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

Knife edge loads – representation of wheel axles, Q. Knife edge loads – rep...

Q. Knife edge loads – representation of wheel axles? In BS5400 traffic loads for HA loading are given by uniformly distributed loads along loaded length and a knife edge load.

Explain the analysis of singly reinforced rectangular beams, Explain the An...

Explain the Analysis of Singly Reinforced Rectangular Beams: 1. Determine the area of steel reinforcement, As. Multiply the number of bars by the area of each bar. 2. Calcul

Geology class, I want to get answer of each questions that I Have in a sep...

I want to get answer of each questions that I Have in a separate paragraphs, and the information should be from sources so please fro each question that you answer write after it t

Product layout, Product Layout: Imagine a factory manufactures taps, d...

Product Layout: Imagine a factory manufactures taps, drills, reamers and cutters. The production of each of these items needs different machines which may be placed in differe

Sight distance - geometric design of roads, Sight Distance: Sight dis...

Sight Distance: Sight distance is the distance along a road at which a driver has a visibility of objects and can safely stop his vehicle or overtake another vehicle. Sto

Differentiate between short column and slender column, Differentiate betwee...

Differentiate between Short Column and Slender Column Short Column It is a column of  rectangular section, the effective length of which does not exceed 12 times of  its lea

Cumulative distribution function - poisson distribution, Cumulative distrib...

Cumulative distribution function - Poisson distribution: Find the cdf of Y = X 1 , + X 2 where X I and X 2 independently follow Poisson distribution with parameters λ l an

Compute the degree of saturation, The maximum dry density and optimum moist...

The maximum dry density and optimum moisture content of a soil from standard proctor's test are 18 kN/m 3 and 16% respectively. Compute the degree of saturation of the sample,

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