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

作　　者：李卫红 郭文斌 郭向兵 陈潇[2] 周明凯[2] LI Weihong;GUO Wenbin;GUO Xiangbing;CHEN Xiao;ZHOU Mingkai(Shanxi Lishi-Xixian Expressway Co.,Ltd.,Lvliang 033400,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[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

出　　处：《硅酸盐通报》2024年第7期2530-2538,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52272025)。

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/m^(3)、CFB飞灰120 kg/m^(3)、矿粉40 kg/m^(3)、CFB炉渣620 kg/m^(3)、碎石1 013 kg/m^(3)、水223 kg/m^(3)、减水剂8.8 kg/m^(3);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。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/m^(3),CFB ash 120 kg/m^(3),mineral powder 40 kg/m^(3),CFB slag 620 kg/m^(3),gravel 1013 kg/m^(3),water 223 kg/m^(3),water reducing agent 8.8 kg/m^(3).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.

关 键 词：CFB灰渣 坍落度 抗压强度 耐久性 配合比 工程应用 

分 类 号：U417.4[交通运输工程—道路与铁道工程]