Uniaxial compressive stress-strain relationship for rubberized concrete with coarse aggregate replacement up to 100%

Abstract

Rubberized concrete (RuC) is a green and environmentally friendly concrete that can be a sustainable production material by replaced mineral aggregate by rubber particles. Rubber particles used for replacing mineral aggregate classified by two types: shredded or chipped rubber as coarse aggregate and crumb rubber as fine aggregate. Mechanical properties and stress-strain curve of rubberized concrete change as mineral aggregate replaced by rubber particles. However, present constitutive stress-strain models for conventional concrete are not valid for rubberized concrete. Also, proposed modified models for rubberized concrete have been done based on limited experimental tests or low volume replacement ratio for coarse aggregate replacement. Therefore, this paper presents an investigation on the mechanical properties of rubberized concrete with volume replacement of coarse aggregate by rubber particles with size larger than 4 mm up to 100%, which represent about 60–65% from total aggregate, after analyzing published experimental tests in the literature for 98 concrete mixes. New equations were proposed to predict the compressive strength, modulus of elasticity, peak strain and compressive stress-strain relationship with taken the volume replacement of coarse aggregate from total aggregate into account. The proposed equations showed reliable prediction of the mechanical properties and compressive stress-strain relationship of the published experimental tests and improved accuracy over existing models.

Keywords

• Rubberized concrete
• Coarse aggregate replacement
• Compressive strength
• Elastic modulus
• Peak strain
• Compressive stress-strain relationship