Corrosion investigation of fly ash based geopolymer mortar in natural sewer environment and sulphuric acid solution

Khan, Hammad Anis; Castel, Arnaud; Khan, M.S.H.

doi:10.1016/j.corsci.2020.108586

Cited by 79 publications

(36 citation statements)

References 75 publications

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“…It can be seen from Table 1 that the main component of fly ash is SiO 2 , Al 2 O 3 , Fe 2 O 3 , and CaO. To the best of our knowledge, however, these components react with sulfuric acid, and the reaction formula is shown as Equations (6) and (7) [ 46 ]. Therefore, when sulfuric acid solution is used for corrosion, the prepared supports react with sulfuric acid to generate sulfuric acid mineral salt.…”

Section: Resultsmentioning

confidence: 99%

Study on the Preparation and Properties of Talcum-Fly Ash Based Ceramic Membrane Supports

Cheng

et al. 2020

Membranes

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Ceramic membrane method for moisture recovery from flue gas of thermal power plants is of considerable interest due to its excellent selection performance and corrosion resistance. However, manufacturing costs of commercial ceramic membranes are still relatively expensive, which promotes the development of new methods for preparing low-cost ceramic membranes. In this study, a method for the preparation of porous ceramic membrane supports is proposed. Low-cost fly ash from power plants is the main material of the membrane supports, and talcum is the additive. The fabrication process of the ceramic membrane supports is described in detail. The properties of the supports were fully characterized, including surface morphology, phase composition, pore diameter distribution, and porosity. The mechanical strength of the supports was measured. The obtained ceramic membrane supports displays a pore size of about 5 μm and porosity of 37.8%. Furthermore, the water recovery performance of the supports under different operating conditions was experimentally studied. The experimental results show that the recovered water flux varies with operating conditions. In the study, the maximum recovered water flux reaches 5.22 kg/(m2·h). The findings provide a guidance for the ceramic membrane supports application of water recovery from flue gas.

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Section: Resultsmentioning

confidence: 99%

Study on the Preparation and Properties of Talcum-Fly Ash Based Ceramic Membrane Supports

Cheng

et al. 2020

Membranes

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“…To the best of our knowledge, however, these components react with sulfuric acid, and the reaction formula is shown as Eqs. (5) and (6) [43].…”

Section: Characterization Of Fly Ash Based Ceramic Membrane Supportsmentioning

confidence: 99%

Study on the preparation and properties of talcum-fly ash based ceramic membrane supports

Cheng

Zhang

et al. 2020

Preprint

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Ceramic membrane method for moisture recovery from flue gas of thermal power plants is of considerable interest due to its excellent selection performance and corrosion resistance. However, manufacturing costs of commercial ceramic membranes are still relatively expensive, which promotes the development of new methods of preparing low-cost ceramic membranes. In this study, a method for the preparation of porous ceramic membrane supports is proposed. Low-cost fly ash from power plants is the main material of the membrane supports, and talcum is the additive. The fabrication process of the ceramic membrane supports is described in detail. The properties of the supports were fully characterized, including surface morphology, phase composition, pore diameter distribution and porosity. Corrosion resistance and mechanical strength of the supports were measured. The obtained ceramic membrane support displays a pore size of about 5 µm and porosity of 37.8%. Furthermore, the water recovery performance of the supports under different operating conditions was experimentally studied. The experimental results show that, the recovered water flux varies with operating conditions. In the study, the maximum recovered water flux reaches 5.22 kg/(m2·h). The findings provide a guidance for the ceramic membrane supports application of water recovery from flue gas.

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“…The prevention methods developed so far may include the application of linings and coatings [14][15][16], located onto the inner side of sewer pipes, as well as the use of new/improved pipe materials with intrinsic anti-corrosion properties [17,18], or the appropriate chemical dosing of specific agents directly in the wastewater stream [19,20]. According to the relevant literature linings and coatings present some advantages in respect to other mitigation technologies.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Protection Ability of a Magnesium Hydroxide Coating against the Bio-Corrosion of Concrete Sewer Pipes, by Using Short and Long Duration Accelerated Acid Spraying Tests

et al. 2021

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The Microbiologically Induced Corrosion (MIC) of concrete sewer pipes is a commonly known problem that can lead to the destruction of the system, creating multiple public health issues and the need for costly repair investments. The present study focuses on the development of a magnesium hydroxide coating, with optimized properties to protect concrete against MIC. The anti-corrosion properties of the respective coating were evaluated by using short and long duration accelerated sulfuric acid spraying tests. The coating presented satisfying adhesion ability, based on pull-off and Scanning Electron Microscopy (SEM) analysis measurements. The surface pH of the coated concrete was maintained at the alkaline region (i.e., >8.0) throughout the duration of all acid spraying tests. The consumption of the coating, due to the reaction (neutralization) with sulfuric acid, was confirmed by the respective mass and thickness measurements. The protection ability of this coating was also evaluated by recording the formation of gypsum (i.e., the main corrosion product of concrete) during the performed tests, by X-ray Diffraction (XRD) analysis and by the Attenuated Total Reflectance (ATR) measurements. Finally, a long duration acid spraying test was additionally used to evaluate the behavior of the coating, simulating better the conditions existing in a real sewer pipe, and the obtained results showed that this coating is capable of offering prolonged protection to the concrete substrate.

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Corrosion investigation of fly ash based geopolymer mortar in natural sewer environment and sulphuric acid solution

Cited by 79 publications

References 75 publications

Study on the Preparation and Properties of Talcum-Fly Ash Based Ceramic Membrane Supports

Study on the Preparation and Properties of Talcum-Fly Ash Based Ceramic Membrane Supports

Study on the preparation and properties of talcum-fly ash based ceramic membrane supports

Evaluation of the Protection Ability of a Magnesium Hydroxide Coating against the Bio-Corrosion of Concrete Sewer Pipes, by Using Short and Long Duration Accelerated Acid Spraying Tests

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