Mix design answers one deceptively simple question: how much bitumen should go into the mix? Too little and the aggregate is not properly bound, so the pavement ravels and lets water in. Too much and the mix becomes unstable, rutting under traffic and bleeding to the surface. This post covers the four design methods, the objectives…
Seven tests, one purpose — deciding whether a given stone is fit to build a road with. This post works through each test in turn: what it does, the apparatus, the formula, and the permissible limits you need to remember. The Seven Tests 1. Crushing Test One of the modes in which pavement material can…
Ask most people what a road is made of and they will say tar or concrete. Both answers are wrong by volume. A road is overwhelmingly made of stone — the bitumen or cement is only the glue holding it together. This post covers what aggregates are, the binders used with them, and the numbers that show…
