振动拌和对水泥稳定再生骨料性能的影响
Effect of vibration mixing on the performance of cement-stabilized recycled aggregates
袁斯雅 1张育铖 2赵华2
作者信息
- 1. 江西省交通投资集团有限责任公司吉安东管理中心,江西 吉安 343700
- 2. 南昌大学工程建设学院,江西 南昌 330031
- 折叠
摘要
为研究再生粗骨料在水泥稳定再生集料中的应用,提升水泥稳定再生骨料的力学性能,将桥梁拆除产生的建筑废物经破碎后用来制备再生粗骨料,通过与天然细集料配比,优化水泥稳定再生骨料的级配,开发出了一种改良混合物,并探讨了振动拌和与水泥的质量分数对水泥稳定再生骨料性能的影响.研究发现:最优的拌和参数为振动时间30 s,振动频率40 Hz;振动拌和能改善水泥稳定再生骨料的干缩性能、温缩性能与力学性能,可提高水泥稳定再生骨料承受交通荷载的能力;当水泥的质量分数为5%时,振动拌和的水泥稳定再生骨料7 d抗压强度为4.2 MPa,达到我国重交通高速公路对基层的强度要求,同时,水泥的质量分数的增加有利于力学性能的提升,但对干缩性能和温缩性能有着不利影响.
Abstract
To investigate the application of recycled coarse aggregates in cement-stabilized recycled aggregate and enhance the mechanical properties of cement-stabilized recycled aggregates,the construction waste generated from bridge demolition was crushed to prepare recycled coarse aggregates.By optimizing the grading of cement-stabilized recycled aggregates through proportioning with natural fine aggregates,an improved mixture was developed,and the effects of vibration mixing and cement dosage on the performance of the cement-stabilized recycled aggregates were explored.This study found that the optimal mixing parameters were vibration time of 30 s and vibration frequency of 40 Hz.Vibration mixing could improve the drying shrinkage and thermal shrinkage performance of the cement-stabilized recycled aggregates,enhance their mechanical properties,and increase their capacity to withstand traffic loads.For instance,with a cement dosage of 5%,the 7 d compressive strength of the vibration mixed cement-stabilized recycled aggregates reached 4.2 MPa,meeting the strength requirements for the base layer of heavy-traffic highways in China.Simultaneously,an increase in cement dosage further benefited the mechanical properties but adversely affected the drying and thermal shrinkage performance.
关键词
再生骨料/水泥稳定再生骨料/振动拌和/力学性能/收缩性能Key words
recycled aggregate/cement-stabilized recycled aggregate/vibration mixing/mechanical properties/shrinkage properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据