Performance and Mechanism of Solid Alkali-Activated Slag/Fly Ash Grouting Material

Abstract

Abstract: The solid alkali-activated geopolymer grouting material was prepared by slag/fly ash as the raw material and NaOH/Na₂SiO₃·5H₂O as the activator. The effect of activator and curing conditions on mechanical properties, setting time and fluidity were investigated. It is found that when the solid alkali-activator is added with the dosage of 8% (mass fraction) and modulus of 1.0, the initial setting time and working time of grouting material can reach 120 min and 50 min, respectively. After 28 d of curing, the flexural and compressive strength of hydration product reach 7.1 MPa and 42.7 MPa, respectively. It also shows that compared with un-sealed curing, sealed curing is conducive to the formation of early strength of materials, the compressive strength of 1 d, 3 d and 7 d increases by 38.0%, 38.2% and 19.3%, respectively. The microstructure of product was analyzed by methods of XRD, FT-IR, SEM/EDS. The results show that the raw material is completely hydrated, and the product formed by grouting material mainly includes amorphous hydration products, calcium zeolite, hydrated aluminum silicate sodium calcium ore and C-S-H gel. During the reaction process, Si—O—Al and Si—O—Si derived from raw materials recombine to form gel, and agglomerated into spherical products of calcium zeolite to improve the strength of the material.

Key words: grouting material, solid alkali-activation, geopolymer, slag/fly ash, road maintenance, mechanical property

CLC Number:

TQ172

CAO Weiwei, LEI Tao, MIN Zhaohui, XU Xiaolong, DUAN Pengpeng. Performance and Mechanism of Solid Alkali-Activated Slag/Fly Ash Grouting Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4037-4043.

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