摘要
配制不同橡胶骨料类型和界面改善的橡胶混凝土,通过试验研究橡胶类型、不同界面改善措施对橡胶混凝土强度、静动弹性模量和材料阻尼比的影响规律,采用微观电镜扫描橡胶混凝土的微观结构形态,分析橡胶混凝土强度、弹性模量下降的原因及阻尼机理。结果表明:橡胶混凝土材料阻尼较普通混凝土增加67.39%~76.09%,动静刚度比提升3.85%~20.19%,具有较好的阻尼耗能和减振效果;不同骨料类型对橡胶混凝土力学性能有一定影响,对阻尼比影响较小,采用NaOH溶液对橡胶骨料预处理有助于橡胶混凝土的强度和弹性模量的提升,采用硅烷偶联剂对橡胶骨料预处理有助于橡胶混凝土材料阻尼比的提升;橡胶骨料的黏弹性、橡胶骨料与其他相之间的刚度差异及界面过渡区强度较低是橡胶混凝土力学性能下降和具有阻尼耗能优势的原因。因此,在对强度、弹性模量要求不是很高但对耗能、减振有特殊需求的领域该材料具有广阔的应用前景,同时还可为国内外废旧轮胎的处理提供经济环保的解决方案。
A variety of crumb rubber concrete specimens with different rubber aggregate types and interface improvements were made. The effects of rubber types and interface improvement measures on the strength, the static and dynamic elastic modulus as well as the material damping ratio of crumb rubber concrete were studied by experiment. The microstructure morphology of crumb rubber concrete was observed by scanning electron microscope(SEM) to analyze the factors causing the decrease in the strength and elastic modulus and the mechanism of damping. Results show that the material damping of crumb rubber concrete is 67.39%~76.09% higher than that of normal concrete, and the dynamic and static stiffness ratio is increased by 3.85%~20.19%, which has better damping energy dissipation and vibration reduction effect. Different aggregate types have certain influence on the mechanical properties of crumb rubber concrete, but have little effect on the damping ratio. The pretreatment of rubber aggregate with NaOH solution contributes to improving the strength and elastic modulus of crumb rubber concrete, and the pretreatment of rubber aggregate with silane coupling agent is beneficial to improving the material damping ratio of crumb rubber concrete. The viscoelasticity of rubber aggregate, the difference in the stiffness between rubber aggregates and other phases, and the low strength of interface transition zone are the reasons for the decrease in the mechanical properties of crumb rubber concrete and the advantage of damping energy dissipation. Consequently, the material has a broad application prospect in fields with low requirements for the strength and elastic modulus but special requirements for energy dissipation and vibration reduction. At the same time, it can also provide economic and environmental protection solutions for the disposal of used tires at home and abroad.
作者
刘保东
冯明扬
林柏欢
柴彦凯
贺文涛
LIU Baodong;FENG Mingyang;LIN Baihuan;CHAI Yankai;HE Wentao(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2019年第6期9-18,共10页
China Railway Science
基金
国家自然科学基金资助项目(51478030)
关键词
橡胶混凝土
骨料类型
界面改善
材料阻尼
力学性能
Crumb rubber concrete
Aggregate type
Interface improvement
Material damping
Mechanical property
