Search
Filters
Close

Effect of Concrete Moisture on Macrocell Development in Repair of Reinforced Concrete Substructure with UHPC

Ultra-high-performance concrete (UHPC) has been introduced for reinforced concrete structures due to its enhanced mechanical performance including high compressive strengths and tensile compacity. In certain applications such as at closure joints connections and concrete repairs reinforcing steel may be embedded in dissimilar concrete elements partially incorporating the UHPC. Superficially UHPC can be considered to provide enhanced corrosion durability in marine environments due to its low permeability which would mitigate chloride-induced corrosion of rebar in the bulk material. However the localized galvanic effects of steel in dissimilar concrete in aggressive environments can be important. For example steel embedded in the concrete perimeter of repair patches can undergo premature corrosion failure after repair due to the halo effect. This research exploring the corrosion durability of steel embedded in dissimilar concretes incorporating UHPC examines the extent to which enhanced chloride transport may occur at the cold joint. The effectiveness of the bond at the concrete interface (with various levels of moisture availability at the time of UHPC repair) to minimize chloride penetration was examined. To this effect the substrate concrete was conditioned to moisture content (5% 75% 100% RH and wet) prior to UHPC repair concrete casting. Chloride penetration was accelerated by an impressed current and chloride content was assessed by concrete sampling at the cold joint as well as in the bulk concrete and potentiometric titrations.

Product Number: 51319-13474-SG
Author: Mahsa Farzad
Publication Date: 2019
$0.00
$20.00
$20.00
Also Purchased
Picture for 09216 Testing of High-Resistivity Concrete
Available for download

09216 Testing of High-Resistivity Concrete

Product Number: 51300-09216-SG
ISBN: 09216 2009 CP
Author: R. Daudistel, K. Tomosada, J. Tinnea, C. Stoll, R. Tinnea, B. Hassane and K. Kuder
Publication Date: 2009
$20.00
Picture for Port Zayed Concrete Rehabilitaion
Available for download

51312-01372-Port Zayed Concrete Rehabilitaion

Product Number: 51312-01372-SG
ISBN: 01372 2012 CP
Author: Akram Saad
Publication Date: 2012
$20.00
Picture for Corrosion of Reinforced Concrete Pipes: An Accelerated Approach
Available for download

51313-02551-Corrosion of Reinforced Concrete Pipes: An Accelerated Approach

Product Number: 51313-02551-SG
ISBN: 02551 2013 CP
Author: Francisco Presuel-Moreno
Publication Date: 2013
$20.00