摘要
在35℃恒温水化反应90天条件下,制备了Na2O-CaO-Al2O3-SiO2-H2O系胶凝材料体系水化物,用X射线衍射法(XRD)对水化物进行了表征;用静态吸附法研究了该胶凝材料的化学组成,即(Ca+Na)-(Si+Al)摩尔比C(Ca+Na)/(Si+Al)、Al-Si摩尔比CAl/Si对Sr吸附性能的影响。结果表明,在实验条件下,制备的水化物主要是结晶程度差的C-S-H凝胶;当有Al存在时,生成少量的水化钙铝黄长石。当水化物中C(Ca+Na)/(Si+Al)=0.8时,吸附性能最佳;CAl/Si增大,吸附量增加。当C(Ca+Na)/(Si+Al)=0.8,CAl/Si=0.6时,水化物对Sr2+72h的吸附量可达0.0922mmol.g-1。
The hydration products from Na2O-CaO-Al2O3-SiO2-H2O cementitious material system were synthesized at 35 ℃ for 90 days and characterized by means of X-ray diffraction (XRD).The influence of chemical compositions of the hydration products,i.e.the atomic ratio of (Ca+Na) to (Si+Al) and Al to Si,on adsorption capacity of Sr was investigated by static adsorption method.The results show that the major hydration product is poor crystalline calcium silicate hydrate gel and a small amount of stratlingite generates in the present of Al.The adsorption capacity of the hydration products in which the atomic ratio of (Ca+Na) to (Si+Al) is 0.8 is the best in all environmental specimens.The adsorption capacity of Sr in the hydrate gel increases with the atomic ratio of Al to Si.The adsorption capacity of Sr in the hydrate gel in which the atomic ratio of (Ca+Na) to (Si+Al) and Al to Si is respectively 0.8 and 0.6 is 0.092 2 mmol/g at 72 h.
出处
《辐射防护》
CAS
CSCD
北大核心
2010年第3期164-169,共6页
Radiation Protection
基金
西南科技大学国防重点学科实验室重点培育项目
作者简介
李玉香(1964-),男,1987年7月毕业于四川建筑材料工业学院硅酸盐工程专业,1995年7月毕业于四川大学环境工程专业,获硕士学位,2005年7月毕业于中国工程物理研究院研究生部核燃料循环与材料专业,获博士学位,教授。E—mail:liyuxiang@swust.edu.cn