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
