Investigation of Coarse Aggregate Replacement with Waste Granite and Porcelain Tiles for Production of C-25 Concrete.

Abstract

The utilization of waste materials in concrete production is very much helpful to reach the goal of the sustainable construction. Crushed basaltic stone coarse aggregate serves as one of a conventional concrete aggregate in many countries including Ethiopia. Ethiopia’s construction industry has also faced with an important demand and consumption of natural aggregates for concrete production due to the booming growth of the industry, though high amount of construction wastes are available. The objective of this study was investigating the replacement of coarse aggregate with waste granite and porcelain tiles for C-25 concrete production. In order to achieve the objective, experimental laboratory investigation was conducted. The sample materials for laboratory work were collected, porcelain and granite waste tiles from Jimma palace renovation and new building works. Six types of concrete mixes, independently three specimens per each curing day for 7th, 14th & 28th; totally 108 samples for both compressive cube and tensile split besides the material physical properties test. ASTM standards were used for testing. Based on the results, it showed that the concrete produced with 25% granite tile substitution of basaltic stone coarse aggregate, gave the highest average compressive and tensile split strength next to the control mix and followed by 25% porcelain tile and 75% granite coarse aggregate mix with compressive strength and tensile split strength of 35.79Mpa and 4.07Mpa and 33.21Mpa and 4.05Mpa respectively. While the least compressive and tensile split strength was achieved by a concrete mix produced with porcelain tile of 75% and a granite tile of 25 % with average compressive strength of 32.74Mpa and average tensile split strength of 3.59Mpa at 28 days of curing period. Hence, replacing partially 25% waste granite tile and 25% waste porcelain tile as a coarse aggregate have significant benefit for the structures without affecting the strength, workability and also in reductions of wastes from the environment