At 16 days, the aggregate expansion limit is 0.15 percent. What is the expansion limit for one year or less?

• A. 0.04 percent
• B. 0.15 percent
• C. 0.40 percent
• D. 0.01 percent

Answer: (A)

Expansion limits for aggregate are tied to the curing period. The standard uses a stricter threshold for longer timeframes to ensure long-term stability. If the expansion is measured over a year or less, the allowable limit is 0.04%, which is more restrictive than the 16‑day limit of 0.15%. That tighter cap helps prevent significant expansion from developing within the first year of use. The other options either repeat the 16‑day limit (0.15%), are too permissive (0.40%), or too small (0.01%) compared to the established standard for a year or less.