1 of 18  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 06: Concrete and Steel Works  good of cracks in the concerned wall section shall, where practicable, be carried out from the inside  face. Adjacent internal chambers within a structure shall be tested sequentially in case the treatment process  allows for emptying of the respective chamber independently of the whole structure. In this case, the  chambers adjacent to the chamber under test shall be empty during the test period.  Workmanship in formwork and concreting shall be such that the concrete shall normally require no  making good with the surfaces being perfectly compacted, smooth and with no irregularities. Concrete  surfaces for the various finishes shall not exceed the maximum permitted tolerances stated in the table  below. The tolerances within which concrete work shall be constructed are as summarized below:  The Contractor shall be responsible for keeping the deviations of the finished concrete structures with- in the limits given, and any rectification of work not constructed within the tolerances set out shall be  entirely at the expense of the Contractor.  Any remedial treatment to concrete surfaces shall be agreed with the Engineer following inspection  immediately after the stripping of formwork and shall be carried out without delay.  Any concrete surface which is found to have been treated before inspection by the Engineer shall be  rejected.  Any minor surface blemishes shall be repaired to the satisfaction of the Engineer immediately after  completion of curing. Remedial measures may include, but shall not be limited to, the following:  6_Vol3_d4.3_Section 6 Concrete and steel works_en_GIR_rev6.docx  b) Fins, pinhole bubbles, surface discoloration and minor defects may be rubbed down with sack- ing and cement immediately the formwork is removed.  a) Holes left for formwork supports shall be thoroughly cleaned out to remove all loose material  and the sides shall be roughened, if necessary, to ensure a satisfactory bond. They shall then  be filled with dry-pack mortar.  6.1.15 Remedial treatment of concrete surfaces  6.1.14 Tolerances of dimension and surfaces of in-situ concrete  Item of construction  Permissible deviation  Position in plan  ± 20 mm  Wall and slab thickness  ± 6 mm  Columns and beams  ± 6 mm.  Dimensions of foundations  + 50 mm / - 0 mm.  Variation from plumb: (vertically - up to 5 m) ± 12 mm.  Levels to slabs and beams:  ± 10 mm.  Holes Placement: ± 10 mm  Hole Size  ± 3 mm.  Cast-in items (reinforcement bars or wire  strands) Placement: ± 10 mm  Distance between interconnected items: ± 2 mm. 