scholarly journals Analysis on Mechanical Behavior of Typical Asphalt Pavement Structure based on the Tire Load Effect

2021 ◽  
pp. 338-344
Author(s):  
Fuming Liu, Liming Zhang, Hongyan Sun
Keyword(s):  
Mechanical Behavior ◽  
Asphalt Pavement ◽  
Science And Technology ◽  
National Development ◽  
Road Construction ◽  
Design Specification ◽  
Load Effect ◽  
The Road ◽  
Significant Difference ◽  
Pavement Structure

Further development of modern science and technology has made more science and technology technologies used in the modern social and life practice, and much more is this with the road construction. National development cannot be separate from the convenient traffic facilities, and in the current stage, the asphalt pavement design specification in China requires the road construction by simulating the force of the vehicle on the pavement structure with the round uniformly distributed load under the supposition of continuous interlayer pavement structure. However, as time goes on, the disadvantages of such design specification have gradually exposed, in which different materials, construction schedule and weather conditions will result in the significant difference in the asphalt pavement construction, thus resulting in weak interlayer viscous structure of the pavement, and finally causing the road subsidence and cracking. For this reason, this article has analyzed the mechanical behavior of typical asphalt pavement structure on the basis of explaining the influencing factors of the tire on typical asphalt pavement pressure under the tire load effect, with the expectation that there will be more professional construction of the asphalt pavement.

scholarly journals A Case Study of Industrial Symbiosis to Reduce GHG Emissions: Performance Analysis and LCA of Asphalt Concretes Made With RAP Aggregates and Steel Slags

2020 ◽  
Vol 7 ◽  
Author(s):  
Alessandra Bonoli ◽  
Anna Degli Esposti ◽  
Chiara Magrini
Keyword(s):  
Life Cycle ◽  
Asphalt Pavement ◽  
Ghg Emissions ◽  
Road Construction ◽  
Industrial Symbiosis ◽  
Current Case ◽  
Recycled Materials ◽  
The Road ◽  
Emilia Romagna Region

The concept of sustainability in the road construction sector is a complex issue because of the various steps that contribute to the production and release of greenhouse gas (GHG) emissions. Addressing this issue, the European Commission has put various policy initiatives in place to encourage the construction industry to adopt circular economy (CE) and industrial symbiosis (IS) principles e.g., the use of recycled materials. Cooperativa Trasporti Imola (CTI), a company located in the Emilia-Romagna region (Italy), has been chosen for the current case study to examine practices, management, and the industrial symbiosis network among various companies in the road construction and rehabilitation sector. In this regard, the use of steel slags, obtained by an electric arc furnace (EAF), and reclaimed asphalt pavement (RAP), obtained by the deconstruction and milling of old asphalt pavement have been investigated. Two mixtures of recycled hot Mix Asphalt (HMA) i) were prepared incorporating different recycled material percentages for the wearing and binder course, respectively, ii) were characterized in terms of size distribution, strength modulus and volumetric properties, iii) and finally were compared to the performances of two mixtures entirely designed by virgin materials for the wearing and binder course, respectively. Therefore, the Life Cycle Assessment (LCA) tool was chosen to evaluate the environmental impacts that affect the designed road life cycle. The results show that recycling RAP and EAF slags in a CTI batch plant provides benefits by reducing the consumption of virgin bitumen and aggregates and by reducing CO2eq emissions. Finally, practical implications on the use of recycled materials in new asphalt mixtures from a life cycle and industrial symbiosis perspective are provided.

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 Non-autoclaved foam concrete for layers of highways surface dressing

2020 ◽  
Vol 2020 (2) ◽  
pp. 35-41
Author(s):  
Iryna Hornikovska ◽  
◽  
Vadym Kahanov ◽  
Keyword(s):  
Operating Cost ◽  
Road Construction ◽  
Road Surface ◽  
Transport Infrastructure ◽  
Foam Concrete ◽  
Insulating Material ◽  
The Road ◽  
Effective Heat ◽  
Geographical Regions ◽  
Pavement Structure

The article is devoted to the problems associated freeze with the calculated estimation of the parameters of the structural and heat-insulating antifreeze layer in the subgrade of non-rigid roads on various soil bases. The main physical, technical and deformation characteristics of monolithic dispersed non-autoclaved foam concrete reinforced with polypropylene fiber of grades of density from 600 to 1000 kg/m3 are investigated. Freezing of subsoil waters directly under the roadway pavement and, as a result, its increase in volume, leads to significant deformations of the road surface. Under such conditions, the period of defectfree operation of the roadway pavement is significantly reduced, which in turn leads to the need to repair it in a more intensive mode. One of the ways to reduce the operating cost and maintenance costs of the road transport infrastructure is to introduce into the design and construction practice new structural concepts for road surface dressing that ensure high quality pavement during the normative operational period. This can be achieved by introducing an effective heat-insulating material into the pavement structure as an anti-frost layer in order to elimi-nate the effect of frost lift of the roadway pavement of non-rigid roads. Since domestic and foreign experience freeze in the road construction has proven the effectiveness of the use of heatinsulating materials in the road surface dressing construction, in recent years in Ukraine there has been increased interest in the use of non-autoclaved foam concrete as a modern and highly effective heat-insulating material in road construction. The installation of a heat-insulating layer made of non-autoclaved foam concrete allows us to completely or partially prevent freezing or overheating of the surface dressing base, reduce the influence of periodic variations in environmental temperature, which in turn will increase the durability of the pavement structure. The publication presents nomograms for determining the optimal thickness of the heat-insulating anti-frost heavy course (layer) of road surface dressing (based on sand, loamy sand, clay and loam) done at the street and road network for all climatic and geographical regions of Ukraine.

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 Failure Reasons and Testing Methods of the Asphalt Pavement

2014 ◽  
Vol 1030-1032 ◽  
pp. 1120-1122
Author(s):  
Peng Fei Li ◽  
Jing Hui Liu ◽  
De Xin Lei ◽  
Zhi Zhong Li
Keyword(s):  
Asphalt Pavement ◽  
Rapid Development ◽  
Road Construction ◽  
Construction Process ◽  
The Road ◽  
Natural Factors ◽  
Road Load ◽  
Country Road ◽  
Pavement Damage

With the rapid development of our economy, also promotes the development of our country road. Though the road construction starts relatively late in our country, but its development is very quick. However, due to the technology is not very mature, and the road load is bigger, and the influence of climate and so on, makes appeared different degree of damage of asphalt pavement. So how to improve the quality of the road is also became a problem to be solved in engineering. This article mainly from the problems existing in the construction process, the influence of natural factors and human factors, analyses the reason of pavement damage, and how to detect damage of asphalt pavement.

scholarly journals Authors: Yunhui Zeng ; Wenjuan Hu ; Hongfei Guo ; Shiyue Shen ; Li Huang ; Yiying Lou

2019 ◽  
pp. 57-66
Author(s):  
Yunhui Zeng ◽  
Wenjuan Hu ◽  
Hongfei Guo ◽  
Shiyue Shen ◽  
Li Huang ◽  
...  
Keyword(s):  
Traffic Congestion ◽  
Traffic Management ◽  
Road Traffic ◽  
Spline Interpolation ◽  
Road Construction ◽  
Traffic Condition ◽  
The Road ◽  
Traffic Capacity ◽  
Significant Difference ◽  
The Difference

Focused on the lane occupancy phenomenon, this paper analyzes the roads during two different accidents to the evacuation period. Firstly, according to the statistical data, this paper calculated the correction coefficients under the road traffic condition, and then obtained the actual traffic capacity result at each moment of the road when combining the function model of the actual traffic capacity corrected by the running speed and the road traffic condition. Next the actual traffic capacity results are fitted to the Smooth spline interpolation, and then the actual traffic capacity is further verified by the traffic congestion situation. The actual traffic capacity of the road during the accident to evacuation is summarized as follows: the actual traffic capacity shows a nonlinear trend, that is, ascending-attenuating-recovering and gradually stabilizing. Finally, using Mann-Whitney U test to carry out the difference test on the actual traffic capacity, it is found that there is significant difference between the two groups of data, and the actual traffic capacity of the second case is stronger than that of the first one, and the reasons for the difference are analyzed as follows: the ratio of the steering traffic volume at the downstream intersection is different; this road section includes the community intersection and there are vehicles entering and leaving; meanwhile the speed of each lane is different and there are buildings near the lane. The above conclusions will provide theoretical basis for the traffic management department to correctly guide the vehicle driving, approve the road construction, design the road channelization plan, set the roadside parking space and the non-port-type bus stations.

scholarly journals Choice of road building technology - statistic analyses with the use of the Hellwig method

2018 ◽  
Vol 45 ◽  
pp. 00081 ◽  
Author(s):  
Izabela Skrzypczak ◽  
Wojciech Radwański ◽  
Tomasz Pytlowany
Keyword(s):  
Building Materials ◽  
Asphalt Pavement ◽  
Road Construction ◽  
Concrete Pavements ◽  
Pavement Maintenance ◽  
Road Building ◽  
The Road ◽  
Building Technology ◽  
Advantages And Disadvantages ◽  
The Moment

There are two technologies for road construction, e.g. an asphalt one and a concrete one, that exist in the market of road infrastructure at the moment and they both have their advantages and disadvantages [prof Jan Deja of Krakow Mining Academy, Cathedral of Building Materials Technology].The advantage of concrete pavement consists of the fact that it doesn’t require bigger financial expenditures within 10 – 20 years of exploitation (provided that necessary pavement maintenance treatments are carried out). In the case of asphalt pavement it is necessary to mill the wear off layer of the road already after 6-7 years. It leads to the question: which of these technologies should be chosen, which is better? The work hereby carries on analyses concerning a comparison of the technologies for road constructions; the asphalt one and the concrete one. Based on the analyses carried out with the use of the Hellwig method it was found that the achieved values of synthetic meters for asphalt and concrete pavements are close to each other, which may indicate that both technologies are comparable within the sectors taken for analyses in relation to accepted technological-technical and usability features.

scholarly journals Decision of National and Provincial Highway Asphalt Pavement Structure Based on Value Engineering

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Yingwei Ren ◽  
Jingsong Shan
Keyword(s):  
Evaluation Method ◽  
Asphalt Pavement ◽  
Value Engineering ◽  
Pavement Performance ◽  
Road Maintenance ◽  
Good Reliability ◽  
Financial Investment ◽  
The Road ◽  
Engineering Theory ◽  
Pavement Structure

It is important that decision of asphalt pavement structure requires overall considerations of the performance and financial investment. To have asphalt pavement structure fulfilling good reliability, the asphalt pavement structure decision was researched based on value engineering theory. According to the national and provincial highway investigation data in Shandong Province during the last decade, the asphalt pavement performance attenuation rules of traffic levels and asphalt layer thicknesses were developed, and then the road performance evaluation method was presented. In addition, the initial investments, the costs of road maintenance, and middle-scale repair in a period were analyzed. For the light traffic and medium traffic example, using the value engineering method, the pavement performance and costs of which thickness varies from 6 cm to 10 cm were calculated and compared. It was concluded that value engineering was an effective method in deciding the asphalt pavement structure.

scholarly journals Application of Response Surface Method for Analyzing Pavement Performance

2021 ◽  
Author(s):  
Seyed Reza Omranian
Keyword(s):  
Response Surface ◽  
Response Surface Method ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Road Construction ◽  
Pavement Performance ◽  
Pavement Materials ◽  
The Road ◽  
Surface Method ◽  
Pavement Service Life

Hot mix asphalt (HMA) is a common material that has been largely used in the road construction industries. The main constituents of HMA are asphalt binder, mineral aggregate, and filler. The asphalt binder bounds aggregate and filler particles together and also waterproofs the mixture. The aggregate acts as a stone skeleton to impart strength and toughness to the structure, while the filler fills pores in the mixture which can improve adhesion and cohesion as well as moisture resistance. The HMA behavior depends on individual component properties and their combined reaction in the mixture. Asphalt binder properties change due to different factors. Over the years, asphalt pavement materials age, causing binder embrittlement which adversely affects pavement service life. Response Surface Method (RSM) is a set of techniques that are used to develop a series of experiment designs, determining relationships between experimental factors and responses, and using these relationships to determine the optimum conditions. Incorporating RSM in pavement technologies can beneficially help researchers to develop a better experimental matrix and give them the opportunity to analyze the changes in pavement performance in a faster, more effective, and reliable way.

Dynamic Load of Vehicle on Asphalt Pavement

2014 ◽  
Vol 617 ◽  
pp. 29-33 ◽  
Author(s):  
Jozef Melcer
Keyword(s):  
Numerical Simulation ◽  
Dynamic Load ◽  
Asphalt Pavement ◽  
Moving Load ◽  
Dynamic Effect ◽  
Asphalt Pavements ◽  
Load Effect ◽  
The Road ◽  
Moving Vehicles ◽  
Tire Forces

Asphalt pavements are the transport structures subjected to dynamic effect of moving vehicles. Many effects influence the real values of vehicle tire forces. Road unevenness represents the most important factor influencing the magnitudes of tire forces. Such data can be obtained by numerical or experimental way. The paper deals with the numerical simulation of moving load effect on asphalt pavements and with numerical simulation of tire forces in relation to the road unevenness.

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