Moisture-density relationship, Civil Engineering

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.

Posted Date: 1/22/2013 2:49:38 AM | Location : United States







Related Discussions:- Moisture-density relationship, Assignment Help, Ask Question on Moisture-density relationship, Get Answer, Expert's Help, Moisture-density relationship Discussions

Write discussion on Moisture-density relationship
Your posts are moderated
Related Questions
Define Corrosion - Deterioration of Steel Structures? Corrosion is the principle cause of deterioration of steel structures. Corrosion of steel is an electrochemical process th

Permanent magnets are made of what kind of materials ? Answer: It is made of hard magnetic materials.

Sheet rock cannot be installed in the new house you are building until a building inspector approves the plumbing, electrical, HVAC, and insulation.  This is an example of:

Question: What are dissimilar applications of draglines, backhoes and shovels? Answer: An excavator is distinct as a power-operated digging machine and it includes di

Basic Keywords related to road materials: Sub-grade     :            The portion of road embankment immediately below the pavement. Soil Classifications :            A sy

how to defined work from whole to the part

Question Is it necessary that stiff or soft fenders be designed for berthing in piers? Answer Elasticity of fenders is related to ability to release stored energy duri

I only want Part 1 of this order, can you adjust the quote?


what is the density of rcc