Concrete surface coating test method: anti-chloride ion permeability test

C.2 Chloride ion permeability test

C.2.1 The test should use a plexiglass test tank with an inner diameter of 40~50m, a wet Film Thickness Gauge and a magnetic Thickness Gauge.

C.2.2 The test should be carried out according to the following steps.

C.2.2.1 The movable coating sheet used in the test is made by using 150mmx150mm coating fineness paper as the reinforcing material, which is spread on the glass plate, and the supporting coating for the test is firstly coated with the bottom layer according to the requirements of the instruction manual. One coat of paint, two coats of intermediate paint, and one coat of surface coat. After each coating film is applied, the fineness paper should be lifted off the glass plate immediately and hung on the rope, and the next coating should be applied after 24 hours, and the coating should be repeated in this way, and the total thickness of the coating dry film formed by the coating should be controlled by a wet film gauge It is 250~300m. According to this method, a total of three active coating sheets were made. After it is made, hang it indoors for 28 days and then measure the thickness of the coating sheet with a magnetic Thickness Gauge for testing.

C.2.2.2 Cut the prepared active coating sheet into a test piece with a diameter of 60mm, and carry out the chloride ion penetration resistance test according to the method shown in Figure C.2.2. Make the painted side of the test piece face 3% saline; the other side of the fineness paper faces distilled water. Three sets of devices are shared. The test was carried out at the chloride ion content in distilled water was measured.

Figure C.2.2 Schematic diagram of coating resistance to chloride ion penetration test device

1-3% salt water; 2-distilled water; 3-test piece (active coating sheet); 4-silicone rubber filler; 5-silicone rubber plug; 6- test tank with an inner diameter of 40

C.2.3 The test result report shall include the following contents

(1) The name of the paint manufacturer;

(2) The names, grades and production batch numbers of various coatings;

(3) Chloride ion penetration through the coating sheet (mg/m2.d).