NCMA CMU-WR1

Full Name

NCMA CMU-WR1 – Standard Test Methods for Water Stream and Water Droplet Tests of Concrete Masonry Units

Scope

The NCMA (National Concrete Masonry Association) CMU-WR1 outlines two standard test methods for evaluating water repellency in concrete masonry units (CMUs): water droplet and water stream tests.

These relatively simple and quick tests provide preliminary insights into a CMU’s ability to resist water absorption:

  • Water droplet test: this method involves placing a specified volume of water droplets onto the CMU’s surface and monitoring their behavior over time. The test assesses factors like water beading, absorption rate, and spreading.
  • Water stream test: a continuous stream of water is directed onto the CMU’s face for a set duration. Following the test, the unit is inspected for signs of water penetration on the interior surface.

The NCMA CMU-WR1 tests offer several advantages:

  • Simplicity: they are easy to perform in a laboratory or even at field locations.
  • Cost-effectiveness: they require minimal equipment and time, making them a budget-friendly option.
  • Initial assessment: they provide a preliminary indication of a CMU’s water repellency.

However, it’s important to acknowledge the limitations of these tests:

  • Qualitative: they provide a subjective assessment based on visual observations.
  • Limited scope: they don’t simulate the full range of water exposure conditions a CMU might encounter in real-world applications.

While the NCMA CMU-WR1 tests offer valuable preliminary insights, for a more comprehensive assessment of water repellency, consider the NCMA CMU-WR2 Spray Bar Test: the test utilizes a spray bar to simulate wind-driven rain, providing a more rigorous evaluation of a CMU’s ability to resist water penetration under pressure.

Contact us today to discuss your specific needs and learn how our testing services can help ensure your concrete masonry units meet the required water resistance standards for your project.

Resources

Keywords

water repellency; concrete masonry unit; CMU; water droplet test; water stream test; absorption; penetration

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