无机胶凝材料改性脱硫建筑石膏性能研究

摘要/Abstract

摘要： 循环流化床(CFB)灰渣具有良好的火山灰性,以脱硫建筑石膏为主要胶凝材料,电石渣为碱激发剂,CFB灰渣和粉煤灰为矿物掺和料,研究CFB灰渣对脱硫建筑石膏流动度、凝结时间、抗压强度、膨胀率等性能的影响规律,并借助X射线衍射(XRD)、扫描电子显微镜(SEM)等手段分析其水化产物和微观形貌。结果表明,掺入CFB灰渣可以有效提高脱硫建筑石膏的力学性能和耐水性能,但对工作性能和膨胀性能有负面影响。经20%(质量分数)CFB飞灰、5%(质量分数)电石渣复合改性后,脱硫建筑石膏的1、28 d绝干抗压强度分别为20.53、22.37 MPa,较脱硫建筑石膏基样分别增加了28.6%、35.9%。CFB灰渣水化生成的水化硅酸钙(C-S-H)凝胶和钙矾石(AFt)包裹并填充于二水石膏晶体表面及空隙中,使硬化体内部结构更加密实,从而提高了脱硫建筑石膏的力学性能和耐水性能。

关键词: 脱硫建筑石膏, CFB飞灰, CFB炉渣, 力学性能, 膨胀性能, 微观形貌

Abstract: Circulating fluidized bed (CFB) ash has good volcanic ash properties, desulfurization building gypsum was used as the main cementitious material, carbide slag was used as an alkali activator, CFB ash and fly ash were used as mineral additives to study the effect of CFB ash on the fluidity, setting time, compressive strength and expansion rate of desulfurization building gypsum. The hydration products and microstructure were analyzed by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and other methods. The results show that adding CFB ash can effectively improve the mechanical property and water resistance of desulfurization building gypsum, but it has a negative impact on its workability and expansiveness. After composite modification with 20% (mass fraction) CFB fly ash and 5% (mass fraction) carbide slag, the absolute dry compressive strength of desulfurization building gypsum at 1 and 28 d is 20.53 and 22.37 MPa, which increases by 28.6% and 35.9% compared to desulfurization building gypsum based samples, respectively. The calcium silicate hydrate (C-S-H) gel and ettringite (AFt) generated from the hydration of CFB ash are wrapped and filled in the crystal surface and voids of dihydrate gypsum, making the internal structure of the hardened body more compact, thus improving the mechanical property and water resistance of desulfurization building gypsum.

Key words: desulfurization building gysum, CFB fly ash, CFB slag, mechanical property, expansiveness, microstructure

中图分类号:

TQ177

单俊鸿, 张泽, 高鹏, 王奎. 无机胶凝材料改性脱硫建筑石膏性能研究[J]. 硅酸盐通报, 2024, 43(1): 268-275.

SHAN Junhong, ZHANG Ze, GAO Peng, WANG Kui. Performance of Desulfurization Building Gypsum Modified by Inorganic Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 268-275.

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