2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Mr. M. Tiznobaik, University of Manitoba
Dr. Nemy Banthia, University of British Columbia
Dr. Shahria Alam, University of British Columbia
Owing to the substantially increased demand for natural aggregates in the construction industry, the use of recycled materials as a partial replacement of aggregates in concrete is an environmentally substantial solution. This study in particular focusses on the use of crumb rubber (CR) (0, 10, and 20% by volume) and recycled concrete aggregates (RCA) (0, 50, and 100% by mass) as a partial replacement of natural fine aggregates (NFA) and coarse aggregates (NCA), respectively with an addition of 0.5% polypropylene (PP) fiber by volume of the concrete mix. The flexural behavior of this new concrete with varying combinations of CR, RCA, and PP fiber at different levels was experimentally investigated to determine its modulus of rupture (MOR) and deflection at different loads. Moreover, the post-cracking load-deflection behavior of the PP fiber-reinforced concrete (FRC) beam specimens were captured following the ASTM C1399 standard along with its residual strength measurement under flexure. Results show that, mix RCA100-CR20 with a combination of 100% RCA and 20% CR showed a higher MOR than mix 100-CR10. Also, the PP FRC specimens showed significant post-cracking strength with a maximum residual strength of 2.15 MPa for mix RCA50-CR20-F0.5 with a combination of 50% RCA, 20% CR and 0.5% PP in it.