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南非土木工程施工标准 MG:沥青表面处理 英文原文节选 20100079 1-37 |
4.5 Brooms
4.5.1 Drag broom
Each drag broom shall be of a size, type and mass that will enable the stone chips to be distributed evenly over the
surface without dislodging stone chips from the binder.
4.5.2 Rotary broom
Each rotary broom shall be of an approved type and shall be available on the Site at all times during surfacing work.
4.6 Mixer for slurry seal
A mixer of an approved type shall be provided for the mixing of slurry seal. The mixer, whether it is a batch mixer
or a continuous mixer, shall be of such capacity that the programmed output is achieved and shall be equipped with
mass or volume measuring devices capable of controlling, with acceptable accuracy, the proportions of each
constituent of the mix. The paddles of the mixer shall be so designed as to ensure complete blending of the
constituents of the slurry.
4.7
Where a spreader box is used, it shall be so constructed that its weight is distributed on metal skids in such a way
that no damage is done to the surface when the box is in operation.
Rubber belting shall be attached to the framework in such a way that no spillage of slurry occurs past the sides of the
spreader box when the box is in operation.
The spreader box shall be capable of spreading a uniform application of slurry seal at the specified rates over a width
that is adjustable from 2,4 m to 4,O m, and it shall have efficient mechanical means of adjusting the rates and widths
of application to those specified.
4.8 Pre-coating plant
Pre-coating of stone chips may be done in any suitable plant capable of uniformly coating the stone chips.
4.9 Miscellaneous equipment
Sufficient equipment for loading, handling and hauling aggregate and binder shall be provided by the Contractor to
ensure prompt and continuous covering of bituminous material as specified. The Contractor shall have available on
the Site all the ancillary equipment and hand tools, thermometers, etc., necessary to carry out the work efficiently.
Spreader box for slurry seal
5 Construction
5.1 General requirements
5.1.1 Preparation of base
The base shall be thoroughly swept with mechanically driven brooms until all loose soil binder and foreign materials
have been removed and the top surface of the stones have been exposed. Any superficial film of soil binder that might
have formed on the surface during watering and rolling shall be removed completely.
Where the bituminous surfacing is to abut against kerbs, channels or manhole frames, the vertical face of each such
kerb, channel and frame shall be cleaned.
5.1.2 Demarcation of the work area
The Contractor shall demarcate the area to be sprayed.
5.1.3 Protection of kerbs, channels, etc
Kerbs, channels, manholes, etc., shall be protected from the spray or slurry application. Any kerbs, channels,
manholes, etc., on which binder or slurry is sprayed or splashed or which are damaged shall be thoroughly cleaned
or replaced (as appropriate) by the Contractor at his own expense and to the satisfaction of the Engineer.
5.1.4
In order to prevent overlapping at junctions of separate bituminous binder applications, the previous work shall be
covered in an approved manner at the joint and for a distance back from the joint sufficient to ensure that the sprayer
is operating at the required rate before the untreated surface is reached, and to prevent the application of additional
binder to the previously treated section. The same method shall be used to ensure a neat joint at the end of each
run.
Transverse joints between bituminous binder sprays
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