Material characterization of geopolymer mortar for its beneficial use in composite construction

RILEM Technical Letters

article

Joachim Juhart¹  Christopher Gößler²  Cyrill Grengg³  Florian Mittermayr¹  Ognjen Rudic¹  AndrewMcIntosh⁴  Bernhard Freytag² 

[1] Institute of Technology and Testing of Construction Materials, Graz University of Technology;Laboratory for Structural Engineering, Graz University of Technology;Institute of Applied Geosciences, Graz University of Technology;banah UK Ltd

关键词: Geopolymer mortar;    composite construction;    strength development;    autogenous;    early and drying shrinkage;    thermal expansion coefficient;   

DOI  :  10.21809/rilemtechlett.2020.125

学科分类：社会科学、人文和艺术（综合）

来源: RILEM Publications SARL

【 摘 要 】

This paper investigates material properties of metakaolin/slag-based geopolymer mortar (GPM), relevant for composite action with conventional Portland cement-based concrete (PCC). GPM formulations with different workability (soft and stiff-plastic consistencies) were developed and characterized with regard to their compressive and tensile strength development over time, their shrinkage behaviour during hardening under different ambient conditions, as well as their thermal expansion. With the experimental data obtained, a coefficient of thermal expansion and equations for predicting the strength development were calculated. The GPMs exhibited significant autogenous shrinkage and drying shrinkage. Additionally, high very early shrinkage, tested by a new image correlation method, occurred immediately after setting under dry conditions. Thereby, the observed extent of early shrinkage strongly depended on the specimens’ thicknesses. Furthermore, the basic characteristics of autogenous and drying shrinkage of GPM were enlightened and compared to PCC.

【 授权许可】

CC BY