Construction, operations and maintenance

Construction, operations and maintenance



General advice on cement: A common cause of cracks in structures and linings (e.g. in tanks, dams, waterways, and wells) is errors in mixing and applying the cement. First, it is important that only pure ingredients are used: clean water, clean sand, clean rocks. The materials have to be mixed very thoroughly. Second, the amount of water during mixing needs to minimal: the concrete or cement needs to be just workable (somewhat dry) and not fluid. Lastly, it is essential that during curing the cement or concrete is kept moist at all times, for at least a week. Structures should be covered with plastic, large leaves or other materials during the curing period, and kept wet regularly.
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