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Wooden piece under prop.
Cement or brick box used to ease the performance and to strip drainage tubes and to control direction or level changes.
Product ready to have water added and to be used just as normal concrete. It includes cement, gravel and sand in adequate proportions.
Product including Portland cement and an adequate proportion of sand. It is ready to add water in the construction and to be used in masonry.
Property of concrete, which tends to reduce volume upon drying. It produces cracks when there are restrictions that avoid free contraction.
Capacity of the construction to resist weathering action, chemical attack, abrasion and other conditions to which construction is exposed.
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