Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 06: Concrete and Steel Works  1 of 18  Dowel bars in expansion joints shall be fitted at one end with sleeves which are a sliding fit on the bar  and which contain compressible filling in the end remote from the bar, all to the dimensions and de- tails shown in the Drawings.  (c) Sealing Grooves and Sealant  Caulking grooves shall be provided where necessary and as specified. At all joints where a caulking  groove is formed, the groove shall be wire brushed and loose material removed and blown out by  compressed air immediately prior to caulking. After the groove has dried, it shall be primed and  caulked with approved jointing compound applied in accordance with the manufacturer's instructions.  At all caulked joints, the face of the caulking strip and a 50 mm width of concrete on either side shall  be painted with two coats of primer having the same base as the caulking compound.  Joints in the concrete shall be sealed with an approved sealant from an approved manufacturer, which  is suitable for the particular location and environment. Joints shall be sealed immediately after the ex- piry of the concrete curing period or as soon thereafter as weather conditions permit.  Before sealing is carried out, the sealing grooves shall comply with the following requirements:  1. Grooves shall extend across the bays from edge to edge in the case of transverse joints and  shall be continuous in the case of longitudinal joints.  2. In expansion joints, the filler material shall be exposed for the full length of the joint.  3. All grooves shall be dry and free of loose aggregate, paint, corrosion, oil, bitumen spillage,  waterproofing agents, concrete curing agents, or release agents.  Bond breaking tape or other suitable material acceptable to the Engineer shall be placed in the bottom  of the groove to leave the specified depth for the seal.  Primer shall be applied evenly to the sides of the grooves ensuring complete coverage. The interval  between priming and sealing shall be within the limits specified by the sealant manufacturer. In dusty  conditions, the primed joints shall be protected from contamination. The sealant shall be prepared and applied in accordance with the manufacturer's instructions. Care  shall be taken to avoid trapping air or forming bubbles and the finished surface of the sealant shall be  smooth and free from blemishes to the specified level.  Expansion and contraction joints shall be placed in the positions and in accordance with the details  shown on the Drawings.  6.1.12 Waterstops  Waterstops shall comply with TS 2810 and TS 3078.  When waterstops are placed for water tightness, the waterstops shall be made by an appropriate mate- rial resistant to chlorides, sulphates, chemicals and the like which is approved by the Engineer.  The width of the waterstops shall be according to the manufacturer's specifications.  All waterstops shall be made continuous and shall be welded at all connections. Overlapping shall not  be allowed. All joints in waterstops shall be made by the manufacturer of the waterstop.  6_Vol3_d4.3_Section 6 Concrete and steel works_en_GIR_rev6.docx 