RECYCLING OF CONCRETE RUBBLE IN CONCRETE PRODUCTION
Shuaibu, k
Department of Civil Engineering
Kaduna Polytechnic, Kaduna, Nigeria
ABSTRACT
The research work was carried out on both control and recycled concrete samples and three groups of specimen (concrete cubes) were prepared and the workability of each specimen measured using specific standard consistency test, setting time of cement, soundness of cement, compacting factor test, compressive strength of concrete, sieve analysis for the aggregate. Cubes were casted, cured in water and the compressive strength determined at 0%, 10%, and 20% .The concrete were casted and cured for 7, 14, 21 and 28 days and their mean compressive strength for 10% are 13.78 N/mm2, 16.67 N/mm2, 18.67N/mm2 and 21.78 N/mm2, while that of 20% are: 13.56 N/mm2, 15.78 N/mm2 17.56 N/mm2,,20.89 N/mm2 13.78N/mm2,all from the rubbles.. The following are for the control. They are: 16.23 N/mm2, 20.22 N/mm2, 22.45 N/mm2 and 26.89 N/mm2.Though, the control has a better compressive strength as expected, it is however clear that even the concrete from recycled rubble have compressive strength that are within the British Standard (BS1881), which stipulate a minimum of 20 N/mm2 compressive strength for concrete after curing for 28 days.