I. Report No. FHWA/TX-97/1244-11 I 2. Government Accession No. 4. Title and Subtitle INFLUENCE OF COARSE AGGREGATE IN PORTLAND CEMENT CONCRETE ON SP ALLING OF CONCRETE PAVEMENTS 7. Author( s) Sanjaya P. Senadheera and Dan G. Zollinger 9. Performing Organization Name and Address Texas Transportation Institute The Texas A&M University System College Station, Texas 77843-3135 12. Sponsoring Agency Name and Address Texas Department of Transportation Research and Technology Transfer Office P.O. Box 5080 Austin, Texas 78763-5080 15. Supplementary Notes Technical Report Documentation Page 3. Recipient's Catalog No. 5. Report Date November 1995 Revised: October 1996 6. Performing Organization Code 8. Performing Organization Report No. Research Report 1244-11 10. Work Unit No. (fRAIS) 11. Contract or Grant No. Study No. 0-1244 13. Type of Report and Period Covered Interim: September 1992-August 1995 14. Sponsoring Agency Code Research performed in cooperation with the Texas Department of Transportation and the U.S. Department of Transportation, Federal Highway Administration. Research Study Title: Evaluation of the Performance of Texas Pavement Made with Different Coarse Aggregates 16. Abstract Spalling is a form of distress in concrete pavements. However, the current state of knowledge and the available prediction models on spalling indicate a lack of understanding of the spalling mechanism. This research attempts to fill the need to develop a framework to incorporate spalling in the design of concrete pavements based on a mechanistic approach. The report presents results from a comprehensive field survey on spalling in concrete pavements in Texas. Based on the results from this field survey, a mechanism for spalling is proposed. According to this mechanism, spalling is the culmination of damage initiated as· delaminations early in the life of pavements. The development of delaminations is related to the concrete mix design and conditions at the time of paving including ambient conditions and the method of curing. The delaminations are extended into spalls as a result of fatigue damage induced by traffic and temperature fluctuations in the pavement. Early-age analysis of concrete pavements was performed using a finite element program developed to predict stresses in the pavement caused by shrinkage. Results from the analysis indicated that a high level of stress sufficient to create delaminations may be generated at a very early age. The coarse aggregate type in concrete was noted to have a significant effect on the level of spalling. Based on results from laboratory studies, a mechanism on how the aggregate type influences spalling is proposed. This proposed spalling mechanism is included in a framework to incorporate spalling in the design of concrete pavements. 17. Key Words 18. Distribution Statement Spalling, Cracking, Coarse Aggregate, Curing, Properties of Aggregates, Evaluation of Aggregates No restrictions. This document is available to the public through NTIS: 19. Security Classif.(of this report) Unclassified Form DOT F 1700.7 (8-72) National Technical Information Service 5285 Port Royal Road Springfield, Virginia 22161 1 20. Security Classif.( of this page) Unclassified Reproduction of completed page authorized 1 21. No. of Pages 222 I 22. Price
INFLUENCE OF COARSE AGGREGATE IN PORTLAND CEMENT CONCRETE ON SP ALLING OF CONCRETE PAVEMENTS
May 21, 2023
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