Abstract
AbstractThis paper investigates the effect of recycled asphalt pavement (RAP) aggregates on strength properties of fly ash/GGBS alkali-activated concrete (AAC). The raw materials used for the preparation of AAC were ground granulated blast furnace slag (GGBS), fly ash (FLA), sodium hydroxide (SH), sodium silicate (SS), natural and RAP aggregates. The replacement rates of 0, 25, 50 and 75% by weight for natural by RAP aggregates were studied. Fresh and hardened properties of developed AAC were experimentally determined. It was found that workability and density of fresh AAC decreased with inclusion of RAP aggregates. AAC with 75% RAP showed slump and unit weight of 155 mm and 2250 kg/m3, respectively, while 28 days compressive and split-tensile strength were 21 and 1.35 MPa, respectively. Though there was a reduction in strength properties, this study shows that RAP aggregates in AAC can be considered for non-structural applications. Furthermore, it increases the reusability of RAP in paving industry and encourages recycling in an environment-friendly manner.KeywordsRAPAlkali-activatedConcreteCompressive strengthSplit tensile strength
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