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Section 50 – Construction Materials

dropping the oldest. If the five (5)-determination average at any time falls below

eighty percent (80%), the produced pipe shall be unacceptable on each day that

the determination was below eighty percent (80%) but will be subject to

acceptance by retesting. Similarly, if any single determination falls below

seventy-seven percent (77%), regardless of the five (5)-determination average,

the pipe produced on that day shall be unacceptable, subject to acceptance by

retesting. The individual acceptance rules must be independently fulfilled.

Rejection of pipe for any reason does not eliminate it from its proper inclusion in

calculating each five (5)-determination average.

When any lot of pipe is declared unacceptable, the Contractor may cull the pipe,

eliminating those sections the Contractor does not want to include as part of the

Contract and suitably labeling them so that they will not be shipped to the job. Of

the remainder, the Agency shall select three (3) representative sections from the

pipe produced each day. The Contractor shall core drill a hole approximately two

inches (2”) in diameter through the interior wall to the depth of reinforcing of each

selected section. These cores shall be crushed and tested for their calcium

carbonate equivalent as specified. If the determinations on the three (3) cores

representing one day's production average eighty percent (80%) or higher, the

pipe produced on that day will be considered acceptable in respect to calcium

carbonate equivalent; otherwise it will be considered unacceptable.

Hydrostatic Test - Hydrostatic tests on the pipe units shall be made by applying

suitable bulkheads at each end of the pipe and filling the pipe with water. At the

Contractor's option, the pipe may be soaked under a reduced pressure for a

period of time not to exceed forty-eight (48) hours prior to testing.

Acceptance hydrostatic tests shall be made at fifteen pounds per square inch (15

psi) internal pressure. The pipe shall withstand the test pressure prescribed

above for at least twenty (20) minutes without cracking and with no leakage

appearing on the exterior surface. Moisture appearing on the surface of the pipe

in the form of damp spots or beads adhering to the surface will not be considered

as leakage. Slow forming beads of water that result in minor dripping which seal

and dry up upon retesting of the individual pipe unit under the prescribed test

pressure will be considered acceptable. At the Contractor's option, the pipe may

be soaked under a reduced pressure prior to retesting. The maximum length of

soaking after the initial test shall be ninety-six (96) hours.

Bond Test - Take one (1) one and one-half inch (1-1/2”) core from near each end

of the pipe and split the cores on the plane of the reinforcement steel. The

Agency will make a visual judgment of the percent bond between the concrete

and steel. A minimum of eighty-five percent (85%) bond for each cage shall be

obtained. If any one core has less than eighty-five percent (85%) bond, two (2)

additional pipes from the lot shall be tested as described. If the steel of any one

of these cores has less than eighty-five percent (85%) bond, the entire lot will be

Section 14, Repairs:

Delete entire section and replace with:

Repairs shall be made in accordance with U.S. Bureau of Reclamation Concrete

Manual, Eighth Edition, Chapter VII, Section 138, to insure the interior surface of

the pipe shall be free from honeycombing or roughness and presents a finished,

smooth, uniform, continuous surface.