Synthesis and properties of alkali activated borosilicate inorganic polymers based on waste glass

Saadi, Taha H. Abood Al; Bădănoiu, Alina; Nicoara, Adrian Ionut; Stoleriu, Ştefania; Voicu, Georgeta

doi:10.1016/j.conbuildmat.2017.01.026

Cited by 32 publications

(14 citation statements)

References 16 publications

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“…The intumescent process is determined by the loss of water bound in sodium/potassium silicate/aluminate hydrates, compounds formed by the alkaline activation of WGP/fly ash; the water loss from sodium borate hydrate, resulted in the borax reaction with NaOH solution, contributes also to the intumescent process [11,12]. A confirmation of this process is provided by the important mass losses (ranging from 22% to 26%) recorded for thermally treated pastes ( fig.…”

Section: Resultsmentioning

confidence: 82%

“…The compressive strengths of AABSIP mortars ( fig.8) are in good correlation with their microstructure (figs. [9][10][11].…”

Section: Resultsmentioning

confidence: 99%

“…Volume and mass variations after thermal treatment were calculated using formulas (1) and (2) respectively [11,12]: (1) where: Vi = sample volume before heat treatment; Vf = sample volume after heat treatment. (2) where: mi = sample mass before thermal treatment; mf = sample mass after thermal treatment.…”

Section: Aabsips Preparationmentioning

confidence: 99%

“…Our research group reported in 2015 [9,10] the synthesis of alkali activated materials based on waste glass powder (WGP) with intumescent properties; this type of materials exhibit an important increase of volume when subjected to fire or thermal treatments at temperatures ranging from 600 to 800°C. In a subsequent study [11] AABSIPs were obtained by the alkaline activation of WGP with an alkaline activator based on NaOH solution with anhydrous borax addition; for this type of materials the activation temperature of intumescent process decreases up to 500 o C. However, a drawback in the synthesis of this type of materials is determined by the rapid loss of workability of fresh mixtures most probably due to the formation of sodium borate hydrate. On the other side, the presence of this compound was beneficial from the point of view of intumescent properties.…”

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confidence: 99%

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Alkali Activated Mortars with Intumescent Properties

Nicoara¹,

Bădănoiu²,

Balanoiu³

et al. 2019

Rev. Chim.

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The paper presents the properties of a new type of alkali activated borosilicate inorganic polymers (AABSIPs) resulted by the activation of waste glass powder and fly ash with alkaline solutions. The alkali activators used in this study were mixtures of borax decahydrate with NaOH and KOH solutions. For the preparation of AABSIP mortars two types of aggregates were used i.e. sand and a waste resulted during the mechanical processing of titanium alloy ingots. The thermal treatment of these pastes and mortars determines an intumescent process i.e. significant increase of volume; consequently, these materials could be used as low-cost fire stopper blocks for passive fire protection of buildings.

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Section: Resultsmentioning

confidence: 82%

“…The compressive strengths of AABSIP mortars ( fig.8) are in good correlation with their microstructure (figs. [9][10][11].…”

Section: Resultsmentioning

confidence: 99%

Section: Aabsips Preparationmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Alkali Activated Mortars with Intumescent Properties

Nicoara¹,

Bădănoiu²,

Balanoiu³

et al. 2019

Rev. Chim.

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“…AAM/geopolymer foams represent a new domain in research with high potential in producing thermal insulations (2,(10)(11)(12)(13)(14)(15). The cellular structure specific for these materials can be achieved using foaming agents such as: hydrogen peroxide, sodium borates, metallic powders (Zn or Al), surfactants, carbonates or sodium silicate (10)(11)(12)(13)(14)(15)(16).…”

Section: Introductionmentioning

confidence: 99%

Alkali activated materials based on glass waste and slag for thermal and acoustic insulation

et al. 2019

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Porous alkali activated materials (AAM), can be obtained from waste glass powder and slag mixtures by alkali activation with NaOH solution. To obtain an adequate porous microstructure, the hardened AAM pastes were thermally treated at temperatures ranging between 900°C and 1000°C, for 60 or 30 minutes. Due to the intumescent behaviour specific for this type of materials, an important increase of the volume and porosity occurs during the thermal treatment. The partial substitution of waste glass powder with slag, determines the increase of compressive strength assessed before (up to 37 MPa) and after (around 10 MPa) thermal treatment; the increase of slag dosage also determines the increase of the activation temperature of the intumescent process (above 950°C). The high porosity and the specific microstructure (closed pores with various shapes and sizes) of these materials recommend them to be utilised as thermal and acoustical insulation materials.

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