Basic keywords related to road materials, Civil Engineering

Basic Keywords related to road materials:

Sub-grade     :           The portion of road embankment immediately below the pavement.

Soil Classifications :           A system of classifying soils.

Gravel            :           A coarse gained soil having more than half of coarse fraction.

Sand   :           A coarse gained soil having less than half of coarse fraction.

Slit      :           A fine grained soil having particles of size 0.002- 0.075 mm.

Clay    :           A fine grained soil having particles of size less than 0.002 mm.

Soil Compaction      :           Densification of soil to a desired density.

Optimum Moisture Content         :           The moisture content at which the density is (OPM) maximum.

Maximum Dry Density (MDD)    :           The maximum density of soil achieved with optimum moisture content.

Proctor Density        :           Density obtained by the method of compaction prescribed by Proctor and used for low volume roads.

Modified AASHTO Density         :           Density obtained by a heavy rammer and used for high traffic roads.

Sand Replacement Method          :           A method of determining the density achieved in the field.

Califormic Bearing Ratio   :           A measure of the supporting capacity of a soil (CBR)   sub-grade.

Igneous Rocks         :           Rocks such as granite and basalt formed by cooling of molten volcanic material.

Sedimentary Rocks :           Rocks formed by deposition of granular material.

Metamorphic Rocks           :           Rocks formed by transformation of igneous and sedimentary rock through heat and pressure.

Limestone     :           Rock containing mainly Calcium Carbonate.

Laterite          :           Rock formed by decomposition of basalt and other rocks.

Gradation      :           A system of determining the particle size distribution of aggregates.

Deleterious Material           :           Materials like vegetable matter, soft particles, clay lumps, mica, coal, etc. which can adversely affect the performance of road aggregates.

Posted Date: 1/22/2013 3:15:13 AM | Location : United States

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