Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Foamed Asphalt Stabilized Base: A Case Study
Foamed asphalt stabilized base (FASB) combines reclaimed asphalt pavement (RAP) and/or recycled concrete (RC) with a foamed asphalt binder. The pavement structural properties of FASB fall somewhere between conventional graded aggregate base (GAB) and hot mix asphalt (HMA). Therefore, the required thickness of the pavement section can be reduced, resulting in cost savings in addition to recycling benefits. This case study was conducted on an 8-inch FASB layer constructed during May to July 2011 on MD Route 295 near Baltimore-Washington International (BWI) Airport. The primary objective of the project was to evaluate the suitability of using this material in high traffic volume pavements and to assess its fundamental engineering properties. FASB density, moisture content, and hydraulic properties were evaluated in the field, and its stiffness was monitored as the material dried and cured during the first week and at 4 to 6 months after placement. Field tests included nuclear moisture and density gauge readings, permeability assessment, and stiffness measurements using a lightweight deflectometer (LWD), a GeoGauge, and a falling weight deflectometer (FWD). Of particular interest was the increase in stiffness of the FASB with time during curing and the comparison of this increase with that observed in a companion GAB control section at the site. Overall, the final field-cured stiffness of the FASB was found to be substantially higher than that for GAB. Recommendations on appropriate installation methodologies, weather constraints, and QC/QA methods are provided.
Foamed Asphalt Stabilized Base: A Case Study
Foamed asphalt stabilized base (FASB) combines reclaimed asphalt pavement (RAP) and/or recycled concrete (RC) with a foamed asphalt binder. The pavement structural properties of FASB fall somewhere between conventional graded aggregate base (GAB) and hot mix asphalt (HMA). Therefore, the required thickness of the pavement section can be reduced, resulting in cost savings in addition to recycling benefits. This case study was conducted on an 8-inch FASB layer constructed during May to July 2011 on MD Route 295 near Baltimore-Washington International (BWI) Airport. The primary objective of the project was to evaluate the suitability of using this material in high traffic volume pavements and to assess its fundamental engineering properties. FASB density, moisture content, and hydraulic properties were evaluated in the field, and its stiffness was monitored as the material dried and cured during the first week and at 4 to 6 months after placement. Field tests included nuclear moisture and density gauge readings, permeability assessment, and stiffness measurements using a lightweight deflectometer (LWD), a GeoGauge, and a falling weight deflectometer (FWD). Of particular interest was the increase in stiffness of the FASB with time during curing and the comparison of this increase with that observed in a companion GAB control section at the site. Overall, the final field-cured stiffness of the FASB was found to be substantially higher than that for GAB. Recommendations on appropriate installation methodologies, weather constraints, and QC/QA methods are provided.
Foamed Asphalt Stabilized Base: A Case Study
Khosravifar, Sadaf (Autor:in) / Schwartz, Charles W. (Autor:in) / Goulias, Dimitrios G. (Autor:in)
2013 Airfield & Highway Pavement Conference ; 2013 ; Los Angeles, California, United States
Airfield and Highway Pavement 2013 ; 106-117
18.06.2013
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Laboratory Evaluation of Foamed Asphalt Stabilized Base Materials
| British Library Conference Proceedings | 2012
Base Stabilization with Foamed Asphalt
| NTIS | 1979
| TIBKAT | 1959