Long-term durability of self-compacting high-performance concrete produced with waste materials

Durability tests for twenty-one self-compacting high-performance concrete (SCHPC) mixtures have been conducted to investigate the impact of using coarse recycled concrete aggregate (RCA) and three other unprocessed waste powder materials: unprocessed waste fly ash (UWFA), waste perlite powder (WPP) and waste cellular concrete powder (WCCP). Chloride migration, water penetration and absorption, freeze/thaw resistance have been investigated at different ages up to 270 days and the results showed that using RCA has no significant effect on the durability properties of SCHPC when used up to 50%. Concretes produced using UWFA or WPP as a replacement of cement mass up to 15% showed excellent durability performance regardless if the coarse aggregate used was natural aggregate (NA) or RCA. SCHPC proved it can be produced as a green concrete, where the pozzolanic activity and the amorphous waste powder materials help the concrete resist aggressive environments. Using WCCP is not recommended for the purpose of enhancing the durability of SCHPC, as well as excessive replacement amounts of either WPP or UWFA. In general, the effects of both WPP and UWFA on durability properties became more significant due to the hydration proceeding with age. (C) 2019 Published by Elsevier Ltd.