|
Concrete in sea water should be impervious to protect the reinforcing steel.
|
|
Mixing water shall not exceed 5 1/2 gal per sack of portland cement. |
|
The mix should contain at least 7 sacks of cement per cubic yard of concrete. |
|
Entrained air should be between 3 and 6 percent. |
|
Aggregates should be verified not to be affected by sea water. |
|
Aggregate size should be limited to less than 1/6 the smallest dimension of the member and never larger than 1 1/ inches. |
| Exceptions to the 1 1/2 inch aggregate size may be made for mass placements. |
|
3 inches of cover should be proveded for reinforcing and 4 inches should be provided at corners. |
| Metal reinforcement chairs should not extend to the surface and if possible should not be used. |
|
Form ties should provide deep recesses with extra care provided when patching. |
|
All attempts should be made to place concrete in a continous operation. |
|
When construction joints are required, the placement shall be allowed to set prior to a new placement. The bonding surface
shall be blasted with a jet of water and sand. Broom cement grout onto the cleaned surface and make the new placement
immediately. |
| High frequency vibrators should be used. |
| Curing is important to establish a watertight paste. The concrete should be kept wet for 10 days at a temperature above 50o F. |
