A novel analytical method with the guarded-hot-box (GHB) in investigating the thermal resistance of heat-resistant fabrics is described and the analytical method is also presented in this paper. The new apparatus is c...A novel analytical method with the guarded-hot-box (GHB) in investigating the thermal resistance of heat-resistant fabrics is described and the analytical method is also presented in this paper. The new apparatus is capable of measure thermal resistance of the fabrics in high temperature up to an average applied temperature of 250℃. The maximum measurement error of the apparatus is 6.5% and relative error is less than 2.8% between the introduced method and standard given value. In the GHB method, air layer thickness is the most important factor that influences measurement value of thermal resistance of heat-resistant fabrics. Results show that the method is more accurate and efficient than GB11048-89 one in measuring thermal resistance of heat-resistant fabrics.展开更多
采用普通三电极体系评价现场大钢筋混凝土结构时,辅助电极面积与钢筋表面积相差很大而导致极化电力线难以均匀分布在钢筋表面,极化面积不确定。为解决这一问题,采用护环电极(Guard Ring Elec-trode,GRE or GE)方法即在普通三电极法基础...采用普通三电极体系评价现场大钢筋混凝土结构时,辅助电极面积与钢筋表面积相差很大而导致极化电力线难以均匀分布在钢筋表面,极化面积不确定。为解决这一问题,采用护环电极(Guard Ring Elec-trode,GRE or GE)方法即在普通三电极法基础上添加一圆环形护环电极(GE),通过GE电流将辅助电极(CE)电流限制在CE投影面积内,试验中评价了不同腐蚀状态的钢筋,并与均匀极化法对比,结果表明:在正确的电流限制下,护环电极法能够较准确地评价钢筋腐蚀状态,该方法尤其适合已脱钝体系。展开更多
基金Supported by Foundation of Innovation Fund of Doctoral Thesis(No.107 06 0019015)
文摘A novel analytical method with the guarded-hot-box (GHB) in investigating the thermal resistance of heat-resistant fabrics is described and the analytical method is also presented in this paper. The new apparatus is capable of measure thermal resistance of the fabrics in high temperature up to an average applied temperature of 250℃. The maximum measurement error of the apparatus is 6.5% and relative error is less than 2.8% between the introduced method and standard given value. In the GHB method, air layer thickness is the most important factor that influences measurement value of thermal resistance of heat-resistant fabrics. Results show that the method is more accurate and efficient than GB11048-89 one in measuring thermal resistance of heat-resistant fabrics.
文摘采用普通三电极体系评价现场大钢筋混凝土结构时,辅助电极面积与钢筋表面积相差很大而导致极化电力线难以均匀分布在钢筋表面,极化面积不确定。为解决这一问题,采用护环电极(Guard Ring Elec-trode,GRE or GE)方法即在普通三电极法基础上添加一圆环形护环电极(GE),通过GE电流将辅助电极(CE)电流限制在CE投影面积内,试验中评价了不同腐蚀状态的钢筋,并与均匀极化法对比,结果表明:在正确的电流限制下,护环电极法能够较准确地评价钢筋腐蚀状态,该方法尤其适合已脱钝体系。
