Mineralogical phase analysis of alkali and sulfate bearing belite rich laboratory clinkers

Morsli, Khadija; Torre, Ángeles G. De la; Zahir, Md. Hasan; Aranda, Miguel A. G.

doi:10.1016/j.cemconres.2007.01.012

Cited by 95 publications

(44 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Increasing reactivity of C 2 S is a relevant issue in large-scale production of C 2 S-rich cements [14,15], which is a low-energy and low-emission option to ordinary portland cement, that is mainly composed by C 3 S, the most reactive calcium silicate in clinker. The polimorph β C 2 S predominates in ordinary portland cement and has a rather slow hydration kinetic, leading to lower mechanical strength at early ages [7]. This paper presents experimental results on the effects of sulfur in polymorphic transformation and hydraulic reactivity of C 2 S in the presence of sulfur.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of sulfur on the polymorphism and reactivity of dicalcium silicate of Portland clinker

Andrade¹,

Gomes²,

Pecchio³

et al. 2011

Cerâmica

View full text Add to dashboard Cite

The present study regards the effect of sulfur in dicalcium silicate (Ca 2 SiO 4 ), a major crystalline phase (20 to 40 wt.%) of the ordinary Portland cement clinker. Dicalcium silicate is also known as C 2 S (2CaO.SiO 2 ) or belite. The synthesis of the C 2 S samples was made with high purity reactants with addition of sulfur as CaSO 4 .2H 2 O, mixed according to the stoichiometric proportion 2Ca:(1-x)Si:xS, in which x corresponds to the cationic proportion of sulfur, with values ranging from 0 to 20%. Added amounts of SO 3 in the samples were 0.23, 1.39, 2.77, 4.60 and 9.71wt.%. Chemical composition of the samples was determined by X-ray fl uorescence before and after sintering. Large-scale sulfur loss by volatilization leads to an excess in calcium and consequently to formation of increasing amounts of tricalcium silicate with increasing sulfur content in the starting mixture. Mineralogical composition of the samples and cell parameters of C 2 S polymorphs were determined by X-ray diffraction and Rietveld refi nements. Structural analysis of diffraction data indicates that the presence of sulfur stabilizes the intermediate temperature polymorph β C 2 S, with increasing unit cell volume. The reactivity with water (heat of hydration) of the samples was measured by differential scanning calorimetry, which was strongly infl uenced by the highly reactive tricalcium silicate.

show abstract

Section: Introductionmentioning

confidence: 99%

“…SiO 2 .nH 2 O). Further effects of sulfur on clinker mineralogy comprise polymorphism of dicalcium silicate and, threfore, its reactivity with water [7]. C 2 S has fi ve polymorphs: γ, β, α L , α H and α, in order of stability at increasing temperature [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of sulfur on the polymorphism and reactivity of dicalcium silicate of Portland clinker

Andrade¹,

Gomes²,

Pecchio³

et al. 2011

Cerâmica

View full text Add to dashboard Cite

show abstract

“…composition reported in Table 2, as its Na 2 O content is quite high, 1.4 wt.%. Na 2 O is known to stabilize α-forms of belite [64,65]. III) CS quantified in ALIPRE®, S.A.cement and CSA_trial is the high temperature polymorph, anhydrite-II [48].…”

Section: Tablementioning

confidence: 99%

Rietveld quantitative phase analysis of Yeelimite-containing cements

Álvarez-Pinazo

Cuesta

García-Maté

et al. 2012

Cement and Concrete Research

201

View full text Add to dashboard Cite

“…These disadvantages can be overcome in two complementary ways: i) producing BSA cements, with C 4 A 3 $ [also named as Klein´s salt] [6,7] and ii) stabilizing high temperature belite polymorphs ( -forms) [8][9][10][11]. Recently, a class of iron-rich BSA cements has been proposed by Lafarge [12], in which activation is promoted by both strategies already mentioned.…”

Section: Introductionmentioning

confidence: 99%