EN 14891-2012 pdf download.Liquid-applied water impermeable products for use beneath ceramic tiling bonded with adhesives – Requirements, test methods, evaluation of conformity, classification and designation.
slab and drawn across the slab parallel to that edge, in a straight line. The adhesive between the tiles must not be removed.
A.6.2 Initial tensile adhesion strength
Prepare the test pieces in accordance with A.6. 1.
After 27 days bond the pull head plates to the tiles with a suitable high strength adhesive (e.g. epoxide).
After a total of 28 days storage under standard conditions determine the tensile adhesion strength by applying a force at a constant rate of (250 ± 50) NIs. Before the bond strength is determined, the sample surface shall be cut through to the surface of the concrete slab, around the perimeter of each tile.
Report the results in N.
A.6.3 Tensile adhesion strength after water contact
Prepare the test pieces in accordance with A.6.1. Then, form an upstand, approximately 10 mm high, around the perimeter of the upper surface of the coated slab by applying, for example, a bead of silicone sealant. Condition the test pieces under standard conditions for 7 days.
Fill the reservoir formed by the sealant upstand to about 6 mm depth of water at the standard temperature.
After 20 days, during which time the water level should be maintained at about 6 mm, pour away the water
and wipe the surface of the test piece tiles dry with a cloth, before bonding the pull head plates to the tiles.
After a further 7 h, fill the reservoir with a 6 mm depth of water at the standard temperature once again.
The following day pour away the water and immediately carry out the tensile adhesion test in accordance with
A.6.2.
Report the results in N.
A6.4 Alternative method for tensile adhesion strength after water contact Prepare the surface of the test pieces in accordance with k6.1.
All remaining faces of the slab, including the underside, shall then be sealed with an impervious, waterproof coating material, such as an epoxide or polyester based product, ensuring complete integrity of the coating on all the edges and at the junction with the liquid-applied water impermeable product on the upper face.
Condition the test pieces under standard conditions for 7 days and immerse them in water at the standard temperature.
After 20 days remove the test pieces from the water, wipe with a cloth and bond the pull head plates to the tiles. After a further 7 h immerse the test pieces in water at the standard temperature.
The following day remove the test pieces from water and immediately carry out the Lensile adhesion test in accordance with A.6.2.
A.6.5 Tensile adhesion strength after heat ageing Prepare the test pieces in accordance with A.6. 1.
Condition the test pieces under standard conditions foe’ 14 days and then place them in an air-circulating oven at (70 ± 3) °C for a further 14 days. Remove from the oven and bond the pull head plates to the tiles with a suitable high strength adhesive (e.g. epoxide).
Condition the test pieces for a further 24 h under standard conditions.
Determine the tensile adhesion strength in accordance with A.6.2.
Report the results in Newton.
A.6.6 Tensile adhesion strength after freeze-thaw cycle
Prepare the surface of the test pieces In accordance with A.6.1. In addition, a layer of the adhesive approximately 1 mm thick, shall be applied with a straight edge trowel to the back face of the type Vi tile before placing.
All remaining faces of the slab, Including the underside, shall then be sealed with an Impervious, waterproof coating material, such as an epoxide or polyester based product, ensuring complete integrity of the coating on all the edges and at the junction with the liquid-applied water impermeable product on the upper face.
Condition the test pieces for 7 days under standard conditions, followed by immersing in water for 21 days before carrying out 25 freeze-thaw cycles.
For each freeze-thaw cycle:
1) remove the test pieces from the water and lower the temperature to (-15 ± 3) C within 2 h ± 20 mm;
2) maintain the test pieces at (-15 ± 3) °C for 2 h ± 20 mm;
3) immerse In water at 20°C ± 3 ‘C and raise the temperature to IMi) (15±3) ‘C (iI and maintain this temperature for 2 h ± 20 miii.
Repeat the cycle 25 times, After the last cycle wipe the surface of the tiles with a cloth and bond the pull head plates to the tiles. Allow the test pieces to reach standard conditions for at least 7 h and then determine the tensile strength in accordance with A.6.2.
Report the results in Newton.EN 14891-2012 pdf download.