THE USE OF SULPHATE FLY ASH TO SYNTHESIS A REACTIVE α-C2S CEMENT
The synthesis of α-C2S belite cement, starting from fly-ash of system CaO-SiO2-Al2O3-SO3, and by using the hydrothermal method in alkaline solution, was the objective of this study. The lime deficit in these ashes was compensated by the addition of slaked lime from lime bagging workshops. The hydrothermal treatment of mixture was carried out in demineralized water, NaOH or KOH solution, maintained under agitation at temperature below 100℃ and atmospheric pressure. The dehydration and calcination of the mixtures at temperature between 800 and 1100℃ allowed obtaining α-C2S-rich cement. The optimization of synthesis parameters (temperature and time of agitation, pH of solution, temperature and duration of mixture burning) was also studied. The phase formation during various synthesis stages was studied by X-ray diffraction (XRD). Other techniques such as SEM and EDX were used to characterize the cement minerals. The results obtained showed that these ashes can form belite cement composed of only one bicalcium silicate phase (α-C2S).
Larbi KACIMI Martin CYR Pierre CLASTRES
Laboratoire de Génie des Procédés, Département de Chimie, Université des Sciences et de la Technolog Laboratoire Matériaux et Durabilité des Constructions (LMDC)-INSA, Toulouse, France
国际会议
北京
英文
1-6
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）