Testing Silica Fume-Based Concrete Composites under Chemical and Microbiological Sulfate Attacks

Estokova, Adriana; Kovalcikova, Martina; Luptáková, Alena; Prascakova, Maria

doi:10.3390/ma9050324

Cited by 21 publications

(19 citation statements)

References 29 publications

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“…Sulfate resisting cement is a special type of cement, primarily used in cases with high sulfate corrosion resistance demands; an improved resistance of the concrete samples to sulfate attack is expected, compared to Portland-based cements. This is in accordance with other authors, e.g., Hossack [28] and Eštokova [29], who confirm the improved resistance of the concrete samples with the sulfate resisting cement and silica fume to sulfate attack. The finding proved that the performance of sulfate resisting cement-based concrete to sulfate attack was different from that for simple leaching corrosion caused by water.…”

Section: Correlation Between Sulfate and Leaching Corrosionsupporting

confidence: 93%

Correlation Analysis between Different Types of Corrosion of Concrete Containing Sulfate Resisting Cement

2017

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Utilization of pozzolanic materials (fly ash, slag, zeolite, metakaolin, microsilica and more) in the manufacturing of cement and concrete has increased considerably over the last decades. Another option is to use concrete containing sulfate resisting cement. This could help minimize the harmful impacts on concrete exposed to an aggressive environment. The issue of the deteriorative impact of the three types of concrete corrosion (acidic, sulfate and leaching) investigated using correlation analysis is presented in the paper. Concentrations of silicon and calcium leached out from the concrete samples into the liquid phase and the measured pH values were used as input data for a mathematical approach to the study of sulfate resisting cement. The performance of sulfate resisting cement-based concrete was improved when exposed to sulfate attack, but not in the case of leaching corrosion caused by water.

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Section: Correlation Between Sulfate and Leaching Corrosionsupporting

confidence: 93%

Correlation Analysis between Different Types of Corrosion of Concrete Containing Sulfate Resisting Cement

2017

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“…One of the most used active additions is silica fume [7][8][9][10]. On one hand, it has been established by various authors that silica fume addition results in an improvement in durability-related characteristics such as permeability [11][12][13], electrical resistivity [14,15] and chloride diffusivity [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Short-Term Performance of Sustainable Silica Fume Mortars Exposed to Sulfate Attack

Ortega

Esteban

Williams³

et al. 2018

Sustainability

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Nowadays, the reuse of wastes is essential in order to reach a more sustainable environment. The cement production results in CO2 emissions which significantly contribute to anthropogenic greenhouse gas emissions. One way to reduce them is by partially replacing clinker by additions, such as silica fumes or other wastes. On the other hand, the pore structure of cementitious materials has a direct influence on their service properties. One of the most popular techniques for characterizing the microstructure of those materials is mercury intrusion porosimetry. In this work, this technique has been used for studying the evolution of the pore network of mortars with different percentages of silica fume (until 10%), which were exposed to aggressive sodium and magnesium sulfate solutions up to 90 days. Between the results of this technique, intrusion-extrusion curves and logarithms of differential intrusion volume versus pore size curves were studied. This characterization of the pore network of mortars has been complemented with the study of their compressive strength and their steady-state ionic diffusion coefficient obtained from samples’ resistivity. Generally, silica fume mortars showed different performance depending on the aggressive condition, although the greatest deleterious effects were observed in the medium with presence of both magnesium and sodium sulfates.

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“…The most significant changes can be observed on surface of the sample S4, which was made of 95 wt.% of blast furnace slag. More visible corrosive surface defects on the samples due to sulphate environment would be observed after longer period of bacterial exposure (Eštoková et al 2016).…”

Section: Surface Changesmentioning

confidence: 97%

“…calcium compounds starts immediately when the samples are placed in aggressive environment or even water solution and finally, after certain time, depending on the aggressivity of medium, it can cause a loss of properties of composites. Eštoková et al (2016) reported that bacterial exposure can be Based on the measured concentrations of elements in leachates, it is difficult to evalaute the leachability of the samples. To compare the durability of the individual cement mortars in terms of main elements leaching, the percentage of leached-out masses of particular elements is in progress.…”

Section: Leaching Of Basic Elementsmentioning

confidence: 99%

Development of Compressive Strength of Slag Based Cement Mortars Exposed to an Aggressive Sulphate Environment

Estokova

Smolakova

Luptáková

2017

Proccedings of 10th International Conference "Environmental Engineering"

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Abstract. Sulfuric acid corrosion can cause severe damage to concrete and cement composites. There are a variety of approaches to enhancing the sustainability of concrete and mortar one of which is to enhance the durability of concrete using different cement replacement. Granulated blast furnace slag is used in mortar and concrete, as a partial replacement of Portland cement, and this use has resulted in significant savings in the cost of production of concrete. Moreover the use of conventional concrete is notoriously subject to durability and corrosion issues. Laboratory experiments were conducted to investigate the compressive strength of cement mortars samples with cement partially replaced by blast furnace slag. The samples with different share of slag (65, 75, 85 and 95 wt.%) were exposed to a bacterial sulphate environment for 90 days. A decrease in compressive strengths of reference samples by 8% as well as an increase in compressive strengths of all slag-based sampless up to 95 % have been observed. Surface structure and chemical compositions of cement mortars´ leachates confirmed a deterioration process under the microbial exposure of Acidithiobacillus thiooxidans.

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Testing Silica Fume-Based Concrete Composites under Chemical and Microbiological Sulfate Attacks

Cited by 21 publications

References 29 publications

Correlation Analysis between Different Types of Corrosion of Concrete Containing Sulfate Resisting Cement

Correlation Analysis between Different Types of Corrosion of Concrete Containing Sulfate Resisting Cement

Short-Term Performance of Sustainable Silica Fume Mortars Exposed to Sulfate Attack

Development of Compressive Strength of Slag Based Cement Mortars Exposed to an Aggressive Sulphate Environment

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