https://www.prnewswire.com/news-releases/americas-cement-manufacturers-salute-president-trumps-call-for-15-trillion-in-infrastructure-investments-support-swift-congressional-action-300591276.html

WASHINGTON, Jan. 31, 2018 /PRNewswire-USNewswire/ -- The Portland Cement Association (PCA), representing America's cement manufacturers, lauded President Donald Trump's call for $1.5 Trillion to be invested in revitalizing the nation's infrastructure, and urged Congress to take swift legislative action to fully fund and sustain projects now and into the future.  Cement is the core ingredient in concrete, which helps make American highways, bridges, runways, water systems and river networks safer, more durable and longer lasting.

Corrosion resistance of chromium‐steel and stainless steel reinforcement in concrete

Andrew Fahim 

Alyson E. Dean 

Michael D. A. Thomas 

Edward G. Moffatt

First published: 14 February 2018

https://doi.org/10.1002/maco.201709942

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Abstract

This paper presents results of a study conducted to determine the corrosion‐resistance of chromium‐steel (ASTM A1035 steel) and several stainless steel grades (316LN, 304, 2205, and XM‐28), as concrete reinforcements. The study included laboratory experiments investigating the reinforcements’ performance in a concrete pore solution containing chlorides, with and without wetting and drying cycles, as well as in cases of cracked and uncracked concretes exposed to chlorides. The study also included field‐exposure experiments, where reinforced mortar bars and bare bars were exposed to a marine tidal environment. Results indicated that the service‐life enhancement provided by these reinforcements was highly dependent on their alloy composition. ASTM A1035 steel was found to be less corrosion‐resistant than all stainless steel grades, due to the lower alloy contents. XM‐28 was also found to have a substantially lower corrosion resistance compared to other stainless steels, due to the incorporation of manganese, coupled with the lower nickel content.

Finally, 304, 316LN, and 2205 reinforcements showed no signs of corrosion onset in all experiments, even in cases of cracked concrete.

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http://www.metforce.com.au/assets/pagesdocuments/difference-between-304-316-and-220517.pdf

What does it contain? 304 316 2205 (min %)

Chrome                     18% 16% 21%

Nickel                         8% 10% 4.5%

Molybdenum -                   2% 2.5%