Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements Section 09: Building Works  5 of 24 9.1.3 Works to be measured  9.1.4 Approval of materials and workmanship  9.1.5 Bricks  9.1.6 Mortar  9.1.7 Floor screeds  9.1.8 Terrazzo paving  The Contractor shall, unless otherwise specified herein, supply all materials, equipment, temporary  works and labor necessary to perform, maintain and complete the building works.  The supply of all materials and items shall be subject to the approval of the Engineer. The Contractor  shall provide such samples as the Engineer may require in advance for the approval and, when ap- proved, the quality of materials and workmanship shall be at least equal to the approved samples.  Bricks shall be clay facing bricks manufactured locally. The quality shall be in accordance with TS  EN 777. Bricks shall be hard, sound, square and clean with sharp, well defined arises.  The Contractor shall submit samples of each type of bricks used in the works and obtain the Engi- neer’s approval before placing orders with suppliers. Strength test certificates performed on the basis  of appropriate Turkish standards shall also be submitted on request of the Engineer.  Materials used for mortar shall be measured in gauge boxes. All concrete surfaces shall be adequately  prepared and keyed to receive screeds. The screeds to be carried out have to be placed within buildings  and shall be dense aggregate cement screeds.  Floor screeds in operation buildings shall be laid monolithically to a thickness of minimum 2.5 cm and  be laid separately.  The preparation of base concrete shall include the removal of laitance from the concrete surface to re- ceive screed and the removal of all loose concrete, dust and dirt by thorough washing with water.  The screed mix shall thoroughly and efficiently be mixed dry by mechanical means until a uniform  distribution is obtained prior to adding the water. The water content shall be kept as low as it is neces- sary to allow for sufficient workability for laying and compacting. Where only small quantities are  required, mixing might be carried out by hand on clean watertight surface with the approval of the En- gineer. The screed mix shall be placed between forms, rigidly fixed on a firm foundation and set true to level  within +/- 3 mm, and shall be fully compacted by means of a screed board providing laitance is not  brought to the surface. The screed wearing course shall be tamped with a wood float and trowelled  with a steel trowel to produce a smooth finish.  The screed mix shall be placed between the forms (and or other bays) worked around the penetrations,  duct covers, manhole covers, gutters, balustrade standards, pipes, etc., and shall be fully compacted by  means of a screed board, or other suitable compacting equipment, providing laitance is not brought to  the surface.  All floor finishes shall be slip-resistant without any abrasive projections or sharp edges in wet and dry  conditions.  9_Vol3_d4.3_Section 9 building works_en_GIR_rev6.docx 