Mesolevel Numerical Simulation on Mechanical Properties of Modeled Recycled Concrete Under Uniaxial Compression

Abstract:

A modeled recycled concrete is proposed.According to the meso and microlevel mechanics parameters and constitutive relationships of the fivephase medium materials of recycled concrete,the failure mechanism of recycled concrete is numerically simulated.An investigation is made into the replacement of recycled coarse aggregate,the strength of the new or old hardened cement paste,the thickness of the old hardened cement paste,and the strength of interfacial transition zone (ITZ) on the mechanical properties of modeled recycled concrete under uniaxial compression.The results indicate that the strength of the new and old hardened cement paste have a remarkable influence on the initial elastic modulus and peak stress.The thickness of the old cement paste has some certain influence on the initial elastic modulus and peak strain.Furthermore,the influence of the strength of interfacial transition zones on the initial elastic modulus,peak stress and peak strain is not distinctive.

Key words:modeled recycled concrete; mesolevel; uniaxial compression; numerical simulation; stressstrain relationship