A flexible pavement is constructed with 225 mm (8.86 inches) wearing surface of hot-mixasphalt with high rut resistance, 275 mm (10.83 inches) of recycled mixture base (MR5 withemulsion) and 1075 mm (42.32 inches) of crushed stone (MG112) subbase.The subgrade has an effective roadbed soil resilient modulus of 20 MPa (2900 psi), and m2 andm3 are equal to 0.8 for the base and subbase.The overall standard deviation is 0.45, the initial PSI is 4.25 and the TSI (terminal serviceabilityindex) is 2.5. The materials properties are as follows:Resilient modulus of HMA = 3 592 MPa (or 521 000 psi);Resilient modulus of base (MR5 with emulsion) = 146 MPa (or 21 175 psi);Resilient modulus of subbase (MG-112) = 74 MPa (or 10 700 psi);a) How many 18-kip (80-KN) single-axle loads can be carried before the pavement reachesits TSI (terminal serviceability index) if you wanted to be 90% confident that yourestimate was not too high.b) Considering a total average daily 18-kip ESAL of 3 215, how many years would youestimate this pavement would last (how long before its PSI drops below a TSI of 2.5).c) How many years would you estimate this pavement would last if you wanted to be 99%confident.

Wearing surface of hot mix asphalt with high rut resistance - 225 mm (8.86 inch)Recycled mixture…

A flexible pavement is constructed with 225 mm (8.86 inches) wearing surface of hot-mix asphalt with high rut resistance, 275 mm (10.83 inches) of recycled mixture base (MR5 with emulsion) and 1075 mm (42.32 inches) of crushed stone (MG112) subbase. The subgrade has an effective roadbed soil resilient modulus of 20 MPa (2900 psi), and m2 and m3 are equal to 0.8 for the base and subbase. The overall standard deviation is 0.45, the initial PSI is 4.25 and the TSI (terminal serviceability index) is 2.5.

A flexible pavement is constructed with 225 mm (8.86 inches) wearing surface of hot-mix asphalt with high rut resistance, 275 mm (10.83 inches) of recycled mixture base (MR5 with emulsion) and 1075 mm (42.32 inches) of crushed stone (MG112) subbase. The subgrade has an effective roadbed soil resilient modulus of 20 MPa (2900 psi), and m2 and m3 are equal to 0.8 for the base and subbase. The overall standard deviation is 0.45, the initial PSI is 4.25 and the TSI (terminal serviceability index) is 2.5.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

A flexible pavement is constructed with 225 mm (8.86 inches) wearing surface of hot-mix
asphalt with high rut resistance, 275 mm (10.83 inches) of recycled mixture base (MR5 with
emulsion) and 1075 mm (42.32 inches) of crushed stone (MG112) subbase.
The subgrade has an effective roadbed soil resilient modulus of 20 MPa (2900 psi), and m2 and
m3 are equal to 0.8 for the base and subbase.
The overall standard deviation is 0.45, the initial PSI is 4.25 and the TSI (terminal serviceability
index) is 2.5.

The materials properties are as follows:
Resilient modulus of HMA = 3 592 MPa (or 521 000 psi);
Resilient modulus of base (MR5 with emulsion) = 146 MPa (or 21 175 psi);
Resilient modulus of subbase (MG-112) = 74 MPa (or 10 700 psi);
a) How many 18-kip (80-KN) single-axle loads can be carried before the pavement reaches
its TSI (terminal serviceability index) if you wanted to be 90% confident that your
estimate was not too high.
b) Considering a total average daily 18-kip ESAL of 3 215, how many years would you
estimate this pavement would last (how long before its PSI drops below a TSI of 2.5).
c) How many years would you estimate this pavement would last if you wanted to be 99%
confident.

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