Which statement describes a primary advantage of non-shrink structural grout in masonry?

• A. The grout does not shrink during curing, helping maintain core dimensions and alignment.
• B. The grout expands significantly after curing.
• C. The grout becomes highly permeable after setting.
• D. The grout is always stronger than cement, regardless of mix.

Answer: (A)

Dimensional stability of grout during curing is the key advantage. Non-shrink structural grout is formulated to resist volume change as it sets, so it maintains the spaces, cores, and alignment that masonry relies on. If grout shrinks, it can pull away from block faces, create gaps, and allow movement under load, which can lead to misalignment and cracks. By staying dimensionally stable, the grout helps lock masonry units in place, keep joints tight, and ensure consistent load transfer through the grout bed.

Expanding after curing would cause movement and disrupt alignment, not fix it. High permeability would invite water intrusion and deterioration, which is undesirable. Saying it’s always stronger than cement regardless of mix isn’t accurate; strength depends on mix design, but the essential benefit of non-shrink grout is preventing shrinkage to preserve geometry.