New applications of calcium sulfoaluminate cement

Péra, J.; Ambroise, J.

doi:10.1016/j.cemconres.2003.10.019

Cited by 320 publications

(128 citation statements)

References 4 publications

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“…In addition, other phases, such as C 2 S, CA, C 4 AF, CSH 2 , CSH 0.5 , CS, and so on, may also be present in their composition [7]. The main performances of these eco-cements are high early strength, fast setting time, good chemical resistance and, depending on the amount of the added sulfate, these cements can also be used as constituents of self-leveling materials [8,9,10,11]. Three steps take place during the hydration of cement pastes: the dissolution of anhydrous phases, the precipitation of new phases, and the consumption of free water.…”

Section: Introductionmentioning

confidence: 99%

Tailored setting times with high compressive strengths in bassanite calcium sulfoaluminate eco-cements

García-Maté

Londoño-Zuluaga

Torre

et al. 2016

Cement and Concrete Composites

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This work deals with the hydration of a calcium sulfoaluminate (CSA) eco-cement prepared with bassanite and different additives (type and content) at a fixed water/CSA ratio of 0.5. Pastes prepared with bassanite show high water demands, high viscosity values and short initial setting times which are related to the fast dissolution rate of bassanite and the subsequent precipitation of gypsum. These facts have a dramatic effect onto the mechanical strength values, and make necessary the addition of additives.Here, the addition of different amounts of specific retarders (polycarboxylate, tartaric acid and phosphonic acid) not only improved the workability of pastes and mortars, but also delayed the setting time, by modifying the dissolution rates of the phase(s), and improved mechanical strengths.Finally, mortars with high compressive strengths (46 and 84 MPa at 1 and 7 days of hydration, respectively) and, chiefly, tailored setting times with high strengths have been prepared.

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Section: Introductionmentioning

confidence: 99%

Tailored setting times with high compressive strengths in bassanite calcium sulfoaluminate eco-cements

García-Maté

Londoño-Zuluaga

Torre

et al. 2016

Cement and Concrete Composites

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“…In addition, they show interesting properties such as high early-age strengths [6][7][8], short setting times, impermeability [9,10], sulfate and chloride corrosion resistance and low alkalinity. The main uses of these CSA cements, or blended with Portland cements, are for quick repairs and pre-cast products or floor concrete applications [11]. All these properties are related to the resulting hydration phases at the first hours of hydration.…”

Section: Introductionmentioning

confidence: 99%

Hydration studies of calcium sulfoaluminate cements blended with fly ash

García-Maté

Torre

León‐Reina

et al. 2013

Cement and Concrete Research

171

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The main objective of this work is to study the hydration and properties of calcium sulfoaluminate cement pastes blended with fly ash (FA) and the corresponding mortars at different hydration ages. Laboratory X-ray powder diffraction, rheological studies, thermal analysis, porosimetry and compressive strength measurements were performed. The analysis of the diffraction data by Rietveld method allowed quantifying crystalline phases and overall amorphous contents. The studied parameters were: i) FA content, 0, 15 and 30 wt.%; and ii) water addition, water-to-CSA mass ratio (w/CSA = 0.50 and 0.65), and water-to-binder mass ratio (w/b = 0.50). Finally, compressive strengths after 6 months of 0 and 15 wt.% FA [w/CSA = 0.50] mortars were similar: 73 ± 2 and 72 ± 3 MPa, respectively. This is justified by the filler effect of the FA as no strong evidences of reactivity of FA with CSA were observed. These results support the partial substitution of CSA cements with FA with the economic and environmental benefits.

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“…These are iron-rich BSA cements produced at ~1250ºC and they are characterized by rapid hardening, excellent durability, self-stressing and volume stability, depending on the amount of gypsum added [18]. Alternatively, in order to further enhance mechanical strengths at very early ages, i. e. <1 day, C 4 AF phase may be substituted by C 12 A 7 , although an increase of ~100ºC in the maximum burning temperature is needed and the durability with respect to sulfate attack is limited [19,20].…”

Section: Introductionmentioning

confidence: 99%