A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Roadway Failure Study No. Ii. Lateral Cracking of Asphaltic Concrete
The purpose of this investigation has been to examine the relationship of asphalt aging to the alteration of mix properties and to the variation in frequency of lateral cracking of asphaltic concrete pavements. At three field test sites temperature records were made during the winter months. Based on the 2-inch pavement thickness, temperature differentials of 11 degrees per inch of pavement thickness were observed. Expansion and contraction measurements were made on reference points at artificial joints and in uncracked areas. A correspondence of crack width increase was noted with a decrease of pavement temperature. The artificial joints or weakness planes were created to observe their effect on pavement contraction and their effectiveness for controlling lateral cracking. Observations of pavements cut at 50-foot spacing indicated satisfactory performance during a one-year period. Subgrade friction tests were conducted by measuring the horizontal force necessary to cause movement of the pavement on the subgrade. An analysis was made of plane thermal stresses and thermal warping stresses, using mathematical expressions and a computer solution. It was found that the computed longitudinal warping stresses could exceed the observed ultimate tensile strengths although the actual pavements did not necessarily experience lateral cracking during early life. The report includes recommendations for improved design and construction and for further research. (Author) BPR Abstract.
Roadway Failure Study No. Ii. Lateral Cracking of Asphaltic Concrete
The purpose of this investigation has been to examine the relationship of asphalt aging to the alteration of mix properties and to the variation in frequency of lateral cracking of asphaltic concrete pavements. At three field test sites temperature records were made during the winter months. Based on the 2-inch pavement thickness, temperature differentials of 11 degrees per inch of pavement thickness were observed. Expansion and contraction measurements were made on reference points at artificial joints and in uncracked areas. A correspondence of crack width increase was noted with a decrease of pavement temperature. The artificial joints or weakness planes were created to observe their effect on pavement contraction and their effectiveness for controlling lateral cracking. Observations of pavements cut at 50-foot spacing indicated satisfactory performance during a one-year period. Subgrade friction tests were conducted by measuring the horizontal force necessary to cause movement of the pavement on the subgrade. An analysis was made of plane thermal stresses and thermal warping stresses, using mathematical expressions and a computer solution. It was found that the computed longitudinal warping stresses could exceed the observed ultimate tensile strengths although the actual pavements did not necessarily experience lateral cracking during early life. The report includes recommendations for improved design and construction and for further research. (Author) BPR Abstract.
Roadway Failure Study No. Ii. Lateral Cracking of Asphaltic Concrete
D. R. Lamb (author) / W. G. Scott (author) / R. H. Gietz (author) / J. D. Armijo (author)
1967
205 pages
Report
No indication
English
Civil Engineering , Ceramics, Refractories, & Glass , Miscellaneous Materials , Pavements , Asphalt , Concrete , Cracks , Failure(Mechanics) , Temperature , Aging(Materials) , Thermal stresses , Performance(Engineering) , Tensile properties , Friction , Penetration , Viscosity , Measurement , Thickness , Roads , Wyoming
Lateral Cracking of Asphaltic Concrete Pavement
| NTIS | 1965
Failure envelopes for asphaltic concrete
| Springer Verlag | 1973
Minimizing premature cracking in asphaltic concrete pavement
| TIBKAT | 1978
Failure envelopes for asphaltic concrete
| Springer Verlag | 1973