00741957

Component

https://doi.org/10.3141/1577-02

http://scholar.google.com...yder&publication_year=1997

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.

This paper appears in Transportation Research Record No. 1577, Pavement Base and Foundation Materials, Deformation Characteristics of Subgrade, and Properties of Unconventional Aggregates.

English

p. 10-17

1997

Transportation Research Record

0309061598

References (15)

Base course (Pavements); Calcites; Chemical reactions; Concrete aggregates; Drainage; Environmental impacts; Leachate; pH value; Recycled materials

Environment; Geotechnology; Highways; Hydraulics and Hydrology; I36: Aggregates

TRIS, TRB, ATRI

Oct 17 1997 12:00AM

• ALTERNATIVE METHOD OF DETERMINING RESILIENT MODULUS OF COMPACTED SUBGRADE SOILS USING FREE-FREE RESONANT COLUMN TEST
• ANISOTROPIC MODELING OF GRANULAR BASES IN FLEXIBLE PAVEMENTS
• APPLICATION OF GEOTECHNICAL CENTRIFUGE TESTING TO EVALUATE UNCONVENTIONAL HIGHWAY MATERIALS
• BEHAVIOR OF SOME PAVEMENT FOUNDATION MATERIALS UNDER REPEATED LOADING
• FIELD PERFORMANCE AND MITIGATION OF SHREDDED TIRE EMBANKMENT
• FIELD VERIFICATION OF LABORATORY RESILIENT MODULUS MEASUREMENTS ON SUBGRADE SOILS
• GEOTECHNICAL AND ENVIRONMENTAL CHARACTERISTICS OF ATMOSPHERIC FLUIDIZED BED COMBUSTION ASH AND STOKER ASH
• KANSAS EXPERIENCE WITH STRATEGIC HIGHWAY RESEARCH PROGRAM WASHINGTON HYDRAULIC FRACTURE INDEX TEST
• PERSPECTIVES ON LIABILITY FOR CONSTRUCTIVE REUSE OF HIGH-VOLUME WASTE STREAMS
• SEASONAL VARIATION OF BACKCALCULATED SUBGRADE MODULI
• SHEAR AND DEFORMATION CHARACTERISTICS OF MUNICIPAL WASTE COMBUSTOR BOTTOM ASH FOR HIGHWAY APPLICATIONS
• TRIAXIAL CHARACTERIZATION OF MINNESOTA ROAD RESEARCH PROJECT GRANULAR MATERIALS
• USING SUCTION AND DIELECTRIC MEASUREMENTS AS PERFORMANCE INDICATORS FOR AGGREGATE BASE MATERIALS