早龄期混凝土的力学和电性能研究  

Early Age Investigation of Mechanical and Electrical Properties

作　　者：魏小胜[1] 肖莲珍[2] 崔登国 康勇[1] 

机构地区：[1]华中科技大学工程与力学学院,武汉430074 [2]香港科技大学土木工程系,香港 [3]中国新材杭州设计研究院,杭州310003

出　　处：《武汉理工大学学报》2008年第6期52-55,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50778078)

摘　　要：选用不同水灰比(0.35、0.45和0.55)配制了不同强度等级的混凝土,测定和分析了不同水灰比的混凝土在早期水化期间的强度和电阻率等发展的特性,实验表明:较高强度等级的混凝土的早龄期强度发展速度较快,在电性能上表现为具有较大的电阻率增长速率和电阻率值,在力学行为上表现为具有较大的弹性模量和脆性;而较低强度的混凝土的特性相反。据此,能够获得电阻率和力学性能的相关性。在早龄期很难测得低强度混凝土的强度,但很容易地测得混凝土的电阻率和电阻率发展速率。因此,可以通过测定混凝土的电阻率来预测混凝土的强度发展。The various strength grades concrete mixes were obtained by the water-cement ratios of 0.35,0.45 and 0.55.The compression test and electrical resisitivity measurement of the concrete mixes were conducted at the early ages.The results showed that a higher strength grade concrete mix had the larger rate value in compressive strength obtained at the early ages,and in electrical resisitivity development,and the larger elastic modulus and the higher brittleness as well.Conversely,the mechanical properties and electrical resisitivity values were smaller and the rates were lower for a lower strength grade concrete mixes.The correlation of the mechanical properties and the electrical resisitivity could be obtained then. It was difficult to measure compressive strength of a concrete mix at very early age,however,it was much easier to measure its electrical resisitivity and get the development rate.Therefore,the compressive strength could be predicted by electrical resisitivity measurement,which could record whole hydration process from casting to hardening,and reflect porosity change and mechanical properties development.

关 键 词：混凝土 水化 早龄期 电阻率 力学性能 

分 类 号：TQ172.1[化学工程—水泥工业]