摘要
水泥矿物β-C2S的早期活性之所以发展慢是由于高温合成.如果改变合成条件,例如用n（CaO）/n（SiO2）=2的混合料先行进行水热处理,得到相应的水化硅酸钙,再在700~900℃下煅烧,则得到的β-C2S就具有较高的早期活性.根据20世纪80年代初以来国内外有关活性β-C2S的研究报道,就其中所用原料、水热合成的压力和温度、煅烧温度、产物的形貌和结晶度、性能等方面加以综合和分析,发现经水热合成水化硅酸二钙再低温烧成所得到的-βC2S早期活性之所以高的原因在于：产物颗粒细小、比表面积大（可以达到高温烧成β-C2S的8~10倍）、晶体的结晶度差、缺陷多.对水热合成形成水化硅酸钙的过程和β-C2S水化产物C-S-H中的硅氧四面体聚合度的变化作了较详细的分析.
The slow progress of the activity of β-C2S at early age is caused by high temperature synthesis.To change its condition of synthesis,for instance,by pretreating the mixture of n（CaO）/n（SiO2）=2 under hydrothermal condition to obtain hydrate of calcium silicate and then burning the product ar 700-900℃,the very active product β-C2S can be obtained.Based on the reports regarding the early activity of β-C2S published at home and abroad since 80＇s of the last century,the raw material,the temperature and pressure of the hydrothermal synthesis,the burning temperature,the morphology and the degree of crystallization of the product and other conditions were summarized and analysed.It is concluded that the high early hydration activity of β-C2S is due to its fine particles,high specific surface area which is 8-10 times greater than that prepared from high temperature.The various polymerization degrees distribution of 4-tetrahedron in the process of hydrothermal treatment and hydration of C2S are analysed as well.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2011年第2期145-154,共10页
Journal of Building Materials
关键词
水热合成
硅酸二钙
早期活性
聚合度
硅氧四面体
hydrothermal synthesis
dicalcium silicate
activity at early age
polymerization degree
4-tetrahedron
