西安科技大学学报2024，Vol.44Issue(5)：892-900,9.DOI:10.13800/j.cnki.xakjdxxb.2024.0509
脱碳煤气化渣对混凝土强度的影响
Influence of decarburized coal gasification slag on the strength of concrete
摘要
Abstract
In order to solve the problems of land and water pollution and great waste of resources caused by high carbon content gasification slag produced by coal gasification,this paper takes decar-bonized coal gasification slag as admixture,and conducts scanning electron microscopy and fourier transform infrared spectroscopy to analyze the microstructure and the characteristics of the functional groups on its surface.4-factor 5-level orthogonal test was designed,the specimens of decarbonized coal gasification slag concrete was prepared,the effects of decarbonized coal gasification slag on compressive strength of concrete at different ages was explored,and the hydration mechanism of hardened products was examined under the optimum proportion of decarbonized coal gasification slag.A detailed analysis was made of the effect of decarbonized coal gasification slag admixture on the compressive strength of concrete at different ages,with the hydration mechanism of hardening products explored under the opti-mal ratio of concrete mixed with decarbonized coal gasification slag.The results show that:the mixing ratio of water-cement ratio of the decarbonized coal gasification slag concrete is 0.18,silica fume mix-ing for 20％,fly ash mixing for 10％,decarbonized coal gasification slag mixing for 5％,and the con-crete has a better performance.10％or less mixing on the strength of the concrete has a more obvious enhancement,which can be used as an admixture for the preparation of high-strength concrete.At the early stage of hydration,grinding decarbonized coal gasification slag amorphous minerals and cement hydration produced by the reaction of calcium hydroxide to generate a large number of low-crystalline hydrated calcium silicate gel.The decarbonized coal gasification slag surface contains more oxygen-con-taining functional groups,with strong hydrophilicity,to a certain extent,accelerating the hydration reac-tion process.At the late stage of hydration,the highly crystalline calcium alunite and other needle and rod crystals were generated,so that its strength could be enhanced.关键词
脱碳煤气化渣/高强度混凝土/抗压强度/最佳配比/水化机理Key words
decarbonized coal gasification slag/high-strength concrete/compressive strength/optimal proportioning/hydration mechanism分类
资源环境引用本文复制引用
李鹏,杜阳,张军飞..脱碳煤气化渣对混凝土强度的影响[J].西安科技大学学报,2024,44(5):892-900,9.基金项目
辽宁省自然科学基金项目(2021-KF-23-04) （2021-KF-23-04）
