Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Dielectric Measurements of Asphalt Content
The differences in dielectric properties of asphalt and aggregates suggest that an inexpensive instrument might be developed which could determine asphalt content by measurements of this difference. Blackwell Electronic Laboratories of Denver and the Department of Highways, State of Colorado, investigated this possibility during fiscal 1966-67. In the experiments, the dielectric constant of typical asphalt mixes was determined by measuring the change in capacitance of a parallel resonance circuit. The dielectric loss was determined by measuring the voltage of the resonance circuit. Frequencies used were from 500 to 200,000 cycles per second. A variety of combinations of capacitor plates and electrodes were used to obtain output values. After considerable work, it was tentatively concluded that the dielectric readings were as dependent upon the density of the mix as on the asphalt content. To measure asphalt content it will be necessary to control or measure the density of the sample. (BPR abstract)
Dielectric Measurements of Asphalt Content
The differences in dielectric properties of asphalt and aggregates suggest that an inexpensive instrument might be developed which could determine asphalt content by measurements of this difference. Blackwell Electronic Laboratories of Denver and the Department of Highways, State of Colorado, investigated this possibility during fiscal 1966-67. In the experiments, the dielectric constant of typical asphalt mixes was determined by measuring the change in capacitance of a parallel resonance circuit. The dielectric loss was determined by measuring the voltage of the resonance circuit. Frequencies used were from 500 to 200,000 cycles per second. A variety of combinations of capacitor plates and electrodes were used to obtain output values. After considerable work, it was tentatively concluded that the dielectric readings were as dependent upon the density of the mix as on the asphalt content. To measure asphalt content it will be necessary to control or measure the density of the sample. (BPR abstract)
Dielectric Measurements of Asphalt Content
1967
17 pages
Report
Keine Angabe
Englisch
Dielectric Measurements of Asphalt Content
NTIS | 1968
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