1 of 18  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 06: Concrete and Steel Works  During very hot weather conditions, the Contractor may be required to cool formwork containing con- crete by spraying with water. This shall be carried out where directed notwithstanding and whatever  other measures the Contractor may have employed for the curing of the concrete. All materials, spray  equipment and an ample supply of water for curing shall be ready on site before any concreting starts.  In order to incorporate the effects from thermal action, shrinkage and creep, the Contractor shall make  construction joints or contraction joints in accordance with this Employer’s Requirements. The Con- tractor shall make his design calculations in accordance with the intended location of joints.  In construction joints, the reinforcement passes through the joint. The purpose of this type of joint is to  separate the structure into sections equal to a size which easily can be cast. In critical sections with a  high stress, the joints shall be made with an approved water stop. The surface of the concrete shall be thoroughly cleaned. The surface layer shall be completely re- moved with a steel brush to expose the aggregates.  The hardened concrete shall be watered continuously for 1 hour prior to casting the adjacent concrete.  When casting, the hardened concrete surface shall be saturated but free from water on the surface.  Cement grout and adhesives shall not be used at joints.  Complete contraction joints have no restraint to movement, but are intended to accommodate only  contraction of the concrete. Partial contraction joints provide some restraint, but are intended to ac- commodate some contraction of the concrete. Both types of contraction joints are allowed in the  works.  Contraction Joints  Expansion Joints  Expansion joints have no restraint to movement and are intended to accommodate either expansion or  contraction of the concrete. Expansion joints are allowed in the works.  The following general requirements shall apply to both expansion and contraction joints:  (a) Filler Boards  (b) Dowel Bars  Dowel bars shall be round mild steel complying with TS 708 and shall be sawn or flame cut to length.  Flame cut bars shall be dressed by grinding to remove any snags or lips. Dowel bars shall be straight  without any irregularities likely to interfere with longitudinal movement in the concrete.  Filler boards in expansion joints shall be of approved material securely fixed at right angles to the sur- face of the concrete within a tolerance of 1$^{o}$. The boards shall extend without any gaps from the under- side of the sealing groove to the base and between side forms or existing slabs. Dowel bars where  specified shall be a close fit where they pass through boards. Joints in boards shall be taped to prevent  discontinuities.  6_Vol3_d4.3_Section 6 Concrete and steel works_en_GIR_rev6.docx  6.1.11 Joints Construction Joints 