The Role of Glass Compounds in Autoclaved Bricks

Anna Stepien*, Beata Potrzeszcz-Sut, Dale Prentice, Tandre Oey, Magdalena Balonis

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

This study describes the relationship between the physio-mechanical and chemical properties of sand-lime materials which have undergone hydrothermal treatment, and which were modified through the introduction of glass components (90% glass sand, GS). Process parameters such as temperature, pressure and saturation vapor pressure were found to have a significant impact on the series of chemical reactions as well as on the formation and transformation of solid hydrates. During the stirring process of sand-lime mass, the temperature of the reaction between lime and water in the presence of quartz sand (QS) was determined to be 83 °C. In the presence of glass sand, measured temperature was only 42 °C. Thermodynamic equilibrium-based modelling was applied to predict stable phase assemblages in the studied systems. It was found that compositional modification along with the application of the autoclaving process resulted in the formation of two crystalline phases: natrolite and gyrolite. Compressive strength and density were also assessed. The strength of fresh laboratory samples was found to be greater than their traditional analogues by 15 MPa. In addition to experimental characterization, sand-lime materials were also modeled using neural networks (backpropagation neural network, BPNN) which serve as a universal approximation method capable of modelling complex functions.
Original languageEnglish
Article number41
JournalBuildings
Volume10
Issue number3
DOIs
Publication statusPublished - 29 Feb 2020
MoE publication typeA1 Journal article-refereed

Funding

This research was funded by NATIONAL SCIENCE CENTER Krakow, Poland, under the Miniature 2 Grant No.: 2018/02/X/ST8/00544, ID: 409666, Title: “Chemical and microscopic analysis of calcium hydrated silicates in the CaO-SiO2-H2O system in autoclaved materials with low content of lime (less than 10%) and high content of glass components with amorphous structure”. Place of international internship and research: University of California Los Angeles, Henry Samueli School of Engineering (USA).

Keywords

  • sand
  • glass
  • calcium
  • autoclaving
  • thermodynamics
  • C-S-H
  • gyrolite
  • natrolite
  • M-S-H

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