Technical Specification.

For

Warehouse Floor Slab

Tesco Lotus DC at Samkhok

Thailand

For

Ek-Chai Distribution System Co., Ltd.

FC/08/3070/SP01/ 1

Rev Amendment By Date0 Tender Doc K Dare 4/03/081 various K Dare 15/3/082 Cracks/testing K Dare 20/3/083 Cracks / testing K Dare 21/3/08

Summary

The floor system: 210mm thick Jointless steel fibre reinforced slab on pilesFloor finish: A Quartz Dry Shake Power floated floor finishApproved steel fibres: Product: Tabix +1/60Supplier: Arcelor Mittal

General Note

These specifications are to be read with Face Consultants Drawing Numbers 6223-01, 6223-02 and 6223-03. Where there is contradiction between this specifica-tion and the drawings referred to above, this specification must take precedence.

5

Concrete

•The concrete is to be in accordance with BS EN 206-1 and Euro Code 2 and have a minimum cylinder strength of 28 MPa at 28 days and a minimum flexural strength of 4.0N/mm2. The concrete will have a minimum cement content of 325kg/m3 of a maximum cement content of 400kg/m3 and a maximum water ce-ment ratio of 0.42. •Cements can be Cem Type I or III 42.5 or Type II S (Max 30% GGBS)•Water / cement ratio: In order to minimize shrinkage the W/C ratio shall not be

more then 0.42. Plasticizers may be used to achieve the required slump.•Concrete shall be obtained from a batching plant, which operates under a quality surveillance system (certified concrete). This plant shall be approved by the con-sulting engineer.•The contractor shall submit a mix design for approval. This mix design shall be

specifically designed for steel fibre concrete and shall be approved by Face Consultants. The aggregates must be checked to a sieve curve analysis and be between the limits shown in the table below. If the concrete is to be pumped it can fall near the upper limit of the graph. If the concrete is to be dumped from the truck then the curve must be well below the upper limit.

Sieve (mm) Minimum passing (%) Maximum passing (%)0.125 3 60.250 5 11

0.5 12 201.0 21 302.0 29 404.0 41 508.0 52 72

16.0 78 9332.0

•Prior to construction of the slab, the proposed concrete mix is to be tested toshow that its coefficient of drying shrinkage is less than 0.045%. Tests are to be in accordance with ASTM C 157.

•Half of the concrete test samples shall be cured on site under the sameconditions as the actual concrete slab.

•Slump shall not be more than 125 mm +/- 20 mm before application of plasticizer. •Concrete strength shall be determined by crushing tests. Strength requirements shall be based on 28 days compressive strength. For the tests either cubes with sides of 150 mm or cylinders with a diameter of 150 mm and a height of 300 mm can be used. For each quantity of concrete poured in one day or for each 50 cubic meters, six test samples shall be made. Of the six samples per test, two to be tested at 7 days, two at 28 days and two to be tested at 56 days if the test at 28 days proves unsatisfactory. All test samples shall be stored by the Contractor in a place and under conditions to the Consulting Engineer's approval. The tests shall conform to BS 1881, ACI 318 or other comparable standards. Unsatisfactory test results may lead to disapproval of the sections of the Works with the concrete that does not meet the specified standards. All tests shall be performed at an institute

5

or agency approved by the Consulting Engineer. If no suitable institute is readily available, the tests may be performed by the contractor, with approved, calibrated apparatus and in the presence of a representative of the Consulting Engineer.

Steel Fibres

•Dosing: Steel fibre dosing shall be in accordance with the design but shall not be less then 45 kg/m3.•Type: Arcelor Mittal’s Tabix +1/60.•Application shall be done in strict accordance with the manufacturers recom-mendations.•The contractor shall do trial mixes to demonstrate suitability of mixing procedure.•An additional layer of B785 steel Fabric or equivalent cross sectional area per metre width of 785 mm2, 2.4m wide placed centrally over the first line of internal piles around the whole of the building. Fabric to have 50mm cover.•All re-entrant corners at columns to have 2 number T 12 bars, 1 metre long top and bottom, fixed at right angles to the corner with 40mm cover.

Joints

•The slab is to be isolated from the column bases with 20mm wide isolation ma-terial that is compressible such as ‘Miothene’ or similar approved. It is essential that the isolation material is taken to the top of the sub base to ensure complete isolation of the slab. All joints in the Miothene to be taped and no joint shall be within 100mm of the corner of a column. Isolation to the outside walls and edge beams can be achieved by continuing the slip membrane from under the slab and neatly trim at floor level.•All Formed Free Movement Joints (construction joints) to be ‘Permaban’ Alpha AD10 joints and fixed in strict accordance with the manufactures instructions and in strict accordance with the locations shown on Face Consultants Drawing num-bers 6223-01 and 6223-02.•All joint details and sections are shown on Face Consultants Drawing 6223-03.•All joints to be levelled in to a tolerance of +/- 1mm and re-checked during pour-ing. •All joints are to be sealed prior to practical completion with sealing compounds

having a minimum shore hardness of 50. These joints are to be inspected at 3-monthly intervals during the defects liability period and checked for arris dam-age.

•Any significant arris damage must be repaired with an epoxy mortar placed in ac-cordance with the manufacturer’s recommendations. At the end of the defects li-ability period, the joints in the aisles or free movement areas of the floor slab are to be resealed using a sealant with a minimum shore hardness of 80.

Performance Requirements

5

•The ground floor slab will be constructed so that the surface regularity (flatness and levelness) is within the tolerances as defined in The UK Concrete Society’s Technical Report 34 (TR34) 2003, Third edition. The floor should conform to cat-egory FM2 (special) as defined in table 4.2. of TR34. The floor is to be independ-ently tested by an independent UKAS Accredited specialist within 7 days of con-struction.•The ground floor slab wearing surface shall have a minimum abrasion resistance of AR1 in accordance with table 4 of BS 8204-2 2002. One abrasion test is to be carried out for each 2000m2 of slab or part thereof, in accordance with BS 8204-2 2002 to confirm that appropriate abrasion resistance has been achieved. Tests, to be carried out by an independent UKAS Accredited specialist after 28 days of con-struction.

Construction of the floor

•The contractor shall submit a detailed method statement to the consultingengineer for approval. This method statement shall describe in detail allworks, activities during pouring, and after care. The Contractor should demon-strate, with proof of survey results, that they have experience in casting floors to the required flatness standards.

•Roof and walls shall be installed before the execution of the floor can start. Theslabs shall be protected against wind and rain.

•A single layer of 1200 gauge Visqueen is to be placed on top of the pile cap be-fore placing the Visqueen for the main body of the floor•The ground slab is to be constructed on a 1200 gauge PIFA polythene slip mem-brane lapped a minimum 300mm and taped with 100mm wide Visqueen Girth Jointing Tape.•The floor shall be levelled and vibrated with either a ‘Somero’ S240 or SXP Laser Screed machine.•The floor will be poured in bays, as detailed on Face Consultants Drawings 6223 -01 and 6223-02. •Slab to be finished with a Quartz dry shake topping (minimum 5 kg/m2). Use Sikafloor – 3 QuartzTop (Natural), (www.sika.co.th) or similar approved by Face Consultants. •A ‘Somero’ Topping spreader MUST be used for the spreading of the Quartz dry shake topping to ensure that the correct amount of floor hardener applied is evenly distributed on the floor.•Depress (3 mm) a strip of 20 cm parallel to the Alpha joint profiles with a

steel trowel, in order to make sure that along these profiles 5 kg/m2 floorhardener can be applied.

•The contractor shall submit a pouring plan for every pour in which he describes all activities during the construction process.•Steel fibre content: In order to make sure that the steel fibres are properly mixed, one out of five truck mixers may be checked, starting with truck number one. Three samples shall be taken per truck (first part middle and last part).The con-crete mix as acceptable if the proportion of steel fibre differs by less then 10% from what is specified. If the proportion is more than 10% to low, additional steel fibres shall be added and shall be mixed for about 5 min. The truck shall be

5

sampled again. Also the next truck shall be sampled. Test to be carried out in ac-cordance with BS EN 14721:2005+A1:2007•Do not start too early or too late with the power floater. If too early, the floor hardener penetrates too deep in the concrete. This will reduce the hardness of the floor hardener. If too late, the floor hardener will not mix with cement and surface will burn after excessive power floating. “Contractor should have sufficient experi-ence to determine the right moment of power floating”.•Immediately after the final power trowelling operation, the floor is to be sprayed with an acrylic based, curing, sealing and hardening membrane (StoCrrll ACC by Sto SEA Pte Ltd, or similar approved) in strict accordance with the manufacturer’s application instructions. The floor shall not be trafficked for a minimum of seven days following the sealing operation and should not be loaded for 28 days. Any al-ternative must be approved in advance by Face Consultants. The following morn-ing the floor is to be first covered in water and 1 layer of 1000 gauge plastic sheet-ing applied to further enhance the curing regime. The plastic sheeting is to remain in place for at least 7 days. The surface of the floor is to be continually wetted for a minimum of 7 days.•After application remove cement spills from adjacent panels.•Barricade fresh poured panels with red tape to avoid trespassing for a minimum of 7 days.•Protect walls of the building with 1 metre high plastic sheeting taped to walls.

After Care

•Floor can be used 7 days after it is poured by light traffic the loads shall notexceed 30% of the design capacity. The floor can be loaded till it’s designcapacity only after 28 day.

•All efforts should be made in the construction and detailing of the floor to reduce the possibility of random cracking. If cracks do occur, they are to be pressure grouted with a low viscosity epoxy mortar if they are wider than 0.5 mm.