Indirect tensile test as a simple method for rut resistance evaluation of asphalt mixtures – Polish experience / Piotr Zieliński // Road Materials and Pavement Design [Dokument elektroniczny]. – 2020, ... więcej

Indirect tensile test as a simple method for rut resistance evaluation of asphalt mixtures – Polish experience / Piotr Zieliński // Road Materials and Pavement Design [Dokument elektroniczny]. – 2020, Article in press, 17 s. : fot., tab., wykr. – Tryb dostępu: https://www.tandfonline.com/doi/full/10.1080/14680629.2020.1820894. – Bibliogr. s. 16-17, Abstr. – doi: 10.1080/14680629.2020.1820894. – ISSN 1468-0629

To assess the resistance of asphalt mixes to permanent deformations, thewheel tracking tests are frequently used, what requires specialized equip-ment as well as relatively large size samples. For this ... więcej

To assess the resistance of asphalt mixes to permanent deformations, thewheel tracking tests are frequently used, what requires specialized equip-ment as well as relatively large size samples. For this reason, researchersare seeking for a more simple test that will help to assess the rut resis-tance of asphalt mixes. According to Christensen and Bonaquist as wellas Zaniewski and Srinivasan, this may be the indirect tensile strength (ITS)test. Therefore, this research experimentally examined the relationship ofITS results on rutting parameters, i.e. proportional rut depth (PRDAIR) andwheel tracking speed (WTSAIR). The samples of asphalt concrete (AC), aswell as SMA and BBTM, were compacted with the Marshall hammer, butITS tests were conducted with a typical Marshall press, at a loading rate of50 mm/min. The test results indicated the need for separate analysis of con-tinuous type mixtures (AC) and gap-graded mixtures (SMA and BBTM). Therelationship of ITS results with rutting parameters depends on: the type ofmixture gradation (higher correlation coefficients were obtained for gap-graded mixtures) and ITS test temperatures (test results at 40°C achievedbettercorrelationsthanthoseobtainedat25°C).Usingtheregressionanaly-ses, the prediction limits as well as confidence limits were calculated, whichallowed to develop criteria for classifications of asphalt mixture resistanceto rutting categories, on the basis of ITS test.