CFB灰渣混凝土的组成设计与应用研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (7): 2530-2538.

所属专题：资源综合利用

CFB灰渣混凝土的组成设计与应用研究

李卫红¹, 郭文斌², 郭向兵¹, 陈潇², 周明凯²

1.山西离隰高速公路有限公司,吕梁 033400;
2.武汉理工大学材料科学与工程学院,武汉 430070

收稿日期:2023-12-12 修订日期:2024-02-01 出版日期:2024-07-15 发布日期:2024-07-24
通信作者: 郭文斌,博士研究生。E-mail:429294459@qq.com
作者简介:李卫红(1979—),男,高级工程师。主要从事道路桥梁方面的研究。E-mail:626238963@qq.com
基金资助:
国家自然科学基金(52272025)

Composition Design and Application of CFB Ash-Slag Concrete

LI Weihong¹, GUO Wenbin², GUO Xiangbing¹, CHEN Xiao², ZHOU Mingkai²

1. Shanxi Lishi-Xixian Expressway Co., Ltd., Lvliang 033400, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

Received:2023-12-12 Revised:2024-02-01 Online:2024-07-15 Published:2024-07-24

摘要/Abstract

摘要： 随着循环流化床(CFB)锅炉清洁燃烧技术的大规模应用,所排放的CFB灰渣的处理成为亟待解决的问题。本文以碎石作粗集料、CFB炉渣作细集料以及CFB飞灰作矿物掺合料来制备CFB灰渣混凝土,探讨了CFB炉渣砂率、CFB飞灰掺量对CFB灰渣混凝土的工作性能与力学性能的影响,优化设计了CFB灰渣混凝土配合比,对比研究了CFB灰渣混凝土与机制砂混凝土抗Cl^-渗透性能、抗冻性和干燥收缩等耐久性能,并进行了CFB灰渣混凝土小型预制构件的工程应用。结果表明:随着CFB炉渣砂率的增加,CFB灰渣混凝土的抗压强度先增大后降低,随着CFB飞灰掺量的增加,CFB灰渣混凝土的坍落度逐渐降低,抗压强度先增大后降低,优化的最佳配合比为水泥280 kg/m³、CFB飞灰120 kg/m³、矿粉40 kg/m³、CFB炉渣620 kg/m³、碎石1 013 kg/m³、水223 kg/m³、减水剂8.8 kg/m³;相比于机制砂混凝土,CFB灰渣混凝土具有良好的抗Cl^-渗透性能、抗冻性和较小的干燥收缩,且采用CFB灰渣混凝土制备的小型预制构件在实际工程中具有更好的应用效果。

关键词: CFB灰渣, 坍落度, 抗压强度, 耐久性, 配合比, 工程应用

Abstract: With the large-scale application of clean combustion technology of circulation fluidized bed (CFB) boiler, the disposal CFB ash-slag has become an urgent problem to solve. CFB ash-slag concrete was prepared by using crushed stone as coarse aggregate, CFB slag as fine aggregate and CFB ash as mineral admixture. The effects of CFB slag sand rate and CFB ash content on workability and mechanical properties of CFB ash-slag concrete were discussed, and the mix proportion of CFB ash-slag concrete was optimized. The Cl^- permeability resistance, freeze resistance and dry shrinkage of CFB ash-slag concrete and machine-made sand concrete were compared. The results show that compressive strength of CFB ash-slag concrete first increases and then decreases with the increase of CFB slag sand rate. With the increase of CFB ash content, the slump of CFB ash-slag concrete gradually decreases, and the compressive strength first increases and then decreases. The optimal mix proportion is cement 280 kg/m³, CFB ash 120 kg/m³, mineral powder 40 kg/m³, CFB slag 620 kg/m³, gravel 1 013 kg/m³, water 223 kg/m³, water reducing agent 8.8 kg/m³. Compared with machine-made sand concrete, CFB ash-slag concrete has better Cl^- permeability resistance, freeze resistance and less drying shrinkage, and the small precast components prepared by CFB ash-slag concrete have better application effects in practical engineering.

Key words: CFB ash-slag, slump, compressive strength, durability, mix proportion, engineering application

中图分类号:

U417.4

李卫红, 郭文斌, 郭向兵, 陈潇, 周明凯. CFB灰渣混凝土的组成设计与应用研究[J]. 硅酸盐通报, 2024, 43(7): 2530-2538.

LI Weihong, GUO Wenbin, GUO Xiangbing, CHEN Xiao, ZHOU Mingkai. Composition Design and Application of CFB Ash-Slag Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2530-2538.

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CFB灰渣混凝土的组成设计与应用研究

Composition Design and Application of CFB Ash-Slag Concrete

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