Experimental Examination of Electrical Characteristics for Portland Cement Mortar Frost Damage Evaluation

Wang, Yi; Ueda, Tamon; Gong, Fuyuan; Zhang, Dawei; Zhao, Wang

doi:10.3390/ma13051258

Cited by 6 publications

(4 citation statements)

References 48 publications

(112 reference statements)

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“…Combined with the current measured by a multimeter, the electric resistivity of sodium polyacrylate polymer could be determined, it was 3.2 Ω·m. The resistivity of the material used here is much smaller than that of concrete, which is more than 60 Ω·m 27–29 …”

Section: Methodsmentioning

confidence: 98%

Spatial characteristics of stray current corrosion of reinforcing bars in pseudo concrete

Peng

Zhao

Gong

et al. 2022

Structural Concrete

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This paper focuses on the spatial characteristics of reinforcing‐bars corrosion under stray current. In the study, a corrosion experiment using a specimen with three steel bars embedded in pseudo concrete was carried out, the distribution of corrosion was obtained by three‐dimensional scanning. Further, a numerical model with the same dimension of the specimen was simulated to explain experimental results. The distribution of electric field driven by stray current was discussed in detail. Results show that by observation through the transparent matrix and by three‐dimensional scanning, the distribution of corrosion could be estimated qualitatively and quantitatively. Additionally, the spatial characteristics of corrosion state under stray current could be realized by the numerical simulation which combines polarization reaction with an extra stray current field. The stray current field around reinforcing bars was uneven in the cross‐sectional plane, leading to the difference of corrosion rate, which reflects the strong positive correlation between the field and corrosion rate.

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Section: Methodsmentioning

confidence: 98%

Spatial characteristics of stray current corrosion of reinforcing bars in pseudo concrete

Peng

Zhao

Gong

et al. 2022

Structural Concrete

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“…The appropriate pore structure in concrete is one of the main aspects of frost resistance concretes [ 56 , 57 ]. Air pore distribution tests were performed according to EN 480-11 [ 58 ].…”

Section: Methodsmentioning

confidence: 99%

Ilmenite Mud Waste as an Additive for Frost Resistance in Sustainable Concrete

Chyliński

Kuczyński

2020

Materials

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Sustainable development leads to the production of building materials that are safer for the environment. One of the ways to achieve sustainability in materials is the addition of industrial wastes and by-products, especially to concrete. However, the addition of waste to concrete often decreases its durability and the scope of aggression of the environment in which the concrete is used has to be reduced. Making sustainable concrete, which is also durable in more aggressive environments, is rather difficult. This article presents the results of tests performed on concrete containing ilmenite mud waste from the production of titanium dioxide, which was exposed to frost aggression with and without de-icing salts. The results have shown that a sustainable and frost resistant concrete can be made. After 200 freeze–thaw cycles, the compressive strength of the tested concretes decreased by less than 4%. Concretes were highly resistant for scaling and after 112 freeze–thaw cycles in water with de-icing salt, the scaled mass was less than 0.02 kg/m2. The air void distribution has also been analyzed. The results suited the requirements for frost resistance concrete and were similar to those obtained for a reference concrete with fly ash. The examination of the microstructure using scanning electron microscopy (SEM) has not shown any potential risks that might affect the durability of concrete. Particles of waste were thoroughly combined in the binder and some of its constituents seem to be an active part of the cement matrix. Long-term tests of shrinkage (360 days) have not shown any excessive values that would differ from the reference concrete with fly ash. The presented results have shown that sustainable concrete containing ilmenite mud waste from the production of titanium dioxide might also be resistant to frost aggression.

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“…changes [46]. It is expected that the reduction of electrical resistivity in X-direction mostly depends on NaCl solution penetrated in pores of mortar and aggregates.…”

Section: Electrical Resistancementioning

confidence: 98%

“…Reviewing the results of UPV tests and SEM images in this study indicate that the reduction in electrical resistivity is not related to a physical mechanism. Although accessible papers regarding the effect of freeze-thaw cycles on electrical resistance are very limited in the literature, generally, the electrical resistance decreases with frost damages of concrete under abrupt temperature changes [46]. It is expected that the reduction of electrical resistivity in X-direction mostly depends on NaCl solution penetrated in pores of mortar and aggregates.…”

Section: Electrical Resistancementioning

confidence: 99%

Deicer Salt-Scaling Resistance of Concrete Using Recycled Concrete Aggregates Pretreated by Silica Fume Slurry

2022

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Concrete wastes such as recycled concrete aggregates (RCA) make up a significant part of construction and demolition waste (C&DW) which can be used to minimize usage of natural aggregates and reduce carbon footprint. This paper studies the salt-scaling resistance of recycled aggregate concrete produced with pretreated RCAs. The test method for evaluating salt-scaling resistance in concrete according to DIN EN 1340: 2003 was performed. Four series of concrete mixes using natural aggregates, RCAs, manually pretreated RCA, and modified RCA in a desiccator were subjected to the different tests in terms of bulk electrical resistance in two directions (X and Y) before and after freeze-thaw cycles, ultrasonic pulse velocity, and weight loss of the surface layer of concrete specimens. Moreover, Scanning Electron Microscopy (SEM) of mixes was conducted and the microstructure of mixes considering the interface transition zone was studied. Results show that after exposure to cycles of freezing and thawing, the quality of concrete regarding ultrasonic pulse velocity did not change. The electrical resistance of specimens decreased significantly in X-direction and slightly in Y-direction after applying freeze-thaw cycles in all mixes. Nevertheless, surface modification of RCAs can increase electrical resistance and improve durability of concrete. SEM images show that the interface transition zone before and after freeze-thaw cycles remained unchanged which means strong bond between aggregate, new mortar, and old mortar. An estimation of the total charge passed indicated that all recycled aggregate concretes can be classified in a safe area and with very low chloride ion penetrability according to ASTM C1202.

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Experimental Examination of Electrical Characteristics for Portland Cement Mortar Frost Damage Evaluation

Cited by 6 publications

References 48 publications

Spatial characteristics of stray current corrosion of reinforcing bars in pseudo concrete

Spatial characteristics of stray current corrosion of reinforcing bars in pseudo concrete

Ilmenite Mud Waste as an Additive for Frost Resistance in Sustainable Concrete

Deicer Salt-Scaling Resistance of Concrete Using Recycled Concrete Aggregates Pretreated by Silica Fume Slurry

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