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©
Canadian Standards Association
Precast concrete — Materials and construction
November 2009
33.3.4 Drypacking
Drypacking shall be used for deep holes or any hole that has a relatively high ratio of depth to area.
Drypack (approximately 1 part of cement to 2.5 parts of sand passing a 1.25 mm sieve) shall have the
correct amount of water to make a sound, solid pack. It shall be placed in layers having a compacted
thickness of about 10 mm. Each layer shall be compacted with a tool (hardwood stick) that will not
produce too smooth a surface for proper bonding of successive layers.
33.3.5 Pressure grouting
Pressure grouting shall comply with the requirements for the grouting of post-tensioning ducts in
CSA A23.1.
33.3.6 Epoxy injection
Injection of a low-viscosity epoxy under pressure or by vacuum shall be performed by personnel skilled in
working safely with epoxies. For treatment other than treatment of horizontal surfaces, cracks shall be
sealed, except for entry and vent points, and care shall be taken not to trap air pockets.
Note:
It can be necessary to examine concrete cores to verify structural bond.
33.3.7 Load test
If a load test is required following repairs, it shall be performed in accordance with Clause 20 of
CAN/CSA-A23.3.
Licensed for/Autorisé à Jed Friesen Sold by/vendu par CSA on/le June/18/2015.
~Single user license only. Storage, distribution or use on network prohibited. Permis d'utilisateur simple seulement.
Le stockage, la distribution ou l'utilisation sur le réseau est interdit.