Coordination of Transit and School Busing in Iowa, Final Report, December 2003

The 2003 Iowa General Assembly asked the Iowa Department of Transportation (Iowa DOT) to conduct a study of Iowa public policy regarding coordination of public transit services and school transportation. This report describes the efficiencies that may be obtained by coordinating transit management and maintenance systems in the areas of school transportation, public transit, and other forms of public transportation. The Center for Transportation Research and Education (CTRE) at Iowa State University studied these issues and prepared this report for the Iowa DOT.

El poble d' Ollers i el veïnat d' Espàsens, a final dels segle XVIII

Article sobre l' estructura social del poble d' Ollers i el veïnat d' Espàsens a finals dels segle XVIII

Final Report on the Polk County Adult Drug Court, 2001

An evaluation has been conducted on the Polk County Drug Court, comparing clients entering the program from its inception through September 30, 1998 with a group of revoked probationers from FY96 (the “pilot group”) and other offenders referred to drug court who did not enter them program (the “referred group”).

Final Report on the Polk County Adult Drug Court Executive Summary and Summary of Findings, 2001

An evaluation has been conducted on the Polk County Drug Court, comparing clients entering the program from its inception through September 30, 1998 with a group of revoked probationers from FY96 (the “pilot group”) and other offenders referred to drug court who did not enter the program (the “referred group”).

Employment and Wages Covered by Unemployment Insurance, Final County Data, Third Quarter, 2003

Third Quarterly County information for Census of Employment & Wages - County

Employment and Wages Covered by Unemployment Insurance, Final Statewide Data, Third Quarter, 2003

Third Quarterly County information for Census of Employment & Wage, Statewide

Employment and Wages Covered by Unemployment Insurance, Final County Data, Fourth Quarter, 2003

Fourth Quarterly County information for Census of Employment & Wage, County

Employment and Wages Covered by Unemployment Insurance, Final Statewide Data, Fourth Quarter, 2003

Fourth Quarterly County information for Census of Employment & Wage, Statewide

Quarterly Census of Employment and Wages, Final County Data, First Quarter, 2004

First Quarterly County information for Census of Employment & Wage, County

Quarterly Census of Employment and Wages, Final Statewide Data, First Quarter, 2004

First Quarterly County information for Census of Employment & Wage, Statewide

Development of a Manual Crack Quantification and Automated Crack Measurment System, Project TR-457 Final Report, 2005

Final report produced by DOT on development of manual crack quantification and automatic crack measurment system.

Optimal Usage of De-Icing Chemicals when Scraping Ice, Final Report of Project HR 391, 2003

Optimal Usage of De-Icing Chemicals when Scraping Ice, Final Report of Project HR 391

Final Report, Secondary Road Fund Distribution Advisory Committee, 2002-2005

This report presents the findings and recommendations of the Secondary Road Fund Distribution Advisory Committee (SRFDAC) established by SF 2192 of the 2002 Iowa Acts.

Determine Initial Cause for Current Premature Portland Cement Concrete Pavement Deterioration Final Report, 2000

A detailed investigation has been conducted on core samples taken from 17 portland cement concrete pavements located in Iowa. The goal of the investigation was to help to clarify the root cause of the premature deterioration problem that has become evident since the early 1990s. Laboratory experiments were also conducted to evaluate how cement composition, mixing time, and admixtures could have influenced the occurrence of premature deterioration. The cements used in this study were selected in an attempt to cover the main compositional parameters pertinent to the construction industry in Iowa. The hardened air content determinations conducted during this study indicated that the pavements that exhibited premature deterioration often contained poor to marginal entrained-air void systems. In addition, petrographic studies indicated that sometimes the entrained-air void system had been marginal after mixing and placement of the pavement slab, while in other instances a marginal to adequate entrained-air void system had been filled with ettringite. The filling was most probably accelerated because of shrinkage cracking at the surface of the concrete pavements. The results of this study suggest that the durability—more sciecifically, the frost resistance—of the concrete pavements should be less than anticipated during the design stage of the pavements. Construction practices played a significant role in the premature deterioration problem. The pavements that exhibited premature distress also exhibited features that suggested poor mixing and poor control of aggregate grading. Segregation was very common in the cores extracted from the pavements that exhibited premature distress. This suggests that the vibrators on the paver were used to overcome a workability problem. Entrained-air voids formed in concrete mixtures experiencing these types of problems normally tend to be extremely coarse, and hence they can easily be lost during the paving process. This tends to leave the pavement with a low air content and a poor distribution of air voids. All of these features were consistent with a premature stiffening problem that drastically influenced the ability of the contractor to place the concrete mixture. Laboratory studies conducted during this project indicated that most premature stiffening problems can be directly attributed to the portland cement used on the project. The admixtures (class C fly ash and water reducer) tended to have only a minor influence on the premature stiffening problem when they were used at the dosage rates described in this study.