Highway Construction Materials From the Consolidated Rocks of Southwestern Iowa

Southwestern Iowa, unlike other parts of the State, does not have plentiful near-surface supplies of stone available for highway construction purposes. The long and intensive search for such road material by quarrymen, highway engineers, geologists, and others interested in all phases of stone use resulted in a growing conviction that the only hope of locating new and significant deposits lay in a regional geological survey. Further, such a survey would result in the delineation of areas where exploration should be economically feasible as well as those areas where exploration would have little or no chance of success. These views formed the foundation for de-veloping the project covered by this report under a cooperative agreement with the Iowa Highway Research Board of the Iowa State Highway Commission. The aims of the project were (1) to locate and describe all consolidated rocks found in place at the surface, or penetrated by drilling or other means; (2) to correlate these rocks geologically; (3) to assemble this information and the valid geological inferences from it into cross sections and maps showing the type of bedrock, thickness of overburden and rock structure; and (4) to write appropriate comments so that the potential usefulness and the most promising sites for future exploration or expansion for stone quarries can be readily seen and be of maximum value. The report was prepared with the knowledge that its chief immediate use would be by highway engineers and geologists, county engineers, materials producers, and prospectors. To facilitate their use of the report, certain phases were stressed and some standard methods of presentation and arrangement were not rigidly followed. The scientific integrity of the report is not compromised by these deviations from the formal scientific writing practices, nor is the value of the report for other uses thereby lessened

Metric Plan Reading Course

This Plan Reading Course was developed by the Department of Civil and Construction Engineering of Iowa State University under contract with the Iowa Highway Research' Board, Project HR-324. It is intended to be an instructional tool for Iowa Department of Transportation (DOT), county and municipal employees within the state of Iowa. Under this contract, a previous Plan Reading Course, prepared for the Iowa State Highway Commission in 1965, has been completely revised using a new format, new plans, updated specifications, and new material. This course is a self-taught course consisting of two parts; Highway Plans, and Bridge and Culvert Plans. Each part consists of a self-instruction book, a set of plans, a question booklet, and an answer booklet. This is the self-instruction book for the Bridge and Culvert Plans part of the course. The example structures included in this part of the course are a prestressed concrete beam bridge and a reinforced concrete box culvert. The accompanying plans for those structures are: BRIDGE ON U.S. 65 - OVER RELOCATED U.S. 18 - This is a 70.5 m x 27.3 m pretensioned, prestressed concrete beam bridge in Cerro Gordo County, Design No. 1895, September 1996; and REINF. CONC. BOX CULVERT, 2.4 m x 1.5 m x 66.2 m, Cerro Gordo County, Design No. 895, April 1996

Subgrade Insulation to Prevent Soil Freezing

This report concerns the use of thermal insulation under rigid pavement. It is recognized that the desirability of preventing soil freezing applies equally to the supporting subgrade for flexible pavement. The exact placement of the insulation under either type of pavement will depend upon individual job requirements and the ingenuity of the designer. It should be kept in mind that the installation method and its compatibility with standard construction procedures is an important factor in the cost of the project. If the installation method is complicated, it will likewise be costly. In this event, the use of thermal insulation may not prove economical in comparison with the conventional practice of replacing the frost-susceptible subgrade soil with granular material

County Condemnation Manual: Manual of Practice and Procedure for the Acquisition of Real Property Through the Exercise of the Power of Eminent Domain

The County Condemnation Manual is intended to assist all county offices and officials in the performance of their condemnation related duties. The manual contains a summary of acquisition policy and makes recommendations to implement law and policy. The manual contains procedural guides and illustrative forms to assist in the preparation of condemnation documents. The manual identifies facts and issues that should be brought to the attention of other professionals to assure compliance with the law, adequate preparation, a valid proceeding and that the county is appropriately represented at the hearing. Case and statutory citations are provided to assist the reader where more detailed research is necessary

Flood-plain and channel aggradation at selected bridge sites in the Iowa and Skunk River Basins, Iowa /

"Iowa DOT Research Project HR-350."Shipping list no.: 96-0246-P.Includes bibliographical references (p. 42-44).Mode of access: Internet

Potential-scour assessments and estimates of maximum scour at selected bridges in Iowa /

Shipping list no.: 95-0325-P.Includes bibliographical references (p. 41-42).Mode of access: Internet

Soil Stabilization With Cement and Lime

Soil-cement and soil-lime research during the years 1961-1963 was reported in a series of 22 Progress Reports and Special Reports which have been submitted and are listed in the appendix to this report. The purpose of this final report is to summarize the findings presented in these reports. The contents of this report are as follows: Soil-Cement Research: (1) Mix Design; (2) Shrinkage; (3) Strength-Maturity; (4) Improvement with Additives; Soil-Lime Research: (5) Lime Requirements of Iowa Soils; (6) Pulverization Requirements; (7) Development of a "Super" Lime; Structural Properties and Test Roads: (8) Structural Properties of Soil-Cement and Soil-Lime; (9) Test Roads; Soil-Lime-Fly Ash: (10) Soil-Lime-Fly Ash; and Appendix A: Reports Submitted under HR-83 (449-S)

Estimating design-flood discharges for streams in Iowa using drainage-basin and channel-geometry characteristics /

Shipping list no. 93-0654-P.Includes bibliographical references (p. 42-44).Mode of access: Internet

A Review of Depth of Cover Tables for Concrete and Corrugated Metal Pipe for the Iowa Department of Transportation

Iowa Standard Roadway Plan DR-104 contains maximum embankment fill heights that can be placed above concrete and metal pipes commonly used by the Iowa Department of Transportation. In order to update this tabular data reflective of current design methodologies and recent research findings, this study was undertaken in order to review the topic of allowable embankment cover

Residual Stresses and Fatigue Behavior of Welded Structural Members

The objective of the project was to study experimentally the fatigue behavior of flange plates in welded beam sections as influenced by different residual stress distributions which are caused by different sizes of welds