Structural performance of waste-based reinforced alkali-activated concrete

Miraldo, Sérgio; Lopes, Sérgio M.R.; Pacheco-Torgal, F.; Lopes, Adelino V.

doi:10.1016/b978-0-323-85469-6.00029-5

Cited by 1 publication

(1 citation statement)

References 28 publications

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“…Therefore, they have great potential to be a sustainable alternative to Portland cement. Properties such as good adhesion to other materials such as steel, glass, ceramics, fresh concrete and old substrates, high compressive and abrasion resistance, low shrinkage and thermal conductivity, fast and controlled curing, high acid resistance, high pH to protect reinforcement, reduced emission of pollutants, and good fire resistance have shown the good performance of geopolymer materials in construction [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Time Evolution of the Modulus of Elasticity of Metakaolin-Based Geopolymer

Lopes

Fernandes

2023

Applied Sciences

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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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