Investigating Calcium Sulfoaluminate (CSA) Cement and Sacrificial Anodes

Project Details
STATE

FHWA

SOURCE

RIP

START DATE

07/01/19

END DATE

06/30/21

RESEARCHERS

Arkansas DOT

SPONSORS

JD Borgeson

KEYWORDS

Bridge decks, Calcium sulfates, Hydraulic cement, maintenance, Mix design, patching, Sacrificial anodes

Project description

Calcium Sulfoaluminate (CSA) Cement is a rapid setting hydraulic cement similar to Portland cement with a very fast strength gain. If a typical Portland cement concrete mixture can reach 4,500 psi in 28 days, the complementary CSA cement mixture would reach 4,500 psi in 4 hours. Because of this extremely fast strength gain, CSA cement is an ideal material for repairs. Arkansas Department of Transportation (ARDOT) currently utilizes CSA cement for bridge deck repair, but corrosion issues tend to arise in the patched area due to several factors. One objective of this project is to evaluate the effectiveness of using sacrificial anodes when patching bridge decks with CSA cement mixtures in regards to corrosion inhibition and repair longevity. This will be accomplished by patching sections of a bridge deck with the anodes included and monitoring the corrosion and wear of the patch compared to other patches that were placed without anodes. The other objectives include: evaluating the feasibility of ARDOT using CSA cement for full depth repairs of roadways and determining an appropriate mix design for ARDOT to use CSA cement for full-depth repairs of roadways.
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