Characteristics of mortar composed of crushed solid waste of roof tiles as partial replacement of fine aggregate
Hariyadi, Mohammed A. S. Algoul, Ayed Ahmad Zuhud, Jauhar Fajrin

University of Mataram

Abstract

Due to the increasing amount of solid waste from building damage, recycling roof tile waste material as an alternative to sand replacement in mortar is proposed. This research aims to determine the physical and mechanical properties of mortar made of roof tile waste as a partial ingredient in mortar composition. Parameters considered in this study were variations of roof tile used as a partial substitute for sand by weight of 15%, 25%, 35%, and 50%. The specimen used is a cube with dimensions of 5 cm x 5 cm x 5 cm and a testing age of 28 days. Four types of testing were considered namely compressive strength, tensile strength, water absorption, and the mortar density test. Results showed that the unit weight of sand in both loose and solid conditions is greater than the unit weight of the roof tile. While the water absorption of roof tiles is 26.8%, higher than that of sand at 6%. The compressive strength of all roof tile mortar variations was greater than the control mortar^s 13.07 MPa. The tensile strength of mortar generally decreases as the percentage of sand replaced with roof tiles increases. The ratio of tensile strength to compressive strength varies from 1.61% to 2.49%, which is smaller than the ratio of control mortar of 3.9%. The average water absorption for mortar with roof tiles is 8.3%, while the maximum water absorption of 9.4% is obtained at 50% sand replacement. A 35% roof tile composition as a substitute for sand is recommended with a water absorption of 7.7%, and this roof tile almost falls into the category of Type M mortar, which can be used for structural concrete purposes. Finally, it can be concluded that roof tile waste has the potential to be used as a substitute for sand in mortar mixtures.

Keywords: mortar, roof tile, strength, density, water absorption

Topic: Engineering