Evolution and comprehensive evaluation of visco-elastic characteristics of road asphalt in medium temperature region

Pavement performance prediction after maintenance and rehabilitation is important to pavement management. A two-parameter exponential international roughness index (IRI) regression model for thin hot mix asphalt overlay was developed based on information from the U.S. Long Term Pavement Performance (LTPP) database. The model influence parameters α and β, which represent the initial IRI as the thin overlay completion and shape factor of IRI deterioration curve, were statistically analyzed. The results suggested that the IRI deterioration trends in high-temperature and low-temperature regions are different. This is because β was mainly affected by the structural strength and equivalent single axle loads in the high and medium temperature region and mainly affected by the average annual precipitation in low temperature region. In-situ data from LTPP database was used to verify the IRI prediction model, and it was found that the predicted IRI and measured IRI exhibited similar trends.

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Comprehensive evaluation of supercritical power cycle system using non-azeotropic mixtures driven by medium-temperature solar heat source

Journal of Renewable and Sustainable Energy ◽

10.1063/1.5047544 ◽

2018 ◽

Vol 10 (6) ◽

pp. 064706

Author(s):

Yujiong Gu ◽

Zhi Geng

Keyword(s):

Heat Source ◽

Comprehensive Evaluation ◽

Medium Temperature ◽

Solar Heat ◽

Power Cycle ◽

Cycle System ◽

Azeotropic Mixtures

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Research on Identification of Damage Development Mode of Rural Highway Asphalt Pavement Structure

Journal of Civil Engineering and Construction ◽

10.32732/jcec.2018.7.3.124 ◽

2018 ◽

Vol 7 (3) ◽

pp. 124

Author(s):

Mengdi Han ◽

Yihang Fu

Keyword(s):

Structural Damage ◽

Comprehensive Evaluation ◽

Asphalt Pavement ◽

Evaluation Model ◽

Fuzzy Comprehensive Evaluation ◽

Weight Vector ◽

Liaoning Province ◽

Damage Development ◽

Road Asphalt ◽

Damage Condition

According to the damage condition of asphalt pavement of rural roads in Liaoning Province, five development modes of asphalt pavement damage were proposed to determine the damage condition of asphalt pavement in the investigation section. The trapezoidal and semi-trapezoidal membership functions are used to construct the membership matrix, and the fuzzy comprehensive evaluation model is established, and the weight vector of each factor is determined. Finally, fuzzy mathematics is used to determine the stage of the general development period of the structural damage of the road segment. The research results have certain guiding significance for the management and maintenance of rural road asphalt pavement in Liaoning Province.

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