Experimental Study on Proportion of Room Temperature Alkali-Activated Low-Calcium Fly Ash Geopolymer

Abstract

Abstract: In order to investigate the influence of the mass ratio of fly ash to alkali activator, the mass ratio of water glass to sodium hydroxide solution, and the molar concentration of sodium hydroxide solution on the mechanical properties of fly ash geopolymer at room temperature, low-calcium fly ash were used as raw material to prepare geopolymer cementing material. Orthogonal test method was used to analyze the compressive strength of fly ash geopolymers and to discuss the influence of the ratio of alkali activator on the mechanical properties of fly ash geopolymers. SEM, XRD and FTIR were also carried out to characterize the geopolymer samples, and the stress-strain relationship of the material was studied. The results show that the compressive strength of fly ash geopolymer increases with the decrease of activator content, and the ratio of water glass in activator is positively correlated with the compressive strength. When the mass ratio of fly ash to alkali activator is 1.8, the mass ratio of water glass to sodium hydroxide solution is 2.5, and the concentration of sodium hydroxide solution is 10 mol/L, the compressive strength of the obtained geopolymer after curing for 120 d reaches to 51.98 MPa. The stress-strain curves show that the amount of activator has a greater impact on the failure strain and elastic modulus of fly ash geopolymer to some extent. Moreover, the results of SEM, XRD and FTIR show that the structure of the cementitious material system become denser with the increase of curing time, and more aluminosilicate gels are mainly generated.

Key words: room temperature, fly ash geopolymer, orthogonal test, compressive strength, stress-strain curve

CLC Number:

TU528

WEI Wei, GAO Yanbin, CHEN Zhongqing, ZHU Wentao, ZHU Zewei. Experimental Study on Proportion of Room Temperature Alkali-Activated Low-Calcium Fly Ash Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3889-3896.

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