Hidratación de los cementos de aluminatos de calcio. Parte II: Efecto de las adiciones de sílice y alumina

Mercury, José Manuel Rivas; Aza, Antonio H. De; Turrillas, X.; Pena, P.

doi:10.3989/cyv.2003.v42.i6.623

Cited by 11 publications

(2 citation statements)

References 10 publications

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“…6e, spherical agglomerates of AH 3 of ca. 1 m within AH 3 gel could be neatly distinguished [33], whereas in Fig. 6f, C 3 AH 6 prismatic and tabular clusters of crystals of stable hydrates were seen.…”

Section: Mechanical Mineralogical and Microstructural Characterizatimentioning

confidence: 97%

A novel use of calcium aluminate cements for recycling waste foundry sand (WFS)

Navarro-Blasco

Fernández

Durán

et al. 2013

Construction and Building Materials

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The recycling of WFS in calcium aluminate cement mortars at high level of replacement (50%) was studied. Consistency and setting time were measured in fresh mortars. Two different curing conditions were used, the second one with the aim of enhancing the formation of stable cubic calcium aluminate hydrates. Compressive strength, pore size distribution and SEM examination were carried out to assess the effectiveness of CAC matrix in the recycling of WFS. The effect of the incorporation of a polymeric admixture -a chitosan derivative -was also explored. Leaching studies on hardened mortars of three target pollutants of the WFS (toxic metals Pb, Cr and Zn) were also done to evaluate their immobilization. By comparison with OPC mortars, the use of CAC showed several advantages, improving the compressive strength and the toxic metal retention.

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Section: Mechanical Mineralogical and Microstructural Characterizatimentioning

confidence: 97%

A novel use of calcium aluminate cements for recycling waste foundry sand (WFS)

Navarro-Blasco

Fernández

Durán

et al. 2013

Construction and Building Materials

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“…Because these solid solutions are also present in nature, mineralogists classify them as hibschite for the minerals with 0.2oxo1.5 and as katoite for the ones with 1.5oxo3. [16][17][18] The reaction of CAC with fly ash (FA) was also analyzed by Collepardi et al, 12 reaching the conclusion that FA is not suitable for reducing the transformation of hexagonal hydrates into the cubic phases. They said that it would be necessary to use a high content of FA (440%) in order to detect some effect in the conversion process, and this percentage of mineral addition in the formulation would cause an increase in the water/cement ratio, which would produce a decrease in the compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of Calcium Aluminate Cements Hydration with Silica Fume and Fly Ash Additions by Scanning Electron Microscopy, and Mid and Near‐Infrared Spectroscopy

López¹,

Calvo²,

Olmo³

et al. 2008

Journal of the American Ceramic Society

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Calcium aluminate cement (CAC) is less commonly used as ordinary Portland cements (OPCs) for structural concrete, is relatively expensive, but may have certain advantages when used for solidification of wastes; it introduces rapid strength gain and has a higher resistance to chemical attack than OPC. However, the most widely identified degradation process suffered by CAC is the so‐called conversion of hexagonal calcium aluminate hydrate to a cubic form. Mixes of CAC with silica fume (SF) or fly ash (FA) represent an interesting alternative for the stabilization of CAC hydrates, which might be attributed to a microstructure based mainly on aluminosilicates. This paper deals with the microstructure of cement pastes fabricated with binders of CAC–SF and CAC–FA, and their evolution over time. Mid infrared and near infrared spectroscopy have been used to assess the microstructure of these formulations. Microstructural characterization was completed by backscattering electron microscopy observation and microanalysis.

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