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Abstract:
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Concrete is a universal material in the construction industry. With natural
resources like sand and aggregate, fast depleting, it is time to look for alternate
materials to substitute these in the process of making concrete. There are instances
like exposure to solar radiation, fire, furnaces, and nuclear reactor vessels, special
applications like missile launching pads etc., where concrete is exposed to
temperature variations In this research work, an attempt has been made to understand the
behaviour of concrete when weathered laterite aggregate is used in both
conventional and self compacting normal strength concrete. The study has been
extended to understand the thermal behaviour of both types of laterised concretes
and to check suitability as a fire protection material. A systematic study of laterised concrete considering parameters like source of laterite aggregate, grades of Ordinary Portland Cement (OPC) and types of supplementary cementitious materials (fly ash and GGBFS) has been carried out to
arrive at a feasible combination of various ingredients in laterised concrete. A mix design methodology has been proposed for making normal strength laterised self compacting concrete based on trial mixes and the same has also been validated. The physical and mechanical properties of laterised concretes have been studied with respect to different variables like exposure temperature (200°C, 400°C and 600°C) and cooling environment (air cooled and water cooled). The behaviour of ferrocement elements with laterised self compacting concrete has also been studied by varying the cover to mesh reinforcement (10mm to 50mm at an interval of 10mm), exposure temperature and cooling environment. |