Technical Report Documentation Page 1. Report No. TX-99/4925-1 2. Government Accession No. 3. Recipient's Catalog No. 4. Title and Subtitle ANALYSIS OF FIELD MONITORING DATA OF CRC PAVEMENTS CONSTRUCTED WITH GRADE 70 STEEL 5. Report Date March 1999 6. Performing Organization Code 7. Author(s) Dan G. Zollinger, Andrew McKneely, Joshua Murphy, and Tianxi Tang 8. Performing Organization Report No. Report 4925-1 9. Performing Organization Name and Address Texas Transportation Institute Texas A&M University System College Station, Texas 77843-3135 10. Work Unit No. (TRAIS) 11. Contract or Grant No. Project No. 7-4925 12. Sponsoring Agency Name and Address Texas Department of Transportation Research and Technology Transfer Office P. O. Box 5080 Austin, Texas 78763-5080 13. Type of Report and Period Covered Research: January 1998 - August 1998 14. Sponsoring Agency Code 15. Supplementary Notes Research performed in cooperation with the Texas Department of Transportation. Research Project Title: Evaluation of Grade 70 Steel 16. Abstract This report addresses important factors associated with the design of steel reinforcement in terms of layer configuration, bond characteristic, climatic affect, and others relative to an assessment of the suitability of the CRCP 8 program to represent and predict steel stresses in CRC pavement systems. It was necessary to instrument an actual section of CRC pavement for concrete and steel strains as they fluctuated under climatic and seasonal changes. The steel rebars were instrumented in a manner that would limit disturbance of the bond between the steel and the concrete, yet allow for precise measurements of the steel strain at various distances from the crack face. Other field sections containing Grade 70 steel were also included in this study. Crack spacing and crack width data were collected and reported. In light of this emphasis, the researchers recognized that a key aspect of the steel design considerations is how important parameters—such as the steel surface area, degree of bond, the grade of steel, and the amount of steel—relate to the maximum opening transverse cracks in the pavement may attain over the design life of the pavement. Inherent in configuring the reinforcement in CRC pavement to perform at a adequate level below its yield limit is the maintenance of the transverse crack widths below specified levels to insure adequate stiffness at the transverse cracks. Crack width data varied as a function of the distance from the pavement surface, and it was noted in the report that the vertical position of the steel within the slab affects this variation and consequently should be a consideration in determining the vertical position of the reinforcing layer in construction. 17. Key Words Concrete, Performance, Reinforcing Steel, Mechanistic Design, Crack Spacing, Crack Width 18. Distribution Statement No restrictions. This document is available to the public through NTIS: National Technical Information Service 5285 Port Royal Road Springfield, Virginia 22161 19. Security Classif.(of this report) Unclassified 20. Security Classif.(of this page) Unclassified 21. No. of Pages 311 22. Price Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
ANALYSIS OF FIELD MONITORING DATA OF CRC PAVEMENTS CONSTRUCTED WITH GRADE 70 STEEL
May 30, 2023
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