CoatingsPro Magazine

MAY 2015

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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Page 40 of 92

40 MAY 2015 COATINGSPROMAG.COM strength and may be more difficult to prepare. Hard concrete may have metallic, emer y, or trap rock toppings that make them ver y difficult to perform proper surface preparation to. Soft concrete w ill result in a deeper surface profile and subsequently w ill require more materials and/or labor to properly coat. Poorer bond strength and higher permeability may result in premature coating failures. Contaminants can be one of the most d if f icu lt things to identif y when per for ming a concrete f loor sur vey. Oi ls and lubr icants are genera l ly easi ly spotted. Si licones, chemica ls, and f loor maintenance products a lot of times are not v isible. T hese products can have a detr imenta l ef fect on f loor coatings. Some food products and ing red ients w i l l react w ith coatings as wel l. With oi ls and lubr icants, you need to deter mine the depth of contamination into the concrete. T he problem is amplif ied on porous concrete where ag g ressive remova l methods may be required. Si licones and chemica ls are ver y hard to spot as their foot pr ints are not v isible. Ask facility operators what chemi- cals are in use. T here are a number of f loor maintenance products on the market. T hese products range from alkaline cleaners to wa x/oil sealers. Shot blasting w ill not remove all of these products and may drive some of them deeper into the concrete. Maintenance personal w ill be able to tell you what products are in use. Food manufacturing facilities use a lot of vegetable and animal oils. Even if the products are not used for production, they can still be present in machin- er y as substitutes for hydraulic oil. Epoxies do not stand up well to lactic acids, which are quite common in dair y facilities. Existing repairs should be inspected for soundness and compat- ibility to the coatings to be applied. Tapping lightly with a hammer on and around repairs will tell you if they are sound. A hollow sound indicates a weak patch. A lkali silica reaction (ASR) is a chemical reaction that takes place with some aggregates and cement paste. It is identifable as popped concrete. Spalled and delamination are surface defects in concrete foors that are generally easy to identify. Spalled Inspector's Corner Wr i te in Re ad e r In q u ir y #170

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