What is the meaning of Proctor? 2

[tmgczb]

Usually，we mention 95% MMPDD in our drawings.
But I don‘t know the meaning of Proctor.
Is it a name of a Scientist or an equipment,like the rammer?
This thread may seem to be too easy but it is a question to me.

 

[Milliontown]

Ralph Proctor was the field engineer on the Bouquet Canyon dam project (and St. Francis Dam) for the LA Department of Water and Power. He developed the standard we know know as the proctor test. The proctor test was modified (I think during WWII) by USACE to increase compaction for airfields serving larger bombers.

 

[tmgczb]

So Proctor is the name of an engineer. But I saw the word in the report record of a lab.

 

[GeoEnvGuy]

Yes it is the name of the engineer. The term is referenced in the ASTM as well

"the equipment and procedures are similar as those proposed by R.R. Proctor 1933... The standard effort test is sometimes referred to as the Proctor test."

 

[dik]

thanks for the info.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[epoxybot]

I came across these powerpoint presentations awhile back.

HOW GEOTECHNICAL ENGINEERING NEEDS SHAPED THE HISTORY OF CALIFORNIA

COMPACTION TESTS evolved to support bomber loads on runways

 

[EireChch]

Easily found using google

 

[geotechguy1]

Question has already been answered but note that the same test is just referred to as 'Standard Compaction Test' in the UK, NZ and Australia. Alternately the test called the 'DCP' is called a 'Scala' in NZ.

Geotechs have a weird thing for cults of personality.

 

[EireChch]

Some people also refer to it as 2.5kg and 4.5kg compaction test, being standard and modified, respectively.

I think DCP/scala is one of the most under used test in geotechnical engineering, especially for road and somewhat underused for residential.

 

[BigH]

The tests are also called Light and Heavy . . . depending on the hammer used.

If I remember years ago - John Focht posted that originally test was actually based on the wet density . . . . but I could be mistaken due to a few senior moments . . .

 

[geotechguy1]

DCP/scala is definitely underused in North America. It's quick, cheap, easy, and it's absolutely brilliant character building for grads. Plus it looks alot more like actually doing something than a heel test or pushing a bearing probe or bit of rebar an inch into the ground.