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Standard concrete floor slab thickness in residential construction is 4 inches. Five to six inches is recommended if the concrete will Formwork in construction is the use of support structures and moulds to create structures out of concrete which is poured into the moulds. Mix design can be defined as the process of selecting suitable ingredients of concrete and determining their relative proportions Formwork is temporary or permanent molds into which concrete or similar materials are poured. In the context of concrete construction, Shuttering – Formwork which supports the vertical surface is known as shuttering. Centering – Formwork which supports the horizontal A good solid surface is recommended to reduce water being absorbed by the mortar mix. Add 3 parts sand and 1 part masonry cement. If.. For most concrete structures, the curing period at temperatures above 5º C should be a minimum of 7 days or until 70% of the specified.. Water is the key ingredient, which when mixed with cement, forms a paste that binds the aggregate together. The water causes the A concrete mixture ratio of 1 part cement, 3 parts sand, and 3 parts aggregate will produce a concrete mix of approximately 3000 psi. The water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix. A lower ratio leads..