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Buildings 2018, 8(1), 9; https://doi.org/10.3390/buildings8010009

Calcium Extraction from Blast-Furnace-Slag-Based Mortars in Sulphate Bacterial Medium

1
Institute of Environmental Engineering, Faculty of Civil Engineering, Technical University of Kosice, 042 00 Kosice, Slovakia
2
Institute of Geotechnics, Slovak Academy of Science, 040 01 Kosice, Slovakia
*
Author to whom correspondence should be addressed.
Received: 23 November 2017 / Revised: 4 January 2018 / Accepted: 8 January 2018 / Published: 10 January 2018
(This article belongs to the Special Issue Sustainable Building Materials)
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Abstract

Wastewater structures, such as treatment plants or sewers can be easily affected by bio-corrosion influenced by microorganisms living in waste water. The activity of these microbes results in deterioration and can cause the reduction in structural performance of such structures. In order to improve the durability of mortar and concrete, different admixtures are being used and the best impact is observed in cement based materials combined with blast furnace slag. In this study, mortar samples with blast furnace slag were exposed to bacterial sulphate attack for 90 and 180 days. The leaching of calcium ions from the cement matrix and equivalent damaged depths of studied mortar samples were evaluated. The results showed more significant leaching of samples placed in bacterial environment, compared to the samples placed in non-bacterial environment. Similarly, the equivalent damaged depths of mortars were much higher for the bacteria-influenced samples. The slag-based cement mortars did not clearly show improved resistance in bacterial medium in terms of calcium leaching. View Full-Text
Keywords: calcium leaching; bio-deterioration; microbiological corrosion; cement mortars; blast furnace slag calcium leaching; bio-deterioration; microbiological corrosion; cement mortars; blast furnace slag
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Estokova, A.; Smolakova, M.; Luptakova, A. Calcium Extraction from Blast-Furnace-Slag-Based Mortars in Sulphate Bacterial Medium. Buildings 2018, 8, 9.

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