亚热带海洋环境下橡胶混凝土轴压及断裂性能的退化机理研究

Rubberized concrete as a kind of environmentally-friendly material, which has many advantages including excellent fatigue performance, good impact resistance and temperature resistance, is widely used in the pavement engineering and the special structure. However, the long-term behavior of rubberized concrete has not yet been well understood, because there is limited research conducted to investigate it. The proposed research project aims to study the long-term degradation mechanism of rubber concrete, especially in the typical subtropical marine climate of southern China. In the first stage, two series of test system, wet-dry cycle (using seawater) and natural environment exposure, will be carried out in the environment, which has the characteristics of typical subtropical climate. Based on the experimental results, the time varying degradation laws of axial compression and fracture properties of rubber concrete will be determined, and both axial compression constitutive model and fracture damage model with time varying will be established by defining the damage tensor of the micro crack zone. A durability fracture model of meso-damage for rubber concrete will be presented. Finally, a reliable and economic method of durability design will be developed for rubber concrete in typical tropical environment of southern China. The proposed design method will also provide valuable references for the design of rubber concrete engineering under similar environment in China and beyond. The accomplishment of this project is hoped to greatly promote the use of rubber concrete engineering, and has important scientific significance to the safety design of rubber concrete and the correct evaluation of its service life.

环保橡胶混凝土具有疲劳及冲击性能好、抗高温爆裂等优点，已广泛应用在路面及特殊结构中。然而，橡胶混凝土的耐久性是人们一直关心亟待解决的重要问题之一。本项目拟探讨亚热带海洋环境对橡胶混凝土长期力学性能退化机理研究。基于环境气候特征，制定橡胶混凝土在干湿循环作用下的加速老化实验条件和自然暴露实验系统；结合实验确定橡胶混凝土轴压及断裂性能的时效退化规律，并通过定义微裂纹区损伤胞元张量建立环境影响下时变轴压本构及断裂损伤退化模型；提出橡胶混凝土细观损伤断裂耐久性仿真分析模型。本项目将为亚热带湿热气候下橡胶混凝土制定一个安全、经济的耐久性设计方法，也为同类气候环境地区橡胶混凝土结构长期性能提供重要的理论依据和实验数据。预期成果将能极大促进橡胶混凝土在工程中的应用，对安全设计橡胶混凝土和正确评估其使用寿命具有重要的科学意义。

环保橡胶混凝土具有疲劳及冲击性能好、抗高温爆裂等优点，已广泛应用在路面及特殊结构中。然而，橡胶混凝土的耐久性是人们一直关心亟待解决的重要问题之一。本项目探讨了亚热带海洋环境对橡胶混凝土长期力学性能退化机理研究。基于环境气候特征，制定了橡胶混凝土在干湿循环作用下的加速老化实验条件和自然暴露实验系统；结合实验确定橡胶混凝土轴压及断裂性能的时效退化规律，并通过定义微裂纹区损伤胞元张量建立环境影响下时变轴压本构及断裂损伤退化模型；提出了橡胶混凝土细观损伤断裂耐久性仿真分析模型。本项目将为亚热带湿热气候下橡胶混凝土制定一个安全、经济的耐久性设计方法，也为同类气候环境地区橡胶混凝土结构长期性能提供重要的理论依据和实验数据。预期成果将能极大促进橡胶混凝土在工程中的应用，对安全设计橡胶混凝土和正确评估其使用寿命具有重要的科学意义。