PART 3 - EXCECUTION
3.01 Manufacturer's Instructions
A. Compliance: Comply with manufacturer's product data regarding installation,
including technical bulletins, product catalogue, installation instructions and
product packaging labels.
3.02 Project Conditions
A. Air Entrainment: For best results, air content of the concrete should not exceed 3% (natural air only). If entrained air content is specified (e.g. for concrete that will be exposed to freeze-thaw cycle), consult with a manufacturer's technical representative for further application information.
B. Water Reducers and Supplementary Cementing Materials: For certain concrete mix designs, we recommend a test panel be produced and evaluated for finishing. For example, higher performance concrete with a low water/ cement ratio, air entrainment, superplasticizers, fly ash or silica fume may reduce bleed water and make the concrete more difficult to finish. Consult with Xypex Technical Services for assistance.
C. Crack Control: All reinforcement shall be in accordance with applicable standards. Concrete elements shall be designed and constructed to minimize and control cracking.
D. Joint Sealants: Suitable flexible sealant or other flexible systems shall be used for expansion joints and chronic moving cracks.
E. Weather Conditions: Environmental conditions (e.g. hot or cold temperatures) may affect the application and installation of the Dry Shake powder. In hot, dry or windy conditions where evaporation of bleed water is occurring, the DS powder should be applied immediately after Step 1 above (i.e. screeding). Keep top of slab from premature drying to ensure homogeneous mixture of DS powder into concrete paste. It is advisable to use an evaporation retardant on the fresh concrete.
A. General: Apply cementitious crystalline waterproofing (dry shake) after placement, consolidation and leveling of fresh concrete.
B. Concentrate DS-1: Wait until concrete can be walked on leaving an indentation of 1/4 - 3/8 in. (6.5 - 9.5 mm). Concrete should be free of bleed water and be able to support the weight of a power trowel, then float open the surface. Immediately after floating open the surface, apply the dry shake material by hand or mechanical spreader. The dry shake material must be spread evenly. As soon as the dry shake material has absorbed moisture from the base slab, it must be floated into the surface. The DS-1 powder must be thoroughly worked into the cement paste using a float (not a trowel). Failure
to utilize a float for this process could result in damage to the hardened surface (i.e. flaking, blistering or peeling). When concrete has hardened sufficiently, power trowel surface to the required finish.
C. Concentrate DS-2: Wait until concrete can be walked on leaving an indentation of 1/4 - 3/8 in. (6.5 - 9.5 mm). Concrete should be free of bleed water and be able to support the weight of a power trowel, then float open the surface. Immediately after floating open the surface, apply one half of the dry shake material by hand or mechanical spreader. The dry shake material must be spread evenly. As soon as the dry shake material has absorbed moisture from the base slab, it must be floated into the surface. The DS-2 powder must be thoroughly worked into the cement paste using a float (not a trowel). Failure to utilize a float for this process could result in damage to the hardened surface (i.e. flaking, blistering or peeling). Immediately after power floating, apply remaining dry shake material at right angles to the first application. Allow remaining dry shake material to absorb moisture from the base slab and then power float the material into the surface. Again, it is essential that the DS-2 powder is thoroughly worked into the cement paste using a float (not a trowel). When concrete has hardened sufficiently, power trowel surface to the required finish.
D. Slab Edges: Where edges of concrete slab set up earlier than main body of
concrete, apply dry shake material to edges and finish with hand tools prior to
proceeding with the dry shake application to the main body of concrete slab.
A. General: Begin curing as soon as concrete has reached a final set but before the
surface starts to dry. Conventional moist curing procedures such as water spray, wet
burlap or plastic covers may be used in accordance with ACI Reference 308,
"Standard Practice for Curing Concrete".
B. Curing Compounds: Curing compounds may be used in the event that project
requirements or conditions prevent moist curing. Curing compounds shall comply
with ASTM C-309.
A. Protection: Protect installed product and finished surfaces from damage during
3.06 Interface with Other Materials
A. Paint, Epoxy, Grout, Thinset, Concrete Topping: Xypex DS-1 treatment of concrete does not adversely affect the bond of subsequently applied materials. After curing allow 21 days for chemical diffusion and then follow surface preparation and other relevant directions of the over coating material’s manufacturer. For Xypex DS-2 contact Xypex Technical Services for assistance.
B. Responsibility to Ensure Compatibility: Xypex Chemical Corporation makes no
representations or warranties regarding compatibility of Xypex treatment with
coatings, plasters, stuccos, tiles or other surface-applied materials. It shall be the
responsibility of the installer of the surface-applied material that is to be applied
over the Xypex waterproofing treatment, to take whatever measures are necessary,
including testing, to ensure acceptance by or adhesion to the waterproofing treatment.
Note: Prior to the installation, it is recommended that a test section be completed under anticipated ambient and project conditions to demonstrate acceptable bond.
3.07 Field Quality Control
A. Examination for Defects: Do not conceal Xypex treated concrete before it has been observed by Architect/Engineer, waterproofing manufacturer's representative or other designated entities. Concrete shall be examined for structural defects such as honeycombing, rock pockets, faulty construction joints, cold joints and cracks larger than 1/64” (0.4 mm). Such defects to be repaired in accordance with manufacturer's Method Statements.
B. Testing for Tanks and Foundation Works
1. Testing: Fill tanks or, for foundation works, shut off dewatering system as soon as practical so that the structure shall be exposed to its normal service conditions. Examine for leaks.
a. Actively leaking cracks and joints shall be left to self-heal for as long as practical. Depending on job site and ambient conditions crack healing can be expected to take several days to weeks.
b. Any crack or joints that do not heal in the allowable time frame shall be repaired.
c. Moving cracks shall be repaired using polyurethane injection or other appropriate method.
3. Repair: Use Xypex repair procedures to seal any static crack or joint that does not self-heal. See Method Statements or contact Xypex Technical Services Representative for appropriate repair procedures.
Note: Lower temperatures will extend the times for crystalline development.
3.08 Cleaning and Protection
A. Cleaning: Clean spillage and soiling from adjacent surfaces using appropriate
cleaning agents and procedures.
B. Protection: Take measures to protect installed product and finished surfaces from
damage after application.
END OF SECTION 033500
Part 1 - General
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| Part 3 - Execution