Pore Structure and Media Transport Properties of Metakaolin-Slag Geopolymer

Abstract

Abstract: Geopolymer is a novel cementitious material with low carbon properties produced by chemical activation, which has great potential to partially replace cement. The pore structure of metakaolin-slag geopolymer paste and mortar was characterized by mercury intrusion porosimetry tests. The effects of liquid-solid ratio and sand volume fraction on pore structure properties were analyzed, the correlation between pore structure properties and surface fractal dimension was clarified, and the permeability resistance of metakaolin-slag geopolymer paste and mortar was investigated using chloride unsteady electromigration test, unsteady natural diffusion test and moisture diffusion test. The correlation between liquid-solid ratio, sand volume fraction, pore surface fractal dimension, and slurry media transport performance was analyzed. The results show that with the increase of liquid-solid ratio, the porosity and the most available pore size of geopolymer paste increase and the permeability resistance decreases. The permeability resistance of geopolymer mortar is superior to that of cement mortar. The most available pore size and media transfer coefficient of geopolymer mortar decrease first and then increase with the increase of sand volume fraction, and the permeability resistance increases first and then decreases. Furthermore, the pore surface fractal dimension can well characterize the pore structure properties of geopolymer slurry and has a good correlation with permeability resistance.

Key words: alkali-activated cementitious material, geopolymer, chloride, permeability, pore structure, fractal dimension

CLC Number:

TU528

XIE Guolun, ZHONG Qingyu, YANG Yiwei, HUANG Dunwen, PENG Hui. Pore Structure and Media Transport Properties of Metakaolin-Slag Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 2092-2105.

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