Alabama Asphalt Pavement Association - Maintaining and Enhancing Road Infrastructure
This content highlights the challenges faced by the Alabama Asphalt Pavement Association in maintaining the existing road system due to limited funding. It emphasizes the importance of pavement preservation and the benefits to the public. Various pavement preservation techniques are discussed, along with the economic value of utilizing recycled materials in asphalt. The focus is on maximizing the lifespan of road infrastructure amidst funding constraints.
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Presentation Transcript
Alabama Asphalt Alabama Asphalt Pavement Association Pavement Association Alabama Asphalt Pavement Association 630 Adams Avenue Montgomery, AL 36104 334/834/5314 (Phone) 334/834/5537 (Fax) E-mail: alapa@bellsouth.net Web site: www.alasphalt.com 1
ALDOT And County Funds Are Limited And Are Expected To Remain Limited. ALDOT And County New Construction Projects Are Becoming Rare. If You Can Not Afford To Maintain Existing System, Why Add New To System? ALDOT And County Priority Is Maintaining Current System. 3
Why Thin Lift Asphalt? Specifications For Thin Lift Asphalt. Economic Value Of RAP And RAS Future - Other HMA Pavement Preservation Options
Funding Crisis Escalating Construction Cost Flat Revenue Fewer Road Miles Less New Construction Dollars Revenue Time
Benefits To The Traveling Public Improved Ride Improved Smoothness Public Perception Freshly Paved Road New Road Public Perception No Broken Windshields Local / In State Contractors Contributing To Tax Base And Employment At Local / State Level
Thin Lift Micro- Surface Scrub Seal Chip Seal Corrects Surface Distress Increase Skid Resistance Minimizes Curb Loss Can Be Applied In One Pass Eliminates Loose Aggregate Corrects Minor Rutting Minimizes Delamination Improves Ride Quality Increases Structural Strength Improves Pavement Drainage And Pavement Cross Slope
SuperPave Mix ALDOT Uses Maximum Aggregate Size Mixes Finer Gradation Than Old ALDOT Section 416, Mix 6 12
Sieve Size 3/8 Inch Mix Section 416 , Mix 6 100 100 95 - 100 90 - 100 3/8 #4 75 -100 65 - 82 #16 30 - 60 32 - 49 #200 6 - 12 3 - 9 13
FAA Greater Than Or Equal To 43 For Less Than 1 Million 20 Year Design ESALs. FAA Greater Than Or Equal To 45 For Between 1 Million And 30 Million 20 Year Design ESALs. 15
Varies From A Maximum of 30% To A Maximum of 50% Depending Upon BPN 9 Value of Aggregate Source. 16
PG 67-22 Required For Less Than 10 Million 20 Year Design ESALs. PG 76-22 Required For Between 10 Million And 30 Million 20 Year Design ESALs. 17
Design Gyration Of 60 Gyrations. Minimum Design AC Content Of 5.90%For Mixes Without RAS. Minimum Design AC Content Of 6.10% For Mixes With RAS. 18
Design Air Voids Of 4.0% For Mixes Without RAS. Design Air Voids Of 3.5% For Mixes With RAS. Minimum Design VMA Of 16.5% And Maximum Design VMA Of 18.0% With A 0.5% Production VMA Tolerance. Dust Proportion Range Of 0.90 To 2.00 Based On Effective Asphalt Content. TSR Minimum Of 0.80. 19
Spread Rate Can Be Specified From A Minimum of 80 Pounds Per Square Yard (0.72 Inches)To A Maximum Of 110 Pounds Per Square Yard (0.99 Inches). Density Requirement Is To Satisfaction Of Engineer. Typically A Roller Pattern Using Non Destructive Density Gauges. 20
Maximum 20% RAP Use. Maximum 5% RAS Use. Warm Mix Asphalt Allowed As Contractor Option On All Superpave Mixes. 21
ALDOT Job Special For County Use Prohibiting Use of RAS In 3/8 Mixes. 22
ALDOT General Use Special Provision For All Size Wearing Surface Mixes. Reduce Allowable Maximum RAS Limit From 5% To 3%. Require Air Temperature To Be At Least 50F And Rising Before Placing Wearing Surface Mixes Containing RAS. Prohibit Ground Blending Of RAS At HMA Plant. Require RAS To Be Metered In At HMA Plant. 23
No Structural Failures Reported. No Major Performance Issues Reported. No Friction Number Issues Reported. 24
50% Limestone Screenings. 38% Granite Screenings. 10% Sand. 2% Baghouse Fines. Design Asphalt Content : 6.25%. 25
Value Of RAP Assume AC Liq. Ton @ $320.00 / Ton Assume Virgin Agg. @ $ 15.00 / Ton RAP - 5% AC And 95% Aggregate Per Ton Value Of RAP .05 x $320.00 = $16.00 .95 x $ 15.00 = $14.25 One Ton Of RAP = $ 30.25* *Does not include costs to mill, haul and process
Value Of RAS Assume AC Liq. Ton @ $320.00 / Tn Assume Virgin Agg. @ $ 15.00 / Tn RAS - 20% AC And 35% Aggregate Per Ton Value Of RAS .20 x $320.00 = $64.00 .35 x $ 15.00 = $ 5.25 One Ton Of RAS = $69.25* *Does Not Include Costs To Haul, Process, And Store.
Alabama Asphalt Alabama Asphalt Pavement Association Pavement Association Alabama Asphalt Pavement Association 630 Adams Avenue Montgomery, AL 36104 334/834/5314 (Phone) 334/834/5537 (Fax) E-mail: alapa@bellsouth.net Web site: www.alasphalt.com 34
