AS 14448:2020 Low modulus adhesives for exterior tile finishing (ISO 14448:2016, MOD)

AS 14448:2020 Low modulus adhesives for exterior tile finishing (ISO 14448:2016, MOD). 7.3.2.2 Placing of tile When the adhesive is spread, place a ceramic tile as defined in 7.3.1.2 on each substrate. Excess adhesive pushed out of the tile should be removed immediately. 7.3.3 Curing of test assembly 7.3.3.1 Standard cure Cure the assembly for 672 h in standard conditions. 7.3.3.2 Low temperature curing Cure the assembly for 672 h under (5 ± 2) °C conditions. 7.3.4 Treating of test assembly 7.3.4.1 Immersion in warm alkaline water Cure the assembly according to 7.3.3.1 and then immerse in saturated lime water at 60 °C. After 168 h, remove the test pieces from the lime water, rinse with clean water, wipe lightly with a dry cloth and test immediately. 7.3.4.2 Freeze-thaw cycles Cure the assembly according to 7.3.3.1 and then immerse in water (conditioned between 15 °C and 25 °C) for 24 h in order to saturate the mortar substrate with water, before carrying out 200 freeze-thaw cycles. For each freeze-thaw cycle: a) remove the test pieces from the water and maintain the test pieces at (-20 ± 3) °C for 2 h. b) immerse in water at (20 ± 3) °C for 1 h. Repeat the cycle 200 times. Condition the test pieces for a further 24 h under standard conditions. 7.3.4.3 Heat aging Cure the assembly according to 7.3.3.1 and then place them in an air-circulating oven at (80 ± 3) °C for a further 336 h. Remove from the oven and condition the test pieces for a further 24 h under standard conditions. 7.3.5 Adhesive strength 7.3.5.1 Test machine The test machine should be capable of giving breaking tensile force to the test assembly, which should fall between 15 % and 85 % of its force capacity and can stretch the test piece at a rate of 3 mm/mm. 7.3.5.2 Bond the pull head plate Prior to the tensile test, the pull head plate, as shown in Figure 5, is adhered to the test assembly tiles by an epoxy adhesive. 7.3.5.3 Adhesive strength Give the test assembly, made according to 7.3.2. the treatment of 7.3.3 and 7.3.4. and bond the pull head plate to it, as shown in Figure 5. Install this assembly in the tensile tester as shown in Figure 8. using a substrate holder (see Figure 6) and a spacer frame (see Figure 7). Operate the tensile...