Determination of tricalcium silicates crystal forms in belite-barium calcium sulphoaluminate cement

摘要

Chemical method of extraction was adopted in the study, and aqueous solution of potassium hydroxide and sucrose (KOSH) was used to obtain the clinker rich in silicate phases (alite and belite) in order to get the crystal forms of tricalcium silicates (C_3S) in the belite-barium calcium sulphoaluminate cement clinker. The crystal forms of C_3S were finally determined by XRD (X-ray diffraction) spectrums through its characteristic windows of the diffraction spectrums. Results shows that, C_3S exists in the innovative cement system mainly in the form of M1; C_(2.75)B_(1.25)A_3 S can completely dissolve in KOSH solution while its dissolution is inhibited in the cement system; after KOSH treatment, diffraction peaks of C_4AF disappear totally and peaks of C_3A has weakened to great extent; for the cement clinker, the clinker ground for 90min has the best extraction rate.