influence of the gypsum dehydration temperature
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influence of the gypsum dehydration temperature

Influence of the Gypsum Dehydration Temperature and Alkali ...

While dehydrating gypsum with additives at the temperatures of 800 °C and 900 °C the influence of alkali additives on both the crystalline structure of anhydrite and properties of anhydrite binder was investigated.

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Influence of the gypsum dehydration temperature and alkali ...

DOI: 10.2298/SOS1002233L Corpus ID: 135642604. Influence of the gypsum dehydration temperature and alkali additives on the properties of anhydrite cement @article{Lekeviien2010InfluenceOT, title={Influence of the gypsum dehydration temperature and alkali additives on the properties of anhydrite cement}, author={V. Le{\vs}kevi{\vc}ienė and

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DOISerbia - Influence of the gypsum dehydration ...

Leskeviciene, V.; Sarlauskaite, I.; Nizeviciene, D.; Kybartiene, N. - Influence of the gypsum dehydration temperature and alkali additives on the properties of anhydrite cement -

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Influence of the gypsum dehydration temperature and alkali ...

While dehydrating gypsum with additives at the temperatures of 800°C and 900°C the influence of alkali additives on both the crystalline structure of anhydrite and properties of anhydrite binder was investigated. The industrial and household wastes including other lowcost materials were used as additives. Having heated them with gypsum the anhydrite with alkali

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Dihydrate gypsum dehydration temperature

Dec 20, 1995 The main dehydration of the calcium sulphate dehydrate part of synthetic gypsum occurs between 95 and 170°C (heating rate 5°C min −1) and seems to proceed via a process with an activation energy of 392 ± 100 kJ mol −1 for α-values between 0 and 0.1. GET PRICE Influence of the Calcination Temperature of Synthetic

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Dehydration Temperature of Gypsum - JST

(1) In an atomsphere, the primary dehydration temperature of natual dihydrated gypsum used as a test sample is 133°C while its secondary dehydration temperature being 192°C. Under pressure of saturated water vapor, the same sample is primarily dehydrated at 142°C without the secondary dehydration and is directly lead to the natural anhydrit as the temperature increases

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Thermal behaviour and kinetics of dehydration of gypsum in ...

11.01.2009  Dehydration of gypsum has been investigated in isothermal conditions within the 348–403 K range with a temperature increase of 5 K. Dehydration proceeds through the CaSO 4 2H 2 O → CaSO 4 0.5H 2 O → γ-CaSO 4 steps. Experimental data have been fitted with the Avrami equation to calculate the empirical activation energy of the process.

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Influence of the gypsum dehydration temperature and alkali ...

DOI: 10.2298/SOS1002233L Corpus ID: 135642604. Influence of the gypsum dehydration temperature and alkali additives on the properties of anhydrite cement @article{Lekeviien2010InfluenceOT, title={Influence of the gypsum dehydration temperature and alkali additives on the properties of anhydrite cement}, author={V. Le{\vs}kevi{\vc}ienė and

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DOISerbia - Influence of the gypsum dehydration ...

Leskeviciene, V.; Sarlauskaite, I.; Nizeviciene, D.; Kybartiene, N. - Influence of the gypsum dehydration temperature and alkali additives on the properties of anhydrite cement - Science of Sintering. doi Serbia. Home; For researchers; Open Access; News; About service; National l ibrary of Serbia; About the journal. Editorial policy. Instructions for authors. Cobiss All issues

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Dihydrate gypsum dehydration temperature

Influence of the Calcination Temperature of Synthetic . The obtained dihydrate calcium sulphate may undergo internal changes under the influence of temperature (Figure 1). Figure 1. Possible transformations of the dehydration and hydration of synthetic gypsum in the calcination process [23]. The dehydration process takes place successively over a period of time and depends on

More

Dehydration Temperature of Gypsum - JST

(1) In an atomsphere, the primary dehydration temperature of natual dihydrated gypsum used as a test sample is 133°C while its secondary dehydration temperature being 192°C. Under pressure of saturated water vapor, the same sample is primarily dehydrated at 142°C without the secondary dehydration and is directly lead to the natural anhydrit as the temperature

More

Gypsum Dehydration During Comminution and Its Effect on ...

A mix containing fixed amounts of gypsum and ordinary portland cement clinker was ground in plant and laboratory ball mills to examine the effect of grinding in different mills on the cement properties. Mineralogical examination showed that in the plant mill (1200 cm×260 cm), because of the rising temperature during grinding, gypsum was dehydrated to hemihydrate, while there

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The influence of building gypsum temperature on slurry

Influence of the Gypsum Dehydration Temperature and Alkali Additives on the Properties of Anhydrite Cement V. Leskeviciene, I. Sarlauskaite, D. Nizeviciene*), N. Kybartiene Kaunas University of Technology, Radvilenu 19, LT ─ 50270 Kaunas, Lithuania Abstract: While dehydrating gypsum with additives at the temperatures of 800 °C and 900 °C the

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Effect of Temperature on the Rate of Setting of Gypsum ...

EXPERIMENTS carried out in this laboratory with some commercial gypsum plasters show that, between 0° and 50° C., temperature may exert a comparatively small effect upon the

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Thermal properties and microstructure of gypsum board and ...

4 is formed during gypsum dehydration, which was also confirmed by Kuntze [4] and Paulik et al. [5]. The effect of experimental conditions such as temperature, pressure, and particle size of gypsum was investigated as well. The dehydration reaction is endothermic, that is, an amount of energy is needed to break the crystal water [8–10], which also explains why gypsum has a

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Tectonic Implications of Gypsum Dehydration GSA Bulletin ...

In a triaxial compression test at 5 kb pressure, we observe a tenfold strength decrease (from 2.7 to 0.25 kb) in sealed polycrystalline gypsum cylinders if the temperature is increased from 100° to 150° C. This marked decrease is interpreted as being due to the dehydration of gypsum with consequent rise in fluid (pore) pressure to a value approaching the confining (overburden)

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Scrutinizing Gypsum Board Thermal Performance at ...

09.09.2010  This article investigates the thermal performance of gypsum boards in the dehydration temperature region, where pronounced chemical reactivity is anticipated. Gypsum board samples were gradually heated up to 300°C, using a low heating rate. Temperature measurements at pre-selected board locations indicated three distinct stages of gypsum

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Influence of the gypsum dehydration temperature and alkali ...

Science of Sintering (2010-01-01) . Influence of the gypsum dehydration temperature and alkali additives on the properties of anhydrite cement

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Dihydrate gypsum dehydration temperature

Influence of the Calcination Temperature of Synthetic . The obtained dihydrate calcium sulphate may undergo internal changes under the influence of temperature (Figure 1). Figure 1. Possible transformations of the dehydration and hydration of synthetic gypsum in the calcination process [23]. The dehydration process takes place successively over a period of time and depends on

More

Gypsum Dehydration During Comminution and Its Effect on ...

A mix containing fixed amounts of gypsum and ordinary portland cement clinker was ground in plant and laboratory ball mills to examine the effect of grinding in different mills on the cement properties. Mineralogical examination showed that in the plant mill (1200 cm×260 cm), because of the rising temperature during grinding, gypsum was dehydrated to hemihydrate, while there

More

The influence of building gypsum temperature on slurry

Influence of the Gypsum Dehydration Temperature and Alkali Additives on the Properties of Anhydrite Cement V. Leskeviciene, I. Sarlauskaite, D. Nizeviciene*), N. Kybartiene Kaunas University of Technology, Radvilenu 19, LT ─ 50270 Kaunas, Lithuania Abstract: While dehydrating gypsum with additives at the temperatures of 800 °C and 900 °C the

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THE INFLUENCE OF FGD GYPSUM DEHYDRATION PARAMETERS

In this research, the influence of flue gas desulphurization gypsum (known as smoke gypsum) dehydration conditions (temperature and duration) on the β-hemihydrate calcium sulfate formation, the crystal morphology and properties was investigated. The used raw materials and the obtained gypsum binder properties were studied by chemical analysis and instrumental

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dihydrate gypsum dehydration temperature

Influence of the Gypsum Dehydration Temperature and Alkali Additives on the Properties of Anhydrite Cement V. Leskeviciene, I. Sarlauskaite, D. Nizeviciene*), N. Kybartiene Kaunas University of Technology, Radvilenu 19, LT ─ 50270 Kaunas, Lithuania Abstract: While dehydrating gypsum with additives at the temperatures of 800 °C and 900 °C theget price

More

Effect of Temperature on the Rate of Setting of Gypsum ...

EXPERIMENTS carried out in this laboratory with some commercial gypsum plasters show that, between 0° and 50° C., temperature may exert a comparatively small effect upon the

More

Thermal properties and microstructure of gypsum board and ...

4 is formed during gypsum dehydration, which was also confirmed by Kuntze [4] and Paulik et al. [5]. The effect of experimental conditions such as temperature, pressure, and particle size of gypsum was investigated as well. The dehydration reaction is endothermic, that is, an amount of energy is needed to break the crystal water [8–10], which also explains why gypsum has a

More

Tectonic Implications of Gypsum Dehydration GSA Bulletin ...

In a triaxial compression test at 5 kb pressure, we observe a tenfold strength decrease (from 2.7 to 0.25 kb) in sealed polycrystalline gypsum cylinders if the temperature is increased from 100° to 150° C. This marked decrease is interpreted as being due to the dehydration of gypsum with consequent rise in fluid (pore) pressure to a value approaching the confining (overburden)

More

Scrutinizing Gypsum Board Thermal Performance at ...

09.09.2010  This article investigates the thermal performance of gypsum boards in the dehydration temperature region, where pronounced chemical reactivity is anticipated. Gypsum board samples were gradually heated up to 300°C, using a low heating rate. Temperature measurements at pre-selected board locations indicated three distinct stages of gypsum

More
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