Impact of Dual Gauge Railway Tracks on the Traffic Load-Induced Permanent Deformation of Low Embankments

2016 ◽  
Author(s):  
Aaron D. Mwanza ◽  
Peiwen Hao ◽  
Mundia Muya ◽  
Haiwei Zhang
Keyword(s):  
Permanent Deformation ◽  
Traffic Load ◽  
Railway Tracks

scholarly journals Impact of Dual Gauge Railway Tracks on Traffic Load Induced Permanent Deformation of Low Embankments

2016 ◽  
Vol 143 ◽  
pp. 880-887 ◽  
Author(s):  
Aaron D. Mwanza ◽  
Peiwen Hao ◽  
Mundia Muya ◽  
Zhang Haiwei
Keyword(s):  
Permanent Deformation ◽  
Traffic Load ◽  
Railway Tracks

Impact of dual gauge railway tracks on traffic load induced Permanent Deformation of low embankments

2016 ◽  
pp. 813-819
Author(s):  
Aaron Daniel Mwanza ◽  
Peiwen Hao ◽  
Mundia Muya ◽  
Haiwei Zhang
Keyword(s):  
Permanent Deformation ◽  
Traffic Load ◽  
Railway Tracks

scholarly journals Deformation Parameters and Fatigue of the Recycled Asphalt Mixtures

2015 ◽  
Vol 11 (2) ◽  
pp. 115-120
Author(s):  
Juraj Šrámek
Keyword(s):  
Complex Modulus ◽  
Permanent Deformation ◽  
Asphalt Mixtures ◽  
Test Method ◽  
Traffic Load ◽  
Bending Test ◽  
Recycled Asphalt ◽  
The Road ◽  
Dynamic Methods ◽  
Deformation Complex

Abstract The deformational properties of asphalt mixtures measured by dynamic methods and fatigue allow a design the road to suit the expected traffic load. Quality of mixtures is also expressed by the resistance to permanent deformation. Complex modulus of stiffness and fatigue can reliably characterize the proposed mixture of asphalt pavement. The complex modulus (E*) measurement of asphalt mixtures are carried out in laboratory of Department of Construction Management at University of Žilina by two-point bending test method on trapezoid-shaped samples. Today, the fatigue is verified on trapezoid-shaped samples and is assessed by proportional strain at 1 million cycles (ε6). The test equipment and software is used to evaluate fatigue and deformation characteristics.

scholarly journals EFFECTS OF TRAFFIC LOAD, TEMPERATURE AND MATERIAL PROPERTIES ON RUTTING IN FLEXIBLE PAVEMENTS

2021 ◽  
Vol 16 (9) ◽  
Author(s):  
Muhammad Asim
Keyword(s):  
Thermal Loading ◽  
Permanent Deformation ◽  
Thermal Conditions ◽  
Flexible Pavement ◽  
Traffic Load ◽  
Traffic Loading ◽  
Materials Properties ◽  
Modern Times ◽  
Pavement Engineering ◽  
Summer Temperatures

Rutting (permanent deformation) is one of the most common and serious kinds of damage to flexible pavement, particularly in countries with high summer temperatures. Rutting also occurs when there is a lot of traffic and the use of poor materials. Pavement engineering is greatly influenced by the use of materials such as asphalt and cement in modern times. To study the effect of load, high temperature, and materials properties on rutting damage of flexible pavement this paper is the best approach to all these concerned issues related to rutting. Abaqus ver.6.12.1 has been used to simulate flexible pavement under different loading and thermal conditions. Three models have been developed in this paper, the first model simulated against traffic loading only, the second model shows combined traffic and thermal loading while the third model related with the change of materials property in terms of Young’s modulus (E).

scholarly journals Improvement of Sub-Base of Roads by Chemical Admixtures and Organic Materials

2020 ◽  
Vol 9 (3) ◽  
pp. 1666-1672
Keyword(s):  
Sugar Cane ◽  
Soil Stabilization ◽  
Permanent Deformation ◽  
Soft Clay ◽  
Soil Layer ◽  
Fatigue Cracking ◽  
Point Of View ◽  
Traffic Load ◽  
Engineering Properties ◽  
High Plasticity

One of the aspects of increase of earlier damage and failure of traffic load, especially in clayey regions, is the deficiency of pavement subgrade. To prevent such damage, strengthening of the pavement by improving the subgrade layer is essential. Many investigators have carried out research on the subgrade layer, especially when containing clay particles, using several types of additives (stabilizers). Soil Stabilization is a method of improving the engineering properties of soil and therefore making it more stable. Generally, stabilization includes pre-consolidation, compaction and numerous other similar methods. However, stabilization is usually related to the processes which modify the soil composition itself for enhancement of its properties. Soil stabilization of pavements is usually designed based on the assumption that specified levels of quality will be achieved for each soil layer in the pavement system. Each layer must resist shearing within the layer, avoid excessive elastic deformations that would result in fatigue cracking within the layer or in overlying layers, and prevent excessive permanent deformation through densification. Engineers are responsible for selecting or specifying the correct stabilizing method, technique, and quantity of material required. Usually, the technology provides an alternative provision structural solution to a practical problem. The simplest stabilization processes are compaction and drainage. The other process is by improving gradation of particle size and further improvement can be achieved by adding binders to the weak soils. This study showed that lime activated by sodium chloride in combination with sugar cane ash could be effectively used to improve soft clay with low soaked CBR value and high plasticity. Therefore, from the environmental point of view, it was recommended that sugar cane ash can partially replace lime in clay stabilization to form material with cementitous properties

scholarly journals Deformasi Permanen dan Modulus Resilien Campuran AC-BC Modified Menggunakan Aspal Multigrade

2019 ◽  
Vol 7 (2) ◽  
pp. 60-68
Author(s):  
Desy Yofianti
Keyword(s):  
Climate Change ◽  
High Pressure ◽  
Asphalt Concrete ◽  
Resilient Modulus ◽  
Permanent Deformation ◽  
Asphalt Mixture ◽  
Flexible Pavement ◽  
Traffic Load ◽  
Wheel Tracking Test ◽  
Wheel Tracking

Multigrade asphalt use is an alternative method for handling road deterioration problem, e.g. a rutting, due to the repetitive traffic load and high pressure from vehicle wheels. In addition, the multigrade asphalt has been widely used to reduce temperature sensitivity of the asphalt mixture in flexible pavement due to an unpredictable climate change. Rutting is also caused by the accumulation of permanent deformations from all layers in the pavement structure. This study aims to analyze the permanent deformation value and the resilient modulus of an Asphalt Concrete Binder Course (AC-BC) modified mixture through the use of multigrade asphalt. The Wheel Tracking Test and UMATTA Test were used to test the specimens. The Tests on samples were carried out at temperatures of 35oC and 50oC. The results showed that the permanent deformation value of the AC-BC with multigrade asphalt had a better deformation resistance than the 60/70 pen bitumen mixture at 35oC. At the temperature of 50oC, the multigrade asphalt mixture had a smaller permanent deformation value (0.92 mm) compared to the 60/70 pen bitumen mixture. At the temperature of 35oC, multigrade asphalt mixture had a resilient modulus value of 1.04 times greater than the 60/70 pen bitumen mixture and at the temperature of 50oC, this mixture had a resilient modulus value of 1.16 times greater than the 60/70 pen bitumen mixture. Therefore, this study concluded that the increase/decrease of value of permanent deformation and resilient modulus were influenced by the temperature and types of asphalt in the mixture.

Structural Response Analysis of Highways under Heavy Loads

2013 ◽  
Vol 723 ◽  
pp. 204-211
Author(s):  
Ke Hao Zeng ◽  
Run Hua Guo ◽  
Hong Xue Li
Keyword(s):  
High Speed ◽  
Mechanical Response ◽  
Negative Impact ◽  
Heavy Traffic ◽  
Permanent Deformation ◽  
Road Construction ◽  
Element Model ◽  
Traffic Load ◽  
Economic Losses ◽  
Response Analysis

As China's economic development, substantial growth in traffic, the importance of subgrade in road construction is escalated. Under the vehicle load, subgrade deformation will continue to accumulate and ultimately lead to subgrade permanent deformation. Excessive permanent deformation of subgrade soil will cause enormous economic losses, especially in rutting deformation, and have a direct impact on road performance in safety and comfort. Meanwhile, permanent deformation of subgrade will affect the structural performance of pavement, causing the other forms of damage. For example, the emergence and strengthening of reflective cracking, or accelerated fatigue failure because of too heavy tensile strain (or tensile stress) on the underside of the surface layer, and then caused great negative impact on the pavement structure and service performance. This article examines the role of high-speed heavy traffic load characteristics, and set up finite element model analysis for semi-rigid road structure, the most widely used internal road style, to obtain the mechanical response characteristics under high-speed heavy traffic loads.

scholarly journals Characteristics Buton Natural Asphalt-Rubber (BNA-R) on the Performance Improvement of Warm Mix Asphalt Using Natural Zeolite

2018 ◽  
Vol 34 ◽  
pp. 01032 ◽  
Author(s):  
Nurul Wahjuningsih ◽  
Sigit Pranowo Hadiwardoyo ◽  
R Jachrizal Sumabrata
Keyword(s):  
Natural Zeolite ◽  
Complex Modulus ◽  
Heavy Traffic ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Traffic Load ◽  
Test Machine ◽  
Road Maintenance

The decrease in the ability of service of pavement can be caused by the durability factor in the pavement layer in receiving heavy traffic load and the temperature of the pavement. Permanent deformation is one of the criteria of failure of asphalt mixture. Performance assessment of the asphalt mixture can be observed from the rheological properties of asphalt binder. The use of BNA-R in this study is intended to modify the characteristics of bitumen penetration grade 60 / 70 used in warm mix asphalt. Warm mix asphalt with lower temperatures of mixing and compaction than conventional asphalt mixtures was chosen because it is more environmentally friendly. To reduce the temperature in this warm asphalt technology is achieved by using natural zeolite. Both of these materials are local materials that are widely available in Indonesia. The rheology of asphalt 60/70 modified with BNA-R indicates that the addition of BNA-R in the base asphalt increase the complex modulus value and decrease the phase angle value. These values were related to the performance of mixture in the permanent deformation criteria. Reducing the temperature of mixing and compaction should be balanced with modifying the asphalt binder used. Rutting due to permanent deformation can resulted in inconvenience to the passengers and can lead to high costs of road maintenance. To determine the permanent deformation of asphalt mix with material combinations was performed through the wheel tracking test machine with 3,780 cycles for 3 hours. The results shows that after test track over 7 thousand passes have seen permanent deformation characteristics of asphalt concrete mixture with a variation of the characteristics of bitumen.

scholarly journals Asphalt concretes with metal-organic frameworks for highways and expressway road surfaces

2018 ◽  
Vol 2018 (11) ◽  
pp. 85-93
Author(s):  
Paweł Mieczkowski ◽  
Robert Jurczak ◽  
Bartosz Budziński
Keyword(s):  
Asphalt Concrete ◽  
Permanent Deformation ◽  
Traffic Load ◽  
Freeze Thaw ◽  
Before And After ◽  
Metal Organic ◽  
Short And Long Term ◽  
Modified Binder ◽  
Organic Catalyst

The aim of performed research and analysis is the evaluation of the influence of metal-organic catalyst (MOC) on the properties of asphalt concretes designed for KR5-7 traffic load. The anhydrous iron (III) chloride was added as a metal-organic catalyst in the amount of 2,5% of asphalt mass. The study determined the properties of asphalt concrete with modified binder (70/100+2,5% FeCl3) and referential asphalt concrete with typical binder 35/50. The test included determination of water and freeze-thaw resistance (ITSR) and resistance to permanent deformation. Additional basic tests were performed to compare the properties of modifies, the 70/100 and 35/50 asphalt. The research was performed for three binder conditions: before aging, short-term aging in accordance with RTFOT and PAV long-term aging. The test results allowed to determine the IP penetration index. Additionally, for 35/50 asphalt and modified binder the dynamic viscosity was determined before and after aging in accordance with RTFOT. The addition of metal-organic catalyst increased the resistance of the asphalt concrete to permanent deformation without changing its water and freeze-thaw resistance. In case of the 70/100 asphalt the addition of MOC improved the hardness (especially after short- and long-term aging) and influenced the rheology.

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