Specification Part 3 - Road & Bridge Works - Urban Administration ...

compacted by 80 to 100 kN smooth wheel roller, vibratory roller, hand roller, plate vibrator or hand
rammer to obtain atleast 94 per cent of the maximum dry density in accordance with IS : 2720 (Part 8).
The finished surface shall have the specified cross slope and line in accordance with the drawing. The
side slopes shall be trimmed to the required slope with the help of grader or manual methods using
hand tools.
Wherever the earth is required to be excavated from the shoulder, this shall be done either
using equipment like grader or by manual means using hand tools. The resulting surface shall be
uniform and have a field density of atleast 94 per cent of maximum density obtained in accordance with
IS : 2720 (Pan 8). 5f the surface is not uniformly compacted, it shall be excavated to a depth of 150 mm
and the soil mixed with water if required and compacted at a moisture content close to the optimum to
achieve 94 per cent of maximum density as stated above.
3003.4. Measurements for Payment
Maintenance of earthen shoulder shall be measured in sq. metres.
3003.5. Rate
The Contract unit rate for maintenance of earthen shoulder shall be payment in full
compensation for:
(i) furnishing earth required for making up of shoulders including all leads and lifts, cost of
land and compaction;
(ii) excavation of earth as required and disposal of the earth at the location approved; and
(iii) all tools, equipments and incidentals to complete the work in accordance with the above
Specification.
3004. BITUMINOUS WORK IN CONNECTION WITH MAINTENANCE AND REPAIRS
3004.1. Filling Pot-holes and Patch Repairs
3004.1.1. Scope : This work shall include repair of pot-holes and patching of all types of bituminous
surfaces with a bituminous mix either produced at plant site or at the site itself with manual method of
mixing and placed at site in the pot holes or in patches after trimming the pot-hole or depression to
proper shape and depth, side painting with tack coat and compacting the layer to the levels specified in
the drawing.
3004.1.2. Materials : The materials used for the pot-hole and patch repair of bituminous surface shall be
as per the Contract and shall be of the same type as used for the existing bituminous surface, A mix
superior to the one on existing surface can also be considered appropriate for repair work.
An emulsified bitumen mix compatible with the existing layer shall also be considered
appropriate.
The grading of aggregates and bitumen content of the mix used for such patch repair shall be
in accordance with Clause 501.
3004.1.3. Preparation of the area for pot-hole and patch repair: Each pot-hole and patch repair area
shall be inspected and all loose material removed. The area shall be cut/trimmed either with jack
hammer or hand tools like chisels, pick-axes etc., such that the area is in the shape of a rectangle or
square. The edges shall be cut vertically upto the level where the lower layer is stable without any loose
material. The area shall be thoroughly cleaned with compressed air or any appropriate method
approved by the Engineer to remove all dust and loose particles. The area shall be tacked or primed
with cutback or emulsion depending upon whether the lower layer is bituminous or granular in nature.
The sides, however, are to be painted with hoi lack coat material using a brush. The prime coat and
tack coat shall conform to Clauses 502 and 503 of these Specifications, respectively.
3004.1.4. Backfilling operation : The mix to be filled shall be either a hot mix or a cold storable mix_
(using bituminous emulsion). Mixing shall be done in a plant of suitable capacity. It shall be placed in
thicknesses not more than 100 mm (loose). H shall be compacted in layers with roller/plate
compactor/hand roller/ rammer. While placing the final layer, the mix shall be spread slightly proud of
the surface so that after rolling, the surface shall be flush with the adjoining surface. If the area is large,
the spreading and levelling shall be done using hand shovel and wooden straight edge. During the
process of compaction with roller or other means, the surface level shall be checked using a 3 m
straightedge.