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Flexural strength and failure of geopolymer concrete beams reinforced with carbon fibre-reinforced polymer bars
Highlights Geopolymer concrete beams with low rebar ratio recorded significant deformation. Concrete compressive strength had a significant effect on the first crack of GPC beams. The CFRP-RGPC beams had more deflection than CFRP-ROPC beams. Number of cracks in the CFRP-RGPC beams was higher than that in the CFRP-ROPC. CFRP-ROPC beams obtained a higher value of crack width compared with CFRP-RGPC.
Abstract Geopolymer concrete with carbon fibre-reinforced polymer bars can provide a good construction system with high sustainability, high durability and appropriate strength. Few studies have used a combination of these materials, especially the carbon fibre-reinforced polymer bar. The present investigation obtains the flexural strength and behaviour of geopolymer concrete and ordinary Portland concrete beams reinforced with carbon fibre-reinforced polymer bars. Twelve beams consisting of nine geopolymer concrete and three ordinary Portland concrete beams were cast and investigated by using the four-point bending test over an effective span of 2000 mm. Reinforcement ratio, compressive strength and concrete types were taken as the variables. First cracking load, ultimate load, load-deflection behaviour, load-strain curve, crack width, number of cracks and modes of failure, were studied. Experimental results were compared with the proposed equations provided by ACI 440.1R-15, CSA S806-12 and the proposed method. Results showed the decrease of deflection and increase of first cracking load with the increase of compressive strength, a slight increase in the deflection of geopolymer concrete beams and nearly the same value of ultimate load were observed; geopolymer concrete beams also recorded a lower value of crack width compared with ordinary Portland concrete beams. ACI 440.1R-15 and CSA S806-12 underestimated the flexural strength of the beams, while the proposed method which based on the parabolic stress block predicted more accurately.
Flexural strength and failure of geopolymer concrete beams reinforced with carbon fibre-reinforced polymer bars
Highlights Geopolymer concrete beams with low rebar ratio recorded significant deformation. Concrete compressive strength had a significant effect on the first crack of GPC beams. The CFRP-RGPC beams had more deflection than CFRP-ROPC beams. Number of cracks in the CFRP-RGPC beams was higher than that in the CFRP-ROPC. CFRP-ROPC beams obtained a higher value of crack width compared with CFRP-RGPC.
Abstract Geopolymer concrete with carbon fibre-reinforced polymer bars can provide a good construction system with high sustainability, high durability and appropriate strength. Few studies have used a combination of these materials, especially the carbon fibre-reinforced polymer bar. The present investigation obtains the flexural strength and behaviour of geopolymer concrete and ordinary Portland concrete beams reinforced with carbon fibre-reinforced polymer bars. Twelve beams consisting of nine geopolymer concrete and three ordinary Portland concrete beams were cast and investigated by using the four-point bending test over an effective span of 2000 mm. Reinforcement ratio, compressive strength and concrete types were taken as the variables. First cracking load, ultimate load, load-deflection behaviour, load-strain curve, crack width, number of cracks and modes of failure, were studied. Experimental results were compared with the proposed equations provided by ACI 440.1R-15, CSA S806-12 and the proposed method. Results showed the decrease of deflection and increase of first cracking load with the increase of compressive strength, a slight increase in the deflection of geopolymer concrete beams and nearly the same value of ultimate load were observed; geopolymer concrete beams also recorded a lower value of crack width compared with ordinary Portland concrete beams. ACI 440.1R-15 and CSA S806-12 underestimated the flexural strength of the beams, while the proposed method which based on the parabolic stress block predicted more accurately.
Flexural strength and failure of geopolymer concrete beams reinforced with carbon fibre-reinforced polymer bars
Ahmed, Hemn Qader (author) / Jaf, Dilshad Kakasor (author) / Yaseen, Sinan Abdulkhaleq (author)
2019-10-06
Article (Journal)
Electronic Resource
English
OPC , Ordinary Portland Concrete , GPC , Geopolymer Concrete , FRP , Fibre-Reinforced Polymer , CFRP , Carbon Fibre-Reinforced Polymer , SROPC , Steel-Reinforced Ordinary Portland Concrete , SRGPC , Steel-Reinforced Geopolymer Concrete , CFRP-RGPC , Carbon Fibre-Reinforced Polymer-Reinforced Geopolymer Concrete , CFRP-ROPC , Carbon Fibre-Reinforced Polymer-Reinforced Ordinary Portland Concrete , Flexural strength , Geopolymer concrete , Carbon fibre-reinforced polymer bar , Sustainability
| Springer Verlag | 2020