Published Online: 11 October 2013
Page Count: 20
Ph.D. Candidate, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC
Rangaraju, Prasada Rao
Associate Professor, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC
(Received 25 December 2012; accepted 23 September 2013)
Scrap tires from automobiles create a significant waste stream all over the world, and their disposal needs a viable and environmentally friendly solution. Past research shows that the inclusion of rubber aggregates in concrete reduces its strength but may be useful for improving durability properties such as the freeze-thaw resistance of the concrete; however, comprehensive assessments of the size effects and ideal rubber type have not been fully undertaken. With an understanding of the factors that enable rubber particles to improve the freeze-thaw resistance of concrete, issues such as instability and loss of entrained air in conventionally air-entrained concretes may be addressed. In this study, we assessed the freeze-thaw durability of rubberized Portland cement concrete with the addition of two types of crumb rubber aggregates created via ambient and cryogenic processes. Also, three different sizes of crumb rubber aggregates at three different replacement levels, 8 %, 16 %, and 24 % by volume of fine aggregates, were used for concrete specimens. The results were compared with non-air-entrained concrete as well as air-entrained concrete without added rubber. Based on this investigation, it was concluded that the finer-sized particles of both types of crumb rubber at 16 % and 24 % replacement levels showed very good performance in improving the freeze-thaw durability of concrete without the need for conventional air entrainment.
Paper ID: ACEM20120057