TranSystems Corporation - LGM Construction

501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11
2. Installation:
permanently in place. The “chair” portion of the assembly shall be sloped at the thickened
edges and shall be delivered pre-manufactured with a slope designed to keep the dowel
bars at a uniform depth from the top of the slab. The dowel or load-transfer and joint
devices shall be rigid enough to permit complete assembly as a unit ready to be lifted and
placed into position. A metal, or other type, dowel expansion cap or sleeve shall be
furnished for each dowel bar used with expansion joints. These caps shall be substantial
enough to prevent collapse and shall be placed on the ends of the dowels as shown on the
plans. The caps or sleeves shall fit the dowel bar tightly and the closed end shall be
watertight. The portion of each dowel painted with rust preventive paint, as required in this
specification, shall be thoroughly coated with asphalt MC-70, or an approved lubricant, to
prevent the concrete from binding to that portion of the dowel. If free-sliding plastic-coated
or steel dowels are used, a lubrication bond breaker shall be used except when approved
pullout tests indicate it is not necessary.
a. The top of an assembled joint device shall be set at the proper distance below the
pavement surface and the elevation shall be checked. Such devices shall be set to the
required position and line and shall be securely held in place by stakes or other means
during the pouring and finishing of the concrete. The premolded joint material shall be
placed and held in a vertical position; if constructed in sections, there shall be no offsets
between adjacent units. Dowel bars shall be checked for exact position and alignment as
soon as the joint device is staked in place, and the device shall be tested to determine
whether it is firmly supported. The maximum permissible tolerance on dowel bar alignment
in each plane, horizontal and vertical, shall not exceed 2 percent or ¼ inch (6mm) per foot
of a dowel bar. The most effective way to obtain proper alignment is with well-fabricated
dowel baskets and dowel assemblies.
b. All joints in concrete pavements shall be sawed and beveled; the joints shall be cut as
shown on the plans. Equipment shall be as described in this specification. The circular
cutter shall be capable of cutting a groove in a straight line and shall produce a slot at least
1/8 inch wide and to the depth shown on the plans. When shown on the plans or required
by the specifications, the top portion of the slot or groove shall be widened by means of a
second shallower cut to provide adequate space for joint sealers. When shown on the plans
or required by the specifications, the top portion of the joint shall be beveled by a third cut.
Sawing of the joints shall commence as soon as the concrete has hardened sufficiently to
permit cutting without chipping, spalling, or tearing. Sawing shall be carried on both during
the day and night as required. The joints shall be sawed at the required spacing
consecutively in sequence of the concrete placement, unless otherwise approved by the
Engineer.
3. Longitudinal Joints:
a. Construction: Longitudinal construction joints necessary for lane construction shall be
formed against suitable side forms (made of steel) without keyways, as indicated in the
plans. When the concrete is placed using slip-form pavers, dowels or tie bars shall be as
shown on the drawings. Where butt-type joints with dowels are designated, the dowels for
this type shall be painted and greased. The edges of the joint shall be finished with a
grooving tool or edging tool. Construction joints shall be sawed to provide a groove at the
top conforming to the details and dimensions indicated on the plans. Provisions shall be
made for the installation of tie bars as noted on the plans. Dowels or tie bars shall be
installed in a manner that does not damage the concrete. Dowels or tie bars shall be
CEMENT CONCRETE PAVEMENT 02751 - 8