The impact of sulphate and magnesium on chloride binding in Portland cement paste

Weerdt, Klaartje De; Orsáková, Denisa; Geiker, Mette Rica

doi:10.1016/j.cemconres.2014.07.007

Cited by 184 publications

(68 citation statements)

References 20 publications

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“…The chlorine content reaches a maximum when the sulphur content starts to decline. This is in line with that the presence of sulphates causes a reduction in chloride binding [26][27][28].…”

Section: Effect Of Elemental Changes On Chloride Profilesupporting

confidence: 64%

“…leaching) which increase locally the chloride binding capacity of the cement paste. The hypothesis put forward is that continuous leaching over time leads to a reduction in the pH in the outer section of the concrete and -until a certain limit -thereby an increased maximum total chloride concentration as a slight reduction in pH has been observed to lead to an increase in the chloride binding capacity [27][28][29].…”

Section: Effect Of Elemental Changes On Chloride Profilementioning

confidence: 99%

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Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content

Weerdt

Orsáková

Müller

et al. 2016

Construction and Building Materials

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“…The chlorine content reaches a maximum when the sulphur content starts to decline. This is in line with that the presence of sulphates causes a reduction in chloride binding [26][27][28].…”

Section: Effect Of Elemental Changes On Chloride Profilesupporting

confidence: 64%

Section: Effect Of Elemental Changes On Chloride Profilementioning

confidence: 99%

Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content

Weerdt

Orsáková

Müller

et al. 2016

Construction and Building Materials

Self Cite

View full text Add to dashboard Cite

“…However, also plaster VOM accumulated high amount of chlorides that was around 19.5 mg/g. Similar binding capacity obtained, e.g., de Weerdt et al [16] who analysed the impact of sulpate and magnesium on chloride binding in Portland cement paste. The authors referred on binding capacity of chlorides ranging from around 5 mg/g to 21 mg/g in dependence on the concentration of chloride solution.…”

Section: Resultssupporting

confidence: 68%

Water Vapour Storage Capacity of Masonry Renovation Plasters Contaminated with Chlorides

Pavlíková¹,

Pavlík²,

Matiašovský³

2018

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The effect of sodium chloride presence on the water vapour storage capacity was studied for six types of plasters designed for application in masonry restoration. Sorption isotherms were measured using a static climate chamber method. The researched materials were characterised by their bulk density, matrix density, and total open porosity. For the studied materials, measurement of chloride binding isotherms by an adsorption method was done in order to reveal their capacity to accumulate salts and relate the adsorbed water vapour to the amount of contained salt. The experimental sorption data measured for salt contaminated samples were analysed using relation expressing the dependence of the mass equilibrium moisture content (EMC) of plasters saturated with salt solution of given molality on relative humidity of the environment. For relative humidity up to 70 %, good agreement between measured and calculated data was obtained. For higher relative humidity, the water vapour adsorption capacity of studied materials was not fully exploited especially for lower chloride concentrations. The type of binder together with physical parameters of examined materials was found to have a decisive role in chloride binding. One of the tested materials can be possibly classified as WTA renovation plaster, considering its total open porosity, bulk density and high binding capacity for chlorides. On the other hand, one must take into account its hygroscopicity, especially in case of a higher salt contamination.

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“…On the other hand, the DTG curves in Figure 4c,d indicate that ettringite production was significantly lower when RO reject water was used rather than other types of mixing water. Given that the presence of Mg 2+ has an inhibitory effect on the formation of ettringite [49][50][51], the reduced amount of ettringite may be partially due to the greatest concentration of Mg 2+ in the RO reject water. However, the dashed boxes in the TG curves in Figure 4 clarify that the weight loss of ettringite was not notably affected by changing mixing water; for instance, in Figure 4d, the difference in weight loss between CG and ROG up to~120 • C was merely 0.6 wt%, and this mass difference corresponds to only 1.2 wt% of ettringite formation.…”

Section: Thermogravimetric (Tg) Analysismentioning

confidence: 99%

Recycling of Reverse Osmosis (RO) Reject Water as a Mixing Water of Calcium Sulfoaluminate (CSA) Cement for Brick Production

et al. 2019

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This study explored the possibility of using reverse osmosis (RO) reject water as a mixing water for producing cementitious bricks using calcium sulfoaluminate (CSA) cement along with gypsum, and it investigated the changes in the properties of CSA cement pastes when RO reject water was used. The results were compared with those obtained using purified water and seawater. Overall, the use of RO reject water improved the cement paste’s strength. Given that the use of RO reject water very slightly affected ettringite formation but more significantly influenced the Al2O3-Fe2O3-mono (AFm) phases (i.e., monosulfate, kuzelite, and Friedel’s salt) and amorphous aluminum hydroxide (AH3), the strength improvement was likely mainly due to the formation of Friedel’s salt rather than ettringite formation. This study also demonstrated that the use of RO reject water for brick production satisfied the Korean Standards (KS) F 4004 and toxicity characteristic leaching procedure (TCLP); thus, it is recommended to use RO reject water as a mixing water to produce CSA cement bricks for use in construction.

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The impact of sulphate and magnesium on chloride binding in Portland cement paste

Cited by 184 publications

References 20 publications

Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content

Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content

Water Vapour Storage Capacity of Masonry Renovation Plasters Contaminated with Chlorides

Recycling of Reverse Osmosis (RO) Reject Water as a Mixing Water of Calcium Sulfoaluminate (CSA) Cement for Brick Production

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