Study on the Mechanical Properties of Recycled Rubber Mortar

This study mainly focused on adding polyvinyl acetate to modify recycled rubber mortar, solving its defects such as cracking and poor adhesion performance in engineering practice, thereby expanding the application of recycled rubber mortar in housing engineering and further alleviating the harm of waste tire rubber to the ecological environment. Through a series of mechanical experiments, the effects of recycled rubber and polyvinyl acetate contents on the fluidity, flexural and compressive strengths, and drying shrinkage of recycled rubber mortar were studied. The results showed that as the content of recycled rubber particles increased, the fluidity, compressive and flexural strengths of cement mortar significantly decreased, with a reduction amplitude of about 37.3%, 65.1%, and 81.4%, respectively. The volume shrinkage of the specimens increased during drying, with an increase of about 61.8%. When the content of recycled rubber is constant, with the increase of polyvinyl acetate content, the fluidity and volume shrinkage of cement mortar increases by 31.3% and 22.8%, respectively, and the flexural and compressive strengths show a decrease of about 33.1% and 45.5%, respectively. Conclusions from this study will provide useful reference for the application of recycled rubber mortar in housing engineering.