Abstract
There are many parameters that could affect the properties of asphalt mixtures, such as the fiber additive, gradation type, nominal maximum aggregate size (NMAS), and asphalt. To evaluate the influence of these factors on the crack resistance of asphalt mixture, 10 different types of asphalt mixtures were prepared. The indirect tensile asphalt cracking test (IDEAL-CT) and semi-circle bending test (SCB) were adopted to test the anti-cracking ability of the test samples. The parameters of these two test results were also used to conduct the correlation analysis to find the correlation between different parameters, and scanning electron microscope (SEM) test was also used to analyze the micro cracks of asphalt mixture. The results showed that basalt fiber could further enhance the anti-cracking ability of asphalt mixture. Stone matrix asphalt (SMA) showed better anti-cracking performance than Superpave (SUP) asphalt mixtures. The increase in the nominal maximum aggregate size could decrease the anti-cracking ability of asphalt mixtures. Styrene-Butadiene-Styrene (SBS) modified asphalt could better reinforce the anti-cracking ability than pure asphalt. The CTindex of IDEAL-CT test and Flexibility index (FI) value of SCB test results showed better correlation. This paper has certain significance in guiding the design of asphalt mixtures having good crack resistance.
Highlights
The rising of the traffic volume and the traffic load, etc., are making the asphalt pavement suffer from various distresses such as cracking, raveling, and rutting [4,5,6], etc
With the aim to find the impact of the gradations on the anti-crack ability of asphalt mixtures, two different asphalt mixtures (SMA-13 and SUP-13) without basalt fiber and with the same content of basalt fiber were used to study the effect of gradation type on the cracking resistance of asphalt mixtures
IDEAL cracking test results and standard deviation are shown in Figures 6 and 7
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. It helps to bond the aggregates together and helps to transfer stress inside the asphalt mixtures These are the reasons why this paper chose to study the effect of these factors on the anti-cracking ability of asphalt mixtures. With the aim to find the impact of the gradations on the anti-crack ability of asphalt mixtures, two different asphalt mixtures (SMA-13 and SUP-13) without basalt fiber and with the same content of basalt fiber were used to study the effect of gradation type on the cracking resistance of asphalt mixtures. SUP-20 mixtures and basalt fiber reinforced SUP-20 mixtures using SBS modified asphalt and pure asphalt were used to study the effect of asphalt type on the cracking resistance.
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