This project will unite the technology experts in China and Pakistan, focus on the seismic performance and life cycle assessment of recycled concrete structure of earthquake prone areas around the two countries’ needs. This project is going to draw the code for design of recycled concrete structure in seismic fortification areas of China and Pakistan, so as to provide effective and clear guidance for the sustainable development of concrete structure of the two countries, to provide technical support for “The Belt and Road” so that promote technical exchanges and cooperation between the two countries.
This project will give fully consideration to the geographical characteristics of the two countries, emphatically research on the damping regulation mechanism, component and structure seismic performance of recycled concrete from the several material properties of recycled concrete including preparation methods, long-term properties and constitutive relationship. This project will also evaluate the environmental and economic benefits of recycled concrete. Ultimately，this project will come up with the technology specification for seismic performance of recycled concrete. The collaboration of this project will be taken place in the following 6 aspects:
1) Preparation and long-term performance of recycled concrete with different geographical characteristics
Research emphasis: source and characteristics of waste concrete in two countries; processing and performance of recycled aggregate; mix proportion design of recycled concrete; mechanical properties of high performance recycled concrete and commercial recycled concrete; carbonization, chloride diffusion and sulfate attack of recycled concrete.
2) Stochastic constitutive relation of recycled concrete
Research emphasis: the influence of recycled aggregate, recycled aggregate replacement rate, the recycled concrete strength grade and strain rate on the process of recycled concrete under uniaxial compression especially peak stress, peak strain, elastic modulus, ultimate strain; dispersion analysis of stress-strain curves of recycled concrete; establishment and application of stochastic constitutive model
3) Damping mechanism and control method of recycled concrete
Research emphasis: Recycled aggregate concrete has the characteristics of high porosity, low density, high water absorption and high crushing index of recycled aggregate. Therefore, recycled aggregate particle size, substitution rate, age and other factors could be selected as parameters to do study on fine microstructure of recycled concrete; damping factors of recycled concrete; effect of fiber content and construction method on damping of recycled concrete; test and analysis method for damping of recycled concrete. Furthermore, the optimal control method of recycled concrete based on damping performance can be established, which provides a theoretical basis for dynamic analysis and design of recycled concrete.
4) Seismic performance of new type recycled concrete components and structures
Research emphasis: By means of pseudo dynamic test and shaking table test, to study the seismic behavior of FRP confined recycled concrete full scale columns and FRP bars reinforced recycled concrete columns (frames) and recycled concrete frame shear walls. Based on the stochastic constitutive analysis and damping analysis of recycled concrete, to establish the numerical simulation analysis theory and calculation method of seismic performance of recycled concrete structures.
5) Evaluation of environmental and economic benefits of recycled concrete structure
Research emphasis: Based on life cycle assessment (LCA), combined with the pilot project, to carry out concrete analysis in the ecological environment and economic benefits of recycled concrete in lifecycle so as to provide a comprehensive basis for the design of the seismic performance of recycled concrete structure and sustainable concrete structure.
6) Technical guidelines for seismic design of recycled concrete structures
Research emphasis: Taking typical infrastructure of both parties concerned as the center, on the basis of the pilot project of joint determination of field test results, to carry out the research on concrete structure design process, control parameters, design method, construction method and construction process of regeneration, and then drafting technical guidelines.
The participate institution in China in this project: Tongji University, Beijing Jiaotong University.
Group leader in China: Prof. Xiao Jianzhuang (Tongji University), Prof. Wang Yuanfeng (Beijing Jiaotong University)
The group leaders of the Chinese research team and the Pakistani research team are responsible for the overall arrangement of decision-making, implementation and daily work, and ensure the normal arrangement and deplo
