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https://doaj.org/article/6bf3e...
Article . 2019
Data sources: DOAJ
https://dx.doi.org/10.18720/mc...
Other literature type . 2019
Data sources: Datacite
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Structure, composition and properties of geopolymers from mineral wool waste

Структура, состав и свойства геополимеров из отходов минеральной ваты
Authors: Erofeev, Vladimir; Rodin, Alexander; Yakunin, Vladislav; Tuvin, Maksim;

Structure, composition and properties of geopolymers from mineral wool waste

Abstract

The waste generated during the mineral wool production makes up to 30 % of the finished product mass. These wastes can be used for producing building materials, in particular as raw materials for the production of geopolymers (alkali-activated binders). The research aim was to determine the influence of the chemical composition of mineral wool production wastes (MWPW) on the phase composition, structure, and physico-mechanical properties of geopolymers. Five types of MWPW with various chemical compositions and specific surfaces were hydrated in the presence of NaOH (from 2 to 4 wt. %). The experimental results were obtained using the methods of X ray differential (XRD), differential thermal (DTA) and thermogravimetric (DTG) analyses. Moreover, scanning electron microscopy (SEM) and physical and mechanical tests were used. The main hydration product of MWPW in the NaOH presence is determined to be calcium hydrosilicates of the C–A–S–H fiber texture type. The largest amount of C–A–S–H was detected in geopolymer samples made of wastes with an acidity modulus between 1.4 and 1.6. The compressive strength of the obtained materials reaches 80 MPa. They are also characterized by high water resistance. The Al2O3 content in the waste should be about 10 % in order to obtain geopolymers with stable properties. The obtained results made it possible to define the correlation between the structure, composition, and physic-mechanical properties of geopolymers made of MWPW. The practical effect of the research results lies in the possibility of obtaining higher strength classes concrete.

При производстве минеральной ваты образуются отходы в количестве до 30 % от массы готовой продукции. Данные отходы можно использовать при изготовлении строительных материалов, в частности в качестве сырья для получения геополимеров (шлакощелочных вяжущих). Цель исследования состояла в установлении влияния химического состава отходов производства минеральной ваты (ОПМВ) на фазовый состав, структуру и физико-механические свойства геополимеров. Пять видов ОПМВ с различным химическим составом и удельной поверхностью гидратировали в присутствии NaOH (от 2 до 4 мас. %). Экспериментальные результаты получены с применением методов рентгенофазового (РФА), дифференциально-термического (ДТА) и дифференциально-термогравиметрического (ДТГ) анализа, сканирующей электронной микроскопии (СЭМ), физико-механических испытаний. Установлено, что основным продуктом гидратации ОПМВ в присутствии NaOH являются гидросиликаты кальция типа C–A–S–H волокнистой структуры. Наибольшее количество C–A–S–H зафиксировано в образцах геополимеров из отходов с модулем кислотности от 1,4 до 1,6. Прочность при сжатии полученных материалов достигает 80 МПа. Они также характеризуются высокой водостойкостью. Для получения геополимеров со стабильными свойствами содержание Al2O3 в отходе должно быть около 10 %. Выявленные результаты позволили установить взаимосвязь между структурой, составом и физико-механическими свойствами геополимеров из ОПМВ. Практическая значимость результатов исследования заключается в возможности получения бетонов более высоких классов по прочности.

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Keywords

Building construction, микроструктура, microstructure, минеральная вата, рентгенофазовый анализ, X ray diffraction analysis, mechanical properties, Engineering (General). Civil engineering (General), mineral wool, механические свойства, x ray diffraction analysis, geopolymers, thermoanalysis, геополимеры, отходы, TA1-2040, термический анализ, TH1-9745, slags

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
8
Top 10%
Top 10%
Top 10%