scholarly journals Response Characteristics of Inverted-base Asphalt Pavement Structure in Cold Area under Multi-axle Loads

2020 ◽  
Vol 7 (4) ◽  
pp. 141-146
Author(s):  
Lin Wang ◽  
Chao Shan ◽  
Chuanfeng Zheng
Keyword(s):  
Tensile Stress ◽  
Asphalt Pavement ◽  
Base Layer ◽  
Rigid Base ◽  
Element Analysis ◽  
The Road ◽  
Response Characteristics ◽  
Pavement Structure ◽  
Axle Loads ◽  
Base Course

In cold areas, semi-rigid base asphalt pavement is prone to generate reflection cracks due to thermal contraction and dry shrinkage, and the base layer cracks can cause surface layer cracking and shorten the service life of the pavement. Aiming at understanding the response characteristics of asphalt pavement structure under multi-axle loads in cold areas, this paper took semi-rigid base asphalt pavement and inverted-base asphalt pavement as the research objects, and employed ANSYS to conduct finite element analysis on them to figure out the response characteristics of the asphalt pavement structure under the condition of different multi-axle loads and graded macadam base course. The research results showed that, the action of multi-axal loads increased the tensile stress of the base layer of the asphalt pavement and the tensile stress of the base layer of the semi-rigid base asphalt pavement, and increased the road surface deflection, which had resulted in insufficient bearing capacity of the pavement structure, and thus causing significant damages to the asphalt pavement; analysis of the response characteristics of the two types of asphalt pavement showed that, adding a graded macadam base course as the stress-absorbing layer is conductive to reducing the tensile stress of the base layer of the semi-rigid base asphalt pavement and effectively delaying or inhibiting reflection cracks generating on the pavement. The study of this paper provided a theoretical reference for the design and construction of asphalt pavement.

The Study on Road Performance and Pavement Structure Analysis for the Base Layer Material Stabilized by SRX

2012 ◽  
Vol 594-597 ◽  
pp. 1402-1406 ◽  
Author(s):  
Yue Zhang ◽  
Yun Long Zhao ◽  
Bao Yang Yu
Keyword(s):  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Base Material ◽  
Base Layer ◽  
Rigid Base ◽  
The Road ◽  
Flexible Material ◽  
Calculation Results ◽  
Road Performance ◽  
Pavement Structure

In order to overcome the weakness of semi-rigidity base layer，the road performance of the SRX(Solution Road RomixSoilfix) stabilized base material and the mechanics response of asphalt pavement with the base layer stabilized by SRX have been studied in this paper. The CBR value and resilient modulus of SRX stabilized base material were given by indoor test. Based on the multiple layer elastic theory, both the mechanical responses of asphalt pavement structure with the SRX stabilized base and semi-rigid base were given, and according to the calculation results, the two kinds of pavement structure fatigue life were analyzed. The results have shown that the CBR value of SRX flexible material is greater than that of graded crushed stone; the SRX stable material can be used as pavement base layer, but the fatigue performance of SRX flexible base materials should be paid much attention.

The Composite Asphalt Pavement Structure Serrice Life Analysis which Setting the Graded Gravel between the Asphalt Surface Layer and the Semi-Rigid Base Layer

2012 ◽  
Vol 446-449 ◽  
pp. 2523-2527
Author(s):  
Gui Mei Shi ◽  
Dong Guo Li
Keyword(s):  
Surface Layer ◽  
Service Life ◽  
Asphalt Pavement ◽  
Three Dimensional ◽  
Base Layer ◽  
Rigid Base ◽  
Contact State ◽  
The Road ◽  
Pavement Structure ◽  
Three Dimensional Finite Element

In this article, the three-dimensional finite element method was used to analyse the composite base asphalt pavement structure life, which setting the graded gravel layer between the asphalt surface layer and the semi-rigid base layer. The main effect considering on the service life were the face layer thickness, the graded gravel thickness ,the contact state and so on, and compared the compound base with typical semi-rigid base the service life of the asphalt pavement . The analysis shown that the road surface contact state was the biggest influence to the service life. When using reasonable pavement structure combination, composite base asphalt pavement generally wouldn't produce the service life of the decline .

Mechanics Analysis of Flexible Base Pavement Structure

2014 ◽  
Vol 580-583 ◽  
pp. 632-635
Author(s):  
Li Ya Su
Keyword(s):  
Elastic Modulus ◽  
Tensile Stress ◽  
Asphalt Pavement ◽  
Rapid Development ◽  
Vertical Displacement ◽  
Rigid Base ◽  
Load Factors ◽  
Mechanics Analysis ◽  
Flexible Base ◽  
Pavement Structure

With the rapid development of traffic cause in our country, the operating requirement of driving load factors to pavement structure become higher and higher. The Semi-rigid base asphalt pavement structure exposed some defects and shortcomings, so the study of flexible base asphalt pavement structure is put on the agenda under the circumstances.Based on the research achievements at home and abroad of the existing asphalt pavement structure , choosing different elastic modulus and thickness to calculate and analyze the flexible base by ANSYS, gaining the law and trend of mechanics response (the vertical displacement and tensile stress) about pavement structure for the flexible base pavement of each layer foundation to provide the design reference.

The Tension Fracture Simulation on the Asphalt Pavement with the Insufficient Compaction Roadbed

2011 ◽  
Vol 243-249 ◽  
pp. 3868-3872
Author(s):  
Lai Gui Wang ◽  
Mei Sheng Feng ◽  
Hong Zhu Zhang
Keyword(s):  
Tensile Stress ◽  
Asphalt Pavement ◽  
Crack Model ◽  
Tension Stress ◽  
Wheel Load ◽  
Tension Crack ◽  
Discontinuous Surface ◽  
The Road ◽  
Fracture Simulation ◽  
Pavement Structure

For the study of soft subgrade pavement cracking process, it establishes the pavement structure tension crack model by elastic layered theory. Based on the finite element method, it studies the tension crack evolution process. It establishes the tension crack stress criterion to the roadbed. Analysis shows that the distresses of asphalt pavement of the real highway results from the damage by asymmetric sedimentation which is under excessively axle loading on pavement structure, rather than the fatigue damage by axle loading repetitions in the condition of asymmetric intensity in the same layer. The results show that the soft degree of the subgrade is proportional to the tensile stress, the more localized soft, the easier to crack the road. The soft roadbed does not have a homogeneous structure of the road surface, the tension stress rupture occurred in the discontinuous surface. The road structure has a set of tensile stress under the circulation wheel load, it formats a new fracture surface, and the structure form corresponding evolves, and causes stress state change. At last most of the road sub-base crack, and surface cracking occurres, so the pavement failure.

scholarly journals Responses of Semi-Rigid Base Asphalt Pavement with Interlayer Contact Bonding Model

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Xuntao Wang ◽  
Xuanlong Ma
Keyword(s):  
Asphalt Pavement ◽  
Moving Load ◽  
Friction Model ◽  
Base Layer ◽  
Rigid Base ◽  
Vehicle Speed ◽  
Element Mesh ◽  
Bonding Failure ◽  
Higher Temperature ◽  
Pavement Structure

In this paper, an interlayer contact bonding model according to the Coulomb friction model was developed by contact element and target element to accurately simulate the bonding condition between the adjacent layers of semi-rigid base asphalt pavement. The interlayer contact bonding model can be used to not only simulate the partial bond condition between adjacent layers but also imitate the phenomenon of bonding failure between adjacent layers. Semi-rigid base asphalt pavement structure, finite element mesh, material property with temperature, kinds of interlayer bonding failure, and moving load were explained in detail, and the responses of the semi-rigid base asphalt pavement structure were calculated and analyzed by this model at the room temperature and the higher temperature. The results indicated that the disengaging area between the asphalt concrete layer and the base layer can negatively affect the strain responses of asphalt pavement, especially at the higher temperature, and it can also weaken the asphalt pavement performance with the increase of the disengaging area. The deformation of semi-rigid base asphalt pavement is intensified under the action of the high temperature and the overloads, which would be easy to result in potential pavement structural deficiency. At the higher temperature, the adverse effect of moving loads on asphalt pavement is greater than that of roadbed, and the responses of the asphalt pavement decrease with the increase of the vehicle speed.

Effect of Asphalt Layer Modulus on the Mechanical Properties and Service Life of Heavy Load Semi-Rigid Asphalt Pavement

2011 ◽  
Vol 368-373 ◽  
pp. 193-196
Author(s):  
Xiao Hua Wang ◽  
Ji Shu Sun ◽  
Tian Xiao ◽  
Hui Ran Pi
Keyword(s):  
Mechanical Properties ◽  
Service Life ◽  
Tensile Stress ◽  
Asphalt Pavement ◽  
Pavement Design ◽  
Heavy Load ◽  
Surface Deflection ◽  
Pavement Structure ◽  
Base Course ◽  
Design Result

Asphalt layer modulus is one of the important mechanical parameters in pavement design. It will directly influence the design result and the mechanical properties of asphalt pavement structure. Using pavement design and analysis software, the effects of asphalt layer modulus on surface deflection, tensile stress at the bottom of base and sub-base course, stress at the the bottom of asphalt layer and service life of heavy load semi-rigid asphalt pavement structure were analyzed systematically. And the influencing laws were analyzed, too. The results indicate that the mechanical properties, deforming characteristics and service life of heavy load asphalt pavement were influnced significantly by asphalt layer modulus. With the increasing of asphalt layer modulus, the surface deflection, tensile stress at the bottom of base and sub-base course would significantly decrease, and service life of heavy load semi-rigid asphalt pavement structure would be improved.

scholarly journals Korelasi Nilai CBR Dengan kepadatan Lapangan Subbase Course

2020 ◽  
Vol 1 (2) ◽  
pp. 1-8
Author(s):  
Hayadi . . ◽  
Irwan Lakawa ◽  
Sulaiman .
Keyword(s):  
Carrying Capacity ◽  
Field Testing ◽  
Base Layer ◽  
The Road ◽  
Field Density ◽  
Pavement Structure ◽  
Base Course

The durability of the road flexural pavement structure is largelydetermined by the performance of each layer. One of these factors isthe strength and resilience of the subbase. Compaction inaccordance with applicable standards will produce roads with goodquality so that the road life is longer and there is less damage. Thepurpose of this study is to analyze the carrying capacity using CBR,the value of the field density with the sand cone test and thecorrelation of the CBR value and the Sand cone value of the B gradefoundation layer on the Tugu Munajah network. The researchmethod used is laboratory and field testing combined with adescriptive statistic approach.The results of the study indicate that the carrying capacity using theCBR amounted to 55.02% <60%, the density value field with sandcone test of 72.50% <90%. Correlation of CBR and Sand cone value atthe base layer (sub base course) is very strong at 0.998.

Mechanics Analysis of Semi-Rigid Subgrade Pavement Structure

2014 ◽  
Vol 580-583 ◽  
pp. 105-108
Author(s):  
Li Ya Su
Keyword(s):  
Tensile Stress ◽  
Elasticity Modulus ◽  
Asphalt Pavement ◽  
Vertical Displacement ◽  
Pavement Design ◽  
Rigid Base ◽  
Mechanics Analysis ◽  
Pavement Structure ◽  
Early Damage

The semi-rigid base asphalt pavement structure was choose often used to the highway in our country, but the semi-rigid base asphalt pavement early damage almost has become a common phenomenon.In this paper, the rule and trend of mechanics response about pavement structure (the vertical displacement and tensile stress) were analyzed under the semi-rigid base choose different elasticity modulus and thickness by ANSYS for muti-layer foundation of semi-rigid base pavement design to provide reference.

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