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Standards of highway conservation and maintenance are
improved gradually following the improvement of requirements of road service.
Before obvious damage such as obvious cracking (block，transverse, longitudinal ) and
rutting emerge, inconspicuous distress (micro-cracks, polishing, pockmarked) is
generated previously. These inconspicuous distresses may provide basis and
criteria for pavement preventive maintenance. Currently most of preventive
conservation measures are determined by experienced experts in maintenance and
repair of road after site visits. Thus method is difficult in operation, and
has a certain amount of instability as it is based on experience and personal
knowledge. In this paper, camera and laser were used for automated high-speed
acquisition images. Methods to preprocess pavement image are compared. The
pretreatment method suitable for analyze micro-cracks picture is elected, an effective
way to remove shadow is also proposed.
The diffusion of
potassium sorbate incorporated into gelatin based antimicrobial film was measured.
Fick’s second law was applied to investigate the mechanism of potassium sorbate
released from the films. The mathematical model was established. The result
showed that the diffusion coefficient D increased with the increase of potassium sorbate concentration. The effects of
temperature 5?C, 25?C and 35?C on diffusion were investigated. The mechanisms
of potassium sorbate diffusion through gelatin films were mainly Fickian and
determined by the power law model Mt/M∞ = k × tn. A
decrease in temperature from 35?C to 5?C resulted in a reduction of diffusion coefficients
from 5.20 × 10?12 to 1.36 × 10?12 m2/s. The diffusion coefficient of potassium sorbate is
influenced by receiving solution pH values.