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Show GOOD ROADS ' PROPER CONCRETE MATERIAL Just What Kind Are Best and Proportions Pro-portions for Mixing Made Subject Sub-ject for Experiments. (Prepared by the Vntud States Department of Agriculture.) Kxperlmcnts to determine Just what kinds of materials ure best for concrete, con-crete, and in what proportions to mix them so that they will wear well in a road are being made by engineers of the bureau of public roads. United States Department of Agriculture. An apparatus will be used that consists Mixing Materials for Concrete Road. of heavy steel wheels which, guided by a mechnnical arrangement, roll continuously con-tinuously back and forth over the pavement. More than 40 different sections of concrete pavement, each ten feet long, will be laid. Materials from many different dif-ferent parts of the county are being shipped to the government experiment farm at Arlington, Va., near Washington. Washing-ton. They ,will be mixed with varying vary-ing quantities of cement and water to determine which is best. Experience has shown that there is a measurable amount of wear of the surface of a concrete road each year. |