1.深圳大学 土木与交通工程学院，广东 深圳 518060;2.深圳大学 广东省滨海土木工程耐久性重点实验室，广东 深圳 518060;3.深圳大学 深圳市低碳建筑材料与技术重点实验室，广东 深圳 518060;4.兰州交通大学 土木工程学院，甘肃 兰州 730070;5.兰州交通大学 道桥工程灾害防治技术国家地方联合工程实验室，甘肃 兰州 730070
刘源涛（1996—），男，湖北黄冈人，深圳大学博士生.E-mail：1294126714@qq.com
王琰帅（1988—），男，河南禹州人，深圳大学教授，博士生导师，博士.E-mail：yswang@szu.edu.cn
TU526
“十四五”国家重点研发计划项目（2022YFB2602600）；国家自然科学基金-铁路基础研究联合基金资助项目（U2368209）；广东省科技厅粤港科技合作项目（2023A0505010020）
LIU Yuantao
College of Civil and Transportation Engineering， Shenzhen University， Shenzhen 518060， China;Guangdong Province Key Laboratory of Durability for Marine Civil Engineering， Shenzhen University， Shenzhen 518060， China;Shenzhen Key Laboratory for Low-Carbon Construction Material and Technology， Shenzhen University， Shenzhen 518060， ChinaDONG Biqin
College of Civil and Transportation Engineering， Shenzhen University， Shenzhen 518060， China;Guangdong Province Key Laboratory of Durability for Marine Civil Engineering， Shenzhen University， Shenzhen 518060， China;Shenzhen Key Laboratory for Low-Carbon Construction Material and Technology， Shenzhen University， Shenzhen 518060， ChinaWANG Yanshuai
College of Civil and Transportation Engineering， Shenzhen University， Shenzhen 518060， China;Guangdong Province Key Laboratory of Durability for Marine Civil Engineering， Shenzhen University， Shenzhen 518060， China;Shenzhen Key Laboratory for Low-Carbon Construction Material and Technology， Shenzhen University， Shenzhen 518060， China1.College of Civil and Transportation Engineering， Shenzhen University， Shenzhen 518060， China;2.Guangdong Province Key Laboratory of Durability for Marine Civil Engineering， Shenzhen University， Shenzhen 518060， China;3.Shenzhen Key Laboratory for Low-Carbon Construction Material and Technology， Shenzhen University， Shenzhen 518060， China;4.School of Civil Engineering， Lanzhou Jiaotong University， Lanzhou 730070， China;5.Bridge Engineering National Local Joint Engineering Laboratory of Disaster Prevention and Contral Technology， Lanzhou Jiaotong University， Lanzhou 730070， China
为研究微晶氢氧化铝凝胶（AH3）含量对高碱碳铝酸盐胶凝材料性能的影响，设计了氢氧化钠与氢氧化铝复合溶液、偏铝酸钠溶液复配激发石灰石粉的方案.结果表明：随着激发剂中偏铝酸钠溶液的占比从0%逐步增至100%，基体中的单碳型碳铝酸钙含量相对稳定，而微晶AH3的含量则逐渐增加，三水铝石的含量相应减少；微晶AH3的平均晶粒尺寸约19.5 nm，显著小于三水铝石的中值粒径5.82 μm，因而微晶AH3具有更大的比表面积和更强的胶凝性能；随着微晶AH3含量的增加，基体中凝胶孔的占比提升，孔隙结构更致密；试样抗压强度与微晶AH3含量之间呈线性正相关关系，即微晶AH3的含量越高，试样的强度越高.
To investigate the impact of microcrystalline aluminum hydroxide gel（AH3） content on the properties of high-alkali carboaluminate cementitious materials， a composite activation scheme was designed using a co-mixed solution of sodium hydroxide， aluminum hydroxide and a sodium aluminate solution， to activate limestone powder. The results indicate that as the proportion of sodium aluminate solution in the activator mixture increases from 0% to 100%， the content of monocarboaluminate in the matrix remains relatively stable， while the content of microcrystalline AH3 progressively increases and the content of gibbsite correspondingly decreases. The average crystallite size of microcrystalline AH3 is approximately 19.5 nm， which is significantly smaller than the median particle size of 5.82 μm for gibbsite， thus endowing it with a larger specific surface area and superior cementitious properties. With the increase of microcrystalline AH3 content， the proportion of gel pores in the matrix increases， resulting in a more compact pore structure. Furthermore， there is a linear positive correlation between compressive strength of samples and the content of microcrystalline AH3， suggesting that higher content of microcrystalline AH3 correlates with greater strength of samples.
刘源涛,张戎令,董必钦,王琰帅.微晶
