United States Department of Transportation
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Abstract:This bulletin is the second in a series of compilations of reports on completed research done for the Iowa Highway Research Board Project HR-1, "The Loess and Glacial Till Materials of Iowa; an Investigation of Their Physical and Chemical Properties and Techniques for Processing Them to Increase Their All-Weather Stability for Road Construction." The research, started in 1950, was done by the Iowa Engineering Experiment Station under its project 283-S. The project was supported by funds from the Iowa Highway Research Board of the Iowa State Highway Commission. In Iowa the abundance and wide distribution of loess and glacial till materials makes them the logical ones with which to start working. The principal objectives of the project may be summed up as follows: 1. To determine by means of both field and laboratory studies the areal and stratigraphic variation in the physical and chemical properties of the loess and glacial till materials of Iowa; 2. To develop new equipment and methods for evaluating physical and chemical properties of soil where needed; 3, To correlate fundamental soil properties with the performance of soils in the highway structure; 4. To develop a scientific approach to the problem of soil stabilization based on the relationships between the properties of the soils and those of the admixtures; and 5. To determine the manner in which the loess and glacial till materials of Iowa can be processed for optimum performance as highway embankments, subgrades, base courses, and surface courses.
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