
Concept explainers
A suitable thickness of the concrete pavement if the working stress of the concrete is

Answer to Problem 20P
The suitable depth of concrete pavement is
Explanation of Solution
Given:
Design life is
Annual rate of traffic growth is
Sub grade
Stabilized sub-base is of
Modulus of rupture of the concrete is
Traffic volume data on the highway indicate that the AADT during the first year of operation is
The pavement has aggregate interlock joints (no dowels) and a concrete shoulder.
Formula used:
The design equivalent single axle load is given by,
Here,
The total ESAL is given by,
Here,
The stress ratio is given by,
Here,
The damage percent is given by,
Here,
Calculation:
The design equivalent single axle load for
Substitute
The design equivalent single axle load for
Substitute
The design headwater depth is calculated as,
Substitute
The sub grade value of
From table 20.22, "Deign
Assume a slab
From table 20.24, "Equivalent stress values for single axles and tandem axles" of book "Traffic and highway engineering" equivalent stress values can be obtained and for
The stress ratio is calculated as,
Substitute
From table 20.27, "Erosion factors for single axles and tandem axles (doweled joint, concrete shoulder" of book "Traffic and highway engineering" for
From figure 20.26, "Allowable Load Repetitions for Fatigue Analysis Based on Stress Ratio" of book "Traffic and highway engineering" for
Thus, the Fatigue analysis for
From figure 20.27, "Allowable Load Repetitions for Erosion Analysis Based on erosion factors" of book "Traffic and highway engineering" for
From figure 20.26, "Allowable Load Repetitions for Fatigue Analysis Based on Stress Ratio" of book "Traffic and highway engineering" for
From figure 20.27, "Allowable Load Repetitions for Erosion Analysis Based on erosion factors" of book "Traffic and highway engineering" for
The table showing the allowable repetitions for
Load | Fatigue analysis | Erosion analysis |
| Unlimited | Unlimited |
| | |
Table (1)
So the
Assume a slab
Calculate the equivalent stress.
From table 20.24, "Equivalent stress values for single axles and tandem axles" of book "Traffic and highway engineering" equivalent stress values can be obtained and for
The stress ratio is calculated as,
Substitute
From table 20.27, "Erosion factors for single axles and tandem axles (doweled joint, concrete shoulder" of book "Traffic and highway engineering" for
From figure 20.26, "Allowable Load Repetitions for Fatigue Analysis Based on Stress Ratio" of book "Traffic and highway engineering" for
Thus, the Fatigue analysis for
From figure 20.27, "Allowable Load Repetitions for Erosion Analysis Based on erosion factors" of book "Traffic and highway engineering" for
From figure 20.26, "Allowable Load Repetitions for Fatigue Analysis Based on Stress Ratio" of book "Traffic and highway engineering" for
From figure 20.27, "Allowable Load Repetitions for Erosion Analysis Based on erosion factors" of book "Traffic and highway engineering" for
The table showing the allowable repetitions for
Load | Fatigue analysis | Erosion analysis |
| Unlimited | Unlimited |
| unlimited | |
Therefore, the
Conclusion:
Therefore, the suitable depth of concrete pavement is
Want to see more full solutions like this?
Chapter 20 Solutions
Traffic and Highway Engineering
- 6. A lake with no outlet is fed by a river with a constant flow of 1200 ft3/s. Water evaporates from the surface at a constant rate of 13 ft3/s per square mile of surface area. The surface area varies with the depth h (in feet) as A (square miles) = 4.5 + 5.5h. What is the equilibrium depth of the lake? Below what river discharge (volume flow rate) will the lake dry up?arrow_forwardProblem 5 (A, B, C and D are fixed). Find the reactions at A and D 8 k B 15 ft A -20 ft C 10 ft Darrow_forwardProblem 4 (A, B, E, D and F are all pin connected and C is fixed) Find the reactions at A, D and F 8 m B 6m E 12 kN D F 4 marrow_forward
- Problem 1 (A, C and D are pins) Find the reactions and A, C and D. D 6 m B 12 kN/m 8 m A C 6 marrow_forwardUniform Grade of Pipe Station of Point A is 9+50.00. Elevation Point A = 250.75.Station of Point B is 13+75.00. Elevation Point B = 244.10 1) Calculate flowline of pipe elevations at every 50 ft. interval (Half Station). 2) Tabulate station and elevation for each station like shown on example 3) Draw Sketcharrow_forward40m 150N B 40marrow_forward
- Note: Please accurately answer it!. I'll give it a thumbs up or down based on the answer quality and precision. Question: What is the group name of Sample B in problem 3 from the image?. By also using the ASTM flow chart!. This unit is soil mechanics btwarrow_forwardPick the rural location of a project site in Victoria, and its catchment area-not bigger than 25 sqkm, and given the below information, determine the rainfall intensity for ARI = 5, 50, 100 year storm event. Show all the details of the procedure. Each student must propose different length of streams and elevations. Use fig below as a sample only. Pt. E-ht. 95.0 200m 600m PLD-M. 91.0 300m Pt. C-93.0 300m PL.B-ht. 92.0 PL.F-ht. 96.0 500m Pt. A-M. 91.00 To be deemed satisfactory the solution must include: Q.F1.1.Choice of catchment location Q.F1.2. A sketch displaying length of stream and elevation Q.F1.3. Catchment's IFD obtained from the Buro of Metheorology for specified ARI Q.F1.4.Calculation of the time of concentration-this must include a detailed determination of the equivalent slope. Q.F1.5.Use must be made of the Bransby-Williams method for the determination of the equivalent slope. Q.F1.6.The graphical display of the estimation of intensities for ARI 5,50, 100 must be shown.arrow_forwardQUANTITY SURVEYINGarrow_forward
- Traffic and Highway EngineeringCivil EngineeringISBN:9781305156241Author:Garber, Nicholas J.Publisher:Cengage LearningConstruction Materials, Methods and Techniques (M...Civil EngineeringISBN:9781305086272Author:William P. Spence, Eva KultermannPublisher:Cengage LearningFundamentals Of Construction EstimatingCivil EngineeringISBN:9781337399395Author:Pratt, David J.Publisher:Cengage,


