The age at which the PCR reaches the value of 81 for the performance of a two casesof pavement section before being overlaidand performance of overlay.

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Chapter 21, Problem 11P

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The age at which the PCR reaches the value of 81 for the performance of a two casesof pavement section before being overlaidand performance of overlay.

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Q. 4 a) Why should the effective structural capacity of an existing pavement earmarked for rehabilitation to extend its service life be evaluated? b) The following expression is associated with the use of the Falling Weight Deflectometer (FWD) on pavements earmarked for rehabilitation. 1.5pa d, = Mg MR %3D E, i. What is the structural transformation required to make the use of the above expression possible? Which parameters in the expression relate to the transformation? I1. Identify the parameters in the expression which are obtained from the FWD test and briefly III. describe how the setup of the test enables those parameters to be obtained. [You may use any relevant expression(s) or equation(s) to support your explanation.]

DESIGN OF A RIGID PAVEMENT1. Give a summary of rigid pavement design procedure by AASHTO method (1993), anddescribe the variables used in the method.2. Explain the CBR test; how to conduct the test and its purposes. Where are the usages oftest results in practical applications? Explain its advantages and disadvantages.3. Determine the thickness of a rigid pavement (thickness of concrete slab) by using thedata provided below:DATA PROVIDED:1. Cumulative 18kips ESAL = 5.000.0002. Overall standard deviation = 0.33. Reliability = 95%4. Design serviceability loose =1.75. Drainage coefficient = 16. Load transfer coefficient = 3.27. Mean concrete modulus of rupture = 650 psi8. Elastic modulus of the concrete to be used = 5.000.000psi9. Results of CBR test on subgrade material in the laboratory (Table 1):10. Standard force-penetration data.

DESIGN OF A RIGID PAVEMENT Give a summary of rigid pavement design procedure by AASHTO method (1993), and describe the variables used in the method. Explain the CBR test; how to conduct the test and its purposes. Where are the usages of test results in practical applications? Explain its advantages and disadvantages. Determine the thickness of a rigid pavement (thickness of concrete slab) by using the data provided below: DATA PROVIDED: Cumulative 18kips ESAL = 5.000.000 Overall standard deviation = 0.3 Reliability = 95% Design serviceability loose =1.7 Drainage coefficient = 1 Load transfer coefficient = 3.2 Mean concrete modulus of rupture = 650 psi Elastic modulus of the concrete to be used = 5.000.000psi Results of CBR test on subgrade material in the laboratory (Table 1): 10. Standard force-penetration data.