Abstract: Anew modification technology (self-grinding modification) of recycled coarse aggregate was proposed. The influence laws of self-grinding modification on the properties of recycled coarse aggregate and recycled concrete were systematically studied, the influence laws of the recycled micro-powder on the workability and mechanical properties of recycled concrete when it adhered to the surface of recycled aggregate was explored. The results revealed that the self-grinding modification could effectively improve the particle shape and the interface morphology of recycled coarse aggregate, which is benefit to the stripping of the attached mortar on the surface. After modification, the apparent density of recycled coarse aggregate was increased by 9.7%, the crushing index and water absorption are reduced by 37.6% and 51.4% respectively, the fluidity and cohesion of the prepared recycled concrete were improved, and the compressive strength of recycled concrete was effectively enhanced. Recycled micro-powders had the small particles, loose and porous surface, and it presented the micro-aggregate filling effect and pozzolanic activity, which could effectively improve the later compressive strength of recycled concrete.
通讯作者: *何廷树,西安建筑科技大学材料科学与工程学院教授、博士研究生导师。1987年北京钢铁学院矿物加工工程专业本科毕业,1990年北京科技大学矿物加工工程专业硕士毕业后到西安建筑科技大学工作至今,1996年东北大学矿物加工工程专业博士毕业。目前主要从事高强高性能混凝土、混凝土外加剂及固体废弃物资源化利用的研究工作。发表论文200余篇,包括Journal of Hazardous Mate-rials、Journal of Cleaner Production、Construction and Building Materials、Journal of Alloys and Compounds等。hetingshu@xauat.edu.cn
林一柯, 何廷树, 达永琪. 自磨改性对再生粗骨料及再生混凝土性能的影响[J]. 材料导报, 2023, 37(16): 22020144-6.
LIN Yike, HE Tingshu, DA Yongqi. Influence of Self-grinding Modification on the Properties of Recycled Coarse Aggregate and Recycled Concrete. Materials Reports, 2023, 37(16): 22020144-6.
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2023, Vol. 37 
