Description : |
This study illustrates the utilization of roof tile waste as a resource in the manufacturing of fired bricks.
Although commonly referred to as demolition waste, it is technically classified as construction and demolition
waste (C&D). This demolition waste was used as a partial replacement of two soils (alluvial and laterite soil)
at three firing temperatures that were considered economical (700, 850, and 900 °C). The waste considered was
obtained from roof tiles previously fired at a low temperature below 800 °C, thus containing residual carbonates
and clay minerals. The increased waste input resulted in higher firing shrinkage, bulk density, and water absorption
while decreasing loss on ignition. An increase in firing temperature led to higher firing shrinkage, loss on ignition,
and bulk density, but lower water absorption. The bricks met both Indian and ASTM standards for 2nd and 3rd class by
adding 20–35 wt% of roof tile waste and firing at 850–900 °C in laboratory and industrial settings. The minimum acceptable
quality for the produced bricks was achieved with an addition of 35 wt% waste, resulting in a water absorption of
approximately 19% and a compressive strength ranging from 6 to 9 MPa. The study suggests that incorporating waste from
demolished roof tiles into the production of burned bricks can be advantageous. It can partially replace the need for soils,
reduce natural resource usage, lower energy consumption during production, and decrease the carbon footprint.
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