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• W628104767 abstract "The objective of the project was to develop laboratory methods for testing resistance of asphalt mixture to freeze–thaw-cycles and the combine effect of water and loadings. Degree of water saturation of the asphalt specimen was chosen as a parameter for the indirect tensile strength test. If the voids volume is full of water, its degree of water saturation is 100 %. It was noted that if the degree saturation was 100 %, the water in the voids may reinforce the asphalt specimen during the momentary loadings e.g. in the indirect tensile strength test because water is incompressible. According to the European standard EN 12697-12 method B, water sensitivity testing has an inherent systematic error because in the indirect tensile strength test the degree of water saturation of wet specimens is too high and because the wet and dry specimens have totally different degrees of saturation. This systematic error apparently affects the water sensitivity test results of asphalt pavement, but its effect also depends on voids volume and voids shape of the pavement. However, the water sensitivity result is also affected by potential weakening of the adhesion between bitumen and aggregate during storage in water; Thus, the result of the water sensitivity test is affected by two simultaneous but divergent changes caused by water. The project proposed changes to the standard in order to eliminate the systematic error. At the same time of potentially changing the European standard method, the water sensitivity requirements should also be reviewed. On the basis of the project results, a method description for the freeze-thaw resistance of asphalt mixture (PANK-4306) was authored. According to the description, after 10 cycles of freeze-thaw test it will be made indirect tensile strength tests where the degree of saturation of the study specimens and reference specimens are equal but the pores are not full of water. The combined effect of water and loadings was studied in the laboratory using a device that subjected a water-saturated asphalt specimen in water immersion cyclic rapid short-term pressure impacts. The method simulated the pressure impacts caused by a lorry wheel on the top surface of asphalt pavement in late winter. Particular interest was drawn to the pressure impact test result according to which specimens that were during the loadings immersed in water and had pore volume full of water could withstand more rapid cyclic pressure impacts than dry specimens in air. The result was systematic in all pressure impact tests, at all of the temperatures studied (+5…+20 °C) and all asphalt surface pressures (1…7 MPa) used in the study. Actually in this test, the incompressibility of water in the pores of an asphalt specimen and the flow resistance of water in the pore volume substantially increased durability of a water-saturated asphalt structure during rapid momentary cyclic loadings. More information about the project in English is in the chapter: “8. Summary”." @default.
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• W628104767 date "2012-01-01" @default.
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• W628104767 title "Resistance of asphalt mixture to freeze - thaw-cycles and combined effect of water and loadings. Asfadur project. Final report" @default.
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