Degradation Assessment of Internal Continuous Fiber Reinforcement in Concrete Environment

The Fiber Reinforced Polymer properties include high strength-to-weight ratio, high stiffness-to-weight ratio, high-energy absorption, and outstanding corrosion and fatigue damage resistance. Therefore, the use of continuous basalt, glass, and carbon fiber reinforcement in concrete structural applications seems to be promising for reinforcing new concrete structures and strengthening applications. The main objective of this study was to evaluate the characteristics of glass fiber reinforced polymer (GFRP) bars, basalt fiber reinforced polymer (BFRP) reinforcing and prestressing bars, and carbon fiber composite prestressing cables. The test variables included the tensile strength, the modulus of elasticity, behavior, and durability under severe environmental exposures. The study investigated the physical and mechanical properties, durability, and bond strength to concrete of the FRP composites. In addition, the investigators tested concrete beams and slabs reinforced with basalt (BFRP) bars and investigated the bond-dependent coefficient. The tested GFRP bars have shown a value of tensile capacity retention over 80%, meeting the D1 requirement of CSA S807 for the alkali resistance in high pH solution with load. The study also confirmed that some types of basalt FRP (BFRP) bars meet the requirements of ACI 440 and CSA S807 concerning their physical and mechanical properties. Moreover, the researchers in this study investigated the long-term performance of these BFRP bars in different environments and under different exposure conditions and recorded some degradation. Some tested basalt FRP bar did not satisfy the CSA S807 and ACI 440 requirements. Scanning electronic microscopy (SEM) analysis of some BFRP has shown that porosity, large voids, and microcracks. The carbon fiber composite prestressing cables showed excellent performance, maintaining very high guaranteed tensile strength retention and elastic modulus retention after conditioning for over 7,000 hours in alkaline solution at 60°C. That indicates a great potential for implementing the use of the carbon prestressing cables in prestressed concrete applications.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 297p

Subject/Index Terms

Filing Info

  • Accession Number: 01535690
  • Record Type: Publication
  • Report/Paper Numbers: BDK82-977-05
  • Files: TRIS, ATRI, STATEDOT
  • Created Date: Aug 7 2014 1:31PM