2010 Construction and Material Specifications - Ohio Department of ...

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511.16
from 50 to 100 °F (10 to 38 °C). The Contractor may stop using heated water after
48 hours if the concrete remains flooded to a depth of 1 foot (0.3 m) above its
highest elevation for at least the next 120 hours.
511.16 Removal of Forms. To facilitate finishing, remove forms from vertical
surfaces that receive a rubbed surface finish as soon as the concrete has hardened
sufficiently that rubbing will not damage it.
511.17 Curing and Loading. Remove falsework and open structures to traffic
after the concrete has cured for the time specified by Table 511.17-1.
Removing
Falsework
TABLE 511.17-1
Age of Concrete in Days
Span[1]
No Beam Beam Test [2]
Over 10 feet (3 m) Test 14 5
10 feet (3 m) or less and all pier caps 7 3
Traffic [3] Any 14 7
[1] Span is defined as the horizontal distance between faces of the supporting elements
when measured parallel to the primary reinforcement.
[2] Applicable only when the average modulus of rupture for two tests is not less than 650
psi (4.5 MPa).
[3] When placing Class HP concrete for a superstructure between October 15 and March
15, open the deck to traffic no sooner than 30 days after placement.
If the air temperature surrounding the concrete is maintained between 32 and 50
°F (0 and 10 °C), and if the provisions of 511.15 do not apply, maintain the
concrete above 32 °F (0 °C) for 7 days or until a successful beam test, except this
time shall not be less than 5 days.
If a beam test is not performed, maintain the air temperature surrounding the
concrete above 50 °F (10 °C) for 7 days. Extend the 7-day period and the times for
removing falsework and opening to traffic one hour for each hour the temperature
of the air surrounding the concrete is below 50 °F (10 °C) and until the concrete
has experienced 7 days, or 168 hours, of temperature above 50 °F (10 °C). Cure
concrete as follows:
Location Curing Method [1]
Superstructure concrete Method A
Concrete to which sealer is applied Method A
Construction joints Method A
Top surface of Class HP concrete deck
superstructure concrete
Method A followed by Method B
Concrete with waterproofing Method A or Method B
All other concrete Method A or Method B
[1] Method A is water curing. Method B is membrane curing. If using Method B on areas to
be waterproofed, remove the curing membrane.
Do not install compression rings on pier columns or similar items of
construction for supporting falsework or subsequent construction until after a 72hour
curing period.