不同掺量碱集料的活性交流阻抗谱  

AC Impedance Spectrum for Different Dosage Alkali Reactive Aggregate

作　　者：许修超[1] 施韬[2] 

机构地区：[1]台州职业技术学院,浙江台州317700 [2]浙江工业大学建筑工程学院,浙江杭州310014

出　　处：《材料科学与工程学报》2015年第5期754-758,共5页Journal of Materials Science and Engineering

摘　　要：本文以交流阻抗谱、膨胀率和MIP为研究方法,对不同掺量碱集料活性进行研究。结果表明:交流阻抗谱电化学参数与材料孔隙微观结构有着密切的联系。电阻Rs以及相角θ能表示碱集料活性的大小,可作为碱集料活性的评定方法;当混凝土中活性SiO2含量较高时,孔溶液中OH-离子会被活性SiO2颗粒大量吸附,导致参与碱硅酸反应的碱离子不足,碱硅酸反应生成的碱硅酸凝胶体数量减少。在碱硅酸反应中,活性碱集料与非活性集料之间的比值存在最劣点。Taking AC impedance spectroscopy、volume expansion measurement and mercury intrusion porosity（MIP）as the research methods,study on the different dosage alkali reactive aggregate was carried out in this article.Results show that the parameter of AC impedance spectroscopy is connected with pore microstructure in concrete.Resistance of pore solution Rsand phase angleθcan be used to evaluate the alkali reactivity of the aggregate;SiO2adsorbs OH-ions in great deal in the pore solution when the content of active SiO2 is high.It leads to that OH-ion content is not enough to produce alkaline silicic acid gel.The worst point exists between the active alkali aggregate and inactive aggregate in concrete Alkali silica reaction.

关 键 词：交流阻抗谱 碱硅酸反应 最劣点 

分 类 号：TU503[建筑科学—建筑技术科学]