Phase development in conventional and active belite cement pastes by Rietveld analysis and chemical constraints

XRD-Rietveld method has been adopted for quantitative analysis of phases in cement powder, phases in mixed samples of cement and pure calcium hydroxide, and sulfate attack products in cement pastes, based on the TOPAS software. The results show that, Rietveld analysis values show good agreement with the actual levels of mixed samples, and the accuracy degree of Rietveld method is at least as well as that of TG/DSC method which is commonly used in quantitative analysis of calcium hydroxide. By adding appropriate internal standard substance, XRD-Rietveld analysis method can be effectively used in quantitative analysis of sulfate attack products in cement-based materials. This work has practical significance on the study of sulfate attack of cement-based material.

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Rheological properties of belite cement pastes

Advances in Cement Research ◽

10.1680/adcr.1994.6.24.155 ◽

1994 ◽

Vol 6 (24) ◽

pp. 155-159 ◽

Cited By ~ 2

Author(s):

S. Grzeszczyk

Keyword(s):

Rheological Properties ◽

Cement Pastes ◽

Belite Cement

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Effect of Nanosilica Additions on Belite Cement Pastes Held in Sulfate Solutions

Journal of the American Ceramic Society ◽

10.1111/j.1551-2916.2007.02034.x ◽

2007 ◽

Vol 0 (0) ◽

pp. 070916231959005-??? ◽

Cited By ~ 2

Author(s):

Jorge S. Dolado ◽

Igor Campillo ◽

Edurne Erkizia ◽

José A. Ibáñez ◽

Antonio Porro ◽

...

Keyword(s):

Cement Pastes ◽

Sulfate Solutions ◽

Belite Cement

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Effect of polymer latexes with cleaned serum on the phase development of hydrating cement pastes

Cement and Concrete Research ◽

10.1016/j.cemconres.2016.02.013 ◽

2016 ◽

Vol 84 ◽

pp. 30-40 ◽

Cited By ~ 48

Author(s):

Xiangming Kong ◽

Joachim Pakusch ◽

Daniel Jansen ◽

Sebastian Emmerling ◽

Juergen Neubauer ◽

...

Keyword(s):

Cement Pastes ◽

Phase Development

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Physical and Chemo/Mechanical behaviors of fly ash and silica fume belite cement pastes- Part I

NanoNEXT ◽

10.34256/nnxt2121 ◽

2021 ◽

pp. 1-15

Author(s):

Darweesh H.H.M

Keyword(s):

Fly Ash ◽

Silica Fume ◽

Total Porosity ◽

Ultrasonic Pulse Velocity ◽

Ultrasonic Pulse ◽

Pulse Velocity ◽

Heat Of Hydration ◽

Hardened Cement ◽

Cement Pastes ◽

Belite Cement

Physical, chemical and mechanical properties of high belite cement (HBC) blended with high pulverized fly ash (HPFA) with stable ratio of silica fume (SF) in comparison with Portland cement (OPC) were investigated. Results showed that the water of consistency and setting times (Initial and final) tended to increase with the increase of HPFA content. The bulk density and compressive strength were also improved and enhanced with the increase of HPFS content at all hydration times, but only up to 15 % HPFA, and then decreased with further increase. However, the total porosity slightly decreased, but started to increase with further increase of >15 % HPFA. The free lime content of the pure OPC and HBC gradually were increased as the hydration times progressed up to 90 days, while those of blended cements increased only up to 7 days and then decreased onward. The results were confirmed by measuring the heat of hydration and ultrasonic pulse velocity for the optimum cement pastes comparing with those of both OPC and HBC. The heat of hydration of the optimum cement pastes was decreased at all hydration times and become lower than those of OPC and HBC. The ultrasonic pulse velocity test (USPV) proved that the uniformity and quality of the matrix of the hardened cement pastes are good with no cracks.

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Effect of Nanosilica Additions on Belite Cement Pastes Held in Sulfate Solutions

Progress in Nanotechnology ◽

10.1002/9780470588260.ch13 ◽

2014 ◽

pp. 95-100 ◽

Cited By ~ 1

Author(s):

Jorge S. Dolado ◽

Igor Campillo ◽

Edurne Erkizia ◽

José A. Ibáñez ◽

Antonio Porro ◽

...

Keyword(s):

Cement Pastes ◽

Sulfate Solutions ◽

Belite Cement

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Nonstoichiometry, amorphicity and microstructural evolution during phase transformations of photocatalytic titania powders

Journal of Applied Crystallography ◽

10.1107/s0021889809031021 ◽

2009 ◽

Vol 42 (5) ◽

pp. 917-924 ◽

Cited By ~ 7

Author(s):

Suo Hon Lim ◽

Clemens Ritter ◽

Yang Ping ◽

Martin Schreyer ◽

Timothy J. White

Keyword(s):

Microstructural Evolution ◽

Rietveld Analysis ◽

Quantitative Phase Analysis ◽

Internal Standards ◽

X Ray ◽

Scale Factors ◽

Disordered Phase ◽

Multiple Wavelength ◽

Phase Development ◽

Titania Gel

The performance of photocatalytic titania powders is regulated, in part, by nonstoichiometry and the proportions of the crystalline and amorphous components. These variables can be quantitatively established by Rietveld analysis of diffraction data when internal standards are used to fix absolutely the crystallochemical parameters during quantitative phase analysis and to correct for mass absorption. Here, fixed-wavelength neutron and multiple-wavelength X-ray powder diffraction are used to assess phase development in alkoxide-derived titania gel as a function of temperature. In this manner, it is shown that the amorphous gel is progressively replaced by anatase for temperatures ≤ 773 K, and that during the reconstructive transition to rutile (773–873 K) aperiodicity increases as anatase is broken down to clusters of TiO6octahedra, with a fraction (∼10 wt%) of this short-range order persisting to 1273 K. Microabsorption correlates with X-ray energy, leading to systematic aberrations in the Rietveld scale factors connected to microstructural evolution which accompanies phase development during heat treatment. These changes are consistent with encapsulation of anatase and rutile by ubiquitous non-diffracting materials. The appearance of significant quantities of an intervening disordered phase during the dimorph transformation is supportive of recent kinetic models; however, its impact on catalytic activity remains to be determined.

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