On Recycled Concrete Confined by GFRP Tube Under Axial Compression

Abstract:

Based on tests of 9 recycled concrete specimens confined by glass fiber reinforced plastics (GFRP) tube with different recycled coarse aggregate replacement percentages under axial compression,an investigation was made into the failure properties under compression,axial forcelongitudinal displacement relationship,lateral strain development and variation rule of lateral deformation ratio of the test specimens.It is found that the stressstrain relationship of GFRP confined recycled concrete can be divided into four branches, i.e., the elastic ascending branch,the elastoplastic ascending branch,the descending branch and strainstrengthening branch.The strength and deformation ability of confined recycled concrete are obviously improved than those of unconfined recycled concrete.The slip between the inner recycled concrete and the GFRP tube is negligible,and the lateral deformation ratio of specimens containing recycled aggregates is lower than those without recycled aggregates.