und es gibt eine Reihe von Argumenten dafur, daB das zweckmanig ist -, so folgt mit (1) 2. f. Werkstofftechnik I J . of Materials Technology 2. Jahrg. 1971 I Nr. 3
It is possible to disturb the equilibrium velocity distribution of molecules in a gas by absorption of narrow band laser light. This leads to light induced transport phenomena. We report on experiments, where we have measured the pressure difference caused by light induced viscous flow and where we have separated the two nuclear spin modifications of CH3F with the help of light induced drift.
The first part of this article, published in last month's issue, dealt with the general concept and economic importance of corrosion. The authors then commenced a description of an investigation to determine the corrosion behaviour of zinc and cadmium coatings under the action of pure moisture produced by condensation. A discussion of the experimental results is now given in this concluding part. All tables referred to were published in Part 1.
The highly plastic and viscoplastic behavior of asphalt at high service temperatures possibly leads to irreversible deformations in form of rutting which significantly influence road safety. Therefore the deformation resistance is one of the most important usage properties of asphalt. To quantify the deformation resistance, besides wheel tracking, the uniaxial cyclic compression test as a special case of the triaxial cyclic compression test without lateral confinement is used in Germany. Thereby cylindrical asphalt specimens are exposed to a sinusoidal pulsed-shaped cyclic compression load with rest periods for 10.000 load cycles. The specimens may be fabricated by impact compactor, roller compactor or may be drilled out of asphalt pavement. As decisive parameter the strain rate at the inflection point of the pulse creep curve is to be determined. If the inflection point is not reached during the test the local tangent between the last 1.000 load cycles is considered the strain rate. The deformation resistance is mostly influenced by asphalt composition (kind of binder, binder content, granulometry), volumetric parameters as the density and the compression ratio as well as the kind of compression. Within the project FE 07.0253/2011/ERB it was possible to quantify and qualify these influences for different pavement layers of 21 test sections. Thereby precious know-how with cyclic compression test was gained which will lead to a more detailed description of deformation properties of asphalt.
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