摘要
碱骨料反应是土木工程行业常见危害之一,为推进地聚物的应用,需要研究掺玄武岩骨料的碱激发偏高岭土基地聚物砂浆在高温、高碱环境下的碱骨料反应及其变形行为。研究掺两种不同粒径玄武岩骨料的偏高岭土基地聚物砂浆在80℃、2 mol/L的NaOH溶液中养护14 d后的变形行为,采用XRF、XRD、SEM等手段分析原料和产物的组成及微观结构。研究结果表明:玄武岩在地聚物中会发生碱硅反应,但地聚物碱硅反应不具有可持续性;地聚物浆体部分最终会形成沸石结构,其特殊的笼式结构能够吸附和固溶大量有害碱,能让地聚物材料有效地避免碱骨料反应的危害。
Alkali aggregate reaction is one of the common hazards in civil engineering.In order to promote the application of geopolymers,the alkali aggregate reaction and deformation behavior of alkali-activated metakaolin base polymer mortar mixed with basalt aggregate should be analyzed under high temperature and high alkali environment.Metakaolin based polymer mortar mixed with two different particle sizes of basalt aggregate was prepared.The deformation behavior was studied,when those was put in 80℃,2 mol/L NaOH solution curing for 14 days.The composition and microstructure of raw materials and products were analyzed using XRF,XRD,SEM.The results show that alkali silicon reaction of basalt is induced in geopolymer.However,the alkali silicon reaction is not sustainable.The slurry part of geopolymer will form zeolite structure eventually.A large number of harmful alkali can be absorbed and solid dissolved resulting from the special cage structure.Consequently,geopolymer material can effectively avoid the harm of alkali aggregate reaction.
作者
周晨林
钟正强
彭晖
罗冬
ZHOU Chenlin;ZHONG Zhengqiang;PENG Hui;LUO Dong(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410004,China;National-Local Joint Engineering Laboratory of Technology for Long-term Performance Enhancement of Bridges in Southern District,Changsha University of Science&Technology,Changsha 410114,China)
出处
《交通科学与工程》
2022年第2期82-86,共5页
Journal of Transport Science and Engineering
