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Title: Carbonation processes in submerged concrete in a simulated CO₂ invasive fish barrier system
Authors: Moser, Robert D.
Johnson, Tyler R.
Madden, Mary C.
Weiss, Charles Arthur, 1961-
Long, Wendy R.
McKechnie, Mason A.
Smith, David L.
Keywords: Concrete
Hydrogen-ion concentration
Carbon dioxide
Fish barrier
Concrete hydraulic structures
Publisher: Geotechnical and Structures Laboratory (U.S.)
Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC TR-20-2
Abstract: This study focused on examining the susceptibility of three concrete materials to carbonation-induced deterioration in a simulated CO₂ chemical fish barrier system. The concrete materials tested were modeled after concretes and aggregate mineralogies used in civil works structures. The exposure conditions consisted of 74 mg/L and 225 mg/L concentrations of CO₂ in an aqueous solution maintained at both 21°C and 40°C. Visual examination and pH indicator solutions were used to monitor the progression of any deterioration in specimens during the experiment. Surface deterioration was not observed until 90- and 180-day measurements. Characterization performed on affected materials and surface deterioration products indicated that the damage was induced by carbonation mechanisms with Ca²+ leaching from the concrete microstructure reacting with CO₂ in solution. These processes were limited to the top 1 mm of the concrete, even at 180 days with any severe microstructural alteration and changes in pH limited to 100-200 μm of depth. The primary conclusion from this Phase 1 study is that carbonation-induced deterioration can occur in the simulated fish barrier environment, but the rates of carbonation are not of concern and are similar to those that would be expected for concrete exposed to normal atmospheric conditions and CO₂ concentrations.
Description: Technical Report
Gov't Doc #: ERDC TR-20-2
Rights: Approved for Public Release; Distribution is Unlimited
Size: 71 pages / 9.468 Mb
Types of Materials: PDF/A
Appears in Collections:Technical Report

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