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Early-age properties of alkali-activated slag and glass wool paste
Highlights Waste glass wool is utilized by means of alkali-activation. Early-age properties such as the workability, reaction rate, strength and shrinkage of alkali-activated slag and glass wool pastes are comprehensively studied. Glass wool is found to prolong the setting time and reduce the shrinkage of alkali-activated slag.
Abstract 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.
Early-age properties of alkali-activated slag and glass wool paste
Highlights Waste glass wool is utilized by means of alkali-activation. Early-age properties such as the workability, reaction rate, strength and shrinkage of alkali-activated slag and glass wool pastes are comprehensively studied. Glass wool is found to prolong the setting time and reduce the shrinkage of alkali-activated slag.
Abstract 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.
Early-age properties of alkali-activated slag and glass wool paste
Li, Zhenming (author) / Alfredo Flores Beltran, Irving (author) / Chen, Yun (author) / Šavija, Branko (author) / Ye, Guang (author)
2021-04-12
Article (Journal)
Electronic Resource
English
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