Abstract
Massive amounts of brick waste are obtained from demolition of old buildings and structures around the world. With the increased stress on sustainable construction, and environmentally friendly materials and greener concreting practices, a large proportion of such waste bricks are crushed and mixed with normal aggregates for use in concrete. The performance of concrete containing waste brick aggregates partially replacing normal aggregates have not been investigated for their performance. This paper covers investigations carried out on concrete with such aggregates obtained from demolition waste and mixed with varying proportions of normal aggregates to produce concrete. Two types of crushed brick aggregates were mixed with gravel in the ratios of 30:70 and 40:60 by weight and specimen were cast for investigations. Two w/c ratios were investigated. Various tests were carried out to assess the compressive strength of cubes and cylinders of mixed aggregates concrete along with f1exural strength, stress/strain behavior, moduli of elasticity, ultrasonic pulse velocity determination, densities, surface absorption, shrinkage and frost resistance. The values obtained from these tests were compared with the values of concrete with normal aggregates (gravel) with similar w/c ratios. While the strength tests and durability tests more or less gave satisfactory results however the larger moisture absorption by the waste brick aggregates reduces the frost resistance capacity somewhat thereby care needs to be exercised in using these mixes in regions/areas susceptible to frost.
Highlights
Huge amounts of demolition waste were generated in the world wars
Crushed brick aggregates from bricks obtained from demolition/construction waste are usually added to normal aggregates and used for concreting in many countries there has been no information nor research on the performance of such concrete in which normal aggregates have been partly replaced with crushed waste brick aggregates exists in literature neither any information on acceptable percentages of such waste aggregates to be used in various concrete mixes are evaluated, to keep the resulting concrete properties acceptable, though concrete with 100% crushed brick aggregates have been investigated [1]-[8]
Compressive strength tests on cubes at 7 days and 28 days showed that the rate of development of strength of mixed aggregate concrete was similar to normal aggregate concrete
Summary
Huge amounts of demolition waste were generated in the world wars. After the Second World War, Germans were the first ones to initiate research on use of waste materials in construction. Massive efforts have gone in research on disposal/ recycling of waste products being generated through various processes. Crushed brick aggregates from bricks obtained from demolition/construction waste are usually added to normal aggregates and used for concreting in many countries there has been no information nor research on the performance of such concrete in which normal aggregates have been partly replaced with crushed waste brick aggregates exists in literature neither any information on acceptable percentages of such waste aggregates to be used in various concrete mixes are evaluated, to keep the resulting concrete properties acceptable, though concrete with 100% crushed brick aggregates have been investigated [1]-[8]
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