🪨⛏️🦰

#gravel #quarry #crushed stone #pebbles

🔨🪨🛣️

#crushed stone #aggregate #road building #stone pavement #McAdam method

🪨🧱➡️🏗️

#construction aggregate #building materials #gravel #crushed stone #concrete component #civil engineering #infrastructure material

∙∙∙`🪨

#small stones #gravel #tiny rocks #rock fragments #crushed stone #pebble quantity #bits of rock

🚆🛤️🪨

#railroad ballast #trackbed #railway stones #train track foundation #crushed stone