In Situ Flexible Pavement Material Characterization and Estimation of Distresses Under Dual and Wide Base Single Tires
Author | : Tayyeb Akram |
Publisher | : |
Total Pages | : |
Release | : 1992 |
Genre | : Pavements, Asphalt concrete |
ISBN | : |
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Author | : Tayyeb Akram |
Publisher | : |
Total Pages | : |
Release | : 1992 |
Genre | : Pavements, Asphalt concrete |
ISBN | : |
Author | : PE. Sebaaly |
Publisher | : |
Total Pages | : 15 |
Release | : 1992 |
Genre | : Axle configuration |
ISBN | : |
Dual radial tires and wide base radial single tires were tested in the laboratory under three levels of inflation pressures and axial loads. The measured characteristics of the tires were gross contact area, net area, tire deflection, and contact pressures. The distributions of contact pressures were used in a theoretical analysis to evaluate the flexible pavement performance related parameter. The response of two flexible pavement structures was investigated in terms of the tensile strains at the bottom of the asphalt layer. In the second phase of this research, two full scale pavement sections were instrumented using strain gages to measure the strains at the bottom of the asphalt concrete layer. The data analysis presented in this paper shows the effect of varying the tire type, tire inflation pressure, and axle load and configuration on the response of flexible pavements. The results of the two studies showed that the wide base single tires are more damaging than the dual tires under all combinations of the test variables.
Author | : Tayyeb Akram |
Publisher | : |
Total Pages | : 56 |
Release | : 1992 |
Genre | : Pavements, Asphalt concrete |
ISBN | : |
In this study multidepth deflectometers (MDD) were installed in two in-service asphaltic concrete highways (one thick, one thin) to measure the pavement response to vehicle loading. A specifically configured 352 truck was used in the study. It is normally an 18-wheel water tanker but was converted to a 14-wheel tanker for this study. For these tests, dual tires were used on the tandem drive axle with wide base single tires on the tandem trailer axle. Test runs were made under high inflation pressure conditions for the two tire types and the truck speed varying between 5 and 55 mph.
Author | : Alexander Afuberoh |
Publisher | : |
Total Pages | : 0 |
Release | : 2018 |
Genre | : |
ISBN | : |
The Mechanistic Empirical Pavement Design Guide (MEPDG) method, currently known as Pavement ME, recommends using locally calibrated material characterization models developed from laboratory testing of local materials under specific environmental and traffic loading conditions. The Pavement ME design method offers a more realistic design procedure and reduces the uncertainty that arise from empirical design procedures. This thesis developed a locally calibrated indirect tensile (IDT) strength material model for low temperature cracking predictions of hot mix asphalt (HMA) in Manitoba, Canada. In addition, the research investigated the integration of locally calibrated HMA, and unbound granular material characterization models into the Pavement ME framework to improve the design of flexible pavements. Laboratory IDT testing was conducted on typical HMA mixtures containing extracted binders and varying percentages of reclaimed asphalt pavement (RAP). The laboratory measured IDT strengths were used to calibrate a local IDT strength predictive model for Manitoba. The predictions from the local Manitoba model were compared to the predictions from the global Pavement ME IDT model, and a Michigan calibrated IDT model, using a statistical analysis. It was found that the global Pavement ME IDT strength model, if used without local calibration, produced inaccurate predictions of the IDT strength for Manitoba mixtures. It was also found that binder characterization methods in Level 2 and Level 3 can significantly impact the accuracy of IDT strength predictions. A case study using developed local HMA, base, and subgrade material characterization models in Manitoba were compared to designs using default (Level 3) material input values in Pavement ME design software. The results of integrating the locally calibrated models for HMA, base and subgrade layers demonstrated that the locally calibrated materials model inputs produce lower pavement structural thicknesses with higher reliability in the predicted distresses when compared to the default materials inputs. The effect of using calibrated material inputs was more pronounced for higher traffic loadings. The results of the study demonstrate that the use of calibrated models can potentially produce optimized pavement thicknesses due to improved pavement designs.
Author | : Marion G. Pottinger |
Publisher | : ASTM International |
Total Pages | : 321 |
Release | : 1986 |
Genre | : Automobiles |
ISBN | : 0803104979 |
Author | : John Jewett Henry |
Publisher | : ASTM International |
Total Pages | : 189 |
Release | : 1992 |
Genre | : Pavements |
ISBN | : 0803114834 |
Author | : G. J. Chong |
Publisher | : [Downsview] : Research and Development Branch, Ministry of Transportation of Ontario |
Total Pages | : 120 |
Release | : 1989 |
Genre | : Highway engineering |
ISBN | : |
This manual categorizes distress manifestations and provides illustrations of each category to lend uniformity to reporting and interpretation. Descriptions of the density of occurrence and the severity of each type of distress manifestation are made to conform to standard words which precisely express the relative density or severity on a scale of 1-5. Probable causes of each distress manifestation are presented, together with comments on progressive deterioration or other behaviour which might affect remedial treatment. Possible remedial measures are included under each distress manifestation.