Abstract
In order to meet the socio-economic demands around the globe, construction industry not only consumes concrete at a very fast pace but also yields huge amounts of construction and demolishing waste. The phenomenon gives rise to environmental issues due to production of concrete ingredients and due to dumping of the waste. Therefore, one of the solutions is the production of green concrete utilizing demolished waste. This research work studies the effect of prolonged fire (18 hours) on the flexural behavior of reinforced concrete–recycled aggregate beams. The beams were using 50% replacement of natural coarse aggregates with demolished concrete. The beam samples were cast as both normal and rich mix concrete and were cured for 28 days. After curing, the beams were exposed to fire at 1000°C in a purpose made oven, followed by testing in a universal load testing machine under central point load. The test results show that the proposed beams (cast with rich mix) exhibited about 22% reduction in flexural strength. The failure mode of the beams was observed as shear failure.
Highlights
Fire is one hazard a structure may face during its lifetime
The discussion above shows the importance of the subject and the variation in results and exploration of the parameters for different condition, which motivated this project on the evaluation of the effects of fire on reinforced concrete beams made with partial replacement of natural coarse aggregates with demolished concrete exposed to prolonged 18hour fire
The obtained results for the beams cast with all-natural coarse aggregates (G1) and 50% recyclable aggregates (G2), with normal mix are given in Tables I and II respectively
Summary
Fire is one hazard a structure may face during its lifetime. It affects a structure’s appearance, and deteriorates its strength. Authors in [4, 13] used different dosages of demolishing waste in making concrete cubes for strength checking after exposing to fire at 1000°C for different durations They observed that at 50% replacement of the natural coarse aggregates, the compressive strength of the concrete is within acceptable limits. Authors in [8] used ilmenite and baryte concretes for the study of the effects of fire on heavy weight concrete used in nuclear structures as shield, and investigated the strength after exposing the samples in fire for 1 to 3 hours at 250°C to 950°C. The discussion above shows the importance of the subject and the variation in results and exploration of the parameters for different condition, which motivated this project on the evaluation of the effects of fire on reinforced concrete beams made with partial replacement of natural coarse aggregates with demolished concrete exposed to prolonged 18hour fire
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