Application of sulphoaluminate cement to repair deteriorated concrete members in chloride ion rich environment-A basic experimental investigation of durability properties

Cai, Gaochuang; Zhao, Jun

doi:10.1007/s12205-016-0130-4

Cited by 32 publications

(16 citation statements)

References 41 publications

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“…The protection provided by Al(OH) 4 − is attributed to its ability to release hydroxyl. In the corrosion process, localized acidification occurs in the active point because of the hydrolysis of metal ion [38][39][40], as explained by Equation (6). If there is no immediate additional supplement of OH − from the adjoining solution, this active point will not be repaired (repassivation) and corrosion occurs.…”

Section: Effect Of Aluminate Ionmentioning

confidence: 99%

“…So, in Janotka's work, not only the relatively low alkalinity, but also the sulfate ion present in pore solution were important factors which contributed to depassivation. Cai [6] noticed that tiny corrosion on steel bars may occur, but the development of corrosion can be controlled, because concrete will become more compactness due to the hydration of CSA. Based on the development of the pore solution chemistry studied in Section 3.1, the tiny corrosion at initial stage was probably caused by sulfate ion in the pore solution of low alkalinity.…”

Section: Corrosion Behavior Of Steel In Csa Based Materialsmentioning

confidence: 99%

“…The application of new cement, however, changes the internal environment of concrete, which may influence the properties of the passive film [1,2]. Currently, only a few experiments on steel passivation have been conducted in relation to CSA; therefore, the condition of steel embedded in CSA-based materials is not yet fully understood [3][4][5][6]. As an important part of the concrete internal environment, pore solution plays a significant role in preventing or accelerating steel corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Pore Solution Chemistry of Calcium Sulfoaluminate Cement and Its Effects on Steel Passivation

et al. 2019

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Calcium sulfoaluminate cement (CSA) is a type of low-CO2 binder which has been widely applied in the production of concrete. To investigate the protection capability offered by CSA to keep steel from corrosion, the pore solution chemistry of CSA on steel passivation was investigated in this study. The pore solution of CSA pastes, extracted by an ex situ leaching method, was studied and compared with ordinary Portland cement (OPC). The results show that the alkalinity of the CSA pore solution is not only much lower than that of OPC, but also that a new type of ion, Al(OH)4−, and high concentration of SO42− were detected in the liquid phase of CSA. Based on pore solution chemistry analysis, a simulated pore solution (SPS) system was designed to assess the comprehensive impact of alkalinity and ion composition, featured as properties of CSA, on steel passivation. The results of the corrosion potential evolution highlight the importance of alkalinity in passivation. SO42− can cause depassivation when there is not enough hydroxyl, but Al(OH)4− is able to maintain the alkalinity of the system, enhancing the stability of the passive film.

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Section: Effect Of Aluminate Ionmentioning

confidence: 99%

Section: Corrosion Behavior Of Steel In Csa Based Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pore Solution Chemistry of Calcium Sulfoaluminate Cement and Its Effects on Steel Passivation

et al. 2019

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“…Cai and Zhao [8] compared the protective layer thickness stipulated in the general atmospheric environment of the Chinese and European code for durability of concrete, and concluded that the value stipulated in the European code was 10mm larger than that in China, thus prolonging the carbonization life of the structure for at least 40 years.…”

Section: Literature Reviewmentioning

confidence: 99%

Durability of Reinforced Concrete Members Considering the Dynamic Interaction of Stress-Corrosion Expansion and Cracking

2019

IJOMAM

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In order to study the whole process of corrosion expansion and cracking of protective coatings of reinforced concrete columns under the coupling condition of load and chloride corrosion environment, the transmission characteristics of chloride salts in loaded concrete columns and the deterioration mechanism of cracking and spalling of protective coatings caused by steel corrosion are studied. The transport characteristics of chloride salts in concrete under the coupling condition of load and erosion environment are studied by means of creep tester. The loadbearing levels of specimens are divided into four groups according to the design values of ultimate load: 0%, 20%, 40% and 60%. The transport of chloride ions in concrete in marine environment is simulated by dry-wet cycling method. The results show that the existence of compressive stress accelerates the chloride ion transport in concrete at the initial stage of loading, and the higher the stress level, the faster the chloride ion transport. With the increase of loading time, the stress hinders the transport process of chloride ion. In the same period, the transmission efficiency in concrete without stress is the highest. In the same period, the chloride ion concentration on the surface gradually decreases with the compressive stress level. The longer the time, the more obvious the downward trend. The peak chloride ion content has little change with the increase of the compressive stress level; at the same compressive stress level, the chloride ion diffusion coefficient is basically unchanged with the increase of the dry-wet cycle; in the same cycle, the chloride ion diffusion coefficient increases with the increase of the stress level, but does not show a linear relationship. Using large-scale finite element DIANA (High-end Nonlinear Finite Element Analysis Software), the whole process of rust expansion and cracking of protective layer of loaded concrete column is numerically analyzed.

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“…Sulphoaluminate cement (SAC) is well known for its high early strength, fast setting, and high frost and permeation resistance. The SAC has been widely used in the rapid construction and repair of existing structures [1,2], structures exposed to sub-zero temperature [3], as well as water retaining structures [4,5] in the last few decades. Compared to the ordinary Portland cement (OPC), SAC is green cement with lower CO 2 emissions [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Mechanical behaviour of micro-fine steel fibre reinforced sulphoaluminate cement composite

Feng

Chen

Hadi

et al. 2018

Construction and Building Materials

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In this study, a new cement-based composite with high early strength and toughness was developed by the addition of micro-fine steel fibre (MSF) in sulphoaluminate cement (SAC). The new composite is termed as MSF reinforced SAC composite (MSFRSC). The mechanical behaviour of MSFRSC was experimentally investigated, the flexural toughness and ductility of MSFRSC was evaluated. It was found that the compressive strength, flexural strength, shear strength, flexural toughness and ductility of MSFRSC were significantly influenced by the curing time and volume fraction of MSF. The compressive strength, flexural strength and shear strength of MSFRSC increased with the increase of curing time, especially during the first three days. The flexural strength and shear strength of MSFRSC improved significantly with the increase of the volume fraction of MSF. The flexural toughness of MSFRSC significantly improved and the ductility slightly improved with the increase of the volume fraction of MSF from 0.0% to 2.0%. The flexural toughness slightly increased and the ductility slightly decreased with the increase of the curing time from 1 day to 28 days. Also, the recommendations of different codes for the evaluation of the flexural toughness and ductility of MSFRSC were compared. The recommendations in ASTM C1609 fully reflected the flexural toughness and ductility of MSFRSC. The recommendations in JG/ T 472-2015 distinguished the influence of MSF on the pre-peak and post-peak flexural load-deflection behaviours of MSFRSC. A simplified approach based on JG/T 472-2015 was proposed to evaluate the flexural ductility of MSFRSC.

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Application of sulphoaluminate cement to repair deteriorated concrete members in chloride ion rich environment-A basic experimental investigation of durability properties

Cited by 32 publications

References 41 publications

Pore Solution Chemistry of Calcium Sulfoaluminate Cement and Its Effects on Steel Passivation

Pore Solution Chemistry of Calcium Sulfoaluminate Cement and Its Effects on Steel Passivation

Durability of Reinforced Concrete Members Considering the Dynamic Interaction of Stress-Corrosion Expansion and Cracking

Mechanical behaviour of micro-fine steel fibre reinforced sulphoaluminate cement composite

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