explain more Propose the suitable material to be used as sub base and base layer

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Propose the suitable material to be used as sub base and base layer by considering the condition of the existing soil to be used as subgrade.If the proposed aggregate as in the design data are to be used as sub base and base, provide appropriate explanation

8.id 4 ,.41 pm Question Anonymous 38 minutes later Solution Sub Base a) To act as drainage layer Protect Subgrade b)To improve the load supporting capacity by Distributing the load - Flexible pavement c) Prevent mud pumping, continuous support for slab &to; protect subgrade Base Layer a) Structural layer Distribute stresses b)Strength and Stability to pavement system c) WBM, WMM, CRM Rigid Pavements Cement Concrete Pavements Sub Base layers: - a) Granular layers WBM,WMM etc b) DLC Dry lean Concrete/ Roller compacted concrete GROUP INDEX THICKNESS (cm) 0 05 30 45 62 78 90 20 so, our G.I value is 13.4 so thickness should be 60 cm to 65 cm 0 Was this answer helpful? 0 "? 0

Explanation / Answer

We can either stabilise the present subgrade to acceptable limits by:

Cement/ Lime-Soil Stabilization: Cement or hydrated lime in the range of 3 to 5 per cent brings remarkable improvement in the engineering characteristics of such expansive soils.

Choice of Top Wearing Courses on Flexible Pavement: choice of bituminous surfacing on road crust is an important parameter in enhancing the life of the pavement. In order to eliminate the ingress of water into the pavement crust, it is preferred to adopt impervious surfacing of low void content, such as dense asphaltic concrete, premix carpet with liquid seal coat, bituminous macadam with seal coat etc.

For sub Base and base course we can use those aggregates which are less susceptible to volume change and donot allow the ingress of moisture in the subgrade. Like , Stabilised sand , GC soil(clayey gravel)

If proposed sub base and base courses are to be used then the only option is to stabilise the subgrade which can be best and most economically done by Lime or cement .

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