The Performance of Coal Gasification Coarse Slag-weathered Sand Composite Fine Aggregate Concrete  

作　　者：DING Rui TIAN Hao LI Han WANG Hongen CHEN Yuqi LI Wenfu 丁锐

机构地区：[1]Key Laboratory for Comprehensive Energy Saving of Cold Regions Architecture of Ministry of Education,Jilin Jianzhu University,Changchun 130118,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2025年第2期558-567,共10页武汉理工大学学报(材料科学英文版)

基　　金：Funded by the Scientific Research Program of Jilin Provincial Department of Education(No.JJKH20250981KJ)。

摘　　要：CGCS(coal gasification coarse slag)and desert sand composite aggregate replacing river sand for the preparation of concrete(coal gasification coarse slag and desert sand composite fine aggregate concrete,abbreviated as CDFC)were investigated to study the effect of different CGCS dosages,the sand rate of concrete,and the dosage of fly ash(FA)in cementitious material on the mechanical properties of the concrete and the excessive zone at the aggregate interface.The experimental results show that,with the increase of CGCS admixture,the CDFC water-cement ratio decreases,and the strength shows first increase and then decrease;with the increase of concrete sand rate,the CDFC strength shows first increase and then decrease,and with the increase of FA,the CDFC strength shows first increase and then decrease,when the dosage of cementitious material is 360 kg/m^(3),the composite fine aggregate dosage is 872 kg/m^(3),and the coarse aggregate dosage is 983 kg/m^(3),the maximum compressive strength of its CGCS is 47.4 MPa.The microstructures of CGCS and hydration products were analyzed by X-ray fluorescence spectrometry(XRF),X-ray diffraction(XRD),Fourier transform infrared spectrometry(FTIR),and scanning electron microscopy(SEM).It is found that the CDFC as fine aggregate can generate hydration products such as hydrated calcium silicate gel(C-S-H)in the transition zone of the concrete interface,which can greatly improve the weak zones of the concrete,and improve the strength.

关 键 词：coal gasification coarse slag concrete microstructure mechanical properties HYDRATION 

分 类 号：TU5[建筑科学—建筑技术科学]