循环流化床固硫灰-矿粉复合胶凝材料的性能、水化产物及其应用

doi:10.16552/j.cnki.issn1001-1625.2024.1022

摘要/Abstract

摘要： 循环流化床固硫灰(CFBFA)造成的资源浪费和环境污染问题日益严重,对其资源化利用迫在眉睫。本文采用电石渣(CS)和脱硫石膏(DG)协同激发CFBFA和矿粉(GBFS),制备低碳胶凝材料并应用于路面混凝土。研究表明,随着CFBFA掺量的增加,CFBFA-GBFS复合胶凝材料3、7 d力学强度呈逐渐降低的趋势,28 d力学强度呈先增大后减小的趋势。当CFBFA掺量为40%(质量分数,下同)时,CFBFA-GBFS复合胶凝材料28 d抗折强度、抗压强度最高,分别为7.4和32.8 MPa。当CFBFA掺量由30%提高到70%时,CFBFA-GBFS复合胶凝材料的初凝时间由447 min延长到753 min,终凝时间由549 min延长到802 min。试件28 d干缩率在CFBFA掺量为50%时最大,为0.031%。CFBFA-GBFS复合胶凝材料的水化产物主要有水化硅铝酸钙(C-A-S-H)凝胶和钙矾石(AFt)。C-A-S-H凝胶和针棒状AFt在空间交错生长,细化材料内部孔隙,有利于强度的提高。采用CFBFA掺量为30%的胶凝材料制备路面混凝土,路面混凝土的28 d弯拉强度和抗压强度分别可达到4.8和43.0 MPa,达到了中级荷载路面混凝土的标准。

关键词: 循环流化床固硫灰, 力学性能, 水化特性, 路面混凝土, 协同激发

Abstract: The problem of resource waste and environmental pollution caused by circulating fluidized bed fly ash (CFBFA) is becoming increasingly acute, and its resource utilization is imminent. In this paper, carbide slag (CS) and desulfurized gypsum (DG) were used to synergistically activate CFBFA and granulated blast furnace slag (GBFS) to prepare low-carbon cementitious materials and apply them to pavement concrete. The results indicate that with the increase of CFBFA content, the mechanical strength of CFBFA-GBFS composite cementitious materials at 3 and 7 d decreases gradually. At the age of 28 d, the mechanical strength of CFBFA-GBFS composite cementitious materials initially increases and subsequently decreases. When the CFBFA content is 40% (mass fraction, the same below), the 28 d flexural strength and compressive strength of CFBFA-GBFS composite cementitious materials are the highest, which are 7.4 and 32.8 MPa, respectively. When the CFBFA content is increased from 30% to 70%, the initial setting time of CFBFA-GBFS composite cementitious material is extended from 447 min to 753 min, and the final setting time is extended from 549 min to 802 min. The 28 d drying shrinkage of the specimen is the largest when the CFBFA content is 50%, which is 0.031%, respectively. The hydration products of CFBFA-GBFS composite cementitious materials mainly include hydrated calcium aluminosilicate (C-A-S-H) gel and ettringite (AFt). The interlaced growth of C-A-S-H gel and needle-like AFt in space refines the internal pores of the material, which is conducive to the improvement of strength. The 28 d flexural tensile strength and compressive strength of pavement concrete can reach 4.8 and 43.0 MPa, respectively, which meet the standard of intermediate load pavement concrete.

Key words: circulating fluidized bed fly ash, mechanical property, hydration characteristic, pavement concrete, synergistic excitation

中图分类号:

TU528
U414

闵锐, 刘馨怡, 杨甜甜, 王思莹, 刘文欢, 李辉. 循环流化床固硫灰-矿粉复合胶凝材料的性能、水化产物及其应用[J]. 硅酸盐通报, 2025, 44(5): 1813-1823.

MIN Rui, LIU Xinyi, YANG Tiantian, WANG Siying, LIU Wenhuan, LI Hui. Properties, Hydration Products and Application of Circulating Fluidized Bed Fly Ash-GBFS Composite Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1813-1823.

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