Carbonation Properties and Key Influencing Factors of Calcium-Rich Materials
ZHANG Qi
FENG Pan
SHEN Xuyan
HONG Jinxiang
Abstract：The carbon sequestration capacity of three calcium-rich materials,namely steel slag,tricalcium silicate(C3S)and carbide slag,was characterized by X-ray diffractometer,Fourier transform infrared spectrometer and thermal gravimetric analyzer.The pH value of carbonation system was measured.The micro-morphology and mechanical properties of before and after carbonation were measured by scanning electron microscope SEM and nano-indentation.The results show that the carbon sequestration ability is directly related to the chemical composition of the materials,especially the soluble calcium content.The carbide slag with the highest soluble calcium content has the highest carbon sequestration ability.The mechanical properties after carbonation depend on the micro-mechanical properties of carbonation products and the accumulation form of raw materials and carbonation products.Steel slag and C3S with rough micro-structure are more likely to be closely packed with carbonation products,and the micro-mechanical properties are enhanced after carbonation.However,the carbonation products are difficult to fill in the void of flake carbide slag particles,hence the micro-mechanical properties of carbide slag are weakened after carbonation.
Keywords：calcium-rich materialcarbon sequestration capacityphase analysispH valuemicro-morphologymicro-mechanical property
Publication Date：2025-02-27
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 153-159,167 )