What is a Modified Proctor test?
Modified Proctor Test is performed to know the characteristics of soil through compaction with change in water content ultimately giving us the relation between soil moisture content and dry density of soil. It is a modified version of the Standard Proctor Test.
What is the difference between standard and modified Proctor test?
The main difference in the two tests are that the standard Proctor test uses a 5.5-lb hammer dropping a distance of 12 in, while the modified Proctor uses a 10-lb hammer dropping 18 in. The difference is to simulate either light rollers or tamping for the standard Proctor, and heavy rollers for the modified Proctor.
What is Aashto T180?
AASHTO T 180-21 method of test is intended for determining the relationship between the moisture content and density of soils when compacted in a given mold of a given size with a 4.54-kg (10-lb) rammer dropped from a height of 457 mm (18 in.).
What should be the rammer weight for Modified Proctor?
The Modified Proctor Test is of great importance and is widely used in the construction of roads, highways, earth fill dams, earth filling, Airports, etc. In modified Proctor test, the soil is compacted in the given mold in Five (05) layers with a rammer of 10 lbs (4.5 kg) with a fall of 18 inches (45 cm).
What does 95 Modified Proctor mean?
For example, specifications often require compaction to be 95 percent of Standard Proctor. This means the on-site soil density must be equal to 95% of the maximum achievable compaction.
Is code for Modified Proctor test?
IS:2720 part-08
Modified Proctor Test as per IS:2720 part-08 (MDD test)
Why do we use a modified Proctor rather than a standard Proctor?
Relatively higher energy is applied in modified proctor tests compared to standard, thus yielding higher unit weight of the soil. If the project requires a higher bearing capacity or stiffer soil, more energy is applied to soil in order to achieve better compaction.
What is standard Proctor compaction test?
The Proctor compaction test is a laboratory method of experimentally determining the optimal moisture content at which a given soil type will become most dense and achieve its maximum dry density.
What are Aashto standards?
The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United States.
What is modified Proctor density?
Reinforced soil structures routinely specify that all soils be compacted to a minimum of 95% of the maximum density determined by ASTM D698 – Standard Proctor Density for conformance with the design.
What is the weight of hammer is 2720 Modified Proctor test?
Place the mould on a solid base such as a concrete floor or plinth and compact the moist soil into the mould, with the extension attached in 5 layers of approximately equal mass, each layer being given 25 blows with the 4.90 kg the hammer dropped from a height of 450 mm above the soil.
What is 95% Mod Aashto?
The test gives the engineer a baseline of how the optimal moisture content and achievable density for a specific compaction effort. 95% compaction means that the soil on the construction site has been compacted to 95% of the maximum density achieved in the lab.
What does mod Aashto stand for?
AASHTO. American Associate of State Highway and Transportation Officials.
How do you calculate soil MDD?
This can be measured by mainly two methods Standard Proctor Compaction Test and Modified Proctor Compaction Test. Both the tests help to determine the optimum moisture content that is required for soil to attain maximum compaction i.e maximum dry density for performing construction.
What’s the difference between AASHTO and ASTM?
Where AASHTO focuses on writing standards that meet the needs of the domestic transportation industry, ASTM International focuses on writing standards that meet the needs of all the world’s industries. They maintain standards covering crayons to field goal posts and everything in between.
How many AASHTO standards are there?
Technical revisions were made in 25 of the standards since the Thirty-Second Edition, 26 standards were reconfirmed, 1 standard was updated, 4 new standards were added, 4 standards were discontinued, and 3 standards were deleted.
What is standard Proctor density?
The original Proctor test, ASTM D698 / AASHTO T99, uses a 4-inch-diameter (100 mm) mould which holds 1/30 cubic feet of soil, and calls for compaction of three separate lifts of soil using 25 blows by a 5.5 lb hammer falling 12 inches, for a compactive effort of 12,375 ft-lbf/ft3.