e
ga bia e257 E> ox

Wa. Materials.

moh. &t° The forms shall be. Pres from warp and of
eufficiend strength to resist springing out of shape. Wooden
forms shall ‘be of not less than two (2) inch stock.

15. Setting

‘d.. The-forms shall be well staked or other-
“wise held to the established line and grades arid their’ upper
edges’ shall conform to the established grade of the court.

16. Treatment:

ae All wood forms.shall be thoroughly wetted
or oiled and metal forms oiled before depositing any concrete
against them. All mortar -and dirt shall’ be em from forms
that have been previously used.

CONCRETE QUALITY

 

17. Proportioning (Water-Cement Ratio Method)

a.- Concrete shall be mixed with not more than
six (6) U.S. gallons.of water per sack (94 lb. net) of-ce-
ment. Surface water carried by the aggregates must be in-
cluded as part of the mixing water in determining the amount
of water to be added to the batch.

Note: The quantity of mixing water used in each one sack
batch shall not exceed 6 gals. with dry sand and 5
gals. with wet sand. The water should be carefully
measured to secure uniform batches. Limiting the
mixing water to these requirements will insure strong
dense concrete which will resist effects of weather
and will provide a good wearing surface.

b. The coarse aggregate shall be not less
than the amount of fine aggregate nor more than twice the
amount of fine aggregate.

Cc. Fine and coarse aggregates shall be used
with the specified quantities of cement and water in such
proportions to produce concrete that will work readily into
the corners of the forms and around the reinforcement without
excessive puddling or spading and without permitting the

materials to segregate or water to collect on the surface.

18... Mixing
&. The concrete shall be mixed until there is

a uniform distribution of the materials and the mass is homo-
geneous and uniform in colors The mixer shall be of such

ai: Be