Alkali silicate binders: effect of SiO2/Na2O ratio and alkali metal ion type on the structure and mechanical properties

Skorina, Taisiya; Тихомирова, И. Н.

doi:10.1007/s10853-012-6382-6

Cited by 11 publications

(16 citation statements)

References 18 publications

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“…The hydrolytic stability of the geopolymers is reflected in the stability of the aluminosilicate gel in aquatic conditions. Contact with water causes hydrolysis of Si-O-Si bonds in the gel and release of Si followed by partial degradation of the structure (30). The presence of Al ions in the leachate indicates a certain degree of dealumination due to the degradation of Al-O-Si bonds (31).…”

Section: Effect Of Naoh Concentration On Geopolymer Paste Propertiesmentioning

confidence: 99%

Characterization of the properties of perlite geopolymer pastes

2016

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This paper deals with the characterization of perlite-based geopolymer pastes, using fine perlite as raw material. The present study examined the effects of the main synthesis parameters such as perlite to activator ratio, NaOH concentration, the addition of soluble silica to the activator, and curing temperature on the setting time, the stability in an aquatic environment, the viscosity of the paste, and the compressive strength of the solidified geopolymers. The results showed that these inorganic polymer pastes are non-Newtonian shear thinning fluids that achieve low viscosities at high shear stresses. The optimum synthesis conditions for the geopolymer pastes proved to be a) a low initial NaOH concentration in the alkaline phase (2-5 M) and b) a solid to liquid ratio of 1.2-1.4 g/mL. If very fast setting is necessary, the pastes should be prepared with a soluble silica-doped alkaline activating phase and cured at high temperatures around 90 °C. RESUMEN: Caracterización de las propiedades de pastas geopoliméricas de perlita.El presente trabajo trata de la caracterización de pastas geopoliméricas basadas en perlita utilizando perlita fina como materia prima. Se han examinado los efectos que tienen los principales parámetros de síntesis -tales como la relación perlita/activador, la concentración de NaOH, la adición de sílice soluble al activador y la temperatura de curado-sobre el tiempo de fraguado, la estabilidad en medio acuoso, la viscosidad de la pasta y la resistencia a la compresión de los geopolímeros solidificados. Los resultados han mostrado que estas pastas poliméricas inorgánicas son fluidos no-Newtonianos de viscosidad estructural que alcanzan bajos niveles de viscosidad a alta tensiones de cizalla. Las condiciones óptimas de síntesis para las pastas geopoliméricas resultaron ser a) baja concentración inicial de NaOH en la fase alcalina (2-5 M) y b) una relación sólido-líquido entre 1,2 y 1,4 g/mL. Si se requiere fraguado muy rápido, se tienen que preparar las pastas con un activador alcalino dopado con sílice soluble y curar a altas temperaturas cercanas a los 90 °C.

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Section: Effect Of Naoh Concentration On Geopolymer Paste Propertiesmentioning

confidence: 99%

Characterization of the properties of perlite geopolymer pastes

2016

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“…Water‐glass‐based pastes satisfy the needs with respect to their high mechanical strength, good thermal stability, and fire resistance . They compose of water‐glass solution as binder and inorganic powders as fillers.…”

Section: Introductionmentioning

confidence: 99%

“…They compose of water‐glass solution as binder and inorganic powders as fillers. The water‐glass solution contains monomeric silica anions SiO x

{false(OH false)}_{4 - normalx}^{normalx -}

and internally condensed charged silica particles in equilibrium with Si(OH) 4 . The water‐glass bonding, attributable to hydrogen bond, can be realized at relatively low temperature and has high bonding strength .…”

Section: Introductionmentioning

confidence: 99%

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Influence of expansion admixtures on the properties of water‐glass‐based refractory pastes

Tao

Wang

Ren

et al. 2017

Int J Applied Ceramic Tech

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Water‐glass‐based pastes show good prospect for high‐temperature applications, but they are subject to substantial dry‐shrinkage. Silicon and aluminum powders were added to prevent the dry‐shrinkage. The influence of them on compressive strength, bonding strength and volume of the pastes was discussed. SEM, XRD, and TG/DSC were employed to study the influencing mechanisms. The results show that Si and Al effectively prevented the dry‐shrinkage; Al improved compressive strength and bonding strength, while Si was bad for bonding strength. When Al dosage was 6%, the pastes presented mild expansion of 1.05%, the compressive strength increased by 8.9%, and the bonding strength by 33.4%.

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“…7,8 Silicate adhesive has many performance advantages such as non-toxic, good temperature tolerance, high bonding strength, small bonding stress, and good operability, [9][10][11] often used for bonding materials such as metal, ceramic, glass, stone, soil, etc. [12][13][14][15][16] The application of silicate adhesive covers aerospace, machinery, electronics, chemical industry, construction, and other fields. However, the direct application of silicate in wood adhesive is still rare due to the defects of brittleness and water resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of curing technology on bonding properties of silicate wood adhesive

Zhang

Yang

Liu

2014

Materials Research Innovations

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In order to determine the best curing conditions of silicate wood adhesive, three different curing conditions, i.e. room temperature, moderate temperature, and high temperature were chosen to prepare poplar plywood with silicate adhesive and poplar veneer as raw materials. The optimised curing technology was obtained based on a lot of experimental analysis using the single factor test method and orthogonal test method. The research results showed that the curing conditions have obvious influence on the bonding properties. Compared with the samples which were cured at moderate or high temperature, the specimens cured at room temperature have higher bonding strength and water resistance. The dry and wet bonding strength of poplar plywood prepared from optimised curing technology was 0?89 and 0?61 MPa, respectively, and 24 h thickness swelling rate was 5?6%, these properties reached the Chinese National Standard of II Grade Plywood.

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Alkali silicate binders: effect of SiO2/Na2O ratio and alkali metal ion type on the structure and mechanical properties

Cited by 11 publications

References 18 publications

Characterization of the properties of perlite geopolymer pastes

Characterization of the properties of perlite geopolymer pastes

Influence of expansion admixtures on the properties of water‐glass‐based refractory pastes

Effect of curing technology on bonding properties of silicate wood adhesive

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