Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 291, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.123326
Keywords
Glass wool; Waste; Alkali-activated slag; Mechanical properties; Workability; Shrinkage
Categories
Funding
- European Union's Horizon 2020 research and innovation programme [821000]
- H2020 Societal Challenges Programme [821000] Funding Source: H2020 Societal Challenges Programme
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By combining glass wool waste with blast furnace slag through alkali activation, a new material with good mechanical properties and workability can be obtained, without compromising the performance of the blended paste.
In this study, glass wool waste was utilized by means of alkali-activation with blast furnace slag. Reaction kinetics, workability, mechanical properties and autogenous shrinkage of alkali-activated slag and glass wool were comprehensively studied. Results indicated an optimal modulus (SiO2/Na2O) of the activator related to a long enough setting time and a high reaction degree of alkali-activated slag paste. The incorporation of glass wool as partial slag replacement did not necessarily lead to degradation in the performance of the pastes. While the compressive strength was always lower when glass wool was incorporated in the mixture, the flexural strength and workability could be improved with proper glass wool dosages. Autogenous shrinkage of blended pastes was always lower compared to the the mixture without glass wool. The results in this paper suggest that waste glass wool can be used as a precursor in slag-based alkali-activated system, resulting in improvements in the early-age properties of the paste such as a prolonged setting time and reduced shrinkage. (C) 2021 The Author(s). Published by Elsevier Ltd.
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