碱-矿渣-偏高岭土基地聚物与骨料的界面粘结机理  

Mechanism of Interface Bonding Between Alkali-Slag-Metakaolin Based Geopolymer and Aggregates

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作  者:崔潮 李渊[1] 党颖泽 王岚[1] 彭晖[2] CUI Chao;LI Yuan;DANG Yingze;WANG Lan;PENG Hui(Key Laboratory of Civil Engineering Structure and Mechanics,Inner Mongolia University of Technology,Hohhot010051,China;tional-local Joint Engineering Laboratory for Southern Regional Bridge Long-tem Performance Improvement Technology,Changsha University of Science&Technology,Changsha 410114,China)

机构地区:[1]内蒙古工业大学内蒙古自治区土木工程结构与力学重点实验室,呼和浩特010051 [2]长沙理工大学南方地区桥梁长期性能提升技术国家地方联合工程实验室,长沙410114

出  处:《材料导报》2025年第1期186-193,共8页Materials Reports

基  金:国家自然科学基金(52368035)。

摘  要:地聚物混凝土通过碱激发作用形成,其内部碱浓度可以达到水泥的数十倍,因此地聚物的碱骨料反应性能亟待探索。本工作详细探讨了不同配合比条件及骨料种类对碱-矿渣-偏高岭土基地聚物与骨料界面粘结强度的影响,并通过微观分析方法阐述了界面粘结机理。试验结果表明,在激发剂模数为1.2、液固比为0.4的条件下,地聚物与花岗岩、玄武岩以及石灰岩三种骨料均获得了最高的粘结强度。随着碱激发剂模数和液固比的增加,界面粘结强度均逐渐降低,但地聚物与花岗岩的粘结强度受激发剂碱性影响较弱。不同骨料在碱激发剂作用下均会产生溶解反应,溶解出的活性Si、Al以及Ca元素可以在界面处与地聚物进一步进行地聚合反应提高界面过渡区(Interfacial transition zone,ITZ)的密实程度。Geopolymer concrete,formed through alkaline activation,has an internal alkaline concentration of dozens times higher than that of cement.Therefore,the reaction properties between geopolymers and aggregates need to be explored further.This work discussed in detail the influence of different mix ratios and aggregate types on the interface bonding strength of the alkali-slag-metakaolin based geopolymer and aggregate.Mi-croscopic analysis methods were used to elucidate the interface bonding mechanism.The experimental results showed that under the conditions of an alkali module of 1.2,and a liquid-to-solid ratio of 0.4,the samples with granite,basalt,and limestone respectively got the highest bonding strength.As the modulus of the alkaline activator and the liquid-to-solid ratio increased,the bonding strength of the interface decreased gradually;however,the bond strength between the geopolymer and granite was not significantly affected by the alkalinity of the activator.Under the action of the alkaline activator,three kinds of aggregates underwent dissolution reactions,and the dissolved active Si,Al,and Ca elements should react with the geopolymer further at the interface,which should improve the compactness of the ITZ.

关 键 词:地聚物 骨料 界面过渡区 粘结强度 粘结机理 

分 类 号:TU528.41[建筑科学—建筑技术科学]

 

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