Friday Facts, January 27, 2012, Vol. 128

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.

X-Ray Diffraction of Highway Materials, HR-128, 1969

X-ray diffraction data during adsorption of water vapor on Na- and Ca-montmorillonites show that interlayer expansion is continuous but nonuniform. X-ray and adsorption isotherm data indicate an ice-like configuration of water molecules is completed with the fourth layer of interlayer water for the Ca-clay; a fifth layer intrudes to give a less ordered structure. Data for the Na-clay indicate a laminar stacking arrangement for up to three layers of interlayer water. The Na-clay adsorbs more than twice as much water and undergoes four times as large a volume change than the Ca-clay. The free energy change during adsorption of water vapor on the Ca-clay is nearly twice that for the Na-clay. Free energy changes with increasing relative pressure reflect interlayer expansion increments.

Iowa Department of Transportation Major Items - Preliminary Quantity Report, December 18, 2012; With Addendums

Weekly letting report.

Iowa Department of Transportation Major Items - Preliminary Quantity Report, February 19, 2013; With Addendums

Weekly letting report.

Iowa Department of Transportation Major Items - Preliminary Quantity Report, July 16, 2013; With Addendums

Weekly letting report.

Iowa Department of Transportation Major Items - Preliminary Quantity Report, May 20, 2014; With Addendums

Weekly letting report.

Examination of Closing the Existing Highway Maintenance Garage at Hamlin, Iowa, 1983

An optimum allocation model has been utilized to examine the existing allocation of highway segments to maintenance garages in the Hamlin study area. The model has also been used to evaluate the financial effect of closing the garage at Hamlin. The examination of the study area shows that only three of 48 highway segments should be reallocated at an annual operational savings of approximately $1,400. The study concludes there would be an annual operational savings of approximately 128,700 if the garage at Hamlin were closed.

Iowa Department of Transportation Major Items - Preliminary Quantity Report, February 17, 2015; With Addendums

Weekly letting report.

Investigation of the Lane-Wells Road Logger, HR-113, 1966

The Lane-Wells Road Logger was utilized primarily to determine the feasibility of employing such a device for moisture and density control in Iowa highway construction. A secondary objective was the use of the Road Logger to obtain information concerning moisture content and density during and after construction. Correlation studies with conventional test results required a small portion of the lease period. Practically all phases of construction and most materials utilized in base and surface courses were surveyed. Results of this study were good, in general, with the Road Logger indicating dry density slightly higher and the moisture content slightly lower than conventional results in most instances. Economic feasibility seemed to pose the greatest problem for the acceptance of the Road Logger as a standard compaction control device. It would appear from the findings of this study that probably only large projects, or several smaller contracts tested simultaneously, could justify the expense of the Logger. A total of about 128 miles were surveyed with the Logger during the lease period. Approximately 16 days of downtime due to minor breakdowns were recorded. Inclement weather forcing construction delays resulted in several idle days in which the Logger's full capabilities were not realized.

Iowa Department of Transportation Major Items - Preliminary Quantity Report, February 16, 2016; With Addendums

Weekly letting report

Iowa Department of Transportation Major Items - Preliminary Quantity Report, May 17, 2016; With Addendums

Weekly letting report