SYNTHESIS OF RANKINITE FROM NATURAL Ca-Si ROCKS AND ITS HARDENING IN CO2 ATMOSPHERE

Rankinite binder material was synthesised from the mixture (C/S = 1.5) of locally (Lithuania) available materials - opoka and limestone - at 1250 °C for 45 min. Its suitability as a non-hydraulic binder for carbonation curing has been assessed. Mortar samples prepared of binder and sand mixture (15:...

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Bibliographic Details
Published inRevista Romana de Materiale Vol. 49; no. 1; pp. 111 - 119
Main Authors Smigelskyte, Agne, Siauciunas, Raimundas, Wagner, Matthias, Urbonas, Liudvikas
Format Journal Article
LanguageEnglish
Published Bucharest Foundation for Materials Science and Engineering - "Serban Solacolu" 01.01.2019
Subjects
Carbon dioxide
Carbonation
Cement
Compressive strength
Concrete
Construction materials
Curing
Emission standards
Emissions
Energy consumption
Fourier transforms
Greenhouse gases
Hardening
Hydraulics
Limestone
Mechanical properties
Mortars (material)
Raw materials
Scanning electron microscopy
Silica
Temperature
China
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Summary:Rankinite binder material was synthesised from the mixture (C/S = 1.5) of locally (Lithuania) available materials - opoka and limestone - at 1250 °C for 45 min. Its suitability as a non-hydraulic binder for carbonation curing has been assessed. Mortar samples prepared of binder and sand mixture (15:85 wt%, w/c = 0.35) were pressed and cured in a pressure reactor using gaseous (5 and 50 bar at 20 and 50 °C) and supercritical CO2 (150 bar at 50 °C) for 4 and 24 h. It was determined that with increasing pressure, exposure time and/or temperature the carbonation process is intensified, sample compressive strength is highly increased. Hardening samples at the highest conditions led to full carbonation and the highest strength. For the first time it was shown, that at the supercritical CO2 conditions the compressive strength of the rankinite binder samples was higher than the OPC ones. The study showed that rankinite as a binder material is suitable for carbonation curing and could be used to produce carbonated construction materials.
ISSN:1583-3186
2457-502X