AASHTOT2 77或ASTMC12 0 2通过对混凝土试件两端加一 60V的直流电压 ,测量其 6小时通过的电量 ,并以此评定混凝土抗氯离子渗透性等级。该方法本质上测量的是混凝土电导率 ,其值的大小取决于混凝土的孔隙结构和孔溶液的化学成分。由于混凝土中的氯离子传质几乎不受孔溶液的化学成分影响 ,故用所测量通过混凝土的电量划分其抗氯离子渗透性的等级是不当的。 AASHTOT2 77 or ASTMC12 0 2 The concrete was tested for its resistance to chloride ion penetration by applying a 60 V dc voltage to both ends of the concrete specimen and measuring the amount of electricity passing through it for 6 hours. The method essentially measures the electrical conductivity of concrete, the magnitude of which depends on the pore structure of the concrete and the chemical composition of the pore solution. Since the mass transfer of chloride ions in concrete is hardly affected by the chemical composition of the pore solution, it is improper to classify the chloride ion permeability rating by the amount of electricity measured through the concrete.