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- W587359056 abstract "BECAUSE OF THE EXTENSIVE MILEAGE OF SEMI-RIGID ROADS IN FRANCE, INVESTIGATIONS WERE CARRIED OUT TO DEVELOP METHODS OF INVESTIGATION ADAPTED TO THIS TYPE OF PAVEMENT. SEVERAL AVENUES WERE EXPLORED AND, FINALLY, IT WAS DECIDED THAT THE COLLOGRAPH WAS AN ANSWER TO THE PROBLEM. THE COLLOGRAPH IS USED FOR THE DYNAMIC TESTING OF PAVEMENTS; IT CONSISTS MAINLY OF A VIBRATING MASS ROLLING ALONG THE CARRIAGEWAY AND OF A ROLLING TRANSDUCER WHICH CONTINUOUSLY RECORDS THE AMPLITUDE OF THE VERTICAL DEFORMATIONS OF THE PAVEMENT TESTED. THE WHOLE MACHINE OPERATES AT 60 HZ, AT A SPEED OF 4 OR 5 KM/H. SPALLING OR CRACKING IS SHOWN ON THE RECORDING APPARATUS BY A MARKED INCREASE IN THE AMPLITUDE OF THE DEFORMATIONS. THE COLLOGRAPH PERMITS THE DETECTION OF BOTH TYPES OF DEGRADATION AT A SUFFICIENTLY EARLY STAGE TO OBVIATE IMPORTANT REPAIR OPERATIONS. THIS TYPE OF EQUIPMENT CAN ALSO BE USED TO INVESTIGATE MECHANICAL DEFECTS IN ANY KIND OF STRUCTURE (RIGID PAVEMENTS, CAVITIES, ETC.). THE COLLOGRAPH GIVES QUALITATIVE RESULTS. TO OBTAIN QUANTITATIVE RESULTS, CONTINUOUS MEASUREMENTS OF DYNAMIC DEFLECTION MUST BE UTILIZED." @default.
- W587359056 created "2016-06-24" @default.
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- W587359056 date "1976-01-01" @default.
- W587359056 modified "2023-09-23" @default.
- W587359056 title "NONDESTRUCTIVE TESTING OF SEMI-RIGID PAVEMENTS BY MEANS OF A HIGH-OUTPUT APPARATUS - THE COLLOGRAPH" @default.
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