Hydrated Lime specification includes what composition and tolerance?

• A. 0.5% lime with a tolerance of ±0.1%
• B. 1.0% lime with a tolerance of 0.9% to 1.1%
• C. 2.0% lime with a tolerance of 1.8% to 2.2%
• D. 1.5% lime with a tolerance of 1.3% to 1.7%

Answer: (B)

The key idea is that hydrated lime in this use is specified by a precise content plus a tight tolerance. The standard calls for 1.0 percent lime by weight in the mix, with an allowable range from 0.9 percent to 1.1 percent. This narrow window ensures the lime provides its intended moisture-control and anti‑stripping benefits consistently across batches. If the lime content dips below 0.9%, its effectiveness can drop and performance becomes unreliable; if it rises above 1.1%, you risk unnecessary material costs and potential effects on workability and compaction. So, 1.0% with a 0.9–1.1% tolerance is the correct specification. Other options would either underdose or overdose the lime and do not align with the required consistency.