Marty O'Mara, Nox-Crete's Decorative Segment Manager, is featured in this month's issue of Concrete Contractor.
Decorative Segment Manager Marty O’Mara is showcased in the latest issue of "Concrete Contractor," as well as the latest issue of "In the Mix," a spotlight of www.ForConstructionPros.com. (Check it out here: http://bit.ly/2odVqo1.)
When South Dakota-based precast producer Gage Brothers needed an innovative solution for their production facility, they turned to Moldtech, a precast form manufacturer based in Spain and represented in North America by Nox-Crete. The result was a state-of-the-art facility with customized tilting tables, allowing Gage brothers to replicate the exact sizes and finishes their clients require.
Nox-Crete is excited to work with both companies and, in turn, be part of collaborations which help improve the technology of the precast industry.
Recent hire Rhea Gross brings accounting, administration experience to Nox-Crete team.
Nox-Crete Products Group, Inc., has named Rhea Gross as their Accounting & Administration Manager.
Gross began her role with Nox-Crete on July 8. She previously held positions as a Controller at Gallup Federal Credit Union and with Guide Rock Capital Management, both based in Omaha.
As Nox-Crete Accounting & Administration Manager, Gross will focus on guiding the company’s financial strategy with added concentration on asset preservation and financial reporting. Nox-Crete is a concrete chemical company founded in 1956 based in Omaha.
Omaha, Neb., June 18, 2019 – Lori Reid has been named President of Nox-Crete Products Group, Inc., a promotion that comes three years after she joined the team as Chief Financial Officer in 2015.
In her former CFO role with Nox-Crete, Reid focused on key metrics, development of financial and operations strategy, asset preservation and financial reporting. She has also played a key role in the company’s transition from a privately-owned, family business to an employee-owned company in 2015.
In her new role as President, Reid’s focus will shift to developing and implementing the company’s strategic vision, adapting as the industry and customers’ needs continue to evolve.
Prior to joining Nox-Crete, Reid served as Financial Controller for Advanta US (Dallas, TX), Vice President of Business Development and Administration for American Star Energy & Minerals (Amarillo, TX) and Accounting Manager for McCleskey Harriger Brazill & Graf (Lubbock, TX).
Nox-Crete CEO Michael Linn is confident that Reid’s role will help usher in Nox-Crete’s latest stage of development. Linn will retain his CEO title and assist Reid as she takes on more responsibility in her new position.
“We see this as an important change as Nox-Crete moves into its next chapter of growth,” Linn said. “We’ve moved from a family-owned business to an ESOP company. Lori’s past experience with both our company and in the business world make her the ideal candidate to help Nox-Crete continue to grow and offer customers innovative products.”
Reid views the role as an opportunity to leverage the Nox-Crete’s strong history and reputation for excellence to reach the next level.
“I look forward to building upon Nox-Crete’s solid foundation as we adapt to ever-changing market conditions and enter into the next phase of our company’s growth,” Reid says. “With our committed employee owners, superior technical expertise and industry-leading technology, we will continue to be the benchmark for providing cutting-edge solutions to our customers’ needs.”
By Destry Kenning Forming Market Segment Manager,
Nox-Crete Products Group
We have reached the end of this series, and this final article is timely, as this time of year many contractors are burdened with hardened concrete buildup on their forms. The hardened concrete makes forms heavier and can lead to more buildup. Stripping the forms takes a long time, and if the forms do not strip easily, they can be damaged in the stripping process.
Figure 1: Light buildup as a result of concrete abrading the form surface during placement.
The buildup affects the resulting wall appearance, and this can lead to a whole new set of problems.
In the last article we reviewed what causes concrete buildup on forms. You do not necessarily need to understand what causes buildup in order to remove it, but if you remove the buildup without understanding what caused it then you may find yourself with the burden of buildup immediately following your solution for removal.
You can physically remove the buildup or you can chemically remove it. Each of these processes can be accomplished by taking the forms completely out of service and removing the buildup in its entirety, or by removing the buildup on an incremental basis between pours.
There are several methods for physically removing the buildup, including chipping away with a hammer and chisel, grinding, using a rotary brush wheel or drum, or blasting the buildup with water or another abrasive blast medium. Complete physical removal requires taking the forms out of service for an extended period of time. Once the forms are cleaned, if they are aluminum, they must be re-seasoned.
The use of a hammer and chisel to remove buildup is simply not a good choice, as it can damage the forms and leave visible deformations in the resulting concrete.
Grinding can yield a similar result, as it damages the forms and leaves grinder marks that become visible in the resulting concrete.
Rotary brushes can be effective if the correct bristle composition is used, but this method is typically slow and not effective on anything other than very light buildup.
Physically removing the concrete buildup from form surfaces with water or abrasive blast media is the most common method for metal forms (aluminum and steel); and although it is the most expensive method, it is usually 100 percent effective. However, some types of blast media can pit or etch the forms, which can enhance the adhesion of any future buildup that might occur. In addition to the high cost, this process requires the re-seasoning of aluminum forms, not to mention the loss of productivity while the forms are out of service.
Figure 2: Resulting concrete finish.
Using any of these removal processes on plywood forms could potentially damage or remove the thin overlays on the form surfaces. Although concrete cannot chemically bond to overlaid plywood forms like it can on aluminum forms, it still has the capability to physically bond to the overlays. While the physical bonds are not as strong as chemical bonds, extra care needs to be exercised in the removal of buildup, due to the delicacy of the overlay laminate surfaces.
There are a myriad of processes for chemical removal, some of which are quite effective, while others are essentially ineffective on buildup – especially when the buildup is saturated with form oil or form oil reaction products.
Form oil and form oil reaction products interfere with the chemical cleaner’s ability to dissolve the buildup and, consequently, they must be removed with some type of a detergent prior to applying the chemical cleaner. Some proprietary products have a built-in detergent to eliminate the need for pre-cleaning.
This form oil needs to be removed with a detergent prior to acid cleaning, unless the acid-cleaning product contains a detergent.
Nearly all chemical removal processes utilize some type of acid to break down the buildup. Harsh mineral acids, such as hydrochloric acid (also known as muriatic acid in a diluted state), are very effective at removing the buildup, but will also remove the seasoning and are even capable of dissolving the aluminum. Because mineral acids are potentially harmful to the aluminum, extreme caution should be exercised to avoid permanent form damage.
Other, more proprietary products utilize organic acids that are still quite effective at removing buildup, but will not remove the seasoning or damage the aluminum. The downside of all acids, mineral and organic, is that their performance is largely driven
by form and air temperatures. None of these chemicals can be used at temperatures below freezing, and their performance is greatly reduced at temperatures between freezing and 50° F (10° C). For maximum performance, these products should be used in warm weather without direct sunlight exposure, which can dry out applied films before they have a chance to dissolve the concrete. Generally, all of these chemical cleaners require some degree of scrubbing and pressure washing for full effectiveness. These products are typically not cost- or performance-effective on buildup that is thicker than 0.125 inches (3.18 mm).
Lastly, there are a few chemical products available that not only function as release agents, but also as buildup removers. These products are highly reactive form-release agents that can soften and ultimately eliminate hardened buildup through repeated use, as long as you have addressed what is causing the buildup. It is best to apply this type of product to the buildup as quickly after the forms are removed as possible. This will give the product the most amount of time to soften old buildup and will prevent any new buildup from continuing to harden. Correct use of a form release agent will help eliminate buildup over multiple pours; however, it is possible to get new buildup faster than you remove the existing buildup, or to continue to develop buildup on other areas of the forms, if you do not properly address what is causing it.
As discussed in an earlier article in this series, most contractors are applying the release agent to the forms from the top of the forms – after the forms are set. This will reduce the effectiveness of the form release agent/build-up remover, and your results will be limited until your process is corrected. All clean form surface areas need light applications, and areas with buildup require heavier applications that effectively saturate the buildup. Low viscosity form release agents are most effective because they can penetrate buildup much better than thicker, or higher-viscosity, products.
Form release agents will be the most effective way to deal with buildup on plywood forms, but again, if you are unsure what is causing the buildup, then there may be no added benefit to using a product of this type. Concrete sticking to the plywood overlays can ultimately lead to the overlays sticking to the concrete upon form removal, so it is crucial to correct the cause, remove the buildup, and proceed with a process that will maximize the life of your forms.
Due to their highly reactive nature, form release agents require careful application procedures and rates.
In the end, the degree of concrete buildup, the weather conditions, how much time you have to get the forms cleaned, and how much you can afford to spend for clean-up will govern your decision on how to proceed.