An Interval Parameter Calculation Method of Asphalt Pavement Structure Design Based on Point Numerical Algorithm

In the asphalt pavement structure design method, the structural analysis and design are generally performed in the form of point values. However, determining the point value form of design parameters based on the statistical analysis theory cannot fully reflect the complex properties such as variability and uncertainty of parameters. In order to further improve the reliability and practicability of pavement design parameters, in this article, we have introduced the interval number representation that can better reflect the complex nature of parameters; but the interval number algorithm is too complicated and common calculation tools and software are difficult to adopt, which limit the wide application of interval analysis to some extent. The article analyzes the algorithm of interval numbers, focusing on the analysis of interval numbers of unary and binary functions. In this way, the point number operation can be used to obtain the interval number result of the function consistent with the interval number algorithm, which avoids the complicated interval number operation process and the interval expansion. The point numerical function algorithm of interval numbers is verified by design parameters and the calculation of asphalt pavement structure such as axle load conversion, cumulative equivalent axis calculation, calculation of foundation layer tensile stress of each structure layer, calculation of mixture penetration strength, fatigue cracking check of asphalt mixture layer, permanent deformation check, and vertical pressure strain test of roadbed top surface. In conclusion, this research provides a simple and easy way to implement the application of mathematical tools for interval analysis, which is suitable for direct use for existing point numerical calculation tools and software.

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Study on Differences of Design Parameters between Chinese and French Asphalt Pavement Structure Design

CICTP 2020 ◽

10.1061/9780784483053.096 ◽

2020 ◽

Author(s):

Lei Yin ◽

Aiqin Shen ◽

Chao Yao

Keyword(s):

Asphalt Pavement ◽

Structure Design ◽

Design Parameters ◽

Pavement Structure

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Unified Strength Model of Asphalt Mixture under Various Loading Modes

Materials ◽

10.3390/ma12060889 ◽

2019 ◽

Vol 12 (6) ◽

pp. 889 ◽

Cited By ~ 4

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.

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Sponge roads: the permeable asphalt pavement structures based on rainfall characteristics in central plains urban agglomeration of China

Water Science & Technology ◽

10.2166/wst.2019.426 ◽

2019 ◽

Vol 80 (9) ◽

pp. 1740-1750 ◽

Cited By ~ 2

Author(s):

Xiaodong Guo ◽

Jiupeng Zhang ◽

Bochao Zhou ◽

Wolong Liu ◽

Jianzhong Pei ◽

...

Keyword(s):

Surface Layer ◽

Bearing Capacity ◽

Asphalt Pavement ◽

Structure Design ◽

Urban Agglomeration ◽

Central Plains ◽

Rainfall Characteristics ◽

Combination Scheme ◽

Pavement Structure ◽

Pavement Structures

Abstract Permeable asphalt pavement should be selected according to the rainfall characteristics of the project site, so as to improve the permeable performance and ensure the bearing capacity of the pavement structure. Therefore, taking a city in the central plains urban agglomeration of China as an example, the characteristics of the rainstorm intensity distribution and cumulative rainfall are analyzed, and a combination scheme of drainage surface layer asphalt pavement suitable for rainfall characteristics in this area is proposed. Then, the pavement structure design is systematically carried out based on the permeable capacity and bearing capacity. The results show that under the rainfall conditions in this area, there is no surface runoff on the permeable asphalt pavement with 120 mm drainage surface layer, which is suitable for the medium traffic grade of urban roads with cumulative equivalent axle loads of 10 million to 12 million times.

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Temperature Adaptability of Asphalt Pavement to High Temperatures and Significant Temperature Differences

Advances in Materials Science and Engineering ◽

10.1155/2018/9436321 ◽

2018 ◽

Vol 2018 ◽

pp. 1-16

Author(s):

Xueying Zhao ◽

Aiqin Shen ◽

Baofu Ma

Keyword(s):

Asphalt Pavement ◽

Maximum Shear Stress ◽

Structure Design ◽

Temperature Fields ◽

Asphalt Pavements ◽

Fe Model ◽

Tire Pressure ◽

Significant Temperature ◽

Pavement Structure ◽

Temperature Adaptability

Temperature adaptability of asphalt pavements is very important, due to their potential influence on pavement structure design, particularly in areas that experience significant temperature differences. In this paper, a finite element (FE) model was developed, and Turpan-Xiaocao Lake Highway in southern Xinjiang was taken as a case study engineering, which tends to experience this adverse environmental condition (temperature difference: 25.5°C; July 14, 2008). In this model, the generalized Kelvin model and the Burgers model were used. The time-dependent tire pressure was considered. To guide pavement structure design and control pavement distresses in this area, seven alternative pavement structures were selected to simulate and analyze pavement temperature fields and the mechanical responses. It was observed that the influence of air temperature had the greatest impact on Str-1, possibly due to the thinnest asphalt course. Moreover, when rutting depth, maximum shear stress of the asphalt course, deflection on the pavement surface, and compressive strains at the subgrade top surface were taken as the evaluation indices, the adaptability of asphalt pavements using compound base courses had obvious advantage due to their strong absorption and reflection of load impact. The adaptability of seven structures analyzed in this paper decreased in the following order: Str-5 > Str-6 > Str-4 > Str-2 > Str-m > Str-1 > Str-3. In addition, it broke the traditional view that asphalt pavement with a flexible base had the poor ability on rutting resistance. Besides, it also suggests that when the thickness of asphalt courses was equivalent, increasing the thickness of chemical-treated base courses would help with the deformation resistance, and vice versa.

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Mechanical Response and Structure Optimization of Nanomodified Asphalt Pavement

Advances in Civil Engineering ◽

10.1155/2021/6286704 ◽

2021 ◽

Vol 2021 ◽

pp. 1-13

Author(s):

Wenjun Gu ◽

Yao Tian ◽

Xuanyu Zhang

Keyword(s):

Mechanical Response ◽

Mechanical Performance ◽

Asphalt Pavement ◽

Structural Models ◽

Structure Optimization ◽

Design Parameters ◽

Modified Asphalt ◽

Unique Material ◽

Pavement Structure ◽

Pavement Thickness

Nanomaterials are widely used in the preparation of modified asphalt because they can improve the high-temperature performance of matrix asphalt and have achieved good engineering results. However, the existing research mainly focuses on the material analysis and formula development of nanomodified asphalt and has not yet been involved in the mechanical response of the nanomodified asphalt pavement structure. The mechanical response contains the horizontal tensile stress and the vertical compressive stress of SiO2 modified asphalt pavement. It is unable to propose the matching pavement structure combination for the unique material characteristics of nanomodified asphalt, which leads to the increase of the possibility of pavement diseases and material waste. Hence, considering that semirigid base is the most widely used base type in China, two different structural models of nanomodified asphalt pavement are established according to the current specifications. The effects of pavement thickness, material type, and pavement design parameters on the mechanical response of nanomodified asphalt pavement are analyzed, and then the principle of optimal mechanical performance is taken and the optimal combination of nanomodified asphalt pavement structure is proposed.

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AC-25 Asphalt Mixture Dynamic Stability Criteria

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.718-720.1855 ◽

2013 ◽

Vol 718-720 ◽

pp. 1855-1860

Author(s):

Chuang Min Li ◽

An Liu ◽

Yun Chen

Keyword(s):

Dynamic Stability ◽

Asphalt Pavement ◽

Asphalt Mixture ◽

Structure Design ◽

Specimen Thickness ◽

Stability Criteria ◽

High Temperature Stability ◽

Highway Engineering ◽

Technical Specifications ◽

Pavement Structure

With the publication of Standard test methods of bitumen and bituminous mixtures for highway engineering " in 2011, the common asphalt mixture rutting test can be carried out in accordance with the T0719-2011 in China. But in our country, the current " Technical specifications for construction of highway engineering asphalt pavement " published in 2004 describes that the nominal maximum size of more than 19mm dense-graded asphalt concrete or asphalt treated permeable base is not suitable for carrying out specimens rutting test in accordance with the size of 300mm× 300mm ×50mm, so there is no corresponding dynamic stability requirements to the commonly used AC-25 type asphalt mixture in pavement layer in China. Combined with the Dao-He expressway pavement structure design and used the T0719-2011 method of AC-25 type different thickness rutting test, the relationship between the rutting specimen thickness and the dynamic stability is established. With reference to the requirements of asphalt pavement construction specifications and pavement structure layer on high temperature stability, the 8cm thick AC-25 common asphalt mixture dynamic stability criteria is put forward. Analyzing on AC-25 with No. 50 pure asphalt mixture dynamic stability test data, the dynamic stability requirements is put forward as validation for AC-25 asphalt mixture dynamic stability criteria in Dao-He expressway.

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Reliability Analysis of Asphalt Pavement Structure Based on Three-Dimensional Finite Element

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.255-260.3421 ◽

2011 ◽

Vol 255-260 ◽

pp. 3421-3425

Author(s):

Shi Bin Ma ◽

Kai Wang ◽

Yang Feng Wu ◽

Lian Yu Wei ◽

Ming Wei Zhang

Keyword(s):

Reliability Analysis ◽

Asphalt Pavement ◽

Limit State ◽

Three Dimensional ◽

Latin Hypercube Sampling ◽

Failure Criteria ◽

Design Parameters ◽

State Function ◽

Element Analysis ◽

Pavement Structure

The design of asphalt pavements in china is currently based on the multilayered elastic method, which is analytical in nature and yields stresses, strains, and deflections in the pavement system for a particular loading condition and pavement geometry, which are compared with established failure criteria to determine the performance of the given pavement. This design approaches is deterministic. In this paper, typical asphalt pavement structure reliability analysis was performed in which factors that affect pavement reliability regarded as input random , pavement surface deflection, layers of bottom stress and limit state function regarded as output variables , by reliability tool infinite element analysis, base on Monte Carlo’s Latin hypercube sampling method.At last the paper pertinently offered decision basis for improve the reliability of pavement structure and important reference values for drafting and selecting of asphalt pavement design parameters through calculating the reliability of pavement structure, sensitivity analysis of the design parameters is made.

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High-Temperature Rutting Resistance of Inverted Asphalt Pavement Structure

Advances in Civil Engineering ◽

10.1155/2020/1937508 ◽

2020 ◽

Vol 2020 ◽

pp. 1-10

Author(s):

Yingjun Jiang ◽

Yu Zhang ◽

Changqing Deng ◽

Yong Yi ◽

Tian Tian ◽

...

Keyword(s):

High Temperature ◽

Asphalt Pavement ◽

Maximum Shear Stress ◽

Prediction Equation ◽

Structure Design ◽

Asphalt Pavements ◽

Engineering Practice ◽

Wheel Load ◽

Rutting Resistance ◽

Pavement Structure

To improve the high-temperature rutting resistance of asphalt pavements, an inverted asphalt pavement structure (IAPS), 4 cm AC-13 mixture + 8 cm AC-25 mixture + 6 cm AC-20 mixture + 54 cm cement-stabilized macadam, was proposed herein by considering engineering practice, theoretical calculation, and analysis. A rutting prediction equation of asphalt pavements was then proposed via rut-development trends found by laboratory 18 cm thick rutting test. Subsequently, the rutting resistance of the IAPS was evaluated. The results show that, compared with the traditional asphalt pavement structure (TAPS), 4 cm AC-13 mixture + 6 cm AC-20 mixture + 8 cm AC-25 mixture + 54 cm cement-stabilized macadam, the maximum shear stress of the IAPS can be reduced by ∼1.7% along with improvements in rutting resistance by ∼16% and ∼12% under wheel loads of 0.7 and 1.2 MPa, respectively. Wheel-load increase affects the rutting resistance of both structures in a similar manner: when the wheel load increases from 0.7 MPa to 1.2 MPa, the rut depths of both pavement structures increase by at least 63%. The IAPS clearly has better rutting resistance than the TAPS and is thus the better choice for asphalt pavement structure design.

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