The National Airport Pavement Test Facility (NAPTF) is a state-of-the-art full-scale test facility operated by the U.S. Federal Aviation Administration (FAA). The NAPTF is located at the William J. Hughes Technical Center near Atlantic City, New Jersey and it provides high quality, accelerated test data from rigid and flexible pavements subjected to simulated aircraft traffic. During the first ...

This investigation discusses the findings on analysis results of a pavement structure constructed on a relatively expansive material consisting mainly of brown clayey silt in Tebessa, Algeria. Cores were brought to the laboratory from a piece of roadwork. Remolded samples were taken from subgrade of a deteriorated road. The soils were generally found to be of medium plasticity and of a medium t...

Another larger structure which is somewhat unusual is a 54-foot oolitic limestone arch bridge, carrying a stabilized gravel road 22 feet wide with a five-foot sidewalk on one side. This bridge spans McCormick's Creek a few hundred feet above the falls and carries the picnic ground road from the hotel to the Beech Grove area. This structure was built by the CCC camp which was located there for a...

Unbound granular pavement layers show a characteristic increase in moduli from the subgrade to the surface. The ratio of moduli between successive layers provides a direct and effective measure of pavement quality that makes due allowance for site conditions and seasonal effects beyond a contractor’s control. The modular ratio is therefore an effective indicator for performance-based specificat...

In the field of civil engineering and architecture, concept symmetry has been widely accepted. The bridge can be treated as a typical symmetrical structure buildings. Among them, Subgrade identified an important part to bear vehicle loads. Severe pavement problems service capabilities will caused by bridge–subgrade transition section. Therefore, setting rigid–flexible is method solve this probl...

A ballasted railway track system comprises several components among which steel rails, rail fasteners, timber, steel or concrete sleepers, granular ballast, sub-ballast, and subgrade materials are the main parts. Railway track systems are constructed to provide a smooth and safe running surface for passenger or freight trains. They are designed to sustain the force of lateral, longitudinal and ...

Figure 2. Bearing capacity determined from astronaut bootprints (Modulus of Subgrade Reaction) [2]. Inset (upper left) shows a cross-section of bootprint and the forces involved. Other parameters can be measured using the astronaut’s boot or walking stick. They include surface temperature, dust accumulation, and penetrometry. These and other sensors will provide useful material information to g...

One of the efficient techniques to improve the behavior of the paved road under traffic loads is implementing the geosynthetic material in the sub-base or the soil under the road. In the past years, many researches have been done about this topic, but the study on the effect of soil/load conditions on the performance of the rehabilitated paved road by geogrid in order to investigate the effecti...