Abstract
In recent years, the use of foamed bitumen technology along with Reclaimed Asphalt Pavement is gaining popularity across the world. The mechanical response of foamed bitumen mixtures containing reclaimed asphalt pavement is significantly influenced by constituent material properties and aggregate gradation. This article presents results from a study where foamed bitumen mixtures conforming to Indian specifications were evaluated. For this purpose, foamed bitumen mixtures using a different percentage of reclaimed asphalt pavement and bitumens were prepared. Initially, the foaming characteristics of virgin bitumens were evaluated to optimize for optimum water content and foaming temperature. In the second stage, mixture design was conducted to optimize for foamed bitumen content in foamed bitumen mixtures containing a different percentage of reclaimed asphalt pavement. Finally, these foamed bitumen mixtures were evaluated for their mechanical properties. The results from this laboratory study indicated properties of foamed bitumen and foamed mixtures are significantly influenced by properties of bitumen, the quantity of bitumen, and reclaimed asphalt pavement. Among the different mixtures, a mixture containing 50% reclaimed asphalt pavement exhibited best results in resilient modulus and resistance to moisture damage tests. A mixture containing 80% reclaimed asphalt pavement also shows acceptable strength and resistance to water susceptibility. Thus, it is possible to design high-quality bituminous mixes using higher reclaimed asphalt pavement percentages, which meet the required volumetric and desired performance criteria.
Highlights
Depletion of raw materials in many parts of the world has necessitated the adoption of various technologies in pavement design and construction
This article presents results from a study where Foamed Bituminous Mixtures conforming to Indian specifications were evaluated
Higher Reclaimed Asphalt Pavement content in Foamed Bituminous Mixtures resulted in higher optimum moisture content and lower dry density
Summary
Depletion of raw materials in many parts of the world has necessitated the adoption of various technologies in pavement design and construction. The use of Reclaimed Asphalt Pavement (RAP) materials in asphaltic mixtures is a popular construction practice across the world. Cold In-Place Recycling essentially consists of milling the existing distressed pavement to a predetermined depth and this material is mixed with foamed bitumen or emulsion. With CIR process, the construction time is reduced when compared to alternative rehabilitation methods. The percentage of RAP was varied within each mixture These mixtures were tested for their mechanical and volumetric properties.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
