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Update on the Evaluation of Grout Robustness and Corrosion by Accelerated Corrosion and Rapid Macrocell Testing

Product Number: 51321-16339-SG
Author: Samanbar Permeh/Rutambara Sonawane/ Kingsley Lau/Matthew Duncan/Ron Simmons/
Publication Date: 2021
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Severe corrosion of steel strand and tendon ducts in association with physically and chemically deficient grouts were documented in Florida bridges utilizing prepackaged thixotropic grouts. Testing to evaluate grouts for their corrosion protection has been implemented for material specifications; however, available methodologies do not consider the effects of grout deficiencies that can form. Testing to assess grout robustness by developing physical and chemical deficiencies to identify performance limits have been recently considered by industry and state transportation departments.  It was the interest of this work to identify corrosion testing methods that would account for grout physical and chemical deficiencies. Experimental testing using a modified accelerated corrosion test and a modified rapid-macrocell test was conducted for three grout materials mixed and cast under non-ideal conditions (grout pre-exposure and grout mixed with 10% excess mix water) to promote material deficiency to assess the suitability of the laboratory test methods for use in practice. 

Keywords: Grout, Post-Tension, Corrosion, Deficient, Bridge, Accelerated Corrosion Test, Rapid Macrocell Testing

Severe corrosion of steel strand and tendon ducts in association with physically and chemically deficient grouts were documented in Florida bridges utilizing prepackaged thixotropic grouts. Testing to evaluate grouts for their corrosion protection has been implemented for material specifications; however, available methodologies do not consider the effects of grout deficiencies that can form. Testing to assess grout robustness by developing physical and chemical deficiencies to identify performance limits have been recently considered by industry and state transportation departments.  It was the interest of this work to identify corrosion testing methods that would account for grout physical and chemical deficiencies. Experimental testing using a modified accelerated corrosion test and a modified rapid-macrocell test was conducted for three grout materials mixed and cast under non-ideal conditions (grout pre-exposure and grout mixed with 10% excess mix water) to promote material deficiency to assess the suitability of the laboratory test methods for use in practice. 

Keywords: Grout, Post-Tension, Corrosion, Deficient, Bridge, Accelerated Corrosion Test, Rapid Macrocell Testing

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