Corrosion Resistance of Calcium Aluminate Cement Concrete Exposed to a Chloride Environment

Ann, Ki Yong; Cho, Chang‐Geun

doi:10.3390/ma7020887

Cited by 35 publications

(11 citation statements)

References 11 publications

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“…After reaching an OD 600 the bacteria were collected by centrifugation and used for polyP extraction, following the described procedure [51]. Samples were successively extracted by applying a procedure that avoids hydrolysis of long-chain polyP [52]. Protein was removed from the extracts with phenol/chloroform (1:1 ( v / v )), followed by three successive extractions with chloroform.…”

Section: Methodsmentioning

confidence: 99%

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Transformation of Construction Cement to a Self-Healing Hybrid Binder

Müller

Tolba

Wang

et al. 2019

IJMS

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A new biomimetic strategy to im prove the self-healing properties of Portland cement is presented that is based on the application of the biogenic inorganic polymer polyphosphate (polyP), which is used as a cement admixture. The data show that synthetic linear polyp, with an average chain length of 40, as well as natural long-chain polyP isolated from soil bacteria, has the ability to support self-healing of this construction material. Furthermore, polyP, used as a water-soluble Na-salt, is subject to Na+/Ca2+ exchange by the Ca2+ from the cement, resulting in the formation of a water-rich coacervate when added to the cement surface, especially to the surface of bacteria-containing cement/concrete samples. The addition of polyP in low concentrations (<1% on weight basis for the solids) not only accelerated the hardening of cement/concrete but also the healing of microcracks present in the material. The results suggest that long-chain polyP is a promising additive that increases the self-healing capacity of cement by mimicking a bacteria-mediated natural mechanism.

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Section: Methodsmentioning

confidence: 99%

“…The polyP content was determined spectrophotometrically using a Beckman DU-64 spectrophotometer [51,53]. The resulting polyP yield was 70 µg/g bacteria (wet weight), following the established determination method [52].…”

Section: Methodsmentioning

confidence: 99%

Transformation of Construction Cement to a Self-Healing Hybrid Binder

Müller

Tolba

Wang

et al. 2019

IJMS

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“…The development of cracking in concrete structures is one of the major factors influencing the durability of structures. Cracks accelerate the penetration of water and the diffusion of harmful ions, such as chloride, leading to damage and durability problems [ 10 ]. Therefore, the use of HPFRCC can contribute to enhancing the durability of structures by smearing one or several dominant cracks into many finely distributed cracks, even under severely loaded conditions.…”

Section: Introductionmentioning

confidence: 99%

Chloride Permeability of Damaged High-Performance Fiber-Reinforced Cement Composite by Repeated Compressive Loads

Lee¹,

Hyun

Kim

et al. 2014

Materials

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Abstract:The development of cracking in concrete structures leads to significant permeability and to durability problems as a result. Approaches to controlling crack development and crack width in concrete structures have been widely debated. Recently, it was recognized that a high-performance fiber-reinforced cement composite (HPFRCC) provides a possible solution to this inherent problem of cracking by smearing one or several dominant cracks into many distributed microcracks under tensile loading conditions. However, the chloride permeability of HPFRCC under compressive loading conditions is not yet fully understood. Therefore, the goal of the present study is to explore the chloride diffusion characteristics of HPFRCC damaged by compressive loads. The chloride diffusivity of HPFRCC is measured after being subjected to various repeated loads. The results show that the residual axial strain, lateral strain and specific crack area of HPFRCC specimens increase with an increase in the damage induced by repeated loads. However, the chloride diffusion coefficient increases only up to 1.5-times, whereas the specific crack area increases up to 3-times with an increase in damage. Although HPFRCC shows smeared distributed cracks in tensile loads, a significant reduction in the diffusion coefficient of HPFRCC is not obtained compared to plain concrete when the cyclic compressive load is applied below 85% of the strength. OPEN ACCESSMaterials 2014, 7 5803

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“…This may be ascribed to the chemical equilibrium for chloride ions at the interface between specimen surface and solution. The higher Al 2 O 3 content in cement clinker would enhance the formation of chloroaluminate hydrates, which often would result from a reaction between cement paste and free chlorides to remove/immobilise them from the pore solution [10,19]. The higher chloride binding capacity, resulting from increased C 3 A content, may impose increased concentration of bound chloride on the surface of concrete at a given free chloride concentration due to the chemical balance between concrete surface and saline media [20].…”

Section: Chloride Transportmentioning

confidence: 99%

Chloride Transport of High Alumina Cement Mortar Exposed to a Saline Solution

Yang

Jin

Ann

2016

Advances in Materials Science and Engineering

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Chloride transport in different types of high alumina cement (HAC) mortar was investigated in this study. Three HAC cement types were used, ranging from 52.0 to 81.1% of aluminum oxides in clinker. For the development of the strength, the setting time of fresh mortar was measured immediately after mixing and the mortar compressive strength was cured in a wet chamber at 25 ± 2°C and then measured at 1–91 days. Simultaneously, to assess the rate of chloride transport in terms of diffusivity, the chloride profile was performed by an exposure test in this study, which was supported by further experimentation including an examination of the pore structure, chloride binding, and chemical composition (X-ray diffraction) analysis. As a result, it was found that an increase in the Al2O3 content in the HAC clinker resulted in an increase in the diffusion coefficient and concentration of surface chloride due to increased binding of chloride. However, types of HAC did not affect the pore distribution in the cement matrix, except for macro pores.

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Corrosion Resistance of Calcium Aluminate Cement Concrete Exposed to a Chloride Environment

Cited by 35 publications

References 11 publications

Transformation of Construction Cement to a Self-Healing Hybrid Binder

Transformation of Construction Cement to a Self-Healing Hybrid Binder

Chloride Permeability of Damaged High-Performance Fiber-Reinforced Cement Composite by Repeated Compressive Loads

Chloride Transport of High Alumina Cement Mortar Exposed to a Saline Solution

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