How to calculate compactive energy??
How to calculate compactive energy??
(OP)
I want to make different compactive energy and take relationship between some properties. So I thought to make different compactive energy by changing rammer weight, height of drop, no of bowls , no of layers. How do I calculate compactive energy as a one value from using one combination . ( one combination mean- (2.5kg,30cm , 27 , 3), (4.5kg,30cm,27,3),(2.5kg,45cm,27,3)..........).





RE: How to calculate compactive energy??
RE: How to calculate compactive energy??
RE: How to calculate compactive energy??
RE: How to calculate compactive energy??
In my area it seems that geotechs often recommend 'compact to 98% SPMDD within 2% of optimum' in 200mm lifts. And then the results come back 6% dry of optimum and 98%. Some will say, re-do the proctor. They re-do the proctor with a sample dug out from the location where the test was performed. The proctor comes back. Same as before.
What energy is a standard proctor equivalent to? A 100 lb plate tamper? 1000 lb plate tamper? What about a 15 ton roller? What if you're compacting it with D-11 cats and 797 haul trucks? How many passes?
In 1930 whatever when these tests were developed, what compaction equipment were they using and how does that compare to what is being used today?
RE: How to calculate compactive energy??
The moisture-density relationship (Proctor) was developed in the 1920's by R.R. Proctor, who was with the Bureau of Public Roads, a US Government agency.
Originally there was only the "standard" Proctor. That was because the equipment was relatively rudimentary and the compactive effort variable. The test was developed as a "standard", not necessarily meant to mimick the compactive effort in the field, but to provide a standard method of laboratory testing so that one could assess variations in the soil, moreso than to assess variations in compactive effort. The selected laboratory compactive effort for the test was done in an effort to approximate probable compactive effort in the field, but knowing that it would be variable depending on equipment.
One reason for this standardization of a test method is that you might have one piece of compaction equipment doing all the compaction on the site, but you might have a variety of soils that would be encountered across that same site due to the inherent nature of soil variability. With a standardized laboratory test with which to compare the field effort you could quickly assess if you were getting similar compaction across various soil types.
As equipment became better by its evolutionary design, the "modified" Proctor was developed, again to approximate the compactive effort in the field, but moreso to assess soil variations while attempting to achieve comparable compaction in all.
RE: How to calculate compactive energy??
RE: How to calculate compactive energy??