熟料煅烧气氛对水泥与减水剂相容性的影响  

Influence of Firing Atmosphere of Clinker on Compatibility of Cement with Superplasticizer

作　　者：吴笑梅[1] 樊粤明[1] 

机构地区：[1]华南理工大学材料学院,广州510640

出　　处：《材料导报》2009年第8期62-64,共3页Materials Reports

基　　金：华南理工大学自然科学基金项目(324-E5040150)

摘　　要：采用Marsh筒法研究了还原气氛与正常气氛条件下煅烧熟料磨制水泥与减水剂的相容性,并通过XRD与岩相分析法研究了熟料的矿物组成与矿物形态,揭示了煅烧气氛对水泥与减水剂相容性影响的内在原因。结果表明,还原气氛条件下,熟料中三价铁被还原,形成钙铁橄榄石(CaO.FeO.SiO2)类矿物,使C4AF含量减少,原本可固溶在C4AF矿物中的部分氧化铝也随之减少,从而增加了C3A的实际含量;且熟料结粒粗大,升重较高,冷却效果较差,造成C3A大量析晶,导致水泥与减水剂的饱和点增大,流动性经时损失变大,相容性显著变差。Compatibility of cement and superplasticizer whose clinkers are sintered in reducing atmosphere and normal atmosphere respectively is researched through Marsh Cone test. Mineral composition and morphology are tested by XRD and petrographic analysis. The inherent cause of firing atmosphere of clinker on the compatibility is presented. The results show that under the condition of reducing atmosphere, Fe^3＋ is deoxidisated and CaO·FeO·SiO2 is formed, the amount of C4AF is reduced, and it causes the amount of C4A added as the solid solubility of Al2O3 in C4 AF reduced. Also the cooling efficiency is declined because of the large nodulization and liter weight of clinker, and it leads crystallization of C3 A to become easy and large. All those causes result in the raising of satuation point and fluidity loss with time and the poor capatibility of cement with superplasticized.

关 键 词：熟料煅烧气氛 水泥与减水剂相容性 C3A 析晶 MARSH筒法 

分 类 号：TQ172.12[化学工程—水泥工业]