Glencoe Carpentry Practice Test 2026 - Free Carpentry Practice Questions and Study Guide

Understanding how aggregate is classified by size relies on sieve openings. Particles larger than a given opening are called coarse; those small enough to pass through are fine. In this context, the threshold is 1/4 inch. Any piece bigger than 1/4 inch is considered coarse and is retained on the 1/4 inch sieve, forming the coarse portion of the mix. Smaller particles pass through and become fine aggregate, which helps with workability and finish. This 1/4 inch boundary is chosen to balance strength, density, and ease of placement in typical carpentry concrete work.