废旧混凝土再生材料在沥青混凝土中的稳定化利用研究  

Research on the stable utilization of recycled materials from waste concrete in asphalt concrete

作　　者：郭汝涛 黄选银 马彩霞[2] 张国华 陈宗武 GUO Rutao;HUANG Xuanyin;MA Caixia;ZHANG Guohua;CHEN Zongwu(China Railway Development Investment Group Co.,Ltd.,Kunming 650500,China;School of Arts,Hubei University of Education,Wuhan 430205,China;Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China)

机构地区：[1]中铁开发投资集团有限公司,云南昆明650500 [2]湖北第二师范学院艺术学院,湖北武汉430205 [3]中国地质大学(武汉)工程学院,湖北武汉430074 [4]中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室,北京100024

出　　处：《安全与环境工程》2024年第3期138-149,共12页Safety and Environmental Engineering

基　　金：国家自然科学基金面上项目(42277173);湖北省教育厅科研项目(B2021003);武汉市知识创新专项-曙光计划项目(2023020201020344);绿色建筑材料国家重点实验室开放课题项目(2021GBM03)。

摘　　要：为实现废旧混凝土的便捷、高效再利用,在分析不同粒径范围再生材料的宏、微观性质特征及其沥青混凝土主要工程性能的基础上,确定可克服再生粗骨料性质缺陷的再生材料适用粒径范围以及该粒径范围再生材料在沥青混凝土中的利用方案。结果表明:随着再生材料粒径的减小,由砂浆-碎石界面间隙、裂缝以及砂浆层内部孔隙、裂纹引起的再生粗骨料材料性质不佳以及性质变异性大的问题得到了显著改善,尤其当再生材料以粉状存在时,其材料性质非常均匀,因此建议将废旧混凝土以再生粉料的形式进行循环利用;引入高碱性水泥与再生粉料配合使用可消除再生粉料因SiO_(2)含量较高对沥青混凝土性能潜在的不利影响,再生粉料与水泥体积比为3∶1时可制备出水稳定性、高低温性能以及疲劳性能均满足《公路沥青路面施工技术规范》(JTG F40—2004)要求的沥青混凝土。To realize the convenient and efficient utilization of waste concrete, based on the analysis results of the macro and micro properties of recycled materials with different particle size ranges and the main engineering performance of their asphalt concrete, the suitable particle size range of recycled materials that can overcome the property defects of RCA and the suitable utilization plan of recycled materials in asphalt concrete within this particle size range are determined.The results indicate that the poor material properties and large variability of material properties of RCA,caused by the gaps and cracks at the interface between mortar and crush aggregate, as well as internal pores and cracks in the mortar layer, are significantly improved with the decrease of the particle size of recycled materials.Especially when recycled materials exist in powder form, the material properties are very uniform.Therefore, it is recommended to reuse the waste concrete in the form of recycled powder.The combined use of high alkaline cement and recycled powder can eliminate the potential adverse effect of high SiO_(2) content in recycled powder on the performance of asphalt concrete.When the volume ratio of recycled powder to cement is 3:1,asphalt concrete can be prepared with water stability, high and low temperature performance, and fatigue performance that meet the requirements of the Technical Specification for Highway Asphalt Pavement Construction(JTG F40—2004).

关 键 词：废旧混凝土 再生骨料 再生粉料 沥青混凝土 稳定化利用 

分 类 号：X948[环境科学与工程—安全科学] TU528[建筑科学—建筑技术科学]