ENHANCING CARBON DIOXIDE (CO2) SEQUESTRATION EFFICIENCY WITH SANDCRETE-TALC COMPOSITE

ENHANCING CARBON DIOXIDE (CO2) SEQUESTRATION EFFICIENCY WITH SANDCRETE-TALC COMPOSITE

Abstract:

The global imperative to reduce CO2 emissions has led to exploration of alternative cement formulations using unconventional raw materials. This study focuses on optimizing CO2 absorption in sandcrete-talc composite materials. The materials were thoroughly characterized through Scanning Electron Microscopy (SEM), X-ray Diffractometer (XRD), and X-ray fluorescence (XRF) to understand their morphology, mineralogical composition, and oxide content.

The XRF analysis revealed that sand comprises 50.213% SiO2 and 16.001% Si, with trace amounts of other oxides and metals. Talc, a mineral in the composite, consists of 48.932% SiO2 and 24.86% MgO, while cement contains 52.911% CaO, 15.122% Ca, and 11.55% SiO2, along with minor quantities of alkalis and other metallic oxides.

A mathematical model was developed to predict CO2 concentration and compressive strength in sandcrete-talc composites, and it was optimized using a two-level four factorial design. The results indicated that with increasing curing time and higher proportions of talc and sand while keeping cement constant, both CO2 concentration and compressive strength increased. The optimized model predicted that after 28 days of curing under ambient conditions, the optimal CO2 concentration and compressive strength were 0.289 mol/dm³ and 3.506 N/mm², respectively.

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