热处理下橡胶混凝土结构及性能演变规律研究

项目名称： 热处理下橡胶混凝土结构及性能演变规律研究

项目编号： No.U1204513

项目类型： 联合基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 张海波

作者单位： 河南理工大学

项目金额： 30万元

中文摘要： 废旧轮胎的处理问题越来越受到国内外关注，以废旧轮胎颗粒为骨料的橡胶混凝土具有诸多优点，但橡胶颗粒的表面惰性导致其与水泥基体的界面结合薄弱，强烈降低橡胶混凝土抗压抗折强度，已有改性方法效果不够理想。申请者在前期研究中发现橡胶砂浆经真空热处理后，抗压抗折强度都有很大提高，橡胶颗粒热解产物可以与硅酸盐玻璃表面发生牢固粘接，这为改善橡胶水泥基体结合提供了新的思路。本项目拟在已有工作基础上，进行热处理作用下橡胶混凝土结构与性能演变的基础研究工作。研究水泥石在热处理作用下结构及性能演变规律，探明橡胶颗粒在热处理作用下基本力学性能演变及热解机理，阐明橡胶热解产物与水泥基体界面浸润粘接机理，揭示橡胶颗粒水泥基体界面过渡区结构演变及橡胶混凝土宏观性能变化规律，形成热处理制度设计方法。此项目将为改善有机颗粒与水泥基体界面结合开辟新的途径，为弹性颗粒有效增韧混凝土提供基础界面理论，理论上和技术上都有极强意义。

中文关键词： 废旧橡胶；混凝土；热处理；机理；力学性能

英文摘要： Reutilization of billions of scraped tyres is concerned seriously around the world. Utilizing scraped tyres as an alternative to conventional aggregates in concrete is a kind of resource saving, environment friendly way for its disposal. Rubber concrete shows many excellent performances, but the low compressive and flexural strength due to poor development of the interfacial transition zone(ITZ) between rubber and cement paste limit its application. The ITZ is one of the crucial factors in controlling the development of strength characteristics, which can be a particular issue in the case of recycled rubber aggregates. It has been suggested that enhancement of bonding in ITZ could be achieved by modifying the surface properties of recycled aggregate. But the inertial surface of waste rubber prevented many modifying approaches to achieve good result. In my former research, it was found that not only the compressive and flexural strength of rubber mortar significantly improved after heat treated in vacuum furnace, but also the pyrolysis products of rubber could firmly adhered to the smooth surface of glass flask, which provides a totally new method(heat treatment) to improve the ITZ between rubber and cement paste. In this project, the changes of structures and properties of rubber concrete before/after heat treat

英文关键词： waste rubber；concrete；heat treatment；mechanism；mechnical property