Figure 2 Relationship between (%) strength retained and sulphate attack rating for Portland and blastfurnace slag cement concretes (100mm cubes) after storage in sodium (I) and magnesium (E) sulphate solutions for 5 years

1990 ◽  
pp. 93-95
Keyword(s):  
Sulphate Attack ◽  
Slag Cement ◽  
Blastfurnace Slag

Preparation of electrolytic manganese residue–ground granulated blastfurnace slag cement

2013 ◽  
Vol 241 ◽  
pp. 12-18 ◽  
Author(s):  
Jia Wang ◽  
Bing Peng ◽  
Liyuan Chai ◽  
Qiang Zhang ◽  
Qin Liu
Keyword(s):  
Slag Cement ◽  
Electrolytic Manganese ◽  
Electrolytic Manganese Residue ◽  
Blastfurnace Slag

Microstructure and Microchemistry of Slag Cement Pastes

1986 ◽  
Vol 85 ◽  
Author(s):  
A. M. Harrisson ◽  
N. B. Winter ◽  
H. F. W. Taylor
Keyword(s):  
Portland Cement ◽  
Bound Water ◽  
Compositional Variation ◽  
Slag Cement ◽  
Cement Pastes ◽  
Blastfurnace Slag ◽  
The Individual ◽  
Bound Water Content ◽  
Water Contents

ABSTRACTPastes of a portland cement (60%) blended with a granulated blastfurnace slag (40%) were examined, principally by SEM with EDX analysis. Reaction rims around slag particles and relicts of fully reacted slag particles had compositions compatible with mixtures, in varying proportions, of C-S-H having Si/Ca -0.62 and a phase of the hydrotalcite family having Al/Mg -0.38. Calculations taking into account relevant densities and water contents indicated that replacement of the slag by its in situ hydration products entails little or no change in the numbers of Mg and 0 atoms per unit volume, but that substantial proportions of the Ca, Si and Al are released and an equivalent amount of H gained. In other respects, the microstructures qualitatively resembled those of pure portland cement pastes of similar ages, but less CH was formed and the C-S-H not formed in situ from the slag had a Si/Ca ratio of 0.56, higher than that of 0.50 to 0.53 found in the absence of slag. None of the individual phases in the slag cement pastes showed significant compositional variation with time in the 28 day to 14 month period studied. The relative amounts of Ca, Si and Al expelled from the slag are such that, in order to form C-S-H and AFm phase, more Ca is required. It is obtained partly at the expense of CH formation, and partly through increase in the Si/Ca ratio of the C-S-H formed from the clinker phases. Mass balance, volume composition and bound water content were calculated for the 14 month old paste and compared with corresponding results for the pure portland cement.

Microstructure and Microchemistry of Slag Cement Pastes

1986 ◽  
Vol 86 ◽  
Author(s):  
A. M. Harrisson ◽  
N. B. Winter ◽  
H. F. W. Taylor
Keyword(s):  
Portland Cement ◽  
Bound Water ◽  
Compositional Variation ◽  
Slag Cement ◽  
Cement Pastes ◽  
Blastfurnace Slag ◽  
The Individual ◽  
Bound Water Content ◽  
Water Contents

ABSTRACTPastes of a portland cement (60%) blended with a granulated blastfurnace slag (40%) were examined, principally by SEM with EDX analysis. Reaction rims around slag particles and relicts of fully reacted slag particles had compositions compatible with mixtures, in varying proportions, of C-S-H having Si/Ca -0.62 and a phase of the hydrotalcite family having Al/Mg -0.38. Calculations taking into account relevant densities and water contents. indicated that replacement of the slag by its in situ hydration products entails little or no change in the numbers of Mg and O atoms per unit volume, but that substantial proportions of the Ca, Si and Al are released and an equivalent amount of H gained. In other respects, the microstructures qualitatively resembled those of pure portland cement pastes of similar ages, but less CH was formed and the C-S-H not formed in situ from the slag had a Si/Ca ratio of 0.56, higher than that of 0.50 to 0.53 found in the absence of slag. None of the individual phases in the slag cement pastes showed significant compositional variation with time in the 28 day to 14 month period studied. The relative amounts of Ca, Si and Al expelled from the slag are such that, in order to form C-S-H and AFm phase, more Ca is required. It is obtained partly at the expense of CH formation, and partly through increase in the Si/Ca ratio of the C-S-H formed from the clinker phases. Mass balance, volume composition and bound water content were calculated for the 14 month old paste and compared with corresponding results for the pure portland cement.

Bio-Corrosion Resistance of Concretes Containing Antimicrobial Ground Granulated Blastfurnace Slag BIOLANOVA and Novel Hybrid H-CEMENT

2015 ◽  
Vol 244 ◽  
pp. 57-64 ◽  
Author(s):  
Július Strigáč ◽  
Pavel Martauz ◽  
Adriana Eštoková ◽  
Nadežda Števulová ◽  
Alena Luptáková
Keyword(s):  
Corrosion Resistance ◽  
Sulphuric Acid ◽  
Metabolic Activity ◽  
The Other ◽  
Acidithiobacillus Thiooxidans ◽  
Sulphate Attack ◽  
Ph Changes ◽  
Laboratory Conditions ◽  
Blastfurnace Slag ◽  
Composite Samples

The article deals with the study of biocorrosion of concretes by sulphuric acid induced by oxidizing bacteria Acidithiobacillus thiooxidans. The concretes were prepared from reference cement CEM I 42,5 N, the mixtures of CEM I 42,5 N and antimicrobial ground granulated blastfurnace slag BIOLANOVA (GGBS) (with amount of GGBS 65 mass % - CEM III/A 32,5 N, 75 mass % - CEM III/B 32,5 N, 85 mass % - CEM III/C 32,5 N a 95 mass % - CEM III/C 32,5 N) and novel hybrid cement H-CEMENT (HC). The experiments were carried out in model laboratory conditions at 30 °C during 91 days. The degree of deterioration of concrete samples has been studied on the base of the pH changes of leachate, the concentrations of selected ions such as S, Ca and Si and the mass changes. It has been clearly confirmed, that in the presence of bacteria, the pronounced degradation of the samples occurred with exception of HC sample, which behaviour proved differences to the other samples. The HC concrete possessed more alkali leachate in comparison with the others. The concentration of sulphur S in leachate was increased by metabolic activity of bacteria due to biogenic H2SO4 formation. The increase of S concentration acidified leachate and so promoted leaching next substances from the samples. The concentration of silicon Si in leachate was promoted by metabolic activity of bacteria, as well. The development of Ca leaching concentration has been similar at all composite samples as in the case of reference CEM I 42,5 N concrete, however the smallest portion of leached Ca has been determined at HC concrete. The Ca leaching concentration has been increasing with the amount of GGBS being added to the composite CEM III concretes. The different tendency has been also observed at the HC samples in regards to the mass changes. The increase in mass has been measured at all concrete samples with exception of HC concrete, at which the mass decrease has been found out. The results confirmed the resistance of the concrete composite samples containing GGBS and HC to the sulphate attack and the HC sample showed the highest resistance to the sulphate biocorrosion.

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