2.9
EPOXY RESIN
All epoxy-resin materials shall be two-component materials conforming to
the requirements of ASTM C 881/C 881M, Class as appropriate for each
application temperature to be encountered, except that in addition, the
materials shall meet the following requirements:
a.
Material for use for embedding dowels and anchor bolts shall be
Type IV, Grade 3.
b.
Material for use as patching materials for complete filling of
spalls and other voids and for use in preparing epoxy resin mortar
shall be Type III, Grade as approved.
c.
Material for use for injecting cracks shall be Type IV, Grade 1.
d.
Material for bonding freshly mixed portland cement concrete or
mortar or freshly mixed epoxy resin concrete or mortar to hardened
concrete shall be Type V, Grade as approved.
2.10
SPECIFIED CONCRETE STRENGTH AND OTHER PROPERTIES
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NOTE: Fill in blanks as appropriate. Specified
strength must be the flexural strength used in the
structural design of the pavement and should not
exceed 650 psi (4.5 MPa) at 90 days of age.
Designer must also ensure that this strength is
attainable with the available aggregates, without
excessive cement content. Air content should be
specified as 6 percent where freezing and thawing is
a concern and 4 percent where it is not a concern.
Specify strength at 90 days. However, modify to
28-days in line 2 if 28-day strength is used in
paragraph, Flexural Strength and Thickness. Be sure
this and succeeding paragraphs correlate.
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2.10.1
Specified Flexural Strength
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NOTE: The designer has the option "Beams" or
"Cylinders/Beams" to specify flexural strength for
concrete.
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Specified flexural strength, R, for concrete is [_____] MPa psi at [28]
[90] days, as determined by tests made in accordance with ASTM C 78 of
beams fabricated and cured in accordance with ASTM C 192/C 192M, as
determined by equivalent flexural strength, as specified in paragraph:
Mixture Proportioning for Flexural Strength. Maximum allowable
water-cementitious material ratio is 0.45. The water-cementitious material
ratio will be the equivalent water-cement ratio as determined by conversion
from the weight ratio of water to cement plus pozzolan, and ground
granulated blast furnace slag by the mass equivalency method described in
ACI 211.1. The concrete shall be air-entrained with a total air content of
[_____] plus or minus 1.5 percentage points, at the point of placement.
Air content shall be determined in accordance with ASTM C 231. The maximum
allowable slump of the concrete at the point of placement shall be 50 mm 2
SECTION 02753
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