Cost and Quality Analysis of Bio-Deposited Recycled Aggregates Concrete

Abstract

Abstract: Internationally, the utilization of concrete particularly high-strength concrete has been increasing day-by-day due to rapid industrialization and infrastructural developments. An enormous quantity of natural coarse aggregate is required for making concrete to meet the huge demand. Construction activities mainly depend on natural resources as a source of raw materials, leading to ecological imbalance & the natural resources of coarse aggregate are depleting rapidly all over the world and urgently need to be conserved. On the other hand, millions of tonnes of construction and demolition (C&D) wastes are being generated from different sources. So far the disposal of these huge quantity of (C&D) waste is posing a big problem to the local administration & environment. In this study, recycled aggregates were collected from a 20-30 year old demolished building at the university and recycled into fractions of 1.20 mm~2.45mm and 10 mm~20 mm and replaced for both fine aggregates and coarse aggregates. In this study, by surface treatments on coarse fractions of recycled aggregates were treated by microbes, and the properties of the RAC were studied with the combination of both surface-treated recycled coarse aggregates and un-treated recycled fine aggregates.