The use of recycled aggregates in precast non-prestressed and prestressed structural elements
The use of recycled aggregates produced from construction and demolition waste in the production of new concrete provides a sustainable solution that saves land space, reduces the consumption of natural resources, decreases the transportation cost and minimizes the emission of CO2. This has been proven to be technically feasible and economically viable by researchers and practitioners in this field. The aim of this project is to investigate the feasibility of introducing recycled aggregates in precast non-prestressed and prestressed structural elements such as beams, slabs, walls etc. To this end, extensive laboratory tests on the material behaviour of recycling concrete, i.e., concrete with recycled aggregates will be carried out, with focus on the early age and time dependent properties, including the compressive and tensile strength, modulus of elasticity, shrinkage and creep. The effect of various factors (recycled aggregates content, type of cement, mixture proportioning method, water reducing admixtures, mixing approach, curing conditions and adding macro PP fiber) on the development of the material properties of recycling concrete will be comprehensively studied. Models for predicting the time dependent material behaviour of recycling concrete will be developed. Moreover, bond tests (pull out and/or beam tests) between recycling concrete and reinforcement / multi-wire prestressing strand will be performed. Models for describing the bond behaviour between recycling concrete and reinforcement / muli-wire prestressing strand will be formulated.