BS EN 12390-13:2021 is a technical standard that specifies the methods for making and curing test specimens from sprayed concrete. This standard, which was published in 2021, is part of the broader BS EN 12390 series that covers various aspects of testing hardened concrete.
Making Test Specimens
One of the key requirements of BS EN 12390-13:2021 is to ensure that the test specimens are representative of the actual sprayed concrete. To achieve this, the standard provides guidelines on the equipment and procedures for sampling the fresh concrete, as well as preparing and filling the molds.
The standard describes the different types of molds that can be used, such as cylinder or cube molds, and specifies their dimensions and tolerances. It also outlines the recommended procedure for compacting the concrete into the molds and ensures that proper consolidation takes place.
Moreover, BS EN 12390-13:2021 details the curing conditions necessary for the test specimens. It states the required temperature and humidity levels during the curing period, which typically lasts for a minimum of 7 days. This controlled environment helps in simulating real-world conditions and allows accurate testing of the hardened concrete.
Testing the Hardened Concrete
Once the test specimens have been made and cured following the guidelines provided by BS EN 12390-13:2021, they are ready for testing. This standard offers several methods to determine the compressive strength and flexural strength of the sprayed concrete.
For compressive strength testing, the standard specifies the procedure for loading the specimens until failure using specialized equipment. It also defines the calculation method to determine the compressive strength based on the maximum load attained and the cross-sectional area of the specimen.
When it comes to flexural strength testing, BS EN 12390-13:2021 outlines the test setup and procedure using a four-point or three-point bending test. This type of test measures the ability of the sprayed concrete to resist bending under load and provides valuable insights into its performance.
Importance of BS EN 12390-13:2021
BS EN 12390-13:2021 plays a crucial role in ensuring the quality and reliability of sprayed concrete in various construction applications. By following the standardized methods for making test specimens and conducting tests, engineers and contractors can accurately assess the properties of sprayed concrete and make informed design decisions.
Adhering to this technical standard also helps in achieving consistency and comparability of test results across different laboratories and projects. It allows for better communication and exchange of information between stakeholders in the construction industry, ultimately leading to safer and more durable concrete structures.
In conclusion, BS EN 12390-13:2021 is an essential technical standard that provides guidelines for making and testing test specimens from sprayed concrete. It sets out the procedures for sampling, filling molds, curing, and determining the compressive and flexural strength of the hardened concrete. By following this standard, the construction industry can ensure the quality and performance of sprayed concrete, contributing to the overall success of construction projects.
Nina She