logging in or signing up 05 asphalt institute Mentor Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 1162 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: February 26, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Asphalt Institute Flexible Pavement Structural Design: Asphalt Institute Flexible Pavement Structural DesignOutline: Outline Origins Overview Example ProblemOrigins: 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 programOverview: 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 MREstimating ESALs: Estimating ESALs Uses “Truck Factors” Average ESALs for a given truck type Truck Distribution - Rural: Truck Distribution - Rural From MS-1, Table IV-1Truck Distribution – Urban: Truck Distribution – Urban From MS-1, Table IV-1Truck Factors – Rural: Truck Factors – Rural From MS-1, Table IV-5Truck Factors – Urban: Truck Factors – Urban From MS-1, Table IV-5Limitations: Limitations Most data over 20 years old Does not consider top down cracking Core from Makakilo Dr.Asphalt Institute Method: Asphalt Institute Method ExampleStep 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 selectionsStep 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, 1981Step 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 subbaseComparison: Comparison You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
05 asphalt institute Mentor Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 1162 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: February 26, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Asphalt Institute Flexible Pavement Structural Design: Asphalt Institute Flexible Pavement Structural DesignOutline: Outline Origins Overview Example ProblemOrigins: 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 programOverview: 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 MREstimating ESALs: Estimating ESALs Uses “Truck Factors” Average ESALs for a given truck type Truck Distribution - Rural: Truck Distribution - Rural From MS-1, Table IV-1Truck Distribution – Urban: Truck Distribution – Urban From MS-1, Table IV-1Truck Factors – Rural: Truck Factors – Rural From MS-1, Table IV-5Truck Factors – Urban: Truck Factors – Urban From MS-1, Table IV-5Limitations: Limitations Most data over 20 years old Does not consider top down cracking Core from Makakilo Dr.Asphalt Institute Method: Asphalt Institute Method ExampleStep 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 selectionsStep 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, 1981Step 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 subbaseComparison: Comparison