The impact of data noise on permanent deformation behaviour of asphalt concrete mixtures

2018 ◽  
Vol 21 (12) ◽  
pp. 1470-1481
Author(s):  
Yasir Ali ◽  
Muhammad Irfan ◽  
Etikaf Hussain
Keyword(s):  
Asphalt Concrete ◽  
Deformation Behaviour ◽  
Permanent Deformation ◽  
Data Noise ◽  
Concrete Mixtures ◽  
The Impact

Mitigation of permanent deformation in base layer containing recycled asphalt aggregates

2013 ◽  
Vol 40 (2) ◽  
pp. 181-187 ◽  
Author(s):  
Jean-Pascal Bilodeau ◽  
Guy Doré ◽  
Jonas Depatie
Keyword(s):  
Asphalt Concrete ◽  
Deformation Behaviour ◽  
Permanent Deformation ◽  
Design Procedure ◽  
Base Layer ◽  
Repeated Loading ◽  
Recycled Asphalt ◽  
Thickness Increase ◽  
Permanent Strain ◽  
Pavement Base

The use of recycled asphalt pavement (RAP) aggregates as replacement for new materials in the pavement base weakens the layer in regards to the resistance to permanent deformation under repeated loading. A mechanistic based design procedure is proposed to ensure that base layers containing RAP particles have a similar rutting behaviour to base layers made of virgin aggregates. The design procedure allows calculating an asphalt concrete thickness increase that is based on permanent deformation behaviour of base materials. The calculation approach is based on multistage triaxial permanent deformation tests performed on granular material samples with varied RAP content. The tests allowed proposing an equation that relates permanent strain rate, RAP content, and deviatoric stress, which is the basis of the design procedure. Design charts are proposed to select adequate thickness increase for the asphalt concrete layer according to the expected RAP content in the base layer and asphalt concrete modulus.

scholarly journals Influence of Hydrated Lime on the Properties and Permanent Deformation of the Asphalt Concrete Layers in Pavement

2015 ◽  
Vol 4 (1) ◽  
pp. 1-19 ◽  
Author(s):  
Ahmed F. Al-Tameemi ◽  
Yu Wang ◽  
Amjad Albayati
Keyword(s):  
Asphalt Concrete ◽  
Raw Materials ◽  
Permanent Deformation ◽  
Fatigue Cracking ◽  
Hydrated Lime ◽  
Concrete Pavement ◽  
Partial Replacement ◽  
Repeated Loading ◽  
Concrete Mixtures ◽  
Asphalt Concrete Pavement

Abstract Flexible or asphalt concrete pavement is the paving system most widely adopted all over the world. It has been recognized that there are many different types of the factors affecting the performance and durability of asphalt concrete pavement, including the service conditions, such as: the variation of temperature from mild to extremes and the repeated excessive axle loading as well as the inadequate quality of the raw materials. All of these when combined together are going to accelerate the occurrence of distresses in flexible pavement such as permanent deformation and fatigue cracking. As the result, there has an urgent need to enhance the ability of asphalt concrete mixture to resist distresses happened in pavement. Use of additives is one of the techniques adopted to improve pavement properties. It has been found that hydrated lime might be one of the effective additives because it is widely available and relatively cheap compared to other modifiers like polymers. This paper presents an experimental study of the hydrated-lime modified asphalt concrete mixtures. Five different percentages of the hydrated lime additive were investigated, namely (1, 1.5, 2, 2.5 and 3 percent). The hydrated lime additive was used as partial replacement of limestone filler by total weight of the aggregate. The designed Hot Mix Asphalt (HMA) concretes are for the application of three pavement courses, i.e. Surface, Leveling and Base. These mixtures are designed and tested following Marshall procedure and uniaxial repeated loading to evaluate permanent deformation at different temperatures of 20°C, 40°C and 60°C. The experimental results show that the addition of hydrated lime as a partial replacement of ordinary limestone mineral filler results a significant improvement on mechanical properties and the resistant to permanent deformation of the designed asphalt concrete mixtures.

scholarly journals Recovery of the bitumen and asphalt concrete properties with rejuvenator

2021 ◽  
pp. 6-17
Author(s):  
Yan Pyrig ◽  
Andrii Galkin ◽  
Serhii Oksak ◽  
Yaroslav Ilin ◽  
Yana Shyika
Keyword(s):  
Quality Indicators ◽  
Asphalt Concrete ◽  
Road Maintenance ◽  
Adhesion Properties ◽  
Concrete Mixtures ◽  
Road Section ◽  
Standard Quality ◽  
The Impact ◽  
Main Factor

The main factor in the decreasing in the quality of asphalt concrete with time is thehardening of the bituminous binder, which occurs under the influence of high environmentaltemperatures, moisture and oxygen. Considering this, one of the ways to extend the service life ofasphalt pavements isto implement procedures to prevent deterioration of the properties of bituminousbinders, which occurs due to its hardening. To solve the problem of hardening, the use of variousrejuvenators becomes widespread in road maintenance around the world. The aim of the researchwork is to analyze the effect of the domestic rejuvenator Lux «ЕD-L» on the properties of roadbitumen and asphalt concrete made with this binder. The effect of the rejuvenator on the propertiesof bitumen is evaluated in three ways: finding the influence of Lux «ЕD-L» on the properties of theoriginal bitumen; finding the ability to restore the properties of RTFOT-hardened bitumen by addingan additive to the hardened binder; finding the effect on the intensity of hardening by hardening ofbitumen, which includes the Lux «ЕD-L» additive in its composition. In addition, according to thisscheme, it is evaluating the effect of the rejuvenator on asphalt concrete mixtures, which areconditioned according to the method of AASHTO R 30-02. Based on the obtained experimental data,it is found that the modification of the RTFOT-hardened bitumen with Lux «ЕD-L» additive improvesbinder’s properties, which results in the returning of the values of standard quality indicators(penetration, softening point and breaking point temperatures) to the initial level of values quality ofbitumen before hardening. Lux «ЕD-L» additive significantly improves the adhesion properties ofbitumen (both original and aged). Evaluation of the impact of the rejuvenator on the properties ofasphalt mixtures after conditioning confirmed its effectiveness. The properties of asphalt concrete made from mixtures after conditioning, which were treated with the Lux «ЕD-L» additive, accordingto obtained quality indicators is equal to the asphalt concrete with the original bitumen. A field testof the effect of the Lux «ЕD-L» additive on the properties of the asphalt pavement is in process. Theresults of field test will be obtained after 3 and 9 months of operation of the treated road section.

Investigating the impact of different loading patterns on the permanent deformation behaviour in hot mix asphalt

2018 ◽  
Vol 167 ◽  
pp. 707-715 ◽  
Author(s):  
Seyed Mohsen Motevalizadeh ◽  
Pooyan Ayar ◽  
Seyed Hossein Motevalizadeh ◽  
Sadegh Yeganeh ◽  
Mahmoud Ameri ◽  
...  
Keyword(s):  
Hot Mix Asphalt ◽  
Deformation Behaviour ◽  
Permanent Deformation ◽  
Loading Patterns ◽  
The Impact

scholarly journals Ensuring the shear resistance of asphalt mixtures in the pavement of highways

2018 ◽  
Vol 5 (3) ◽  
Author(s):  
Zelgedin Mevlidinov ◽  
Tatiana Levkovich ◽  
Anastasia Bilсko
Keyword(s):  
Carbon Black ◽  
Asphalt Concrete ◽  
Residual Deformation ◽  
Shear Resistance ◽  
The State ◽  
Shear Stresses ◽  
Concrete Mixtures ◽  
Concrete Mix ◽  
Used Car ◽  
The Impact

Studying the state of the issue on the shear resistance of asphalt concrete mixtures in the pavement, the authors reviewed the currently available technical reference literature. The state of the streets of the city of Bryansk and the highways of the Bryansk region by measuring the depth of the tracks and flows was also examined. The asphalt concrete samples were tested in laboratory conditions taking into account the rate of deformation, temperature and stress-strain state using the device manufactured at the Department of «Highways» of the Bryansk state engineering and technological University. As additives in asphalt concrete mix introduced: rubber crumb from used car tyres, wheels automobiles, carbon black (powder form) and definiltely thermoplastics. The conducted researches on samples of asphalt concrete mix with use of divinyl-styrene thermoplastics (DST) showed that at increase in the polymer content from 2 to 5 % there was some increase in durability of asphalt concrete on tension in 1,06…1,16 times at 0 °C (smaller value corresponds to the smaller number of DST). Compressive strength at a temperature of «plus» 50 °C increased by 1.04…1.08 times and the module of residual deformation at «plus» 50 °C increased by 1.18…1.23 times. In General, with an increase in the content of DST from 2 to 5 %, the shear resistance increased almost 1.27 times (with the introduction of 5 % DST over the mass of bitumen). The conducted research allows to conclude that to reduce the impact of shear stresses in asphalt concrete mixtures it is necessary to introduce modifying additives, the properties of asphalt concrete depend on the presence of additives, as well as on the quality of the stone aggregate, bitumen and other materials. With the introduction of certain additives (DST, carbon black, rubber c hips), the shear resistance of asphalt concrete increases.

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