Section 36 – Cast-In-Place Concrete Pipe (CIPCP)
07/24/01
36.2
36-4 SPECIAL FOUNDATION TREATMENT
Whenever the bottom of the trench is soft, rocky or in the opinion of the Agency otherwise
unsuitable as a foundation for the pipe, the unsuitable material shall be removed to a depth
such that when replaced with a suitable material, it will provide a stable and satisfactory
foundation. Suitable materials for backfilling the trench below the pipe shall consist of select
material approved by the Agency compacted to a relative compaction of not less than ninety
percent (90%). Alternate backfill materials and methods may be used with the approval of the
Agency.
36-5 CONCRETE
Concrete shall be Class “A-1” portland cement concrete conforming to Section 50-5,
“Portland Cement Concrete”, and these Specifications.
The maximum aggregate size shall be determined by the size of cast-in-place concrete pipe
constructed, and shall be as follows:
Pipe Size Maximum Aggregate
48” or less
1”
Over 48”
1-1/2”
Gradation for combined aggregates shall conform to Section 90-3.04, “Combined Aggregate
Gradings”, of the State Specifications.
Slump shall not exceed two inches (2”) as determined by the slump cone method of ASTM
Designation: C 143 or an equivalent slump as determined by California Test Method 533, unless
otherwise permitted or directed by the Agency.
The minimum wall thicknesses for the various sizes of pipe shall conform to the following
table:



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