Abstract
The results of experimental investigations performed on cement based composites made with addition of recycled rubber as a partial replacement of natural river aggregate are presented in this paper. Different properties of cement based mortar were analyzed, both in fresh and in hardened state. Tested properties in the fresh state included: density, consistency and volume of entrained air. In the hardened state, the following properties were tested: density, mechanical properties (compressive and flexural strength), modulus of elasticity, adhesion to concrete substrate, water absorption, freeze-thaw resistance and ultrasonic pulse velocity. The obtained results indicate that recycled rubber can be successfully applied as a partial replacement of natural river aggregate in cement based composites, in accordance with the sustainable development concept. The investigation showed that physical-mechanical properties of cementituous composites depend to a great extent on the percentage of replacement of natural river aggregate with recycled rubber, especially when the density, strength, adhesion and freeze-thaw resistance are concerned. The best results were obtained in the freeze-thaw resistance of such composites.
Highlights
The results of experimental investigations performed on cement based composites made with addition of recycled rubber as a partial replacement of natural river aggregate are presented in this paper
Increase of incorporated recycled rubber aggregate contributes to the reduction in density and the increase in consistency of the composite, as well as to the percentage of entrained air in the fresh mixture, to some extent
– The use of recycled rubber aggregate increases the porosity of composite, which was concluded after monitoring the ultrasonic pulse velocity through material
Summary
The results of experimental investigations performed on cement based composites made with addition of recycled rubber as a partial replacement of natural river aggregate are presented in this paper. The obtained results indicate that recycled rubber can be successfully applied as a partial replacement of natural river aggregate in cement based composites, in accordance with the sustainable development concept. The investigation showed that physical-mechanical properties of cementituous composites depend to a great extent on the percentage of replacement of natural river aggregate with recycled rubber, especially when the density, strength, adhesion and freeze-thaw resistance are concerned. Concrete and mortar are the most applied construction materials today The advantages of their use are reflected in various aspects, especially in the availability of component materials (binders, aggregates and water), and in the simplicity of their preparation and favorable physical and mechanical properties in the hardened state. According to the Directive EU 1999/31/EC, the disposal of waste tires on landfills is prohibited since 2003, while even the disposal of cut (shredded) tires is prohibited since 2009
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