Production of self-compacting concrete with expanded clay and rubber residue -lightweight aggregates

Reference Presenter Authors
09-043 Luisa Andreia Gachet-Barbosa Gachet-Barbosa, L.A.(Universidade Estadual de Campinas); Lintz, R.C.(Universidade Estadual de Campinas); Angelin, A.F.(Universidade Estadual de Campinas); Lightweight self-compacting concrete presents itself as an innovative material due to its low density and high workability. However, the raw materials for its production are from finite natural sources, representing an environmental problem. In this research the expanded clay and the rubber residue of inservable tires were used for the production of concretes. Expanded clay was used as the coarse aggregate, while rubber replaced up to 15% of the aggregate. In the fresh state the tests of scattering, passing ability and viscosity were carried out. Compressive strength, modulus of elasticity, specific mass, water absorption and voids percentagens were the tests performed in the hardened state. It was also performed the collection of microscopic images for analysis of the aggregate-matrix transition zone. The joint use of the lightweight aggregates produced a concrete with high workability and low density, however with the increase of the percentage of rubber there was a decrease of the mechanical resistances. However, the use of these materials in prefabricated pieces with high density of hardware, which require lightness and speed in the execution, have proved favorable, besides corroborating with the correct destination of the rubber residue.
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