What are the acceptable limits for fines in aggregate bases, as related to the No. 200 sieve?

The acceptable limits for fines in aggregate bases related to the No. 200 sieve are typically set between 0% and 10%. This range ensures that the amount of fine particles in the aggregate material is sufficient to fill the voids between larger particles, while also allowing for adequate drainage and stability within the aggregate structure. Having fines within this limit promotes improved compaction and reduces the likelihood of excessive moisture retention, which could lead to weakening of the aggregate base.

When the percentage of fines exceeds 10%, it may lead to undesirable conditions, such as too much plasticity or an increase in potential for erosion, and could negatively impact the strength and performance of the base layer. This is why adherence to the specified range is crucial in aggregate base applications.