The ingredients used to manufacture Cor-Tuf UHPC are approximately 80% the same as traditional concrete. It is what goes into the remaining 20% that makes Cor-Tuf unique and innovative.
Using prestressed solutions, integrated fibers are added to the concrete mix. The fibers vary from polyester to fiberglass bars, basalt, steel, and stainless steel. Each of these integrated fibers create a progressively stronger end product, with steel and stainless steel delivering the greatest gains in strength.
Cor-Tuf UHPC has 10 times the compressive strength of traditional concrete. Additional mix techniques can be applied to achieve 50,000 psi or higher.
Our team of experts arrives on-site and mixes Cor-Tuf UHPC in real-time to ensure you get the highest quality of this new concrete technology. Strict quality control measures are followed to ensure the excellence of the final product.
Cor-Tuf UHPC initially hardens in two to three hours and can be handled in about eight hours following a pour. The cure time varies with temperature and humidity, but generally produces half-strength in five to seven days. Full curing is obtained in 28 days. Additional strength can be achieved with the use of supplemental techniques such as the use of increased temperature, steam, or both during curing.
- Longer useful life (estimated longevity of 50-75 years versus 15-25 years for traditional concrete)
- Aggressive environmental resistance (impervious to water)
- Lighter weight (concrete wall panels designed with UHPC are 25% to 33% thinner, requiring less material and footing requirements)
- Impact resistant
- Dimensional stability
- Freeze/thaw resistant
- Moisture resistant
- Chemical resistant
- Reduced maintenance
Cost savings is another benefit of Cor-Tuf UHPC. While Cor-Tuf UHPC requires a larger upfront cost when compared to traditional concrete, this new concrete technology delivers a much lower lifecycle cost. Less material is required for construction projects, resulting in a lower gross weight. This reduces the size and complexity of footing and support requirements.
Construction can be completed more quickly with prefabricated UHPC elements, delivering cost savings in several areas of construction. The extended longevity of Cor-Tuf UHPC virtually eliminates maintenance costs and drastically extends the life of the product. When the cost of Cor-Tuf UHPC is spread out across the life of the product, it has extensive cost benefits over standard concrete.
UHPC has demonstrated a durability and resistance to natural forces not seen in previous concrete products. A study of untreated UHPCs (similar to Cor-Tuf) were conducted by the University of New Brunswick, Canada. The samples were placed at the mid-tide level of a marine exposure site in 1995. The results showed the samples were impervious to water, had negligible surface damage, and had resisted 12 years (now more than 20 years) of more than 1,000 freeze/thaw cycles and storms.
The U.S. Federal Government and many state governments are strongly recommending that UHPC be used in a variety of highway infrastructure projects, ranging from accelerated bridge construction, bridge repair and maintenance, precast concrete deck panels, and field-cast connections between prefabricated bridge components.
The U.S. Department of Transportation Federal Highway Administration (FHWA) also advocates the use of UHPC through its Every Day Counts (EDC) program. EDC identifies and utilizes innovative technologies to reduce project timelines, increase safety, reduce traffic delays, and lessen the environmental impact of construction at the state and local levels.
Every two years, the FHWA works with state and local transportation departments, governments, and other vested parties to identify the latest innovations to support. The EDC-3 Innovations for 2015-2016 and the EDC-4 Innovations for 2017-2018 include the use of UHPC connections for prefabricated bridge elements and systems (PBES), making it a favored concrete technology for these applications.