Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Microstructural changes in alkali-activated slag mortars induced by accelerated carbonation
AbstractThis study investigated microstructural changes in alkali-activated slag (AAS) mortars after carbonation using XRD, FTIR, DTG, 1H NMR and SEM examinations. The results showed that decalcification of C-S-H was the main reaction in carbonation of AAS. The C-S-H with a low Ca/Si was more vulnerable to decalcification in AAS samples activated by waterglass. Besides, AAS mortars demonstrated a lower CaCO3 formation compared to Portland cement mortars. Calcite and vaterite were the major CaCO3 polymorphs produced by carbonation of AAS precipitated mainly in gel pores and spaces in C-S-H interlayers. Meanwhile, the carbonation also caused a certain volume of contraction in AAS mortars.
HighlightsCarbonation affected Portland cement and alkali-activated slag differently.Carbonation decreased the compressive strength of alkali-activated slag mortar.C-S-H was the main calcium source during carbonation of alkali-activated slag.Calcite and vaterite were the major carbonation products of alkali-activated slag.
Microstructural changes in alkali-activated slag mortars induced by accelerated carbonation
AbstractThis study investigated microstructural changes in alkali-activated slag (AAS) mortars after carbonation using XRD, FTIR, DTG, 1H NMR and SEM examinations. The results showed that decalcification of C-S-H was the main reaction in carbonation of AAS. The C-S-H with a low Ca/Si was more vulnerable to decalcification in AAS samples activated by waterglass. Besides, AAS mortars demonstrated a lower CaCO3 formation compared to Portland cement mortars. Calcite and vaterite were the major CaCO3 polymorphs produced by carbonation of AAS precipitated mainly in gel pores and spaces in C-S-H interlayers. Meanwhile, the carbonation also caused a certain volume of contraction in AAS mortars.
HighlightsCarbonation affected Portland cement and alkali-activated slag differently.Carbonation decreased the compressive strength of alkali-activated slag mortar.C-S-H was the main calcium source during carbonation of alkali-activated slag.Calcite and vaterite were the major carbonation products of alkali-activated slag.
Microstructural changes in alkali-activated slag mortars induced by accelerated carbonation
Li, Ning (Autor:in) / Farzadnia, Nima (Autor:in) / Shi, Caijun (Autor:in)
Cement and Concrete Research ; 100 ; 214-226
25.07.2017
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Microstructural changes in alkali-activated slag mortars induced by accelerated carbonation
| British Library Online Contents | 2017
Microstructural changes in alkali-activated slag mortars induced by accelerated carbonation
| British Library Online Contents | 2017
Microstructural changes in alkali-activated slag mortars induced by accelerated carbonation
| British Library Online Contents | 2017
Microstructural changes in alkali-activated slag mortars induced by accelerated carbonation
| Online Contents | 2017
Carbonation process of alkali-activated slag mortars
| British Library Online Contents | 2006