chapter 3 rigid pavement - DOT On-Line Publications - Department ...

Tranavoraa Stool -
SIDE VIEW
Longltudlnal Stool Spacing
l-c 21
FHWA TECHNICAL ADVISORY T 5080.14
June 5, 1990
Tranamrm Steel
FRONT VIEW
TOP VIEW
r bngltudinal Stool
Note: Chalrs should be securely fastened the base.
FIGURE 3 - Combination Chair and Transverse Steel Detail
C. Procedures should be implemented to ensure a uniform base and
subgrade. Soft spots or gradeline variations should be
repaired and corrected prior to concrete placement. Emphasis
should be placed on batching, mixing, and placing concrete to
obtain uniformity and quality. Strict inspection of batching
and mixing procedures is extremely important and may require
rejection of batches because of deviations that may have been
considered minor under previously existing practices. When
placing concrete, adequate vibration and consolidation must be
achieved. This is especially critical in areas of pavement
discontinuity such as construction or terminal joints.
Automatic vibrators should be checked regularly to ensure
operation at the specified frequency and amplitude and at the
proper location in the plastic concrete. Hand-held vibrators
should be used adjacent to transverse joints. Any concrete
which exhibits signs of aggregate segregation should be
replaced immediately.
d. Inspection procedures are needed to ensure that final
reinforcing splice lengths and patterns, as well as bar
placement, are consistent with the design requirements.
Special precautions should be taken to prevent rebar bending
and displacement at construction joints. When leave-outs are
necessary, they should be constructed in absolute conformity to
3.6.11