Consolidating stiff concrete mold

For this reason it is not a good idea to completely separate the science of concrete from the more mundane process of making it.No one expects contractors and construction workers to manufacture plate glass, extrude pipe, or press drywall, but they are regularly expected to make good quality concrete.

The lower the workability, the more mixing energy and mixing time is required.Wet curing under burlap, plastic sheeting or curing blankets allows the concrete to gain strength and density during the critical early days after casting.Well-cured concrete inhibits water movement, and this is one important step to controlling primary and secondary efflorescence.Eliminating primary efflorescence begins before the concrete is cast, simply by using basic good concreting practices: Start with a concrete mix that uses well-graded aggregates, a low water-to-cement (w/c) ratio, and fly ash or other pozzolan as a partial cement replacement; use a water reducer to increase workability without adding extra water to the mix.Extra water in the concrete makes it more porous, weaker, and more susceptible to shrinkage cracking.

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