Waste concrete aggregates (WCA) are produced by crushing demolished concrete elements. The lightweight, porous cement mortar attached to WCA causes crushed concrete aggregates to have a lower specific gravity and higher water absorption than comparatively sized fresh aggregates. Due to the booming of real estate business, the amount of waste generation is increasing day by day in Bangladesh. Initially WCA were used as land filling materials and after many research works it is now being utilized as unbound road base material and in non-structural concrete applications. The demand of stone aggregates for the construction of bituminous pavement can be reduced by recycling of WCA as coarse aggregate. But a few researches have been carried out to investigate their suitability and limited information’s are available about their performance. Therefore, this research was carried out to investigate the possibility of using WCA in bituminous mixes. Properties of mineral matters and Marshall test properties of bituminous mixes were ascertained according to the test procedure specified by AASHTO standards. Dense bituminous mixes using WCA compacted with 50 blows is found a feasible option from the standpoint of stability, stiffness, deformations and voids characteristics.
Contributors: Sobhan A, & Rana M M
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