We adopted a notch method to study the influence of crack width （macro level） on chloride transport and binding of cracked concrete under a non-steady state migration test. The results show that migration coefficien...We adopted a notch method to study the influence of crack width （macro level） on chloride transport and binding of cracked concrete under a non-steady state migration test. The results show that migration coefficient of cracked concrete increases with increasing crack width up to a critical value （0.43 mm）, for the whole concrete or the area close to crack; the increase of migration coefficient could be independent from crack parameter when a critical crack width is reached. For chloride binding, Langmuir isotherms of cracked concrete samples exhibit the similar decreasing trend as crack width increases from 0.27 to 1.96 mm. The increased current value could be responsible for the trend based on the hypothesis of electric force.展开更多
To investigate the influence of initial curing conditions and exposure environments on chloride ions’migration in concrete,the specimens that were cured in different conditions and placed in several marine environmen...To investigate the influence of initial curing conditions and exposure environments on chloride ions’migration in concrete,the specimens that were cured in different conditions and placed in several marine environments were studied.The amount of chloride ions passing through the specimen’s section was monitored in the accelerated chloride migration test.The effective chloride diffusion coefficients(De)were calculated from the steadystate on the basis of Nernst-Planck’s equation.The results indicated that the initial curing conditions and the wet-dry interval of external environments have coupling influence on effective diffusion coefficient of chloride ion significantly.De reflected the density and pore connectivity of concrete.The co-effects of the initial curing condition and following exposure environment should be taken into account in durability design for concrete structure located in marine environment.展开更多
Because of high development costs of IC (Integrated Circuit) test programs,recycling ekisting test programs from one kind of ATE (Automatic Test Equip-ment) to another or generating directly from CAD simulation module...Because of high development costs of IC (Integrated Circuit) test programs,recycling ekisting test programs from one kind of ATE (Automatic Test Equip-ment) to another or generating directly from CAD simulation modules to ATEis more and more vauable. In this papert a new approach to migrating test pro-grams is presented. A virtual ATE model based on object-oriellted paradigm isdeveloped; it runs Test C++ (an intermediate test control language) programsand TeIF (Test Intermediate Format - an intermediate pattern), migrates testprograms among three kinds of ATE (Ando DIC8032, Schlumberger S15 andGenRad 1732) and gellerates test patterns from two kinds of CAD (Daisy andPanda) automatically.展开更多
基金Funded by China Scholarship Council,the Special Research Fund(BOF)of Ghent UniversityNational Natural Science Foundation of China(No.51178363)
文摘We adopted a notch method to study the influence of crack width （macro level） on chloride transport and binding of cracked concrete under a non-steady state migration test. The results show that migration coefficient of cracked concrete increases with increasing crack width up to a critical value （0.43 mm）, for the whole concrete or the area close to crack; the increase of migration coefficient could be independent from crack parameter when a critical crack width is reached. For chloride binding, Langmuir isotherms of cracked concrete samples exhibit the similar decreasing trend as crack width increases from 0.27 to 1.96 mm. The increased current value could be responsible for the trend based on the hypothesis of electric force.
基金supports from JSPS–NSFC Scientific Cooperation Program(No.50538070)the National Natural Science Foundation of China(Grant No.50811140088).
文摘To investigate the influence of initial curing conditions and exposure environments on chloride ions’migration in concrete,the specimens that were cured in different conditions and placed in several marine environments were studied.The amount of chloride ions passing through the specimen’s section was monitored in the accelerated chloride migration test.The effective chloride diffusion coefficients(De)were calculated from the steadystate on the basis of Nernst-Planck’s equation.The results indicated that the initial curing conditions and the wet-dry interval of external environments have coupling influence on effective diffusion coefficient of chloride ion significantly.De reflected the density and pore connectivity of concrete.The co-effects of the initial curing condition and following exposure environment should be taken into account in durability design for concrete structure located in marine environment.
文摘Because of high development costs of IC (Integrated Circuit) test programs,recycling ekisting test programs from one kind of ATE (Automatic Test Equip-ment) to another or generating directly from CAD simulation modules to ATEis more and more vauable. In this papert a new approach to migrating test pro-grams is presented. A virtual ATE model based on object-oriellted paradigm isdeveloped; it runs Test C++ (an intermediate test control language) programsand TeIF (Test Intermediate Format - an intermediate pattern), migrates testprograms among three kinds of ATE (Ando DIC8032, Schlumberger S15 andGenRad 1732) and gellerates test patterns from two kinds of CAD (Daisy andPanda) automatically.
