Cement Americas

FALL 2017

Cement Americas provides comprehensive coverage of the North and South American cement markets from raw material extraction to delivery and tranportation to end user.

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www.cementamericas.com • Fall 2017 • CEMENT AMERICAS 19 FEATURE rubbers offer excellent protection from corrosion, salts, acids, alkali, and other environmental extremes. They also repair and seal cracks, laps, fasteners and pene- trations on roof surfaces. Rubberized coatings can be rolled, painted or sprayed onto a variety surfaces to form a seamless, monolithic membrane. These include: • Concrete silo roofs. • Metal buildings and roofs. • Modified bur roofs. • Grain silos and bins. • Silo exterior walls. • Single ply roofs. • Urethane foam roofs. • Steel bolted joints. One of the biggest benefits of rubberized coatings is its inherent ability to completely bond to these surfaces. Many coatings simply act as a floating membrane which allows for a greater rate of failure when compared to coating materials that bond directly to the silo surface. Thermal stability offered by synthetic rubber coatings minimizes the impact of weather extremes and ensures a long product lifetime. This high-performance coating resists peeling, cracking and splitting caused by tem- perature extremes. Coatings can be applied at lower temperatures than oth- er coating types which extends the application season. Water resistant properties of rubberized coatings begin before the product is fully dry, eliminating issues caused by wash-off in unpredictable weather conditions. Thick- ness and number of coats necessary for rubberized coatings vary depending on specific application needs. Finding a Contractor Once you know the product itself meets all the specifi- cations necessary for your precise needs, you must also consider the application process, thickness and level of company expertise. When selecting a contractor, it is ideal to choose someone with experience in preventive maintenance and repair of industrial silos. A typical coating or roofing contractor does not under- stand the nuances of silo construction. It is critical to select a company that has experience with the particular design and engineering associated with both steel and concrete silos. What to look for in a preventive maintenance company: • Proposal and documentation clarity. • Experience. • References. • Stability. • Training and safety. While the proper coating can greatly extend useful life, silos that are overly saturated with water or have exten- sive spalling, or chipping, are not always a candidate and may require resurfacing instead. When used appro- priately, however, rubberized silo coating delivers opti- mal protection for a variety of surfaces and withstands numerous environmental extremes. It is an economical solution that ensures product quality and silo safety. A qualified inspection, repair, cleaning, and maintenance company can recommend the solution that is most suited to your individual needs. Dennis Blauser is the CEO of Marietta Group, which hous- es Marietta Silos, Marietta Inspection Services and USA Silo Service. Marietta Group has spent more than a cen- tury meeting the needs of industry professionals and is the only silo contractor in the nation that provides engi- neering, design, construction, inspection, repair and maintenance in addition to silo and bin cleaning. USA Silo founder Tim Thieman has spent more than 30 years developing efficient and effective methods of silo build- up assessment, evaluation, cleaning, debris removal, site safety and project-management practices. Though new silos now use suspended cones, water leakage leads to corrosion of steel silo components regardless of silo design. This suspended cone interior and steel ring girder show extensive corrosion from failed waterproofing. Steel components are susceptible to corrosion from water penetration, though roof failure can also be caused by damage to the concrete supports. Silo roofs are supported by silo beams that rest on a thick, steel bearing plate in- side a beam pocket. In this image, spalling concrete under the plate leaves the beam at risk for failure.

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