W

Warping
Camber of concrete in concrete slabs resulting from differences in temperature and humidity between the surface and the bottom of the slab.

Water / cement ratio
Ratio resulting from dividing weight of water and weight of cement from mixture. At higher ratios, lower mechanical strength and lower durability of concrete.

Wedge
Wooden piece used to compact and level some parts of the arch centering.

White cement
Type of Portland cement, different from gray cement only because of its color. It is manufactured with high-quality raw materials containing minimum quantities of iron oxides and manganese, which are substances that add color to gray cement. Workability Property of concrete mixture, that determines the ease to be molded, casted and finished.