Experimental studies on partial replacement of crumb rubber as a fine aggregate in M30 grade concrete

Abstract

Waste tyre disposal rates are extremely high, posing major environmental issues in society. It is imperative to address the environmental concern surrounding the disposal of this garbage as soon as possible. Therefore, it is necessary to research the effects of partially substituting fine aggregate for waste scraped (crumb) rubber on the concrete. As a result, the properties of concrete with partial substituting fine aggregate by crumb rubber and normal concrete were investigated in this experimental study. M30 concrete is used in this study. The replacement percentages of fine aggregate by crumb rubber were taken as 0%, 5%, 10% 15% and 20%. The specimens were casted, cured and tested against mechanical and durability properties as per IS standard specification. Compressive, split tension and impact strength are tested for arriving mechanical properties. Tension-Compression Ratio (TCR) is arrived to ensure the reduction level of brittlenss of this concrete. For durability properties, water absorption test is conducted. It is found that if crumb rubber is added, the compressive strength reduced and 10% of crumb rubber some amount of gain in impact strength. A regression model is established to relate the compression strength and impact strength of this concrete. However 10% of crumb rubber seems positive approach among the other replacement percentages towards the environmental concern.