A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Geotextile and base aggregate support long-term pavement testing by FHWA. Installed in 1993
A major deterioration factor in pavements is the progressive loss of effective aggregate base thickness because of contamination by subgrade soil. In the service life of a pavement, subgrade soil fines migrate upward into the unbound base aggregate and some of the aggregate can push down into the subgrade soil. In 1993, FHWA researchers wisely protected the pavement base aggregate layer under the ALF at the TFHRC in McLean, Va., using a separation/stabilization geotextile layer. The ALF conducts accelerated pavement testing and applies years of heavy highway truck traffic in a repetitive fashion in a relatively short period of time. In this facility, different pavement setups were tested during the last 20 years, which imposed the equivalent of more than 8 million ESALs or 18,000-lb. axle loads. When each pavement was rebuilt, the surface layers were removed and only the upper portion of the aggregate base was reconditioned. The lower part of the unbound aggregate base was left undisturbed. It was particularly critical for this test facility to maintain the same effective lower base section from test to test so there could be a credible comparison between the different upper pavement structures and treatments FHWA evaluated.
Geotextile and base aggregate support long-term pavement testing by FHWA. Installed in 1993
A major deterioration factor in pavements is the progressive loss of effective aggregate base thickness because of contamination by subgrade soil. In the service life of a pavement, subgrade soil fines migrate upward into the unbound base aggregate and some of the aggregate can push down into the subgrade soil. In 1993, FHWA researchers wisely protected the pavement base aggregate layer under the ALF at the TFHRC in McLean, Va., using a separation/stabilization geotextile layer. The ALF conducts accelerated pavement testing and applies years of heavy highway truck traffic in a repetitive fashion in a relatively short period of time. In this facility, different pavement setups were tested during the last 20 years, which imposed the equivalent of more than 8 million ESALs or 18,000-lb. axle loads. When each pavement was rebuilt, the surface layers were removed and only the upper portion of the aggregate base was reconditioned. The lower part of the unbound aggregate base was left undisturbed. It was particularly critical for this test facility to maintain the same effective lower base section from test to test so there could be a credible comparison between the different upper pavement structures and treatments FHWA evaluated.
Geotextile and base aggregate support long-term pavement testing by FHWA. Installed in 1993
Marienfeld, Mark (author) / Chuck, Fred (author)
Geosynthetics ; 32 ; 12-18
2014
7 Seiten, Bilder, Tabellen
Article (Journal)
English
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