50) yield better quality cement that can resist occasional exposure to mild acids. The American Concrete Institute (ACI) and the Portland Cement Association (PCA) have established that lower water-to-cement ratios (that is, less than. Further, the cement and aggregate (and admixtures, for that matter) should be selected with care: All need to be of good quality and consistency and of an appropriate grade for use in pool plaster.Ī water-to-cement ratio of. Plaster that is too rich tends to shrink and crack, while plaster that is too lean is unworkable and isn‘t durable. This ratio results in a higher-quality pool plaster finish than either richer (more cement) or leaner (more sand) mixes. The best cement-to-aggregate ratio is about 1 part cement to 1.5 to 1.75 parts aggregate (marble sand) - with quartz finishes being a little richer in cement. To see the revised version, please click here. Kim Skinner has extensively updated this article. This recognition has in turn led to development of a list of ten basic recommendations that reliably result in the creation of durable plaster. In the process, we‘ve learned something unsurprising - that known principles of concrete/cement science actually apply to pool plaster. All of that has been dedicated to reaching a better understanding of plaster‘s performance, including the causes and mechanisms of problems ranging from etching, scaling and nodule formation to delaminations, spotting, staining and general surface deteriorations. Landscape & Hardscape Materials/EquipmentĪs familiar as it may seem, plaster is far more complicated than most people think.Īs a consequence of that complexity, it has for years been the subject of discussion, controversy and a great volume of research and analysis.Outdoor Living, Fire Features, Amenities & Lighting.Other Waterfeatures (from birdbaths to lakes).WaterShapes - Janu– Redifining the Slide, Soil Amendment Power, Ditch Admiration, and more.WaterShapes - Janu– Fountain Winterization, Roman Concrete and the latest from WU. ![]()
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