A hydration study of various calcium sulfoaluminate cements

Telesca, Antonio; Marroccoli, Milena; Pace, Maria Lucia; Tomasulo, Michele; Valenti, Gian Lorenzo; Monteiro, Paulo J.M.

doi:10.1016/j.cemconcomp.2014.07.002

Cited by 220 publications

(98 citation statements)

References 48 publications

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“…Especially the high temperature chemistry of clinker production [119,120] and the hydration of the BC$A and C$A cements [121][122][123] are the focus of research. But also the possibility to include fly ash into C$A cements in order to reduce CO 2 footprint has been evaluated [124,125].…”

Section: Calcium Sulfoaluminate Cements (C$a)mentioning

confidence: 99%

Research review of cement clinker chemistry

Ludwig

Zhang

2015

Cement and Concrete Research

231

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Section: Calcium Sulfoaluminate Cements (C$a)mentioning

confidence: 99%

Research review of cement clinker chemistry

Ludwig

Zhang

2015

Cement and Concrete Research

231

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“…and hydrated calcium silicate gels (C‐S‐H) [eq. ]

C_{4} A_{3} \overset{S}{true} + 2 normalC \overset{S}{true} + 38 H_{2} normalO \to C_{3} normalA \cdot 3 normalC \overset{S}{true} \cdot 32 normalH ((), AFt) + 2 normalA H_{3}

C_{4} A_{3} \overset{S}{true} + 18 normalH \to C_{3} normalA \cdot normalC \overset{S}{true} \cdot 18 normalH ((), AFm) + 2 normalA H_{3}

3 normalC H_{2} + normalA H_{3} + 3 normalC \overset{S}{true} + 26 normalH \to C_{3} normalA \cdot 3 normalC \overset{S}{true} \cdot 32 normalH

2 C_{2} normalS + 4 normalH \to 3 CaO \cdot 2 Si O_{2} \cdot 3 H_{2} normalO ((), normalC - normalS - normalH) + normalC H_{2}

…”

Section: Resultsmentioning

confidence: 99%

Water‐swellable, tough, and stretchable inorganic–organic sulfoaluminate cement/polyacrylamide double‐network hydrogel composites

Chu

Song

Zhao

2019

J of Applied Polymer Sci

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Effectively improving the mechanical properties of the hydrogel can greatly broaden its application range. The design concept of forming a double-network structure by organic-inorganic hybridization can greatly enhance the mechanical properties of traditional hydrogels. Here, a series of organic-inorganic double-network (OIDN) polyacrylamide/(sulfoaluminate cement) (PAM/SAC) composite gels by solution polymerization were synthesized at room temperature. The OIDN composite gels not only retain the characteristics of water swelling but also exhibit excellent tensile properties (stress and strain are 12 MPa and 2500%, respectively) and compressive strength (stress and strain are 65 MPa and 80%, respectively). In the preparation process, a brittle inorganic network of hydrated sulfoaluminate (hydra-SAC) and a ductile network of polyacrylamide (PAM) were formed by the manner of interpenetrating. The phase composition and thermal stability of the OIDN composite gels were characterized and determined by FTIR, XRD, SEM, and TGA, respectively. The effect of SAC on swelling and mechanical performance of the OIDN composite gels was also investigated. The results show that the use of SAC hybrid hydrogels can effectively improve the mechanical strength, and the OIDN composite gels are expected to be a potential grouting and plugging functional material.

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“…There is some controversy in the literature data about the hydration behaviour of ye'elimite in absence of other soluble sulphate groups [10][11][12]. In addition, belite reactivity is important, especially for BYF and BAY cements.…”

Section: Cmss-2017mentioning

confidence: 99%

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

et al. 2018

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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).

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A hydration study of various calcium sulfoaluminate cements

Cited by 220 publications

References 48 publications

Research review of cement clinker chemistry

Research review of cement clinker chemistry

Water‐swellable, tough, and stretchable inorganic–organic sulfoaluminate cement/polyacrylamide double‐network hydrogel composites

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

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