Concrete using recycled aggregates from construction and demolition waste and industrial by-products in Vietnam

In recent decades, Vietnam has encountered growing challenges due to the accumulation of construction and demolition waste (CDW) and industrial by-products, including fly ash (FA) and ground granulated blast furnace slag (GGBFS). These materials not only require significant landfill space but also present considerable environmental risks. This study examines the current recycling practices for CDW and industrial by-products in Vietnam and explores their potential application in concrete production. Experimental findings indicate that incorporating recycled aggregates alongside GGBFS (at 40% and 70% cement replacement) and FA (at 20% binder weight) in concrete can make the compressive strength accordance with TCVN 5574:2018 for reinforced concrete. Furthermore, concrete specimens containing 40% GGBFS exhibited superior long-term strength development compared to those with a 70% replacement ratio.