Recycling Polyurethane Foam and its Use as Filler in Renovation Mortar with Thermal Insulating Effect

Václavík, Vojtěch; Dvorský, Tomáš; Dirner, Vojtech; Daxner, Jaromír; Valíček, Ján; Harničárová, Marta; Kušnerová, Milena; Koštial, Pavel; Bendová, Miroslava

doi:10.1007/978-3-642-37469-2_6

Cited by 9 publications

(10 citation statements)

References 5 publications

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“…It is impossible to search for the ideal environment for the reaction by adding sufficient alkalis, because its content in activator is below 1 % of weight. Therefore, it was decided for fully experimental method, where in the first part of experiment, only a small sample of binder and activator behavior was monitored in a lab, especially the setting time and consistency of the mixture [7].…”

Section: Methodology Of Sample Preparationmentioning

confidence: 99%

Alkali Activation of Blast Furnace Slag by Various Types of Activators

Mec

Boháčová

Koňařík

et al. 2015

SSP

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Alkali-activated systems, formed by the alkaline activation are inorganic materials characterized by the potential of ecological use. The objective of experiment was to investigate the influence of different activators on selected properties of alkali-activated systems based on granulated blast furnace slag. At the beginning of the experiment, 21 different samples prepared of 12 types of activators were tested to the basic properties. Then, selected samples with the best potencial to use were tested to compressive and flexural strength, frost resistance and surface resistance to chemical de-icing substances. The initial setting time achieved 25 - 95 minutes and final setting time achieved 30 - 105 minutes, compressive strengths were in the range 40 - 100MPa, frost resistance and resistance of surface to water and defrosting chemicals were confirmed.

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Section: Methodology Of Sample Preparationmentioning

confidence: 99%

Alkali Activation of Blast Furnace Slag by Various Types of Activators

Mec

Boháčová

Koňařík

et al. 2015

SSP

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“…GGBFS has been used in the cement industry as a clinker substitute material in the amount of 35-95 wt.%. According to the European standard, the cement produced using GGBFS belongs to the CEM III type A-C [13][14][15]. The main properties of this type of blended cement are low heat of hydration, low compressive strength in the early phase of hydration, and very good resistance to aggressive sulphate environment [16,17].…”

Section: Introductionmentioning

confidence: 99%

The Influence of GGBFS as an Additive Replacement on the Kinetics of Cement Hydration and the Mechanical Properties of Cement Mortars

Jozić,

Ljubičić,

Petrović

et al. 2023

Buildings

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Granulated blast furnace slag (GBFS) is a byproduct of the iron production process. The objective of this study is to determine the effects of ground granulated blast furnace slag (GGBFS), used as a replacement admixture (0–40 wt.%) for ordinary Portland cement (OPC), on the setting time, the heat of hydration, and the mechanical properties of cement mortar. The influence of GGBFS as a replacement additive on the setting time shows that it has an accelerating effect on cement hydration. Calorimetric measurements were performed on the cement paste system to determine the effects of GGBFS on the hydration of OPC. Calorimetric measurements carried out show that the replacement of GGBFS in an amount up to 40 wt.% reduces the total heat of hydration by up to 26.36% compared to the reference specimen. The kinetic analysis performed on the calorimetric data confirms the role of GGBFS as an accelerator by shortening the time during which the process of nucleation and growth (NG), as the most active part of hydration, is reduced up to 2.5 h. The value of the Avrami–Erofee constant indicates polydispersity and heterogeneous crystallization. Mechanical tests of cement mortars were performed after 3, 7, 14, 28, 70, and 90 days of hydration and showed that replacement addition of GGBFS slightly reduced the mechanical properties in the early phase of hydration, while in the later phase of hydration it contributed to an increase in the mechanical properties.

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“…[1] For the blast furnace slag, its metallurgical function is mainly to control the chemical composition of hot metal. [2] For converter slag, its metallurgical function is mainly to remove P and S from the metal liquid, reduce the degree of erosion of refractory materials, disperse metal droplets to create favorable conditions for decarburization, prevent large heat losses and reduce metal spattering, prevent the absorption of harmful gases in the steel liquid and adsorb minor nonmetallic inclusions from external and internal sources. [3] For the refining slag, its metallurgical function is mainly to desulfurize and deoxidize, absorb inclusions, maintain steel temperature, and prevent the steel from absorbing air.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Analysis of the Structural Behavior of Aluminum Ion in the Slag of CaO–SiO₂–Al₂O₃–Li₂O System

Jiao,

Guo,

Chen

et al. 2023

steel research int.

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To further understand the structural behavior of Al3+ in the CaO‐SiO2‐Al2O3‐Li2O system melt, molecular dynamics simulations were used to analyze the microstructure of the melt under different basicity conditions. The results showed that the bond length of Al‐O was longer than that of Si‐O and was less stable than Si‐O. The stability of the [AlO4]5‐ tetrahedral structure was lower than that of the [SiO4]4‐ tetrahedral structure. With the increase of basicity, there was almost no effect on the Si‐O bond, but it caused the bond length of Al‐O to shorten and the bond length of Ca‐O to increase. At the same time, this led to the breakdown of complex aluminum‐oxygen ion clusters and the increase of the distance between O‐O atomic pairs. With the increase of basicity, the decrease in system energy promoted the gradual regularization of high‐coordinated Al ions under sufficient cation conditions, so that complex structures, such as O(Al,Al,Si) and O(Al,Al,Al), were transformed into simple structures, such as Al‐O‐Al, and the average value of the O‐Al‐O bond angle was closer to the ideal tetrahedral bond angle, and the proportion of tetrahedra increased. When the melt aggregation degree decreased, if two adjacent [AlO4]5‐ tetrahedra were connected by the same O, the distance between them would become larger, which also caused the average value of the Al‐O‐Al bond angle to gradually increase. The [SiO4]4‐ tetrahedra were more likely to be combined with [AlO4]5‐ tetrahedra. At the same time, the degree of decrease in Si‐O‐Al was not as great as that of Si‐O‐Si. CaO preferentially dissociates to provide O2‐, which in turn depolymerizes the Si‐O‐Si network structure to form non‐bridging oxygen Si‐O, and when basicity is sufficient, it will substantially depolymerize Si‐O‐Al to form Si‐O and Al‐O.This article is protected by copyright. All rights reserved.

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Recycling Polyurethane Foam and its Use as Filler in Renovation Mortar with Thermal Insulating Effect

Cited by 9 publications

References 5 publications

Alkali Activation of Blast Furnace Slag by Various Types of Activators

Alkali Activation of Blast Furnace Slag by Various Types of Activators

The Influence of GGBFS as an Additive Replacement on the Kinetics of Cement Hydration and the Mechanical Properties of Cement Mortars

Molecular Dynamics Analysis of the Structural Behavior of Aluminum Ion in the Slag of CaO–SiO₂–Al₂O₃–Li₂O System

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Recycling Polyurethane Foam and its Use as Filler in Renovation Mortar with Thermal Insulating Effect

Cited by 9 publications

References 5 publications

Alkali Activation of Blast Furnace Slag by Various Types of Activators

Alkali Activation of Blast Furnace Slag by Various Types of Activators

The Influence of GGBFS as an Additive Replacement on the Kinetics of Cement Hydration and the Mechanical Properties of Cement Mortars

Molecular Dynamics Analysis of the Structural Behavior of Aluminum Ion in the Slag of CaO–SiO2–Al2O3–Li2O System

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Product

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About

Molecular Dynamics Analysis of the Structural Behavior of Aluminum Ion in the Slag of CaO–SiO₂–Al₂O₃–Li₂O System