Mechanical behavior of self-compacting concrete pavements incorporating recycled tire rubber crumb and reinforced with polypropylene fiber

摘要

Increasing quantity of scrap tires are potential sources of fire and health hazards. Rubberized pavement is being considered as one of the promising and sustainable solutions to this current environmental and economic crisis in the world. This research focused on finding the best way of producing paving concrete with the use of tire rubber waste as a component material. Therefore, Tire Rubber Crumb (TRC) was used as a partial sand replacement (5%, 10% and 15%) material in the mix design of self-compacting concrete. Self-compacting concrete (SCC) is considered an energy efficient material; because it reduces on-site working and does not need any compacting energy. Fine aggregates with fineness modulus of 2.9, specific gravity of 2.64 (g/cm(3)) and water absorption of 1.5% and coarse aggregates with maximum size of 12.7 mm, specific gravity of 2.68 (g/cm(3)) and water absorption of 0.8 were used in this research. According to the results of this study, fresh concrete tests showed that both fiber and TRC have negative effects on rheological properties of fresh concrete. Furthermore, the hardened concrete tests showed that TRC decreases compressive strength, tensile strength, flexural strength, abrasive strength and modulus of elasticity while increasing water absorption of SCC. Therefore, polypropylene fibers were added into SCC specimens containing TRC and resulted in significant increases in compressive, tensile, flexural and abrasion strength but had no considerable effect on the modulus of elasticity of these specimens. Moreover, the presence of fiber in rubberized SCC decreased water absorption based on evaluation of ultrasonic waves velocity. (C) 2016 Elsevier Ltd. All rights reserved.