2.2
CONCRETE MATERIALS
2.2.1
Cement Mortar
Cement mortar shall conform to ASTM C 270, Type M with Type II cement.
2.2.2
Portland Cement
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NOTE: Type II cement normally will be specified,
but Type V cement will be specified when the soils
contain in excess of 0.2 percent water-soluble
sulfate as SO(4), or the waste water contains in
excess of 1000 parts per million sulfates. Type I
cement may be permitted when it can be assured that
the water soluble sulfates in the soil will be less
than 0.1 percent and the waste water will contain
less than 150 parts per million sulfates over the
design life of the project.
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Portland cement shall conform to ASTM C 150, Type [II] [V] for concrete
used in concrete pipe, concrete pipe fittings, and manholes and type
optional with the Contractor for cement used in concrete cradle, concrete
encasement, and thrust blocking. [Air-entraining admixture conforming to
ASTM C 260 shall be used with Type V cement.] [Where aggregates are alkali
reactive, as determined by Appendix XI of ASTM C 33, a cement containing
less than 0.60 percent alkalies shall be used.]
2.2.3
Portland Cement Concrete
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NOTE: When ready-mix concrete conforming to ASTM C
94/C 94M is not economically available, rewrite this
paragraph to permit use of concrete mixed onsite.
Specify concrete aggregates conforming to ASTM C 33
and concrete consisting of 1 part portland cement,
2-1/2 parts sand, and 5 parts gravel, with just
enough water for workable consistency
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Portland cement concrete shall conform to ASTM C 94/C 94M, compressive
strength of 28 MPa 4000 psi at 28 days, except for concrete cradle and
encasement or concrete blocks for manholes. Concrete used for cradle and
encasement shall have a compressive strength of 17 MPa 2500 psi minimum at
28 days. Concrete in place shall be protected from freezing and moisture
loss for 7 days.
2.3
MISCELLANEOUS MATERIALS
2.3.1
Precast Concrete Manholes and Glass-Fiber-Reinforced Polyester
Manholes
Precast concrete manhole risers, base sections, and tops shall conform to
ASTM C 478M ASTM C 478; base and first riser shall be monolithic.
Glass-Fiber-Reinforced Polyester Manholes shall conform to ASTM D 3753.
SECTION 02531
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