THE CREEP TEST
In this review of the present state of the art regarding the creep test, theoretical aspects as well as technical aspects of the execution of the test are considered, while the relation with rutting tests in the laboratory and the application of the creep test as a method of usefully predicting the occurrence of rutting in actual practice receive due attention. The influence of various test parameters is examined, and recommendations for carrying out the creep test are given. Research carried out with a large number of different types of asphalt mix with widely varying stiffness moduli has shown that the reductions in thickness of the asphalt layers calculated on the basis of the creep test are in reasonably good agreement with the values measured in laboratory rutting tests and in practice. In general, however, the correlation becomes poorer (the correlation coefficient decreases) when a relatively small range of mix stiffnesses (e.g., varying within a factor of 5) is considered. All the same, there are clear indications that the results of the creep test and those of the rutting test within a relatively small range of stiffnesses, correlate well with one another for asphalt mixes with the same types of mineral aggregate when only the composition (quantities of the various components) is varied. This conclusion is of importance if the creep test is used for mix optimization, i.e., for the design of a mix given components with optimum resistance to permanent deformation. This provides an indication that the creep test may be a suitable method for supplementing and backing the Marshall test in asphalt mix design.
Study Centre for Road Construction, Netherlands14a Jansbuitensingel
- BOLK, HJNA
- Publication Date: 1981-2
- Features: Appendices; Figures; References; Tables;
- Pagination: 96 p.
- TRT Terms: Asphalt; Creep tests; Deformation; Forecasting; Laboratory tests; Marshall test; Mix design; Modulus; Pavements; Ruts (Pavements); Stiffness
- Uncontrolled Terms: Rut
- Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;
- Accession Number: 00334886
- Record Type: Publication
- Files: TRIS
- Created Date: Oct 28 1981 12:00AM