Statistical analysis of the asphalt mixtures volumetric properties |
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Authors: | Yiqiu Tan Huining Xu and AI-Hadidy Ai |
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Affiliation: | (1) Department of Civil Engineering, National Institute of Technology Karnataka, Mangalore, 575025, India;(2) Present address: Department of Civil Engineering, Dayananda Sagar College of Engineering, S.M.Hills, K.S.Layout, Bangalore, 560 078, India |
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Abstract: | Based on statistics principle, random error and systematic error were considered and the volumetric properties of the two
mixtures types, namely A and B, were statistically analyzed using different distribution methods. Seventy-two samples of mixture
A and fifty-two of mixture B were fabricated using the Marshall method. The probability distributions were compared on the
basis of goodness of fit. Weibull model was found to be most appropriate model for describing the asphalt mixtures volumetric
properties distribution. The two-parameter Weibull distribution function applied well to model the bulk specific gravity and
voids filled with asphalt data, whereas, the three-parameter Weibull distribution appeared to be more appropriate in the discussing
of air voids and voids in mineral aggregate. The experimetal results is revealed that compared with the mean value, the peak
value of Weibull distribution was suggested as an alternative and more powerful parameter for describing the test data distribution
characteristic. The analysis of test results also revealed that there were significant differences in the volumetric properties
of the two tested mixtures for the same confidence level. The confidence interval decreased with the decreasing in reliability. |
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