The effect of gyrolite additive on the hydration properties of Portland cement

Eisinas, Anatolijus; Baltakys, K.; Šiaučiūnas, R.

doi:10.1016/j.cemconres.2011.07.003

Cited by 24 publications

(15 citation statements)

References 41 publications

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“…In previous work (Eisinas et al, 2012) it was proved that the synthetic gyrolite as an additive accelerates tricalcium silicate hydration and also changes the hydration mechanism of cement samples, because in the samples with 7 . 5% of additive the evaluated reaction order n app grew about 2 .…”

Section: Resultsmentioning

confidence: 99%

“…5% additive, the maximum adsorption capacity of gyrolite substituted with cadmium ions for the alkaline and alkaline earth ions was reached after 8-9 h of hydration, because the amount of cumulative heat started to decrease (until it reached ,60 J/g) and achieved the same level as pure OPC samples (Figure 6(a)). Meanwhile, in previous work (Eisinas et al, 2012) it was determined that pure synthetic gyrolite additive, due to its adsorption properties, has a positive influence on the cumulative heat of OPC samples under all experimental conditions. Meanwhile, in the OPC samples with 5% or 7 .…”

Section: Advances In Cement Researchmentioning

confidence: 99%

“…Presumably, this additive can affect the early hydration of OPC samples. As these reactions are exothermic, isothermal calorimetry is among the most accurate methods to monitor the global reaction process through the rate of heat production (Eisinas et al, 2012;Jansen et al, 2012;Juilland et al, 2010;Kumar et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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The effect of gyrolite substituted with cadmium ions on the hydration kinetics of OPC at early stages

Baltakys¹,

Eisinas²,

Šiaučiūnas³

2014

Advances in Cement Research

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The effect of gyrolite substituted with cadmium ions on the hydration kinetics of OPC at early stages Baltakys, Eisinas and Siauciunas This study examined the effect of gyrolite substituted with cadmium ions on the kinetics of the hydration of ordinary Portland cement (OPC) at early stages of hydration. Gyrolite was synthesised after 48 h at 2008C from a stoichiometric composition (calcium oxide/silica dioxide 0 . 66) of calcium oxide and a hydrated silica mixture. Calcium silicate hydrate substituted with cadmium ions (97 mg cadmium ions/g) was added as a partial replacement of the OPC at levels of 0%, 2 . 5%, 5% and 7 . 5% by weight of the total cementitious material. Therefore, the water-to-cement ratio of all OPC samples was 0 . 5. It was found that the additive of a synthetic contaminated with cadmium ions (,97 mg cadmium ions/g) retained very good adsorption properties for the alkaline and alkaline earth ions that penetrated into the gyrolite structure. It was estimated that this additive accelerates the early stage (5-7 h) of hydration of OPC and its individual compounds. It was found that during the main reaction of calcium silicate, the additive of gyrolite contaminated with cadmium ions had no influence on the apparent reaction rate (W app ) of the hydration process (7-12 h): in all samples, the increase in the degree of hydration (˜AE) was almost the same:˜AE 15%. Notation c concentration k app reaction rate n app evaluated reaction order S a specific surface area T time W app apparent reaction rate X ô amount of tricalcium silicate that reacted AE degree of hydration

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Section: Resultsmentioning

confidence: 99%

Section: Advances In Cement Researchmentioning

confidence: 99%

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The effect of gyrolite substituted with cadmium ions on the hydration kinetics of OPC at early stages

Baltakys¹,

Eisinas²,

Šiaučiūnas³

2014

Advances in Cement Research

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“…Previous work examined the influence of gyrolite additives on the hydration properties of OPC (Eisinas et al, 2011). It was determined that the addition of gyrolite increases both the heat evolution rate and the amount of heat hydration of OPC samples.…”

Section: Introductionmentioning

confidence: 99%

Utilisation of gyrolite with impure Cd²⁺ ions in cement stone

Eisinas

Baltakys

Šiaučiūnas

2013

Advances in Cement Research

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This study examined the adsorption capacity of gyrolite for Cd 2 ions in acidic and alkaline solutions and the influence of this compound on the hydration of ordinary Portland cement (OPC). In addition, this paper presents the utilisation scheme of gyrolite with impure Cd 2 ions in the cement stone. It was determined that the Cd(NO 3 ) 2 solution substitution isomorphism is typical of gyrolite because ,33% (in solution at a pH of 5 . 96) and ,22% (in solution at a pH of 8 . 70) of Cd 2 ions participate in the substitution/chemical reaction (gyrolite-Ca 0 Cd 2 $ gyroliteCd 0 Ca 2 ), whereas the rest of these ions are present in gyrolite according to an additional interaction. It was estimated that the addition of adsorbents substituted with Cd 2 ions had no substantial effect on the mineralogical composition of OPC samples. It was also noted that Cd 2 ions were bound in the cement stone under all experimental conditions.

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“…The mineral, gyrolite, is one of these C-S-H with the most likely chemical formula Ca 16 Si 24 O 60 (OH) 8 [25][26][27]. This compound is commonly found in volcanic and basaltic rocks, in voids or gaps, and it exists only with related minerals.…”

Section: Introductionmentioning

confidence: 99%

The effect of gyrolite structure properties on Zn²⁺ion adsorption

Iljina¹,

Baltakys

Eisinas

2014

Desalination and Water Treatment

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A B S T R A C TThe effect of gyrolite structure properties on Zn 2+ ion adsorption in an alkaline solution was determined. Gyrolite was synthesized for 32, 48, 72, 120, and 168 h at 200˚C from a stoichiometric composition (molar ratio of C/S = 0.66) of the initial CaO and SiO 2 ·nH 2 O mixtures. It was established that gyrolite does not regroup into related compounds, when the hydrothermal synthesis duration was varied from 32 to 168 h, although its structure changed as the duration of the synthesis was prolonged. Also, the adsorption capacity of gyrolite for Zn 2+ ions depends on the structural properties of the adsorbent. By prolonging the duration of synthesis from 32 h to 168 h, the adsorption capacity of gyrolite decreased from 99% (29.92 mg Zn 2+ /g) to 93% (27.91 mg Zn 2+ /g). It was found that the adsorption reactions are not reversible processes, and follow by a pseudo-second-order model. X-ray diffraction analysis showed that the crystal structure of gyrolite remained stable after the adsorption processes.

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The effect of gyrolite additive on the hydration properties of Portland cement

Cited by 24 publications

References 41 publications

The effect of gyrolite substituted with cadmium ions on the hydration kinetics of OPC at early stages

The effect of gyrolite substituted with cadmium ions on the hydration kinetics of OPC at early stages

Utilisation of gyrolite with impure Cd²⁺ ions in cement stone

The effect of gyrolite structure properties on Zn²⁺ion adsorption

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The effect of gyrolite additive on the hydration properties of Portland cement

Cited by 24 publications

References 41 publications

The effect of gyrolite substituted with cadmium ions on the hydration kinetics of OPC at early stages

The effect of gyrolite substituted with cadmium ions on the hydration kinetics of OPC at early stages

Utilisation of gyrolite with impure Cd2+ ions in cement stone

The effect of gyrolite structure properties on Zn2+ion adsorption

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Product

Resources

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Utilisation of gyrolite with impure Cd²⁺ ions in cement stone

The effect of gyrolite structure properties on Zn²⁺ion adsorption