TECHNICAL REPORT STANDARD TITLE PAGE 1. R.,port No. 2. Government Aceeuion No. J. Recipient' a Catalog No. FHWA/TX-79/09+207-5 4. Title and Subtitle ______ __._ _____________ 1-s;-.-:R;:;-.,-o-rt-:0:-o-te __ _ ----1 ., METHeBOtOGY FOR PRtDICFING THE REFLECTION CRACKING LIFE OF ASPHALT CONCRETE OVERLAYS 7. Author 1 s) Frederick P. Germann, and Robert L. Lytton 9. P.,rlorming Orgoni zation Nome ond Addreu Texas Transportation Institute Texas A&M University College Station, Texas 77843 March, 1979 6. Performing Organtrotton Code 8. ?erformtng Orgoniaotion Report No. Research Report 207-5 10. Work Unit No. 11. Contract or Grant No. Study 2-8-75-207 13. Type of Report and Period Covered I 12. Sponsoring Agency Nome ond Addreu ---------------oj I teri _ September, 1974 Texas State Department of Highways and Public n m March, 1979 i Transportation Transportation Planning Division 14 · Sponaoring Agency Code P. 0. Box 5051; __ 15. Supplementary Note• I I Work done in cooperation with FHWA, DOT. Study Title: Flexible Pavement Evaluation and Rehabilitation 16. Abstroet I An experimental testing procedure has been established in the report, for I quantitative analysis of overlays designed to reduce reflection cracking. From this testing procedure the overlay scheme that shows the most resistance to cracking can be chosen. The procedure uses crack propagation tests on overlay samples which are conducted on a machine called the 11 0verlay tester ... This machine was specifically built to stimulate the displacements resulting from changes in the jointed pavement or base materials that are beneath an overlay. Various types of samples were investigated on the overlay tester. These include samples with fabric, such as .. and samples composed of different grades of asphalt, AC-5, AC-10, and AC-20; various gradations, open graded, dense graded, and hot sand mixes; and different overlay thickness of one, two, and three inches. I In order to design an overlay, determining its proper thickness and re- 1 inforcing as well as the quantities of the constituents used in the mix, its I reflection cracking life must be predicted so that the proposed overlay's res1st"ance to cracking can be easily seen. One way to determine the fatigue life I is to tes_ts on overlay samples using the overlay tester. These tests can be .tirnELconsum1ng and costly. Another method to find the fatigue 1 ife is .. to u. se a .m.ethod of ana.lys·i·s that.- c.o .. ns iders-lhe concentration Qf stresse near the __ crack 'tjP."' known as 11 fracture mechanics. 11 To use fracture mechanics, two material constants have to-be material (continued on back) 17. Key Words 18. Distribution Stetement Reflection cracking, thermal cycling, asphalt concrete overlays. No Restrictions. This document is ayailable to the public throagh the 1 National Technical Information Service, Springfield, Virginia 22161 I I Unclassified Unclassified i 147 Form DOT F 1700.7 18·691
METHeBOtOGY FOR PRtDICFING THE REFLECTION CRACKING LIFE OF ASPHALT CONCRETE OVERLAYS
May 06, 2023
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