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

Estokova, Adriana; Smolakova, Michaela; Luptáková, Alena

doi:10.3390/buildings8010009

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…The increase in pH of the media was linked to the cement components leaching, mainly of portlandite (Ca(OH) 2 ), which contributed to the higher concentrations of hydroxide ions (Beddoe et al 2022). This finding is in correlation with the other authors and our previous research as well (Zhou et al 2018, Estokova et al 2018, Rozière et al 2009. During whole experimental period, the pH fluctuated in the interval of 11-12, in spite of the fact that the pH was regularly set to the initial value.…”

Section: Ph Of Aggressive Mediasupporting

confidence: 93%

Cement Composites With Waste Incorporation Under Acid Rain Attack

2022

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The paper is aimed at the study of the resistance of cement pastes containing various secondary materials (fly ash, zeolite, zeoslag, slag and microsilica) in the model environment of acid rain. Changes in characteristics of the studied materials due to acid rain, such as compressive strength of cement composites, water absorption, penetration of aggressive ions, pH of material and its chemical composition were analysed. Model acidic environments represented solutions simulating acid rain with different pH values (2, 4 and 6). Natural acid rain, deionized water and saturated solution of Ca(OH)2 were used as reference media. Based on the experimental findings, it can be stated that a positive effect of the secondary materials on increasing the resistance of cement pastes has been proven. The cement pastes with added additives resulted in a significant reduction in permeability in each model environment. This fact has an impact on the overall durability due to the fact that the amount of aggressive ions in the internal structure is reduced, causing corrosion and subsequent deterioration of cement composites. Based on the innovative methodology for the ion-penetraton test of cement pastes, a coefficient was designed, which characterizes the effect of the used admixture in terms of pozzolanic resp. latent hydraulic activities. Based on this coefficient, the most significant positive effect was manifested by the use of an admixture of ash and zeolite. The rapid chloride penetration (RCP) test method has thus proved to be much more relevant in comparison with, for example, water absorption.

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Section: Ph Of Aggressive Mediasupporting

confidence: 93%

Cement Composites With Waste Incorporation Under Acid Rain Attack

2022

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“…The dissolved quantities of Fe 3+ ions are low and, for the particular concrete sample, oscillate around the same value, during the entire experimental period. The decrease in concentrations of the ions in leachates during the experiment is likely caused by the recrystallization of the sulfate compounds on the concrete samples, as reported in [22].…”

Section: Chemical Composition Of Leachatesmentioning

confidence: 65%

Influence of Sulfuric Acid Attack on Concrete With Industrial Waste

Estokova

Smolakova

2018

e-GFOS

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“…Spectrometer SPECTRO iQ II (Ametek, Germany) with SDD silicon drift detector with resolution of 145 eV at 10 000 pulses was used. Detailed measurement conditions of the XRF analysis were previously described in [13]. Table 2 shows concrete samples prior and after the exposition to acid rain environment.…”

Section: Leachability Of Ca 2+ and Si 4+ Ionsmentioning

confidence: 99%

Evaluation of concrete deterioration under simulated acid rain environment

Smolakova

Estokova

2019

Selected Scientific Papers - Journal of Civil Engineering

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Acid rain is identified as one of the most serious environmental problems nowadays and it is mainly a mixture of sulfuric and nitric acids. Deterioration of concrete structures exposed to aggressive acid rain attack is a key durability issue that affects the performance and maintenance costs of vital civil infrastructures. The motivation for understanding the acid rain corrosion process is high because of the early age deterioration of many concrete structures exposed to acid rain. The main objective of this study was to investigate the durability of concrete specimens with different supplementary cementitious materials, such as fly ash, zeolite and blast furnace slag against acid rain attack. Experiments of acid rain simulation influence on the composites were carried out for 7 weeks and parameters like visual changes, absorbability and leachability of calcium and silicon ions were evaluated. The increase in absorbability was detected for all samples while the sample with blast furnace slag was identified to be the most durable in this point of view. The most durable sample considering leached-out calcium and silicon ions was found to be sample with fly ash.

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

Cited by 5 publications

References 26 publications

Cement Composites With Waste Incorporation Under Acid Rain Attack

Cement Composites With Waste Incorporation Under Acid Rain Attack

Influence of Sulfuric Acid Attack on Concrete With Industrial Waste

Evaluation of concrete deterioration under simulated acid rain environment

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