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• W601695802 abstract "For the study of the optimum thickness design of pavements and the selection of suitable road materials many approaches have been used ranging from purely theoretical calculations to observations of road experiments under heavy test traffic with special trucks. The paper describes the basic considerations which have led to finding still another way by the use of simulative fatigue testing roads in a laboratory. The equipment (pulse generators) installed at the Bundesanstalt fur strassenwesen (BAST)--Federal Road Research Institute--is explained in detail. The results of an analysis of the pattern of loading produced by truck tires and pulsed loading are compared to prove the similarity of the most important load criteria. Seventeen fatigue tests have been made by means of the pulse generators described in the paper. Each comprised 600,000 to 1,000,000 passages per track (30 cm) on the test sections built. The simulative loadings correspond to moving wheel loads of 3 - 10 Mp (approx. 30 - 100 N). The results obtained hitherto are relative to 9 selected pavements with bases of dry-bound cruched stone and asphalt-coated gravel varying in thickness, as well as to special designs with heat insulating layers of plastic foam. The bearing properties of these structures under dynamic loading are defined and the behavior of roads subjected to fatigue tests subjected to fatigue tests described. Special attention is paid to permanent surface deformations, since, in a way, this characteristic is a very interesting criteria for the description of riding quality and rutting. An attempt is described to establish an approximative law for permanent deformations in relation to the magnitude of loading and the number of load repetitions. The dependency on the load is expressed by deformation coefficients. With the reservations that the laws still have to be placed on more secure foundations by results of further fatigue tests, load equivalents have been calculated. The load equivalents are a first step towards calcualting the effect of mixed traffic, i.e., various load quantities in random sequence. In addition the real test acceleration produced by fatigue tests can be determined on the basis of load equivalents relative to a road under traffic. Before more detailed data can be stated, results from further fatigue tests must be waited for. The future program of research is breifly outlined. /AUTHOR/" @default.
• W601695802 created "2016-06-24" @default.
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• W601695802 date "1972-09-01" @default.
• W601695802 modified "2023-09-27" @default.
• W601695802 title "FATIGUE TESTS ON PAVEMENTS BY PULSE GENERATORS" @default.
• W601695802 hasPublicationYear "1972" @default.
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