4. It may be necessary to modify chemical
requirements for cement under certain conditions.
Sulfate resistance is required for concrete pipe
when pipe is carrying sulfate-bearing waters, or
when pipe is buried in soil containing sulfates.
Specify Type II (moderate sulfate resisting) cement
when water-soluble sulfates (as S04) in the soil are
in the range of 0.1 to 0.2 percent and, for water,
are in the range of 150 to 1000 parts per million.
Specify Type V (sulfate resisting) cement when soils
contain in excess of 0.2 percent water-soluble
sulfate and water samples contain in excess of 1000
parts per million. In areas where reactive
aggregates are known to occur, specify low alkali
cement.
On the project drawings, show:
1. Plan and location of new pipelines, including
type of service and size of pipe
2. Location, size, and type of service of existing
connecting, intersecting, or adjacent pipelines and
other utilities
3. Paved areas and railroads which pass over new
pipelines
4. Profile, where necessary to show unusual
conditions
5. Invert elevations at beginning and end of
pipelines and at manholes or similar structures
6. Class or strength of pipe and limits for same
where class or strength will be different for
different sections of pipeline
7. Design details for pertinent manholes, septic
tank(s), and sewage absorption trench
8. Bedding conditions, where different from those
specified in the appropriate specification and
location of cradle(s), when cradle is required, if
not covered
9.
Maximum working pressure for pressure sewers
10. Location and size of thrust blocks on pressure
lines
11.
Location of flanged joints on pressure sewers
12. Location of mechanical joints on ductile-iron
piping (when used on only part of the system).
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SECTION 02531
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