Accelerated test of mortars

Authors

  • Cleberson S. Adorno Universidade Federal do Paraná-UFP, Paraná https://orcid.org/
  • Eloise A. Langaro Universidade Federal do Paraná
  • Marcelo H. F. Medeiros Universidade Federal do Paraná
  • Andressa Gobbi Universidade Estadual de Ponta Grossa

DOI:

https://doi.org/10.47842/juts.v3i1.23

Keywords:

AMBT, Rice husk ash, Expansion, Porosimetry

Abstract

The accelerated test of mortar bars (AMBT) is the fastest to detect the reactivity of aggregates. However, it presents several limitations regarding the classification, limits and the conditions to accelerate the test. When AMBT is used to classify mineral additions that potentially inhibit RAS, NaOH solution and high temperature are crucial factors. The present work aims to investigate the effect of AMBT on the development of RAS in combinations of cement with rice husk ash and sílica fume. The induced expansion was used to assess the kinetics of RAS. In addition, the chemical and physical properties of the hydrated matrix under normal conditions of temperature and humidity and under test conditions were characterized by XRD, TGA and MIP. The fineness and particle size of rice husk ash were determinant in the mitigation of RAS. AMBT conditions are too aggressive to discard a material just by the determination of expansion. The mechanisms of action of mineral additions subjected to RAS must be better understood and evaluated by using tests that do not compromisse their development.

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References

ABBAS, S.; KAZMI, S. M. S.; MUNIR, M. J. Potential of rice husk ash for mitigating the alkali-silica reaction in mortar bars incorporating reactive aggregates. Construction and Building Materials, v. 132, p.61–70, 2017.

Published

2020-12-01

How to Cite

ADORNO, C. S. .; LANGARO, E. A. .; MEDEIROS, M. H. F. .; GOBBI, A. . Accelerated test of mortars. Journal of Urban Technology and Sustainability, [S. l.], v. 3, n. 1, p. 36–50, 2020. DOI: 10.47842/juts.v3i1.23. Disponível em: https://journaluts.emnuvens.com.br/journaluts/article/view/23. Acesso em: 22 may. 2025.