Massachusetts Unrestricted Construction Supervisor License Practice Test

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 is not an effective method specifically aimed at preventing efflorescence. Efflorescence occurs when soluble salts within the mortar or concrete mixture migrate to the surface as the water evaporates. While high-early strength cement may provide benefits in terms of curing time and strength development, it does not influence the chemical processes that lead to efflorescence. In contrast, forming good mortar joints, stocking materials off the ground, and covering materials at all times directly address conditions that can lead to moisture accumulation and salt migration. Good mortar joints help ensure that water is not trapped between joints, while keeping materials off the ground prevents moisture from rising up from the earth. Additionally, covering materials protects them from rain and moisture during the curing process, minimizing the risk of efflorescence formation.