ACI Field ASTM C172 Sampling Freshly Mixed Concrete for ACI - Short Version

ASTM C172/C172M-17 Latest version as of the creation of this video on 3/31/24, is a standard practice for sampling freshly mixed concrete and determining its properties. It outlines the procedures for obtaining samples of freshly mixed concrete in order to assess its uniformity and consistency. The standard provides guidelines for both field and laboratory sampling of concrete.
Here are some key points covered in ASTM C172:
Purpose: The standard aims to ensure that samples of freshly mixed concrete are representative of the entire batch and suitable for testing various properties such as air content, density, and slump.
Sampling Methods: ASTM C172 describes several methods for sampling freshly mixed concrete, including the use of sampling tubes, containers, or buckets. The choice of method depends on factors such as the type of concrete, the placement method, and the equipment available.
Sample Size: The standard specifies the minimum size of concrete samples based on the maximum aggregate size and the intended tests. Larger aggregates may require larger sample sizes to ensure representativeness.
Sample Handling: ASTM C172 provides guidance on how to handle and transport concrete samples to the laboratory without causing segregation or loss of moisture. Proper labeling and identification of samples are also important aspects covered in the standard.
Testing Procedures: While ASTM C172 primarily focuses on sampling, it references other ASTM standards for testing properties such as air content (ASTM C231/C231M), density (ASTM C138/C138M), and slump (ASTM C143/C143M). These standards detail the specific testing procedures to be followed.
Quality Control: Sampling and testing of freshly mixed concrete are crucial for quality control and assurance purposes. Following the procedures outlined in ASTM C172 helps ensure that concrete meets the desired specifications and performance requirements.
It's important for professionals in the concrete industry, including engineers, contractors, and technicians, to be familiar with ASTM C172 and other relevant ASTM standards to ensure the proper handling, testing, and evaluation of concrete mixtures.

[@andy_o6133]

thank you this was a lot of help, do you have any recommendations on what to focus on for the test?

[@WackeyWorxWorkshop]

@@andy_o6133 for C172 knowing all 5 types of mixers and how to sample from each. In the practical, there should be a list in the ACI book that tells you all the questions that they're going to ask you. Make sure that you know that one by heart cuz they're looking for those exact answers.

[@andy_o6133]

@@WackeyWorxWorkshop thank you so much I just got my book 2 days ago, I see the questions your talking about. I will do exactly that memorize them by heart!

[@andy_o6133]

@@WackeyWorxWorkshop can I ask you one other question. I’m pursuing an apprenticeship in the local 12 Operating Engineers. And some coworkers in my current job tell me horror stories about the layoffs in other union jobs do you have any insight or experience in this subject? I just bought a house not long ago and I can’t afford to get laid off

[@WackeyWorxWorkshop]

@@andy_o6133 I am not in any union but I have found that the more that you can do the more valuable that you make yourself, the less that you'll ever get laid off. I have never been released from any job doing CMT testing. I now run five Labs in the Atlanta metro area. I have no college education and barely graduated high school. The only person I answer to is is the vice president of the company. On a daily basis I get called upon from them to answer questions about testing projects and what test should be run. The more you put into it, the more you learn, the more that you're needed.

[@andy_o6133]

@@WackeyWorxWorkshop man that just made me so damn instead. I told my wife since starting this journey to become an inspector that from now on I will not not be studying for a new certification, until I’m happy where we are In life I just turned 30 so it’s grind time for me. Thank you for your reply you just reassured me that I’m headed in the right direction.

[@Jwshs88]

I very nervous for this aci exam 🌚

[@WackeyWorxWorkshop]

@@Jwshs88 this one is pretty easy if you have reviewed the ASTMs and book from your local ACI.

[@Jwshs88]

@@WackeyWorxWorkshop I hope I do this perfectly. And can you make another video for all aci questions ans

[@WackeyWorxWorkshop]

@@Jwshs88 I am still working on them as well as other ACIs