Effect of particle size distribution and calcium aluminate cement on the rheological behaviour of all-alumina refractory castables

Silva, Abílio P.; Segadães, Ana M.; Pinto, Deesy G.; Oliveira, Luiz António Pereira de; Devezas, Tessaleno C.

doi:10.1016/j.powtec.2012.04.028

Cited by 26 publications

(16 citation statements)

References 13 publications

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“…It was found that both hexagonal and cubic hydration products are susceptible to carbonation and can react with atmospheric CO 2 . The stretching vibrations of CO 3 2-in carbonates were observed at 1416 cm -1 (Fig. 5) Z-H-T20, 50A-50C 7 A 3 Z-H-T20, 75A-25C 7 A 3 Z-H-T20), the modes corresponding to the a-Al 2 O 3 coexisting with calcium aluminate hydrates can be identified.…”

Section: Spectroscopic Analysis (Ft-ir) Of Hardened Binder Pastesmentioning

confidence: 93%

“…With increasing curing temperature at 50°C, intense C 3 AH 6 peaks were found, due to the high crystallinity of this phase after the thermal treatment. It is observed that Al(OH) 3 is not amorphous in nature and characterized by the sharp peaks (Fig. 4).…”

Section: Calorimetric Studiesmentioning

confidence: 95%

“…They clearly show that at high temperature, noticeable sharpening of the bands occurs. The strong sharp bands appearing in the 3670-3400 cm -1 are due to valence OH vibrations of the water molecules in the cubic C 3 AH 6 hydrate and aluminum hydroxide, Al(OH) 3 . The strong peaks at 3661 and additionally at 519 cm -1 correspond to C 3 AH 6 , which was formed when calcium zirconium aluminate was subjected to hydration reaction at elevated temperature (50°C).…”

Section: Spectroscopic Analysis (Ft-ir) Of Hardened Binder Pastesmentioning

confidence: 99%

“…Hydraulic bonding via calcium aluminate cement (CAC) is the most applied mechanism due to both castable fluidity and green mechanical strength [1][2][3][4][5]. Nevertheless, several different alternative bonding systems for monolithic refractories have been developed in recent years mainly due to the necessity of the reduction in CaO content and thereby improve cold and hot strength, reduce porosity, increase density and corrosion resistance of castables [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Study of the hydration of calcium zirconium aluminate (Ca7ZrAl6O18) blended with reactive alumina by calorimetry, thermogravimetry and other methods

Madej

Szczerba

2015

J Therm Anal Calorim

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The reactivities of hydratable alumina, calcium zirconium aluminate and their binary mixtures were investigated by calorimetric method, X-ray diffraction, Fourier transform infrared spectroscopy (FT-IR), differential thermal/thermogravimetric analysis (DTA-TG) and scanning electron microscope observations. The rate of heat evolution illustrates only one distinct exothermic peak in the mixtures containing calcium zirconium aluminate which corresponds the subsequent precipitation of hydrated material mainly in the form of amorphous CaO-Al 2 O 3 -H 2 O phases and crystalline C 4 AH 19 occurs simultaneously after wetting of Ca 7 ZrAl 6 O 18 grains. Nevertheless, coexistence of both unstable calcium aluminate hydrates (CAH 10 , C 2 AH 8 , C 4 AH 19 ) and thermodynamically more stable C 3 AH 6 detected by FT-IR and DTA-TG in the paste cured at 20°C may have originated in the thermally induced partial conversion reaction due to the considerable amount of heat generated by the Ca 7 ZrAl 6 O 18 hydration. It is also found that curing temperature affected the hydration products formed in the hydration products of both Ca 7-ZrAl 6 O 18 and Ca 7 ZrAl 6 O 18 /Al 2 O 3 blends. Reactive alumina influences the hydration behavior of Ca 7 ZrAl 6 O 18 facilitating the nucleation and growth of hydration products, causes characteristic changes in the microstructure of hardened blended pastes and favors recrystallization of dehydrated calcium aluminates.

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Section: Spectroscopic Analysis (Ft-ir) Of Hardened Binder Pastesmentioning

confidence: 93%

Section: Calorimetric Studiesmentioning

confidence: 95%

Section: Spectroscopic Analysis (Ft-ir) Of Hardened Binder Pastesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the hydration of calcium zirconium aluminate (Ca7ZrAl6O18) blended with reactive alumina by calorimetry, thermogravimetry and other methods

Madej

Szczerba

2015

J Therm Anal Calorim

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“…Calcium aluminate cements (CACs) are still the most applied hydraulic binders in high performance industrial applications, such as those requiring: resistance to chemical attack, high early strength, refractoriness, resistance to abrasion, and/or low ambient temperature placement, especially in the case of use as the hydraulically setting cement for bonding refractory castables [1][2][3][4][5][6][7][8][9]. Nevertheless, advances in monolithic refractories require the development of new hydraulic bonding systems besides CACs.…”

Section: Introductionmentioning

confidence: 99%

Calorimetry and other methods in the studies of reactive magnesia–hydratable alumina–microsilica hydrating mixtures

Madej

Ortmann²,

Szczerba

et al. 2016

J Therm Anal Calorim

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The reactivities of the binary and ternary mixtures of reactive magnesia (MgO:M), hydratable alumina (Al 2 O 3 :A) and microsilica (SiO 2 :S) micropowders were investigated by calorimetric method and other analytical techniques (X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), differential thermal/thermogravimetric (DTA-TG) analysis and scanning electron microscope (SEM) observations). Effect of water/solid mass ratio and temperature on the hydration behavior of the M-A, M-A-S, M-S, A-M-S and A-S hydratable binders were established. The methodological considerations on both in situ and ex situ mixing techniques have also been taken. The initial mixing peak was due to wetting of the binder particles and initial dissolution reactions. A second, extensive heat peak was associated with the formation of crystalline and noncrystalline hydration products, i.e., brucite Mg(OH) 2 , magnesium aluminate hydrate (MAH; H:H 2 O)-like phase, magnesium silicate hydrate (MSH)-like phase and magnesium aluminum silicate hydrate gels (MASH). Negligible heat was evolved during the hydration reaction of A-S mixture, and the second reaction peak was not observed. Nevertheless, the presence of Al 2 O 3 and SiO 2 in other combinations contributes to the consumption of Mg(OH) 2 which was formed during the initial stages of hydration and leads to the formation of cementitious products, like M-A-H, M-S-H and M-A-S-H.

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Low-Cement Refractory Concrete Based on Kaolin Chamotte Aggregate with Improved Workability

Abyzov,

Leshchenko

2023

Refract Ind Ceram

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Effect of particle size distribution and calcium aluminate cement on the rheological behaviour of all-alumina refractory castables

Cited by 26 publications

References 13 publications

Study of the hydration of calcium zirconium aluminate (Ca7ZrAl6O18) blended with reactive alumina by calorimetry, thermogravimetry and other methods

Study of the hydration of calcium zirconium aluminate (Ca7ZrAl6O18) blended with reactive alumina by calorimetry, thermogravimetry and other methods

Calorimetry and other methods in the studies of reactive magnesia–hydratable alumina–microsilica hydrating mixtures

Low-Cement Refractory Concrete Based on Kaolin Chamotte Aggregate with Improved Workability

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