scholarly journals DAMAGE CHARACTERISTICS OF RECYCLED ASPHALT MIXTURES UNDER THE EROSION EFFECT OF SNOW-MELTING SALT

10.6036/10174 ◽  
2021 ◽  
Vol 96 (4) ◽  
pp. 379-387
Author(s):  
Baoyong Xue ◽  
Ping Yao ◽  
Xiaolong Zou ◽  
Qian Liu ◽  
Yanlong Zhao
Keyword(s):  
Asphalt Pavement ◽  
Water Immersion ◽  
Asphalt Mixture ◽  
Snow Melting ◽  
Freezing And Thawing ◽  
Recycled Asphalt ◽  
Damage Characteristics ◽  
Splitting Strength ◽  
Damage Degree ◽  
Erosion Effect

The erosion effect of snow-melting salt will degrade the durability of recycled asphalt pavement, but the damage characteristics of recycled asphalt mixture triggered by the erosion effect of snow-melting salt remain unclear. To solve the snow-melting salt-induced durability degradation of asphalt pavement, two commonly used snow-melting salts, NaCl and CaCl2, were selected to carry out the saline water immersion, salt-drying and -wetting cyclic and salt-freezing and -thawing cyclic splitting tests on recycled asphalt mixture, and the attenuation laws of splitting strengths and its damage characteristics under the erosion effect of snow-melting salts were analyzed. Results demonstrate that with the increase in soaking time, salt-drying and -wetting cycles and salt-freezing and -thawing cycles, the splitting strength of the recycled asphalt mixture maintain a declining trend, and the attenuation rate of splitting strength is elevated. The damage degree of the recycled asphalt mixture presents a nonlinear growth trend during saline water immersion, salt-drying and -wetting cycles, and salt-freezing and -thawing cycles. Under the same conditions, the damage degree after the action of NaCl solution is higher than that after the action of CaCl2 solution, and meanwhile, within the range of test concentration, the damage degree after the action of low-concentration saline solution is higher than that after the action of high-concentration saline solution. Conclusions provide a significant reference for the composition design and maintenance decisions of recycled asphalt pavement materials in cold regions. Keywords: road engineering; salt erosion; recycled asphalt mixture; damage characteristics; splitting strength

scholarly journals Long-Term Performance of Pavement Structures with Cold In-Place Recycled Base Course

2021 ◽  
Vol 16 (2) ◽  
pp. 48-65
Author(s):  
Audrius Vaitkus ◽  
Judita Gražulytė ◽  
Andrius Baltrušaitis ◽  
Jurgita Židanavičiūtė ◽  
Donatas Čygas
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Pavements ◽  
Recycled Asphalt ◽  
Binding Agents ◽  
Pavement Structure ◽  
Pavement Structures ◽  
Base Course ◽  
Surface Distress ◽  
Foamed Bitumen

Properly designed and maintained asphalt pavements operate for ten to twenty-five years and have to be rehabilitated after that period. Cold in-place recycling has priority over all other rehabilitation methods since it is done without preheating and transportation of reclaimed asphalt pavement. Multiple researches on the performance of cold recycled mixtures have been done; however, it is unclear how the entire pavement structure (cold recycled asphalt pavement overlaid with asphalt mixture) performs depending on binding agents. The main objective of this research was to evaluate the performance of cold in-place recycled asphalt pavements considering binding agents (foamed bitumen in combination with cement or only cement) and figure out which binder leads to the best pavement performance. Three road sections rehabilitated in 2000, 2003, and 2005 were analysed. The performance of the entire pavement structure was evaluated in terms of the International Roughness Index, rut depth, and pavement surface distress in 2013 and 2017.

Laboratory Study on Cold-Mixtures for Asphalt Pavement

2012 ◽  
Vol 178-181 ◽  
pp. 1361-1364
Author(s):  
Shi Bin Ma ◽  
Li Jie Wang ◽  
Guo Qiang Zhang
Keyword(s):  
Laboratory Study ◽  
Asphalt Concrete ◽  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Test Methods ◽  
Recycled Asphalt ◽  
Concrete Mixtures ◽  
Mechanistic Analysis ◽  
Cleavage Strength

The main purpose of recycling is to reuse existing pavement material. First this paper reviews the necessary, feasibility and mechanistic analysis of recycled asphalt mixture, then summarizes the findings of a laboratory study to characterize and design recycled asphalt concrete mixtures using different tests. The laboratory tests carried out on the material were conventional test methods including unconfined compressive strength, cleavage strength, resilient modulus and shrinkage properties tests. The results of the laboratory can be taken as reference in design, engineering and further research．

scholarly journals Durability Evaluation Study for Crumb Rubber–Asphalt Pavement

2019 ◽  
Vol 9 (16) ◽  
pp. 3434 ◽  
Author(s):  
Xuancang Wang ◽  
Zhenyang Fan ◽  
Li Li ◽  
Hongyao Wang ◽  
Minghui Huang
Keyword(s):  
Evaluation System ◽  
Evaluation Method ◽  
Asphalt Pavement ◽  
Water Immersion ◽  
Asphalt Mixture ◽  
Objective Evaluation ◽  
Evaluation Study ◽  
Crumb Rubber ◽  
Working Environment ◽  
Traffic Load

In this study, the failure mechanism of crumb rubber–asphalt pavement was analyzed under the combined effects of low temperature, water, and traffic load. The investigation was carried out based on the mechanical and deformational properties of crumb rubber–asphalt mixture and the typical environmental and load conditions such pavement is typically exposed to. A method was proposed for objective evaluation of the interfacial adhesion between rubber crumbs and asphalt through consideration of the effects of the characteristics of the materials and the working environment. The main evaluation method used herein included the indirect tensile strength test under freeze–thaw–boiling cycle, and the Cántabro abrasion test under water-immersion was adopted as an auxiliary method. The evaluation system has the advantages of simple implementation, realistic simulation of the actual working state of the mixture, and reliable results. Moreover, it is a durability evaluation method that can be specifically applied to asphalt mixtures with some special aggregates or stone mastic asphalt (SMA) mixtures.

scholarly journals The Research on Tests for Detecting Strength of Shallow Asphalt Pavement under Ice Frozen

2012 ◽  
Vol 5 ◽  
pp. 293-298
Author(s):  
Mao Cai Zhao ◽  
Shi Xian Gao ◽  
Da Wei Shi ◽  
Qi Shu Huang
Keyword(s):  
Compression Test ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Guizhou Province ◽  
Uniaxial Compression Test ◽  
Penetration Test ◽  
Freezing And Thawing ◽  
Tensile Splitting Strength ◽  
The Relationship ◽  
Diametral Compression Test

The thesis utilizes the Penetrating Strength Detector of Shallow Pavement to conduct impacting penetration experiment, uniaxial compression test and diametral compression test to asphalt mixture of different void ratios and cycles of freezing and thawing, and then we’ve obtained the relationship between average penetration depth and compressive strength as well as tensile splitting strength of mixture, moreover, the initial reference standard of the Penetrating Strength Detector of Shallow Pavement is established. Afterwards, the thesis conducts impacting penetration test to the asphalt pavement cores from Chongzun freeway in Guizhou Province suffering from ice frozen damage. The effectiveness of the Penetrating Strength Detector of Shallow Pavement has been proved.

scholarly journals Long-Term Performance and Deicing Effect of Sustained-Release Snow Melting Asphalt Mixture

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Jian Zhou ◽  
Jing Li ◽  
Guoqiang Liu ◽  
Tao Yang ◽  
Yongli Zhao
Keyword(s):  
Sustained Release ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Bending Test ◽  
Snow Melting ◽  
Marshall Test ◽  
Mineral Powder ◽  
Long Term Performance ◽  
Term Performance ◽  
Melting Effect

To accelerate snow and ice melting, traditional chloride-based salts are spreaded on asphalt pavement surface, causing serious environmental pollution and infrastructure corrosion. For sustained-release snow melting asphalt mixture, the snow melting agent of Mafilon is directly added to asphalt mixture by replacing partial mineral powder to develop a new type of functional asphalt mixture. In this paper, through the Marshall test, immersion Marshall test, rutting test, trabecular bending test, and Cantabro test, the effects of Mafilon addition on asphalt pavement performance is systematically analysed. Meanwhile, salt precipitation rate is measured by conductimetry to estimate effective deicing period of the pavement. Finally, a new experimental device is designed to quantitatively evaluate snow melting effect of sustained-release snow melting asphalt pavement. The experimental results show that replacing 70% of the mineral powder with Mafilon by volume can achieve satisfactory snow melting effect without affecting usability of asphalt pavement.

Research and Application of Warm Recycled Asphalt Mixture

2012 ◽  
Vol 446-449 ◽  
pp. 2412-2417
Author(s):  
Li Ying Yang ◽  
Yi Qiu Tan ◽  
Hao Liu ◽  
En Guang Li
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Laboratory Research ◽  
Reclaimed Asphalt Pavement ◽  
Recycled Asphalt ◽  
Environment Friendly ◽  
Reclaimed Asphalt ◽  
The World ◽  
Effective Use ◽  
Near Future

Reclaimed asphalt pavement (RAP) develops rapidly throughout the world. Hot recycling is one way to make effective use of the waste, but the percentage of RAP in hot recycling is no more than 30%. By way of warm asphalt technology, the percentage of RAP can increase greatly. In this paper, warm recycling is researched. The RAP and the virgin materials including aggregates and asphalt are tested and analyzed. Then, two warm recycling mixtures with different amount of RAP are designed and their properties are investigated. As a comparison, the performances of hot recycling are also tested. At last, the performances of warm recycling and hot recycling are compared and discussed. After the laboratory research, the warm recycling made its debut in Beijing and it exhibit very well, which testifies that warm recycling owns good properties. Warm recycling can make use of pavement waste, and it can decrease the emission and energy consumption. Warm mix is environment-friendly and it is promising in the near future.

The Durability Analysis of Secondary Recycled Asphalt Mixture

2012 ◽  
Vol 557-559 ◽  
pp. 1497-1500
Author(s):  
Yu Long Liu ◽  
Ning Zhao ◽  
Jin Zhao
Keyword(s):  
Performance Index ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Recycled Asphalt Pavement ◽  
Recycled Asphalt ◽  
Reclaimed Asphalt ◽  
The Road ◽  
Durability Analysis ◽  
Road Performance ◽  
The Right

In order to solve the waste which is generated from the recycled asphalt pavement overhaul again, this paper puts forward the idea of secondary reclaimed asphalt mixture. Through analysis the performance index of secondary reclaimed asphalt mixture and with comparison the road performance of the asphalt mixture after different recycled times,we found that, as long as mixed with the right amount of regenerative agent,the road performance index of secondary recycled asphalt mixture can be recovered to the use standard. However, with the increasing of the asphalt aged times, the declining rate of road performances of reclaimed asphalt mixture are increasing.

Experimental Research of Reclamation Performance of Recycled Asphalt Pavement Material at Weihai Area

2012 ◽  
Vol 204-208 ◽  
pp. 3712-3715
Author(s):  
Ben Hui Gong ◽  
Hong Jie Ji ◽  
Peng Jie Wang
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Agent Technology ◽  
High Temperature Stability ◽  
Recycled Asphalt Pavement ◽  
Recycled Asphalt ◽  
Moisture Susceptibility ◽  
Stability Performance ◽  
Pavement Material

Based on the recycled asphalt pavement material rooted out during road net reconstruction, this paper uses modified rejuvenating agent technology to study the reclamation performance of recycled asphalt pavement material, the mixture is AC-16 designed with new and old asphalt mixture. The results show that modified rejuvenating agent technology can improve the high temperature stability performance, the low temperature crack resistance performance and the moisture susceptibility performance of recycled asphalt pavement material effectively.

Study on Durability of Granulated Crumb Rubber Asphalt Pavement Based on TPS High-Viscosity Asphalt

2014 ◽  
Vol 587-589 ◽  
pp. 985-989 ◽  
Author(s):  
Yong Shou Yang ◽  
Qiang Dong
Keyword(s):  
Asphalt Pavement ◽  
Water Immersion ◽  
Asphalt Mixture ◽  
Crumb Rubber ◽  
High Viscosity ◽  
Water Stability ◽  
Mineral Aggregate ◽  
Modified Asphalt ◽  
Adhesion Ability ◽  
Sbs Modified Asphalt

In order to improve the durability of granulated crumb rubber asphalt pavement, different amount of TPS modifier are added into granulated crumb rubber asphalt mixture to do tests of water-boiling, water immersion, immersing Marshall, cantabro immersion and some other indoor experiments. Through comparing with base asphalt and SBS modified asphalt, we found that the adhesion ability of asphalt and mineral aggregate and crumb rubber were granulated after adding TPS modifier. The water stability of granulated crumb rubber asphalt mixture is improved. The durability of granulated crumb rubber asphalt mixture has also been improved dramatically. In additions, the optimum mixing volume of TPS for granulated crumb rubber asphalt mixture is 12%; the mixing temperature of asphalt mixture is 185°C.

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