The world’s best engineered bridges, roads and building structures start with ChrōmX 9100, formerly MMFX2, independently tested and proven to be 5 times more corrosion-resistant than conventional steel.
The answer to corrosion problems caused by:
- De-icing salts and chemicals
- Marine environments
- Aggressive soils composition
- High humidity
- Severe daily temperature swings
Specifying ChrōmX 9100 concrete reinforcing steels resolves concerns about declining service life and spiraling life-cycle costs for bridges, highways and other commercial grade structures due to harmful corrosion.
Structures built with ChrōmX 9100 rebar deliver:
- Over 100-year service life
- Lower life-cycle costs
- Lower costs compared to stainless steel
- Superior corrosion protection compared to black steel, epoxy coated rebar and galvanized rebar
Reinforced concrete corrosion begins when the chloride concentration at the reinforcing steel surface reaches a critical chloride threshold value (CT). Once corrosion is initiated, progressive cracking and spalling of the concrete follow, based on the corrosion rate (CR) of the reinforcing steel. Deterioration of the structure continues until the structure’s service life is ended.
DAMAGE ACCUMULATION PROJECTION FOR BLACK STEEL VS. CHROMX 9100 STEEL REINFORCEMENTS
Competing corrosion products such as epoxy-coated rebar (ECR) offer little corrosion protection based on actual field studies. Stainless steel rebar provides favorable corrosion-resistance properties, but the high upfront cost typically makes it an uneconomical option, as shown below.
LIFE-CYCLE COST ANALYSIS (LCCA) BASED ON 100-YEAR SERVICE LIFE (NPV $/ft2)*
|Reinforcement Type||CHROMX 9100||Black Bar
|Gr. 60||Gr. 75||Gr. 100|
|Life Cycle Cost (NPV $/ft2)**||$14.40||$11.28||$8.64||$20.14||$17.79||$14.86||$30.36|
* Reinforcing Steel Comparative Durability Assessment and 100 Year Service Life Cost Analysis Report, Tourney Consulting Group, LLC, May 2012.
** Current estimated costs include direct in-place costs plus repair costs, if applicable, assuming typical bridge application with minimum coverage 1.5 in (37.5 mm).
Costs exclude indirect and road user costs during construction and repair.