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.