2,004 research outputs found
Indirect diagnosis of pavement structural damages using surface GPR reflection techniques
No full textThe safety and operability of road networks is, in part, dependent on the quality of the pavement. It is known that pavements
suffer from many different structural problems which can lead to damage to the pavement surface. To minimize the effect of these
problems programmed policies for pavement management are required. Additionally a given local anomaly on the road surface can
affect the safety of the road to various degrees according to the category of the road, so it is possible to set up different programmes
of repair according to the different standards of road.
Programmed policies for pavement management are required because of the wide structural damage which occurs to pavements
during their normal operating life. This has consequences for the safety and operability of road networks. During the last decade,
road networks suffered from great structural damage. The damage occurs for different reasons, such as the increasing traffic or the
lack of means for routine maintenance. Many forms of damage, originating in the bottom layers are invisible until the pavement
cracks. They depend on the infiltration of water and the presence of cohesive soil greatly reduces the bearing capacity of the subasphalt
layers and underlying soils. On the basis of an in-depth literature review, an experimental survey with Ground Penetrating
Radar (GPR) was carried out to calibrate the geophysical parameters and to validate the reliability of an indirect diagnostic method
of pavement damage. The experiments were set on a pavement under which water was injected over a period of several hours. GPR
travel time data were used to estimate the dielectric constant and the water content in the unbound aggregate layer, the variations in
water content with time and particular areas where rate of infiltration decreases. A new methodology has been proposed to extract
the hydraulic permittivity fields in sub-asphalt structural layers and soils from the moisture maps observed with GPR. It is effective
at diagnosing the presence of clay or cohesive soil that compromises the bearing capacity of sub-base and induces damage
Информационное обеспечение системы социальной защиты
No full textThe article is about the features and problems of informational ensuring of the social protection system in Russia. The author analyzes the current practice of informational ensuring system of social protection, pointing out the flaws. The author proposes possible variants solutions to problems
Design and Cahracterization of a 10-Gb/s Dual Drive Z-Cut Ti:LiNbO3 Electrooptical modulator
No full text
Citizen education by involvement in marine biodiversity monitoring.
No full textCITIZEN EDUCATION BY INVOLVEMENT IN MARINE BIODIVERSITY MONITORING
S. Goffredo, P. Neri, A. Orlandi, F. Pensa, M. Scola Gagliardi, A. Velardi, C. Piccinetti, F.
Zaccant
Experimental Study on the Efficiency of Trimaran Configuration for High-Speed Very Large Ships
No full textSelezionato fra i "Papers of Distinction" dal CEMT (ex WEMT
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