EXPERIMENTAL STUDIES ON PARTIALLY SET RECYCLED AGGREGATE CONCRETE USING SELFING CONCEPT

Construction industry is a backbone to the development of humankind with the time and has a major role to play further in up gradation of the existing infrastructure facilities worldwide. Whereas concrete is the most versatile and vitally used material, which consumes natural resources and has maximum environmental impact. Hence, consideration of sustainable development with the environmental preservation is prime focused research domain in recent time. Present studies focus on the use of recycled aggregate obtained from the construction waste as a structural material in concrete. An attempt has been made to investigate; all the physical and mechanical properties of recycled aggregate obtained from various sources and compare those properties with natural aggregates with respect to Indian Standard specifications for utilization in construction projects. Also due to many unforeseen circumstances at the site it may happen that a delay arises from the preparation of the mix to its placing in the formwork; where the concrete mass suffers setting and show a great loss in strength as well as workability, as a result it is declared as unserviceable and considered as waste. Thus the problem arises, whether the partially set mix should always be discarded from structural use. Hence the applicability of selfing concept to Recycled Aggregate Concrete (RAC) has been considered in present study along with investigation of the fresh and hardened properties of concrete by replacing natural aggregate with recycled aggregates, in different proportions like 10%, 20 % and 30% for M20 and M25 grade of concrete.