|CHAPTER : 4.0
SUB-BASES, BASES ( NON-BITUMINOUS) AND SHOULDERS
|4.1||Granular Sub-base with Well Graded Material (CBR>30 or more) (Table:-400-1 & Table 400-2)
Construction of granular sub-base by providing well graded cum 849.00 material like natural sand crushed gravel or crushed stone having CBR >30, spreading in uniform layers with motor grader on prepared surface, mixing by mix in place method with rotavator or plant mix method at OMC, and compacting with vibratory rollers of 80 to 100 kN static weight to achieve the desired density, complete as per Clause 401 of Specification.
|Note :-This item can be executed only after prior written approval by C.E.
Lime Stabilisation for Improving Subgrade
Laying and spreading available soil in the subgrade on a prepared surface, pulverising, as per requirement of Table 400-3 mixing the spread soil in place with rotavator with 3 % slaked lime having minimum content of 70% of CaO, grading with motor grader and compacting with the road roller at OMC to the desired density to form a layer of improved sub grade as per clause 402 of specification.
|A By Mechanical Means||cum||428.00|
|B By Manual Means||cum||436.00|
Lime Treated Soil for Sub-Base
Providing, laying and spreading soil on a prepared sub grade, pulverising, as per requirement of Table 400-3 mixing the spread soil in place with rotavator with 4 % slaked lime with minimum content of 70% of CaO, to achieve CBR>30 grading with motor grader and compacting with the road roller at OMC to achieve at least 98%of the max dry density to form a layer of sub base as per clause 402 of specification.
Cement Treated Soil Sub Base/ Base
Providing, laying and spreading soil on a prepared sub grade, pulverising, adding the designed quantity of cement to the spread soil, mixing in place with rotavator, grading with the motor grader and compacting with the road roller at OMC to achieve the desired unconfined compressive strength and to form a layer of sub-base/base as per clause 403 of specification.
|4.5||Cement Treated Crushed Rock or combination as per clause 403.2 and table 400.4in Sub base/ Base
Providing, laying and spreading Material on a prepared sub grade, adding the designed quantity of cement to the spread Material, mixing in place with rotavator, grading with the motor grader and compacting with the road roller at OMC to achieve the desired unconfined compressive strength and to form a layer of sub-base/base as per clause 403 of specification.
|(i) For Sub-Base course||
|(ii) For Base course||cum||1340.00|
Lime, Fly ash stabalised soil sub-base
Construction of Sub-base using lime -fly ash admixture with granular soil, free from organic matter/ deleterious material or clayey silts and low plasticity clays having PI between 5 and 20 and liquid limit less than 25 and commercial dry lime, slaked at site or pre-slaked with CaO content not less than 50%, fly ash toconform to gradation as per clause 4.3 of IRC: 88-1984, lime + fly ash content ranging between 10 to 30%, the minimum unconfined compressive strength and CBR value after 28 days curing and 4 days soaking to be 7.5kg/sq, cm and 25% respectively, all as specified in IRC: 88-1984.
Making 50 mm x 50 mm Furrows Making
50 mm x 50 mm furrows, 25mm deep, 450 to the center line of the road and at one metre interval in the existing thin bituminous wearing coarse including sweeping and disposal of excavated material within 1000 metres lead
|a) 25mm deep furrow cutting
|b) 50mm deep furrow cutting||sqm||6.00|
Water Bound Macadam
Providing, laying, spreading and compacting stone aggregates of specific sizes to water bound macadam specification including spreading in uniform thickness, hand packing, rolling with vibratory roller 8-10 tonnes in stages to proper grade and camber, applying and brooming requisite type of screening/ binding Materials to fill up the interstices of coarse aggregate, watering and compacting to the required density as per clause 404 of specification.
|(i) Grading-I (63 to 45mm)|
|(a) Using Screening Type-A (13.2mm Agg.)||cum||1128.00|
|(b) Using Screening Type-B (11.2mm Agg.) cum 1190.00||cum||1190.00|
|(ii) Grading-II (53 to 22.4mm)|
|(a) Using Screening Type-B (11.2mm Agg.)||cum||1260.00|
|4.9||Deduction for item No.4.1, 4.2, 4.3, 4.4, 4.5, 4.6 & 4.8 if vibratory roller / motor grader is not used with prior written approval by C.E. :|
|i) If static roller is used in place of vibratory roller.||cum||50.00|
|ii) If motor grader is not used.||cum||50.00|
Crushed Cement Concrete Sub-base / Base
Breaking and crushing of material obtained by breaking damaged cement concrete slabs to size range not exceeding 75 mm as specified in table 400-9 transporting the aggregates obtained from breaking of cement concrete slabs at a lead of 1.0 km., laying and compacting the same as sub base/ base course, constructed as per clause 405 of specification.
Wet Mix Macadam
Providing, laying, spreading and compacting graded stone aggregate to wet mix macadam specification including premixing the Material with water at OMC in mechanical mix plant carriage of mixed Material by tipper to site, laying in uniform layers with paver in sub-base / base course on well prepared surface and compacting with vibratory roller to achieve the desired density in accordance to Table No. 400-12, 400-13 and as per clause of section 406 of specifications.
Crusher Run Macadam Sub Base/Base Course
Providing crushed stone aggregate, depositing on a prepared surface by hauling vehicles, spreading and mixing with a motor grader, watering and compacting with a vibratory roller to clause 410 to form a layer of sub-base/Base in accordance to Table No. 400-14, 400-15 and as per clause of section 407 of specifications.
|(i)For 53 mm maximum size
|(ii)For 37.5 mm maximum size
|4.13||Construction of Shoulders with approved material/selected soil i/c excavation all lifts & leads i/c grading to required slope & camber of 4% and compacting using vibratory roller of 80 to 100 kN static weight to meet requirement as per relevant clause of 400.|
|A Earthen Shoulders (CBR value >7)
|B Hard Shoulders (CBR value >12)
|C Paved shoulders|
|The rate may be adopted as applicable for different layers of pavement depending upon approved design of paved shoulders.|
Construction of Median and Island with Soil Taken from Roadway Cutting
Construction of Median and Island above road level with approved material deposited at site from roadway cutting and excavation for drain and foundation of other structures, spread, graded and compacted as per clause 408 of specification
Construction of Median and Island with Soil Taken from Borrow Areas
Construction of median and Island above road level with approved material brought from borrow pits, spread, sloped and compacted as per clause 408 of specification.
|4.16||Deduction for item No.4.13 if vibratory roller / motor grader is not used with prior written approval by C.E. :|
|i) If static roller is used in place of vibratory roller.||cum
|ii) If motor grader is not used.
Footpaths and Separators
Construction of footpath/ separator by providing a 150 mm compacted granular sub base as per clause 401 and 25 mm thick cement concrete grade M15, over laid with precast concrete tiles in cement mortar 1:3 including provision of all drainage arrangements but excluding kerb channel.