What is defined as the nominal maximum size in aggregate?

The definition of nominal maximum size in aggregate is accurately represented by identifying the first sieve that retains more than 10% of the material. This measurement is crucial in determining the largest size of aggregate that can be used in hot mix asphalt. It is an important criterion as it influences the workability, strength, and durability of the asphalt mixture.

When a sieve retains more than 10% of the aggregate, it indicates that this particle size is critical in the gradation of the mix. This gradation affects the voids between particles, the binding of asphalt cement with the aggregates, and ultimately the performance of the hot mix asphalt in terms of stability and resistance to deformation.

Understanding the nominal maximum size helps inspectors and engineers to ensure that the mix design aligns with specifications that promote optimal performance and longevity of the pavement. This definition is critical in quality control during the asphalt production process and helps to predict how the mix will behave under traffic loads.