CoatingsPro Magazine Supplements

Concrete Dec 2018

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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10 CONCRETE COVERED DECEMBER 2018 COATINGSPROMAG.COM Concrete Proof SPONSORED CONTENT (ICRI), NACE International, and the Society for Protective Coatings (SSPC), are also available to provide guidance on standards and best practices. ese organizations also offer training and education resources relevant to contractors. In addition to basic PPE, contractors may also need to research potential access solutions during the planning phase, such as the need for ladders or scaffolding to reach an elevated jobsite. "We recommend a pre-job meeting between the [coatings] contractor or applicator, the people mixing [the concrete], and the owner of the jobsite to coordinate and make sure that everyone is on the same page," advised Rust-Oleum's Stanley. "Having good team dynamics and coordination will definitely make for an easier and safer application. Map out every phase of the application rather than figuring it out as you go." Managing Moisture Once a plan is in place, one of the first things contractors should be mindful of is the complex relationship between concrete and water. ough water is added to the cement, sand, and aggregate mixture to form a bond, it is crucial for the construction water to have evaporated enough to allow the substrate to receive new coatings, which can be sensitive to moisture. "Moisture is one of the most frequent causes of coating failure as well as construction defects," said Sherri B. ompson, marketing manager at e Paul N. Gardner Company (GARDCO). "Applying paint to a substrate that is too moist will frequently lead to failure of the film. Most substrates that absorb water have to be below a specific moisture level percentage before paint can be applied. A moisture meter is an ideal quality control tool to determine whether a substrate is ready to be coated." "e concept of properly drying a jobsite is vital to the success of a time-critical construction project," added Greg Slusser, marketing manager at heating, ventilation, and air conditioning (HVAC) rental solutions firm Temp-Air. "Concrete slabs retain water from sources such as groundwater and resid- ual water from the mixing process. Controlling moisture in slabs prevents adhesive bonding issues during floor installa- tions. Improper concrete slab moisture levels may also result in flooring discoloration and even the growth of microbials." To test moisture levels, Gardco offers its m100 and m200 products as pin-type penetration meters. ese meters operate on the princi- ple of electrical resistance by using the substrate as a circuit element, driving two pins — or electrodes — into the material. "e water in the sample material is an excellent conductor, and most dry substrates are effective insulators," ompson explained. According to Ronan Carrigy, marketing manager at Tramex Moisture Meters, an optimal strategy is to combine in situ relative humidity (RH) testing, as per the ASTM F2170 standard, with nondestruc- tive (NDT) moisture testing, as per ASTM F2659. e CMEX2 concrete moisture meter from Tramex is one example of a product that complements tradi- tional probes. "Nondestructive moisture testing, as per ASTM Organizations and associations, such as American Concrete Institute (ACI), offer industry guidance through standards and best practices for contractors working with concrete. Not all tools need to penetrate to check moisture. Tramex, for example, offers a non-invasive moisture meter that can be used for nondestructive ( N DT ) m o i s t u r e t e s t i n g . T h i s c a n complement a traditional probe. Several tools can be used to determine moisture levels in concrete, such as The Paul N. Gardner Company's penetration meters.

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