Influences of Acid Activators on Properties of Solid Waste Materials and Grouting Materials

doi:10.16552/j.cnki.issn1001-1625.2024.1209

Abstract

Abstract: In order to improve the utilization rate of solid waste, hydrochloric acid, acetic acid and oxalic acid were respectively selected as acid activators to impregnate and excite fly ash and slag micro-powder, subsequently prepareing grouting materials. The optimal excitation concentration of acid activator was determined by measuring the mechanical properties of grouting materials. The specimens were placed in standard curing environment, 3% (mass fraction) NaCl solution, 3% (mass fraction) Na₂SO₄ solution, 3% (mass fraction) NaCl and Na₂SO₄ mixed solution for curing for 28 d, respectively. The corrosion resistance coefficient was calculated by measuring the flexural strength of the specimen, and the corrosion resistance of the grouting material prepared after acid excited solid waste in different corrosion environments was analyzed comprehensively combined with the microstructure of the specimen. The results show that after the grouting material specimens prepared by soaking and exciting fly ash and slag in a 2.0% (mass fraction) hydrochloric acid solution, the compressive strength is the highest, which can reach 64.5 MPa. The contents of quartz and ettringite in the grouting material prepared after acid excitation of fly ash and slag increase, and acid excitation can promote the hydration reaction to a certain extent. The grouting material specimens prepared by hydrochloric acid excitation have the poorest resistance to the erosion of Cl^- and can resist the erosion of SO^2-₄ to a certain extent.

Key words: acid excitation, solid waste material, grounting naterial, mechanical property, micro-mechanism, durability

CLC Number:

TU525

ZHANG Huifang, CHEN Jie, WANG Lei, LI Xiaochen, LI Jinzhu, LIU Kaihong, CAO Hui, REN Zejiang, LIU Zheying. Influences of Acid Activators on Properties of Solid Waste Materials and Grouting Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1788-1802.

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