... in the tertiary leak detection systems, which exist under the concrete foundation of the DSTs. However, site investigations have discovered significant reductions in wall-thickness (up to 70%) for DSTs that do not have a history of water intrusion. Furthermore, site measurements have indicated that wall-thinning...

...Abstract Electrochemical chloride extraction from a reinforced concrete structure may be accompanied with an electrochemical injection of healing agents if such agents are positively charged and are able migrate towards the activated reinforcement. Positive charge carrying nanoparticles...

...Abstract The quintessential standard for evaluating corrosion-inhibiting admixtures and their effects on a cement mix is ASTM ⁽¹⁾ C1582. This standard relies on ASTM ⁽¹⁾ G109 and ASTM ⁽¹⁾ G180 to determine the admixture's impact on corrosion rate in concrete...

... validation according to ASTM C1152. The ionic diffusion in a porous environment such as concrete is described by the Nernst-Planck equation as shown in equation (1) .[ 27 ] (1) ∂ C i b ∂ t + ∂ ( w C i ) ∂ t − div [ D i w ∇ C i + D i z i F...

...Abstract The monitoring of the open circuit potential of the reinforcement is used to identify regions in concrete structures with active processes of corrosion. For carbon steel rebars, ASTM^* C876 (2015) standard provides the correlation between the numerical value of the potentials...

...There are difficulties both experimental and conceptual in determining and defining an adequate value of D_O. Experimentally D_O is often ² measured by gas-based measurements using a slice of concrete of thickness T stabilized at a given relative humidity (RH...

...Abstract Reinforced concrete subjected to chloride exposures can have severe corrosion occurring in discreet locations. A typical repair involves removing the distressed concrete, replacing reinforcing bar if necessary and filling the hole with a cementitious repair material that is often concrete...

... of soil layers, water table level, depth of foundation mat below the ground surface, liquefaction during seismic events, and load. Differential settlement, which causes distortion (loss of form) and damage (cracking) to concrete structures, is a function of the uniformity of the soil, stiffness...

...CERL selected the two migratory corrosion inhibitors evaluated by NASA/KSC for use in the experimental project in Okinawa and issued a contract for performance by the Inhibitor Supplier. Two reinforced concrete structures, ring girders in a warehouse at the Military Port in Naha and patrol bridges...

...stainless steel reinforcement concrete rebar marine environment structure reinforcing bar chloride INTRODUCTION Stainless steels (SSs) have many characteristics which benefit construction applications, as structural usage and concrete reinforcements. ^{1 , 2} SS rebars...

... slope β_c’ was calculated by Equation (10) . Concrete specimen test in a laboratory Concrete specimens shown in Figure 5 were prepared. Dimensions of the specimen were 100 × 100 × 400 mm. Each specimen had three steel bars (Japanese Industrial Standards; JIS G4051-2016 S45C Polishing Round...

...Abstract The motivation behind this research was to determine if an iron carbonate (FeCO₃) layer can be effective for prevention of CO₂ corrosion of steel rebars, associated with production and use of carbonated calcium silicate cement-based concrete. Laboratory scale...

...Corrosion of reinforcement has been negatively affecting the civil structures in the world, causing both economic and human losses. ¹ Concrete structures are subject to contamination through pores by gases (N2, O2 and CO2) present in atmosphere and by contaminants dissolved in water...

...Abstract Surface Applied Corrosion Inhibitors (SACI) remain controversial as to effectiveness and the ability to compare materials from different manufacturers and technologies. These materials are liquids applied to the surface of concrete to control the corrosion of embedded reinforcing steel...

... S₂O₃^2- (280 mg/L); T_peak ~ 120°C). The environmental conditions around the carbon steel overpack, which are initially governed by the chemical composition of the OPC-based self-compacting concrete buffer, will evolve over the duration of the disposal period due to the ingress...

...Abstract Impressed current cathodic protection (CP) for reinforced concrete structures is a proven technology which can provide long term corrosion prevention for marine structures if properly designed and installed. This technology has been applied to a large number of concrete structures...

... with a layer of nano iron/silica particles and polyurethane. ¹³ However, its sensitivity exponentially decreased and could only be used for effective monitoring for 200 hours. LPFG sensors were also used to directly monitor the corrosion of reinforcing steel in concrete by attaching them...

... EIS, LPR, and polarization results. The advantages and limitations will also be discussed in this paper. Corrosion Concrete Inhibitor INTRODUCTION Concrete is the second most common manmade material after potable water. ¹ Nearly one cubic yard of concrete is placed per year per person...

...The results of the test program show that both OS-1 and OS-2 were effective topical surface treatments to mitigate severe chloride induced corrosion in reinforced concrete decks. The corrosion activity significantly decreased for the OS-1 and OS-2 topically treated slabs as measured by:• Reduced...

... technique. It allows quick analysis with minimum sample preparation. DART-MS was used to detect inhibitor penetration depths into the concrete interior when its surface received topical migrating inhibitor treatment. Two different concrete topical treatments were studied. One is a penetrating silane sealer...