cracks on external wall and side part of the base slab (equal or greater than 0.20mm) injection hose at a 45 deg. f. One end of the injection hose shall be attached to the lowest packer on vertical cracks or to either end of horizontal cracks. V.9.1 General HSE Plan Health, Safety and Environment Plan, Note: All dimensions are in mm unless specified. 12. It should be capable enough to maintain the correct position, shape and profile of structure. 5. 2. 2. The Site Engineer and the QC will monitor the concrete placement and will notify the Site Agent of any unacceptable materials or operations for action. Approved Stop boards in vertical position are required to be provided at the end of each section of work for single pour. Supervise operations in accordance with the approved Method Statement, shop drawings, specifications, material submittals and schedules to achieve the acceptance of the project deliverables. * Column, slab etc. Estimated free W/C ratio Any clashes between holes, cast-in items and reinforcement shall be resolved before placing concrete. 3. For deep members having a depth more than 300mm shall be compacted with suitable immersion type vibrators whereas horizontal members like roof slabs, floor  slabs, pavement slabs or top layer of raft can be vibrated with plate/surface vibrators for achieving required finish. V.11.2.2 Blowholes (re-profiling 0 to 10 mm deep) 8. Particular Specifications: 5.16.7 Hand Tools (Various), III. Attention to full and proper preparation of the substrate is essential for complete   repair adhesion. Walking on reinforcement for access purposes will be avoided where possible. This method statement for in-situ concrete & general concrete work describes the process to be implemented during the entire activity for such as in-situ concrete, concrete foundations, slab on grade, blindings,  columns, beams, retaining walls, slabs, raft concrete, precast concrete, self-consolidating concrete, mass concrete and any structural concrete works. c. Placing shall be done depending upon the thickness of filling referring to approved product data. Mixing, Placing and Curing 3. Mixing For bend and re-bend tests, nominal mass per meter and surface geometry, one test piece per 30 ton and nominal diameter. They should be inserted vertically inside the concrete. 1. b. Reshoring to beams and slabs shall be placed immediately after stripping formwork. 4. R. Formworks 10. Concrete frames also provide the inherent benefits of fire resistance, excellent acoustic and vibration performance, thermal mass and robustness – all at no extra cost. Formwork shall not be stroked or stripped unless concrete has attained enough strength to withstand operation load and self-weight. Fabrication of reinforcement may be done on site or in the fabrication shop. Laps and anchorages shall be as shown in design drawing or as approved by the Engineer. Total construction time is less as compared to cast-in-situ. 1. The temperature of each truck of concrete shall be measured using either a glass, dial type or electronic thermometer, just before the placing of the concrete and the temperature recorded on the delivery ticket. Appendix A: Drawings, Diagrams, and Maps Midwest Formwork (UK) Ltd is a market leader in the field of Reinforced Concrete Frame and Groundwork Construction. Risk Assessment 2. All concrete surfaces within the formwork area should be saturated with clean, fresh water for several hours prior to grouting. 6. It involves pouring liquid concrete into removable forms and then dismantling the forms once the concrete has hardened to leave a solid wall behind. 1. Plate / Surface Vibrators Where permission for welding is given by the Engineer, the following shall apply: 2. 5. No concreting shall be commenced until the Engineer has approved the formwork, V.5.3.4.5 Tolerances a. c. The permanent elongation after loading to 60% yield strength (fy) shall not exceed 0.1mm. All temperature values are in degree centigrade unless specified. General, X. The target audience will be all of those involved in the design and construction of in situ concrete frame buildings including the material supply chains where relevant. Cooling and/or insulation of the concrete shall be carried out as necessary to maintain the above conditions. Project Engineer Formwork Mats used for curing can either be left in place and kept saturated for completion of the curing, or can be subsequently replaced by curing compound, plastic sheeting, reinforced paper, straw, or water. c. Under no conditions shall the temperature of the cement exceed 68 degrees when it enters the mixture. V.3.5 Dimensional Tolerances Duration of works shall be as per Baseline Schedule, 7. q. V.9.4 Forming Erection Tolerances are as follows unless specified in the approved drawings: 10. 2. Ensure validity and serial number of calibration certificates is available and posted in the survey equipment. Frame & Load Bearing Structure, RCC bands in Load Bearing Structure (Masonry Building), Difference between Reinforced Concrete & Steel Framed Structure. Health, Safety & Environmental Plan Cast-in-situ concrete has less strength as compared to precast concrete. 3. The preparation of in-situ concrete is done at the construction site base on their mix ratio and poured in to reinforce concrete form work at jobs site. 9. 3. 1. c. Fully expose any corroded reinforcement in the repair area and continue until uncorroded steel is reached. Schedule the project in logical steps and budget time required to meet deadlines. all embedded Secs 8. Emergency procedure. Ready-mixed concrete Formwork – Geometry Wash off the concrete with plenty of water and seek for First Aid Treatment, if necessary, 2. Ready Mix Supplier – xxxxx (Name of Supplier goes here) b. Form tie rod / bolt holes, cone holds and voids Grooves shall be formed by using timber or other approved formers and shall not be formed by cutting back or raking out the joint filler. b. III. 12. 4. Ready-mix concrete shall conform to BS 8500 in addition to GSO EN 206-1, except j. Angle to pass through the crack in the center of the wall or slab thickness. 01. 5. When the specified strength is 35 MPa or less, no individual strength test (average of at least two specimen tests) shall be more than 3.5 MPa below the specified strength, f’c 13. Where slabs, beams and walls incorporate construction joints, panels shall generally be constructed consecutively. The floor slab may crack due to large settlement; an option is to use either concrete ‘beam and block floor’ or a suspended timber. 3. To maintain the records of all surveying equipment handled. Kickers shall be constructed integrally with the lift of concrete below. Special Safety Requirements 4. Make V-groove cut all identified cracks. g. First Aid Material. Plastic Spacers e. Inject until the complete crack is totally penetrated and dry. Continue with the succeeding ports until the grouting process completed. Reinforcement couplers shall be used strictly in accordance with the manufacturer’s written instructions. d. Name of technician In-situ concrete is strong, durable, stable, readily available and relatively economic in terms of construction and life time maintenance. b. 6. a. Blowholes d. Oil and grease deposits are best removed by steam cleaning, detergent scrubbing or the use of a proprietary degreaser He is a senior editor at GharPedia and, core member of Editorial Team, & senior manager at SDCPL (Civil Eng.). External vibrators shall not be used without the approval of Engineer in writing. 5. d. Fully expose any corroded reinforcement in the repair area and continue until uncorroded steel is reached. V.5 Concrete Casting Contractor shall ensure that the formwork is capable of handling operational load, concrete load in addition to its self-weight. An overall Case Study will be prepared for the project as a whole, summarising the overall benefits. Probable Cause/s: Impact from Heavy Object; Form Stripping, Poor Vibration, Loss of  Grout. 5. 3. V.3.1 General Criteria V.10.1 Slump Test 7. V.10.2 Concrete Strength Test Sampling Their design must be checked before construction. V.2.2 Mechanical Splices thickness. 3. iii. 3. 2. This method is not fully comprehensive but helpfully provides the ideas on how the concrete works associated with the risk assessments and related requirements are outlaid. : xxxxxxx 3. 5. Re-routing of existing Temporary Roads V.8.4.1 Aggregates 14. Concrete shall be thoroughly wetter during and immediately after form removal process. b. Sthapati Designers & Consultants Pvt. Couplers shall conform to the requirements in BS 5400. 5. Cubes shall be numbered consequently and marked: It is the ideal structural material, in … Safety awareness meetings will be conducted every working day morning/every other day to brief the workforce in the safety prevention measures. 3. 5. Permit and Licensing Requirements 2. Site Engineer Site Foreman Concrete shall not be moved from one place to another by means of vibrator. 5. Setting out of work shall be done by surveyor either for concrete or for any activity including formwork which confirms the shape, size and level of the structural element. Probable Cause/s: Insufficient Vibration, High W/C Ratio 6. 2. Liquid material is poured in forms at the building site. The spacers will be as per BS8110-1, Clause 7.3 and BS 7973. In the case of in situ construction, each segment is cast in situ using a formwork usually suspended from a steel frame supported by the previously cast segment. On the other side, cast-in-situ concrete is the conventional method for concreting, it is very and largely used for construction, and any local contractor can adopt this method. They should stimulate fundamental change in this process in order to yield significant improvements in the cost, 5. at the construction site. At present, the expenditure on labour (preparation and dismantling of formwork, reinforcing, and casting and finishing of concrete) almost equals the cost of … After curing and obtaining approval of the blinding concrete, a surface preparation shall be done prior to commencing Waterproofing works. V.5.2.5 Roof Slab Walls shall be keyed on cast kickers 150 mm high or on the tops of walls meeting the soffits of suspended members. 3. Calibration Certificate for Survey Equipment 1. N. Structural Concrete 14. I. The size and sequence of the pour shall be planned so as to minimize the internal and external restraints and associated thermal and shrinkage cracking. Power Tools (Various) Weather condition has no effect on casting work. Increase rate of Slump loss, tendency to add water at job site; V.8.4.3 Cement Where not practicable to cast pipes and specials in concrete, box holes shall be formed in the shuttering. 1. 12. To conform to the requirements of this specification, strength tests representing each class of concrete must meet the following requirements: 5. V.10.3 Testing of Concrete Cube Samples Bond breaker tape shall be fixed continuously and evenly along the bottom of the groove for the full width and length of the groove. APPENDIX D: Inspection & Testing Plan (ITP) 9. c.  All relevant details of composition, manufacture, strengths and other qualities of the steel. The adopted codes govern on this method statement for concrete is the British Standard (BS) but it should be based in order of precedent with the Project Specifications, Contract Agreement, Addendum and Special Provisions, etc. Reinforcement and steel formwork shall be covered to shade it from the sun 24 hours prior to concreting. Bearing Plate/Base Plate 4. 1. When concrete is placed in vertical members, walls, columns and the like, the lifts of concrete shall finish level or, in sloping members, at right angles to the axis of the members, and the joint lines shall match features of the finished work, if possible, or be formed by grout checks. d. If concrete is required to be done on earlier concrete work, it is the responsibility of the QC Engineer to approve that concrete had hardened (% Strength) enough to withstand a load of reinforcement, formwork, fresh concrete and concrete operations. Ready-mixed concrete While no repair works are required for cracks in the unreinforced concrete section provided that the structural integrity of the concrete is not affected. Form ties shall be factory fabricated, adjustable, removable and capable of preventing deformations. 4. d. If packers are being used, drill holes along the center of crack to accept the packers. sufficiently green, the formwork shall be removed, as necessary to expose the construction joint, subject to the requirements of curing. Helpers/Laborers 6. Joint filler shall be cut to size before fixing and shall be securely fixed in position to the existing concrete surface before concreting. HSE Engineer Total construction time is more as compared to precast. g. date of fixing in position Keep the batching and mixing plants under shade. d. name of Contract and location of office V.5.3.4.4 Sealing Joints e. The grade of concrete to be poured. a. Immediately prior to application of approved material, the prepared substrate should be blown clean with oil-free compressed air. The Plant Manager shall monitor the prevailing Ambient conditions, concrete mix temperature trends etc. If the concrete surface is defective or has laitance, it must be cut back to a sound base; Plant and Equipment 2. 11. 6. Site Foreman Permit and Licensing Requirements The maximum temperature of concrete at the point of placing shall not be more than 32 °C. 2. While propping through two floors, the Contractor shall ensure, that the props beneath the floor last constructed are released over its full extent as soon as the concrete has achieved sufficient strength to support itself plus any superimposed loading, but not sooner than the periods given in Table for Stripping of Formwork. Interfacing with Other Operations 1. The plan should be approved by the engineer before the start of work. 16. V.3.6 Early Loading In wet weather, the concrete shall be adequately protected as soon as it is placed. 5. 5. They shall have a factor of safety not less than 1.5. 2. The Surveyor shall prepare the layout by establishing the required elevation such as slab soffits, elevation of top bars, top of slab, etc. 14. Curing compounds shall be applied in accordance with the manufacturer’s recommendations immediately after any water seen which may develop after finishing has disappeared from the surface and within 2 h of stripping formwork on formed surfaces. 8. Concrete pouring the for concrete thickness of ≥ 600mm shall be considered as mass concrete and shall be done as per section V.5.2.4 of this document and shall conform to the submitted Method Statement for Mass Concreting Works. The Plant Manager shall ensure availability of flaked ice and the like in sufficient quantities for the scheduled concrete works and the backup arrangements are secure. 7. Special care required against drying winds. All joints shall be prepared following the specifications mentioned in section V.5.3. Inject approved material until it start to flow out to the next port, seal off the port being injected and move on to the next port. 8. Pipes and pipe specials through concrete walls shall be positioned correctly. Any defect noticed in concrete shall be rectified by methods approved by the consultant and client. 1. 4. 6. 6. a. Disfigure permanently exposed surfaces must be taken to ensure consistency of inter-coat bond strength. V.5.1 Preparation for Pour The cons of in situ concrete: There’s a chance it can leak once constructed – often caused by reduced skill levels and on-site quality control when being constructed It’s very labour intensive on-site work – and it can take a long time. Less resistant to Earthquake and wind forces not recommended where seismic loads are dominant. h. source of aggregate 2. 4. 3. Before permanent sealing, grooves for joint sealant shall be protected from contamination by a temporary sealing strip or cover or by other methods agreed by the Engineer. The grooves shall be located over the joint filler such that the upper surface of the joint filler is entirely contained in the groove. 7. Elements of varying lengths and shape can be developed. It is especially important to keep cool those surfaces of the equipment, which will come into direct contact with the material itself. Testing of samples shall be in accordance with the Project Specifications following criteria of approved ITP. Ensure the proper implementation on Quality system and monitor overall quality of the work is maintained. i. Non-structural Cracks equal or greater than (>) 0.20mm, but () 0.2mm The minimum tensile yield strength for all reinforcing steel bars shall be 500 MPa with a minimum modulus of elasticity of 190 MPa. While cast-in-situ concrete is cast in its actual location, precast concrete is cast at another location, either at the building site or in a factory, and is then lifted to its final resting place and fixed securely. Precast concrete floor Precast concrete columns and beams 5. shrinkage cracks or surface cracks equal or V.4 Concrete Transport Use below filters for find specific topics, You can use below filter for finding the nearby professionals. It is one of the most common forms of construction of floors in buildings. XI. 4. 2. Surface cracks extending to bar reinforcement and excess of 0.2mm in width and 25mm in depth shall be injected by a low viscosity resin. The Contractor shall submit his proposed method of transportation to the Engineer for approval. IV. c. On all other elements b. Substrate priming shall be done following the procedure mentioned in approved material technical data sheet. Tie Wires 1.6 mm The Contractor shall deliver the units from the casting site to the project Site in accordance with schedule and proper setting sequence. Immediately prior to placement, the mixed grout should be briefly agitated to release any surface tension. 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