Browsing by Author "Barnes, Randal J."
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Item Effects of Seasonal Changes on Ride Quality at MnROAD(Minnesota Department of Transportation, 2008-07) Khazanovich, Lev; Bly, Peter; Shamin, Atika; Barnes, Randal J.This project studied frost heave as it relates to different pavement design parameters and ride quality deterioration. Elevations of frost pins embedded in MnROAD test sections were measured over four years. Pin elevation changes were analyzed to show the amount of frost heave and degree of frost heave uniformity within a cell. Various plots were made to show the elevation change and interquartile range of the pins over time. Statistical approaches such as visual analyses, Student-t hypothesis testing, and ANOVA analysis were used in this study to evaluate the effect of pavement design features on frost heave and roughness. Subgrade and base type, pavement thickness, and drainage capabilities are the major design factors that affect frost heave. The effects of frost heave on ride quality deterioration for flexible and rigid pavements could not be confirmed or statistically rejected in this study. No seasonal adjustment factor for IRI measurement is recommended for use in a pavement management system because no firm conclusions could be made from the data concerning a seasonal effect on IRI measurements.Item Geostatistics for Subgrade Characterization(1993-10) Barnes, Randal J.Subgrade modulus values for roads around the State of Minnesota can be effectively modelled as spatially correlated lognormal random variables. Based upon this geostatistical model, this report presents guidelines and nomographs for selecting the preliminary sample spacing for assessing the subgrade modulus. The maximum sample spacing to achieve a required precision is represented as a function of the average, standard deviation, and correlation length.Item MnROAD Data Mining, Evaluation and Quantification – Phase I(Minnesota Department of Transportation Research Services Section, 2010-07) Barnes, Randal J.A data filtering system for the MnROAD temperature database was designed and implemented. Fourteen inter-dependent quantitative tests were developed to identify and flag erroneous, questionable, or exceptional data. Four of the tests identify missing and intermittent data streams. Three of the tests analyze the time series from individual sensors and identify outliers. Three of the tests compare data streams of similar sensors; “similar” implies identical pavement type, general location, and sensor depth. The remaining four tests are summary tests that identify periods of unreliable data. The specific analysis and quantitative results are based upon the 471,178,324 data records from 1,313 thermocouple sensors in 48 MnROAD test cells collected from 1 January 1996 through October 2007. The considered test cells include both hot mix asphalt and Portland cement concrete sections from both the Mainline and Low Volume Road. The majority of the sensors performed very well: 714 of the 1,282 operational sensors produced reliable data more than 99 percent of the time. Only 18 of 1,282 operational sensors produce reliable data less than 50 percent of the time. Only 31 of the original 1,313 sensor were wholly non-operational. A wide variety of statistical tables and graphical representation were produced in a digital format for the considered data. Although this project focuses on a particular set of data, the concepts and tools developed in this project are designed to be extensible to accommodate the filtering of the ongoing and future data collection efforts at MnROAD.Item Statewide Statistical Subgrade Characterization(Minnesota Department of Transportation, 1995-06) Barnes, Randal J.; Jankovic, Igor; Colom, DavidThis report presents a detailed statistical analysis and graphical presentation of more than 120,000 subgrade modulus values from Minnesota state roads and highways. These subgrade modulus values are based on Falling Weight Deflectometer measurements collected by the Minnesota Department of Transportation between 1983 and 1993. The report gives a one-page summary for each road in each district where measurements exist. This summary page contains a plot of the modulus versus the reference post, modulus versus year when a measurement is collected, modulus histogram, and a number of state-wide summaries. The one-page summaries are accompanied by a number of district and state-wide summaries, and nomograms for the selection of sample spacing, to form the state of Minnesota subgrade modulus Atlas. In addition to this report, a Microsoft Windows-based computer program, the Minnesota Subgrade Modulus Atlas--Online, allows for the detailed analysis of the subgrade modulus along state roads and highways. This analysis can be carried out on a state-wide scale, on a small project scale of less than one mile, or any scale in between. "This electronic form of the Atlas can be easily upgraded as additional measurements become available.Item Statistical Analysis of the Sources of Flexible Pavement Variability(Minnesota Department of Transportation, 1999-02) Barnes, Randal J.; Jankovic, Igor; Froment, ArnaudThis research project attempts to identify, quantify, and statistically characterize the components of asphalt pavements that may lead to spatial variability of pavement performance. This assessment is based upon the extensive data sets collected at the MnROAD project. The physical site characterization is carried out using data collected by falling weight deflectometer, ground penetrating radar, and physical core specimens. The applied load information is inferred from the data collected by the state-of-the-art weigh-in-motion system in operation at the MnROAD site. The pavement performance is characterized by international roughness index data, crack count data, and rutting depth data.