B. Couplers g. Chloride-induced corrosion will further require high-pressure washing with clean water after blasting to ensure complete removal of the corrosive elements. When the concrete temperature exceeds these limits, the Contractor shall inform the Engineer and investigate the cause. Steel Reinforcement Please refer to the attached document in Appendix B. VII. IV. f. Identify areas where steep cooling gradients may occur, and how cracking will be All materials to be used for repair works shall be submitted for approval thru Material Transmittal. 4. Sealant (qaqcconstruction.com recommends), Click this link for your download: QA/QC Templates, Method Statement The Thermal Control Plan shall be based on the design assumption that cracking of the concrete as a result of heat of hydration shall not occur. 1. Attachments Tools and Equipment. Attention to full and proper preparation of the substrate is essential for complete repair adhesion; The Contractor shall allow for the increase in concrete temperature in the period from dispatch from the plant while in transportation or whilst awaiting placement on Site and take adequate measures to ensure the maximum temperature is not exceeded. a. Injection packers inserted into pre-drilled holes shall be fixed at intervals along the length of each crack. Plate / Surface Vibrators Safety Boots Use concrete materials and proportions with satisfactory records in hot weather; Cooling and/or insulation of the concrete shall be carried out as necessary to maintain the above conditions. 1. The plan should be approved by the engineer before the start of work. The only authorized person to operate any equipment to be used in the project. The line of curved joints shall be within 10 mm of the best fit curved line. No shock of the hose is transferred to the formwork. Concrete compaction shall be done using suitable compaction techniques approved by the Engineer and ensure standby equipment are available at all times. cracks on external wall and side part of the base slab (equal or greater than 0.20mm) Summary of Injection and Repairing for the Wet Cracks: Chief Surveyor 2. Structural precast units shall be stored, handled and transported in a manner that will avoid undue strains, hair cracks, staining, dirt, rust marks, any disfiguration or other damage. We are an independent family run company specialising in groundwork, concrete works, agricultural and industrial buildings. Note: The tolerances on the cover layer measured at any point shall be -0/+10 mm on the above dimensions. 4. d. Fully expose any corroded reinforcement in the repair area and continue until uncorroded steel is reached. V.11.2.11 Wet Cracks V.8.2.2 Hardened Concrete 2. Typical locations to be applied in tunnel structure are as follows: Details of mechanical splices shall be submitted to the Engineer for approval. Less number of joints present in structural system. Spacing shall be closed enough to ensure that the approved material will penetrate along the crack to the next point of injection. V.5.2.2.1 General F. Tie Wires 1.6mm Method Statement for Blinding Concrete Special Safety Requirements a. type and number Re-vibration of concrete is permitted only if the already placed concrete is workable and responds to means of compaction. 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. 1. f. Site specific Risk Assessment shall be briefed to all personnel prior the commencement of concrete works. 4. He also leads the, & 3 IN 1 software first in industry for contractor’s billing. If a specimen shows definite evidence other than low strength, of improper sampling, moulding, handling, curing, or testing, it shall be discarded and the strength of the remaining cylinder shall then be considered the test result. Check if proper access is available. V.5.3.2 Construction Joint Reference V.11.2.4 Honeycomb with rebar not exposed and (<) 50 mm deep V.10 Sampling and Testing The location of concreting. Project Manager 4. Adjustable steel supports and shores shall allow form boards and framework to be accurately adjusted to line and level. Increase potential for reinforcing steel corrosion due to increases cracking. V.5.2.1 General V.9 Precast Concrete Works A computerized copy of the delivery note shall be given to the Engineer’s site representative for each load and completion of concrete pouring time and date shall be updated manually. 5. Pre-cast concrete systems are concrete frames with in-fill panels. 5. Site Planning Such notice shall provide details of the concreting operation including: Baseline Program, All concrete works shall comply fully with the applicable laws, client’s requirements and specification as per Project Specification. 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. e. Pumping of the mixed material should follow immediately after grouting has been carried out. 9. According to the characteristics of a flexible bracket, concrete is cast from a reserved space to the tops of two piers, and then the box girder concrete is cast to middle reserved bottom plates, web plates and top plates. V.11.2.3 Form Tie Rod / Bolt Holes and Voids c. Support to faces is withdrawn progressively as concrete is placed 1. 4. In-situ concrete is often the only appropriate form of construction for retrofit basements under existing properties, due to its relative ease of placement on site. 3.2.2 Importance of In-Situ Concrete Construction ... As regards the cost of concrete, it has been estimated that concrete frames (beams, columns, floors, etc.) 1. 15. Curing shall be followed according to manufacturer’s specifications. Size and location of form windows shall be incorporated in Shop Drawings. c. The equipment operators shall possess the required licenses and certificates Discharge of the concrete shall be completed within 90 min, or before the drum has They should be inserted vertically inside the concrete. 10. Make sure the paste seals around the packer or port. Concrete matched to your requirements - All in-situ concrete components for the building can be concreted using our own WOLF formwork system. 3. V.3.4 Formwork Removal 3. 1. Conduct surveillance and inspection duties at various stages to ensure compliance to QA/QC Plan. 7. QA/QC Engineer The gap between the perimeter formwork should not exceed 150 mm on the pouring side and 50 mm on the opposite side. In no case shall be placed in a slab 125mm or less thickness. Conduct inspection and monitor tests. 8. Contact between concrete materials and fresh concrete with metal surfaces exposed to solar radiation should be minimized. 4. 8. Cast-in-place concrete is a common type of building material for commercial structures and residential homes alike. Special care required against drying winds. 3. QA/QC Engineer a. V.3.1 General Criteria c. The internal faces of the formwork should be sealed, using the approved release agent, to ensure that water is not absorbed from the repair material by the formwork. 1. Summary of Injection and Repairing for the Wet Cracks: 4. Placing of all reinforcement steel bars will be checked by the Engineer and in no case is concrete to be placed around any reinforcement steel that has not been approved by Engineer. HSE Manager The cover shall not be less than mentioned in the approved shop drawing Instructions of the manufacturer are strictly to be followed for storage, transportation and in use of materials. The best fit curved line of curved joints shall be as agreed by the Engineer and shall be within 25 mm of the specified line. 1. After identifying uncontrolled hazards; Contractor will take steps to eliminate or reduce them to an acceptable risk level. 5. In situ concrete slab When the ground conditions are poor, a normal ground bearing slab is unsuitable. 4. Chilling of Water before use (temperature must not be less than 5 degrees) 5. Pre-Start Safety Briefing Arrangements, Method Statement for Plastering – Architectural Finishings – QA/QC Construction, What are Method Statement in Construction Industry and Flowchart & Guide on How to Write the Procedure? 9. b. Banksman, wearing distinctive vests, shall be assigned to help operators maneuver their equipment. J. Waterstops 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. 11. 5. * Column, slab etc. 5. Contractor shall ensure that the formwork is capable of handling operational load, concrete load in addition to its self-weight. All proprietary materials shall be used strictly in accordance with the materials manufacturer’s instruction and/or recommendations. 5. 5. 9. Couplers shall conform to the requirements in BS 5400. c. Each worker will be instructed to follow specific safety requirements related to his trade. n. date & time of completion of discharge Fixing design shall ensure the correct position and fixation of embedded items. V.5.2.2.1 General The upturn to the edge of forms shall be installed with sealant from the top of the membrane to avoid grout runs behind the membrane. V.2 Reinforcement 10. a. SA Site Agent representative from the Lab As with masonry, in-situ walls are most commonly installed as reinforced structures but can be used ‘plain’ (without reinforcement) following guidance provided in the TBIC Guidance Document . 2. 4. Make sure the paste seals around the packer or port. The Concrete supplier shall propose to the contractor mix designs suitable for Hot Weather concreting and undertake all necessary mix trials and testing in conjunction with the contractor and engineer to obtain necessary arrangement. g. Accident reporting requirements. V.5.2.2 Foundation Concreting V.5.1 Preparation for Pour Erection of formwork shall be carried out in close conjunction with project specifications and recommendation of manufacturers. Placing of the following layer shall not be commenced until compaction of the previously placed layer has been completed in the area, where the next layer is to be placed. 4. Remove surface dust & laitance by high-pressure air jetting, The sealant shall be dispensed into the groove as soon as practicable after mixing and within the time recommended by the manufacturer. Temporary supports shall be retained until framing elements braced thereby have attained integral stability in accordance with the design. 6. 6. Mixing and Application Frame & Load Bearing Structure, RCC bands in Load Bearing Structure (Masonry Building), Difference between Reinforced Concrete & Steel Framed Structure. 15. Pre-construction Safety Meetings Staging and bracing shall be done as per approved formwork drawings. Steel Reinforcement The line of straight joints shall be within 10 mm of the best fit straight line. V.2.2 Mechanical Splices f. Coveralls Formwork Release Agent 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. 6. c.  All relevant details of composition, manufacture, strengths and other qualities of the steel. 8. V.8.5 Reducing Heat Gain 3. h. All the required records of concrete delivery should be furnished following ITP. Increase of Water Demand; Helpers/Laborers The surface of blinding concrete shall be smooth and even finish with no sharp projections or abrupt steps, clean and free of loose stones or debris. 3. 6. 3. V.5.2 Placing of Concrete 5. 4. Curing compounds shall not be used on surfaces against which additional concrete or other material is to be bonded unless: 7. All operations from the moment cooled materials are removed from their controlled storage environment (at the beginning of the batching process) to the moment the concrete is placed should be completed as quickly as possible. Holes larger than 10mm diameter using snap ties is not permitted. V.3.4 Formwork Removal One has to meticulous during work with precast concrete because the precast unit can be damaged during transportation and handling. Traffic Controllers would be deployed on both sides in order to control “One-way traffic”. 3. f. The mixed grout should be poured only from one side of the void to eliminate the entrapment of air or surplus pre-soaking water. 9. lifting and installation of heavy elements. V.2.4 Reinforcement Fabrication and Placement The contractor shall ensure that curing shall be done as per approved curing compound. The sheeting shall be returned up the outside faces of the concrete and suitably sealed. Testing of samples shall be in accordance with the Project Specifications following criteria of approved ITP. b. Applicable Codes and Standards In no case, construction joint shall be provided in cantilever member or supporting end of structural member supporting cantilever member. Curing shall be started immediately after removal of formwork for all required surfaces using approved curing compound. 4. The concrete surface shall be sprayed with a fine spray of water or brushed with a stiff brush, just sufficiently to remove the outer mortar skin and expose the larger aggregate without disturbing it. 2. Reinforcement and steel formwork shall be covered to shade it from the sun 24 hours prior to concreting. If works test specimens fail at 28 days, the Contractor shall suspend concreting operations and shall not proceed further without approval. Carpenter Reinforcement cages shall be made up and securely fixed in accordance with the The panels are usually slotted into the frame and can mostly be found in two-storey properties. They shall ensure the reinforcement embedded fittings and forms are kept in position as work proceeds. 4. Any defect in concrete shall be recorded including the severity of defect. Decreased durability from cracking; After successful completion of injection of both stages remove all the packers and surface will be finished by approved material. The contractor shall submit the joint layout before starting the work. Quality Assurance Requirements Table This methodology includes permanent forms, temporary formwork, and falsework  for the structural and architectural cast – in place concrete including form lines, coatings and accessories. 1. Radio Communication system would be used where normal communication is impossible. q. 12. i. 7. For tensile tests, one test piece per 30 ton with at least three test pieces per test unit and nominal diameter. 8. Waterproofing Materials Surface Imperfections 2. Introduction. 3. 11. 5. What is in-situ cast concrete? It shall, however, also be provided with drain holes and plugs. 1. 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. Waterstops 2.Summary of application/injection a. Formwork must comply with the requirements of BS 5975, EN 1992-1-1 and CIRIA Report 136 Formwork Striking Times. The Contractor shall carry out in-situ testing of the suspect, in the presence of the Engineer. Special Safety Requirements 1. हिन्दी (Hindi). Curing Compound Curing materials should also be readily available for prompt protection for all exposed surfaces from premature drying upon completion of the placement. contaminants prior to batching. APPENDIX G: Approved Material Submittals, I. For post cooling systems after the peak internal temperature is reached, including the maximum cooling rate at which cracking will not occur. 7. In hot weather, or under conditions contributing to quick stiffening of the concrete, a time less than 90 min is permitted to be specified by the Engineer. Store Cement and other cementations materials away from moisture above the  ground. XI. d. Adequate measures are taken to prevent contamination of concrete Probable cause: Faulty construction works, firstly in “waterproofing work” and secondly in “through cracks”. The reinforcing bar location shall be marked on the plywood for ease of reference. 2. Cast-in-situ concrete has less strength as compared to precast concrete. Precast concrete wall Precast concrete frame 4. b. 5. Slump tests (and VSI testing when applicable) shall be carried out at the rate of one test per load of concrete delivered to the Site, or one test per 10 m³ whichever is the lesser for the first 50 m³ of concrete then at a rate of 1 slump test for every 50 m³. All samples shall be moulded at jobsite on a leveled surface area to within 20 mm per meter. Concrete Pumps Concrete Vibrators In no event shall the depth of the concrete in one layer exceed 80% of the length of the poker vibrator head, and the layer thickness shall always be determined after considering the compaction procedure. e. The grade of concrete to be poured. Vibration of concrete shall not be applied by way of the reinforcement. 1. HSE Engineer 14. Correct for thermally induced strains or forces. 9. c. Hose must never reach into the concrete. The paste should be forced into the substrate to ensure proper bondage. It should be capable enough to maintain the correct position, shape and profile of structure. e. START Card procurement, design and construction of in-situ concrete frames. Excavation Specification The cement shall be kept below the temperature which there is tendency of false set; 2. Cast-in-place concrete dates back to early experiments by Thomas Edison. The invention discloses a full framing cast-in-situ box girder construction process. 1. b. Steel reinforced concrete is a specific type that has had strong steel rebar or fibers added to it while wet, creating a very strong type of concrete that is able to withstand almost anything when it has dried. In the precast concrete, elements are manufactured in a controlled casting environment and hence it is easier to control mix, placement and curing. All the Structural cracks (cracks more than 0.2mm width) which are beyond the re-bar zone or through cracks larger than 0.2mm width; injection will be carried out by approved material and after successful completion of injection; all the packers will be removed and the surface will be finished by the approved material 11. d. Each crack shall be treated in a single continuous operation and sufficient material shall therefore be made prior to the commencement of the work. Quality control and maintenance is difficult. Use of form coating shall be in accordance with manufacturer’s instruction and shall not leave any stain, discoloration. E. Stainless Steel Dowel N. Structural Concrete b. Conduits or embedded pipes shall be located so as not to reduce the strength of the construction. Summary of Application/Injection 11. Fabrication of reinforcement may be done on site or in the fabrication shop. It will difficult to use high strength concrete as it depends on site condition and resources available. a. it is proven that the curing compound will not prevent bond, or Apply approved material at the bottom of the flange along the perimeter. 6. No foreign material (any kind of material which is not part of concrete) shall come in contact with concrete. For standard repair conditions, thoroughly soak with clean water and remove excess. CONSTRUCT represents approximately 80% of UK concrete frame contractors, dedicated to improving the safety and efficiency of building in-situ concrete frames and associated structures. 4. c. spalled or heat damaged concrete around weldments shall not be acceptable 2. For concrete surfaces to be exposed in the finished structure the use of spacer blocks will not be permitted unless agreed with the Engineer. Probable Cause/s: Insufficient casting interval time, poor vibration There are various types of precast concrete frames such as skeletal frame, H frame and portal frame. 3. in situ concrete frame section construction drawing - Google Search. V.11.2.10 Structural Cracks (cracks > 0.2 mm), Deep-seated cracks (beyond rebar Banksman 3. 7. Formwork – Geometry Buffer zones and working areas will be cordoned with highly reflective traffic cones/barriers to separate the survey team and workers from the main traffic flow. The minimum tensile yield strength for all reinforcing steel bars shall be 500 MPa with a minimum modulus of elasticity of 190 MPa. The contractor shall ensure that the time between the placing of different lifts or layers of concrete is short enough to prevent the formation of cold joints. Topics, you have to be confirmed and verified by site Engineer and ensure equipment. 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