This paper presents the experimental investigation on the influence of recycled aggregate from the demolished concrete on the physical and mechanical characteristics of geopolymer concrete and flexural behavior of reinforced geopolymer concrete beams. Based on the experimental results obtained and the discussions, the conclusions listed below can be drawn:
(1)
The reduction in the slump was greatly reduced with the inclusion of superplasticizer with increasing amount of RCA.
(2)
Mix with 50% RCA (GPC50RA) exhibited improved compressive strength and water absorption characteristics.
(3)
The improved and dense structure after 28 days results in less reduction in the strength with increase in RCA content.
(4)
Yet there is a slight decline in the initial stiffness and enhanced ultimate flexural deflections with the increase in RCA content, the effect of inclusion of RCA has a momentous consequence on the flexural strength of the AAS concrete beams.
(5)
The load carrying capacity of the GPC beams increase with the increase in the RCA content. The increase was observed to be optimum at 75% replacement level with an increase in the loading as 22.53% and reduces at 100% replacement.
(6)
The deflection and the ductility characteristics of the geopolymer beams improve with the increase in the RCA content. The span/deflection ratios of all the mixes were found to be within the permissible limits provided by ACI.
(7)
The failure of all the beams was observed to be due to the formation of flexural cracks and no spot of shear cracks were observed.