Massachusetts Construction Supervisor License (CSL) Practice Test

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Which of the following is NOT an effective method of preventing efflorescence?

  1. Forming good mortar joints

  2. Using high-early strength cement

  3. Stocking materials off of the ground

  4. Covering materials at all times

The correct answer is: Using high-early strength cement

Using high-early strength cement may not be an effective method for preventing efflorescence because the issue primarily arises from the migration of soluble salts to the surface of masonry due to moisture. High-early strength cement is designed to reach strength quickly but does not inherently address the management of moisture or the control of soluble salts within the masonry. In contrast, forming good mortar joints helps create a barrier that can limit moisture ingress, while stocking materials off the ground allows for better airflow and reduces the chances of moisture accumulation. Covering materials at all times protects them from rain or snow, which can introduce water that facilitates salt migration and efflorescence. Therefore, these other practices directly target the factors contributing to efflorescence and are effective methods for its prevention.

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