| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Kunther, Wolfgang
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (32/32 displayed)
- 2024Understanding the influence of cementitious blended mixtures on pyrrhotite oxidation and internal sulphate attack
- 2024Metals in Mine Tailings and Prospects for Use in Cementitious Materials
- 2024Mapping circular economy practices for steel, cement, glass, brick, insulation, and wood – A review for climate mitigation modelingcitations
- 2024Mapping circular economy practices for steel, cement, glass, brick, insulation, and wood – A review for climate mitigation modelingcitations
- 2024Performance of cementitious systems containing calcined clay in a chloride-rich environment : A review by TC-282 CCLcitations
- 2024Development of a Performance-Based Framework for Optimized Selection of Raw Materials to Mitigate ASR in Concrete
- 2024Advancements in Heavy Metal Stabilization
- 2024Oxidation of sulfides from secondary materials in cementitious binders as a function of environmental conditions
- 2024Electrodialytic extraction of copper, lead and zinc from sulfide mine tailings:Optimization of current density and operation time
- 2023Gypsum formation mechanisms and their contribution to crystallisation pressure in sulfate resistant hardened cement pastes during early external sulfate attack at low sulfate concentrationscitations
- 2023Phase changes in cementitious materials exposed to saline solutionscitations
- 2023Clay Brick Powder as Partial Cement Replacementcitations
- 2023Development of a Framework to Provide Concrete with a Low Carbon Footprint and Enhanced Resistance Against ASR-Induced Development
- 2023Thermodynamics of calcined clays used in cementitious binderscitations
- 2023Cementitious materials for oil-well abandonment and numerical simulations of cement durability at oil well conditions
- 2023Thermodynamics of calcined clays used in cementitious binders:origin to service life considerationscitations
- 2023Binary and Ternary Shale Binders with High Replacement Levels
- 2022Chloride binding in Portland composite cements containing metakaolin and silica fumecitations
- 2022Chloride binding in Portland composite cements containing metakaolin and silica fumecitations
- 2022Chloride binding in Portland composite cements containing metakaolin and silica fumecitations
- 2022Durability performance of binary and ternary blended cementitious systems with calcined claycitations
- 2022Heat of hydration vs. strength development of shale-limestone blended binders
- 2021Exploring sulphate resistance of coal mining waste blended cements through experiments and thermodynamic modellingcitations
- 2021Phase evolution and mechanical performance of an ettringite-based binder during hydrothermal agingcitations
- 2021Screening for key material parameters affecting early-age and mechanical properties of blended cementitious binders with mine tailingscitations
- 2021Impact of electrodialytic remediation of MSWI fly ash on hydration and mechanical properties of blends with Portland cementcitations
- 2019Sulfate resistance of calcined clay – limestone – Portland cementscitations
- 2019Chloride binding in blended binder systems: Importance of the structures of CSH gel
- 2019Chloride binding in blended binder systems: Importance of the structures of CSH gel
- 2017Influence of the Ca/Si ratio on the compressive strength of cementitious calcium-silicate-hydrate binderscitations
- 2015Durability of Portland Cement Blends Including Calcined Clay and Limestone: Interactions with Sulfate, Chloride and Carbonate Ionscitations
- 2013On the relevance of volume increase for the length changes of mortar bars in sulfate solutionscitations
Places of action
| Organizations | Location | People |
|---|
document
Oxidation of sulfides from secondary materials in cementitious binders as a function of environmental conditions
Abstract
The process of mining produces large quantities of waste, which may be utilized as secondary materials in the building sector. Mine tailings have been investigated in the context of construction materials in different forms. One way of using these materials is to reduce the clinker quantity of cement used in concrete or mortars to reduce the “embedded” CO<sub>2 </sub>footprint of infrastructure projects. Corresponding requirements have been implemented for example in the Danish construction regulations, with a planned reduction for allowable CO<sub>2</sub> quantities per m<sup>2</sup> and 50 years of operation.<br/><br/>Utilizing secondary materials can be seen in this context as a step towards the circularity and symbiosis of industrial sectors while also reducing embedded CO<sub>2</sub> in concrete. However, many mining ores contain sulfide minerals, which may have a negative influence on the performance and service life of cementitious materials. Hence, it is crucial to understand the oxidation of sulfides in cementitious binders. <br/><br/>This study looked at two storing conditions of cementitious materials, underwater and in the air at varying relative humidities, with the aim of investigating the oxidation of sulfides in cementitious materials in aqueous environments and during carbonation. <br/><br/>Storing the samples underwater, with partial solution exchange, lead to steady sulfate release during the period of testing. Changing the relative humidity and allowing the carbonation of cement hydrates, which occurred simultaneously with the oxidation of the sulfides led to higher concentration of sulfates in the leachate solution and small increase of ettringite in the cement pastes.