Properties of rubberized cement mortar containing silica fume

• Main Authors: Muzahim, Dhabia Saad, Al-attar, Alyaa abbas
• Format: Conference Proceeding
• Language: English
• Subjects: Cement; Compressive strength; Environmental impact; Flexural strength; Mechanical properties; Mortars (material); Rubber; Silica fume; Splitting; Tensile strength; Tires; Water absorption
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0105414

Currently, increased production of various goods and supplies such as car tires led to an excessive amount of worn tires making disposal a major issue as waste rubber derived from tires are not easily degraded or decomposed therefore many research has been undertaken to use these materials in engineering purposes to reduce their negative environmental impacts such as cement mortar to reduce its adverse environmental influences. this study shows the possibility of using crumb rubber in mortar by partially replacing (5%,9%,13%,17%,21%,25%, and 29%) of fine aggregate by volume, with silica fume included as partial substitution (15%) of cement weight to see their influence on cement mortar properties and comparing their performances with the controlled specimens having no crumb rubber such as water absorption, unit weight, shrinkage, compressive strength, flexural strength and splitting tensile strength with varying rubber replacement levels. The results obtained from the study were that compressive strength, flexural strength, and splitting tensile strength reduce when increasing the rubber content in mortar. In conversely, the incorporation of silica fume into the composite, on the other hand, enhanced the mechanical properties of the mortars and moderated the rate of strength drop. When the substitute fraction was increased, water absorption increased. When the percentage of replacement in mortar cement rises, the density decreases. Also, as the amount of rubber rises, shrinkage decreases.