Affiliation:
1. College of Engineering, University of Thi-Qar , Nasiriyah , Iraq
Abstract
Abstract
Geopolymer (GP) has recently emerged as a novel and environmental friendly alternative to conventional soil stabilization products like lime and Ordinary Portland Cement (OPC), which adversely affect the environment. This article emphasizes GPs produced from high calcium class C fly ash (CFA) and an alkali activator comprising sodium hydroxide and sodium silicate solution for sand stabilization. The experimental program includes a series of unconfined compressive strength (UCS), flexural strength, tensile strength, and microstructural analyses using scanning electron microscopy. Results revealed that UCS, flexural strength, and tensile strength of GP-treated soil were in the range of 2–10, 0.5–2.0, and 0.4–1.2 MPa, respectively (depending on the ratio of fly ash and activator). These strengths were even higher than those of cement-stabilized soil. The microstructural analysis revealed that the formation of dense calcium–sodium alumina–silicate hydrated gel (C, N–A–S–H) is the reason for strength improvement. According to the findings of this study, using a CFA-GP binder for soil improvement is a viable alternative to OPC in geotechnical applications.
Subject
Mechanics of Materials,Materials Science (miscellaneous)
Reference33 articles.
1. Pacheco-Torgal F, Labrincha J, Leonelli C, Palomo A, Chindaprasit P. Handbook of alkali-activated cements, mortars and concretes. UK: Elsevier; 2014.
2. Davidovits J. Geopolymer chemistry and applications. 2nd ed. Saint-Quentin, France: Institut Géopolymère; 2008.
3. Singhi B, Laskar AI, Ahmed MA. Investigation on soil–geopolymer with slag, fly ash and their blending. Arab J Sci Eng. 2016;41(2):393–400. 10.1007/s13369-015-1677-y.
4. Zhang M, Guo H, El-Korchi T, Zhang G, Tao M. Experimental feasibility study of geopolymer as the next-generation soil stabilizer. Constr Build Mater. 2013;47:1468–78.
5. Van Deventer JSJ, Xu H. Geopolymerisation of aluminosilicates: relevance to the minerals industry. Aus IMM Bull. 2002;33:20–7.
Cited by
7 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献