Study on the Carbonation Behavior of Cement Mortar by Electrochemical Impedance Spectroscopy

Dong, Bo‐Qing; Qiu, Qiwen; Xiang, Jiaqi; Huang, Canjie; Xing, Feng; Han, Ningxu

doi:10.3390/ma7010218

Cited by 72 publications

(19 citation statements)

References 40 publications

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“…This explains the increase in compressive strength of mortars/concrete with continued curing when exposed to CO 2 laden environment. Conversely, as shown in (8), continued ingress of CO 2 attacks CSH resulting in its disintegration and subsequent loss of strength in cement based structures [6,21,22,61,62]. This enhanced at low RH.…”

Section: Compressive Strengthmentioning

confidence: 88%

“…Moderate carbonation process occurs on the surface layer of cement based materials leading to the formation of CaCO 3 . The CaCO 3 formed is deposited on the pore network in the hydrated cement matrix resulting in pore refinement of the carbonated layer [6,21,22,61,62]. This is beneficial since pore refinement subsequently results in increased strength, reduced porosity and improved durability of hydrated cement.…”

Section: Compressive Strengthmentioning

confidence: 99%

“…As a result, many cement based structures deteriorate prematurely resulting in short service life [17][18][19]. Repair and maintenance costs are greatly increased in the attempts to mitigate the adverse effects of aggressive substances [6,[18][19][20][21][22][23]. In this paper, an indepth review on current advances on carbonation process, factors affecting carbonation, and effects of carbonation on hardened cement materials have been discussed in detail.…”

Section: Introductionmentioning

confidence: 99%

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Review of Carbonation Resistance in Hydrated Cement Based Materials

Marangu

Thiong’o

Wachira

2019

Journal of Chemistry

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Blended cements are preferred to Ordinary Portland Cement (OPC) in construction industry due to costs and technological and environmental benefits associated with them. Prevalence of significant quantities of carbon dioxide (CO2) in the atmosphere due to increased industrial emission is deleterious to hydrated cement materials due to carbonation. Recent research has shown that blended cements are more susceptible to degradation due to carbonation than OPC. The ingress of CO2 within the porous mortar matrix is a diffusion controlled process. Subsequent chemical reaction between CO2 and cement hydration products (mostly calcium hydroxide [CH] and calcium silicate hydrate [CSH]) results in degradation of cement based materials. CH offers the buffering capacity against carbonation in hydrated cements. Partial substitution of OPC with pozzolanic materials however decreases the amount of CH in hydrated blended cements. Therefore, low amounts of CH in hydrated blended cements make them more susceptible to degradation as a result of carbonation compared to OPC. The magnitude of carbonation affects the service life of cement based structures significantly. It is therefore apparent that sufficient attention is given to carbonation process in order to ensure resilient cementitious structures. In this paper, an indepth review of the recent advances on carbonation process, factors affecting carbonation resistance, and the effects of carbonation on hardened cement materials have been discussed. In conclusion, carbonation process is influenced by internal and external factors, and it has also been found to have both beneficial and deleterious effects on hardened cement matrix.

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Section: Compressive Strengthmentioning

confidence: 88%

Section: Compressive Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Review of Carbonation Resistance in Hydrated Cement Based Materials

Marangu

Thiong’o

Wachira

2019

Journal of Chemistry

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“…In addition to the voltammetry test, electrochemical impedance spectroscopy (EIS) has been widely used to determine the corrosion susceptibility of steel reinforcement in concrete by measuring its electrochemical impedance (Z) [22][23][24][25][26]. This is achieved by applying a small sinusoidal potential, E 0 • sin(ωt), to an electrochemical cell.…”

Section: Introductionmentioning

confidence: 99%

Stray current induced corrosion of steel fibre reinforced concrete

Tang

2017

Cement and Concrete Research

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Stray current induced corrosion is a major technical challenge for modern electric railway systems. The leakage of stray current to surrounding reinforced concrete structures can lead to steel reinforcement corrosion and the subsequent disintegration of concrete. Steel fibre reinforced concrete has been increasingly used as the railway tunnel lining material but it is not clear if discrete steel fibres can still pick up and transfer stray current in the same way as conventional steel reinforcement and lead to similar corrosion reactions. The corrosion behaviour of steel fibres was investigated through voltammetry tests and electrochemical impedance spectroscopy. The presence of high concentration chloride ions was found to increase the pitting corrosion tendency of steel fibres in simulated concrete pore solutions and mortar specimens. The chloride threshold level for corrosion of steel fibres in concrete is approximately 4% NaCl (by mass of cement) which is significantly higher than that of conventional steel reinforcement

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“…and external factors (surrounding environment, stress characteristics, etc.) [6,7,8,9,10,11,12]. For cement mortar made of same materials, the mechanical properties are different when the material mixture ratio is different, and the mechanical properties of the specimens are also different when the loading path is different.…”

Section: Introductionmentioning

confidence: 99%

Uniaxial Compression Behavior of Cement Mortar and Its Damage-Constitutive Model Based on Energy Theory

Tan

Ning

et al. 2019

Materials

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The mechanical properties of mortar materials in construction are influenced both by their own proportions and external loads. The trend of the stress–strain curve in cracks compaction stage has great influence on the relationship between the strength and deformation of cement mortar. Uniaxial compression tests of mortar specimens with different cement–sand ratios and loading rates were carried out, and the stored and dissipated energies were calculated. Results indicated that the elastic modulus and strength of mortar specimens increase with the cement–sand ratio and loading rate. The energy dissipation shows good consistency with the damage evolution. When the loading rate is less than 1.0 mm/min, most of the constitutive energy at the peak point is stored in the specimen and it increase with cement–sand ratio. A simple representation method of axial stress in cracks compaction stage was proposed and an energy-based damage constitutive model—which can describe well the whole process of cement mortar under uniaxial compression—was developed and verified.

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Study on the Carbonation Behavior of Cement Mortar by Electrochemical Impedance Spectroscopy

Cited by 72 publications

References 40 publications

Review of Carbonation Resistance in Hydrated Cement Based Materials

Review of Carbonation Resistance in Hydrated Cement Based Materials

Stray current induced corrosion of steel fibre reinforced concrete

Uniaxial Compression Behavior of Cement Mortar and Its Damage-Constitutive Model Based on Energy Theory

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