Characterization of Cement Paste in Fresh State Using Electrical Resistivity Technique

Sallehi, Hossein

doi:10.22215/etd/2015-11091

Cited by 3 publications

(2 citation statements)

References 40 publications

(149 reference statements)

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“…Although in systems like cement paste pore solution, electrical conductivity is not linearly related to ionic concentration [46], a decrease in ionic conductivity indicates a decrease in the concentration of charge-carrying species in the solution upon carbonation, primarily sodium, potassium, and hydroxide ions. The lower concentration of potassium ions and pH in accelerated carbonation conditions explains the lower electrical conductivity compared to naturally carbonated samples [47]. Sorptivity and porosity measurements were performed on specimens derived from cores extracted from the structure, and the outcomes are depicted in Fig.…”

Section: Pore Solutionmentioning

confidence: 99%

Phase composition and Durability Assessment of 50-year-old Reinforced Concrete subjected to Natural and Accelerated Carbonation

Dudi,

Bishnoi

2024

Preprint

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This paper presents an investigation conducted on a 50-year-old structure in a composite climactic zone of India. The study comprises of two parts, one covering the comparison of long-term natural carbonation and short-term accelerated carbonation, while another reveals insight into the structure’s durability and potential concerns. Mineralogy, pore solution, and transport properties comparison of natural and accelerated carbonated concrete samples highlight similar modifications, demonstrating the representative nature of accelerated carbonation at 3% carbon dioxide concentration. Accelerated carbonation did, however, lead to preferred precipitation of calcite and higher degree of C-S-H carbonation. Additional investigations including core strength, carbonation depth measurements, half-cell potential analysis, resistivity, and corrosion rate measurements were also carried out. Findings from structural investigation indicate that carbonation coefficient shows a high variation within the structure and moisture is found to be main factor influencing the corrosion rate. Based on the results, recommendations on additional measurements are made, to better understand variations in carbonation rate. Visual inspections are seen to become crucial in the propagation phase, especially when half-cell potential and surface resistivity lie in the inconclusive range.

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Section: Pore Solutionmentioning

confidence: 99%

Phase composition and Durability Assessment of 50-year-old Reinforced Concrete subjected to Natural and Accelerated Carbonation

Dudi,

Bishnoi

2024

Preprint

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“…It is known that the electrical resistance of cement depends on the degree of its solidification. The electrical resistivity of cement grows as it solidifies [33]. The rate of resistivity increase depends on water fraction in the cement paste or foam, water conductivity, and other parameters.…”

Section: Sensing Solidification Of Concretementioning

confidence: 99%

Beyond Carbon Steel: Detecting Wellbore Shape and Cavities, and Cement Imperfections in Cased Wells

Eltsov

Patzek

2019

Energies

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The non-corrosive, electrically resistive fiberglass casing materials may improve the economics of oil and gas field projects. At moderate temperatures (<120 °C), fiberglass casing is superior to carbon steel casing in applications that involve wet CO2 injection and/or production, such as carbon capture and storage, and CO2-based enhanced oil recovery (EOR) methods. Without a perfect protective cement shell, carbon steel casing in contact with a concentrated formation brine corrodes and the fiberglass casing is superior again. Fiberglass casing enables electromagnetic logging for exploration and reservoir monitoring, but it requires the development of new logging methods. Here we present a technique for the detection of integrity of magnetic cement behind resistive fiberglass casing. We demonstrate that an optimized induction logging tool can detect small changes in the magnetic permeability of cement through a non-conductive casing in a vertical (or horizontal) well. We determine both the integrity and solidification state of the cement-filled annulus behind the casing. Changes in magnetic permeability influence mostly the real part of the vertical component of the magnetic field. The signal amplitude is more sensitive to a change in the magnetic properties of the cement, rather than the signal phase. Our simulations showed that optimum separation between the transmitter and receiver coils ranged from 0.25 to 0.6 m, and the most suitable magnetic field frequencies varied from 0.1 to 10 kHz. A high-frequency induction probe operating at 200 MHz can measure the degree of solidification of cement. The proposed method can detect borehole cracks filled with cement, incomplete lift of cement, casing eccentricity, and other borehole inhomogeneities.

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Beyond Steel Casing: Detecting Zonal Isolation in the Borehole Environment

Eltsov

Patzek

2019

SPE Middle East Oil and Gas Show and Conference

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Electrically resistive composite casing materials are being introduced to the oil & gas industry. Resistive casing enables electromagnetic logging for exploration and reservoir monitoring, but it requires development of new logging methods. Here we present a technique for the detection of integrity of magnetic cement behind resistive casing. We demonstrate that an optimized induction logging tool can detect small changes in the magnetic permeability of cement through a non-conductive casing in a vertical (or horizontal) well. We can determine both integrity and solidification state of the cement filling annulus behind casing. Changes in magnetic permeability influence mostly the real part of the vertical component of magnetic field. The signal amplitude is more sensitive to a change of magnetic properties of the cement, rather than the signal phase. Our simulations show that optimum separation between the transmitter and receiver coils ranges from 0.25 to 0.6 meters, and the most suitable magnetic field frequencies vary from 0.1 to 10 kHz. A high-frequency induction probe operating at 200 MHz can measure the degree of solidification of cement. The proposed method can detect borehole cracks filled with cement, incomplete lift of cement, casing eccentricity and other borehole in homogeneities.

show abstract

Characterization of Cement Paste in Fresh State Using Electrical Resistivity Technique

Cited by 3 publications

References 40 publications

Phase composition and Durability Assessment of 50-year-old Reinforced Concrete subjected to Natural and Accelerated Carbonation

Phase composition and Durability Assessment of 50-year-old Reinforced Concrete subjected to Natural and Accelerated Carbonation

Beyond Carbon Steel: Detecting Wellbore Shape and Cavities, and Cement Imperfections in Cased Wells

Beyond Steel Casing: Detecting Zonal Isolation in the Borehole Environment

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