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Showing 1 to 20 of 21 for “"International Roughness Index"”.
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Desarrollo de metodología para la medición de IRI (International Roughness Index), mediante el uso de un rugosímetro basado en el MERLIN (Machine Evaluating Roughness Using Low Cost Instrumentation), para evaluación de pavimentos flexibles y rígidos en El Salvador
El trabajo consiste en el desarrollo de una metodología junto a su equipo para medir el IRI en los pavimentos, comprende su fundamento teórico basado en el MERLIN, también posee el diseño del nuevo equipo, las pruebas realizadas, el desarrollo de la aplicación para obtener IRI a partir de los datos …
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Verification of asphalt concrete performance prediction using level 2 and level 3 inputs of mechanistic-empirical pavement design guide for flexible pavements of the state of New Jersey
… longitudinal cracking, thermal cracking and International Roughness Index (IRI) were verified for the state of New Jersey. The material properties of older (> 5 years) existing pavement layers were not readily available, which made the analysis challenging. In addition, discrepancies between …
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Error Mitigation in Roughness Measurements
Road roughness is an important factor in determining the quality of a stretch of road. The International Roughness Index, a specific measure of road roughness, is widely used metric. However, in order to measure roughness, an accurate road profile must exist. To measure the roads, terrain profiling …
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Performance of the Crack, Seat, and Overlay Rehabilitation Technique for Concrete Pavements in California
… transverse cracking, longitudinal cracking, and International Roughness Index (IRI). And independent (explanatory) variables: age, traffic in the form of equivalent single axle load (ESAL), thickness of hot mix asphalt (HMA), thickness of Portland Cement Concrete (PCC), and cumulative traffic in …
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Effect of Pavement Condition on Traffic Crash Frequency and Severity in Virginia
… the effect of different characteristics such as International Roughness Index (IRI), Rutting Depth (RD), Annual Average Daily Traffic (AADT), this thesis analyzed the effect of Critical Condition Index (CCI) on crash frequency, in addition to the other factors identified in previous studies. …
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Developing pavement preservation and mitigation strategies using Pavement ME design guide for Rhode Island DOT
… preservation strategies using Pavement ME. The International Roughness Index (IRI), Longitudinal Cracking, and Permanent Deformation (Rutting) in both the asphalt layer and the total structure were predicted using Pavement ME to determine the sensitivity of flexible pavement performance with …
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Pavement Surface Characteristics Evaluation Using Vehicle-Based Data Collection
… where CV technology was examined to measure roughness, friction, and pothole data. Data collection was performed by a specialized company, utilizing sensor data from standard manufactured cars. A sample of data from the Richmond district of Virginia, was used to compare the estimated values …
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A Discrete Roughness Index for Longitudinal Road Profiles
… vehicles, pavement, and tires must assess the roughness of a terrain surface for the design of their products. The International Roughness Index (IRI), a standardized means of assessing longitudinal road roughness, quantifies roughness based on the average suspension travel for a particular …
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Evaluation of subgrade strength and flexible pavement designs for reliability
… rutting is very sensitive to subgrade strength. International roughness index (IRI) is sensitive to the subgrade strength. Six existing pavement sections' design data are studied to examine the effect of variability associated with subgrade strength and selection criteria of subgrade strength for …
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Evaluation of the performance of polyurethane foams in rigid pavement preservation
… and analyzing (ProVAL) software to compute the international roughness index (IRI) and the transverse joint faulting. Results show that application of HDP foams did neither improve nor retrogress the pavement condition but maintained it in its state before application of the material. This study …
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Use of smartphones to measure pavement roughness across multiple vehicle types at different speeds
Measuring pavement roughness has been an important practice for transportation agencies for many years now. Commonly, this measurement is recorded as International Roughness Index (IRI) and is collected via a data collection vehicle (DCV) using a combination of lasers, accelerometers, and a …
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Evaluating the Mechanical Properties and Long-Term Performance of Stabilized Full-Depth Reclamation Base Materials
… the foamed asphalt and emulsion sections. The International Roughness Index (IRI) was better for the cement stabilized sections compared asphalt stabilized sections. The Critical Condition Index (CCI) was similar for all treatments at the end of the evaluation period. The durability of the …
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Evaluating the Mechanical Properties and Long-Term Performance of Stabilized Full-Depth Reclamation Base Materials
… the foamed asphalt and emulsion sections. The International Roughness Index (IRI) was better for the cement stabilized sections compared asphalt stabilized sections. The Critical Condition Index (CCI) was similar for all treatments at the end of the evaluation period. The durability of the …
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Performance Measurement Using IRI and Collision Rates in the Province of Alberta
… the reliability and performance of roads. The International Roughness Index (IRI) is a widely used performance measure in Canada and Internationally. It is calculated from direct profile measurement of the pavement wheel paths and translated into metres per kilometre. In 1999, the Province of …
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Cracking and Roughness of Asphalt Pavements Constructed Using Cement-Treated Base Materials
… Cracking may then cause increased pavement roughness and lead to poor ride quality. The overall purpose of this research was to utilize data collected through the Long-Term Pavement Performance (LTPP) program to investigate the use and classification of CTB layers and evaluate the relative …
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Road Profiler Performance Evaluation and Accuracy Criteria Analysis
… the experiment to compare the profiles and International Roughness Index (IRI) measured by each type of equipment with each other and with the reference. These comparisons allowed determination of the accuracy and repeatability capabilities of the existing equipment, evaluation of the …
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Development of a smartphone application to measure pavement roughness and to identify surface irregularities
Pavement roughness is an expression of the unevenness or disturbance in a pavement surface that adversely affects the ride quality of a vehicle. Roughness also affects user delay costs, fuel consumption, tire, and maintenance costs. Roughness is predominantly characterized in terms of International …
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Balanced asphalt mix design and pavement distress predictive models based on machine learning
… distress, such as rutting, cracking, IRI (international roughness index), etc., is still the trend of future asphalt mix design. The service life of asphalt pavement mainly depends on the properties of the asphalt mixture. Whether asphalt mixture has good properties also depends on advanced …
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Laboratory characterization and field performance of hot in-place recycled mixtures
… Deflectometer (FWD), profiling for predicting International Roughness Index (IRI) and Condition Rating Survey (CRS). FWD was conducted at every 61 m for the evaluation of pavement structural capacity of existing pavement, post-HIR and post-overlay conditions. Smoothness measurements for …
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Identification and Characterization of Damaging Road Events
In the field of vehicle durability, many individuals are focusing on methods for better replicating the durability a user will experience throughout the typical design lifespan of a vehicle (e.g., 100,000 miles). To estimate user durability a means of understand the types of damaging events and …
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