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

Stoleriu, Ştefania; Vlasceanu, Ioana Nicoleta; Dima, Cristina; Bădănoiu, Alina; Voicu, Georgeta

doi:10.3989/mc.2019.08518

Cited by 16 publications

(11 citation statements)

References 21 publications

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“…The materials obtained by the alkaline activation of waste glass powder with NaOH solution exhibit intumescent behavior [ 8 , 9 , 10 ]. In order to quantify the influence of the use of Ca(OH) 2 as an alkaline activator on the intumescence of these materials, samples were thermally treated in air at 600 °C and 800 °C for 1 h.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Alkali Activator Type on the Hydrolytic Stability and Intumescence of Inorganic Polymers Based on Waste Glass

Nicoara

Bădănoiu

2021

Materials

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The main objective of this study is the synthesis and characterization of low cost alkali-activated inorganic polymers based on waste glass (G-AAIPs) using a mixture of NaOH and Ca(OH)2 as alkali activators, in order to improve their hydrolytic stability. This paper also presents detailed information about the influence of composition determined by X Ray Diffraction (XRD), microstructure determined by Scanning Electronic Microscopy (SEM) and processing parameters on the main properties of G-AAIP pastes. The main factors analyzed were the glass fineness and the composition of the alkaline activators. The influence on intumescent behavior was also studied by heat treating of specimens at 600 °C and 800 °C. The use of Ca(OH)2 in the composition of the alkaline activator determines the increase of the hydrolytic stability (evaluated by underwater evolution index) of the G-AAIP materials compared to those obtained by NaOH activation. In this case, along with sodium silicate hydrates, calcium silicates hydrates (C-S-H), with good stability in a humid environment, were also formed in the hardened pastes. The highest intumescence and an improvement of hydrolytic stability (evaluated by underwater evolution index and mass loss) was achieved for the waste glass powder activated with a solution containing 70% NaOH and 30% Ca(OH)2. The increase of the waste glass fineness and initial curing temperature of G-AAIPs have a positive effect on the intumescence of resulted materials but have a reduced influence on their mechanical properties and hydrolytic stability.

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Section: Resultsmentioning

confidence: 99%

“…Intumescent silicate-based materials can be produced by the alkaline activation with NaOH solutions of waste glass powder with/without different admixtures [ 8 , 9 , 10 ]. As a result, municipal waste glass can be upcycled in the production of this type of materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of Alkali Activator Type on the Hydrolytic Stability and Intumescence of Inorganic Polymers Based on Waste Glass

Nicoara

Bădănoiu

2021

Materials

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“…They used the same equipment as in this paper, measuring three oven-dried samples per mix with measuring times of 10 minutes, and using a conductive paste. Anyway, the characterization of the thermal conduc- tivity is also important in other construction materials, such as gypsum (35), masonry materials (36) and even alkali activated materials (37). The scope of this research is to assess the influence of three important parameters, pre-conditioning of the specimens, measuring time, and the use of a conductive paste, on the measuring of the thermal conductivity with a particular hot-wire transient test method, the thermal needle probe.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the influence of the degree of saturation, measuring time and use of a conductive paste on the determination of thermal conductivity of normal and lightweight concrete using the hot-wire method

et al. 2021

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The determination of thermal conductivity of cement-based materials is relevant from the perspective of buildings’ energy efficiency. The absence of unified tests for its measurement in mortars and concrete results in a heterogeneity of the data available in the literature. This work’s purpose is to determine the relevant influence from a a statistical viewpoint that three factors; degree of saturation, measuring time and use of a conductive paste, have in the measurement of the conductivity using the hot-wire needle probe method in two concretes with different thermal behavior: standard-weight concrete and lightweight concrete. The results obtained allow for the establishment of recommendations for future researchers on the minimum information to be included in their reports of thermal conductivity of cement-based materials by the needle probe method, the need to treat outliers, the most favorable saturation conditions and measuring times, as well as the possible benefits of using conductive pastes.

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“…Nowadays, the most common thermal insulation materials are those based on organic compounds such as polyurethane and polystyrene; these organic materials have low densities and low values of thermal conductivity, but their main disadvantage is reduced fire resistance. Therefore, part of the research currently performed in this area focusses on the development of inorganic, fire-resistant thermal insulation materials [4][5][6]. Another topic related to the development of highly efficient and resistant thermal insulation materials is the incorporation of nanomaterials such as graphene oxide, nanocellulose or aerogels [2,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Lightweight Gypsum Materials with Potential Use for Thermal Insulations

et al. 2020

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This article presents the influence of three additions i.e., hydroxyethyl methyl cellulose (HEMC), sodium bicarbonate and flue gas desulfurization (FGD) gypsum on the porosity of gypsum-based materials. The specific microstructure for a material with good thermal insulation properties i.e., numerous closed pores distributed in the binding matrix, was achieved using HEMC (0.3 wt.%) and sodium bicarbonate (0.5–2 wt.%). The addition of HEMC to the gypsum binder determines, as expected, an increase of the porosity due to its ability to stabilize entrained air. In the case of a sodium bicarbonate addition, the pores are formed in the binding matrix due to the entrapment of the gas (CO2) generated by its reaction. Sodium bicarbonate addition delays the setting of gypsum binder therefore in this study FGD gypsum (waste produced in the desulfurization process of combustion gases generated in power plants) was also added to the mixture to mitigate this negative effect. The decrease of geometrical density (up to 13%, in correlation with the additive nature and dosage) correlated with the increase of the porosity, determines, as expected, the decrease of flexural and compressive strengths (33–75%), but improves the thermal properties i.e., decreases the thermal conductivity (9–18%).

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

Cited by 16 publications

References 21 publications

Influence of Alkali Activator Type on the Hydrolytic Stability and Intumescence of Inorganic Polymers Based on Waste Glass

Influence of Alkali Activator Type on the Hydrolytic Stability and Intumescence of Inorganic Polymers Based on Waste Glass

Evaluation of the influence of the degree of saturation, measuring time and use of a conductive paste on the determination of thermal conductivity of normal and lightweight concrete using the hot-wire method

Lightweight Gypsum Materials with Potential Use for Thermal Insulations

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