Abstract
Crushing demolition waste concrete to produce recycled aggregates for production of new concrete is one common means for achieving a more environmentally friendly concrete. In this paper, durability properties such as drying shrinkage, carbonation and long-term exposure up to one year explained in detail. Increase in compressive strength of control and recycled aggregate concrete was around 20% after a exposure period of one year whereas reduction in water absorption were 1.5 and 6%, respectively, for control and recycled aggregate concrete. The carbonation depths and drying shrinkage in the recycled aggregate concrete were higher than conventional concrete. The use of heat treated recycled aggregates and incorporating fly ash/silica fume in addition to cement reduced the carbonation depth and drying shrinkage in concrete. Reduction of carbonation depth and drying shrinkage in recycled aggregate concrete was due to the minimization of pores in recycled aggregate after heating and abrasion treatment and incorporation of fly ash or silica fume in addition to cement in recycled aggregate concrete.
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