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Unit 6 SUBGRADE
SUBJECT : Pavement Materials and Construction
AUTHOR : Hemanth J
PUBLISHED ON : 25/09/17
NUMBER OF PAGES : ( 15 Pages)
PRICE : Rs 8.25

The subgrade is earth graded to the desired elevation. The principal function of subgrade stabilization is to provide a stable grade for subsequent construction. In highway engineering, subgrade is the native material underneath a constructed road or the lower most layer of a highway pavement. It is also called formation level. Subgrades are commonly compacted before the construction of a road, and are sometimes stabilized by the addition of bitumen, lime, Portland cement or other modifiers. The subgrade is the foundation of the pavement structure, on which the sub-base is laid. The load-bearing strength of subgrade is measured by California Bearing Ratio (CBR) test, falling weight deflectometer and other methods.

     

 
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