH- and KOH-based geopolymer using commercial grade Na2SiO3 intensively increased the strength capability. The ratios of SiO2/Na2O and Al2O3/Na2O in Ca(OH)(2)-based geopolymer were the highest, nevertheless, the compressive strength and workability of Ca(OH)(2)-based geopolymer were the weakest in comparison to NaOH- and KOH-based geopolymers. Na2O was postulated as the major alkali oxide required for the strength development rather than K2O in both NaOH- and KOH-based geopolymer. However, K2O in KOH-based geopolymer may govern the strength development when Na2O is low in the mixture. (C) 2015 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