scholarly journals Correction: Xia, C.; et al. Unified Strength Model of Asphalt Mixture under Various Loading Modes. Materials 2019, 12, 889

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5393
Author(s):  
Chengdong Xia ◽  
Songtao Lv ◽  
Lingyun You ◽  
Dong Chen ◽  
Yipeng Li ◽  
...  
Keyword(s):  
Asphalt Mixture ◽  
Strength Model ◽  
Loading Modes

The authors wish to make the following correction to this paper [...]

scholarly journals Unified Strength Model of Asphalt Mixture under Various Loading Modes

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 889 ◽  
Author(s):  
Chengdong Xia ◽  
Songtao Lv ◽  
Lingyun You ◽  
Dong Chen ◽  
Yipeng Li ◽  
...  
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Structure Design ◽  
Strength Model ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Direct Tension ◽  
Indirect Tension ◽  
Pavement Structure ◽  
Loading Modes

Although the rutting resistance, fatigue cracking, and the resistance to water and frost are important for the asphalt pavement, the strength of asphalt mixture is also an important factor for the asphalt mixture design. The strength of asphalt mixture is directly associated with the overall performance of asphalt mixture. As a top layer material of asphalt pavement, the strength of asphalt mixture plays an indispensable role in the top structural bearing layer. In the present design system, the strength of asphalt pavement is usually achieved via the laboratory tests. The stress states are usually different for the different laboratory approaches. Even at the same stress level, the laboratory strengths of asphalt mixture obtained are significantly different, which leads to misunderstanding of the asphalt mixtures used in asphalt pavement structure design. The arbitrariness of strength determinations affects the effectiveness of the asphalt pavement structure design in civil engineering. Therefore, in order to overcome the design deviation caused by the randomness of the laboratory strength of asphalt mixtures, in this study, the direct tension, indirect tension, and unconfined compression tests were implemented on the specimens under different loading rates. The strength model of asphalt mixture under different loading modes was established. The relationship between the strength ratio and loading rate of direct tension, indirect tension, and unconfined compression tests was adopted separately. Then, one unified strength model of asphalt mixture with different loading modes was established. The preliminary results show that the proposed unified strength model could be applied to improve the accurate degree of laboratory strength. The effectiveness of laboratory-based asphalt pavement structure design can therefore be promoted.

Development of a multi-modal overlay tester for the evaluation of asphalt overlay cracking behaviors

2020 ◽  
Vol 47 (11) ◽  
pp. 1258-1266 ◽  
Author(s):  
Christopher Jabonero ◽  
Jin-Whoy Park ◽  
SungWoo Ryu ◽  
Wuguang Lin ◽  
Yoon-ho Cho
Keyword(s):  
Lateral Displacement ◽  
Asphalt Mixture ◽  
Single Mode ◽  
Critical Issue ◽  
Mode I ◽  
Traffic Loading ◽  
Reflection Cracking ◽  
Asphalt Overlay ◽  
Loading Modes ◽  
Overlay Tester

Reflection cracking is a critical issue in asphalt overlay pavement. Temperature variation and traffic loading are the main fracture modes acting on the material. In this paper, a multi-modal overlay tester is proposed for the evaluation of the reflection cracking resistance of an asphalt mixture, an approach that simulates three loading modes on asphalt specimens. A fine dense-grade hot mix asphalt is used as the test specimen and subjected to different loading conditions such as single Mode I, II, and III loading simulations and combined I+II and I+II+III loading simulations. Results show coefficients of variation (CVs) of 2.5%, 10.3%, and 7.4% for the Mode I, II, and III loading simulations, respectively. Furthermore, the β coefficient, with a CV of 7%, is used to represent the crack resistance of the asphalt mixture. Finally, the crack propagation occurs rapidly when subjected to tension and lateral displacement prior to repeated traffic loading simulations.

Relating Field Moduli of Asphalt Mixture Layer Under Vehicular Loading and its Dynamic Moduli Under Laboratory Loading

2021 ◽  
pp. 036119812110444
Author(s):  
Huailei Cheng ◽  
Lijun Sun ◽  
Ruikang Yang ◽  
Yining Zhang ◽  
Liping Liu
Keyword(s):  
Input Parameter ◽  
Asphalt Mixture ◽  
Loading Mode ◽  
Four Point Bending ◽  
Wide Range ◽  
Modification Factor ◽  
Essential Input ◽  
Indirect Tensile ◽  
Loading Modes ◽  
The Relationship

The modulus of the asphalt layer is an essential input parameter in asphalt pavement design. For design purposes, the relationship between field and laboratory moduli of the asphalt mixture layer needs to be identified. In this research, the field modulus of the asphalt layer is predicted via a developed field modulus master curve. The laboratory modulus of asphalt mixture is measured using three different loading modes, namely uniaxial compressive (UC), indirect tensile (IDT), and four-point bending (4PB) modes. The loading mode is observed to affect the mixture’s laboratory modulus. The asphalt mixture moduli measured from UC mode are generally the highest, following by those from IDT mode, whereas the 4PB mode generates the lowest asphalt mixture moduli. By comparing field and laboratory moduli of asphalt mixture, it is found that the laboratory modulus from 4PB mode yields satisfactory predictions for the mixture’s field modulus in a wide range of loading frequencies. The UC and IDT modes, which tend to overpredict the field modulus of the asphalt layer, need to be modified. The modification factor ranges between 0.3 and 0.7 for UC mode, and varies from 0.2 to 1.0 for IDT mode. For both modes, the modification factors grow closer to 1.0 with increasing frequencies and decreasing temperatures, implying that UC and IDT modes become increasingly suitable for simulating field conditions at high frequencies and low temperatures.

scholarly journals A Unified Strength Model of Asphalt Mixture Considering Temperature Effect

2021 ◽  
Vol 8 ◽  
Author(s):  
Guoping Qian ◽  
Hui Yang ◽  
Xi Li ◽  
Huanan Yu ◽  
Xiangbing Gong ◽  
...  
Keyword(s):  
Asphalt Mixture ◽  
Tensile Tests ◽  
Strength Characteristics ◽  
Effect Of Temperature ◽  
Engineering Practice ◽  
Strength Model ◽  
Compression Tests ◽  
Shear Property ◽  
Different Temperatures ◽  
Direct Tensile

The strength characteristics of asphalt mixture is crucial for the design and construction of asphalt roads. A strength model considering the effect of temperature is presented in this paper based on unified strength theory (UST). Firstly, direct tensile tests, uniaxial compression tests and anti-shear property tests of asphalt mixture were carried out respectively at different temperatures. Key mechanical parameters were obtained, including tensile strength (σt), compressive strength (σc) and shear strength (τ0) at different temperatures. Besides, the temperature sensitivity of σt, σc and τ0 was systematically analyzed. The results showed that the UST parameters of tensile-compression strength ratio α and failure criterion parameter b have a linear relationship with temperature t. A theoretical model to describe strength characteristics with the temperature of asphalt mixture was developed finally. The developed model was validated via applicability analysis. and it will provide theoretical support for the study of strength characteristics of asphalt mixture and engineering practice.

Sign in / Sign up

Export Citation Format

Share Document