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Title: IMPACT AND STATIC LOADS ON ROAD SLABS
Accession Number: 00207131
Record Type: Component
Abstract: AN ELABORATE SERIES OF TESTS WAS CONDUCTED ON ROAD SLABS (7 FEET X 7 FEET), THE RESULTS OF WHICH GIVE A FAIR INDICATION OF THE RELATIVE ROAD RESISTANCE AND THE STRESSES DEVELOPED UNDER BOTH IMPACT AND STATIC LOADS. REINFORCING STEEL IN CONCRETE SLABS, IF PRESENT IN SUFFICIENT AMOUNTS AND SO PLACED AS TO RECEIVE TENSILE STRESS, ADDS TO THE RESISTANCE OF THE SLAB TO IMPACT. HOWEVER, FABRIC REINFORCING IS MORE EFFECTIVE UNDER IMPACT LOADS THAN UNDER STATIC LOADS. IN ALL CASES THE SLABS OFFERED A GREATER RESISTANCE TO IMPACT THAN TO STATIC LOADS, THE AVERAGE RATIO OF IMPACT TO STATIC BEING 1.99 FOR SLABS ON DRY SUBGRADE AND 1.3 ON WET SUBGRADE. CONCRETE SLABS WERE NOT STRENGTHENED BY THE ADDITION OF 2 INCH BITUMINOUS TOP FOR EITHER IMPACT OR STATIC LOADS. THE IMPACT RESISTANCE OF A PLAIN CONCRETE SLAB IS GREATER ON A DRY SUBGRADE, BUT THE MAXIMUM IMPACT FIBER STRESS AT BREAKING IS APPROXIMATELY THE SAME ON THE DRY AND WET SUBGRADES. IMPACT RESULTS SHOW THAT THE HEIGHT OF DROP OF THE SAME WHEEL IS LESS FOR THE DRY SUBGRADE AND GIVES HIGHER IMPACTS THAN ON THE WET SUBGRADE.
Supplemental Notes: Vol 4, pp 42-44, 1 FIG, 1 TAB. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
Monograph Title: Monograph Accession #: 00242998
Authors: Smith, E BEditors: Upham, Charles MJanda, H FPublication Date: 1925
Serial:
Highway Research Board Proceedings
Volume: 4 Media Type: Digital/other
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Highways; Pavements
Files: TRIS, TRB
Created Date: Nov 9 1970 12:00AM
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