Effect of exposure duration on Sustainability of Ternary Blended Recycled Aggregate Self Compacting Concrete Exposed to Real Fire

Abstract

Concrete is a composite blend of cement, aggregates mostly naturally available and water. On the other side, natural aggregates are being depleted by heavy construction activity while industrial and demolish waste is ample to dump. Henceforth this waste can be utilized in concrete resulting sustainable development.  The main purpose of the research work is to assess the sustainability in terms of strength of self compacting concrete, which contain GGBS, Metakaolin, and recycled aggregate from demolished RCC member after real fire exposure for 1-hour and 2-hour durations.  M30 grade Ternary Blended Self-Compacting Concrete (TB SCC) is generated by using natural aggregate. Natural Aggregate (NA) is replaced with 50% of Recycled Aggregate (RA) resulting Ternary Blended Recycled Aggregate Self-Compacting Concrete (TB RA SCC). 10% Portland slag cement is replaced with Metakaolin by its weight. Age consideration for present study is 28 days. The compressive strength is studied on fire affected air cooled and water quenched concrete specimens. From the study it is concluded that, TB SCC and TB RA SCC concrete lost majority of its strength during first 1-hour of fire exposure. On an average the maximum difference in strength loss is 23% between TB SCC NA and TB RA SCC. During real fire exposure TB RA SCC may not be recommended due to absence of sustainability at long durations of exposure