摘要
将废旧混凝土用作再生骨料既符合建筑材料绿色可持续发展战略的需求,又能有效减缓天然石材资源逐渐枯竭的问题,但再生骨料的高吸水率及复杂的界面过渡区不可避免地对混凝土力学性能造成不利影响。对再生骨料进行预处理后,研究了再生骨料对粉煤灰再生骨料混凝土力学性能的影响规律及作用机理。结果表明:预浸泡处理保证了浆体中的有效水胶比,并通过内养护方式进一步促进浆体的水化进程,从而有效改善粉煤灰再生骨料混凝土的力学性能。同时,通过抗压强度时变模型验证了粉煤灰再生骨料混凝土力学性能演变规律,有效促进了再生骨料在建筑材料方向的利用。
Using waste concrete as recycled aggregate can effectively avoid the waste of land resources and environmental problems.The application of RA not only meets the needs of green and sustainable development strategies for building materials but also effectively mitigates the depletion of natural stone resources.However,the high water absorption rate and complex interface transition zone of RA inevitably have adverse effects on the mechanical properties of concrete.In this study,the influence mechanism of the substitution of recycled aggregates and the pre-soaking treatment on the mechanical properties of fly ash recycled aggregate concrete were explored.The results indicate that the pre-soaking treatment ensures the effective water-to-binder ratio in the matrix and further promotes the hydration process of the cementitious materials through internal curing,thereby effectively improving the mechanical properties of fly ash recycled aggregate concrete.At the same time,the evolution of mechanical properties of fly ash recycled aggregate concrete was verified through a time-varying compressive strength model,effectively promoting the utilization of RA in the direction of building materials.
作者
陈义国
齐仕杰
纪续
岳红亚
王磊
徐润
CHEN Yiguo;QI Shijie;JI Xu;YUE Hongya;WANG Lei;XU Run(Ji’nan Kinyue Highway Engineering Co.,Ltd.,Ji’nan 250101,China;Shandong Provincial Communications Planning and Design Institute Group Co.,Ltd.,Ji’nan 250101,China)
出处
《粉煤灰综合利用》
2025年第1期13-17,23,共6页
Fly Ash Comprehensive Utilization
基金
山东省自然科学基金青年基金项目(ZR2022QE064)
山东省交通运输厅科技计划项目(2022B03-01)。
关键词
再生骨料
混凝土
力学性能
微观形貌
孔结构
recycled aggregate
concrete
physical properties
micro-morphology
pore structure
