Abstract:

Geopolymer concrete has been regarded as one of the most important green construction materials, which has been restrained in engineering applications partially due to a lack of bond studies. Reinforced concrete components' structural performance depends on the concrete-reinforcing bar bond. GPC must show understandable bond behaviour with commercial steel reinforcements before being used in concrete structures. The bond stress of steel bars in reinforced geopolymer concrete (GPC) structures was experimentally investigated. Standard beam-end pull-out tests were performed on GPC specimens reinforced with 16 mm plain and ribbed bars and electrical resistance strain gauges. The longitudinal variation in GPC beam bond stress during pull-out tests and steel bar stress were calculated and plotted. GPC bond area cracks, steel stress, and bond stress were compared to OPC. The relative slip between plain bar and geopolymer concrete ranged from 30–450 microns from loaded to free when bond stress dropped 83%. When bond stress drops 57%, ribbed bar and geopolymer concrete slip 280–3,000 microns from loaded to free. GPC has different bond stress distribution than OPC.