TYRE RUBBER ADDITIVE EFFECT ON CONCRETE MIXTURE STRENGTH

Audrius Grinys,Henrikas Sivilevičius,Mindaugas Daukšys

doi:10.3846/13923730.2012.693536

Abstract

This article describes the observed and examined effect of crumb rubber on the strength (compressive, bending and splitting tensile) of concrete. The tests have shown that the change in the strength of concrete with crumb rubber waste additives can be forecasted from exponential equations. These relationships enable to foresee the regularities of strength properties when a certain amount of crumb rubber of a certain size fraction is added to concrete. The obtained exponential equations show that concrete compressive, flexural and splitting tensile strengths decrease with increasing crumbed rubber additive amount. The testing has also shown that the addition of a small amount of crumbed rubber slightly increases (7%) the tensile splitting strength. The reason is better adhesion of the cement stone with rubber particles compared to the adhesion of sand, which was replaced by crumbed rubber. With higher content of crumbed rubber additive in the concrete, the tensile splitting strength decreases due to the significant increase of entrained air content and lower density.

Highlights

Interaction of several elements of the transport system wears down car wheel tyres and asphalt surfaces or other pavement
The obtained results showed that the splitting tensile strength of concrete modified with mechanically crumbed rubber of different size fractions decreased according to exponential equations (Fig. 10), the correlation factors of which changed in the interval of 0.73...0.90 depending on the size fraction of the additive
Due to low elastic modulus and high deformability of the rubber particles, the compressive, flexural and splitting tensile strengths of concrete decrease by respectively 84%, 72% and 51% when crumbed rubber amount is increased up to 30% of the total aggregate amount

Summary

Introduction

Interaction of several elements of the transport system wears down car wheel tyres and asphalt surfaces or other pavement. When fine aggregate was replaced in full with waste rubber, the authors observed lower reduction in compressive strength (65%) and the same reduction in splitting tensile strength (50%).

Results

Conclusion