ASTM C403

Full Name

ASTM C403 – Standard Test Method for Time of Setting of Concrete Mixtures by Penetration Resistance

Scope

ASTM C403 outlines the procedure for determining the time of setting of concrete mixtures with a slump greater than zero. This is done by measuring the penetration resistance of mortar sieved from the concrete mixture.

Specifically, the standard covers:

  • Purpose: the main purpose is to determine the initial and final setting times of concrete, which are important for construction scheduling and quality control.
  • Test procedure: mortar is sieved from the concrete mixture and placed in a container. A penetration resistance test is performed at regular intervals to measure the increasing stiffness of the mortar as it sets.
  • Initial setting time: the time at which the mortar reaches a specified penetration resistance, typically 3.5 MPa (500 psi).
  • Final setting time: the time at which the mortar reaches a specified penetration resistance, typically 27.6 MPa (4000 psi).
  • Apparatus: the standard specifies the equipment required for the test, including a penetration resistance tester, a container, a sieve, and a thermometer.

ASTM C403 is applicable to:

  • Concrete mixtures with slump greater than zero: the test method is not suitable for very dry or stiff concrete mixtures.
  • Laboratory and field conditions: the test can be performed in both controlled laboratory environments and field conditions.

This standard is essential for:

  • Construction planning: determining the setting time helps in scheduling construction activities, such as finishing operations and formwork removal.
  • Quality control: ensuring that the concrete sets within the expected timeframe, which is crucial for its strength development and overall performance.

However, ASTM C403 does not cover:

  • Other setting time tests: there are other test methods available for measuring the setting time of concrete, such as the Vicat needle test (ASTM C191) and the Gillmore needle test (ASTM C266).
  • Factors affecting setting time: the setting time of concrete can be influenced by various factors, such as temperature, humidity, cement type, and admixtures. These factors are not directly addressed in the standard but should be considered when interpreting the results.

ASTM C403 Accredited Laboratory

Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C403 standard.

Contact us today to learn more about our testing capabilities and how we can support your business.

Resources

Keywords

setting time; penetration resistance; concrete; mortar; slump; initial setting time; final setting time