EN 14068-2003 pdf download.Products and systems for the protection and repair of concrete structures — Test methods — Determination of watertightness of injected cracks without movement in concrete.
— a disc 170 mm in diameter and 10 mm thickness:
two segments 170 mm in diameter, 70 mm in height and 10 mm thickness.
— a bar 10 mm thickness to hold the specimen in place;
— an elastic packer, shore – A hardness 40° between the upper surface of the specimen and the bar.
5.2 Supply of adjustable pressure tap water, with pressure measuring device, capable of being maintained to
within ± 10 % of the specified value.
5.3 Diamond saw to cut specimens.
5.4 Compression cylinders testing machine, for splitting concrete.
5.5 Injection equipment, including mixer, pressure pot or injection pump, injection nipples or packers.
5.6 Caulking or sealing compound to seal the crack along the height and across the base of the cylindrical test samples. according to the instructions of the manufacturer.
5.7 Elastomeric bitumen or other suitable material, to provide sealing of the test sample in the apparatus for applying water pressure.
6 Specimen preparation
The test shall be performed on three specimens, prepared as follows:
6.1 The concrete specimen shall be cylindrical with a diameter of (150 ± 2) mm and (100 ± 2) mm in height and cut by sawing from concrete cylinders 150 mm in diameter cast from a reference concrete type MC (0.45) as defined in EN 1766.
6.2 The concrete specimen shall be split along the axis, according to EN 123906.
6.3 The two pieces shall be held together in such a way that a crack width of (1 ± 0.2) mm is obtained by using inert flexible plastic spacers; the crack openings along the height shall be entirely sealed by using caulking or sealing compound (5.6). The caulking compound shall not penetrate into the crack by more than 5 mm.
6.4 The concrete specimen shall be inserted into the apparatus described in 5.1 on the polymeric disc.
6.5 Hot elastomeric bitumen (5.7) or other suitable material is poured between the mould and the concrete specimen, taking care not to contaminate the upper circular surface.
7.1 Test conditions
The standard climate conditions during the test shall be (21 ± 2) °C and (60 ± 10) % relative humidity, for conditioning before injection, injection prncess. specimen curing and pressure test.
The assembly shall be stored at these conditions for (4.8 ± 4) h prior to testing.
7.2 Crack conditioning
The bottom plate and the polypropylene disc (5.1) shall be removed. If it is not required to inject against a head of water (see below), the crack at the lower side shall be sealed by using caulking compound (5.6). The caulking compound shall cover the crack and an area immediately adjacent to the crack to a width less than 15 mm to either side of the crack.
Two polymeric segments (5.1) shall be put on the lower side of the specimen, on each size of the caulking compound strip, and the bottom plate shall be fixed again.
If testing for injection against a head of water is required, the lower side of the crack shall not be sealed.
Two polymeric segments (5.1) shall be put on the lower side of the specimen so that the crack is not covered.
Connection to a water supply at the agreed water pressure shall be made via the water inlet.
Depending upon the classification of humidity specified by the manufacturer of the injection material, the specimen shall be conditioned as follows:
— for injection into a dry crack: no further conditioning required:
— for injection into a damp crack: the crack shall be kept filled with tap water at (21 ± 2) °C for 30 mm, then emptied and allowed to drain for 30 mm before proceeding with injection;
— for injection into a wet crack: soak crack as above, but proceed with injection immediately after emptying without any period of draining:
for injection into a water filled crack: fill the crack with water at (21 ± 2) °C for 30 mm as above. Then proceed with injection without emptying the water;
— if testing for injection against a head of water is required, the lower side of the crack shall not be sealed and connection to a water supply at the agreed water pressure shall be made via the water inlet.
7.3 Injection
The crack opening on the upper surface of the specimen shall be prepared for injection according to the manufacturer’s recommended procedure appropriate for the selected crack condition (7.2). This may include the fitting of injection nipples or packers and vents as inlet and outlet ports;EN 14068-2003 pdf download.