基于两性离子聚合技术的混凝土流变调控及作用机理

项目名称： 基于两性离子聚合技术的混凝土流变调控及作用机理

项目编号： No.51508243

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑环境与结构工程学科

项目作者： 高南箫

作者单位： 江苏省建筑科学研究院有限公司

项目金额： 20万元

中文摘要： 混凝土流变特性的改善是提升高性能混凝土工作性的关键所在，而化学流变改性外加剂是调控混凝土流变特性的核心材料，是解决新拌混凝土大流动性和抗离析性之间矛盾最有效、安全和简便的方法。传统流变调控外加剂难以满足混凝土高性能化的发展需求，而新型聚合物类由于具有分子结构可控性强等诸多优点，成为提升高性能混凝土工作性、力学性及耐久性的新的研究方向。借鉴油田化学领域两性离子聚合物的研究成果，本项目设计合成了系列不同结构的两性离子聚合物，通过阴/阳离子基团种类及比例、功能性侧链及分子量大小等来调控分子结构。针对混凝土内部高盐、高碱的复杂环境，系统研究两性离子聚合物“分子结构—溶液性能—流变特性—混凝土性能”间的关联性规律，建立分子构效关系，并在此基础上探明其流变调控作用机制，进一步发展和完善现有流变调控外加剂的理论基础，为开发高性能流变调控外加剂提供了新途径，也为现代混凝土的高性能化提供了新的技术手段。

中文关键词： 两性离子聚合物；混凝土流变调控；构效关系；作用机理

英文摘要： The rheology property of concrete is one of the most important factors which influence the workability of high-performance concrete. The chemical rheology modified agent is the core material to adjust the rheology property of concrete, and also is the most effective and simple method to solve the contradiction between high fluidity and segregation resistance of fresh concrete. The traditional natural and half synthetic rheology modified agents are difficult to satisfy the fast development of concrete. Afterwards, the synthetic polymers are developed as a new and important direction to improve the workability, mechanical property and durability of high-performance concrete because of their diverse synthetic methods and controllable molecular structure. Draw lessons from oilfield chemistry, a series of amphoteric ion polymers with different chemical structures are synthesized to probe their interaction with concrete. Architecture parameters such as anionic/cationic groups, side chain and molecular weight are regulated to control the molecular structure of amphoteric ion polymer. In view pf the high salt and high alkali environment of concrete, the internal rule and structure-activity relationship of molecular structure, solution property, rheology property and concrete performance are investigated to probe the rheology control mechanism of amphoteric ion polymers. This project might provide a new way for the research and development of rheology modified agent and a new technical method for the fast development of high-performance concrete.

英文关键词： Amphoteric ion polymerization;Rheology regulation of concrete;Structure-activity relationship;mechanism