How Exposed Aggregate Actually Gets Its Finish
Exposed aggregate starts as a normal concrete pour with decorative stone aggregate mixed through it, but the finishing process is what creates the look. A surface retarder is applied at a precise stage of the cure, which slows hardening of just the top few millimetres of cream paste. That layer is then washed and lightly brushed away — usually within 24 hours — to reveal the stone aggregate sitting just below the surface, without disturbing the structural concrete underneath.
Getting the timing right is the entire skill in this finish. Wash too early and the stones dislodge or wash out unevenly; wait too long and the retarder loses effectiveness and the surface won't expose properly. It's a finish that rewards experience far more than most people expect from what looks like a simple decorative effect.
A Practical Fit for Adelaide's Climate and Lifestyle
Exposed aggregate holds up particularly well in Adelaide conditions — the textured surface doesn't show tyre marks, dust or everyday grime the way a flat solid-colour driveway does, which matters through a dry Adelaide summer when dust and pollen settle on every outdoor surface. It's also a genuinely practical choice around pools and alfresco entertaining areas, where the natural grip underfoot matters as much as the look.