Refine
Year of publication
Document Type
Language
- English (29)
- German (17)
- Chinesisch (2)
Keywords
- alkali silica reaction (3)
- CO2-reduction (2)
- Fly ash (2)
- Resource conservation (2)
- Waste materials (2)
- aggregate reactivity (2)
- dissolution of silica and alumina (2)
- dissolution rate (2)
- open porosity (2)
- 4 phases model (1)
- ASR; quartzite; Raman microscopy; surface analysis (1)
- Activity index (1)
- Alkali-silica reaction (1)
- Alumina containing SCMs (1)
- BTU-SP test (1)
- Blended cement (1)
- Brick clay (1)
- Calcined clay (1)
- Calcined clay mixtures, Supplementary cementing material, worka-bility, superplastizers mixtures, precast concrete elements (1)
- Carbonation (1)
- Chloride penetration (1)
- Clay mixtures Solubility (1)
- Durability (1)
- Dynamic modulus of elasticity (1)
- Enhancing durability (1)
- Illite (1)
- Meta clays (1)
- Pozzolani behavior (1)
- SCMs, Aggregates, ASR inhibition, Dissolution behavior, Alkaline solution (1)
- Self-hardening bricks (1)
- Si/Al ratio (1)
- Solubility (1)
- X-ray photoelectron spectroscopy (1)
- XPS method (1)
- aggregate grains; aluminium concentration; deicing salt; dissolution experiments; silica release (1)
- alkali reactivity (1)
- alkali silica reaction; alkaline solution; alumina & silica dissolution; NaCl; regression analysis (1)
- alkali silica reaction; kinetic modeling; quartzite aggregates; silica dissolution; thermodynamic data (1)
- alkali–silica reaction (1)
- alternative binders (1)
- alumina silicate layer (1)
- alumino silicate formation (1)
- alumino silicate structures (1)
- geopolymere (1)
- industrial residues (1)
- inhibition (1)
- mineral admixture (1)
- modeling (1)
- pore solution (1)
- quartzite rock (1)
- silica release (1)
- solubility (1)
- solubility of SCM (1)
- solubility of aggregate (1)
- solubility of aggregates (1)
- supplementary cementing materials (1)
- supplementary cementing materials (SCM) (1)
- surface coating (1)
- surface layer (1)
- temperature (1)
Institute
- FG Baustoffe und Bauchemie (47)
- FG Hydrologie (1)
It is well known that SCMs containing alumina can prevent the damaging alkali silica reaction in concrete. This paper deals with the direct interactions between aggregate grain surfaces (quartzitic rock material Q1) and the dissolved amounts of SCMs (metakaolin, aluminum hydroxide). Investigations have confirmed that the presence of such SCMs can strongly decrease the silica release from aggregates in comparison to solubility experiments without SCM addition. The reason for this effect is the formation of a thin alumina containing layer (some nanometers thick) on the grain surfaces. The existence of this layer could be determined by XPS. Only this method provides data of the strongly increased alumina concentration in a thin surface area and also of the layer thickness in dependence on reaction parameters. Dissolution experiments of grains coated with such layer demonstrate the effectiveness of this process and can give a further contribution for understanding the preventing mechanisms of SCMs.