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. The structural performance of the reinforced concrete components primarily relies on the sufficient bond between the concrete and the reinforcing bars. Before being utilized in any concrete structure, GPC must demonstrate that it possesses understandable bond behaviour with commercial steel reinforcements. This work presents an experimental investigation on the bond stress of steel bars in reinforced geopolymer concrete (GPC) structures. Standard beam-end pull-out tests were conducted on GPC specimens reinforced with 16 mm plain and ribbed bars that were equipped with electrical resistance strain gauges. The longitudinal variation in the bond stress in the GPC beams during the pull-out tests was calculated and plotted, as well as the stress in steel bars. The cracks on the bond area of the GPC were compared with those of the corresponding ordinary Portland cement concrete (OPC), as well as the steel stress and bond stress. The results showed that the relative slip between plain bar and geopolymer concrete varies from 30–450 microns from the loaded end to the free end when the bond stress decreased by 83%. The relative slip between ribbed bar and geopolymer concrete varies from 280–3,000 microns from the loaded end to the free end when the bond stress decreased by 57%. Generally, GPC is different from OPC in terms of bond stress distribution.
Highlights
Ordinary Portland cement is the most widely used construction material all over the world
E steel stress and bond stress were analysed, and the bond stress distribution along the embedment length was derived from the readings of the strain gauges
E cracks caused by splitting failure that appeared on the top and front faces of geopolymer concrete (GPC) and ordinary Portland cement concrete (OPC) were different. e cracks on the GPC samples were clean and straight, while those on the OPC samples consisted of several subbranches
Summary
Ordinary Portland cement is the most widely used construction material all over the world. It has been shown previously that, in many cases, geopolymer concrete (GPC) outperforms ordinary Portland cement concrete (OPC) with respect to the compressive strength [7], deformation resistance, and bond with the reinforcing bars [8]. Is paper addresses the bond performance between geopolymer concrete and steel bars in terms of the specifications for the bond stress distributions of GPC. As a contribution to the investigation of the engineering potential of GPC, this study uses strain gauges to investigate the bond stress distribution between GPC and steel bars in pull-out tests. 2. Experimental Programmes e experimental work aims to investigate the bond stress distribution between GPC and steel bars during pull-out tests and compares the results between the GPC specimens and identical OPC specimens. Experimental Programmes e experimental work aims to investigate the bond stress distribution between GPC and steel bars during pull-out tests and compares the results between the GPC specimens and identical OPC specimens. e specific lab work involves producing a class F fly ash-based GPC mix and a corresponding OPC mix with similar compressive strengths for ASTM A944 [21] bond testing
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