Massive amounts of brick waste are obtained from demolition of old buildings\nand structures around the world. With the increased stress on sustainable\nconstruction, and environmentally friendly materials and greener concreting\npractices, a large proportion of such waste bricks are crushed and mixed with\nnormal aggregates for use in concrete. The performance of concrete containing\nwaste brick aggregates partially replacing normal aggregates have not been\ninvestigated for their performance. This paper covers investigations carried\nout on concrete with such aggregates obtained from demolition waste and\nmixed with varying proportions of normal aggregates to produce concrete.\nTwo types of crushed brick aggregates were mixed with gravel in the ratios of\n30:70 and 40:60 by weight and specimen were cast for investigations. Two w/c\nratios were investigated. Various tests were carried out to assess the compressive\nstrength of cubes and cylinders of mixed aggregates concrete along with\nf1exural strength, stress/strain behavior, moduli of elasticity, ultrasonic pulse\nvelocity determination, densities, surface absorption, shrinkage and frost resistance.\nThe values obtained from these tests were compared with the values\nof concrete with normal aggregates (gravel) with similar w/c ratios. While the\nstrength tests and durability tests more or less gave satisfactory results however\nthe larger moisture absorption by the waste brick aggregates reduces the\nfrost resistance capacity somewhat thereby care needs to be exercised in using\nthese mixes in regions/areas susceptible to frost.
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