Effect of Rubber Aggregates from Grinding of End-of-Life Tires on the Properties of SCC

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Title: Effect of Rubber Aggregates from Grinding of End-of-Life Tires on the Properties of SCC

Author(s): M. Garros, A. Turatsinze, and J.-L. Granju

Publication: Special Publication

Volume: 235

Issue:

Appears on pages(s): 177-188

Keywords: brittleness; clean environment; concrete; rubber aggregates; shrinkage; strength

Date: 3/22/2006

Abstract:
Cement-based materials suffer from some imperfections: they are brittle and highly sensitive to cracking, particularly to shrinkage cracking. The idea that nothing improves the durability of concrete structures like an enhanced strain capacity is so widely repeated as to have become a truism. We assumed that partly replacing natural aggregate by rubber aggregates with a low deformation modulus should successfully meet the challenge. This paper therefore focuses on the first results of a study on self-compacting concretes (SCC) incorporating such rubber aggregates. CEM I 52.5R portland cement and natural aggregates with a maximum grain size of 14 mm were used in this investigation. The influence of rubber aggregate content on the properties of the fresh cementitious composites was established. Particularly it was demonstrated that rubber aggregates significantly modified the workability of the fresh concrete: additional admixtures were required to maintain the characteristic properties of SCC when a volume of natural aggregates was replaced by the same volume of rubber aggregates. The detrimental effect of rubber aggregates on the 28-day compressive strength was quantified and the variation of the modulus of deformation versus rubber content was established. The influence of rubber aggregates on shrinkage is also presented.