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SL No
Item Code
Description of Work
Unit



Code No. 8. 3.06.4.1
25mmBC: Providing 25mm thick (minimum) compacted pre- mixed bituminous carpeting to be prepared using 16mm down graded stone-chips (LAA value not exceeding 30%) to comply the gradation as specified, mixed with heated bitumen of 60/70 (Preferable) or 80/100 penetration grade heated straight run bitumen satisfying the requirements of ASTM/AASHTO. The bitumen and stone-chips shall be separately heated to a temperature 140°C-155°C and 150°C - 170°C respectively before mixing. The mixing shall be done at temperature between 140°C-160°C at a separate place away from the fire. The bitumen and stone-chips mixture shall be laid uniformly in proper camber, grade and super- elevation, only on the prepared and accepted base or surface in a single appropriate layer to give the specified compacted thickness. The mixture should be rolled with appropriate by Steel Drum Roller (3-5 tons) & pneumatic multiple tire roller (8-10 tons) to full compaction. The rolling temperature shall be maintained not below 90°C including supplying of all materials, their carriage, labourers, tools and equipment etc. all complete as per direction of the E-I-C. The bitumen in the mix shall be @4.5% to 5.5% by weight of total mix or as determined by job mix design. (In order to achieve the specified grading a blending of nominal maximum size of 16mm, 12mm, 6mm crushed stone chips and stone dust is suggested and proportion will have to determine by the laboratory analysis)

sqm

Effective Leng Length