Influence of mechanical and chemical activation on the hydraulic properties of gamma dicalcium silicate

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• 作者：Lubica Kriskova ; Yiannis Pontikes ; Fei Zhang ; 脰zlem Cizer ; Peter Tom Jones ; Koenraad Van Balen ; Bart Blanpain
• 关键词：Hydration (A) ; Gamma dicalcium silicate (D) ; Characterisation (B) ; Stainless steel slag
• 刊名：Cement and Concrete Research
• 出版年：January, 2014
• 年：2014
• 卷：55
• 期：Complete
• 页码：59-68
• 全文大小：2490 K

文摘

The aim of this work is to clarify the effect of various activation methods on the hydraulic properties of 纬-C₂S, one of the main phases in stainless steel slags. Synthetic C₂S, sintered at 1450 掳C for 20 h, consisted of 88 wt.% 纬-C₂S and 12 wt.% 尾-C₂S. Two activation paths were followed: mechanical activation, by means of high energy milling, and chemical activation, by means of NaOH and Na₂CO₃ addition. Results indicated that both mechanically and chemically activated 纬-C₂S hydrated at ambient temperature. XRD analysis showed that the amount of amorphous phase increased during hydration, whereas TGA/DTG data revealed weight loss in the decomposition region of C-S-H. Analyses by FTIR and SEM also support that C-S-H is one of the main hydration products. Mortars prepared with mechanically and chemically activated 纬-C₂S developed mechanical strength, reaching the values of 9.1 MPa and 10.3 MPa at 90 days, respectively.