STRENGTHENING OF REINFORCED CONCRETE ONE - WAY SLABS USING CFRP IN FLEXURAL

[ Salman * , 4( 8 ): August , 2015 ] ISSN: 2277 - 9655 (I2OR), Publication Impact Factor: 3.785 http: // www.ijesrt.com © International Journal of Engineering Sciences & Research Technology [ 247 ] IJESRT INTERNATIONAL JOURNA L OF ENGINEERING SCI ENCES & RESEARCH TECHNOLOGY STRENGTHENING OF REINFORCED CONCRETE ONE - WAY SLABS USING CFRP IN FLEXURAL Dr. Wissam D. Salman * , Dr. Murtada A. Ismael, MSc. Qusay W. Ahmed Department of Civil Engineering, C ollege of Engineering , Diyala University, Iraq ABSTRACT The present study examines the potential of using carbon fiber reinforced polymer (CFRP) strip technique in repairing or strengthenin g of preloaded, cracked, reinforced concrete one - way solid slabs. The reinforced concrete (RC) slabs specimens were casted with dimensions of 1400×450×90 mm. Totally, seven specimens are tested, including one reference specimen without strengthening and si x specimens strengthening with CFRP strips. CFRP strips are placed along the slabs with different lengths and configurations. Before strengthening, The slabs were preloaded to level of 60% from the ultimate load capacity of the slabs. Length and configurat ion of CFRP strip are the main parameters that are investigated in this experimental research. The strengthening slabs are divided into two groups according to configuration of CFRP strip, each group consist of three slabs, in both groups, effect of length of CFRP strip using three lengths (600mm, 800mm and 1000mm) was studied, but in the first group one segment of CFRP strip with (100mm) width was used , while in the second two segments of CFRP strip with (50mm) width were used. The slabs were loaded und er two point static load up to failure and the structural response of each slab specimen was investigated in terms of the onset of cracking, deflection, ultimate load and failure mode. The efficiency of using CFRP strips technique to repair or strengthenin g and their effects on the structural behavior of cracked concrete slab had been analyzed. It was observed that the strengthening technique used in this study is affect the load carrying capacity, deflection, stiffness, concrete compressive strain, crackin g load and crack width of the slab. This repair or strengthening technique was found to be able to restore and enhance the structural capacity of cracked concrete slabs