Study On The Property Of Lime-Fly-Ash Bound Macadam Strengthened With Fibre

The bituminous pavement with semi-rigidity base made of lime-fly-ash bound macadam has been widely used in highway construction in China. But, cracks often occur in the lime-fly-ash bound macadam base due to the dry-shrinkage and the temperature-shrinkage. As a result, the applicable properties of the semi-rigidity bituminous pavement may be weakened. At present, there are measures to reduce the shrinkage of the lime-fly-ash bound macadam and to increase the split strength. However, seldom of them are effective. In this research, the lime-fly-ash bound macadam was joined with steel fibers, glass fibers and polypropylene fibers with the contents of the lime, the fly ash and the macadam fixed in lab tests. The study focuses mainly on the split strength, compression strength, and modulus of compressive resilience and shrinkage property of the lime-fly-ash bound macadam enhanced by different kinds of fibers. Based on the test, a detail theoretical analysis was made on the relation of mechanical property, dry shrinkage with the variety and the quantity of fibers, applying the theories of strength, dry shrinkage and the methods of statistics, curve mimesis and variance analysis. At last, the conclusion was driven that the fiber has much influence on the mechanic property, dry shrinkage and the modulus of compressive of the lime-fly-ash bound macadam. In addition, relevant advices are proposed, which will provide some theoretical value and direction to the study and application of the lime-fly-ash bound macadam.