The use of recycled portland cement concrete aggregate in pavement base layers has been associated with the reduction of filter fabric permittivity and the accumulation of calcite precipitate and other materials in pavement subdrainage systems. A mechanism of portlandite dissolution within base-layer pore waters, followed by exposure to atmospheric carbon dioxide via subdrainage systems, and subsequent calcite precipitation is explored using chemical thermodynamic techniques. Ion activities and pH levels are estimated for the equilibrium states of rainwater entering the pavement, base-layer pore water isolated from the atmosphere, and subdrainage water exposed to the atmosphere. Results derived agree with field and laboratory observations of pH levels.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Chemical Approach to Formation of Calcite Precipitate from Recycled Concrete Aggregate Base Layers


    Additional title:

    Transportation Research Record


    Contributors:


    Publication date :

    1997-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Structural Lightweight Concrete Containing Recycled Lightweight Concrete Aggregate

    Wongkvanklom, Athika / Posi, Patcharapol / Khotsopha, Banlang et al. | Online Contents | 2018


    The application of Recycled Concrete Aggregate (RCA) for Hot Mix Asphalt (HMA) base layer aggregate

    Cho, Yoon-Ho / Yun, Taeyoung / Kim, In Tai et al. | Springer Verlag | 2011


    Structural Lightweight Concrete Containing Recycled Lightweight Concrete Aggregate

    Wongkvanklom, Athika / Posi, Patcharapol / Khotsopha, Banlang et al. | Springer Verlag | 2017


    Development of Aggregate Avoidance Index for Evaluating Recycled Aggregate Concrete

    Akkari, Alexandra Kamilla / Izevbekhai, Bernard Igbafen / Olson, Steven Charles | Transportation Research Record | 2014