Friday Facts, September 17, 2010, Vol. 71

Bureau of Nutrition and Health Promotion part of the Iowa Department of Public Health produces of weekly newsletter about the Iowa WIC Program for the State of Iowa citizen.

Durability Study of Type II Cements, MLR-71-03 and R-247, 1971

A study of type II cements at the Iowa State Highway Commission concluded that the amount of tricalcium aluminate in the cement appears to have an inverse effect on concrete durability. This conclusion agrees with the results of the Kansas Highway Department's study to determine the combination of cement and aggregate which would produce the best possible durability factor. This study is a result of the questions raised following the completion of the project at the Iowa State Highway Commission. This project is being conducted on a larger scale so. that more definite conclusions can be drawn. The purpose of this project is to determine if the amount of tricalcium aluminate in type II cements has an inverse effect on the durability of concrete.

Jefferson County, Township 71 North Range 10 West

Des Moines River Plat Maps.

Jefferson County, Township 71 North Range 11 West

Des Moines River Plat Maps.

Wapello County, Township 71 North Range 12 West

Des Moines River Plat Maps.

Wapello County, Township 71 North Range 13 West

Des Moines River Plat Maps.

Wapello County, Township 71 North Range 14 West

Des Moines River Plat Maps.

Wapello County, Township 71 North Range 15 West

Des Moines River Plat Maps.

Sprinkle Treatment (Bristowes Spreader), HR-512

Safety is an important aspect of highway design. Texture and frictional properties are important characteristics in providing safe roadways. Longevity of desirable frictional properties is highly dependent on the aggregate within asphalt pavement. Iowa unfortunately has areas of the State where the locally available aggregate will not give long lasting desirable frictional properties. Iowa has utilized sprinkle treatments to improve the safety of many new asphalt concrete pavements.

An Investigation of the Chemical Method of Determining the Cement Content of Hardened Concrete, MLR-71-01 and R-248, 1971

The Iowa State Highway Commission Laboratory is called upon to determine the cement content of hardened concrete when field problems relating to batch weights are encountered. The standard test for determining the cement content is ASTM C-85. An investigation of this method by the New Jersey State Highway Department involving duplicate samples and four cooperating laboratories produced very erratic results, however, the results obtained by this method have not been directly compared to known cement contents of concrete made with various cements and various aggregates used in Iowa.

The Annals of Iowa, Winter 2012, Vol. 71, no. 1

A quarterly journal of Iowa authors and their works produced by State Historical Society of Iowa.

The Annals of Iowa, Spring 2012, Vol. 71, no. 2

A quarterly journal of Iowa authors and their works produced by State Historical Society of Iowa.

The Annals of Iowa, Summer 2012, Vol. 71, no. 3

A quarterly journal of Iowa authors and their works produced by State Historical Society of Iowa.

The Annals of Iowa, Fall 2012, Vol. 71, no. 4

A quarterly journal of Iowa authors and their works produced by State Historical Society of Iowa.