1 of 18  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 06: Concrete and Steel Works  c) Abrupt and gradual irregularities may be rubbed down with carborundum and water after the  concrete has been fully cured.  d) Small defects and minor honeycombing shall be chipped out perpendicular to the face of the  concrete to a depth of at least 25 mm and filled with dry-pack mortar.  e) Fissures shall be repaired by using epoxy based materials or by using materials approved by  the Engineer.  All other defects will be regarded as too extensive to permit satisfactory repair and the concrete con- taining the defect shall be broken out and replaced.  6.1.16 Dry-pack mortar  Dry-pack mortar for filling holes and repairing surface blemishes shall be from one part by weight of  cement and three parts fine aggregate passing a 1 mm sieve and epoxy based materials. Additives to  improve workability may be added to the approval of the Engineer. The colour of the mortar shall  match that of the surrounding concrete. The mortar shall be mixed with only sufficient water to make  the materials stick together when being moulded in the hands.  The dry-pack material shall be placed and packed in layers having a thickness not greater than 15 mm.  The compaction shall be carried out by use of hardwood stick and hammer and shall extend over the  full area of the layer, particular care being taken to compact the dry-pack against the sides of the hole.  After compaction the surface of each layer shall be scratched before further loose material is added.  Holes shall not be over filled and the surface shall be finished by laying a hardwood block against the  dry-pack fill and striking the block several times. Steel finishing tools shall not be used and water shall  not be added to facilitate finishing.  In the case of using epoxy based materials, the Contractor shall provide material catalogues and meth- od of application to the Engineer for his approval. No additional payments shall be done for these re- quirements and any necessary tests shall be carried out after repair.  6.2 Steel Reinforcement  6.2.1 Types, quality and storage  Reinforcement shall comply with EN 10080, TS 708 (Steel bars for concrete) and TS 4559 (Steel  mesh for concrete).  Prestressing steel wire or bars shall be of low relaxation strand type in accordance to TS 3721, BS  5896-80 or DIN 4227.  Reinforcement bars shall have strength equal to high yield steel bars and shall be ribbed bars.  The characteristic yield stress of reinforcement steel shall be at least 420 N/mm$^{2}$ (BÇ III Class).  The Contractor shall furnish the Engineer with copies of the manufacturer's certificates of tests for the  steel reinforcement to be supplied.  The Contractor shall prepare test specimens of steel reinforcement to be used in the Works. Test spec- imens shall be taken in the presence of the Engineer and shall be of a size sufficient to carry out the  tests as described below. They shall be tested in an approved laboratory and the certified copies of the  results of the tests shall be submitted to the Engineer. The specimens shall be tested for bending and  6_Vol3_d4.3_Section 6 Concrete and steel works_en_GIR_rev6.docx 