Material Characterization of Geopolymer Concrete for Its Beneficial Use in Composite Construction

Joachim Juhart*, Christopher Gößler, Cyrill Grengg, Florian Mittermayr, Andrew McIntosh, Bernhard Freytag

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in Buch/BerichtBegutachtung

Abstract

Geopolymer concrete (GPC) is an inorganic, mineral-based construction material with high resistance to chemical attack and further excellent properties such as rapid strength development and relatively low CO2 emissions in comparison to ordinary Portland cement based normal concrete (PCC). However, production technologies, corresponding to the workability and time-dependent properties during the hardening of GPC are not known in detail. The aim of an ongoing research project is to combine GPC with PCC to form composite structures for applications in chemically aggressive environments such as sewers. This paper deals with material properties of GPC, which have significant impact on the composite action. GPC formulations with different workability (soft and stiff-plastic consistencies) were developed and investigated with regard to their compressive and tensile strength development over time, as well as shrinkage during hardening under different ambient conditions (autogenous shrinkage, drying shrinkage, early shrinkage). The GPCs investigated show significant autogenous shrinkage and drying shrinkage. Under dry conditions, additionally very high early shrinkage occurs immediately after the beginning of hardening, which was tested using the image correlation method. The extent of this early shrinkage depends strongly on the thickness of the specimen. As another result of this experimental study, equations for the prediction of the strength development over time are given in this paper.

Originalspracheenglisch
TitelRILEM Bookseries
Herausgeber (Verlag)Springer Science and Business Media B.V.
Seiten271-283
Seitenumfang13
DOIs
PublikationsstatusVeröffentlicht - 2021

Publikationsreihe

NameRILEM Bookseries
Band33
ISSN (Print)2211-0844
ISSN (elektronisch)2211-0852

ASJC Scopus subject areas

  • Tief- und Ingenieurbau
  • Bauwesen
  • Werkstoffmechanik

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