MAPEI Corporation has expanded its portfolio of high-performance admixtures with the introduction of Mapefibre ST 50 Twisted, a state-of-the-art macro-synthetic fiber designed to enhance the durability, strength, and performance of conventional concrete, pre-cast concrete, and shotcrete applications.
Composed of a specialized blend of polypropylene and polyethylene resins, Mapefibre ST 50 Twisted provides superior reinforcement by increasing concrete’s ductility, tensile strength, and residual strength—ensuring long-term durability even in the most demanding environments. Unlike traditional steel reinforcement, these synthetic fibers do not corrode, making them ideal for use in aggressive environments where resistance to alkalis and moisture-induced deterioration is critical.
“With Mapefibre ST 50 Twisted, we’re delivering a next-generation fiber reinforcement solution that improves performance while offering significant cost and labor advantages,” said Andrew Fulkerson, MAPEI Corporation’s Product Line Manager for Admixtures for Concrete. “By reducing plastic shrinkage, cracking, and the need for welded wire mesh or rebar in certain applications, this fiber provides contractors with a more efficient, reliable, and durable concrete solution.”
Engineered for Versatility and High Performance
Mapefibre ST 50 Twisted meets industry standards, including ASTM C1116-03, ASTM D7508/D7508M-20, and ACI 360 R-10. This makes it suitable for a wide range of applications, including:
- Industrial and warehouse slabs-on-ground
- Composite metal decks
- Bridge decks
- Concrete pavement and overlays
- Shotcrete applications
It is also ideal for precast applications such as septic tanks, burial vaults, pipes, and panels.
“Concrete reinforcement technology continues to evolve, and Mapefibre ST 50 Twisted represents the next step in improving performance, reducing material costs, and enhancing ease of use,” said Gerald LaPier, MAPEI Corporation’s Director of Construction Chemicals. “This fiber solution is engineered for even distribution within the concrete mix, providing reinforcement from the top to the bottom of slabs, reducing thermal expansion and contraction effects, and extending the life of the structure.”
Mapefibre ST 50 Twisted offers multiple advantages that make it a superior choice for concrete reinforcement:
- Corrosion resistance ensures durability even in harsh environments.
- Lightweight nature and ease of handling allow for seamless integration into the mixing process.
- Special surface treatment enhances bonding with the cementitious matrix, improving overall concrete performance.
- Cost efficiency—reduces material costs compared to welded wire mesh (WWM) and some rebar applications.
- Minimized plastic shrinkage and cracking for stronger, longer-lasting concrete.
- Shotcrete efficiency—significantly decreases equipment wear, rebound, and material waste compared to steel fibers, optimizing jobsite productivity.
Sustainable, Efficient, and Built for the Future
By replacing traditional steel reinforcement in various applications, Mapefibre ST 50 Twisted contributes to more sustainable construction practices by lowering overall material usage and reducing the environmental impact associated with steel production. Additionally, its ease of use and enhanced performance characteristics make it a smart choice for contractors looking to improve both efficiency and durability on the jobsite.