Is the LBR value affected by moisture at the time of compaction?

• A. Yes
• B. No
• C. Depends on soil type
• D. Not enough data

Answer: (A)

Moisture during compaction changes how densely the soil can pack and how its particles arrange themselves. The LBR value is a measure of the compacted soil’s bearing-like resistance, which strongly depends on the density and structure created by the compaction process. When moisture content is near the optimum, particles rearrange efficiently, packing more tightly and producing a higher LBR. If the soil is too dry, compaction is less effective and the LBR tends to be lower; if it’s too wet, excess water reduces inter-particle friction and the structure can loosen, also lowering the LBR. Because the moisture at the time of compaction directly alters the achieved density and soil fabric, the LBR value is affected by it.