活化剂种类及含量对碱激发矿渣/红砂岩胶凝材料的影响  

Effect of Activator Type and Content on Alkali Activated Slag/Red Sandstone Cementitious Materials

作　　者：李平 马倩敏 谭绍恩 卿甜甜 何梅 LI Ping;MA Qianmin;TAN Shaoen;QING Tiantian;HE Mei(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Key Laboratory of Disaster Reduction in Civil Engineering,Kunming 650500,China;International Joint Laboratory for Green Construction and Intelligent Maintenance of Yunnan Province,Kunming 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]云南省土木工程防灾重点实验室,昆明650500 [3]云南省绿色建造与智慧运维国际联合实验室,昆明650500

出　　处：《材料导报》2024年第S02期260-264,共5页Materials Reports

基　　金：国家自然科学基金(52068038);云南省科技厅科技计划项目(202101AT070089,202202AG050020)。

摘　　要：本工作旨在研究不同的碱活化剂(NaOH或NaOH和水玻璃复掺)、不同的SiO_(2)/Na_(2)O比和不同的Na_(2)O含量在不同龄期下对碱激发矿渣-红砂岩复合胶凝材料(AASS)早期水化动力学、抗压强度和微观结构的影响。结果表明:活化剂类型、碱浓度及水玻璃模数均会影响复合胶凝材料的热演化速率和累积水化热。不同的活化剂具有不同类型的水化热演化曲线,差别较大。此外,激发剂溶液中M_(s)和Na_(2)O的含量对碱激发矿渣-红砂岩复合胶凝材料的性能有重要影响。当水玻璃模数为1.5时,试件强度基本达到最大值,最高强度可达79.2 MPa。NaOH激发的混合体系中存在水滑石,而水玻璃中没有水滑石。在早期(1 d)时,NaOH激发的混合体系强度较高,且强度随浓度的增加而增强;而后期水玻璃活化的混合体系具有更高的抗压强度,强度随浓度的增加而降低。C-(A)-S-H凝胶和水滑石的形成是AASS强度的主要贡献者。The aim of this paper is to investigate the effects of different alkali activators(NaOH or NaOH and water glass compounding),different SiO_(2)/Na_(2)O ratios and different Na_(2)O contents on the early hydration kinetics,compressive strength and microstructure of alkali-excited slag-red sandstone composite cementitious materials(AASS)at different ages.The results show that the type of activator,alkali concentration and water glass modulus affect the thermal evolution rate and cumulative heat of hydration of composite cementitious materials.Different activators have different types of heat of hydration evolution curves with large differences.In addition,the content of Ms and Na_(2)O in the exciter solution has an important effect on the properties of alkali activated slag-red sandstone composite cementitious materials.The strength of the specimens basically reached its maximum at a water glass modulus of 1.5,with a maximum strength of 79.2 MPa.The presence of hydrotalcite was found in the NaOH-excited mixed system,whereas no hydrotalcite was found in the water glass.At the early stage(1 d),the strength of the NaOH-excited mixed system was higher and the strength increased with the increase of concentration,while at the later stage,the water-glass-activated mixed system had higher compressive strength,and the strength weakened with the increase of concentration.The formation of C-(A)-S-H gel and hydrotalcite was the main contributor to the strength of AASS.

关 键 词：碱激发剂 矿渣 红砂岩 抗压强度 水化行为 微观结构 

分 类 号：TU526[建筑科学—建筑技术科学]