Mechanics Analysis of Flexible Base Pavement Structure

Su, Li Ya

doi:10.4028/www.scientific.net/amm.580-583.632

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…ANSYS was used to compute and analyze the foundation of a flexible base asphalt pavement system with various elastic moduli and thicknesses. As a result, a response regarding pavement structure for the base foundation was obtained, serving as a design reference [68]. Also, a comparison of the season-dependent equal temperature to the effect of seasonal temperature changes on the fatigue strength of flexible and semi-rigid pavement systems of flexible and semi-rigid pavement systems at the yearly equivalent temperature of 10℃was performed [69].…”

Section: Ansysmentioning

confidence: 99%

Roadway Pavement Design Methods, Structural Approaches and Relevant Computer Algorithms: A Critical Review

Mensahn¹,

Wada²,

Lugeiyamu³

2022

IJTET

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Transport and international agencies invest millions of dollars on road projects to support countries develop their infrastructure; therefore, it is important to ensure longer service life and value for money. The primary function of the pavement structure is to keep distresses, including fatigue cracking and permanent deformation, to an acceptable limit so that the pavement can withstand applied vehicle load and repetitions during the service duration. Furthermore, the layered structure of the pavement is intended to ensure that the vehicle contact pressure is distributed in such a way that critical responses at the bottom layer of the pavement are low enough to avoid severe damage. Two typical procedures associated with roadway pavement design are empirical-based and structural analysis methods. However, the empirical-based methods have significant shortcomings, as predicting the mode and extent of pavement performance becomes a major challenge. Alternatively, the structural analysis methods have advanced extensively with computers since they consider crucial factors such as traffic loads, material characteristics and environmental conditions. The imputation of these parameters into the computer algorithm contributes to a better understanding of the mechanical performance of constituent pavement material responses. The predicted responses enable highway engineers to select appropriate pavement compositions that will deteriorate at a satisfactory level during the time of service. The most common structural analysis approaches are analytical modelling and numerical simulation. On the other hand, differences in analysis results generation using these approaches have been a notable concern. This review article presents a synopsis of typical pavement design methods and the problem connected with them; structural approaches to identify factors influencing their accuracy. Furthermore, computer algorithms use due to their usefulness, and the assumptions of layered theories employed in pavement structural design are discussed to uncover potential drawbacks for future upgrades.

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Section: Ansysmentioning

confidence: 99%

Roadway Pavement Design Methods, Structural Approaches and Relevant Computer Algorithms: A Critical Review

Mensahn¹,

Wada²,

Lugeiyamu³

2022

IJTET

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“…The latest National Highway Network Planning points out that China will build 26,000 kilometers of expressways and 34,000 kilometers of ordinary highways by 2035. However, there are common problems for the current road subgrade, such as poor coordination of rigid subgrade deformation, difficulty in controlling reflective cracks in semi-rigid subgrade, and low bearing capacity of flexible subgrade, which seriously affects the quality of road surface [1]. In addition, the rapid development of transportation has led to an increasing demand for materials such as cement and lime in road subgrade construction.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of road performance and micro-mechanism analysis of bentonite plastic concrete subgrade

Guoming,

Xiaolin,

Zenghui

et al. 2024

Mater. Res. Express

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This study evaluated the performance of bentonite plasticized concrete with good deformation coordination as a road base material, to address the poor deformation coordination of rigid base layers in roads. Through tests such as slump, strength, permeability, and scanning electron microscopy (SEM) and X-ray diffraction (XRD), the study analyzed the variations in workability, mechanical properties, and durability of plastic concrete as a base material under different bentonite and cement contents, as well as the underlying micro-mechanisms. The results showed that plastic concrete exhibited good workability, which improved with increased bentonite and cement content. The 28-day mechanical properties of the plastic concrete met the design criteria for road base layers and had features of higher load-bearing capacity, good toughness, slow strength attenuation, and overall integrity. In durability, the increase of bentonite content enhanced the concrete's permeability, but decreased abrasivenes and shrinkage. From economic, performance, and engineering perspectives, the optimal bentonite and cement contents for the plastic concrete base were in the ranges of 90kg/m3 to 120kg/m3 and 110kg/m3 to 150kg/m3, respectively.

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“…Qi [11] studied the dynamic and static spring back modulus tests and field CBR tests of continuously graded crushed stone base materials in the laboratory and found that with an increase in the load capacity, the modulus of graded crushed stone materials gradually increased. Li [12] compared the mechanical characteristics of semi-rigid pavement and flexible pavement and obtained the influence law of different structural layer thicknesses on pavement load and the mechanical response law and trend of asphalt pavement structural layer. Through a lot of research on the mechanical properties of base layer material, the load capacity of base layer material was constantly optimized and improved, which was conducive to reducing transverse shrinkage cracking of asphalt pavement [13,14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Asphalt Pavement Base Layers on Transverse Shrinkage Cracking Characteristics

et al. 2023

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Transverse shrinkage cracking is considered to be one of the main factors leading to the degradation of sustainable service performance for asphalt pavement, but the effect of base layers on it is rarely studied. To investigate the effect of asphalt pavement base layers on transverse shrinkage cracking characteristics, this study analyzed and evaluated it through the test section data. The transverse shrinkage cracking test section data of four different asphalt pavement base layers were compared, and the variation characteristics of transverse shrinkage cracking under the influence of the base layer types and temperature were analyzed. Based on the conventional characteristics, the concept and calculation method of cracking area ratio (CAR) was proposed, and its rationality and accuracy were proved by calculation. It has been found that the CAR can reflect the longitudinal shrinkage performance of asphalt pavement. The shrinkage rate of a semi-rigid base is larger, while the shrinkage performance of a flexible base is better, and the shrinkage performance of the whole pavement is not affected by a small amount of cement. The research provides a practical basis for improving the anti-cracking performance of asphalt pavement and helps to enhance its sustainable service performance.

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Mechanics Analysis of Flexible Base Pavement Structure

Cited by 3 publications

References 1 publication

Roadway Pavement Design Methods, Structural Approaches and Relevant Computer Algorithms: A Critical Review

Roadway Pavement Design Methods, Structural Approaches and Relevant Computer Algorithms: A Critical Review

Evaluation of road performance and micro-mechanism analysis of bentonite plastic concrete subgrade

Effect of Asphalt Pavement Base Layers on Transverse Shrinkage Cracking Characteristics

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