Significance of Subgrade Soil
Subgrade soil is an integral part of the road pavement structure as it provides the support to the pavement from beneath. The subgrade soil and its properties are important in the design of pavement structure. The main function of the subgrade is to give adequate support to the pavement and for this the subgrade should prossess sufficient stability under adverse climate and loading conditions.
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The formation of waves, corrugations, rutting and shoving in black top pavements, and the phenomena of pumping, blowing and consequent cracking of cement concrete pavements are generally attributed due to the poor subgrade conditions.
When soil is used in embankment construction, in addition to stability, incompressibility is also important as differential settlement may cause failures. Compacted soil and stabilized soil are often used in sub base or base course of highway pavements. The soil is therefore considered as one of the principal highway materials.
Highway and Transport Engineering
and this section is about highway materials
(refference : Khanna, S.K., Justo, C.E.G., Highway Engineering, 3th edition, Nem Chand & Bros Roorkee (U.P.), 1976.)
picture from www.athleticturf.net
The formation of waves, corrugations, rutting and shoving in black top pavements, and the phenomena of pumping, blowing and consequent cracking of cement concrete pavements are generally attributed due to the poor subgrade conditions.
When soil is used in embankment construction, in addition to stability, incompressibility is also important as differential settlement may cause failures. Compacted soil and stabilized soil are often used in sub base or base course of highway pavements. The soil is therefore considered as one of the principal highway materials.
Highway and Transport Engineering
and this section is about highway materials
(refference : Khanna, S.K., Justo, C.E.G., Highway Engineering, 3th edition, Nem Chand & Bros Roorkee (U.P.), 1976.)
Title Post: Significance of Subgrade Soil
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