Durability performance of sustainable structural concrete: Effect of coarse crushed concrete aggregate on rapid chloride migration and accelerated corrosion

摘要: Abstract The increasing use of crushed concrete aggregates (CCA), formerly referred to as recycled (RCA), has led research into the effects coarse CCA in higher value structural applications. Concerns exist regarding effect on chloride ion ingress which ultimately can cause deterioration reinforced concrete. This concern is reflected existing European and British design standards limitations prevent their environments where chlorides may be present. rapid migration coefficient rate accelerated corrosion CEM I III/A concretes was measured determine ingress. Three sources were evaluated; results show that generally had a detrimental However, these mitigated by inclusion GGBS produce concretes, thus allowing proportions CCA. It recommended content limited 50% 60% respectively this reduces risk significant also suggest are conservative sustainable with could viable option for future responsibly sourced projects, provided reliable consistent source obtained. positive outcome wider implementation