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Conrete used in Paving

Concrete is a mix of sand, gravel, and portland cement. The mixture must be worked mechanically into a freshly mixed slurry compacting the interior and allowing a thinner layer to rise to the surface to prevent honeycombing.

Concrete uses cement and water as the glue between sand and crushed rock. Workers place concrete into steel molds called forms.

A finishing machine vibrates and trims it to the necessary height. To prevent cracks, workers cut joints between the concrete slabs. At each joint, wire baskets and steel dowels connect the slabs. These allow the slabs to expand and contract as the temperature changes. The slabs can slide from side to side along the dowels, but not up and down.