摘要
为查明放射性核素锶与硅酸盐水泥(基本组成为CaO和SiO2)-H2O体系之间的作用机制,运用XRD、TG-DSC、SEM等测试技术,研究了80℃,水热条件下,CaO-SrO-硅灰-H2O体系的水化产物,测定了该水化产物的溶解度。结果表明:在实验条件下,Sr2+能取代水化硅酸钙凝胶中Ca2+而形成固溶体,并使CSH凝胶结构更趋无序;SrO能与硅灰、水发生反应,优先生成柱状晶态产物3SrO·2SiO2·nH2O;3SrO·2SiO2·nH2O在290～350℃之间脱去结晶水;水化硅酸钙锶固溶体以絮状凝胶为主,而3SrO·2SiO2·nH2O则为柱状晶体且无交叉连生现象;钙硅比为1的CSH凝胶溶解度为0.567mmol·L-1;3SrO·2SiO2·nH2O比CSH凝胶的溶解度大,约为3倍。
In order to prove the interaction mechanism between radionuclide strontium and Portland cement (elementary composition: CaO and SiO2)-H2O system, the hydrothermally synthesized products of CaO-SrO-silicon fume-H2O system at 80°C were studied by means of XRD, TG-DSC, SEM and their solubilities were determined too. The results show that Sr2+ can replace Ca2+ in calcium silicate hydrate (CSH) gel to form solid solution and make the structure of CSH gel more disordered under the experimental conditions; highly crystalline 3SrO·2SiO2·nH2O firstly results from the reaction of SrO with silicon fume and water; dehydration of 3SrO·2SiO2·nH2O takes place between 290°C and 350°C; calcium-strontium silicate hydrate solid solution chiefly exhibits cotton-like gel while 3SrO·2SiO2·nH2O exhibits prism-like crystals without intergrowth, the solubility of CSH gel whose Ca/Si ratio is 1 is 0.567 mmol·L-1 and the solubility of 3SrO·2Si02·nH2O is higher than that of CSH gel, the former is about three times as much as the latter.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2005年第1期69-73,共5页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(10376028)
中国工程物理研究院基金资助项目
关键词
水化硅酸钙
3SrO·2SiO2·nH2O
水热合成
固溶体
溶解度
Calcium compounds
Dehydration
Fume control
Hydrates
Hydrothermal synthesis
Solid solutions
Solubility
Strontium compounds
