Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"International Roughness Index (IRI)"”.
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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
… of the verification study of the Mechanistic-Empirical Pavement Design Guide (M-EPDG) using level 2 and level 3 inputs. In addition, the challenges of verification of the predicted performance with the help of field-measured data of existing flexible pavements are also presented. In this study, …
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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
… through a case study using Mechanistic-Empirical Pavement Design Guide (MEPDG). Permanent deformation or 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 …
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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
… for design purposes by the Mechanistic Empirical Pavements Design Guide (MEPDG). The elastic modulus directly impacts selection of the overall pavement thickness, and an accurate estimation of the modulus is therefore key to a cost-effective pavement design. This thesis researched the …
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Evaluating the Mechanical Properties and Long-Term Performance of Stabilized Full-Depth Reclamation Base Materials
… for design purposes by the Mechanistic Empirical Pavements Design Guide (MEPDG). The elastic modulus directly impacts selection of the overall pavement thickness, and an accurate estimation of the modulus is therefore key to a cost-effective pavement design. This thesis researched 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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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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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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Machine Learning Approaches for Improving Construction Materials and Pavement Systems
… and unsupervised ML models to predict the International Roughness Index (IRI) of concrete pavements from the Long-Term Pavement Performance (LTPP) database. Not unexpectedly, the models concluded that material properties, traffic load, and climate conditions were crucial to IRI prediction. …
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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 …