For weak and poor quality subgrade there is a need to increase the thickness of pavement to compensate for it In order to save cost for sub base which is relatively expensive the concept of capping layer is introduced in which capping materials of cheap but strong nature are used to cap the weak subgrade
·subgrade has a CBR value less than 10 the subbase material will deflect under traffic loadings in the same manner as the subgrade and cause pavement deterioration The subbase the layer of aggregate material immediately below the pavement provides drainage and stability to the pavement
·The subbase course must be better quality than the soil subgrade the subbase is often omitted if soil subgrades are of high quality Depending on site conditions subgrade improvements may also be performed However the role of different base and subbase layers and rationale for using different base types and layering are not well documented
·The subbase is the layer of aggregate material that lies immediately below the pavement and usually consists of crushed aggregate or recycled materials 1 The Main Roles of the Subbase Layer in Pavements Include provision of the following Dawson 1995 • Protection for the subgrade from significant deformation due to traffic loading
·The basic difference between coarse and fine soil is its behaviour when exposed to water Image wiki Types of subbase for flooring Subbase too is categorized under four divisions Cementitious [PCC] Granular [ GSB/ WBM/ WMM] Hill Earth [ Morrum] and Insulation [Cold Storage] Cementitious It is the best understood among all sub base
·In concrete paving terminology the subgrade is the soil the pavement is built on Usually it is treated by compacting it sufficiently to prevent the pavement from settling Subbase is composed of the layer s of material between the subgrade and the concrete pavement A subbase may not always be required
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