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.

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.

Study of highway asphalt pavement recycling maintenance scheme decision system and decision method

2021 ◽  
pp. 1-10
Author(s):  
Hongjun Jing ◽  
Ping Yao ◽  
Lichen Song ◽  
Jiahao Zhang ◽  
Yanlong Zhao ◽  
...  
Keyword(s):  
Decision Making ◽  
Evaluation System ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Asphalt Pavement ◽  
Economic Benefits ◽  
Highway Maintenance ◽  
Decision System ◽  
Recovery Index ◽  
Pavement Recycling

With modern economic and social development, the technical and economic requirements of highway maintenance and construction projects have become increasingly complicated. Meticulous and in-depth investigation and demonstration guided by scientific theories and methods are of considerable importance to highway maintenance scheme decision. As basis for the selection of highway asphalt pavement recycling maintenance scheme, the factors influencing the decision are analytically demonstrated and an evaluation system is proposed, including three major decision indexes: applicability of recycling mode, recycled pavement quality recovery index, and economic benefit. According to the principles of data statistics and analysis, this study proposes a calculation method for the recycled pavement quality recovery index, analyzes the economic benefits of decision schemes using economic models such as recycling ratio and cost, and puts forward an optimal evaluation method of engineering cost and its fuzzy score intervals. Index weights are calculated through the analytic hierarchy process, and the comprehensive decision evaluation system and comprehensive evaluation method are established. Subsequently, the decision-making method is analyzed on the basis of the decision system by combining the related data. Results show maximum weight of the pavement quality recovery index and minor differences among four recycling schemes in the quality recovery index and applicability. The decision-making results are simplified with clear hierarchical feature because of the fuzzy score intervals of each index. Findings can provide a reference for the asphalt pavement recycling scheme decision.

Evaluation on High Temperature Performance of Asphalt Mixture by Triaxial Dynamic Compression Test

2011 ◽  
Vol 97-98 ◽  
pp. 130-137
Author(s):  
Chuan Hai Wu
Keyword(s):  
High Temperature ◽  
Compression Test ◽  
Evaluation Method ◽  
Dynamic Compression ◽  
Testing Machine ◽  
Asphalt Mixture ◽  
Objective Evaluation ◽  
Road Pavement ◽  
Temperature Performance ◽  
Accumulated Strain

This paper aims to explore the reasonability of an evaluation method on high temperature performance of asphalt mixture through a series of experiements. The first step of these experiements is to formulate specimens of different high-temperature performances by Gyratory Testing Machine which simulates the on-road pavement to the most extent , and then adopt triaxial dynamic compression test to compare and analyze high-temperature performances of these specimens. By introducing concepts and indicators such as validity, reliability, discrimination, this paper evaluates comprehensively the discrimination results of various compression test parameters on high-temperature performance of asphalt mixture. It concludes that the evaluation effect of compression stiffness modulus is best, followed by the slope of logarithmic creep curve and accumulated strain area, and the evaluation effect of final compression strain is comparatively poor. That provides an objective evaluation method on high temperature performances of asphalt mixtures.

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 A New Objective Evaluation Method on Image Edge Detection

2021 ◽  
Author(s):  
Jingshi Chen ◽  
Gang Liu ◽  
Feng Liu ◽  
Ying Wang ◽  
Yongxing Sun ◽  
...  
Keyword(s):  
Edge Detection ◽  
Evaluation System ◽  
Evaluation Method ◽  
Subjective Evaluation ◽  
Evaluation Criteria ◽  
Objective Evaluation ◽  
Evaluation Indexes ◽  
Image Edge Detection ◽  
Image Edge ◽  
Basic Evaluation

Abstract In the field of machine vision, image edge detection is an important technology, which can make necessary preparation for the later image processing. Consequently, accurate evaluation of the edge detection effect of the processed image is a more critical technology. In this paper, the new three criteria are proposed, which is based on Canny's three criteria for edge detection. Through theoretical analysis, three quantitative basic evaluation indexes are given to the new three criteria, namely SSIM index of image reconstruction similarity, BIdx index of edge reliability and CIdx index of edge continuity. Additionally, noise evaluation criteria is also considered. Then the four basic evaluation indexes are fused to get the objective evaluation index EIdx of image edge detection.Finally, the experimental data show that the accuracy of the method is better than that of the subjective evaluation system.

scholarly journals Laboratory and Field Investigation of the Feasibility of Crumb Rubber Waste Application to Improve the Flexibility of Anti-Rutting Performance of Asphalt Pavement

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1738 ◽  
Author(s):  
Hongyin Li ◽  
Hailong Jiang ◽  
Wenwu Zhang ◽  
Peng Liu ◽  
Shanshan Wang ◽  
...  
Keyword(s):  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Crumb Rubber ◽  
Field Investigation ◽  
Compression Tests ◽  
Modified Asphalt ◽  
Asphalt Mix ◽  
Low Temperature Cracking ◽  
Indirect Tensile

Resistance of asphalt mix to low-temperature cracking and rutting at high temperature is very important to ensure the service performance of asphalt pavement under seasonal changes in temperature and loading. However, it is challenging to balance the improvement of such resistance by using additives, e.g., anti-rutting agent (ARA). This study focuses on improving the flexibility of anti-rutting asphalt mix by incorporating crumb rubber (CR) and ARA. The properties of the prepared modified asphalt mix were evaluated in the laboratory by performing wheel tracking, three-point bending, indirect tensile, and uniaxial compression tests. The experimental results showed that the dynamic stability of modified asphalt mix was significantly increased due to the addition of ARA and further improved by incorporating CR. The maximum bending strain at −10 °C was increased due to the contribution of CR. The results of indirect tensile strength and resilient modulus further indicated that the CR-modified anti-rutting mixture was more flexible. Moreover, the field observation and evaluation indicated that the CR-modified anti-rutting asphalt pavement met the standard requirements, better than normal asphalt mixture in many parameters. A conclusion can be made that incorporating CR in asphalt mixture prepared with ARA can improve pavement performance at both high and low in-service temperatures.

Study on Quality Evaluation System for Arterial Highways Based on Fuzzy Comprehensive Evaluation

2013 ◽  
Vol 438-439 ◽  
pp. 1952-1957
Author(s):  
Jie Li ◽  
Shao Wei Yang
Keyword(s):  
Evaluation System ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Objective Evaluation ◽  
Evaluation Index System ◽  
Analytic Hierarchy ◽  
Expert Evaluation Method ◽  
Set Up ◽  
Quality Evaluation System

In this paper, the preliminary study of fuzzy comprehensive evaluation for arterial highway is made, the multi-level evaluation index system is set up, the process and formula of fuzzy comprehensive evaluation are proposed, and the practical application is explained by examples. To evaluate the highway engineering feasibility study, some methods are applied such as fuzzy comprehensive evaluation, analytic hierarchy process, expert evaluation method, etc. Thus it provides objective evaluation for the related management department to achieve the goal of improve the quality of highway preliminary work.

Nonlinear Finite Element Research for the Rutting of Asphalt Pavement Base on Shear Stress Analysis

2011 ◽  
Vol 97-98 ◽  
pp. 91-94
Author(s):  
Yi Dong ◽  
Miao Juan Peng ◽  
Yong Qi Ma ◽  
Wei Feng
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Stress Analysis ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Middle Layer ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Traffic Load ◽  
Pavement Base

In this paper, visco-elastic-plasticity theory is employed to establish a nonlinear finite element model of the asphalt mixture pavement. The influence of pavement structure, the ability of rutting resistance of middle layer and traffic load on shear stress distribution for asphalt pavement are discussed. The numerical results show that shear stress analysis can be used to analyze the rutting of asphalt pavement. The asphalt materials of middle layer have a great impact on rutting and shear stress. Modified asphalt is a useful middle layer material to decrease the rutting, and the hard asphalt is also an economical material to reduce rutting. Overload and overpressure easily cause pavement rutting damage. Pavement longitudinal grade is not the main reason leading to rutting at the long slope, but brake frequently in the long slope is the real cause of rutting.

Laboratory characterization of recycled crumb-rubber-modified asphalt mixture after extended aging

2008 ◽  
Vol 35 (11) ◽  
pp. 1308-1317 ◽  
Author(s):  
Soon-Jae Lee ◽  
Hakseo Kim ◽  
Chandra K. Akisetty ◽  
Serji N. Amirkhanian
Keyword(s):  
Tensile Strength ◽  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Accelerated Aging ◽  
Crumb Rubber ◽  
Moisture Susceptibility ◽  
Testing Procedures ◽  
Laboratory Characterization ◽  
Significant Difference

This paper presents a limited study that characterizes the recycling of artificially aged crumb-rubber modified (CRM) mixtures depending on their recycling percentage and aggregate type. Eight mixtures [six recycled mixtures containing rubberized reclaimed asphalt pavement (RAP) and two control virgin mixtures] were designed and tested. Two types of aggregates were used in this research project. The rubberized RAP used in the study was artificially aged in the laboratory using an accelerated aging processes. The percentages of the RAP, by total weight of the mix, incorporated into the recycled mixtures were 15%, 25%, and 35%. Evaluation of all mixtures included the following testing procedures: tensile strength ratio (TSR), asphalt pavement analyzer (APA), resilient modulus, and indirect tensile strength (ITS) after long-term oven aging. The results from this study showed that (i) the recycled aged CRM mixtures (with 15%, 25%, and 35% rubberized RAP) can satisfy the current Superpave mixture requirements, including moisture susceptibility and rutting resistance, and (ii) in general, there was no significant difference between the control and the recycled CRM mixtures for the properties evaluated in this study.

Research on the Improving of Warm Mix Asphalt Technology by Adding Organic Viscosity-Reducers

2014 ◽  
Vol 1079-1080 ◽  
pp. 118-123
Author(s):  
Ting Li ◽  
Yan Ping Yin ◽  
Li Ning Gao ◽  
Hua Xin Chen
Keyword(s):  
Performance Evaluation ◽  
Low Temperature ◽  
Evaluation System ◽  
Evaluation Method ◽  
Asphalt Mixture ◽  
Temperature Deformation ◽  
Polymer Grafting ◽  
Stability Evaluation ◽  
Performance Evaluation System ◽  
Poor Adhesion

Inconsideration of the application defects of organic viscosity-reducing warm mixasphalt (represented by Sasobit), such as poor adhesion with aggregate,inadequate of low-temperature deformation, four methods for Sasobit modificationwere proposed and they were blending with polymer, grafting, hydroisomerizationand adjusting molecular weightdistribution width,then the feasibility of each method was analyzed. Moreover, given that performance evaluation of warm mix asphaltmixture still referenced for that of hot mix asphalt mixture, adhesion (water stability) evaluation method based on surface free energy and low temperature performanceevaluation method based on glass transition temperature were put forward to optimize the performance evaluation system of warm mix asphaltmixture.

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