Rubber Particles From Recycled Tires in Cementitious Composite Materials.
Rubber Particles From Recycled Tires in Cementitious
Huynh, H.; Raghavan, D.; Ferraris, C. F.
NISTIR 5850 R; 23 p. May 1996.
Available from: the authors
building technology; rubber concrete; rubberized mortar;
plastic shrinkage; fibrous rubber; strength; recycled
A possible method for recycling used automobile and
truck tires could be to comminute them and incorporate
the rubber particles into concrete. In a preliminary
investigation, mechanical properties of mortar
containing ground or shredded tires were evaluated. In
this study, two different shapes of rubber particles
were used as constituents of mortar : granules of about
2 mm diameter and shreds having two sizes which were,
nominally, 5.5 mm x 1.2 mm and 10.8 mm x 1.8 mm (length
x diameter). It was found that addition of rubber
granules led to a decrease in both compressive and
flexural strengths of mortar. On the other hand, the
addition of rubber shreds improved some of the
properties of the mortar. In particular, the crack
width and crack length due to plastic shrinkage were
reduced for mortar containing the 10.8 x 1.8 mm rubber
shreds compared with a control mortar without rubber
particles. The mortar containing rubber shreds showed
workability comparable to that of a mortar without
rubber particles. A mortar containing 25.4 mm long and
15 mm diameter polypropylene fibers showed poor
workability compared with a mortar containing rubber
fibers. Although further studies are necessary, it
appears that the incorporation of shredded rubber could
be beneficial for reducing plastic shrinkage crack
development of mortar and probably concrete.