Ref[1] https://doi.org/10.1016/j.conbuildmat.2007.07.014
Moisture damage has been one of the major concerns for hot mix asphalt (HMA) pavements.
The moisture induced stress tester (MIST) was developed to simulate the conditions of repeated generation of pore pressure in a saturated pavement under traffic load. The MIST consists of a system to use a supply of compressed air to load and apply vacuum to force water out and in (respectively) through a HMA sample, which is kept in water maintained at a constant temperature. In this study, the water temperature was 40 °C, and the air pressure was 40 psi (0.28 MPa). The specimens for the dynamic modulus test were conducted after 500 or 1000 cycles of MIST conditioning, and the specimens for Superpave IDT tests were conducted 500 cycles. Photos of the equipment are shown in Fig. 2.
trial pavement sections--试验路段。。
Ref[2] https://doi.org/10.1016/j.conbuildmat.2018.03.171
Evaporation-induced moisture damage of asphalt mixtures: Microscale model and laboratory validation
In 2005, an additional cost of 54 billion dollars was imposed to highway agencies in United States in order to maintain highways due to moisture damage [1].
The moisture damage mechanism is comprised of two stages: 1) a moisture diffusion process; and 2) a mixture mechanical response.
Environmental conditions significantly influence the moisture diffusion process. For instance, high relative moisture, intensive rainfalls, freeze/thaw cycles, and other environmental conditions increase the exposure of materials to moisture, elevating moisture damage potential.
Ref[3] https://doi.org/10.1016/j.conbuildmat.2019.08.039
3D reconstruction of moisture damage resulted volumetric changes in porous asphalt mixture
Distinctly volumetric changes were detected by CT and 3D reconstruction.