For the thickness design of a concrete pavement for a four-lane national highway, the following information is available. The current traffic volume (ADT) in both directions is 13500. Truck traffic volume is 40% of the total. For a design period of 15 years, the traffic projection factor is 2.6. The Percentage of trucks using the design lane is 80%. The Combined k for subgrade and subbase is 130 pci. The Modulus of rupture for concrete is 650 psi. The Load safety factor is 1. The Initial assumed thickness is 9.5 inches. Determine the no. of expected axle repetitions per 10,000 trucks in the design lane for the design period for the given axles.
For the thickness design of a concrete pavement for a four-lane national highway, the following information is available. The current traffic volume (ADT) in both directions is 13500. Truck traffic volume is 40% of the total. For a design period of 15 years, the traffic projection factor is 2.6. The Percentage of trucks using the design lane is 80%. The Combined k for subgrade and subbase is 130 pci. The Modulus of rupture for concrete is 650 psi. The Load safety factor is 1. The Initial assumed thickness is 9.5 inches. Determine the no. of expected axle repetitions per 10,000 trucks in the design lane for the design period for the given axles.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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100%
X=30
Transcribed Image Text:**Concrete Pavement Thickness Design for a Four-Lane National Highway**
**Overview:**
To effectively design the thickness of a concrete pavement for a four-lane national highway, the following parameters and calculations are crucial.
- **Current Traffic Volume:**
- Average Daily Traffic (ADT) in both directions: 13,500 vehicles.
- Truck traffic constitutes 40% of the total traffic.
- **Design Specifications:**
- Design period: 15 years.
- Traffic projection factor: 2.6.
- Percentage of trucks using the design lane: 80%.
- Combined k-value for subgrade and subbase: 130 pci.
- Concrete's modulus of rupture: 650 psi.
- Load safety factor: 1.
- Initial assumed pavement thickness: 9.5 inches.
**Objective:**
Determine the number of expected axle repetitions per 10,000 trucks in the design lane for the design period for the given axles.
**Fatigue Analysis Table:**
| Axle Type | Axle Load (kip) | Allowable Repetitions | Fatigue Percent |
|-----------------|-----------------|--------------------------|-----------------|
| **Single Axles** | | | |
| | 26 | 15000+(250*X) | 9.7 |
| | 24 | 20000+(300*X) | 8.1 |
| | 22 | 25000+(400*X) | 6.6 |
| | 20 | 35000+(450*X) | 4.8 |
| | 18 | 50000+(450*X) | 3.2 |
| | 16 | 63000+(450*X) | 1.2 |
| **Tandem Axles**| | | |
| | 52 | 65000+(250*X) | 8.7 |
| | 48 | 70000+(300*X) | 7.3 |
| | 44 | 80000+(300*X) | 6.2 |
| | 40 | 85000+(400*X) | 5.5
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