Precast Wall Panels Part of Blast Resistant Facilities: Part 1

Precast Wall Panels Selected for $50M Project

In 2016, Mid-States Concrete joined the team undertaking a $50 million expansion project at LyondellBasell in Clinton, Iowa.

The expansion would include administrative offices, a control room, laboratory, and maintenance shop. The LyondellBassell plant manufactures ethylene, the world’s most widely used petrochemical. It also converts ethylene into polythylene plastic resins which serve as building blocks for various products such as leak proof and shatter proof containers for industrial and household chemicals, packaging that protects foods, and children’s toys that are safe and durable.

Mid-States manufactured and installed 165 Wall Panels (totaling more than 44,000 square feet) for the project, which was completed in 2018.

Bush Construction served as the General Contractor on the project. Director of Construction Ryan Welborn said the team considered both tilt-up and precast wall panels for this project, ultimately choosing precast and welcoming Mid-States to the project.

”The precast wall panels were selected as primarily a speed decision and a quality control decision - just a logistics deal,” Welborn said. “We had two options. We could either do tilt-up or precast and from all the things I just mentioned, precast seemed like a significantly better option.”

One of the things that made this project unique is that it’s a facility that works with explosive materials.

”The idea was that they were creating a building that could withstand a blast if something ignited outside,” Welborn said. “It could essentially protect everybody inside the building. It was a way for them to provide further protection for the team.”

Welborn said this is a project that everyone involved should be proud of, as it really was unique. Benefits he found working with precast wall panels include the fast installation process, which takes up much less space on a jobsite than alternatives, like tilt-up. It was also cost-effective, as his team always looks for the most cost-effective package to present to the owner.

In the future, Welborn said he would continue to utilize precast concrete, so long as it is the most cost-effective option. The quicker onsite process, quality control and safety aspects make it an attractive option.

While there is no denying the project came with its challenges, as most don’t have a ton of experience working with blast resistance requirements, Welborn was pleased with the Mid-States team’s ability to keep on top of the design aspect of wall panels.

Precast Wall Panels Beat the Competition

The Glenroy Expansion Project in Menomonee Falls, Wisc. featured 84 insulated wall panels.

By Tara Loomis, Senior Structural Engineer & Stephanie Kohl, Marketing

Precast concrete has continued to grow in popularity due to its efficiency, strength, and durability. Precast wall systems offer many benefits over conventional systems such as cast-in-place or tilt-up wall systems.

Precast walls are built in a controlled environment, therefore the key factors which regulate the quality of construction, such as curing, temperature, mix design, and formwork, are closely monitored when manufacturing precast walls, ensuring quality and strength.

Tilt-up walls and CIP are cast on the jobsite, where weather can often delay casting and extend the project schedule. Additionally, the curing environment is not controlled, and extreme weather can cause the concrete to have strength issues. Since precast concrete wall panels are manufactured indoors in quality-controlled facilities with their own batch plants, production is not delayed due to weather.

As precast walls are transported to the jobsite as needed, site constraints are generally not an issue for precast either. The same can’t be said for CIP or tilt-up wall systems, as jobsite space is needed for both casting and curing. CIP walls are labor and time intensive, although they do offer great versatility. CIP requires contractors to first construct forms for the walls, then install necessary reinforcement and concrete mix. Pouring concrete and waiting to remove forms takes time, which extends the length of the project.

Precast wall panels can be insulated and composite. These wall panels are energy efficient and lighter in weight. They use less concrete and more insulation to reduce energy use and lighten the panel. The composite action offers superior load-bearing capacity while using less concrete. These walls reduce energy consumption of buildings. Precast wall panels offer long-term viability and flexibility. Walls can be easily changed, expanded, and removed with ease. Due to its modular design, the repurposing of a precast wall panel is also possible with minimal complexity.

Western Building Products in Germantown, Wisc. featured 277 wall panels and 2,200 square feet of hollow core.

“Benefits of precast include energy performance and physical durability as well as economy of cost,” said Mike Miksich, LEED AP BD+C, Vice President of Briohn Building Corporation. “Our projects benefit from an expedited installation of the exterior wall with precast versus other exterior finish materials.”

Briohn Building Corporation has partnered with Mid-States Concrete Industries on several industrial projects in recent years, including Western Building Products in 2019, which included 277 Wall Panels and 2,210 square feet of Hollow Core; Glenroy Expansion in 2020, which included 84 Wall Panels and 17,782 square feet of Hollow Core; and Westminster II in 2020, which included 201 Wall Panels.

”Mid-States panels receive a lot of compliments for how well they look on our projects,” Miksich said. “We’ve been pleased with the high quality of panels received. In addition, the engineering and management teams at Mid-States are responsive and thorough, which is just as important as panel aesthetics.”

Miksich said the common reasons precast concrete wall panels edge out the competition on his projects are cost and schedule. With precast wall panels, he gets exterior walls fully erected in a short timeline on projects that are extremely schedule sensitive.

Proud Partner of The Lincoln Academy

Photos courtesy of Corporate Contractors Inc.

Built from the ground up with input from the community – including parents, community, civic leaders, and, most importantly, scholars – access and equity drives The Lincoln Academy as an innovative, high quality public school option focused on scholar success, according to the website of the brand new school which will end its first school year on June 14.

Chief Education Officer of The Lincoln Academy Kristi Cole said the school had a fantastic first year focused on career exploration, academic rigor, and character development.

“The best part of the school year for me I think and for the school is the scholars’ energy and excitement they bring to learning,” Cole said. “Whether I’m upstairs in an engineering lab and they are learning to program a CNC machine, or learning to create a robot, or the art club learning how to make stained glass – just watching them be excited to be learning about whatever it is they are doing. That’s the best part - when you see that joy of learning and excitement about being at school.”

To get the school up and running for the 2021-22 school year, Corporate Contractors Inc., the general contractor on the project, had to take off at a run.

“We enjoy being part of projects that are bigger than ourselves,” said CCI Project Manager Aaron Combs. “It’s really going to transform lives and it’s going to pick up where maybe the school districts are failing. It’s really going to transform scholars’ lives. It’s going to give them a future beyond anything they ever saw possible.”

The school was actually started based on community input and a desire for another option for a public school. Over the course of many meetings with parents and the community to determine what needs the school could meet, The Lincoln Academy, its pillars, and curriculum were created.

“Our goal is to be able to help build strong character in our scholars, strong academics, and a willingness to support their community,” Cole said.

The 2021-22 school year included about 400 scholars in grades K4-2nd and 6th-9th, with a plan to add one grade level per year until the school reaches 700 scholars. Every scholar has an individualized learning plan that focuses on what they want to be and how they are going to get there.

Precast concrete wall panels were used to create the gymnasium at the center of the building. A wood grain form liner with reveals and smooth form finish on the upper portions were used to provide a pleasing aesthetic finish. The wall panels will maintain their look and durability for generations to come.

“One of the most important things for us is to be involved in our community,” said Jeremy Olivotti, Mid-States Concrete’s Vice President of Preconstruction. “An opportunity to be part of a project where people work, learn, and play gets us very excited.”

Combs noted one of the major challenges of this project was its tight timeline.  The project was completed in just 11 months. Because precast bears the floors and the ceilings, it provided a quick solution to get the building up as quickly as possible. The form liner helped elevate the area from just a supporting structure to a focal piece.

“This project was installed on schedule for CCI,” said Mid-States Concrete Project Manager Brad McCaslin. “We mobilized early to set what wall panels had been produced for their groundbreaking ceremony. It was important that we be there for the groundbreaking ceremony to show progress. Up until that time, the jobsite was nothing more than a hole in the ground. CCI has been a great partner with us and we wanted to do everything we could to get there as soon as possible.”

In addition to the quick installation helping keep the project on schedule, use of precast concrete also provided the benefit of offering clean construction.

“You walk in to a clean site, you put the walls up, and you walk out,” Combs said. “It’s a simple installation process; it’s clean; it’s not something that’s going to mess up a site. It was a two-day install and at the end of the day, it was the perfect application.”

Combs added the safety aspect of Mid-States Concrete was another benefit as precast contributed to a safe job site and that isn’t something you can put a dollar figure on.

In the upcoming school year, The Lincoln Academy will focus on continuing to fine-tune its systems and individualized support for the school’s scholars to make sure they are reaching their goals. The school will also focus on continuing to build its career exploration pathways, now that the scholars have expressed their interests and goals.

“Every decision we make is about children first,” Cole said.

Precast:
38 Wall Panels (18,834 square feet)
Wood grain formliner inside the gymnasium

Partners:
GC: Corporate Contractors Inc.
Architect: Eppstein Uhen Architects

Further Reading:
The Lincoln Academy

Photos courtesy of The Lincoln Academy.

Hollowcore: A Versatile Product for Many Purposes

Hollowcore plank is one of the most popular, efficient, and versatile components in the construction industry offering architectural and structural design flexibility.

Typically used in the construction of floors, and sometimes roofs, in multi-family residential, commercial, educational, healthcare, and industrial buildings, one of the huge draws of the products is its long spanning capabilities.

While the design recommendations for span lengths vary slightly from product to product, there are a few general rules to keep in mind, according to the Precast/Prestressed Concrete Institute (PCI). If we assume a uniform superimposed load of 100 pounds per square foot and an un-topped system, spans can range up to 50-foot depending on the depth of the plank. Factors such as line loads, concentrated loads and openings can affect the span capabilities of the system.

Benefits of using precast hollowcore plank on bearing wall structure include vibration resistance, easy floor penetrations, finished ceilings and floors, reduced floor-to-floor heights and open clear spans providing more open interior space than with conventional construction.

Hollowcore is inherently fire-resistant, and can achieve a fire rating of up to four-hours, depending on thickness, topping, and strand cover. The product is highly durable and boasts thermal properties which help reduce consumption for heating and cooling of buildings. Hollowcore plank is also highly resistant to changing weather conditions and is efficient in noise reduction, which makes it an ideal noise barrier.

Our team has the experts you need to assist with layout from early schematic design through project submittal, as well as storage, product delivery, erection, field welding, and attachments.

Sources:
Why use hollow core?
Hollowcore FAQs
The Unsurpassed Benefits of Using Precast Concrete for Multi-Family Housing