固体碱激发矿粉/粉煤灰注浆材料性能及机理研究

摘要/Abstract

摘要： 以矿粉和粉煤灰为主要原料,NaOH和Na₂SiO₃·5H₂O为固体碱激发剂,制备地聚合物注浆材料,考察激发剂的模数、掺量及养护条件对材料性能的影响。当固体碱激发剂模数为1.0,掺入量为8%(质量分数)时,注浆材料初凝时间为120 min,工作时间可达50 min,经28 d养护后抗折和抗压强度分别可达7.1 MPa和42.7 MPa。相较于非密闭养护,密闭养护有利于早期强度形成,1 d、3 d、7 d抗压强度分别提高了38.0%、38.2%和19.3%。XRD、FT-IR、SEM/EDS测试结果表明,原料水化完全,最终产物包含无定形水化产物、钙沸石、水合铝硅酸钠钙矿和C-S-H凝胶等组分。反应过程中原料的Si—O—Al、Si—O—Si发生重组生成凝胶物质,并团聚成钙沸石类球形产物,提高材料强度。

关键词: 注浆材料, 固体碱激发, 地质聚合物, 矿粉/粉煤灰, 道路养护, 力学性能

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

中图分类号:

TQ172

曹巍巍, 雷涛, 闵召辉, 徐肖龙, 段鹏鹏. 固体碱激发矿粉/粉煤灰注浆材料性能及机理研究[J]. 硅酸盐通报, 2021, 40(12): 4037-4043.

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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