Chloride binding and time-dependent surface chloride content models for fly ash concrete

Muthulingam, S.; Rao, B. N.

doi:10.1007/s11709-015-0322-x

Cited by 14 publications

(3 citation statements)

References 35 publications

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“…e chloride permeability by the forces of capillary absorption, diffusion, and hydrostatic pressure was investigated, respectively, and the corresponding models were also established [14][15][16]. Yu et al [17], as well as Muthulingam and Rao [18] presented the effects of mineral admixtures on the chloride permeability, and they found that appropriate content of mineral admixture reduced the chloride permeability. Zhang et al [19] further studied the impact of freeze-thaw damage on the chloride permeability, and the results highlighted that the freeze-thaw damage enhanced the chloride permeability.…”

Section: Introductionmentioning

confidence: 99%

Effects of High Temperature and Cooling Pattern on the Chloride Permeability of Concrete

Duan

2019

Advances in Civil Engineering

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Concrete structure is frequently subjected to the fire attack, whereas the permeability of concrete with fire-damage has received little consideration. is paper aims to investigate the chloride permeability of plain concrete and recycled aggregate concrete (RAC) with fire-damage, and the effects of various cooling patterns and recuring treatment on the chloride permeability are also studied. e results manifest that the elevated temperatures result in an increase in the fire-damage and chloride permeability of concrete, and that the increase becomes more obvious with the temperature above 400°C. Attributing to the water-cooling which provides a recuring environment, the chloride permeability after water-cooling is lower than that after air-cooling when the temperature is 200°C. Whereas when the temperature is above 400°C, the chloride permeability after water-cooling becomes higher than that after air-cooling, due to an extra damage that the water-cooling produces. e recuring treatment can reduce the chloride permeability of concrete with fire-damage, and the reduction becomes more significant when the concrete suffers a serious fire-damage. Exposing to the same condition of high temperature, the addition of recycled aggregate (RA) further boosts the fire-damage and chloride permeability of concrete. Particularly, the chloride permeability increases with the increasing of RA replacement ratios, linearly, and the increased temperatures further lead to an increase in the slope of the fitting straight line.

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Section: Introductionmentioning

confidence: 99%

Effects of High Temperature and Cooling Pattern on the Chloride Permeability of Concrete

Duan

2019

Advances in Civil Engineering

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“…First, the small size of the fly ash particles enhanced the compactness of the cementing materials, thereby improving the filling and impermeability of the concrete. Second, the volcanic ash effect of the fly ash reduced the less stable Ca(OH) 2 content, optimized the slurry structure, and improved the resistance of concrete to chloride ion attack [39]. e high Al 2 O 3 content of fly ash accelerated the generation of chloride ion-binding Friedel salts and increased the bound chloride ion content.…”

Section: Chloride Ion Concentrationmentioning

confidence: 99%

Durability Performance of Concrete with Fly Ash as Fine Aggregate Eroded by Chloride Salt

Mao

Zhang

et al. 2022

Advances in Materials Science and Engineering

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The aim of this study is to investigate the durability of concrete with fly ash as a fine aggregate (CFA) in chloride salt environments. The natural diffusion method is used to analyze the concrete strength, chloride ion concentration, and diffusion coefficient after chloride salt erosion in a laboratory environment. In addition, scanning electron microscopy, X-ray diffraction, and Mercury intrusion porosimetry are performed to clarify the deterioration mechanism of concrete in chloride salt environments. The results indicate that owing to the chloride ion binding effect, the concrete porosity decreases and the concrete strength increases after chloride salt immersion. The decreased porosity caused by delayed hydration is primarily due to Friedel’s salt and CaCO3 produced during chloride ion erosion. CFA has a lower chloride diffusion coefficient and lower chloride concentration compared with ordinary concrete at all depths. In general, CFA exhibits excellent resistance to chloride salt erosion.

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“…Cl − is one of the most important indicators for the deterioration of RCS [140,[143][144][145][146]. In the presence of a critical amount of Cl − , also known as critical chloride content, reinforcement steel suffers quick localized corrosion, forming pits -pitting corrosion.…”

Section: Ofs For Chloride Ions Detectionmentioning

confidence: 99%

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

et al. 2021

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The use of advanced sensing devices for concrete and reinforced concrete structures (RCS) is considered a rational approach for the assessment of repair options and scheduling of inspection and maintenance strategies. The immediate benefits are cost reduction and a reliable prevention of unpredictable events. The use of optical fiber sensors (OFS) for such purposes has increased considerably in the last few years due to their intrinsic advantages. In most of the OFS, the chemical transducer consists of immobilized chemical reagents placed in the sensing region of the optical sensor by direct deposition or by encapsulation in a polymeric matrix. The choice of the support matrix impacts directly on the performance of the OFS. In the last two decades, the development of OFS functionalized with organic–inorganic hybrid (OIH) sol–gel membranes have been reported. Sol–gel route is considered a simple method that offers several advantages when compared to traditional synthesis processes, allowing to obtain versatile materials with unique chemical and physical properties, and is particularly valuable in the design of OIH materials. This review will provide an update of the current state-of-the-art of the OFS based on OIH sol-gel materials for concrete and RCS since 2016 until mid-2021. The main achievements in the synthesis of OIH membranes for deposition on OFS will be discussed. The challenges and future directions in this field will also be considered, as well as the main limitations of OFS for RCS monitoring.

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Chloride binding and time-dependent surface chloride content models for fly ash concrete

Cited by 14 publications

References 35 publications

Effects of High Temperature and Cooling Pattern on the Chloride Permeability of Concrete

Effects of High Temperature and Cooling Pattern on the Chloride Permeability of Concrete

Durability Performance of Concrete with Fly Ash as Fine Aggregate Eroded by Chloride Salt

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

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