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Carbonated wollastonite – An effective supplementary cementitious material?
Author(s) -
Leemann Andreas,
Winnefeld Frank,
Münch Beat,
Läng Florian
Publication year - 2022
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/jmi.13067
Subject(s) - wollastonite , cementitious , carbonation , mortar , compressive strength , materials science , calcium silicate hydrate , clinker (cement) , cement , calcium silicate , microstructure , portland cement , composite material , slurry , portlandite , mineralogy , chemistry , raw material , organic chemistry
Carbonated wollastonite clinker (CS) may be suitable as supplementary cementitious material (SCM) for mortar and concrete. The microstructure of unground CS clinker, carbonated CS slurry and a mortar blended with carbonated CS are investigated by scanning electron microscopy. Additionally, a reference mortar with pure Portland cement and one with a cement replacement level of 30 mass‐% by carbonated CS are produced to assess its contribution to compressive strength development. The calcium silicates are decalcified during carbonation resulting in CaCO 3 and amorphous SiO 2 . The latter reacts when used as SCM in mortar influencing the Ca/Si ratio of calcium‐silicate‐hydrate and contributing to compressive strength development.