Pavement

Cover of Polyphosphoric Acid Modified Binders
Polyphosphoric Acid Modified Binders
  • Publication no: AP-T87-07
  • ISBN: 978-1-921329-28-9
  • Published: 22 October 2007
This report provides a general overview of polyphosphoric acid modified binder. A modification mechanism between the acid and binder was proposed. The addition of acid was found to change the chemical compositions of the binder noticeably. The strength and weaknesses of this modified binder were also demonstrated in the report. The most outstanding advantage is the improvement in temperature susceptibility. The main concern about this modified binder is the unknown side reactions happening between an anti stripping agent and the acid in the binder.
  • AP-T87/07 Polyphosphoric Acid Modified Binders
  • 1. INTRODUCTION
  • 2. POLYPHOSPHORIC ACID (PPA)
  • 3. BITUMEN PROCESSING ROUTE
    • 3.1. Introduction
    • 3.2. Catalytic Air Blowing Process
    • 3.3. Addition of PPA to Bitumen
  • 4. POLYPHOSPHORIC ACID AS A MODIFIER
    • 4.1. Introduction
    • 4.2. Selection of PPA as an Air Blowing Catalyst
    • 4.3. Recovery/Detection of the Catalyst and Modifier in the Blowing Process
    • 4.4. Proposed Modification Mechanism when PPA is Added to Bitumen
    • 4.5. Change in Chemical Composition
    • 4.6. Change in Bitumen Structure
  • 5. PROPERTIES OF PPA MODIFIED BINDERS
    • 5.1. Introduction
    • 5.2. Advantages
    • 5.3. Challenges faced
  • 6. CONCLUSIONS
  • REFERENCES