Q:

What is proof rolling?

A:

Quick Answer

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.

Continue Reading

Full Answer

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
Sources:

Related Questions

  • Q:

    Why are soil boring tests conducted?

    A: A soil boring test are conducted for different reasons, including to determine good drilling locations and depths for wells and basements. The soil boring ... Full Answer >
    Filed Under:
  • Q:

    What is soil degradation?

    A: Soil degradation is the decline in soil quality caused by its improper use, usually for agricultural, pastural, industrial or urban purposes. Deserts are e... Full Answer >
    Filed Under:
  • Q:

    What is a frost line?

    A: The frost line is the maximum depth at which soil is frozen, or the lower limit of permafrost. The depth of the frost depends on the local climate, the hea... Full Answer >
    Filed Under:
  • Q:

    What is soil texture?

    A: According to Colorado State University Extension, soil texture is defined by the size of the particles that make up the soil. Soil texture typically is cat... Full Answer >
    Filed Under:

Explore