scholarly journals Performance evaluation and viscoelastic model establishment of recycled hot mix asphalt

2020 ◽  
Vol 165 ◽  
pp. 04054
Author(s):  
Yanhai Yang ◽  
Xitai Yan ◽  
Ye Yang ◽  
Hong Cui
Keyword(s):  
Hot Mix Asphalt ◽  
Viscoelastic Model ◽  
Maxwell Model ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Recycled Asphalt ◽  
The Road ◽  
Splitting Test ◽  
Different Temperatures ◽  
Dynamic Modulus Test

In this paper, the pavement performance of recycled hot mix asphalt with 30% recycled asphalt pavement (RAP) content is studied by mix design, splitting test, freeze-thaw splitting test and dynamic modulus test. The results show that the recycled hot mix asphalt with 30% RAP content has better high-temperature deformation resistance than hot mix asphalt, but low temperature performance is slightly worse, and the water stability is not much different. It is proved that the road performance of recycled hot mix asphalt with 30% RAP content is the same as that of hot mix asphalt. Recycled hot mix asphalt with 30% RAP content can be widely used. The flexural creep test data at different temperatures were fitted to the exponential decay function, which proved that the recycled hot mix asphalt conformed to the generalized Maxwell model, and provided parameters for the establishment and analysis of the viscoelastic mechanical model of the recycled hot mix asphalt.

scholarly journals Study on Relaxation Damage Properties of High Viscosity Asphalt Sand under Uniaxial Compression

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Yazhen Sun ◽  
Zhangyi Gu ◽  
Jinchang Wang ◽  
Chenze Fang ◽  
Xuezhong Yuan
Keyword(s):  
Uniaxial Compression ◽  
Viscoelastic Model ◽  
Relaxation Modulus ◽  
Maxwell Model ◽  
High Viscosity ◽  
Secondary Development ◽  
Compression Tests ◽  
Crack Control ◽  
Different Temperatures ◽  
Damage Process

Laboratory investigations of relaxation damage properties of high viscosity asphalt sand (HVAS) by uniaxial compression tests and modified generalized Maxwell model (GMM) to simulate viscoelastic characteristics coupling damage were carried out. A series of uniaxial compression relaxation tests were performed on HVAS specimens at different temperatures, loading rates, and constant levels of input strain. The results of the tests show that the peak point of relaxation modulus is highly influenced by the loading rate in the first half of an L-shaped curve, while the relaxation modulus is almost constant in the second half of the curve. It is suggested that for the HVAS relaxation tests, the temperature should be no less than −15°C. The GMM is used to determine the viscoelastic responses, the Weibull distribution function is used to characterize the damage of the HVAS and its evolution, and the modified GMM is a coupling of the two models. In this paper, the modified GMM is implemented through a secondary development with the USDFLD subroutine to analyze the relaxation damage process and improve the linear viscoelastic model in ABAQUS. Results show that the numerical method of coupling damage provides a better approximation of the test curve over almost the whole range. The results also show that the USDFLD subroutine can effectively predict the relaxation damage process of HVAS and can provide a theoretical support for crack control of asphalt pavements.

scholarly journals Suitability of Fiber Lengths for Hot Mix Asphalt with Different Nominal Maximum Aggregate Size: A Pilot Experimental Investigation

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3685 ◽  
Author(s):  
Keke Lou ◽  
Peng Xiao ◽  
Aihong Kang ◽  
Zhengguang Wu ◽  
Pengcheng Lu
Keyword(s):  
Low Temperature ◽  
Crack Resistance ◽  
Fiber Length ◽  
Hot Mix Asphalt ◽  
Basalt Fiber ◽  
Aggregate Size ◽  
Temperature Deformation ◽  
Maximum Aggregate Size ◽  
Fiber Reinforced ◽  
Splitting Test

Fiber length is a key parameter for the mixture design of basalt fiber-reinforced hot mix asphalt (HMA), which significantly affects the mix performance. To evaluate the suitability of fiber lengths for HMA with different nominal maximum aggregate size (NMAS), basalt fiber with the lengths of 3, 6, 9, 12, and 15 mm were selected for dense graded gradations with different NMASs (namely, SUP-13, SUP-20, and SUP-25), so as to prepare the fiber-reinforced HMA mixtures. Then, the mix performance was evaluated by an indirect tensile asphalt cracking test (IDEAL-CT), a four-point bending beam fatigue test, a wheel tracking test, a uniaxial penetration test, a low temperature bending beam test, and a freeze-thaw splitting test. Based on the performance results, the optimum fiber length for each mix gradation was proposed by the normalization method. The results showed that adding basalt fiber can enhance the comprehensive performance of all three types of HMA to a great extent. Furthermore, fiber length presented remarkable impact on the crack resistance, the fatigue resistance of the HMA, and the low temperature crack resistance, but it had limited influence on the high temperature deformation resistance, and water stability. The optimum fiber length for SUP-13, SUP-20, and SUP-25 was 6, 9, and 12 mm, respectively.

scholarly journals Study on the High-Temperature Deformation and Dynamic Recrystallization Behavior near the Interface of Stainless Steel Cladding

Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 81
Author(s):  
Meirong Shuai ◽  
Binbin Chang ◽  
Min Zhang ◽  
Zhibing Chu ◽  
Haibin Li ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Building Materials ◽  
Electron Backscatter Diffraction ◽  
Positive Impact ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Different Temperatures ◽  
Dynamic Recrystallization Behavior ◽  
Backscatter Diffraction

To ensure the long service life of concrete buildings in the marine environment, it is urgent to develop building materials with good corrosion resistance and weatherability. Stainless steel cladding is suitable for a highly corrosive environment and provides cost advantages. This paper investigated the deformation coordination and the microstructure evolution near the cladding interface of stainless steel/carbon steel. The stress-strain curves at different temperatures and strain rates were analyzed on the basis of high-temperature compression experiments. In addition, the sin-hyperbolic constitutive model was constructed, and the optimized parameters were obtained using electron backscatter diffraction characterization technology. The results show that at the deformation temperature of 1100 °C and the strain rate of 1 s−1, the deformation coordination increases significantly near the interface, accompanied by a large number of recrystallized grains, which has a positive impact on the comprehensive performance of the materials.

scholarly journals The Influence of a Field-Aged Asphalt Binder and Aggregates on the Skid Resistance of Recycled Hot Mix Asphalt

2021 ◽  
Vol 13 (19) ◽  
pp. 10938
Author(s):  
Nathanyawat Sedthayutthaphong ◽  
Peerapong Jitsangiam ◽  
Hamid Nikraz ◽  
Suriyavut Pra-ai ◽  
Sarintip Tantanee ◽  
...  
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Binder ◽  
Frictional Resistance ◽  
Road Surface ◽  
Skid Resistance ◽  
Recycled Asphalt ◽  
Reclaimed Asphalt ◽  
The Road ◽  
Road Pavement ◽  
Aged Asphalt

The application of asphalt hot mix recycling is one challenge in sustainable road pavement research. In addition to the vast amount of research on the performance of recycled asphalt–concrete, the research on the frictional resistance of recycled hot mix asphalt is still limited. The effects of aged asphalt and aged aggregates on the skid resistance of recycled hot mix asphalt were investigated in this research. The aged asphalt and aged aggregates were carefully extracted from the field-reclaimed asphalt pavement, and the engineering and mechanical properties of aged and virgin aggregates were measured. The degradation of recycled hot mix asphalt was simulated using an accelerated polishing machine to mimic road surface abrasion. Accordingly, the initial and final skid resistances of the recycled hot mix asphalt were determined and correlated with the properties of the aged asphalt and aggregates. The initial skid resistance of recycled hot mix asphalt decreased with reductions in penetration and ductility of the blended asphalt. However, the changes in the blended asphalt properties contributed only small variations to the final skid resistances of the recycled hot mix asphalt. The gradations of recycled hot mix asphalt correlated only with the final skid resistances. The aggregate gradations controlled the characteristics of the final skid resistance since the covered binder was partially polished off from the road surface at this stage.

Effect of Additives on High Temperature Deformation in Cubic Zirconia (Y-CSZ)

2008 ◽  
Vol 57 (6) ◽  
pp. 543-547
Author(s):  
Takuma WADA ◽  
Takahiro KAKEI ◽  
Hiroyuki HORII ◽  
Takeshi SHIONO ◽  
Yasunori OKAMOTO
Keyword(s):  
High Temperature ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Cubic Zirconia ◽  
Effect Of Additives

scholarly journals Hot Compression Behavior of New Al-6Mg and Al-8Mg Alloy with Improved Hot Workability Fabricated by Direct Chill Casting Method

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 288
Author(s):  
Nam-Seok Kim ◽  
Kweon-Hoon Choi ◽  
Seung-Yoon Yang ◽  
Seong-Ho Ha ◽  
Young-Ok Yoon ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Compression Test ◽  
Deformation Behavior ◽  
Hot Compression ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Strength Increase ◽  
Peak Strain ◽  
Hot Workability ◽  
Hot Compression Test

A hot compression test of new Al-6Mg and Al-8Mg alloys was conducted to understand the dynamic recrystallization (DRX) behavior by Mg contents. To investigate the hot workability of Al-Mg with high Mg contents, the hot deformation behavior of Al-6Mg and Al-8Mg alloys was analyzed by a hot compression test in the temperature range of 300–450 °C, and the strain rate range of 10−3–100/s. Subsequently, high-temperature deformation behavior was investigated through the processing map and microstructure observation. In this study, the results have shown that, as the Mg contents increase, the maximum and yield strength increase while rapid flow softening after the peak strain has been observed due to accelerated dynamic recrystallization (DRX). Finally, the increase of Mg contents affects an increase of heat dissipation efficiency to be an indicator of regular deformation.

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