Reactive belite stabilization mechanisms by boron-bearing dopants

Cuesta, Ana; Losilla, Enrique R.; Aranda, Miguel A. G.; Sanz, J.; Torre, Ángeles G. De la

doi:10.1016/j.cemconres.2012.01.006

Cited by 84 publications

(60 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 3 reports the crystal structures used in this study to simulate the crystalline phase powder patterns [Refs. [42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59]. The powder diffraction file (PDF) codes for all identified phases in the studied cements are also given in Table 3.…”

Section: Xrpd Data Analysismentioning

confidence: 99%

Rietveld quantitative phase analysis of Yeelimite-containing cements

Álvarez-Pinazo

Cuesta

García-Maté

et al. 2012

Cement and Concrete Research

203

View full text Add to dashboard Cite

Section: Xrpd Data Analysismentioning

confidence: 99%

Rietveld quantitative phase analysis of Yeelimite-containing cements

Álvarez-Pinazo

Cuesta

García-Maté

et al. 2012

Cement and Concrete Research

203

View full text Add to dashboard Cite

“…In this work the concentrations of the phosphate in the three clinkers is below 1% and lay in the range of 0.11-0.17%. Furthermore the atomic absorption analysis proved the absence of boron, omitting thus its possible role in the formation of the α′ polymorph reported in the literature (26,38). The presence of alkali oxides with an almost equal amounts in the three clinkers; (Na 2 O = 0.21-0.28%, K 2 O = 0.22-0.28%) reflects its insignificant role in this phenomena.…”

Section: Discussionmentioning

confidence: 85%

“…The differentiation between the various belite polymorphs is difficult but recent work was indicative with the use of synchrotron analysis (36)(37)(38).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

High belite cement from alternative raw materials

Ghorab¹,

Rizk²,

Ibrahim³

et al. 2014

Mater. construcc.

View full text Add to dashboard Cite

Three high belite laboratory clinkers were prepared from traditional and alternative raw materials. Reference clinker was obtained from 77% limestone, 11% sandy clays, 11% fatty clays and 1% iron scales. The fatty clays were replaced by red brick powder in the raw meal of the second clinker and were lowered to 2% with the replacement of 10% of the limestone by egg shells in the third clinker. The SEM examination revealed clear presence of crossed striae and twinning in the rounded belite grains of the reference clinker caused by the transformation of the α′-belite to the β polymorph. Striae were weaker in the second and third clinkers indicating a probable stabilization of the α '-belite polymorph.Compressive strength of the respective cements were attained first after 28 days and the early strength did not improve with increasing fineness. Higher compressive strength values were found for the cement prepared from second clinker. RESUMEN: Cementos con altos contenidos en belita obtenido a partir de materias primas alternativas.Se han preparado tres clinkeres de laboratorio con altos contenidos en belita a partir de materias primas tradicionales y alternativas. El clinker de referencia se obtuvo a partir de una mezcla de caliza, arcillas arenosas y grasas y limaduras de hierro. Las arcillas grasas fueron sustituidas por polvo de ladrillo rojo en la preparación del segundo clinker, y en el tercero el contenido de arcilla grasa fue de solo un 2% y parte de la caliza fue sustituida por cascara de huevo.El estudio realizado por SEM muestra superficies estriadas alrededor de los granos de belita que indican una transformación del polimorfo α´a la forma β-C 2 S, durante el enfriamiento. Esas estrías son menos marcadas en el segundo y tercer clinker, indicando, una estabilización del polimorfo α´-C 2 S.Los valores de resistencias a compresión de los correspondientes cementos, a 28 días de curado, no se ven incrementados por la finura de dichos cementos. Las mayores resistencias se obtuvieron en el cemento preparado a partir del clínker con polvo de ladrillo rojo.

show abstract

“…Both polymorphs, α' H and β of dicalcium silicate were synthesized [25,26] and mixed jointly with both ye'elimites and gypsum. Moreover, mixtures of aliteye'elimites and anhydrite were also prepared.…”

Section: Hydration Of Ye'elimite With Belite and Alitementioning

confidence: 99%

X-ray diffraction, cements and environment, three worlds in one.

et al. 2018

Self Cite

View full text Add to dashboard Cite

Abstract. This keynote lecture will be focused on the strategies for reducing CO 2 emissions in the cement production. Concretely, the production of ecocements with optimised formulations that yield reductions in CO 2 emissions of up to 25%, when compared to OPC production. Phase assemblage has to be carefully optimised to be competitive and these new ecocements should develop compressive strengths of at least 50 MPa at 28 days of hydration. Optimised compositions of several ecocements will be discussed, but all of them are ye'elimite or calcium sulphoaluminate containing ones: belite-ye'elimite-ferrite (BYF), belite-alite-ye'elimite (BAY) and ye'elimite rich ones (CSA). The clinkering temperature of BYF and BAY has to be established to obtain the targeted phase assemblages. Moreover, the stabilisation of alpha-forms of belite is needed to develop high mechanical strengths at early ages. The benefits of the use of waste materials (such as fly ash or slag) as additions to ecocements are three-fold: lower CO 2 emissions due to clinker replacement; valorisation of "useless" products that need a lot of landscape and the consequent efficient consumption of raw materials; and to enhance mechanical properties of the corresponding mortars. The design of appropriate CSA, BYF and BAY mortars, with the final aim of knowing and controlling the hydration mechanisms, will be presented. Particularly, the role of i) type and amount of set regulator (gypsum, anhydrite, etc.), ii) water/cement ratio (w/c); iii) superplasticiser; and iv) pozzolanic additions will be discussed. The role of these parameters in the microstructure and hydraulic behaviour has been investigated through traditional techniques as well as advanced synchrotron characterisation. The formers include laboratory/synchrotron X-ray powder diffraction combined with Rietveld methodology (to obtain phase assemblage), electron microscopy techniques for paste microstructure determination, rheological studies (to control the effect of the different additives, w/c ratio and setting time retarders) and mechanical tests (setting times, compressive strengths and dimensional stability).

show abstract

Reactive belite stabilization mechanisms by boron-bearing dopants

Cited by 84 publications

References 49 publications

Rietveld quantitative phase analysis of Yeelimite-containing cements

Rietveld quantitative phase analysis of Yeelimite-containing cements

High belite cement from alternative raw materials

X-ray diffraction, cements and environment, three worlds in one.

Contact Info

Product

Resources

About