Section 36 – Cast-In-Place Concrete Pipe (CIPCP)
07/24/01
36.3
Internal
Diameter
Minimum Wall
Thickness
24” through 30”
3”
33” and 36”
3-1/2”
42”
4”
48”
5”
54”
5-1/2”
60”
6”
66”
6-1/2”
72”
7”
78”
7-1/2”
84”
8”
90”
8-1/2”
96”
9”
108”
10”
120”
12”
132”
14”
144”
15”
The compressive strength of the concrete shall be not less than seven hundred pounds per
square inch (700 psi) at one day, not less than fourteen hundred pounds per square inch (1400
psi) at three (3) days, not less than twenty-one hundred pounds per square inch (2100 psi) at
seven (7) days, and not less than thirty-five hundred pounds per square inch (3500 psi) at
twenty-eight (28) days, as determined by moist-cured test cylinders.
36-6 PLACING CONCRETE
Prior to placing any pipe, the Contractor shall secure the Agency’s written approval of the
excavated trench. Concrete placement shall conform to the provisions of Section 51-1.09,
“Placing Concrete”, of the State Specifications. All surfaces against which concrete is to be
placed shall be free from standing water, mud, and debris, and shall be firm enough to prevent
contamination of the concrete by earth or other foreign material. Absorptive surfaces against
which concrete is to be placed shall be moistened thoroughly so that the moisture will not be
drawn from the freshly placed concrete.
An approved method or device shall be used when placing invert concrete to insure that
thickness is maintained at not less than minimum wall thickness at any point. Written approval
of this method or device shall be obtained from the Agency prior to beginning concrete
placement.
The cast-in-place concrete pipe shall be constructed in one placement around the complete
periphery.
The temperature of the concrete when it is being placed shall be not more than 90
°
F and not
less than 40
°
F in moderate weather, or not less than 50
°
F in weather during which the mean



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