This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1920 Excerpt: ...for sea water work should be mixed in the
proportions of one part Portland Cement to not more than six parts
of fine and coarse aggregates, measured separately and combined in
such proportions as will produce a concrete of maximum density and
impermeability. Only enough water should be added to secure plastic
workability. The concrete shall be mixed in a batch mixer for not
less than two minutes after all the materials are in the drum.
Where concrete is deposited into sea water, the above proportions
should be reduced to one part of cement to not more than five parts
of separately measured aggregates. Tests should be made from time
to time during the progress of the work to maintain the proper
proportions of the aggregates throughout construction. 2. Concrete
should be deposited in the air wherever practicable. When necessary
to deposit concrete in water, it should be protected from currents
by cofferdams or similar means. 3. The concrete, where practicable,
should be deposited in a continuous operation to a point 5 ft.
above high water. In case of unavoidable stoppage of the work, the
previously cast concrete should be thoroughly cleaned of all
laitance. 4. From 2 ft. below low water to 2 ft. above high water,
or from a plane below to a plane above wave action, the face of the
concrete should be adequately protected against mechanical abrasion
and frost action. Construction or other joints should in every case
be avoided within this zone. Sharp corners and projections should
also be avoided, but where necessary they should be rounded to
reduce abrasion to a minimum. 5. If reinforcement is used in
concrete in sea water, special attention should be given in the
design to the position of the reinforcement. In no case should the
steel be nearer than 3 in. to a...
|Country of origin:
American Railway Association
||246 x 189 x 18mm (L x W x T)
||Paperback - Trade
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