Page 82 - Lecture Notes DCC3113

Dowel and tie bar baskets placed in
preparation for Slip form paving

Slip form pavers

Finishing Slip form pavement around a banked
curve

Figure 5-13: Slip form paver

Work
The slip form paver has certain advantages/disadvantages associated with it:
i. A higher output is achievable as less machinery is involved
ii. It will tend to be less expensive as labour costs will be lower due to the increased level of

automation.
But:
i. Edge slump may occur just after the concrete has left the paver
ii. Greater stockpiles of raw materials such as cement, steel mesh and aggregate are needed in

advance of the operation in order to ensure continued output from the paving train
iii. The contractor operating it may be more vulnerable to weather conditions

iv. A minor quality control failure can cause the entire system to come to a sudden stop.

Compare the methods of paving rigid pavement between manual and mechanical.

Manual Mechanical

Set up side form in certain distance of the pavement Set up side form a long distance of the pavement before
before paving. paving.

Cast the concrete by hand (human labor) Cast the concrete by machine as slip paver and fix pave.

Construction takes a long time Reduce the time of construction period

High labour costs Reduce labour cost

Compacted concrete slab surface use 'Vibrating Compaction and forming operations long-run within the
tamping beam by hand term limits of paving machine

Requires the use wooden or metal side forms that
are set up along the perimeter of the pavement Does not require any steel or wooden forms

before paving

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