According to the Department of Transportation for the State of Ohio, proof rolling is a process where compacted soil is checked for soft areas in order to supply a balanced support system for the structure of pavement. If soft subgrade spots are located during construction, they are corrected so that the density of the subgrade is maintained.Know More
According to Ohio's DOT, one trip with a proof roller is usually sufficient for locating soft spots. However, the agency warns that an overloaded proof roller, regardless of the soil type, may cause subgrade instability during the rolling process. On the flip side, soft areas may not be found if the roller is too light for the type of soil.
The Ohio DOT says that a 35-ton roller with a tire pressure of 120 psi should be used on soil classified as A-3, A-4, A-6 and A-7. The aforementioned tire pressure and load is indicated for use on Ohio soils. For granular soils, the DOT suggests using a 50-ton roller with 150 psi of tire pressure.
Some soft soils may be 3- to 5-feet deep. Only in rare cases is a soft spot be deeper than 5 feet. The agency adds that insufficient stability is marked by cracking, rutting or deflection on a subgrade's surface.Learn more about Soil
There are over thirty types of clay, but in pottery these types are divided into the three main classes of earthenware clay bodies, mid-fire stoneware clay bodies and high-fire stoneware clay bodies. These three classes are sometimes described as earthenware, stoneware and porcelain, respectively, after the type of pottery these clays make.Clays fired at higher temperatures tend to be less permeable.Full Answer >
Chaparral soil is typically dry and rich in iron oxides that give it a cinnamon or chestnut color. It contains little clay and lacks organic material.Full Answer >
Gypsum is found in sedimentary rock formations across the world in over 85 countries and mined in 17 states. Gypsum is also known as calcium sulfate dihydrate.Full Answer >
Soil pollution is caused by the contamination of soil from man-made chemicals. This, in turn, is caused by a variety of factors, the most glaring of which includes chemical fertilizers, mining and quarrying, and incorrect disposal of waste.Full Answer >