Sodium silicate-based alkali-activated slag mortars

Brough, Adrian R.; Holloway, Miles; Sykes, J. M.; Atkinson, A.

doi:10.1016/s0008-8846(00)00356-2

Cited by 160 publications

(44 citation statements)

References 6 publications

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“…Some admixtures used as setting accelerators in Portland cement systems have the opposite effect when used in alkali-activated materials. Brought et al [4] investigated that the addition of NaCl significantly retarded both setting and strength development at high levels, but at low addition levels, i.e. , 4% or less by weight of slag, NaCl acted as an accelerator.…”

Section: Introductionmentioning

confidence: 99%

Effect of Na3PO4 on the Hydration Process of Alkali-Activated Blast Furnace Slag

et al. 2016

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In recent years, the utilization of different non-traditional cements and composites has been increasing. Alkali-activated cementitious materials, especially those based on the alkali activation of blast furnace slag, have considerable potential for utilization in the building industry. However, alkali-slag cements exhibit very rapid setting times, which are too short in some circumstances, and these materials cannot be used for some applications. Therefore, it is necessary to find a suitable retarding admixture. It was shown that the sodium phosphate additive has a strong effect on the heat evolution during alkali activation and effectively retards the hydration reaction of alkali-activated blast furnace slag. The aim of the work is the suggestion of a reaction mechanism of retardation mainly based on Raman and X‑ray photoelectron spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Effect of Na3PO4 on the Hydration Process of Alkali-Activated Blast Furnace Slag

et al. 2016

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“…The second DTA endothermic peak at 146°C is due to ionically hydrated water released from the sodium silicate system. The exothermic peak at 352°C represents the release of structural water and joining of polysilicates by condensation of SiOH groups to form −Si-O-Si-groups [6,17]. The endothermic peak with maximum at about 590°C is present in all PS-A samples (see Fig.…”

Section: Intumescent Silicate Matricesmentioning

confidence: 90%

“…The intumescence of the alkali-metal silicate internal layer results from rapid liberation of water vapour on exposure to high temperatures. Water-soluble sodium silicate is obtained by reacting silica with sodium or potassium carbonate [6,7] or bicarbonate, maintaining SiO 2 :Na 2 O molar ratios (R) from 1.6 to 3.9. As the ratio R (SiO 2 /Na 2 O) increases, pH value decreases [7].…”

Section: Introductionmentioning

confidence: 99%

Fibre-reinforced glass/silicate composites: effect of fibrous reinforcement on intumescence behaviour of silicate matrices as a fire barrier application

2015

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“…The hydration process of the OPC is based on five periods that can be varied by the application of a retarder like various types of sugar or, in particular, carboxylic acid such as d -gluconic acid [17,18,20,21,23,31,32,33,34,35]. According to the type and concentration of the retarder, the dormant period can take several times longer than the primary duration in comparison to the state without retarder [10,20,23,36,37,38].…”

Section: Introductionmentioning

confidence: 99%

Studying the Hydration of a Retarded Suspension of Ground Granulated Blast-Furnace Slag after Reactivation

Schneider

Stephan

2016

Materials

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This article presents a combined use of a retarder (d-gluconic acid) and an alkaline activator (sodium hydroxide) in a binder system based on ground granulated blast-furnace slag. The properties of the retarder are extending the dormant hydration period and suppressing the generation of strength-giving phases. Different retarder concentrations between 0.25 and 1.00 wt.% regulate the intensity and the period of the retardation and also the characteristics of the strength development. The activator concentration of 30 and 50 wt.% regulates the overcoming of the dormant period and thereby the solution of the slag and hence the formation of the hydration products. The research objective is to produce a mineral binder system based on two separate liquid components. The highest concentration of retarder and activator generates the highest compressive strength and mass of hydration products—after 90 days of hydration a compressive strength of more than 50 N/mm2. The main phases are calcium silicate hydrate and hydrotalcite. Generally, the combination of retarder and activator shows a high potential in the performance increase of the hydration process.

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Sodium silicate-based alkali-activated slag mortars

Cited by 160 publications

References 6 publications

Effect of Na3PO4 on the Hydration Process of Alkali-Activated Blast Furnace Slag

Effect of Na3PO4 on the Hydration Process of Alkali-Activated Blast Furnace Slag

Fibre-reinforced glass/silicate composites: effect of fibrous reinforcement on intumescence behaviour of silicate matrices as a fire barrier application

Studying the Hydration of a Retarded Suspension of Ground Granulated Blast-Furnace Slag after Reactivation

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