CoatingsPro Magazine Supplements

Concrete Dec 2017

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32 CONCRETE COVERED 2017 COATINGSPROMAG.COM Concrete and Water that has a high W/CM begins its life cycle at a disadvantage. Poor consolidation then creates planes of weakness that are further compounded by poor curing and lack of cover over the reinforcement. Not only are these latent construction defects responsible for poor concrete performance that remain hidden until deterioration occurs, they compound with the environmental exposure of concrete and inevitable damage to the structure to cause concrete to under-perform. Water Keeper As stated, water is the secret to concrete, contributing to the durability through the proper W/CM, consolidation, curing, and corrosion protection. After the concrete has been properly placed and cured, the second part of successful concrete is to keep the water out of the concrete. Nearly all deterioration mechanisms of concrete involve water being present or absent at the appropriate times in the life of the concrete, as well as water ingress being responsi- ble for property damage from leaking roofs and windows. Deterioration from freezing and thawing cycles, ingress of deleterious chemicals, corrosion, and chemical attack do not occur in dry concrete. Entire industries have developed materials to keep water out of concrete, such as coatings manufacturers, membrane applications, sealants production, water stops, and other specialty treatments. We also know that application of these protective systems requires a sound substrate and that application after deterioration initiates is usually less durable than preventative proactive measures. Maintenance and inspection can provide triggers for less expensive and more effective treatments applied before too much damage has been done. In short, keep the water in when needed for hydration, consolidation, and curing, then keep the water out for the longest life of concrete. CP Fred Goodwin, EB Const r uct ion Chemica ls Globa l Cor rosion Competenc y Center Head , is a chemist w it h 30+ years in t he const r uct ion chemica ls indust r y. He is a fel low of A STM , A mer ican Concrete Inst it ute (ACI), and Inter nat iona l Concrete Repa ir Inst it ute (ICR I), and he is an honorar y member of A STM C1 & C9. Goodw in is t he cur rent cha ir of t he ICR I Technica l Act iv it ies Committee (TAC), ACI 090 TR RC, and Societ y for Protect ive Coat ings (SSPC) 8 . 3 Commercia l Floor Coat ings. He was awarded t he A STM Award of Mer it in 2016, t he Journal of Coatings and Protective Linings' Ed itors Award (2006, 2010, and 2012), t he ACI 2011 Delmar Bloem Dist ing u ished Ser v ice Award , and St rateg ic Development Counci l — 2015 Jean-C laude Rouma in Innovat ion in Concrete Award . For more infor mat ion, contact: BA SF 's Const r uct ion Chemica ls, w w w.master-bu i lders-solut ions.basf.us/en-us Improper curing is another latent construction defect. Water needs to be present during hydration period. Without it, the result could be low strength and poor durability. Once cracking occurs in concrete, further deterioration is accelerated. Other materials can move through the cracks and potentially reach the steel rebar. Too much water in concrete can be the cause of concrete's poor performance. If the water to cementitious material (W/CM) ratio is off, it can be a problem.

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