【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。更多还原

【Abstract】 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?℃ were studied by means of XRD、TG-DSC、SEM and their solubilities were determined too. The results showed 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?℃ and 350?℃; 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·2SiO₂·nH₂O is higher than that of CSH gel,the former is about three times as much as the latter.更多还原