chapter 3 rigid pavement - DOT On-Line Publications - Department ...
chapter 3 rigid pavement - DOT On-Line Publications - Department ...
chapter 3 rigid pavement - DOT On-Line Publications - Department ...
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SUMMARY AND CONCLUSIONS<br />
With any new form of technology, there will always be some<br />
problems that need to be resolved during the initial learning<br />
period. The dowel bar inserter is no exception to this rule, and<br />
several problems have been identified with its performance on the<br />
projects in this study. However, none of these problems appear<br />
to be insurmountable. Through the continued cooperative efforts<br />
of Wis<strong>DOT</strong> construction personnel and the contractors, it should<br />
be possible to improve construction procedures to obtain<br />
consistent satisfactory results with the dowel bar inserter.<br />
The primary general recommendation of this study is to accept the<br />
dowel bar inserter as an equal alternate to dowel baskets for<br />
future Wis<strong>DOT</strong> doweled PCC construction projects. The following<br />
list of specific conclusions and recommendations are based on the<br />
results of this study.<br />
1.<br />
2.<br />
3.<br />
4.<br />
5.<br />
6.<br />
7.<br />
The dowel bar inserter is capable of consistent satisfactory<br />
placement of dowel bars with respect to vertical translation<br />
-(average depth), vertical rotation (difference in depth<br />
between two ends of dowel), and horizontal rotation<br />
(difference in transverse position between two ends of<br />
dowel).<br />
The initial set-up of the dowel bar inserter with respect<br />
depth of dowel placement is critical at the start of each<br />
project, and dowel depths should be verified by probing<br />
through the fresh concrete.<br />
The construction procedures currently used for marking and<br />
sawing joints need improvement both for inserter and basket<br />
projects, to consistently and accurately align the sawn<br />
joints with the midpoints of the dowel bars.<br />
Having a magnetic rebar locator available on all doweled PCC<br />
construction projects would be useful in aligning sawn<br />
joints with the dowel bars and in identifying missing<br />
dowels.<br />
Ride quality has improved on each successive inserter<br />
project, and on the latest project, the South Madison<br />
Beltline, a project PSI of 4.6 was achieved with minimal<br />
diamond grinding.<br />
Improved concrete consolidation around the dowels is needed<br />
both on inserter and basket projects, and quality control<br />
coring is needed to assess future progress in solving the<br />
problem of voids around the dowel bars.<br />
Problems with missing dowel bars on existing inserter<br />
projects appear to be infrequent and isolated, but this<br />
problem should be monitored on future projects.<br />
3.5.18<br />
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