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

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451.07
finishing the freshly placed concrete. Provide the Engineer documentation that the
slipform paver will meet this specification.
Do not mix, place, or finish concrete after dark without operating an adequate
and approved lighting system.
When the air temperature is 35 °F (2 °C) or below, assure the concrete has a
temperature of between 50 and 80 °F (10 and 27 °C) at the point of placement.
When the air temperature is greater than 35 °F (2 °C) before placing, maintain a
concrete temperature of not more than 90 °F (32 °C).
Do not place concrete on any surface that is frozen or has frost.
Make two test beams from each 7500 square yards (6300 m 2 ) of concrete or
fraction thereof incorporated in the work each day.
451.07 Placing Reinforcement. Place pavement mesh of the size and at the
locations within the concrete slab shown on the standard construction drawings.
When placing reinforced concrete pavement in two layers, strike off the entire
width of the bottom layer to a length and depth that allows laying the mat of
reinforcement on the concrete and in its final position without further
manipulation. After installing reinforcement directly upon the concrete, place,
strike off, and screed the top layer of concrete. When reinforced concrete
pavement is placed in one layer and in advance of placing concrete, position and
securely anchor the reinforcement to the underlying base or pavement. As an
alternative, after spreading the concrete and while it is in a plastic condition, use
mechanical or vibratory means to place reinforcement in the concrete.
Where reinforcement is overlapped, securely fasten mats of reinforcement
together at the edges of the sheets and at two additional points along the lap. Use
reinforcing steel free from dirt, oil, paint, and grease.
451.08 Joints. Unless otherwise directed, construct all transverse joints normal
to the centerline of the pavement lane and of the type, dimensions, and at locations
specified.
Determine contraction and longitudinal joint sawing time limits to protect the
concrete from early cracking by using HIPERPAV software. Obtain the software
according to Supplement 1033.
Twenty four (24) hours before placing concrete pavement create a HIPERPAV
project date file according to Supplement 1033.
Provide the completed file and the printout to the Engineer. When HIPERPAV
predicts early age slab cracking will occur, whether due to standard construction
practices, joint sawing methods, mix design or curing, either do not start
construction until modifications have been made to eliminate HIPERPAV’s
predicted slab cracking or do not pave.
Perform a HIPERPAV analysis for each pour.
If software analysis determines joint sawing could exceed twenty four (24)
hours, assure all joints are sawed by the 24th hour.