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Section 36 – Cast-In-Place Concrete Pipe (CIPCP)

96” through 108”

The finished surface of the concrete pipe shall be substantially free of fractures, cracks and

interior surface roughness.

The Contractor shall hand trowel the bottom ninety degrees (90°) of the inside of the pipe

unless alternate provisions are made to provide a smooth interior surface satisfactory to the

Agency. The remaining interior surface of the pipe not covered by forms shall be equivalent to a

steel screeded finish. All extraneous concrete shall be removed from the interior surface as

soon as possible after placing. Any additional finish work or repair work required to be done on

the pipe shall be completed within five (5) days after the pipe is placed.

If obvious segregation or honeycombing or inadequate wall thickness is found by the

Agency, the pipe may be rejected.

Forms shall be strong enough to permit the placement and vibrating of the concrete without

causing distortion at any point. Form support systems shall be constructed so that previously

placed concrete will not be damaged. Form structure bearing plate indentations shall not

exceed one-eighth inch (1/8”) and care shall be taken when removing the forms to prevent

damage to the pipe. After removal of the forms, the inside of the pipe will be inspected by the

Agency and any repairs made promptly by the Contractor, at the Contractor’s expense.

The surfaces of the forms against which concrete is to be placed shall be cleaned of all dirt,

mortar, and foreign material. Forms shall be thoroughly coated with form oil prior to use. The

form oil shall be a commercial quality form oil or other equivalent coating that will permit the

ready release of the forms.

Immediately after finishing exposed exterior surfaces, the curing of these surfaces shall be

undertaken by any one or a combination of the following methods:

Pigmented curing compound, blanketing, cotton mat, polyethylene film or spraying

methods as specified in Section 90-7.01, “Methods of Curing”, of the State

A six-inch layer of moist earth backfilled over the pipe. Care shall be taken to avoid

damage to the fresh concrete while placing the backfill. This backfill shall be kept

moist for not less than seven (7) days.

During the curing period, the ends of the pipeline shall be securely closed with heavy

canvas, or by other methods approved by the Agency, to maintain a humid condition within the

pipe for a minimum of seven (7) days, except during periods when repair work is actually in

progress on the inside of the pipe.