同级配下高碳铬铁渣骨料对混凝土性能的影响研究  

Research on the Influence of High-carbon Ferrochromium Slag Aggregate on the Properties of Concrete Under the Same Gradation

作　　者：黄鹏宇 周永祥 冷发光 贺阳 孔亚宁 杨文 高育欣 HUANG Pengyu;ZHOU Yongxiang;LENG Faguang;HE Yang;KONG Yaning;YANG Wen;GAO Yuxin(China West Construction Academy of Building Materials,Chengdu 610213,China;China Academy of Building Research,Beijing 100013,China)

机构地区：[1]中建西部建设建材科学研究院有限公司,成都610213 [2]中国建筑科学研究院有限公司,北京100013

出　　处：《材料导报》2024年第22期207-213,共7页Materials Reports

基　　金：国家自然科学基金(52234004);长江水利委员会长江科学研究院开放研究基金资助项目(CKMV2021878/KY);中建股份科技研发课题(CSCEC-2022-Z-21)。

摘　　要：高碳铬铁渣属于大宗固废,是一种大量堆积、亟需处理的工业冶炼废渣。将铬铁渣用作骨料制备绿色混凝土是一种很好的消纳方式。为了解铬铁渣自身材料特性对混凝土性能的影响,本工作调整铬铁渣骨料级配和天然砂石一致,研究铬铁渣骨料对混凝土拌合物流动性能、力学性能、抗氯离子渗透性能和微观结构的影响,并基于不同的养护方式分析了铬铁渣的界面活性。结果表明:铬铁渣表面粗糙多开口孔,在相同骨料级配下,铬铁渣取代天然骨料后,对混凝土拌合物流动性能有不利影响,但提高了混凝土的抗压强度、劈裂抗拉强度、抗氯离子渗透性能,并对混凝土界面过渡区微结构有一定的改善作用。此外,铬铁渣表面存在少量低活性物质,在压蒸情况下或者水化后期会参与反应。High carbon ferrochromium slag is a kind of industrial smelting waste slag which is accumulated in large quantities and needs to be disposed of urgently.Using ferrochromium slag as aggregate to prepare green concrete is a promising approach to its consumption.In order to explore the influence of the material properties of ferrochromium slag on the performance of concrete,this study adjusts the aggregate gradation of ferrochromium slag to be consistent with natural sand and gravel,and studies the influence of ferrochromium slag aggregate on the flow performance,mechanical properties,chloride ion permeability resistance and microstructure of concrete.Meanwhile,based on different curing methods,the interfacial activity of ferrochromium slag was analyzed.The results show that the surface of ferrochromium slag is rough and has many open pores,under the same aggregate gradation,the replacement of natural aggregate by ferrochromium slag has an adverse effect on the flow properties of concrete mixtures,but it improves the compressive strength,the splitting tensile strength and the resistance to chloride ion permeability of concrete,and also have a certain improvement on the interface transition zone of concrete.In addition,ferrochromium slag has a certain improvement effect on the microstructure of the interface transition zone of concrete,and there are a small amount of low active substances on the surface of ferrochromium slag,which will participate in the reaction in the case of autoclave or later hydration.

关 键 词：高碳铬铁渣 骨料级配 混凝土性能 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]