CoatingsPro Magazine

NOV 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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COATINGSPRO NOVEMBER 2015 53 standpoint, according to Smedley. It helped that the crew only had to wear safety glasses and latex gloves. Tey wore respira- tors when dust was present, too. Temp Control and Containment Because the containments were outside and therefore open to the wind and rain, that meant that the crew had to control the conditions for the coatings installation as much as possible right from the start. In fact, the frst day on the job centered on building the containment around the concrete. (Tis added scope of work was what increased the project timeline.) According to Smedley, the ambient temperature outside was around 40° F (4.4° C), and these products needed to be kept above 60° F (15.6° C) to cure. He continued to explain that vinyl esters are made of two components: a resin and a catalyst. Some coatings use a moisture cure, but this product uses a chemical cure where instead of "drying," the coatings reach full cure when all of the catalysts have " linked " to the resins. So High Performance Systems needed to enclose the site and control the temperatures. Tey installed 2" by 4"s (5.1 cm x 10.2 cm) to build temporary walls to allow for an outside company to enclose the site with a tent. It took the frst full day of the job to get the containment built, which was 30-feet (9.1 m) long by 24-feet (7.3 m) wide by 8- to 10-feet (2.4–3.0 m) tall (depending on the area). Tey tried to keep the height of the containment as low as possible in order to control the volume of air and, therefore, the temperature better. Tey added the two portable heaters and ducting to the space at the end of the frst day, and on the second day, they started and completed the surface prep of the concrete substrate. Pour Conditions Te containments were created using an existing concrete slab; it was poured about six months before the coatings crew arrived on site, as opposed to a " fresh pour," as Smedley called it. So when the crew started to do their prep to get the right surface profle for coating adhesion and to take it to a "white" concrete, as Smedley explained, they started to notice some issues. JOB AT A GLANCE PROJECT: To coat side-by-side secondary containment systems at an environmental facility for the decontamination of soil COATINGS CONTRACTOR: High Performance Systems 436 Lincoln Blvd. Middlesex, NJ 08846 (800) 928-7220 SIZE OF CONTRACTOR: 10–15 people SIZE OF CREW: 6 crew members PRIME CLIENT: Maryland Environmental Service 259 Najoles Rd. Millersville, MD 21108 (410) 729-8200 SUBSTRATE: Concrete CONDITION OF SUBSTRATE: New but poured ~6 months prior SIZE OF JOB: 1,500 sq. ft. (139.4 m²) DURATION: 4 days UNUSUAL FACTORS/CHALLENGES: » Materials needed to be able to resistant concentrations of hexavalent chromium, a pH of 14, direct sunlight, and hot and cold weather » Open jobsite required containment and heating » Access to the site required security escorts MATERIALS/PROCESSES: » Enclosed site with temporary walls and containment » Prepared substrate to NACE No. 6/Society for Protective Coatings (SSPC) Surface Preparation (SP) 13: Surface Preparation of Concrete with grinders » Used trowels and epoxy gel scratch coat to correct bug holes, divots, cracks, etc., on walls » Brush- and roller-applied the Corobond primer at an average thickness of 5–6 mils (127.0–152.4 microns) » Brush- and roller-applied the Magnalux 404 FF coating at an average thickness of 20–30 mils (508.0–762.0 microns) with a fiberglass aggre- gate SAFETY CONSIDERATIONS: » Used ventilation in the containment » Wore safety glasses and latex gloves » Wore respirators when dust was present Safet y was a priorit y on this jobsite — inside and out. The crew used ventilation into the containment and had to be escor ted by securit y to gain access to the jobsite.

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