Fiber Reinforced Lightweight Shotcrete for Patching and Retrofitting of Concrete Structures

Concrete structures may become unsatisfactory as the age of the structure increases. Corrosion of steel reinforcement, excessive deflections, and surface cracking are some causes of deterioration in concrete. One form of rehabilitation of the structure is the use of shotcrete. In the present study, a low-density structural shotcrete was developed. In order to decrease the density, cenospheres were used as the fine aggregate. Cenospheres are ceramic, hollow micro-balloons produced during coal burning processes, and have diameters ranging from 10-300 micrometers. The compressive, indirect tensile, and flexural strengths and fracture toughness of the cenosphere-modified shotcrete were determined in accordance with ASTM standards. Dynamic compression and indirect tension tests were performed by the use of a Split Hopkinson Pressure Bar. Water absorption, freezing and thawing, deicing salt resistance, and chloride permeability were tested in accordance with ASTM standards. Lastly, the cenosphere-modified shotcrete was applied to existing concrete in order to evaluate the capacity of shotcrete as an adequate method of rehabilitation.

• Corporate Authors:

  University of Rhode Island, Kingston

  College of Engineering
  Kingston, RI  United States  02881

  Rhode Island Department of Transportation

  State Office Building, 2 Capitol Hill
  Providence, RI  United States  02903
• Authors:
  • Shukla, Arun
  • Brown, Richard
  • Ruggiero, Paul
• Publication Date: 2007-5

Language

• English

Media Info

• Media Type: Print
• Edition: Final Report
• Features: Appendices; Bibliography; Figures; References; Tables;
• Pagination: 57p

Subject/Index Terms

• TRT Terms: Concrete structures; Fiber reinforced materials; Fine aggregates; Lightweight aggregates; Mechanical properties; Patching; Physical properties; Rehabilitation; Retrofitting; Shotcrete
• Uncontrolled Terms: Cenospheres
• Subject Areas: Highways; Maintenance and Preservation; I60: Maintenance;

Filing Info

• Accession Number: 01088831
• Record Type: Publication
• Report/Paper Numbers: RIDOT-RTD-03-3
• Contract Numbers: SPR-2(28)-2272
• Files: TRIS, STATEDOT
• Created Date: Feb 25 2008 2:36PM