Volume-IF - JantERmantER

DCPL-K4A02
The Kerb shall be laid by cutting trenches 150 mm deep. The width of the trench shall
be minimum and just sufficient to insert the kerbs. The inside faces of the Kerbs
shall be in plumb and the gap between the block shall not be more than 10 mm.
The kerbs shall be thoroughly packed with a mixture of stone chips (50%) and
moorum (50%) at the outside face. The laying and packing shall be done in a proper
workmanlike manner acceptable to the Engineer.
3.3.0 Sub-base (Granular Sub-base)
3.3.1 Description
3.3.2 Materials
This work shall consist of laying and compacting well-graded material on prepared
subgrade in accordance with the requirements of these specifications. The material
shall be laid in one or more layers as shown on the drawings and according to lines,
grades and cross sections shown on the drawings or as directed by the Engineer.
The materials to be used for the work shall be natural sand, moorum, gravel,
crushed stone, crushed slag, crushed concrete, brick metal, laterite, kanker etc. or
combinations thereof depending upon the grading required. The mixed materials shall
be free from organic or other deleterious constituents and conform to one of the three
gradings given in Table-II below.
TABLE-II
Grading for Granular Sub-base Materials
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Sieve designation
Percent by weight passing the seive
Grading 1 Grading 2 Grading 3
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80 mm 100 100 100
63 mm 90-100 90-100 90-100
4.75 mm 35-70 40-90 50-100
75 micron 0-20 0-25 0-30
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CBR Value (Minimum) :
for fraction of material
passing 20 mm sieve 30% 25% 20%
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Note : The material passing 425 micron sieve for all the three gradings when
tested according to IS:2720 (Part V) shall have liquid limit and plasticity index
of not more than 25 percent and 6 percent respectively.
3.3.3 Physical Requirements
(PCA.775.S034sca7) V.II-D2/S-VII : 7