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  2. Subbase (pavement) - Wikipedia

    en.wikipedia.org/wiki/Subbase_(pavement)

    Layers in the construction of a mortarless pavement: A.) Subgrade B.) Subbase C.) Base course D.) Paver base E.) Pavers F.) Fine-grained sand. In highway engineering, subbase is the layer of aggregate material laid on the subgrade, on which the base course layer is located. It may be omitted when there will be only foot traffic on the pavement ...

  3. Subgrade - Wikipedia

    en.wikipedia.org/wiki/Subgrade

    Layers in the construction of a mortarless pavement: A.) Subgrade B.) Subbase C.) Base course D.) Paver base E.) Pavers F.) Fine-grained sand Section through railway track and foundation showing the sub-grade. In transport engineering, subgrade is the native material underneath a constructed road, [1] pavement or railway track (US: railroad track).

  4. R-value (soils) - Wikipedia

    en.wikipedia.org/wiki/R-value_(soils)

    R-Value is used in pavement design, with the thickness of each layer dependent on the R-value of the layer below and the expected level of traffic loading, expressed as a Traffic Index. Details of the pavement design procedure are given in Chapter 600 of the California Highway Design Manual .

  5. Pavement engineering - Wikipedia

    en.wikipedia.org/wiki/Pavement_engineering

    Pavement engineering is a branch of civil engineering that uses engineering techniques to design and maintain flexible and rigid pavements.This includes streets and highways and involves knowledge of soils, hydraulics, and material properties.

  6. AASHTO Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/AASHTO_Soil_Classification...

    The AASHTO Soil Classification System was developed by the American Association of State Highway and Transportation Officials, and is used as a guide for the classification of soils and soil-aggregate mixtures for highway construction purposes.

  7. Construction estimating software - Wikipedia

    en.wikipedia.org/wiki/Construction_estimating...

    A handwritten spreadsheet. A basic estimating spreadsheet. Cost estimators used columnar sheets of paper to organize the take-off and the estimate itself into rows of items and columns containing the description, quantity and the pricing components. Some of these were similar to accounting ledger paper.

  8. Grading (earthworks) - Wikipedia

    en.wikipedia.org/wiki/Grading_(earthworks)

    Section through railway track and foundation showing the sub-grade. Grading in civil engineering and landscape architectural construction is the work of ensuring a level base, or one with a specified slope, [1] for a construction work such as a foundation, the base course for a road or a railway, or landscape and garden improvements, or surface drainage.

  9. California bearing ratio - Wikipedia

    en.wikipedia.org/wiki/California_bearing_ratio

    The California Bearing Ratio (CBR) is a measure of the strength of the subgrade of a road or other paved area, and of the materials used in its construction.. The ratio is measured using a standardized penetration test first developed by the California Division of Highways for highway engineering. [1]