Causes and Solutions Raveling Causes? 1. Asphalt Binder has hardened excessively
2. Poor Quality Mixture 3. Broken Bond between aggregate and asphalt
4. OXIDATION 5. Water / Traffic ISSUE SUMMARY
Dry Mix Poor Base / Subgrade Drainage Inadequate binder grade Increased oxidation Poor construction Recycled Materials Huge push for recycled pavements in
order to preserve the environment as well as reducing waste and aid in producing a cost effective mix to construct your roadways. Cost Savings Environmentally responsible BEST PRACTICES WITH RECYCLE
QUESTION: Can recycling can be done responsibly and still provide performance as well as cost effectiveness? ANSWER: YES with design changes and rejuvenators UNDERSTANDING YOUR INPUTS The key to effective design is understanding the products you are incorporating
Aggregate RAP RAS Liquid Binder Additives Hot Topic REJUVENATORS
Rejuvenation to restore youthful vigor; make young again Softening Agent substance added to a textile in finishing to give a softer handle Oxidation ? Asphalts exposure to oxygen begins a molecular process
that causes new polar bonding sites. The increase of the polar sites allow molecules to shuffle looking for bonds that bring it to a thermodynamic stable state. Selfassemblage makes the bonds tighter resulting in a stiffer and brittle pavement How much time do we have?
1. Exposure 2. Time 3. Temperature Where does oxidation occur? Asphalt Storage Temperatures Mixing Temperatures at Plant Silo Time
UV and Oxygen Exposure Brittle Binder Decreased Decreased Flexibility Flexibility
52.0-34.8 T5RC WITH 30% RAP PG78-20 T5RC WITH 27%RAP/3% RAS PG90-12 Field Data Add Rejuvenator T5RC WITH 27%RAP/3% RAS
T5RC WITH 25%RAP/5% RAS PG75-23 PG81-22 HAMBURG WHEEL-TRACKER Source: Laboratory Performance of Green Asphalt in Flexible Pavement Systems
HAMBURG RESULTS Source: Laboratory Performance of Green Asphalt in Flexible Pavement Systems SCB Source: Laboratory Performance of Green Asphalt in Flexible Pavement Systems SCB RESULTS
Source: Laboratory Performance of Green Asphalt in Flexible Pavement Systems TSRST Source: Laboratory Performance of Green Asphalt in Flexible Pavement Systems TRST RESULTS
Source: Laboratory Performance of Green Asphalt in Flexible Pavement Systems TEXAS OVERLAY Source: FHWA/TX-14/0-6614-3 $$$$$$$ SUMMARY
Recycle is necessary to maintain roads under current budget To uphold quality of the recycled mixes, rejuvenators are a necessity Design changes are necessary to increase effective binder in mix Final product must be fairly evaluated Questions Grant Wollenhaupt
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They already have access to a digital account which will present them with an increasingly personalised picture of their tax affairs, along with prompts, advice and support through webchat and secure messaging.
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