BS EN 12697-26 is part of the multi-series documents that are applicable to bituminous mixtures. BS EN 12697-26 specifies the methods for characterizing the stiffness of bituminous mixtures by alternative tests, including bending tests and direct and indirect tensile tests. The tests are performed on compacted bituminous material under sinusoidal loading or other controlled loadings, using several types of specimens and supports.
The procedure is used to rank bituminous mixtures based on stiffness, as a guide to relative performance in the pavement, to obtain data for estimating the structural behaviour in the road, and to judge test data according to specifications for bituminous mixtures.
For the choice of specific test conditions, the requirements of the product standards for bituminous mixtures should be respected.
Note1: BS EN 12697-26 does not impose a particular type of testing device the precise choice of the test conditions depends on the operating scope and working range of the device used.
Note2: The applicability of BS EN 12697-26 is described in the product standards for bituminous mixtures.
BS EN 12697-26 on the characterizing the stiffness of bituminous mixtures is useful for:
Characterizing the stiffness of bituminous mixtures is fundamental to the analysis of the stress-strain response of pavement under traffic loading.
BS EN 12697-26 specifies the methods for characterizing the stiffness of bituminous mixtures by alternative tests, including bending tests and direct and indirect tensile tests.
BS EN 12697-26 is used to rank bituminous mixtures based on stiffness, as a guide to relative performance in the pavement and to obtain data for estimating the structural behaviour in the road.
BS EN 12697-26:2018 supersedes BS EN 12697-26:2012, which is withdrawn.
BS EN 12697-26:2018 includes some technical changes with respect to BS EN 12697-26:2012. These include:
EN 12697-26:2018