i:5!t 



after depositing. Any pre-cast members cracked during handling shall lie inspected 

 by the Engineer and if rejected by him shall be rem<)\ed from the work. 



7. Fiiilslii)!'^. Surfaces shall be inspected by the Kngineer when forms are stripped 

 and should any voids, stone pockets or poor joints be discovered, they shall be cut 

 out in such a manner as to form a ke>- and then filled with cement mortar composed 

 of one pari Portland cement to one and one-half ]iarts fine aggregate. 



All surfaces above mean tide level which are exposed to sea water spray shall be 

 gi\ en a priming coat of asphalt cut with distillate and a final coat of hot asphalt of 

 the quality hereinbefori' s]iecihed. 



8. Concreting Under Water. Concrete shall not be deposited in sea water or under 

 the sea water unless authorized by the Engineer. When placed in sea water, concrete 

 shall be discharged through a water tight tremie into jirepared pockets of such capacity 

 that each can be conijileted without interruption of the How of concrete. The tremie 

 pipe shall be of sufficient size to permit the free flow of the plastic concrete, and the 

 arrangement shall be such that the tremie can be readily raised or lowered without 

 interruption of the flow from a hopper or mi.xer until the pocket is completed. The 

 size of pipe, dimensions of pockets and capacity of hojiper and mixer shall be de- 

 termined by the Engineer and will depend upon the depth of water and the size and 

 dimensions of the pockets to be filled. In operating, the top of the tremie pipe shall 

 be plugged with hay or straw to be forced ahead of the charge of concrete. After the 

 charge is started, the flow of concrete into the tremie shall be carried on continuously 

 without interruption luitil the pocket is completed. The lower end of the tremie pipe 

 shall be ke()t embedded in the concrete to such a depth that water cannot be forced 

 back into the pipe through the plastic concrete. 



Tremie concrete shall be proportioned at least one part cement to four parts 



aggregate. The consistency of the concrete shall be mushy so that it will flow readily 



without separation. 



SECTION L) 



Emhkddkd RiiiNFOKCiNG Steel, Structur.vl Steel .\nd Timukk 



1. General. If steel or wood is embedded at more than six inches from the surface, 

 the structure shall be considered of "simple" type and shall not require special treat- 

 ment in the concrete coating. If embedded at less than six inches, the concrete coating 

 shall be considered i)riniarily as a protection requiring special treatment. Concrete 

 in protected composite structures shall be proportioned one part cement to five 

 parts aggregate. 



2. Steel Reinforcemeni. Unless otherwise specified reinforcing bars shall be placed 

 at least three times the bar dimension from any exposed surface and at least five times 

 the bar dimension from adjacent parallel bars. If specified to be placed at less than 

 the above minimum depth and spacing, metal reinforcement in that portion ot the 

 structure above high tide and directly exposed to sea water spray and air shall be 

 galvanized. Spacing from exterior surfaces shall be maintained by wiring to pre-cast 

 mortar blocks approved by the Engineer; interior spacing by wires or steel chairs 

 approved by the Engineer. 



Reinforcing bars shall be bent to the shape and placed in the exact location and 

 with the spaces shown on the drawings or called for in the specifications. Steel shall 

 be cleaned of all mill scale or rust scale before being positioned. All bars unless other- 

 wise noted or shown on the plans shall be continuous. Splices may be introduced only 

 when authorized by the Engineer, who will determine the location and length of lap. 



Reinforcing steel shall be in place in the forms a sufficient length of time before 

 depositing concrete to permit inspection and appro\al by the Engineer. 



