A Study on Anti-Cracking Performance of Lime and Fly-Ash Stabilized Coal Gangue Roadbase Materials

In order to determine the mix proportion with better anti-cracking performance of lime and fly-ash stabilized coal gangue roadbase materials, anti-cracking performance of lime and fly-ash stabilized coal gangue influenced by quality ratio of lime to fly-ash was studied based on the same aggregate gradation and the same aggregate ratio. And then crack of test road with different mix proportion was observed. Results show that both temperature shrinkage anti-cracking coefficient and drying shrinkage anti-cracking coefficient vary along parabola rule with the decrease of the quality ratio of lime to fly-ash. The mixture have the best anti-cracking performance when the quality ratio of lime to fly-ash is 5:15, which was test and verify in the transverse crack observations of test road. Lime and fly-ash stabilized coal gangue roadbase materials have a good anti-cracking performance and suitable for base in the pavement structure. The reasonable ratio of lime and fly-ash stabilized coal gangue roadbase materials in the engineering should be 5:15:80.