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Number of concrete samples per unit volume of concrete
4

Number of concrete samples per unit volume of concrete

Number of concrete samples per unit volume of concrete

(OP)
Hi!

What is the ACI standard that specifies the number of concrete samples to be taken per unit volume of concrete? I have often seen 3 samples per 75 m^3 of concrete for each pour in technical specifications.

Thank you,

Logan82

RE: Number of concrete samples per unit volume of concrete

ACI 301 1.6.4.2.d

Quote (Obtain at least one composite sample for each 100 yd3, or fraction thereof, of each concrete mixture placed in any one day. When the total quantity of a given concrete mixture is less than 50 yd3, the strength tests may be waived by the Architect/Engineer.)


EDIT - Local building codes may have their own prescription that you will want to adhere to (some much more strict than ACI). Also, in restoration we test every 3rd truck, which would be every 27m3. But this is not at all typical for new construction.

RE: Number of concrete samples per unit volume of concrete

(OP)
Thank you! This is exactly what I was looking for!

RE: Number of concrete samples per unit volume of concrete

From my Project Notes:

CONCRETE QC
WATER SHALL NOT BE ADDED TO THE CONCRETE MIX ON SITE UNLESS APPD IN WRITING BY THE CONCRETE SUPPLIER AND AUTHORISED BY THE ENGINEER
PROVIDE HISTORY OF CONCRETE MIX USE IN ACCORDANCE WITH CSA A23.1
TESTING SHALL BE IN ACCORDANCE WITH THE REQUIREMENTS OF CSA A23.1 UNLESS NOTED OTHERWISE
A MINIMUM OF THREE CYLINDERS SHALL BE TAKEN FOR STRENGTH TESTS, ONE CYLINDER FOR 7 DAY STRENGTH AND TWO CYLINDERS FOR 28 DAY STRENGTH
TEST CYLINDERS SHALL BE 6" DIA X 12" HIGH U/N
SLUMP TESTS SHALL BE TAKEN WITH EACH SET OF CYLINDERS TAKEN FOR STRENGTH TESTING
AIR CONTENT TESTS SHALL BE TAKEN FROM EACH LOAD UNLESS A REDUCED FREQUENCY IS AUTHORISED IN WRITING BY THE [OWNER | CONSULTANT | ENGINEER]
CYLINDERS FOR STRENGTH TESTS AND A SLUMP TEST SHALL BE TAKEN FROM AT LEAST EACH THIRD TRUCK
A MINIMUM OF THREE CYLINDERS FOR STRENGTH TESTS, AND A SLUMP TEST SHALL BE TAKEN EACH DAY FOR EACH DIFFERENT TYPE OF CONCRETE MIX DESIGN
WHERE THE FREQUENCY OF TESTING ABOVE WILL PRODUCE LESS THAN THREE TESTS FOR A GIVEN CLASS OF CONC, TESTS SHALL BE MADE FROM AT LEAST THREE RANDOMLY SELECTED BATCHES
IF LARGE VOLUMES OF CONCRETE ARE BEING SUPPLIED (OTHER THAN BY TRUCK), THERE SHOULD BE A MINIMUM OF THREE CYLINDERS TAKEN FOR STRENGTH TESTING, ONE AIR TEST AND ONE SLUMP TEST FOR EACH 100 CUBIC METRES OR PART THEREOF
CARE SHALL BE EXERCISED IN PROTECTING THE TEST CYLINDERS FROM DAMAGE
TEST CYLINGERS SHALL BE PROPERY CURED
IF TEST RESULTS SHOW A LARGE 'SCATTER' OF DATA, ADDITIONAL TESTING SHOULD BE PRESCRIBED
THE TESTING AGENCY SHALL FORWARD A COPY OF ALL TEST RESULTS DIRECTLY TO THE [OWNER | CONSULTANT | ENGINEER] AT THE TIME THE TEST RESULTS ARE FORWARDED TO THE CONTRACTOR
IF CONCRETE SPECIFIED IS IN EXCESS OF 35 MPA, THE CLIENT SHALL ARRANGE FOR THE GEOTECHNICAL CONSULTANT TO REVIEW THE CONCRETE BATCH PLANT
FOR TESTING MASONRY GROUT, REFER TO NOTES ON MASONRY CONSTRUCTION

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

-Dik

RE: Number of concrete samples per unit volume of concrete

(OP)
Hi Dik,

Thank you for the reply.

I am curious regarding the phrase "IF CONCRETE SPECIFIED IS IN EXCESS OF 35 MPA, THE CLIENT SHALL ARRANGE FOR THE GEOTECHNICAL CONSULTANT TO REVIEW THE CONCRETE BATCH PLANT".

1) What is the problem associated with a concrete too strong?
2) What can the geotechnical consultant do about it?

RE: Number of concrete samples per unit volume of concrete

It means the required use of the concrete may warrant extra care, and you want to make sure the plant can provide the services and skill necessary to produce the mix. It's beyond my skill set, and I like a good geotekkie to help confirm all is well. Geotekkies, in these environs, are up on cement and concrete stuff...

I'm not a big one for project specifications and I rely on comprehensive project notes in lieu of them... too often I've encountered projects where drawings are readily available, but the specs are gone... none in the last decade have had that issue. There was a major project in Winnipeg, where the consultant I was working for questioned my comprehensive notes. The project engineer inadvertently forgot to include the specifications with the construction documents... There could have been a huge extra to contract on that project if it weren't for the comprehensive notes. This was about a decade back. This is the current size and it's a *.txt file... so it's large... and the archive has all my changes to it for the last 30 years or whatever; the date included is the date of the last revision. It was updated a couple of days back for 'jam nuts', but I haven't had a chance to update the file name.



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

-Dik

RE: Number of concrete samples per unit volume of concrete

Dik, when are you going to publish these notes? The snippets along the way have well and truly whetted my appetite, especially jam and nuts.

RE: Number of concrete samples per unit volume of concrete

I have to edit them to remove client information, and will upload them later today... they are edited, and specific parts updated, for each project.

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

-Dik

RE: Number of concrete samples per unit volume of concrete

(OP)
Thank you dik! I'm also eager to see those notes!

RE: Number of concrete samples per unit volume of concrete

@dik,

Why do you use upper case text in all of your specifications? It seems like shouting and is more difficult to read than normal text.

BA

RE: Number of concrete samples per unit volume of concrete

Quote (Why do you use upper case text in all of your specifications?)


Habit I guess... the drawing notes occupy the first of several sheets of the drawing set... and because drawing notes are usually capitalised... no other reason. set at 5/64 text height... and for a D sized drawing 6 columns per page... also Arial, except there is some columnar stuff that I have to modify the font so it lines up...

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

-Dik

RE: Number of concrete samples per unit volume of concrete

(OP)
Now, that's alot of drawing notes! Thank you!

How do you use this text file? Do you use a particular software?

I typically write my drawing notes in Microsoft Word, and then link Microsoft Word to my drawing software (Inventor or AutoCAD).
That way, I have the following features:
- Numbering of each clause on multiple levels (For example: clause 1.2.1.3).
- Navigation pane for easier navigation

RE: Number of concrete samples per unit volume of concrete

5/64 text? Wow! I've been humming and hawing about going from 1/8 to 3/32...damn. Probably my least favourite part of design (getting the text legible and lined up).

RE: Number of concrete samples per unit volume of concrete

Thank you, Dik. Looking forward to some nuggets of wisdom.

RE: Number of concrete samples per unit volume of concrete

If you have the full version of CAD, Word2CAD is a useful add on for importing word documents into CAD with the formatting intact. It is not perfect, but speeds up the process. I believe architectural graphics standards dictates capital letters for drawings. You sure are helpful with the ol general notes dik.

RE: Number of concrete samples per unit volume of concrete

I use platinum Bricscad, but several versions out of date. I was running Bricscad 12 when version 14 came out and I hadn't installed version 13, that I had. I'm not a draftsman and don't use most of the features even the old version has. I use Bricscad for my SMath images converting the *.pdf to *.png using paint.net. It works great... a screenshot of a typical image... The subscripts can be done in the text override as a single string... I use the margin, off the page, to store information I need that won't print... I usually restrict the printed output to a *.pdf of the 'Summary' only and not the entire program. The program may be 15 pages and the summary only 2. If I'm running several different conditions for the same project, I append the *.pdf output to the same file so I may have the output for half a dozen different conditions in the same output. It's not as complicated as it sounds and you get pretty quick at doing it.



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

-Dik

RE: Number of concrete samples per unit volume of concrete

dik - so you put your "comprehensive notes" on all drawings? Most of the projects on which I have worked over the last 20+ years have specific order of precedence. Down the list is Specifications rule over Drawings and Drawings rule over BOQ. Many times I have seen the drawings and the specifications not matching - hence the contractor, especially if the drawings are more onerous, cry for the use of the specifications. Guess on that one job this would be a moot point in that no specifications were provided.

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