电阻率法研究混凝土早期微观性能  

STUDY ON THE EARLY-AGE MICRO-PROPERTIES OF CONCRETE USING ELECTRICAL RESISTIVITY METHOD

作　　者：洪天从[1] 金南国[1] 傅兴有 

机构地区：[1]浙江大学建工学院土木工程系,杭州310058 [2]宁波象山宏鑫混凝土有限公司,浙江宁波315706

出　　处：《低温建筑技术》2012年第5期1-2,共2页Low Temperature Architecture Technology

基　　金：国家重点基础研究发展计划(973计划;编号2009CB623200);国家自然科学基金项目(编号51178413)

摘　　要：利用非接触电阻率仪器,设计了一种新型的测试混凝土水泥水化和密实度变化的装置。试验对w/c 0.35和0.53混凝土12h,18h,1d,3d,7d龄期进行测试,试验结果发现w/c越低,混凝土电阻率越高,早期水化越快,密实度也越高。并通过试验得出了混凝土界面过渡区在3～7d形成和扩展,且w/c越高,界面过渡区对混凝土渗透性影响越大。In this paper, a new device was devised to measure the cement hydration and compactness of concrete based on non-contacting electrical resistivity measurement instrument. The concretes of w/c 0. 35, 0. 53, whose curing time respectively was 12h, 18h, ld, 3d, 7d, were studied. The experiments show that, as w/c becomes lower, the electrical resistivity and compactness of concrete turn higher, and the cement hydration gets faster; the results show that interface transition zone of concrete is formed and extended during 3 - 7 d obtained ; the higher w/c is, the more ITZ＇ s influence on concrete＇ s permeability is.

关 键 词：非接触 电阻率 水泥水化 密实度 界面过渡区 

分 类 号：TU528[建筑科学—建筑技术科学]