摘要
以陶瓷抛光砖粉为混凝土掺合料,采用膨胀珍珠岩作活性集料,测试陶瓷抛光砖粉对碱集料反应的影响;利用电通量法测定标准养护28 d混凝土的电通量值,采用硝酸银显色法分别测定标准养护28 d水泥胶砂经10次、20次干湿循环后氯离子渗透深度,通过压汞法、SEM等测试手段分析掺陶瓷抛光砖粉水泥硬化浆体的显微结构,研究陶瓷抛光砖粉作掺合料对混凝土抗氯离子渗透性能的影响,并将之与粉煤灰对比。结果表明:混凝土电通量测试结果与水泥胶砂硝酸银显色法的测试结果之间具有较好相关性。陶瓷抛光砖粉作混凝土掺合料,能发挥其二次水化作用及对水泥硬化浆体孔结构的细化作用,增强混凝土抗氯离子渗透能力,抑制碱骨料反应。在相同掺量条件下,单掺抛光砖粉混凝土抗氯离子渗透能力优于掺试验用Ⅱ级粉煤灰混凝土。与单掺抛光砖粉相比,复掺抛光砖粉与粉煤灰,其后期抗氯离子能力较强。抛光砖粉与矿渣复掺效果优于抛光粉与粉煤灰复掺;随矿渣掺量的增加,混凝土抗氯离子渗透能力增加。
Effects of ceramic polishing powder（PP） on alkali aggregate reaction was studied by using expanded perlite as alkali reactive aggregate.Effects of PP on the chloride permeability of concrete were measured by silver nitrate colorimetric method and rapid chloride penetrability test.Microstructure of hydrated cement added PP was analysised by mercury intrusion pore measurement,SEM and EDS methods.Results show that PP as admixture restrain the alkali aggregate reaction and improve chlorine anion penetration resistance.The chloride permeability of concrete added PP is higher than that of fly ash under the same content.Compared to adding PP alone,chloride permeability of concrete at later age was improved by adding PP and fly ash compound.Chloride permeability of concrete admixing PP and slag is higher than that of admixing PP and fly ash.As content of slag increasing,chloride permeability of concrete increased.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2012年第6期1564-1570,1575,共8页
Bulletin of the Chinese Ceramic Society
基金
湖南省教育厅资助项目(10K026)
关键词
陶瓷抛光砖粉
掺合料
硝酸银显色法
电通量法
抗氯离子渗透
polishing powder
minerals admixture
silver nitrate colorimetric method
flux method
anti chloride penetration
