摘要
提出了一种新的再生骨料改性技术即自磨改性,系统研究了该技术对再生粗骨料和再生混凝土性能的影响规律,探究了再生微粉附着于再生骨料表面时,对再生混凝土工作性能及力学性能的影响规律。结果表明:自磨改性可以有效改善再生粗骨料的粒形和界面形貌,有利于附着表面砂浆层的剥离,改性后再生粗骨料的表观密度提高了9.7%,压碎指标及吸水率分别降低了37.6%和51.4%,改善了再生混凝土的流动性和黏聚性,有效提升了再生混凝土的抗压强度。再生微粉颗粒尺寸小且表面疏松多孔,同时具有微集料填充效应和火山灰活性,对再生混凝土的后期强度具有明显的提升作用。
A new 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.
作者
林一柯
何廷树
达永琪
LIN Yike;HE Tingshu;DA Yongqi(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《材料导报》
CSCD
北大核心
2023年第16期157-162,共6页
Materials Reports
基金
国家自然科学基金(52172027)。
关键词
自磨改性
再生粗骨料
再生混凝土
再生微粉
二次水化
self-grinding modification
recycled coarse aggregate
recycled concrete
recycled micro-powder
second hydration
