Abstract
This article examines the effect of biochar on the properties of carbonated wollastonite pastes. Phase composition and microstructure were evaluated using thermogravimetric analysis, Fourier transform infrared spectroscopy, x-ray diffraction, scanning electron microscopy, nitrogen adsorption, and x-ray microcomputed tomography. The results showed a higher compressive strength in the carbonated pastes with biochar compared to the control paste. This is attributed to the internal curing effect of the biochar, which results in pore structure refinement. Biochar was shown to effectively reduce drying shrinkage in the carbonated pastes, which in turn resulted in decreased drying shrinkage induced cracking. The CaCO3 content was shown to be dependent on the concentration of biochar as the paste with 2% biochar showed a lower and the paste with 4% biochar showed a higher CaCO3 compared to the control paste. Calcite was shown to comprise the primary polymorph of CaCO3 in the carbonated pastes with and without biochar.
Published Version
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