INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
EVALUATION OF BOND STRENGTH AND DURABILITY PERFORMANCE OF FRP REINFORCING BARS FOR CONCRETE STRUCTURES
Autor/es:
J.P MORALES ARIAS; MARIANO ESCOBAR; ANALÍA VAZQUEZ
Lugar:
Oporto
Reunión:
Conferencia; 16th International Conference on composites Structures, ICCS‐16.; 2011
Institución organizadora:
Facultad de Ingeniería - Universidad de Oporto
Resumen:
One of the main advantages of glass fiber reinforced polymer bars (GRP) compared with the steel bars, which are normally used in reinforced concrete, is their better resistance to corrosion. In this paper fibre reinforced polymer bars (FRP) based on glass fiber and unsaturated polyester resin, type orthophtalic, with a nominal diameter 9 and 16 mm were used.We studied the improvement of the adhesion between the bars (FRP) and concrete. The bars (FRP) were ribbed with different arrangements of ribs; plain bars were also tested without ribs and sanded with coarse sand bars. Different concrete were also tested: H-20 and H-60. Pullout tests were conducted to measure the adhesion between the bars and concrete these were made as recommended by ACI 440 3R. It was observed that the addition of sand help ribbed bars that have a better adhesion to concrete.In spite that these bars are used for corrosion resistance, it is necessary to evaluate their durability on alkaline medium Durability tests were conducted on fiberglass rods to see the behavior of the absorption of water bars and in a saturated Ca(OH)2 with a pH of 12:50. It was noted that the absorption of the bars in both environments are the same until 768 hours at 25°C but from this time FRP rods immersed on Ca(OH)2 begins to decrease in absorption compared with water medium. Analysis of interphase was done by Scanning Electronic Microscopy (SEM). The content of calcium hydroxide inter-fiber was analyzed by gravimetric thermal analysis (TGA). The decrease of the glass transition value was determined by scanning thermal calorimetry (DSC).