Technology of Emulsified Asphalt Cold Recycling Upper Base Used in Expressway Asphalt Pavement Heavy Maintenance

2011 ◽  
Author(s):  
Jiang Tao ◽  
Sun Bin ◽  
Sun Lijun ◽  
Liu Liping
Keyword(s):  
Asphalt Pavement ◽  
Cold Recycling ◽  
Emulsified Asphalt

scholarly journals Performance Evaluation of Recycled Asphalt Pavement Materials and Cold Recycling Mixtures Designed with Vibratory Compaction Method

2019 ◽  
Vol 9 (15) ◽  
pp. 3167
Author(s):  
Yuhui Pi ◽  
Zhe Li ◽  
Yingxing Pi ◽  
Zhe Huang ◽  
Guangcan Li
Keyword(s):  
Performance Evaluation ◽  
Asphalt Pavement ◽  
Heavy Duty ◽  
Recycled Asphalt Pavement ◽  
Recycled Asphalt ◽  
Accelerated Curing ◽  
Vibratory Compaction ◽  
Cold Recycling ◽  
Emulsified Asphalt ◽  
Compaction Method

In this paper, the basic composition and performance evaluation of the recycled asphalt pavement (RAP) materials were firstly analyzed, and two methods were proposed to evaluate strength characteristics of RAP materials, including a triaxial method for the residual strength and the mortar cementing method for the strength of RAP lump. Then, the cold recycling technology was applied on RAP materials with emulsified asphalt by using vibratory compaction and heavy-duty compaction methods (Proctor compaction method), and the results showed that the maximum dry density obtained by heavy-duty compaction was closer to the actual situation. Finally, the effects of wetting water, emulsified asphalt dosage and curing conditions on the performance of the specimens were investigated. It was found that when the emulsified asphalt was mixed uniformly, whether or not to add the wetting water have almost no effect on the strength of the molded specimens. When the matrix asphalt content of the emulsified asphalt was 30%~60%, the water could be directly added to the cold recycling mixture. The intensity of accelerated curing for two days at 40 °C was approximately equal to that of natural curing for three days, while that of accelerated curing for three days at 40 °C was approximately equal to that of natural curing for seven days, which provided a basis for the short-term laboratory test.

Experimental Study on Water Stability of Cold Recycled Mixture Stabilized with Emulsified Asphalt

2012 ◽  
Vol 204-208 ◽  
pp. 1914-1917
Author(s):  
Ming Hui Liu
Keyword(s):  
Asphalt Pavement ◽  
Water Stability ◽  
Experiment Research ◽  
Asphalt Cement ◽  
Freeze Thaw ◽  
Recycling Technology ◽  
Split Test ◽  
Cold Recycling ◽  
Marshall Stability ◽  
Emulsified Asphalt

Abstract: Water damage on asphalt pavement will accelerate pavement destruction, and decrease the service life of highway. Water stability of recycled mixture especially should be strengthened in design and construction of cold-recycled pavement. Taking for cold recycling technology as research object , We studied water stability and freeze-thaw stability of cold recycled mixture stabilized with emulsified asphalt, cement and emulsified asphalt through tests of Marshall stability and immersion Marshall、split test 、soaking split test and freeze-thaw split etc. The results obtained show that: Water stability of Cold recycled mixture stabilized two different additives all can satisfy requirement, and cold recycled mixture adding little cement has better stability. Cold recycled mixture stabilized emulsified asphalt can be used as highway base or sub-surface of pavement. The experiment research results provide a reliable reference for cold recycled mixture design and its applicability.

Analysis of Weighting Coefficients of Post-Assessment Indexes for Cold Recycling Engineering of Asphalt Pavement Based on Hierarchy Analytic Procedure

2012 ◽  
Vol 204-208 ◽  
pp. 1857-1863
Author(s):  
Min Jiang Zhang ◽  
Wen Bo Zhang ◽  
Bao Yang Yu
Keyword(s):  
Asphalt Pavement ◽  
Base Layer ◽  
Environmental Benefit ◽  
Analytic Hierarchy ◽  
Analytic Procedure ◽  
The Road ◽  
Technology Project ◽  
Recycling Technology ◽  
Cold Recycling ◽  
Post Assessment

Based on the theory of hierarchy analysis, the post-assessment indexes system of cold recycling technology project have been established, and the hierarchy analytic procedure have been used to determine the weighing coefficients for post-assessment indexes of cold recycling engineering of asphalt pavement, and the weighing values for various levels factors were given for the cold recycling base layer project of highway of Shenyang-Yingkou. Considering the road performance and economic benefit, societal and environmental benefit, the analytic hierarchy procedure (AHP) method can effectively avoid making wrong decisions subjectively and made it more scientific and reasonable to determine the weighing values of post-assessment indexes, and it is an effective method to determine the weighing values for post-assessment indexes of the cold recycling technology project.

scholarly journals Research and Analysis on the Principle in Plant Cold Recycling for Foamed Bitumen and Mixture Performance

2021 ◽  
Vol 4 (6) ◽  
Author(s):  
Zecheng Ni ◽  
Shijing Chen ◽  
Yihuan Li ◽  
Hongxi Peng ◽  
Jiawen Liang ◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Pavement ◽  
External Factors ◽  
Asphalt Pavements ◽  
Huge Amount ◽  
Construction Waste ◽  
The Road ◽  
Road Performance ◽  
Foamed Bitumen ◽  
Cold Recycling

The early asphalt pavement in our country severely reduced the road performance due to various external factors during the use process. According to incomplete statistics, there are more asphalt pavements that need to be renovated and repaired every year in China, and the amount of construction waste such as asphalt concrete and other construction waste reaches 1,000. About ten thousand tons. If such a huge amount of construction waste is not used, it will inevitably cause great pollution to the environment. If it can be reused, not only will it be environmentally friendly and energy-saving, it will also save more than one billion yuan in costs. In view of the above problems, this article conducts related Research and Analysis on the Principle in Plant Cold Recycling for Foamed Bitumen and Mixture Performance to provide reference for future projects.

scholarly journals Bonding Performance and Evaluation of Basalt Fiber Asphalt Macadam Seal

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Enmao Quan ◽  
Yangsen Cao ◽  
Hongke Xu
Keyword(s):  
Shear Strength ◽  
Asphalt Pavement ◽  
Three Dimensional ◽  
Basalt Fiber ◽  
Strengthening Mechanism ◽  
Economic Benefits ◽  
Bonding Performance ◽  
Pull Out ◽  
Comprehensive Performance ◽  
Emulsified Asphalt

To broaden the application of the basalt fiber in the preventive maintenance of asphalt pavement, this study investigated the bonding performance and evaluated the comprehensive performance of the basalt fiber asphalt macadam seal. Firstly, different types of basalt fiber asphalt macadam seal were prepared. The influences of content and length of the basalt fiber and dosage of emulsified asphalt on the bonding performance of the asphalt macadam seal were analyzed and compared. Next, by using the efficacy coefficient method, comprehensive performance considering both mechanical and economic characteristics of the basalt fiber asphalt macadam seal was evaluated. After that, reasonable content of each material was determined. Finally, the strengthening mechanism of the fiber on the bonding performance of macadam seals was revealed from a microscopic view. The results showed that compared with the ordinary asphalt macadam seal, the loss aggregate rate of the basalt fiber asphalt macadam seal was 11.0–30.5% lower, and the pull-out strength, shear strength, and torsional shear strength were 11.7–16.3%, 9.7–22.4%, and 4.2–20.6% higher, respectively. Considering the bonding performance and economic benefits, the optimal amount of emulsified asphalt and basalt fiber was 1.6 kg/m2 and 70 g/m2, respectively. Basalt fiber increased the cohesion of the asphalt material and improved the bonding performance of asphalt macadam seals through formation of the three-dimensional network structure. This study can provide reference to the application of basalt fibers in asphalt pavement maintenance.

Performance of Emulsified Asphalt Full Thickness Cold Recycling Subgrade Materials

2014 ◽  
Vol 915-916 ◽  
pp. 704-708 ◽  
Author(s):  
Jun Xiao Li ◽  
Xiao Bo Yin ◽  
Jian Yuan ◽  
He Chao Zang ◽  
Zong Rui Hao
Keyword(s):  
Network Structure ◽  
Unconfined Compressive Strength ◽  
Cement Hydration ◽  
Full Thickness ◽  
Hydration Products ◽  
Space Network ◽  
Tightly Coupled ◽  
Indirect Tensile ◽  
Cold Recycling ◽  
Emulsified Asphalt

Full thickness cold recycling subgrade materials were prepared by cement-emulsified asphalt solidified RAP and stabilized soil.The effect of adding amount of emulsified asphalts change on unconfined compressive strength, indirect tensile strength and water stability of cold recycled mixtures with different ratios was studied,and the mechanism of action of cement and emulsified asphalt in the mixtures was analysised via microscopic test. The results show that a proper addition of emulsified asphalt can improve the performance of cold recycled mixtures and the best emulsified asphalt mixing content is 3%. Microscopic test indicate that the cement hydration products space network structure interfinger with the emulsified asphalt network structure, so the cold recycled mixture tightly coupled to a semi-rigid whole, and the mixtures strength can form and develop.

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