Microstructural analysis of recycled aggregate concrete subjected to sustained elevated temperature
By: Vadiraj Rao, N. R
.
Contributor(s): Naveen, B. O.
Publisher: Thane ACC LTD 2023Edition: Vol.97(12), Dec.Description: 48-56p.Subject(s): ARCHITECTURE GENERAL (AR-GEN)Online resources: Click here
In:
Indian Concrete Journal - ICJSummary: In recent years, most of the countries are promoting regulations on waste minimisation, recycling and reuse, due to its environmental impact and imminent exhaustion of available landfill capacity for the safe disposal of wastes. Hence, reuse and recycling of demolished concrete has drawn larger attention in the area of research. Currently, the demolition sites produce an oversized quantity of wastes, so that there is a greater scope to recycle the demolition waste and to use as a construction material for structural concrete. In the present study, an experimental investigation has been performed to assess the mechanical properties and to study the microstructural changes of recycled aggregate concrete (RAC) exposed to elevated temperatures of 200o C and 400o C. Further, RAC along with hybrid fibres (Steel + Polypropylene) for different mixes were also studied. To evaluate the performance of RAC at ambient and elevated temperatures, 72 cubes and cylinders and 30 beams were tested to study the mechanical properties at sustained elevated temperature for 2 hours of duration. Further, microstructural analysis of the samples was carried out by two methods i.e., by energy dispersive X-ray spectroscopy (EDX) and scanning electron microscope (SEM). From the results, it can be inferred that, among different percentage replacements of recycled aggregates, the mix having 50 % RAC shows better performance in compressive strength as well as improved microstructure at ambient and elevated temperatures and RAC with low water-cement ratio had a better fire resistance than natural aggregate concrete.
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In recent years, most of the countries are promoting regulations on waste minimisation, recycling and reuse, due to its environmental impact and imminent exhaustion of available landfill capacity for the safe disposal of wastes. Hence, reuse and recycling of demolished concrete has drawn larger attention in the area of research. Currently, the demolition sites produce an oversized quantity of wastes, so that there is a greater scope to recycle the demolition waste and to use as a construction material for structural concrete. In the present study, an experimental investigation has been performed to assess the mechanical properties and to study the microstructural changes of recycled aggregate concrete (RAC) exposed to elevated temperatures of 200o C and 400o C. Further, RAC along with hybrid fibres (Steel + Polypropylene) for different mixes were also studied. To evaluate the performance of RAC at ambient and elevated temperatures, 72 cubes and cylinders and 30 beams were tested to study the mechanical properties at sustained elevated temperature for 2 hours of duration. Further, microstructural analysis of the samples was carried out by two methods i.e., by energy dispersive X-ray spectroscopy (EDX) and scanning electron microscope (SEM). From the results, it can be inferred that, among different percentage replacements of recycled aggregates, the mix having 50 % RAC shows better performance in compressive strength as well as improved microstructure at ambient and elevated temperatures and RAC with low water-cement ratio had a better fire resistance than natural aggregate concrete.
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