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

Determine the grain exact gravity, (i) A dry soil has a void ratio of 0.65 ...

(i) A dry soil has a void ratio of 0.65 and its grain exact gravity is = 2.80. What is its unit weight? (ii) Water is added to the sample so that its degree of saturation is 60%

Disparity between fasteners, Question What is major disparity between ...

Question What is major disparity between fasteners , bolts and screws ? Answer Fastener is a broad term to explain something that is used as a restraint for holding

Wbm work, ratio of moorum and aggregate

ratio of moorum and aggregate

Theorem of three moments, Theorem of three moments: You have been intr...

Theorem of three moments: You have been introduced to the analysis of one of the important class of structures, namely Statically Indeterminate Structures. You have been intro

Show the replacement of loose rivets, Q. Replacement of loose rivets? i...

Q. Replacement of loose rivets? i) Slight slackness of rivet does not cause loss of rivet strength. ii) Renewal of slack rivets should be done only when the slack rivets are

Physics, interplanar spacing

interplanar spacing

Explain the well drawdown equations - ground water, Explain the Well Drawdo...

Explain the Well Drawdown Equations Watch the units, especially if you use log 10 or ln.    h 1 = aquifer thickness minus the drawdown (ft)  r 1 = distance from well (ft

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