What should be done with CMUs that have visible cracks?

When dealing with concrete masonry units (CMUs) that exhibit visible cracks, it is crucial to prioritize the integrity and safety of the structure in which they will be used. Evaluating and replacing cracked CMUs is essential because visible cracks can indicate underlying structural issues that may compromise the performance of the masonry.

Cracks can negatively affect the load-bearing capacity and durability of the units; therefore, a thorough assessment of the extent of the damage should be conducted. This includes determining whether the cracks are superficial or structural in nature. If the cracks are extensive or if the integrity of the CMU is significantly compromised, replacement becomes necessary to ensure the structural reliability and safety of the masonry work.

Using cracked CMUs without evaluation can lead to significant problems down the line, including potential failures in the masonry structure. Therefore, the correct approach is to evaluate these units and replace them if they do not meet the required performance standards.