I.Performance characteristics of epoxy coating prestressed steel strand chloride impermeability test device
1 Place aside 115mL of distilled water;
2 an epoxy waist between two glass plates with a 24mm opening
3—Place a 175 mL compartment of a 3 mol/L NaCl aqueous solution;
5-25mm center opening.
Second,the test device
The two compartments are separated by two glass panels,each having a 24 mm diameter opening in the center.The sample is clamped
Between the two glass plates,a diaphragm is formed at the opening.When the volume of liquid in the two compartments is 115mL and 175mL,respectively,
The level of the liquid level in each compartment is flush.The opening holding the diaphragm should be completely submerged in the solution.
A.188.8.131.52 A chloride ion meter capable of measuring a chloride ion concentration of less than 1 x 10-4 mol/L.
The sample is a cured metal epoxy coating with a metal-free matrix measuring 100 mm x 100 mm and a minimum thickness specified in 9.1.
The sample is placed between two glass plates in the container,the center of which is located at the opening of the glass plate.Inject 175mL concentration into the large compartment
It was a 3 mol/L aqueous solution of NaC,and 115 mL of distilled water was injected into the small compartment.Small measurement after 45 days at 23°C±2°C
Chloride ion concentration in aqueous solution
A.1.2.4 Test evaluation
The chloride ion concentration in the aqueous solution should be less than 1×10mol/L.
Gbt 21073-2007 Epoxy coated seven-wire prestressed steel strand