WorldCat Identities

Louisiana Transportation Research Center

Works: 364 works in 576 publications in 1 language and 4,121 library holdings
Classifications: TE716.L8, 625.734
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Most widely held works about Louisiana Transportation Research Center
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Most widely held works by Louisiana Transportation Research Center
Identification and stabilization methods for problematic silt soils by Kenneth L McManis( Book )
3 editions published between 2002 and 2003 in English and held by 36 WorldCat member libraries worldwide
Many areas of Louisiana consist of soils with high silt contents, low strengths, and minimal bearing capacity. Construction traffic in these soils can cause detrimental pumping action in areas with a high water table. These wet subgrades under Louisiana pavements cause both construction and performance problems. Common solutions to the problem include excavation and replacement, lime treatment, or cement stabilization. Special provisions are often included in the contract for chemical additives in lieu of undercutting. The research emphasis of this study was placed on efforts to refine the pumping problem and on the development of guidelines for identifying the problem silt-soils. Secondary importance was given to the identification of alternate methods for stabilization. The study consisted of two phases. Phase 1 documented the field experiences of the Louisiana Department of Transportation and Development (DOTD) districts. Phase 2 consisted of a testing program to investigate the nature of the problem, the character of the silt materials, and their performance with modifying and stabilizing agents
Fatigue and shear behavior of HPC bulb-tee girders by Robert N Bruce( Book )
3 editions published between 2003 and 2008 in English and held by 36 WorldCat member libraries worldwide
Three 96-ft (29.3-m) long, 72-in. (1.83-m) deep, precast, pretensioned bulb-tee girders were tested to evaluate behavior under flexural fatigue and static shear loadings. The three girders had a design concrete compressive strength of 10,000 psi (69.0 MPa) and incorporated 0.6-in. (15.2-mm) diameter, Grade 270, low relaxation prestressing strands. The shear reinforcement quantities at the ends of each girder were selected to evaluate the applicability of the shear strength design provisions of the AASHTO Standard Specifications for Highway Bridges and the AASHTO LRFD Bridge Design Specifications. Shear reinforcement consisted of conventional bars or deformed welded wire reinforcement. The three prestressed concrete girders were produced in a commercial plant. Prior to testing, a 10-ft (3.05-m) wide reinforced concrete deck slab was added to each girder. After completion of fatigue testing, each girder was cut in half and the six girder ends tested to evaluate static shear strength
Implementation of high performance concrete in Louisiana bridges by Robert N Bruce( Book )
3 editions published between 1998 and 2001 in English and held by 33 WorldCat member libraries worldwide
The report contains a research plan to assist in the implementation of high performance concrete in the Charenton Canal Bridge in Louisiana. The research involves a literature review, plan review, development of a quality control program for the concrete mixes, development of an instrumentation plan, installation of instrumentation, data collection, analyses of data and development of recommendations
Evaluation of the effect of synthetic fibers and nonwoven geotextile reinforcement on the stability of heavy clay embankments by Zhongjie Zhang( Book )
3 editions published in 2003 in English and held by 28 WorldCat member libraries worldwide
This study evaluates two methods for repairing slope surface failures of clayey soil embankments. One method involves reinforcing the cohesive soils with randomly oriented synthetic fibers; the other method incorporates nonwoven geotextiles. The performance of soils reinforced using these two methods was studied in the laboratory and in the field
Annual report by Louisiana Transportation Research Center( )
in English and held by 28 WorldCat member libraries worldwide
Analysis of Louisiana vehicular input data for MOBILE 6 by Chester G Wilmot( Book )
4 editions published in 2008 in English and held by 27 WorldCat member libraries worldwide
The purpose of this study was to identify sources of data for MOBILE 6 and set procedures to prepare the data in the format required for use in MOBILE 6. The Environmental Protection Agency (EPA) has provided a comprehensive set of documents describing proper use of MOBILE 6 and has also provided a full set of default values to assist in operation of the model. However, the EPA warns that local data should be used wherever possible, and efforts were made in this study to develop procedures that allow local data to be gathered for use in MOBILE 6. A proof-of-concept study was conducted on the use of Global Positioning System (GPS) instruments to estimate vehicle miles traveled (VMT) and soak times. From data of GPS-equipped vehicles in Lexington, Kentucky, gathering information on VMT and soak times in this manner appears to be feasible, and the results showed that local data is sometimes considerably different from that portrayed in MOBILE 6 default tables. Another method of local data collection tested in this study was a method used to estimate VMT from Highway Performance Monitoring System (HPMS) data without using volume groups. Volume groups are difficult to assign to links where no traffic count data exist. The method produces less accurate results than the current method (root mean square error of 1643 vehicles per day overall, versus 543 in the conventional method), but once established, it is easier to apply
Alternative methods to trench backfill by Zhongjie Zhang( Book )
1 edition published in 2005 in English and held by 26 WorldCat member libraries worldwide
Simulating household travel survey data in metropolitan areas by Peter R Stopher( Book )
2 editions published in 2003 in English and held by 25 WorldCat member libraries worldwide
Census data provide a rich range of socioeconomic characteristics from which it is shown that trip characteristics can be simulated. This report summarizes research into the simulation of the trips and trip characteristics for a random sample of households drawn from census data. The simulation source is the 1990 Public Use Micro-data Sample (PUMS) data from the 1990 Decennial Census of the United States. A set of categories is defined for the simulation that allows the development of significantly different statistical distributions of trip characteristics, using the 1995 Nationwide Personal Transportation Survey (NPTS) data. Based on the census data, samples of households are obtained and their trip characteristics in terms of number of trips by purpose, mode, time of departure, and trip length are simulated, using a Monte Carlo type of simulation procedure. This is performed for three regions: Baton Rouge, Louisiana; Dallas-Fort Worth, Texas; and Salt Lake City, Utah
Effect of drainage in unbound aggregate bases on flexible pavement performance by Mingjiang Tao( Book )
3 editions published in 2008 in English and held by 25 WorldCat member libraries worldwide
This study is to determine a proper/optimum gradation by conducting laboratory testing for unbound aggregates of Mexican limestone that are commonly used in Louisiana highways. However, there is trade-off between structural stability and permeability of unbound aggregates. The increase of permeability is often at the cost of structural stability or vice verse. Therefore, the criteria for selecting an optimum gradation are: (1) an adequate permeability to drain the infiltrated-water from the pavement as quickly as possible; and (2) a sufficient structural stability to support the traffic loading. The permeability of unbound aggregate is quantified by its saturated hydraulic conductivity while its structural stability is characterized by various laboratory tests on the strength, stiffness, and permanent deformation of the material. A series of laboratory tests, including constant-head permeability, California Bearing Ratio (CBR), Dynamic Cone Penetrometer (DCP), tube suction (TS), monotonic load traiaxial tests, and repeated load triaxial (RLT) tests, were conducted on Mexican limestone with different gradations. The gradations under investigation include coarse and fine branches of Louisiana class II gradation, New Jersey gradation medium, and an optimum gradation (fine and coarse branches)
Comparative evaluation of subgrade resilient modulus from non-destructive, in-situ, and laboratory methods : final report ( Book )
3 editions published in 2007 in English and held by 25 WorldCat member libraries worldwide
Field and laboratory testing programs were conducted to develop models that predict the resilient modulus of subgrade soils from the test results of DCP, CIMCPT, FWD, Dynaflect, and soil properties. The field testing program included DCP, CIMCPT, FWD, and Dynaflect testing, whereas the laboratory program included repeated load triaxial resilient modulus tests and physical properties and compaction tests. Nine overlay rehabilitation pavement projects in Louisiana were selected. A total of four soil types (A-4, A-6, A-7-5, and A-7-6) were considered at different moisture-dry unit weight levels. The results of the laboratory and field testing programs were analyzed and critically evaluated. A comprehensive statistical analysis was conducted on the collected data. The results showed a good agreement between the predicted and measured resilient modulus from the various field test methods considered. The DCP and CIMCPT models were enhanced when the soil moisture content and dry unit weight were incorporated. The results also showed that, among all back calculated FWD moduli, those back calculated using ELMOD 5.1.69 software had the best correlation with the measured Mr. Finally, the Mr values estimated using the approach currently adopted by the LADOTD were found to correlate poorly with the measured Mr values
Cathodic protection of culverts : field application and expert system by James D Garber( Book )
2 editions published in 1999 in English and held by 25 WorldCat member libraries worldwide
Evaluation of consolidation characteristics of cohesive soils from piezocone penetration tests by Murad Y Abu-Farsakh( Book )
1 edition published in 2004 in English and held by 25 WorldCat member libraries worldwide
This report presents the evaluation of the capability of the current piezocone penetration test (PCPT) interpretation methods to reasonably predict the consolidation parameters needed to predict the total and time rate of settlement of cohesive soils. Seven sites in Louisiana were selected for this study. In each site, in-situ PCPT tests were performed and soundings of cone tip resistance, sleeve friction and pore pressures were recorded. Dissipation tests were also conducted at different penetration depths. High quality shelby tube samples were collected close to the PCPT tests and used to carry out a comprehensive laboratory testing program including unconfined compression test, triaxial test and one-dimensional oedometer consolidation test. The tangent constrained modulus, overconsolidation ratio and the vertical coefficient of consolidation, predicted using the different interpretation methods, were compared with the reference values determined from the laboratory consolidation tests
Development of CMS monitoring procedures by César A Quiroga( Book )
3 editions published in 1998 in English and held by 25 WorldCat member libraries worldwide
This report describes a set of congestion management system (CMS) monitoring procedures known as Travel Time with Global Positioning System (TTG). TTG allows users to efficiently process and store GPS travel time data. The report also includes an updated methodology for estimating required samples sizes and a new methodology to measure delay it signalized intersections
Assessing performance of alternative pavement marking materials by Haoqiang Fu( Book )
2 editions published in 2008 in English and held by 25 WorldCat member libraries worldwide
Pavement markings need to be restriped from time to time to maintain retroreflectivity. Knowing which material provides the most economically efficient solution is important. Currently, no agreed upon method by which to evaluate the use of alternative pavement marking materials exists. This study developed a methodology that measures the benefit of pavement marking materials based on the public perceived benefit of retroreflectivity. Using the measured benefit along with the cost of installation and impact on road users during the installation process, a benefit/cost analysis was applied to evaluate different marking materials used on Louisiana interstate freeways, including thermoplastics (both 40 mil and 90 mil), tape, and inverted profile pavement markings
Effects of hauling timber, lignite coal, and coke fuel on Louisiana highways and bridges ( Book )
1 edition published in 2005 in English and held by 24 WorldCat member libraries worldwide
Comparative performance of rubber modified hot mix asphalt under ALF loading ( Book )
2 editions published in 2003 in English and held by 24 WorldCat member libraries worldwide
Experiment 2 at the Louisiana Accelerated Loading Facility (ALF) site involved determining the engineering benefits of using powdered rubber modifier (PRM) in hot mix asphalt mixes. Three full scale test sections were constructed and subjected to increasing loads from the ALF. Lane 2-1 included PRM in the wearing course, lane 2-2 included PRM in the base course, and lane 2-3 was the control section. Distress and deflection measurements were performed every 25,000 applications of the ALF. Laboratory material characterizations of test lane materials were used in ABAQUS and FLEXPASS modeling studies to predict the behavior and performance of the test lanes. Comparisons of observed and predicted rutting were developed and discussed. Deflection measurements were used to develop a-values for the powdered rubber modified layers for use in pavement design. The recommended a-value for the PRM wearing course was 0.25; it was 0.45 for the PRM base
Modeling hurricane evacuation traffic : development of a time-dependent hurricane evacuation demand model by Haoqiang Fu( Book )
3 editions published in 2006 in English and held by 23 WorldCat member libraries worldwide
Little attention has been given to estimating dynamic travel demand in transportation planning in the past. However, when factors influencing travel are changing significantly over time - such as with an approaching hurricane - dynamic demand and the resulting variation in traffic flow on the network become important. In this study, dynamic travel demand models for hurricane evacuation were developed with two methodologies: survival analysis and sequential choice model. Using survival analysis, the time before evacuation from a pending hurricane is modeled with those that do not evacuate considered as censored observations. A Cox proportional hazards regression model with time-dependent variables and a Piecewise Exponential model were estimated. In the sequential choice model, the decision to evacuate in the face of an oncoming hurricane is considered as a series of binary choices over time. A sequential logit model and a sequential complementary log-log model were developed. Each model is capable of predicting the probability of a household evacuating at each time period before hurricane landfall as a function of the household's socio-economic characteristics, the characteristics of the hurricane (such as distance to the storm), and policy decisions (such as the issuing of evacuation orders). Three datasets were used in this study. They were data from southwest Louisiana collected following Hurricane Andrew, data from South Carolina collected following Hurricane Floyd, and stated preference survey data collected from the New Orleans area. Based on the analysis, the sequential logit model was found to be the best alternative for modeling dynamic travel demand for hurricane evacuation. The sequential logit model produces predictions which are superior to those of the current evacuation participation rate models with response curves. Transfer of the sequential logit model estimated on the Floyd data to the Andrew data demonstrated that the sequential logit model is capable of estimating dynamic travel demand in a different environment than the one in which it was estimated with reasonable accuracy. However, more study is required on the transferability of models of this type, as well as the development of procedures that would allow the updating of transferred model parameters to better reflect local evacuation behavior
Assessing the needs for intermediate diaphragms in prestressed concrete bridges : summary of report by Steve Cai( Book )
3 editions published in 2008 in English and held by 23 WorldCat member libraries worldwide
Reinforced concrete Intermediate Diaphragms (IDs) are currently being used in prestressed concrete (PC) girder bridges in Louisiana. Some of the advantages of providing IDs are disputed in the bridge community because the use of IDs increases the cost and time of construction. There is no consistency in the practice of providing IDs among various states and codes of practice, and the overall effectiveness of IDs, as well as the need for them in prestressed concrete bridges, is unclear. The objectives of this research were (1) to assess the need of reinforced concrete (RC) IDs in PC girder bridges and to determine their effectiveness, and (2) to search for a possible alternative steel diaphragm configuration that could replace concrete diaphragms if necessary. The research team has examined and reviewed state-of-the-art technology and current practices from many sources of information on IDs. Through a survey questionnaire and review of the Louisiana Department of Transportation and Development (LADOTD) Bridge Design Manual, the research team obtained relevant information regarding the ID practices in Louisiana. Through the LADOTD data base for all state bridges, and from direct interaction with district engineers, several of the bridges that are of interest for this study were selected for field inspection. From these field trips to various bridge locations, much information has been acquired from the bridges themselves, as well as from the district engineers. Systematic parametric studies for various bridge configurations, which are representative of an entire range of bridge geometries with different parameters, were analyzed through simplified and solid finite element models. This study was performed on right and skewed bridges, which are simply supported and continuous. A reduction factor that could be multiplied by the AASHTO load distribution factor to account for the influence of the diaphragm in load distribution was developed. A finite element analysis was carried out using 3-D solid models to assess the effectiveness of various diaphragms in protecting the girders against the lateral impact and to determine the design forces in the steel bracing members during construction of deck. The results from the parametric studies indicated that several parameters such as skew, span length, spacing, stiffness of diaphragm and girder have different levels of influence on the effectiveness of diaphragms in live load distribution for bridges. Correction factors that could quantify the ID influence on load distribution were developed. Results from various studies indicated that a steel diaphragm section can possibly replace the RC diaphragms. A prestressed concrete bridge was tested in the field. This bridge was selected by an inspection team comprised of personnel from FHWA, LADOTD, and the LSU research team and is located over Cypress Bayou on LA 408 East, in District 61. A comprehensive instrumentation and loading scheme is presented and illustrated in this report. The instrumentation consists of LVDTs - Linear Variable Differential Transformers (to measure the midspan deflection of each girder), accelerometers, strain gauges, and acoustic emission sensors. The measured results are presented, and comparisons are made between the finite element model and the field tests
Construction and comparison of Louisiana's conventional and alternative base courses under accelerated loading ( Book )
1 edition published in 2001 in English and held by 23 WorldCat member libraries worldwide
Modeling hurricane evacuation traffic : testing the gravity and intervening opportunity models as models of destination choice in hurricane evacuation by Chester Wilmot( Book )
1 edition published in 2006 in English and held by 23 WorldCat member libraries worldwide
The test was conducted by estimating the models on a portion of evacuation data from South Carolina following Hurricane Floyd, and then observing how well the models reproduced destination choice at the county level on the remaining data. The tests showed the models predicted destination choice on the remaining data with similar accuracy. The Gravity Model predicted evacuation to friends or relatives in 110 different counties with an average error of 1.55 evacuations over all destinations, while the corresponding error for the IOM was 1.64. For evacuation to hotels or motels in 70 different counties, the Gravity Model gave an average error of 1.48 evacuations and the IOM an average error of 1.50. However, when the IOM was modified to make the sequencing of opportunities sensitive to the direction of evacuation relative to the path of the storm, the modified IOM performed slightly better than the Gravity Model with average errors of 1.55 and 1.43 evacuations to friends and relatives, and motels and hotels, respectively. The transferability of the Gravity Model for evacuations to friends and relatives was also tested in this study by applying the model estimated on the Hurricane Floyd data in South Carolina to data from Hurricane Andrew in Louisiana. Transferability was tested by comparing the trip length frequency distributions from the two data sets, the similarity of friction factors from models estimated on each data set, and the ratio of the Root-Mean Square-Error (RMSE) of destination predictions of a locally-estimated model to a transferred model on the Andrew data. No significant statistical difference was found between the trip length frequency diagrams or the sets of friction factors at the 95 percent level of significance. The ratio of RMSEs on the Andrew data was 0.67, indicating that the average error of a locally-estimated model was 67 percent that of the transferred model
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Alternative Names

controlled identity Louisiana. Department of Transportation and Development

controlled identity Louisiana. Department of Transportation and Development. Research and Development Section

controlled identity Louisiana State University (Baton Rouge, La.)

Louisiana. Department of Transportation and Development. Louisiana Transportation Research Center
Louisiana State University (Baton Rouge, La.). Louisiana Transportation Research Center
Louisiana. Transportation Research Center
English (53)