particular specifications (road works) - CIDCO Maharashtra Ltd.

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CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 286 9.4 PROPORTINONG OF MATERIALS : The quantities of aggregates and bitumen required for the work of 75mm compacted bituminous bound macadam is detailed below: a. 40mm size hand broken metal 9.00 cum. Per 100 sq.mt. b. 20mm size crushed metal 1.50 cum.Per 100 sq.mt c. 12mm size key aggregate 1.80 cum.Per 100 sq.mt. d. Bitumen 250 kg. per 100 sq.mt. 9.5 PREPARATIONS OF BASE: The road surface shall be swept clean of all dirt, dust and other loose and foreign matter. The work shall be performed on such widths and lengths as directed by Engineer-in-charge and may required scarifying of existing layer, filling of pot holes etc. The edge line may be marked with stakes (formed or murum or metal 25 cm 30 width) Tack Coat : The tack coat over cleaned surface shall be applied with mechanical sprayer with flow meter attachment. 9.6 SPREADING AND COMPACTION: 9.6.1 Spreading of 40 mm size metal: 40 mm Size hand broken metal shall be spread evenly at the rate of 9 cum per100 sq.m. of area so as to form uniform layer over the width of road specified on plans any foreign matter, organic matter, dust grades etc. shall be removed immediately. The sections shall be checked with camber board, straight edge batten etc. Any irregularities shall be made good by adding aggregates in case of depressions and removing aggregates from high spots.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 287 Compaction of 40 mm size metal: The surface of 40mm metal layer after brought to necessary grades sections shall be rolled with the use of vibratory roller. Rolling shall commence from the edges and progress towards the center longitudinally except super elevated portion it shall progress from the lower to upper edge parallel to the centre line of pavement. When the roller has passed over the whole area as prepared once, any high spots or depressions which become apparent shall be corrected by removing or adding aggregates. The rolling shall then continued till the entire surface has been rolled to desired compaction such that there is no crushing of aggregates and all roller marks have been eliminated. The each pass of roller shall uniformly overlap not less than one third of the track made in the preceding pass. 9.6.2 Spreading of 20 mm size metal : 20mm size crushed metal shall be spread evenly at the rate of 1.5 Cum per 100 sq.mt. of area over the 40mm size hand broken metal. 9.6.3 Compaction after spreading of 20 mm size metal : The surface of 20 mm metal layer after brought to necessary grades and sections shall be rolled with the use of 8 to 10 vibratory roller. Rolling shall be commence from the edges and progress towards the centre longitudinally except on super edge parallel to the centre line of pavement. When the roller has passed over the whole area as prepared once, any high spots or depressions which become apparent shall be corrected by removing or adding aggregates. The rolling shall then continued till the entire surface has been rolled to desired compaction such that there is no crushing of aggregates and all roller marks have been eliminated. The each pass of roller shall uniformly overlap not less than one third of the track made in the preceding pass.
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