Abstract
Asphalt pavement subjected to heavy traffic load and harsh environmental conditions can easily build up damage and shorten the service life. In this paper, different dosages of basalt fiber (BF) were introduced into crumb rubber (CR) modified asphalt binder, and a series of laboratory tests were carried out to evaluate the properties and performances. A dynamic shear rheometer (DSR) was employed to evaluate viscosity and rheological properties. Bending beam rheometer (BBR) test and direct tensile test (DTT) were conducted to test the low temperature property. Cone penetration was designed to test shear strength. Results show that the optimum content of BF is 0.3% by the weight of asphalt binder based on the overall performance evaluation. Viscosity, complex modulus, fatigue property, rutting resistance, and shear strength are improved by introducing BF into asphalt binder. Stiffness and elasticity are also increased. BBR indicates that ductility at low temperature is reduced a little by the presence of BF, but DTT shows that both tensile strength and elongation are improved by BF. Considering that DTT is more performance related, DTT is preferred over BBR to evaluate cracking potentials at low temperatures of asphalt binder modified with CR and BF. Finally, it is revealed through microscale scanning that three mechanisms, absorption of asphalt binder, 3-dimensional fiber network, and bridging effects, contribute to the performance improvement of asphalt binder modified with CR and BF.
Highlights
With rapid development of human society and resultant fast growing of various kinds of wastes, the application of engineering waste to infrastructure has been gaining attention in both academic and engineering aspects [1, 2]. e use of crumb rubber to modify asphalt has a long history and continues to receive great attention
A lot of research has been dedicated to augment asphalt material property by adding crumb rubber (CR) or Basalt fiber (BF) separately, there are few studies on performance evaluation of asphalt material modified with both CR and BF
Asphalt binder with higher viscosity has better shear deformation resistance and better bond with aggregates. e viscosity was tested by dynamic shear rheometer (DSR) in Rotational Mode at rate of 10 rad/s, from 50°C to 175°C with increment of 2°C/min [33]
Summary
With rapid development of human society and resultant fast growing of various kinds of wastes, the application of engineering waste to infrastructure has been gaining attention in both academic and engineering aspects [1, 2]. e use of crumb rubber to modify asphalt has a long history and continues to receive great attention. E bending beam rheometer (BBR, Figure 3(a)) test exerts a three-point bending to an asphalt beam (Figure 3(b)) at temperature below zero to evaluate ductility of asphalt material at low temperature It provides a measurement of creep stiffness S and relaxation rate m-value of samples [35]. Direct tension test (DTT, Figure 4(a)) is a complementary test to evaluate low temperature cracking resistance when S in the BBR test is not satisfactory, especially for modified asphalt material [36, 37]. It pulls a dog bone shape specimen at a constant elongation rate (Figure 4(b)). The samples failed at DTT were scanned by environmental scanning electron microscope (SEM, Figure 6) to detect the state of BF in the CR-BF asphalt binder in microscale. e microscale image would help explain the mechanism of reinforcement of BF in the CR-BF asphalt binder
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