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- W590935610 abstract "THE ELECTRICAL RESISTIVITY TESTS HAVE BEEN ADAPTED TO DETERMINE THE THICKNESS OF CONCRETE PAVEMENTS. THE TEST INVOLVES MEASURING THE RESISTANCE TO THE PASSAGE OF AN ELECTRIC CURRENT THROUGH THE SELECTED MEDIUM. IT IS MADE BY USING FOUR ELECTRODES EQUALLY SPACED IN A LINE ON THE SURFACE OF THE MATERIAL BEING TESTED. FOUR SMALL PLASTIC TUBES, PLUGGED WITH STIFF CLAY AND FILLED WITH A SATURATED SOLUTION OF COPPER SULFATE INTO WHICH A COPPER WIRE IS INSERTED, ARE USED IN THE TEST. THE CLAY, WITH THE HELP OF A SLIGHT WETTING OF THE CONCRETE SURFACE, PROVIDES A SUITABLE CONTACT FOR THE ELECTRICAL CIRCUITS WITH THE PAVEMENT SURFACE. A CONCRETE PAVEMENT HAS A RESISTIVITY CHARACTERISTIC THAT USUALLY DIFFERS FROM THAT OF THE UNDERLYING SOIL OR BASE LAYERS. USING THE MOORE CUMULATIVE CURVE METHOD OF DEPTH DETERMINATION, IT IS POSSIBLE TO DRAW STRAIGHT-LINE PORTIONS OF THE CUMULATIVE CURVE TO INTERSECT IN THE VICINITY OF THE TREND APPEARING IN THE FIELD CURVE, THE DEPTH AT WHICH THE INTERSECTION IS OBTAINED BEING EQUATED TO THE THICKNESS OF THE LAYER UNDER TEST. RESULTS OF 150 TESTS, MADE ON BOTH UNREINFORCED AND REINFORCED CONCRETE SLABS AND BRIDGE DECKS, HAVE BEEN GOOD. SPECIFIC TESTS ARE REPORTED ON CONCRETE ROADWAY PAVEMENT, AND CONCRETE BRIDGE SLABS. MORE TESTING IS NEEDED TO DETERMINE THE EFFECTIVENESS OF THE PROPOSED TEST PROCEDURE UNDER ALL FIELD CONDITIONS." @default.
- W590935610 created "2016-06-24" @default.
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- W590935610 date "1968-01-01" @default.
- W590935610 modified "2023-09-26" @default.
- W590935610 title "EARTH-RESISTIVITY TESTS APPLIED AS A RAPID, NONDESTRUCTIVE PROCEDURE FOR DETERMINING THICKNESS OF CONCRETE PAVEMENTS" @default.
- W590935610 hasPublicationYear "1968" @default.
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