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. 422 The width of joint shall correspond to the space between the ends of the slabs. For the expansion joint the copper plate shall be of 1.63 mm (16 gauge) thickness with a width of 30 cm (about 12”). The bituminous filler shall be as under: 1) Poured joint filler: The poured joint filler shall be composed of the following ingredients: Clean fine sand : 55 percent Bitumen S.35 grade of I.S. 73-1961 : 40 percent Asbestos Fibre : 5 percent The sand and the bitumen shall be heated separately to the temperature of 163 0 C (about 325 0 F). Both sand and bitumen shall be mixed intimately after heating. To this shall be added asbestos fibre and the whole mixed thoroughly. While hot, the mixture shall be poured into the clean dry joint and allowed to thicken. The mixture shall be laid slightly poured and if found to be very high, the surplus shall be removed by heated knife or trowel. When propriety product from the market is to be used, it shall conform to I.S. 1834-1961. 2) Pre-moulded joint filler: The joint filler shall be composed of the following ingredients: Clean fine sand : 60 percent Bitumen S.35 grade of I.S. 72-1961 : 30 percent Cement : 8 percent Chopped Hemp : 2 percent
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 423 The sand shall be heated in a flat pan to a temperature of 1770C (about 3500F). The bitumen shall be separately heated to a temperature of 1630C (about 3250F). The requisite quantity of bitumen shall be added to the heated sand and stirred well. The required quantity of cement and chopped hemp shall be added and the whole mixed intimately. All the materials shall be measured by weight. The mixture shall be then poured into moulds and allowed to cool. Width of the moulds shall be such as to fill the U of the copper plate and remain about 25mm. below the top of the slab. When proprietary product from the market is to be used it shall conform to I.S. 1838-1961. 16.3 Construction: The copper plate shall be bent and shown on the drawings and shall be laid over the R.C.C. deck-slab with its U in the gap in between adjacent deck-slabs. The wearing coat concrete shall then be laid leaving requisite width of the joint in between the two wearing coat- slabs. If full width of bridge is not obtained in one piece of the copper plate, pieces of copper plates shall be brazed together to obtain the requisite width i.e. the width of the bridge. When the slabs are cured and are to be opened to traffic, all the dirt, mud etc. accumulated in the joints during the process of curing of the slabs shall be raked out, cleaned and washed before filling in the bituminous filler. The joint between the two wearing course slabs and the U of the copper plate shall then be filled with the bituminous filler. In case it is so ordered by the Engineer, the joints shall be formed of pre-moulded joint filler and in such a case, this pre-moulded joint filler shall be placed in the joint immediately before taking up the concreting of the adjoining slab of the wearing coarse. These pre-moulded joint fillers shall fit the U of the copper plates also and remain about 25mm. below the top of the slab. This gap shall be filled with poured joint filler.
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