Abstract
The theory of grey relational grade was applied to calculate the relational grades between the maximum dry shrinkage strain and some evaluation indices of cracking resistance to dry shrinkage, and the relational grades between the maximum thermal shrinkage strain and some evaluation indices of cracking resistance to thermal shrinkage. The study results indicate that the relation between dry shrinkage energy anti-cracking coefficient and the maximum dry shrinkage strain and the relation between thermal shrinkage energy anti-cracking coefficient and the maximum thermal shrinkage strain of base materials are much better. This paper also draws a conclusion that it is more reasonable to evaluate the anti-cracking performance of semi-rigid base courses adopting dry shrinkage energy anti-cracking coefficient and thermal shrinkage energy anti-cracking coefficient. The conclusion has great direction on the design of bituminous pavements with semi-rigid base courses, and the results also indicate that grey relational analysis is a simple and effective method in the evaluation of anti-cracking performance of semi-rigid base course materials.
Highlights
Semi-rigid base course have been applied in high-grade highway widely in China because they have many advantages, such as high strength, better integrity, better water stability and so on
Grey relational analysis is the important content of grey system theory and it ascertains the difference and proximity among the series through the curve formed by the reference series and the compared series (Wang, 1987)
The maximum dry shrinkage strain and the maximum thermal shrinkage strain of semi-rigid base course materials are chosen as reference series to found two grey relational analysis models
Summary
Semi-rigid base course have been applied in high-grade highway widely in China because they have many advantages, such as high strength, better integrity, better water stability and so on. Some research has presented some methods to improve the anti-cracking performance of semi-rigid base course materials on the basis of the mechanism of cracking (Zhang, 1991, pp.). The research on how to evaluate the anti-cracking performance of semi-rigid base course materials reasonably is very rare. Used evaluation indices are dry shrinkage coefficient and thermal shrinkage coefficient, dry shrinkage anti-cracking coefficient (wet endurance coefficient) and thermal shrinkage anti-cracking coefficient (temperature endurance coefficient), dry shrinkage anti-cracking index (anti dry shrinkage endurance index) and thermal shrinkage anti-cracking index (anti thermal endurance index), dry shrinkage energy anti-cracking coefficient and thermal shrinkage energy anti-cracking coefficient (Yang, 2002, pp.13-15) Among these indices, there isn’t a certain answer about how to choose a more reasonable index. The more efficient evaluation indices of semi-rigid base course materials have been decided
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