05 asphalt institute

Information about 05 asphalt institute

Published on February 26, 2008

Author: Mentor

Source: authorstream.com

Content

Asphalt Institute Flexible Pavement Structural Design:  Asphalt Institute Flexible Pavement Structural Design Outline:  Outline Origins Overview Example Problem Origins:  Origins Asphalt Institute Manual Series 1 (MS-1) From the Chevron N-layer method Published in 1981 Procedure Uses graphs in MS-1 Uses a PC-based program Overview:  Overview Mechanistic-empirical design Limit tensile strain on bottom of HMA layer Limit vertical strain on top of subgrade Subgrade:  Subgrade Uses Resilient modulus (MR) Procedure to select design MR Estimating ESALs:  Estimating ESALs Uses “Truck Factors” Average ESALs for a given truck type Truck Distribution - Rural:  Truck Distribution - Rural From MS-1, Table IV-1 Truck Distribution – Urban:  Truck Distribution – Urban From MS-1, Table IV-1 Truck Factors – Rural:  Truck Factors – Rural From MS-1, Table IV-5 Truck Factors – Urban:  Truck Factors – Urban From MS-1, Table IV-5 Limitations:  Limitations Most data over 20 years old Does not consider top down cracking Core from Makakilo Dr. Asphalt Institute Method:  Asphalt Institute Method Example Step 1: Traffic Calculation:  Step 1: Traffic Calculation Total ESALs Buses + Trucks 2.13 million + 1.33 million = 3.46 million Step 2: Get MR Value:  Step 2: Get MR Value CBR tests along Kailua Road show: CBR ≈ 8 MR conversion AASHTO Conversion NCHRP 1-37A Conversion This is different from your notes, but consistent with the other examples. Step 3: Select Climate:  Step 3: Select Climate Determines HMA & subgrade properties Can select mean annual air temperature (MAAT): 45°F (frost effects) 60°F (possible frost effects) 75°F (no frost effects) Software allows more selections Step 4: Calculate Design:  Step 4: Calculate Design Decide on basic structure HMA Aggregate base (6 or 12 inches) Software allows for more choices Can also choose Full-depth asphalt HMA over emulsified asphalt base Step 4: Calculate Design:  Step 4: Calculate Design Use graph Source: Asphalt Institute, MS-1, 1981 Step 4: Calculate Design:  Step 4: Calculate Design Final Design 9.5 inches HMA 2.5 inches Mix IV (½ inch Superpave) 7 inches ACB (¾ inch Superpave) 12 inches aggregate base 6 inches UTB 6 inches aggregate subbase Comparison:  Comparison

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