AASHTO T22
Full Name
AASHTO T22 – Standard Method of Test for Compressive Strength of Cylindrical Concrete Specimens
Scope
AASHTO T22 is a fundamental standard test method used to determine the compressive strength of cylindrical concrete specimens. This test is essential for evaluating the quality and performance of concrete used in various construction projects, such as buildings, bridges, pavements, and other structures. The compressive strength of concrete is a critical parameter for ensuring the structural integrity and safety of these structures.
Key aspects of AASHTO T22:
- Purpose: the primary objective of this test is to measure the maximum compressive load that a cylindrical concrete specimen can withstand before failure. This load is then used to calculate the compressive strength of the concrete, which is expressed in terms of stress (force per unit area).
- Specimen types: the standard covers two types of cylindrical concrete specimens:
- Molded cylinders: prepared by casting fresh concrete into cylindrical molds and curing them under controlled laboratory conditions.
- Drilled cores: obtained by drilling cylindrical samples from existing concrete structures.
- Test procedure: the test involves placing the specimen in a compression testing machine and applying a compressive load along its longitudinal axis at a specified rate. The load is gradually increased until the specimen fails, and the maximum load is recorded.
- Calculation: the compressive strength is calculated by dividing the maximum load by the cross-sectional area of the specimen. The standard also provides guidelines for reporting the results, including the average strength, standard deviation, and other statistical parameters.
Significance of AASHTO T22:
- Quality control: AASHTO T22 is widely used in quality control programs for concrete production to ensure that the concrete meets the specified compressive strength requirements.
- Acceptance criteria: the test results are often used as acceptance criteria for concrete deliveries, verifying that the concrete supplied to the project site meets the design specifications.
- Performance evaluation: the compressive strength of concrete is a critical parameter for assessing its overall performance and durability. It is used in various engineering calculations to predict the behavior of concrete structures under different loading conditions.
AASHTO T22 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the AASHTO T22 standard.
Our laboratory offers comprehensive concrete testing services, including the determination of compressive strength according to AASHTO T22. Our experienced technicians utilize modern compression testing machines and adhere to strict quality control procedures to ensure accurate and reliable results.
Contact us for more information.
Resources
Keywords
compressive strength; concrete; cylindrical specimen; compression testing; load; stress; strain; capping; curing; failure