If a plasticizing admixture conforming to ASTM C 1017/C 1017M is used or if
a Type F or G high range water reducing admixture is permitted to increase
the slump, the concrete shall meet all requirements of paragraph GENERAL
REQUIREMENTS in PART 1. Extreme care shall be used in conveying and
placing the concrete to avoid segregation. Consolidation and finishing
shall meet all requirements of paragraphs Placing Concrete, Finishing
Formed Surfaces, and Finishing Unformed Surfaces. No relaxation of
requirements to accommodate flowable concrete will be permitted.
3.9
JOINTS
**************************************************************************
NOTE: All joints should be indicated on the
drawings. When some of the joints are not shown,
the Designer must edit this paragraph for
conformance with job requirements.
**************************************************************************
Joints shall be located and constructed as indicated or approved. Joints
not indicated on the drawings shall be located and constructed to minimize
the impact on the strength of the structure. In general, such joints shall
be located near the middle of the spans of supported slabs, beams, and
girders unless a beam intersects a girder at this point, in which case the
joint in the girder shall be offset a distance equal to twice the width of
the beam. Joints in walls and columns shall be at the underside of floors,
slabs, beams, or girders and at the tops of footings or floor slabs, unless
otherwise approved. Joints shall be perpendicular to the main
reinforcement. All reinforcement shall be continued across joints; except
that reinforcement or other fixed metal items shall not be continuous
through expansion joints, or through construction or contraction joints in
slabs on grade. Reinforcement shall be 50 mm 2 inches clear from each
joint. Except where otherwise indicated, construction joints between
interior slabs on grade and vertical surfaces shall consist of 1.5 kg per
square meter 30 pound asphalt-saturated felt, extending for the full depth
of the slab. The perimeters of the slabs shall be free of fins, rough
edges, spalling, or other unsightly appearance. Reservoir for sealant for
construction and contraction joints in slabs shall be formed to the
dimensions shown on the drawings by removing snap-out joint-forming
inserts, by sawing sawable inserts, or by sawing to widen the top portion
of sawed joints. Joints to be sealed shall be cleaned and sealed as
indicated and in accordance with Section 07920 JOINT SEALANTS.
3.9.1
Construction Joints
**************************************************************************
NOTE: Drawings must show details for construction
joints, including any required dowels or keyways.
Drawings must indicate whether dowels are
conventional smooth "paving" dowels or "structural"
type deformed dowels (tie-bars).
**************************************************************************
For concrete other than slabs on grade, construction joints shall be
located so that the unit of operation does not exceed [_____] meters feet.
Concrete shall be placed continuously so that each unit is monolithic in
construction. Fresh concrete shall not be placed against adjacent hardened
concrete until it is at least 24 hours old. Construction joints shall be
located as indicated or approved. Where concrete work is interrupted by
weather, end of work shift or other similar type of delay, location and
SECTION 03300A
Page 45
Previous Page
