| Abstrakt: |
Since environmental factors at pavement construction sites are usually changed, the behavior of plastic shrinkage cracking, which is a common type of distress in concrete pavement, needs to be assessed to avoid deterioration and apply a more appropriate preventive method. This study evaluates the effects of different ambient temperature (30, 35, and 40 °C), relative humidity of the air (20, 45, and 70%), and wind speed (18, 24, and 30 km/h) on the characteristics of plastic shrinkage cracking distress in concrete pavement that are more practical in terms of inspection. These practical characteristics include temporal characteristics (time of balance of bleeding and evaporation, and time of the start of crackling) and geometric characteristics (mean cracking width, length of cracking, and area of cracking). They were examined in different environmental conditions according to ASTM C1579 standard test method, using an environmental simulator chamber and a digital monitoring approach consisted of digital image analysis. The results showed that practical characteristics are useful in denoting the behavior of plastic shrinkage cracking distress in concrete pavements in different environmental conditions. Each environmental factor has a different significant effect on the behavior of plastic shrinkage cracking distress. The time of balance was the most affected temporal characteristics, which shows higher sensitivity of the bleeding state of concrete pavement to environmental factors. Among geometric characteristics, the area of cracking was changed the most. Different environmental factors also had a more significant effect on the transverse changing of cracking than its longitudinal. The relative humidity had the most effects on the temporal and geometric characteristics, and the effects of temperature and wind speed were close to each other. A significant relationship was observed between the time of balance and the area of cracking, which indicates that the time of balance can be used effectively to predict cracking severity in different environmental conditions. |
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