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Experimental study on flexural behavior of granite slab with carbon fiber reinforcement and deformed steel near surface

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Document pages: 30 pages

Abstract: An experimental study was carried out on the stone slab strengthened by near surface installation (NSM) technology of deformed steel bar and carbon fiber reinforced polymer (CFRP) reinforcement. A total of 10 full-size slabs were tested under four point bending load to study the effects of groove size, reinforcement ratio and reinforcement materials on the bending properties of slabs. The test results include failure characteristics, yield and ultimate bearing capacity, mid span deflection and cracking behavior. The test results show that the crack load and deflection decrease by 6.4 ~ 14.18 with the increase of groove height and width; However, the failure load and deflection increased by 4.7 - 41.2 . crackleng load, failure load, and failure displacement of stone slabs adopting NSM screw-thread steels increased by 10.9 , 167 , and 617 , respectively, under the maximum reinforcement ratios of 0.629 over the control slab without NSM bars. Meanwhile, with the increase of reinforcement ratios, the failure mode transforms from brittle failure to ductile failure. The calculation results of strength are in agreement with the experimental results. Finally, it can be concluded that NSM CFRP bars are more effective than NSM screw-thread steels to improve flexural capacity with the same reinforcement ratios.

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