亚硝酸型Cl^(-)固化剂在海砂混凝土中的固化机理研究  

Study on Curing Mechanism of Nitrite Type Cl^(-)Curing Agent in Sea Sand Concrete

作　　者：明阳 肖登凯[1,2,4] 李玲 李忻恒 朱奇阳[1,2,4] 黄登科 任昊 MING Yang;XIAO Dengkai;LI Ling;LI Xinheng;ZHU Qiyang;HUANG Dengke;REN Hao(College of Civil Engineering,Guilin University of Technology,Guilin 541004,Guangxi,China;Guangxi Key Laboratory of Green Building Materials and Construction Industrialization,Guilin 541004,Guangxi,China;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources,Guilin University of Technology,Guilin 541004,Guangxi,China;Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials,Guilin 541004,Guangxi,China)

机构地区：[1]桂林理工大学土木工程学院,广西桂林541004 [2]广西绿色建材与建筑工业化重点实验室,广西桂林541004 [3]桂林理工大学有色金属矿产勘查与资源高效利用省部共建协同创新中心,广西桂林541004 [4]广西工业废渣建材资源利用工程技术研究中心,广西桂林541004

出　　处：《材料导报》2025年第8期116-122,共7页Materials Reports

基　　金：广西科技重大专项(桂科AA22068073-3);中央引导地方科技发展资金项目(20221229);国家自然科学基金(52368030);广西绿色建材与建筑工业化重点实验室基金(桂科能22-J-21-20)。

摘　　要：海砂中含有大量氯离子是阻碍其在水泥基材料中应用的主要瓶颈。本工作使用NaAlO_(2)、Ca(OH)_(2)、Ca(NO_(2))_(2)三种材料,采用水热法制备了一种新型的亚硝酸型氯离子固化剂(NO_(2)-ClCA),并将其应用于水泥基材料中,该固化剂表现出良好的氯离子固化效果。通过XRD、SEM等手段对NO_(2)-CICA的作用机理进行了表征分析。结果表明:NaAlO_(2)和Ca(NO_(2))_(2)质量分数分别为15%和6%,搅拌速度为30 r/s,反应温度为60℃是NO_(2)-ClCA的最佳制备工艺。通过在水泥基材料中添加NO_(2)-ClCA,可最终实现氯离子固化1.33 mg/g。NO_(2)-ClCA主要成分为NO_(2)^(-)-AFm与C_(3)AH_(6);NO_(2)-ClCA对氯离子的固化作用主要为化学固化。具体表现为,NO_(2)^(-)-AFm与孔溶液中游离的Cl^(-)发生阴离子置换反应生成Friedel’s盐,从而提高体系的化学结合能力,C_(3)AH_(6)在参与阴离子置换反应的同时额外补充了体系中的钙相与铝相,促使C-S-H凝胶向C-(A)-S-H凝胶转化,提高体系的物理吸附能力。The large amount of chloride ions contained in sea sand is the main bottleneck hindering its application in cement-based materials.In this work,three materials,NaAlO_(2),Ca(OH)_(2),and Ca(NO_(2))_(2),were used to prepare a new nitrite-type chloride ion curing agent(NO_(2)-ClCA)by hydrothermal method.Through adding this agent in the cement-based materials,it showed a good chloride ion curing ability.Finally,the mechanism of NO_(2)-ClCA was analyzed using XRD,SEM and other methods.The results showed that the optimal method to get NO_(2)-ClCA is with the mass fraction of NaAlO_(2) and Ca(NO_(2))_(2) of 15%and 6%,respectively,the stirring rate of 30 r/s,and the reaction temperature of 60℃.By adding NO_(2)-ClCA to cement-based materials,chloride ion curing of 1.33 mg/g can be achieved.The main components of NO_(2)-ClCA are NO_(2)^(-)-AFm and C_(3)AH_(6).The curing effect of NO_(2)-ClCA on chloride ions is mainly chemical curing.Specifically,NO_(2)^(-)-AFm reacts with free Cl^(-)in the pore solution to form Friedel's salt,which improves the chemical binding capacity of the system.C_(3)AH_(6) participates in the anion replacement reaction and supplements the calcium and aluminum phases in the system,which can promote the conversion of C-S-H gel to C-(A)-S-H gel to improve the physical adsorption capacity of the system.

关 键 词：氯离子固化 正交试验 海砂 胶凝材料 水化产物 定量分析 

分 类 号：TU528[建筑科学—建筑技术科学]