scholarly journals Pavement Evaluation Strategies and Ways to Improve the Performance of Asphalt Overlays

2021 ◽  
Author(s):  
Sohail Afzal
Keyword(s):  
Life Cycle Cost ◽  
Field Investigation ◽  
Experimental Program ◽  
Volumetric Properties ◽  
Pavement Condition ◽  
Condition Rating ◽  
Selection Strategies ◽  
Evaluation Strategies ◽  
Pavement Evaluation ◽  
Asphalt Overlays

Highway rehabilitation is a blooming industry in the world and in particular North America. Highway agencies over the years have experienced problems in addressing pavement deteriorations, troubles with underlying pavement materials and management and evaluation of the existing pavements. This study has two objectives. The first objective is to discuss the types of distresses in both flexible and rigid pavements, pavement evaluation methods and equipment in use, pavement condition rating system, process of field investigation, life cycle cost analysis, and pavement selection strategies. A case study of Highway 401 eastbound collector lanes (from Avenue Road to Highway 404) was carried out to demonstrate the process of pavement evaluation and design. The second objective is to undergo an experimental program to evaluate the potential use of shingle waste into Superpave 19.0 and 12.5 asphalt mixes. The evaluation of volumetric properties of the mixes was performed. The trials demonstrated that volumetric properties of the mixes can be achieved at a lower asphalt content. Performance of mixes containing shingles was evaluated through various Highway agencies proved that incorporation of shingles enhances the performance of HMA mixes by improving durability, and increasing rutting resistance, while achieving comparable fatigue resistance.

scholarly journals Pavement Evaluation Strategies and Ways to Improve the Performance of Asphalt Overlays

2021 ◽  
Author(s):  
Sohail Afzal
Keyword(s):  
Life Cycle Cost ◽  
Field Investigation ◽  
Experimental Program ◽  
Volumetric Properties ◽  
Pavement Condition ◽  
Condition Rating ◽  
Selection Strategies ◽  
Evaluation Strategies ◽  
Pavement Evaluation ◽  
Asphalt Overlays

Highway rehabilitation is a blooming industry in the world and in particular North America. Highway agencies over the years have experienced problems in addressing pavement deteriorations, troubles with underlying pavement materials and management and evaluation of the existing pavements. This study has two objectives. The first objective is to discuss the types of distresses in both flexible and rigid pavements, pavement evaluation methods and equipment in use, pavement condition rating system, process of field investigation, life cycle cost analysis, and pavement selection strategies. A case study of Highway 401 eastbound collector lanes (from Avenue Road to Highway 404) was carried out to demonstrate the process of pavement evaluation and design. The second objective is to undergo an experimental program to evaluate the potential use of shingle waste into Superpave 19.0 and 12.5 asphalt mixes. The evaluation of volumetric properties of the mixes was performed. The trials demonstrated that volumetric properties of the mixes can be achieved at a lower asphalt content. Performance of mixes containing shingles was evaluated through various Highway agencies proved that incorporation of shingles enhances the performance of HMA mixes by improving durability, and increasing rutting resistance, while achieving comparable fatigue resistance.

A modified pavement condition rating index for flexible pavement evaluation in Egypt

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
E. M. Ibrahim ◽  
S. M. El-Badawy ◽  
M. H. Ibrahim ◽  
Emad Elbeltagi
Keyword(s):  
Flexible Pavement ◽  
Pavement Condition ◽  
Condition Rating ◽  
Pavement Evaluation

Network Pavement Evaluation with Falling-Weight Deflectometer and Ground-Penetrating Radar

2003 ◽  
Vol 1860 (1) ◽  
pp. 90-99 ◽  
Author(s):  
A. Samy Noureldin ◽  
Karen Zhu ◽  
Shuo Li ◽  
Dwayne Harris
Keyword(s):  
Data Collection ◽  
Ground Penetrating Radar ◽  
Pavement Management ◽  
Falling Weight Deflectometer ◽  
Pavement Condition ◽  
Condition Rating ◽  
Structural Capacity ◽  
Pavement Evaluation ◽  
Ground Penetrating ◽  
Falling Weight

Nondestructive testing has become an integral part of pavement evaluation and rehabilitation strategies in recent years. Pavement evaluation employing the falling-weight deflectometer (FWD) and ground-penetrating radar (GPR) can provide valuable information about pavement performance characteristics and be a very useful tool for project prioritization purposes and estimation of a construction budget at the network level. Traditional obstacles to the use of the FWD and GPR in pavement evaluation at the network level used to be expenses involved in data collection, limited resources, and lack of simplified analysis procedures. Indiana experience in pavement evaluation with the FWD and the GPR at the network level is presented. A network-level FWD and GPR testing program was implemented as a part of a study to overcome those traditional obstacles. Periodic generation of necessary data will be useful in determining how best to quantify structural capacity and estimate annual construction budgets. Three FWD tests per mile on 2,200 lane-mi of the network is recommended annually for network-level pavement evaluation. The information collected will allow the equivalent of 100% coverage of the whole network in 5 years. GPR data are recommended to be collected once every 5 years (if another thickness inventory is needed) after the successful network thickness inventory conducted in this study. GPR data collection is also recommended at the project level and for special projects. Both FWD and GPR data are recommended to be used as part of the pavement management system, together with automated collection of data such as international roughness index, pavement condition rating, rut depth, pavement quality index, and skid resistance.

Adequate data collection frequency and gauging length for surface condition rating in Alberta

2001 ◽  
Vol 28 (5) ◽  
pp. 871-874
Author(s):  
Ashraf El-Assaly ◽  
Simaan AbouRizk ◽  
Jane Stoeck
Keyword(s):  
Data Collection ◽  
Surface Condition ◽  
Pavement Condition ◽  
Condition Rating ◽  
Deterioration Rate ◽  
Pavement Evaluation ◽  
Pavement Deterioration ◽  
Transportation Departments ◽  
Data Collection Procedure ◽  
Adequate Data

In order to ensure safe and comfortable riding, increase network serviceability, and slow pavement deterioration rate, two different strategies are being used simultaneously by transportation departments: routine maintenance and major rehabilitation. Within Alberta Infrastructure, the decision between these alternatives is made based on the pavement condition. Data are collected frequently for the purpose of pavement evaluation. Experienced engineers and technicians normally decide the most appropriate data collection procedure and gauging length associated with it.Key words: pavement, data collection, evaluation, gauging length, condition rating.

scholarly journals Life-Cycle Break-Even Analysis of Electric Carsharing: A Comparative Study in China

2020 ◽  
Vol 12 (16) ◽  
pp. 6584
Author(s):  
Jingjing Jia ◽  
Shujie Ma ◽  
Yixi Xue ◽  
Deyang Kong
Keyword(s):  
Sensitivity Analysis ◽  
Life Cycle ◽  
Life Cycle Cost ◽  
Net Present Value ◽  
Market Price ◽  
Critical Factor ◽  
Field Investigation ◽  
Related Factors ◽  
Business To Consumer ◽  
Influential Variable

Electric carsharing (ECS) is a potential option to address the problem of unsustainability in the transportation sector. The business-to-consumer model of ECS, which is one of several different electric carsharing models, has gained much popularity in recent years. Generating sufficient revenue to cover costs is a critical factor for ECS companies to maintain healthy development. This study makes an economic analysis, on the basis of life-cycle cost and monetary revenue associated with the operation of ECS, of two Chinese ECS companies: EVCARD and LCCS. Based on data gathered by field investigation, this study aims to determine the break-even moment for each company’s main vehicle models by means of the net present value method. The results show that EVCARD achieved an earlier break-even moment than LCCS. The break-even moment of Chery eQ of EVCARD was the shortest of all the vehicle models, at only 181.3 min. Moreover, a sensitivity analysis was conducted to portray how different cost-related and revenue-related factors influence the break-even moment. Our findings indicate that a wide difference exists in terms of the influence of different factors on the break-even moment. Among these, the manufacturer’s suggested retail price is the most influential variable, followed by the unit rental price. The reaction of the break-even moment to the market price of a charging pile and the non-rental revenue per vehicle—especially the latter—was found to be negligible in the sensitivity analysis.

Algorithm for Determining Weight Factors of Pavement Distress Index

1997 ◽  
Vol 1592 (1) ◽  
pp. 63-69
Author(s):  
Chia-Pei Chou ◽  
Chien-Yen Chang
Keyword(s):  
Longitudinal Crack ◽  
Subjective Rating ◽  
Weight Factor ◽  
Severity Factor ◽  
Pavement Condition ◽  
Pavement Distress ◽  
Pavement Evaluation ◽  
Analytical Algorithm ◽  
Pavement Damage

Distress is one of the primary measurements of pavement condition. Thus, in a pavement evaluation program, distress type, severity, and extent should be properly identified. A pavement distress index (PDI) may be calculated by mathematically combining the effects of distresses on pavement conditions. Before the calculation of PDI, each distress attribute must be assigned a weight factor and a severity factor. An analytical algorithm that converts the subjective rating values of distress attributes to a rational weighting scale that provides quantified measurements of the effects of each distress on pavement damage and riding quality is presented. A case study for applying this procedure to the pavements of roadway samples from the Highway Bureau and the National Freeway Bureau in Taiwan also is presented. Through the analysis procedure, it was found that pothole has the largest weight factor (100) and that longitudinal crack has the lowest (49). The severity factors vary from 0.24 to 1.00, depending on the distress type and severity level.

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