再生微粉性能激活研究及应用进展  

Advances in Research of Performance Activation of Recycled Powders and Relevant Applications

作　　者：马昆林[1] 孟维琦 申景涛 胡明文 王晓杰 龙广成[1] 曾晓辉[1] MA Kunlin;MENG Weiqi;SHEN Jingtao;HU Mingwen;WANG Xiaojie;LONG Guangcheng;ZENG Xiaohui(School of Civil Engineering,Central South University,Changsha 410075,China;China Railway Urban Construction Group Co.,Ltd.,Changsha 410208,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中铁城建集团有限公司,长沙410208

出　　处：《材料导报》2024年第10期96-108,共13页Materials Reports

基　　金：长沙市科技计划重点研发项目(kh2005213)。

摘　　要：再生微粉是以混凝土、砖瓦等为主要成分的建筑垃圾制备再生骨料过程中产生的粒径小于75μm的颗粒,其主要化学组成与粉煤灰类似,具有一定的潜在活性。将再生微粉作为掺合料使用,可减少对原材料的需求,减轻对环境的污染,实现资源的循环利用。再生微粉具有组成复杂、需水量大、活性指数低等特点,直接作为掺合料使用不利于砂浆或混凝土的性能,但再生微粉中SiO_(2)、CaO和Al_(2)O_(3)含量均较高,具有较好的活性潜质,经过适当的技术处理后可以有效激发其活性,提高利用效率。目前再生微粉主要激活方式有物理激活、化学激活和热激活。热激活可以燃尽再生微粉中的有机物杂质,改变部分物质组成,从而激发其活性;物理激活通过机械力增大了再生微粉的比表面积,从而提高了再生微粉活性;化学激活主要通过加入碱性激发剂等提供碱性环境或提供可参与反应的离子,从而促进水化程度提高再生微粉活性。相关学者对再生微粉的活性激发方法及其在砂浆和混凝土中的应用进行了深入研究,这对再生微粉的应用具有积极作用。本文基于已有文献资料,对再生微粉的物理性能、化学组成、激活方式、激活机理及应用现状进行了综合评述,分析了目前再生微粉研究存在的问题并展望了其应用前景,以期为再生微粉的高品质利用提供研究基础。Recycled fine powders area kind of particles with particle size less than 75μm produced in the process of preparing recycled aggregate from construction waste with concrete,brick and tile as the main components.Their main chemical composition is similar to that of fly ash and has certain potential activity.The use of recycled fine powders as admixture can reduce the demand for raw materials,reduce the pollution to the environment,and realize the recycling of resources.Recycled fine powders have the characteristics of complex composition,large water demand and low activity index,which are not conducive to the performance of mortar or concrete when used directly as admixture.However,the content of SiO_(2),CaO and Al_(2)O_(3) in recycled fine powders are high,which have a good activity potential.After appropriate technical treatment,it can effectively stimulate their activities and improve the utilization efficiency.The main activation modes of recycled fine powders currently include physical,chemical,and thermal activation.Thermal activation can burn up the organic impurities in the recycled fine powders,and change the composition of some substances,so as to stimulate their activity.Physical activation increases the specific surface area of recycled fine powders by mechanical force,thereby improving the activity of the recycled fine powders.Chemical activation mainly provides an alkaline environment or ions that can participate in the reaction by adding alkaline activators,thus promoting the hydration degree to improve the activity of recycled fine powders.Relevant scholars have conducted in-depth research on the active excitation method of recycled fine powders and its application in mortar and concrete,which has played a positive role in the application of recycled fine powders.Based on the existing literature,this paper comprehensively reviews the physical properties,chemical composition,activation mode,activation mechanism and application status of recycled fine powders,analyses the problems in the current res

关 键 词：建筑垃圾 再生微粉 激活方式 作用机理 应用现状 

分 类 号：TU526[建筑科学—建筑技术科学]