Effect of source materials, additives on the mechanical properties and durability of fly ash and fly ash-slag geopolymer mortar: A review

Published on Apr 19, 2021in Construction and Building Materials6.141
· DOI :10.1016/J.CONBUILDMAT.2021.122443
Shaise K John3
Estimated H-index: 3
 (College of Engineering, Trivandrum), Yashida Nadir6
Estimated H-index: 6
 (College of Engineering, Trivandrum), K. Girija2
Estimated H-index: 2
 (College of Engineering, Trivandrum)
Source
Abstract
Abstract Geopolymer is a sub-class of alkali activated materials composed of base materials containing aluminosilicates which can be used for construction with reduced environmental impact by utilisation of waste material leading to economical construction. This study reviews the properties of fly ash and fly ash-slag geopolymer mortar including microstructural properties, fresh properties such as setting time and workability, hardened properties such as compressive strength and tensile strength and durability properties (thermal resistance, shrinkage, acid resistance, chloride resistance, sulphate resistance). The effect of types of alkaline solutions, its concentration, and combination of different types of alkaline activators, fine aggregate to binder ratio, alkaline solution to binder ratio, curing temperature and curing duration, and presence of different types of superplasticizers are discussed. The study also reviews the effect of different additives such as silica fume, alccofine, quartz powder, alumina, epoxy, bio-additives, different types of fibres, nano-materials in fly ash and fly ash-slag geopolymer mortar. The present study carried out elaborate discussion of the effect of mix proportioning on fresh, hardened and durability properties of fly ash geopolymer and fly ash-slag geopolymer mortar. The study summarises the common findings from the reviewed research papers.
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Abstract Geopolymer materials are increasingly finding application in various settings because of their excellent mechanical properties and their ability to reduce the level of CO2 emission in the atmosphere, thus contributing to a sustainable environment. Mortars containing an alkali-activated fly ash binder in which river sand is used as an aggregate are found to display poor adhesive strength and incompatibility at elevated temperatures, necessitating researchers to look for alternate aggrega...
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Abstract 3D printed fly ash based geopolymer was prepared with fly ash and quartz sand as main raw materials while slag powder and silica fume as supplementary cementitious materials. In this paper, anhydrous sodium silicate powder was used as activator and ATTAGEL-50 thixotropic thickener was used as 3D printing additive. The effect of slag powder and silica fume on the rheological properties of 3D printed fly ash based geopolymer was studied. The results show that the apparent viscosity, thixo...
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The inorganic structure formed at the stage of setting of the geopolymer binder ensures high durability of the material under high-temperature conditions. However, changes in the microstructure of the material are observed. The purpose of the study was to analyze changes in the structure of geopolymer mortar after exposure to high temperatures T = 200, 400, 600, 800, and 1000 °C. Mortars with a binder based solely on fly ash (FA) and mixed in the 1:1 ratio with a binder containing fly ash and gr...
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Abstract This study aims to provide a better understanding of the autogenous shrinkage of slag and fly ash-based alkali-activated materials (AAMs) cured at ambient temperature. The main reaction products in AAMs pastes are C-A-S-H type gel and the reaction rate decreases when slag is partially replaced by fly ash. Due to the chemical shrinkage and the fine pore structure of AAMs pastes, drastic drop of internal relative humidity is observed and large pore pressure is generated. The pore pressure...
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Abstract null null Application of high-volume slag based geopolymer mortar is often confined to usage in controlled environments due to its limited flexibility in controlling the setting time. The main aim of the study is to regulate the fast setting of Ultrafine blast furnace slag (UBFS)-based geopolymer mortar (GM) by utilizing mineral admixture. UBFS, partially replaced by Flyash (FA), are investigated by both sodium hydroxide (SH), and a combined solution of sodium hydroxide and sodium silic...
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