Performance Reinforcing Steel to Defy Corrosion & Extend Service Life of Structures

Description:
Chloride threshold, corrosion rates, concrete mix designs, concrete cover, environmental conditions, and weather are some of the parameters used for many years in establishing theoretical life cycle modeling and time to first repair. New research that we will be discussing and started investigating on the performance of different metallic and non-metallic reinforcements in real life environmental conditions. We will review our research into the overall behavior of the “concrete/rebar system” under simulated harsh environments while under loads, considering the corrosion resistance characteristics as well as bond, cracking, deflection, ductility and ultimate capacities of the “concrete/bar systems”, concluding that the “Concrete/ChromX 9100 system” outperformed other “concrete/CRRs systems” in the overall performance. These research studies have been performed by the University of Calgary, the University of Rutgers, and the University of Akron. 

From the design standpoint, it took approximately 20 years to get to the point where we are today. ACI 318-19 is the building code requirement for structural concrete, and this is the first version that allowed the use of 100 ksi in the design. The new ACI code allows several steel grades to be used interchangeably in design up to 100 ksi for confinement.  

100 years to the first repair. That’s the product service life of ASTM A1035-CS, an uncoated corrosion resistant and high strength concrete reinforcing steel. A1035-CS concrete reinforcing steel exceeds project needs with innovation and precision and can be handled and fabricated like conventional rebar without the risk of damage, repair, or inspection issues. For 60 years’ service life to first repair in infrastructure projects (AASHTO definition), ASTM A1094 is a continuously galvanized rebar with a zinc alloy coating that provides the well-known corrosion protection of zinc and the added benefit of exceptional formability.

About Our Speaker:
Hans Geber, Technical Product Manager, CMC Performance Reinforcing Steel.  Hans has over 20 years of practical hands on experience in various steel industry managerial positions in Europe and the US, both upstream with meltshops and rolling mills, as well as downstream with steel service centers and commercial networks, all in the stainless steel and specialty steel industry.  Hans has joined COMMERCIAL METALS COMPANY in early 2018 and has since been working in various roles, most recently as a Technical Product Manager for CMC Performance Reinforcing Steel Group, educating engineering consultants, DOT’s, contractors as well as rebar fabricators on choosing the right corrosion resistant steel, which would help them defy corrosion, mitigate congestion issues and extend the service life of their structures, all while saving valuable taxpayer dollars.