IMG_0004

# IMG_0004 - Fall 2006 Exam 2 7 Name(last ﬁrst CE 211 Trans...

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Unformatted text preview: Fall 2006 Exam 2 7 Name: (last, ﬁrst) , CE 211 Trans. Engineering Problem 4 (10 points) A three layer ﬂexible pavement for a highway is to be designed using the AASHTO Guide Method for Ely/0900 l8 kip single axle load repetitions (W13) and the following: Initial serviceability index 2 4.5 Layer coefﬁcients eqs.: Reliability = 95" 0 ai = 0.249log(Ei)—0.977 where i = asp or base Standard deviation = 0.45 / ”/é‘sufo_22710g(Esub)—o.839 Top layer (HMAC) E = 400,000 psi/ //7 Base layer (crushed stone) E = 26,000 psi/ Subbase layer (gravel) E = 10,000 psi/ Subgrade (sandy clay) M; = 5,495 psi If, 5, § ’X N) If the above p ement structure will be exposed to moisture levels approaching saturation approximately 25% f the time and the quality of drainage for the project is excellent. Calculate the thickness of the pav‘cment‘s layers (chart and table are attached, don’t remove them). Assume an appropriate value of terminal serviceability. ? L A; 1 5' L33§~ ES 17’ ...
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