Moisture-density relationship, Civil Engineering

Assignment Help:

Moisture-Density Relationship:

Since various compactive efforts result in varying degrees of compaction, it is necessary to standardize the compactive effort. The most well-known is the Proctor test, prescribed by IS : 2720-Part VII. This consists of compacting the soil in three layers in a mould 100 cm3 volume, with a rammer 2.6 Kg dropped from a height of 31 cm, giving 25 blows on each layer. The Proctor density so derived is used for low volume roads such as Rural Roads. For high volume highways, a heavy compaction is prescribed. The test known as modified AASHTO compaction that (IS : 2720-Part VIII) uses a heavier rammer 4.5 Kg weight, dropped from a height of 45.7 cm, the soil being compacted in 5 layers, each layer receiving 25 blows.

For controlling the density achieved in the field, a core is cut and its volume measured by pouring sand (sand replacement method). Knowing the weight of the core removed and its volume, the density is calculated. It is customary to specify 95 per cent of the laboratory MDD (modified AASHTO compaction) for embankment and 97 per cent for the subgrade for highways. For low volume Rural Roads, it is customary to specify 97 per cent of the laboratory MDD (Proctor's test) for embankment and 100 per cent for the subgrade.


Related Discussions:- Moisture-density relationship

Explain the primary treatment for wastewater, Explain the Primary Treatment...

Explain the Primary Treatment for Wastewater Primary Treatment: to remove the pollutants that floats or settles. Typically 60% of suspended solids and 35% of BOD 5 are removed

Explain the critical depth, Explain the Critical Depth d c is the dept...

Explain the Critical Depth d c is the depth of flow in an open channel that has the lowest energy.  In rectangular open channels:  (d c ) 3 = Q 2 /g(w) 2 In nonrectang

Water waste engineering, wahat is physical characteristic on total suspende...

wahat is physical characteristic on total suspended solid

Consolidation settlement, The integration of strain over the depth is settl...

The integration of strain over the depth is settlement. The method of producing the settlement is non-recoverable when the intensity of stress is removed. Hence, a permanent reduc

Explain the strength design (lrfd), Explain the Strength Design (LRFD)   ...

Explain the Strength Design (LRFD)   1. γ Factors are applied to loads and φ factors applied to resistance. 2. Unfactored service loads receive a load factor γ > 1.0

Define truss analysis-stability, Define Truss analysis-stability   ...

Define Truss analysis-stability   Identify whether a truss is determinate or indeterminate. Identify if the truss is stable or unstable   m = number of membe

Lagrange''s mean value theorem, Write some appplications of lagrange''s mea...

Write some appplications of lagrange''s mean value thorem

Truss, Wind Force acting on truss

Wind Force acting on truss

#soil survey., Explian obstacles in chaining but not ranging.

Explian obstacles in chaining but not ranging.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd