Properties of Cement Mortar Incorporating Crumb Rubber in Varying Replacement Levels with Cementitious Material

Abstract

Over the past several decades, lifestyle changes have resulted in an increase in waste types and quantities. Waste is currently regarded as one of the world's most challenging issues. The growth in the production of rubber tires has resulted in a rise in the amount of waste rubber materials.Therefore, the incorporation of waste into structural and nonstructural features has been primarily researched in renderings.Also, To reduce the possible issues associated with waste tires and Portland cement's greenhouse gas emissions. Yet, nothing is known about the impact of employing crumb rubber from recycled tires in mortars. This paper studies the different properties of cement mortar, containing different percentages of crumb rubber (CR 5,10,15,20,25, and 30 %) as a volumetric  replacement of fine aggregate. As a replacement for cement, the addition of silica fume (10 %) and fly ash (20 %) by weight of cement.According to the results, the incorporation of CR was responsible for dropping the compressive, flexural, and tensile strength down; however, the use of cementitious materials significantly decreased the severity of this problem.The water absorption increased as the substitution portion increased; as the replacement Ratio in mortar cement increases, the density drops. Also, shrinking increases as the amount of rubber increases.