相变混凝土本构关系及力学-蓄热性能协同优化

Phase change energy storage concrete not only can serve as a functional material to reduce building energy consumption and indoor thermal discomfort, but also can be used as structural materials for building applications. This structural and functional integrated building material has become one of the key directions and focuses of interdisciplinary research among the fields of materials, energy conservation, and buildings. The researches on the constitutive relationship (stress-strain relationship) and the laws of thermoregulation & energy saving of phase change concrete in buildings are the fundamental issues for phase change concrete studies. This research project is given priority to the phase change lightweight aggregate (ceramsite) concrete, and also focuses on other types of phase change concrete as well. The aims of this research are to ascertain the constitutive relationship of phase change concrete and to establish a method for collaborative optimization between structural and functional performances of this concrete type through experimental and numerical simulation studies. In particular, the effect of material characteristics of coarse and fine phase change aggregates on the constitutive relationship of concretes, and the laws of thermoregulation and energy-saving of concretes in buildings will be studied thoroughly. The important significance of this project is to reveal the variation mechanism on the constitutive relationship and the thermal control regulation of phase change concretes. It is believed that the information derived from this comprehensive study will not only provide a solid foundation for engineering application and numerical simulation of phase change concrete, but also provide valuable ideas and guidance for similar studies in the future particularly on the performance improvement and optimization design of other different types of phase change concrete.

相变储能混凝土既能作为功能材料来降低建筑能耗、调节室内热舒适度又能作为结构材料应用于不同的结构构件，这种结构-功能一体化的建筑材料已成为材料、节能和建筑领域交叉研究热点。相变混凝土本构关系（应力-应变关系）和其对建筑中不同形式应用的调温节能规律的研究是相变混凝土的基础研究。本项目研究以相变轻骨料（陶粒）混凝土为主，同时兼顾其他类型的相变混凝土。以弄清相变混凝土本构关系及建立相变混凝土结构性和功能性的协同优化方法为目标；本项目采用实验和数值模拟两种方法开展研究；不仅探索相变粗、细骨料的材料特征对相变混凝土本构关系的影响规律，还深入研究相变混凝土在建筑中的调温节能规律。这对于揭示相变混凝土本构关系和调温规律的影响机理有重要的意义。本研究将为相变储能混凝土在建筑工程的应用和结构-功能性能优化的深入研究奠定基础，为其他类型的相变混凝土的结构性和功能性的后续研究提供有价值的思路及可靠的理论指导。

本项目研究致力于结构混凝土相变储能功能化及其应用的基础研究。通过深入开展系列研究，形成了“轻骨料混凝土 -- 结构/功能一体化相变储能混凝土”的完整研究体系。本项目主要科研成果有：解析了多孔轻骨料对轻骨料混凝土性能的影响机理；获得了相变储能混凝土功能化原理和方法；发表科研论文13篇(SCI收录12篇)；1篇论文进入ESI高被引论文；已授权的发明专利5项。基于本项目的科研成果，在项目开展期间，项目负责人获2018年广东省自然科学奖二等奖（排名1）、2018年深圳市自然科学奖二等奖（排名1）等省部级的科技奖励；获深圳市“鹏城学者”人才称号。