Early-age properties of alkali-activated slag and glass wool paste

Early-age properties of alkali-activated slag and glass wool paste

Li, Z. (TU Delft Materials and Environment)
Beltran, Irving Alfredo Flores (TU Delft Materials and Environment)
Chen, Y. (TU Delft Materials and Environment; South China University of Technology)
Šavija, B. (TU Delft Materials and Environment)
Ye, G. (TU Delft Materials and Environment; Universiteit Gent)

2021

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.

Alkali-activated slag
Glass wool
Mechanical properties
Shrinkage
Waste
Workability

http://resolver.tudelft.nl/uuid:97fd663f-f8c3-4c53-adbf-22d3d2ea5126

https://doi.org/10.1016/j.conbuildmat.2021.123326

0950-0618

Construction and Building Materials, 291, 1-13

Institutional Repository

journal article

© 2021 Z. Li, Irving Alfredo Flores Beltran, Y. Chen, B. Šavija, G. Ye