Corrosion inhibitory effects of mullite in concrete exposed to sulfuric acid attack

Shima Taheri*, Gerardo Pareja Delgado , Oluwatoosin B. A. Agbaje, Paritosh Giri, Simon Martin Clark

*Corresponding author for this work

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Prolonged exposure to low pH conditions affects the durability of concrete. In this work, the effect of mullite, aluminum silicate, on the strength and the acid corrosion of mortar and concrete under induced accelerated conditions in sulfuric acid solutions at pH of 0.25 and 1 was studied. The characterization of physicochemical changes was performed using techniques including compressive strength, scanning electron microscopy, micro-X-ray fluorescence spectrometry, and the Vickers hardness test. The results indicate that the addition of mullite does not have any significant effect on the overall strength of mortar and concrete samples, while it significantly increases their resistance to corrosion caused by sulfate attack by 90%, therefore, it is expected to increase the life span and decrease the maintenance costs of concrete pipes subjected to acid corrosion in sewer environments. The inhibition efficiency is observed to be sensitive to acid concentration and was improved with increase in the amount of mullite in samples.
Original languageEnglish
Pages (from-to)282-295
Number of pages14
JournalCorrosion and Matererial Degradation
Issue number2
Publication statusPublished - Sep 2020

Bibliographical note

Copyright the Author(s) 2020. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


  • corrosion inhibition
  • mullite
  • concrete corrosion
  • durability
  • acid corrosion


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