Investigation of calcite precipitation in the drainage system of railway tunnels

Chen, Yifan; Cui, Yu‐Jun; Barrett, Antoine Guimond; Chille, Francesco; Lassalle, S

doi:10.1016/j.tust.2018.10.021

Cited by 40 publications

(19 citation statements)

References 15 publications

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“…high pressure water jetting, and/or adding chemicals such as acids, water softeners, hardness stabilizers, dispersing agents, etc. [43,45,46]. However, the most straightforward concept is to directly reduce the sintering potential of the shotcrete by applying state of the art shotcrete technology, as presented in this study.…”

Section: Ca 2? Leaching and Carbonate Sinteringmentioning

confidence: 99%

Durability of clinker reduced shotcrete: Ca2+ leaching, sintering, carbonation and chloride penetration

et al. 2021

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The reduction of clinker use is mandatory to lower the negative environmental impact of concrete. In shotcrete mixes, similarly to the case of conventional concrete, the use of supplementary cementitious materials (SCMs) and proper mix design allow for the substitution of clinker without compromising the mechanical properties. However, the impact of the substitution on the durability of shotcrete needs to be further assessed and understood. The results from the present study, obtained from real-scale sprayed concrete applications, show a reduction of the Ca2+ leaching and sintering potential of clinker-reduced shotcrete mixes due to the presence of SCMs. This positive effect, crucial for low maintenance costs of tunnels, is mainly related to a reduced portlandite content, which on the other hand negatively affects the carbonation resistance of shotcrete. Additionally, the hydration of SCMs positively influences the chloride penetration resistance presumably due to a combination of microstructural changes and changes in the chloride binding capacity. Differences found in the pore size distribution of the various mixes have low impact on the determined durability parameters, in particular compared to the effect of inhomogeneities produced during shotcrete application.

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Section: Ca 2? Leaching and Carbonate Sinteringmentioning

confidence: 99%

Durability of clinker reduced shotcrete: Ca2+ leaching, sintering, carbonation and chloride penetration

et al. 2021

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“…Materials like construction pipes, water tanks, carpets are come under this section and this type of material has been manufactured according to the 10 to 12 years' time span of life so it is mainly eco-design recycled polymers which can be used for long terms. Now a days Poly Vinyl chloride is the most famous polymer in the construction market for the decoration purposes, under-ceiling purposes and many more [33].…”

Section: Materials Used For Constructionsmentioning

confidence: 99%

Processing and Recycling of thermoplastic polymers: Current Scenario and Future Challenges

Singh¹

2021

TURCOMAT

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Thermoplastic polymers are extensively utilized in electronics, aerospace, automobile and additive manufacturing industries due to low cost, low temperature processing and reusability. Thermoplastics of different grades and chemical structures arereadily available in the market They can be reusedand reshaped, and also can be manufactured with less weight proportion as compared to the metals and ceramics by providing same strength of material. As a result, the plastics products in the market are getting popular day by day with high demand of customized products due to inception of additive manufacturing technologies. In any case, the issue of recycling these materials is challenge due to enormous energy requirements and varying chemical composition of different polymers. There are both mechanical and financial issues that restrict the advancements in this field. The recycling process of polymers can be done by the four different ways such as primary recycling process, secondary recycling process, tertiary recycling process and quaternary recycling process which can be discussed in this systematic review with practical examples. The modifications and implementation of these polymer waste recycling techniques could help to reduce wastage and save material cost which would directly affect the economy of contemporary industries.

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“…A more recent field of operation is the drainage of underground constructions, such as railway and road tunnels . In these flow-through draining systems, CaCO 3 formation is usually initiated by changing the naturally occurring physicochemical conditions, of, that is, groundwater, brines, and/or interstitial solutions. − The maintenance and cleaning of drainage pipes counts for up to 20% of the total maintenance budget over the building’s lifetime of ∼100 years. The usage of GI can reduce the amount, adhesiveness, and material consistency of CaCO 3 scaling and thus limit closure times for maintenance and drainage damage by hydraulic and (hydro-)mechanical cleaning treatment .…”

Section: Introductionmentioning

confidence: 99%

Green Inhibitor Performance against CaCO₃ Scaling: Rate-Modeling Aided Test Procedure

Wedenig

Boch

Leis³

et al. 2021

Crystal Growth & Design

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Green inhibitors (GI) are eco-friendly organic molecules capable of inhibiting the nucleation and precipitation of solids, like CaCO 3 minerals. Although increasingly used in technical settings, their individual selection and dosage guidelines are hardly available and mostly based on empirical observations. In this study the performance of GI, based on aspartate, maleic, and acrylic acid, in concentrations between 0.5 and 10 mg L −1 , was assessed using a newly designed experimental test procedure. The inhibition of CaCO 3 scaling introduced by CO 2 degassing was quantified by thermodynamic modeling. The coupled CO 2 degassing and CaCO 3 precipitation rate models and time-resolved experimental data sets show (i) GI performance to be independent of CO 2 degassing rates, (ii) an upper supersaturation limit for calcite approaching amorphous CaCO 3 solubility, (iii) average efficiencies reaching ∼70−100% and normalized retardation time (delay of precipitation relative to the control test) of ∼3−6 times at a GI concentration of 10 mg L −1 , and (iv) polyaspartate being able to modulate calcite to serve as a template for vaterite growth depending on polymer chain-length, D/L ratio, and ion diffusion rate of the GI. Our rate-model-aided test procedure provides a compact and fast tool to assess and quantify GI performances against CaCO 3 scaling to be properly selected and individually tuned.

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Investigation of calcite precipitation in the drainage system of railway tunnels

Cited by 40 publications

References 15 publications

Durability of clinker reduced shotcrete: Ca2+ leaching, sintering, carbonation and chloride penetration

Durability of clinker reduced shotcrete: Ca2+ leaching, sintering, carbonation and chloride penetration

Processing and Recycling of thermoplastic polymers: Current Scenario and Future Challenges

Green Inhibitor Performance against CaCO₃ Scaling: Rate-Modeling Aided Test Procedure

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Investigation of calcite precipitation in the drainage system of railway tunnels

Cited by 40 publications

References 15 publications

Durability of clinker reduced shotcrete: Ca2+ leaching, sintering, carbonation and chloride penetration

Durability of clinker reduced shotcrete: Ca2+ leaching, sintering, carbonation and chloride penetration

Processing and Recycling of thermoplastic polymers: Current Scenario and Future Challenges

Green Inhibitor Performance against CaCO3 Scaling: Rate-Modeling Aided Test Procedure

Contact Info

Product

Resources

About

Green Inhibitor Performance against CaCO₃ Scaling: Rate-Modeling Aided Test Procedure