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

36-12 FIELD QUALITY CONTROL

36-12.01 Placement Tests

The Agency will be present for testing and inspection at all times during construction of a

cast-in-place concrete pipe. No cast-in-place concrete pipe may be constructed without the

presence of the Agency.

A slump test of each truckload of concrete will be made by the Agency before the concrete

will be permitted to be placed in the pipe casting machine.

Any concrete having a slump that exceeds the specified slump by more than one-half inch

(1/2”) will be rejected. At least three (3) compressive test cylinders will be cast from

representative portions of each load of concrete. Each cylinder shall have recorded the line,

station number, date and batch ticket number. Compression tests will be made at the Agency’s

expense. Concrete compressive strength shall be determined from six-inch by twelve-inch (6” x

12”) cylinders conforming to ASTM Designation: C 31, tested in conformance with ASTM

One (1) cylinder of each set will be tested after curing for two (2) days and seven (7) days,

at the option of the Agency. The other cylinder of the set will be held for testing in the event that

the Agency wishes to retest any batch.

If more than two (2) cylinders tested in any day’s concrete placement fall more than ten

percent (10%) below the minimum specified compressive strength, cores will be taken from the

pipe and tested for compressive strength at the expense of the Contractor. If cores indicate

concrete strength more than twenty percent (20%) below the minimum specified compressive

strength, that portion of pipe shall be removed and replaced with precast concrete pipe, at the

expense of the Contractor.

36-12.02 Crack Repair

After completion of entire backfill and compaction, all cracks shall be repaired as follows:

Crack width shall be determined by penetration to more than 0.25 inch (6.4mm) of a standard

machinist gage leaf defined in AASHTO T 280.

Where the pipe function requires repair, circumferential cracks greater than 0.01 inch

(0.3mm) and less than 0.06 inches (1.5mm) in width shall be cleaned and filled with mortar.

Circumferential cracks 0.06 inches or more in width shall be cleaned and filled to a depth of

0.38 inches (9.5mm) with an elastomeric sealant.

Longitudinal cracks with a width of more than 0.01 inches (0.3mm) and a length less less

than that determined by the formula 0.0005 times the outside pipe diameter shall be cleaned

and filled to a depth of 0.38 inches (9.5mm) with an elastomeric sealant.

Longitudinal cracks having displacement greater than 0.08 inches (2.0mm) or width greater

than that determined by the formula 0.0005 times the outside pipe diameter shall be repaired by

full depth epoxy pressure grouting.

36-13 REIMBURSEMENT FOR FIELD QUALITY CONTROL

The Agency has determined that there is an additional cost to the Agency for field quality

control of cast-in-place concrete pipe over and above that required for other types of

underground construction. This additional cost is fixed at the amount specified in the Special

Provisions and shall be reimbursed to the Agency in order that bids received for various pipe

materials and methods of construction will be comparable in total cost. Reimbursement will be

deducted from the prices paid per linear foot for each size of cast-in-place concrete pipe.

Initial backfill shall be the material placed between the top of the pipe shoulder in contact

with the trench and a point twelve inches (12”) above the top of the pipe. Initial backfill selected