Lesson 1/Learning Event 4
Problem #1: T/O Road Design
Design a T/O Road with a design life of 2 years. It has the following anticipated daily traffic:
The following materials are available:
Surface
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Asphalt Concrete Pavement, Surface Treatment
Base
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Graded, Crushed Aggregate, Borrow Material, GP-GC
Subbase
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CBR = 40, Max. size = 2", 57% passes through the #10
sieve, 12% passes through the #200 sieve, LL = 8, PI = 4
Select
-
None
Subgrade
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ML-CL, PI = 15, CBR = 10
Solution:
Step 1 Check Materials
(1) The base material has a CBR of 100. (Table 3)
(2) The borrow material meets the criteria for CBR 40. (Table 12)
Step 2 Determine EODL (Figure 6)
Step 3 - Determine Cover Requirements (Figure 8)
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