Thermal Shock-resistant Cement

Sugama, T.; Pyatina, Tatiana; Gill, Simerjeet K.

doi:10.2172/1091187

Cited by 12 publications

(7 citation statements)

References 34 publications

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“…49 An additional constant voltage (CV) step at 40 mV was included up to a current rate of 0.02 C (E0.04 mA cm À2 ) to ensure complete lithiation of the negative electrode.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

On the interaction of water-soluble binders and nano silicon particles: alternative binder towards increased cycling stability at elevated temperatures

Klamor

Schröder

Brunklaus

et al. 2015

Phys. Chem. Chem. Phys.

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Silicon based composites are among the most promising negative electrodes for lithium ion battery applications due to their high theoretical capacities. One major drawback of silicon based anodes are their large volume changes during lithiation and delithiation. Although many efforts have been made in view of new binder materials and improved electrolytes, the resulting battery cell suffers from severe capacity fading at ambient or elevated temperatures, respectively. The strong reactivity with the electrolyte is considered to be responsible for the reduced cycle life at elevated temperatures. In this work we introduce silicon composite anodes with a novel composition based on a gellan gum binder material that show an improved cycling performance at ambient temperature and at 60 °C. To elucidate the influence of the binder material, we investigated the structure of the silicon based composite anodes in order to understand the nature of the interaction of the gellan gum based binder polymers with the silicon particles in comparison with a common CMC binder. Also the influence of the choice of binder on the interactions at the interface between electrode surface and electrolyte were studied. A combination of powerful techniques including solid state NMR, TEM and EELS, XPS as well as FTIR were applied.

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“…49 An additional constant voltage (CV) step at 40 mV was included up to a current rate of 0.02 C (E0.04 mA cm À2 ) to ensure complete lithiation of the negative electrode.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

On the interaction of water-soluble binders and nano silicon particles: alternative binder towards increased cycling stability at elevated temperatures

Klamor

Schröder

Brunklaus

et al. 2015

Phys. Chem. Chem. Phys.

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“…This paper focuses on the short-time changes in the hydrate phase compositions and morphologies of CAC blends with sodium-metasilicate-activated fly ash class F (FAF) during an attack by sulfuric acid at 90°C. These blends were developed as thermal shock resistant cements (TSRCs) for geothermal wells (Sugama et al, 2012). A Portland cement class G/silica 70/30 wt% blend was tested as a baseline.…”

Section: Introductionmentioning

confidence: 99%

Acid resistance of calcium aluminate cement–fly ash F blends

Pyatina

Sugama

2016

Advances in Cement Research

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The short-term resistance to sulfuric acid at 90°C of four calcium aluminate cement (CAC)-fly ash class F (FAF) blends activated with sodium metasilicate (thermal shock resistant cements (TSRCs)), cured at 300°C, was compared to that of a calcium phosphate cement (CPC) (CAC-FAF blend activated with sodium hexametaphosphate) and a Portland cement class G/silica blend. The mechanical properties and compositions of the acid-exposed samples were evaluated by measuring their compressive strength and by means of x-ray diffraction, μEDX (energy-dispersive x-ray spectrometry), thermogravimetric and Fourier transform infrared analyses. All calcium-containing hydrates were sensitive to the conditions of acid exposure. In the TSRC blends, these hydrates included hydrogrossular, feldspar family minerals and zeolites; in CPC, feldspar minerals and phosphate phases; and in the class G/silica blend, portlandite and tobermorite.Crystalline calcium sulfates formed in the acid-exposed surfaces with the exception of the most aluminium-rich TSRC samples where only potassium(sodium) aluminium sulfate, alunite, was detected. This sample underwent the least changes in weight, compressive strength and had the lowest sulfur permeation into the sample core. Calcium sulfates precipitated on sample surfaces limited sulfur penetration into the core of calcium-rich TSRC, CPC and G/silica blends.

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“…To deal with this issue and develop thermal shock-resistant cements, our previous study investigated the effectiveness of sodium silicate-activated Class F fly ash in improving such resistance of Secar #80 refractory cement [1]. We conducted a multiple air heating (500°C)-water (25°C) cooling quenching cycle test for evaluating thermal shock resistance of 200°C-autoclaved #80/Class F fly ash/sodium silicate blend cements.…”

Section: Introductionmentioning

confidence: 99%

Corrosion-resistant Foamed Cements for Carbon Steels

Sugama¹,

Gill²,

Pyatina³

et al. 2012

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The cementitious material consisting of Secar #80, Class F fly ash, and sodium silicate designed as an alternative thermal-shock resistant cement for the Enhanced Geothermal System (EGS) wells was treated with cocamidopropyl dimethylamine oxide-based compound as foaming agent (FA) to prepare numerous air bubble-dispersed low density cement slurries of 1.3 g/cm 3 . Then, the foamed slurry was modified with acrylic emulsion (AE) as corrosion inhibitor. We detailed the positive effects of the acrylic polymer (AP) in this emulsion on the five different properties of the foamed cement: 1) The hydrothermal stability of the AP in 200C-autoclaved cements; 2) the hydrolysis-hydration reactions of the slurry at 85C; 3) the composition of crystalline phases assembled and the microstructure developed in autoclaved cements; 4) the mechanical behaviors of the autoclaved cements; and, 5) the corrosion mitigation of carbon steel (CS) by the polymer. For the first property, the hydrothermal-catalyzed acid-base interactions between the AP and cement resulted in Ca-or Na-complexed carboxylate derivatives, which led to the improvement of thermal stability of the AP. This interaction also stimulated the cement hydration reactions, enhancing the total heat evolved during cement's curing. Addition of AP did not alter any of the crystalline phase compositions responsible for the strength of the cement. Furthermore, the APmodified cement developed the porous microstructure with numerous defect-free cavities of disconnected voids. These effects together contributed to the improvement of compressivestrength and -toughness of the cured cement. AP modification of the cement also offered an improved protection of CS against brine-caused corrosion. There were three major factors governing the corrosion protection: 1) Reducing the extents of infiltration and transportation of corrosive electrolytes through the cement layer deposited on the underlying CS surfaces; 2) inhibiting the cathodic reactions at the corrosion site of CS; 3) extending the coverage of cement over CS surfaces; and, 4) improving the adherence of the cement to CS surfaces. Thus, the CS's corrosion rate of 176 milli inch/per year (mpy) for 1 wt% FA-foamed cement without AP was considerably reduced to 69 mpy by adding only 2 wt% AP. Addition of AP at 10 wt% further reduced this rate to < 10 mpy.4

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Thermal Shock-resistant Cement

Cited by 12 publications

References 34 publications

On the interaction of water-soluble binders and nano silicon particles: alternative binder towards increased cycling stability at elevated temperatures

On the interaction of water-soluble binders and nano silicon particles: alternative binder towards increased cycling stability at elevated temperatures

Acid resistance of calcium aluminate cement–fly ash F blends

Corrosion-resistant Foamed Cements for Carbon Steels

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