摘要
为揭示振动搅拌技术对水泥稳定碎石强度的影响及作用机理,进行了基于传统搅拌和振动搅拌技术的水泥稳定碎石无侧限抗压强度和间接拉伸强度试验,并开展了扫描电镜下的细观作用机理分析。结果表明:振动搅拌技术可提高水泥稳定碎石的无侧限抗压强度和间接抗拉强度,降低变异系数,提高均匀性,缩短强度稳定时间,对低水泥剂量下强度的改善效果更明显;在龄期为7,28 d时,振动搅拌水泥稳定碎石的水化物明显较多,且分布更均匀,在混合料内部形成了大量韧性较好的网状结构,有利于提高强度;在龄期为90 d时,钙矾石晶体成柱状并嵌入集料内部,使结构更致密,强度更高。
In order to reveal the effect and mechanism of vibration mixing technology on the strength of cement stabilized macadam,the unconfined compressive strength and indirect tensile strength tests of cement stabilized macadam based on the traditional and vibration mixing technologies were carried out.Then,the mesostructure of the cement stabilized macadam was analyzed by the scanning electron microscope.The results show that the unconfined compressive strength and indirect tensile strength of cement stabilized macadam are improved by the vibration mixing technology,while the variation coefficient is decreased,and the homogeneity is improved.Moreover,the stabilization time of the strength is shortened,and the improvement of the strength at low cement content is more obvious.At the ages of 7,28 d,the hydrate is much more and distributes more uniformly in the v ibration mixing cement stabilized macadam,and mang network structures with high toughness are formed,which will improve its strength.At the age of 90 d,columnar ettringite crystals go into the aggregate,making the structures denser and the strength higher.
作者
李雪连
宁佐飞
叶峻宏
王文强
张显安
LI Xue-lian;NING Zuo-fei;YE Jun-hong;WANG Wen-qiang;ZHANG Xian-an(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Foshan Highway and Bridge Construction Co.,Ltd.,Foshan 528000,China;Hubei Traffic Engineering Testing Center Co.,Ltd.,Wuhan 443000,China)
出处
《长沙理工大学学报（自然科学版）》
CAS
2021年第3期8-15,共8页
Journal of Changsha University of Science and Technology:Natural Science
基金
国家自然科学基金资助项目(51308075)。
关键词
道路工程
水泥稳定碎石
振动搅拌
强度
road engineering
cement stabilized macadam
vibration mixing
strength
作者简介
通讯作者:李雪连(1978-),女,副教授,主要从事道路工程材料方面的研究。E-mail:lixuelian@csust.edu.cn。
