The effect of gypsum on the hydration of alite–belite–ferrite phase system

Li, Chuanhai; Lu, Xiaolei; Jing, Guojian; Ye, Zhengmao; Wang, Shuxian; Cheng, Xin

doi:10.1007/s10973-018-7643-7

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…Sulfate ions from gypsum (CaSO 4 ·2H 2 O) influence the reaction of C 3 A and Ca(OH) 2 (CH, portlandite), to form ettringite(C 6 AtrueS¯ 3 H 32 ). Gypsum is mainly used as a cement setting time regulator [5].…”

Section: Introductionmentioning

confidence: 99%

Application of Isothermal and Isoperibolic Calorimetry to Assess the Effect of Zinc on Hydration of Cement Blended with Slag

et al. 2019

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This work deals with the influence of zinc on cement hydration. The amount of zinc in cement has increased over recent years. This is mainly due to the utilization of solid waste and tires, which are widely used as a fuel in a rotary kiln. Zinc can also be introduced to cement through such secondary raw materials as slag, due to increased recycling of galvanized materials. The aim of this work was to determine the effect of zinc on the hydration of Portland cement, blended with ground blast furnace slag (GBFS). This effect was studied by isothermal and isoperibolic calorimetry. Both calorimetry methods are suitable for measurements during the first days of hydration. Isoperibolic calorimetry monitors the hydration process in real-life conditions, while isothermal calorimetry does so at a defined chosen temperature. Zinc was added to the cement in the form of two soluble salts, namely Zn(NO3)2, ZnCl2, and a poorly soluble compound, ZnO. The concentration of added zinc was chosen to be 0.05, 0.1, 0.5, and 1mass percent. The amount of GBFS replacement was 15% of cement dosage. The newly formed hydration products were identified by X-ray diffraction method (XRD).

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Section: Introductionmentioning

confidence: 99%

Application of Isothermal and Isoperibolic Calorimetry to Assess the Effect of Zinc on Hydration of Cement Blended with Slag

et al. 2019

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“…The current understanding as regards the parallel hydration/interaction of tricalcium silicate, tricalcium aluminate and sulfate (from gypsum, bassanite or anhydrite) in real-life properly sulfated Portland cement systems can be found in review papers, e.g., [4,32], in [1,13] or [7,20,21], with the latter authors considering different curing temperatures. Several reaction peaks can be observed from calorimetric data: -The initial reaction (first hour) and associated ''dissolution peak'' are only marginally influenced by the curing temperature (see Fig.…”

Section: Investigated Materials and Calorimetric Datamentioning

confidence: 99%

Engineering hydration model for ordinary Portland cement based on heat flow calorimetry data

Schmid

Pichler

Lackner

2019

J Therm Anal Calorim

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The reaction kinetic of Portland cement was characterized by heat flow calorimetry, with the experiments conducted at different, constant, curing temperatures. With these data at hand, Ulm and Coussy's classical rate law is extended toward a variable activation energy, reflecting that several sub-reactions take place in parallel/subsequently, what, finally, gives access to an engineering model for hydration kinetics suitable for application in thermochemical analyses of concrete structures at an early age.

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“…The main phases formed during the production of cement are tricalcium silicate (C3S -3CaO•SiO2 or Ca3SiO5, alite), dicalcium silicate (C2S -2CaO•SiO2 or Ca2SiO4, belite), tricalcium aluminate (C3A -3CaO•Al2O3 or Ca3Al2O6, celite) and calcium aluminoferrite (C4AF -4CaO•Al2O3•Fe2O3 or Ca4Al2Fe2O10, brownmillerite) [1][2][3]. Gypsum (CaSO4•2H2O) is added to clinker as a setting agent, which reacts with C3A and Ca(OH)2 (CH, portlandite) to form ettringite (C6A S 3H32) [4].…”

Section: Introductionmentioning

confidence: 99%

Possibilities of Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash

Šiler¹,

Kolářová²,

Novotný³

et al. 2020

Preprint

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Increasing utilization of secondary raw materials and alternative fuels results in increasing contents of metals in cements. One of elements, the content of which keeps rising in cement is zinc. It comes to cement with secondary raw materials such as slag or fly ash or by the utilization of used tires as an alternative fuel. Zinc ions significantly prolong the hydration process in cement. This work deals with the influence of zinc ions in the form of very poorly soluble ZnO salt and easily soluble ZnCl2 and Zn(NO)3 on the hydration of cement blended with fly ash. Zinc was dosed in the range of 0.05, 0.1, 0.5 a 1% of cement weight. Final products were next analyzed using X-Ray Diffraction.

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The effect of gypsum on the hydration of alite–belite–ferrite phase system

Cited by 10 publications

References 22 publications

Application of Isothermal and Isoperibolic Calorimetry to Assess the Effect of Zinc on Hydration of Cement Blended with Slag

Application of Isothermal and Isoperibolic Calorimetry to Assess the Effect of Zinc on Hydration of Cement Blended with Slag

Engineering hydration model for ordinary Portland cement based on heat flow calorimetry data

Possibilities of Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash

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