Abstract:
The quantities of ceramic wastes in our nation have been on the increase significantly (approx. 45.9 tonnes
annually in Nairobi) without consideration for potential reuse or recycling, increasing the risk to public health due
to the scarcity of land area. This growing problem can be alleviated if new disposal options other than landfill can
be found. In addition, increased construction activity and continuous dependence on conventional materials of
concrete are also leading to scarcity of these materials resulting to increased construction cost. This study aims at
reviewing the past research work on the use of ceramic waste aggregate as possible partial substitute for
conventional coarse aggregate in concrete. From the review, an optimum mechanical strength of recycled
ceramics in concrete was identified. Recycled ceramics originates mostly from broken or leftover tiles, sanitary and
kitchenware. Two different ceramics were considered as partial substitute for coarse aggregate in concrete under
this review, i.e. crushed clay bricks and tiles. The replacement proportions varied from 0%, 17%, 33%, 50%, and
67% by weight for natural aggregates, while other components kept constant. A detailed analysis of the results of
previous work is presented for concrete design mixes. Final tests results of this work are of importance in assessing
the mechanical properties determined through splitting tensile tests, flexural tests, compressive tests and bond
strength development tests at 7, 14, and 28 days. Tests results showed positive response for mechanical properties
of the new concrete. The review indicates that considerable knowledge and expertise has been accumulated on
the use of waste ceramic products as partial occupant of natural aggregates in concrete technology. This therefore
provides better and efficient recycling and utilization of waste ceramics in our environment.
