Time Evolution of the Modulus of Elasticity of Metakaolin-Based Geopolymer
Source abstract
Abstract
The objective of the research is to develop a new family of geopolymeric materials and to use an experimental methodology to characterize the mechanical behavior of the materials obtained by alkaline activation of metakaolin using a compound activator. The researchers also intend to study the unknown time evolution of the modulus of elasticity and the influence of the composition of the aggregates on the strength of the material. Like the material’s strength, the results have a direct influence on structural safety evaluations. For the analysis of the mechanical properties of the mixtures, different types of tests were carried out: Flexural and compression tests on parallelepipeds and compression tests on cylinders were performed to assess the main strength characteristics of metakaolin-based geopolymers. Regarding the aggregate composition, the results show that the correction of the aggregate particle size line did not improve the mechanical properties. From about 400 h of curing, at ambient temperatures, the mechanical properties of the geopolymeric material are almost invariable. The highest value of the elastic modulus of elasticity occurs around 420 h, at about 18 GPa. The modulus of elasticity is independent of test load rate as per standards, and 1.7‰ strain was observed during maximum compressive stresses in the rupture tests. Also, the secant modulus values at 60% and 80% of maximum stress are within 12% of the value at 40% of maximum stress.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · Innovative concrete reinforcement materials · Microbial Applications in Construction Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
INESC Coimbra, Department of Civil Engineering, University of Coimbra, 3030-788 Coimbra, Portugal
Centre for Mechanical Engineering, Materials and Processes, Department of Civil Engineering, University of Coimbra, 3030-788 Coimbra, Portugal
DCSAT Department of Health Sciences, Environment and Technologies, University of Santiago, Praia, Cape Verde
Funding
FEDER funds through the program COMPETE—Programa Operacional Factores de Competitividade— · national funds through FCT—Fundação para a Ciência e a Tecnologia—
References (33)
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