Water Time, date and name of individual 3. The most common use of the term ' in situ ' is in relation to concrete, with components such as a slabs, beams and piles being described as ‘cast in situ ’ to distinguish them from precast concrete components, that are manufactured off site. Operating Procedures 1. a. type and number Height of each pour shall be limited to 400mm to ensure proper compaction of concrete. Stainless steel dowel bars shall be grade 1.4401 (316) or equivalent when required at the movement joints. d. If placing by the pump, the pipeline should be ‘grouted’ with a rich cement slurry or mortar, discharging such grout as waste. Wholistically, it forms a structural skeleton for the building which is used to support other members such as Floors, Roof, Walls, and Claddings. All steel reinforcement to be used shall be from an approved manufacturer. 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. Supervision and Monitoring Arrangements 1. i. All Void forming material shall be expanded polystyrene with properties referring to Project Specifications. b. 2. removed. A carpenter construct, erect, install and repair structures and fixtures of wood, plywood, and wallboards using carpenter’s hand tools and power tools. Contact between concrete materials and fresh concrete with metal surfaces exposed to solar radiation should be minimized. Relevant information, warning and mandatory signs such as Narrow Road Signs, One- Lane Traffic signs, etc. V.11 Concrete Repair It will difficult to use high strength concrete as it depends on site condition and resources available. 14. It shall not strike the formwork between the point of its discharge and its final place in the work, and except by approval of the Engineer, it shall not be dropped freely through a height greater than 1.5 m. Specimens shall not be transported or handled until at least 8 h after final set. 9. b. 3. 4. 16. i. HSE Engineer 10. Reinforcement Priming 2. Hybrid concrete construction is a method of construction which integrates precast concrete and cast in-situ concrete to make best advantage of their different inherent qualities. Reinforcement shall be either delivered cut and bend by the approved subcontractor in compliance with approved shop drawing and Bar Bending Schedule or it may be cold-bent at the site. For each upper layer, allow the rod to penetrate through the layer being rodded and into the layer below about 25 mm. 2. Cubes shall be numbered consequently and marked: Grooves in the exposed concrete shall be formed by attaching tapered planed timber battens. In case of narrow section, form windows shall be provided as described by the Engineer following approved shop drawings. greater than (>) 0.20mm, but ( 0.2 mm), Deep-seated cracks (beyond rebar Summary of Application/Injection The Surveyor shall prepare the layout by establishing the required elevation such as slab soffits, elevation of top bars, top of slab, etc. When the ground conditions are poor, a normal ground bearing slab is unsuitable. V.5.2.4 Mass Concreting 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. zone) or through cracks larger than 0.2 mm Attention to full and proper preparation of the substrate is essential for complete repair adhesion. V.5.3.4.4 Sealing Joints h. General management of protection/operation hazards is to be observed. V.11.2.4 Honeycomb with rebar not exposed and (<) 50 mm deep b. d. If multiple lifts with time delay are proposed, provide lift height and define time delay between lifts. 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. It may be necessary to break out the concrete beyond the original repair area in order to achieve this. Construction joints in slab and beam shall be provided at 1/3 or ¼ of span subject to a maximum spacing of approximately 9m. 1. Plant and Equipment section of Gharpedia. Reinforced Concrete Frame Construction risk, such as Latin America, southern Europe, North Africa, the Middle East, and Southeast Asia. 7. d. Safety Goggles 6. Risk Assessment and Job Hazard Analysis Several hours prior to placing the approved substrate primer, the prepared concrete substrates should be saturated, by filling the formwork. All exposed concrete corners and edges shall have 20mm x 20mm chamfers. d. Contractor Safety Team will perform hazard risk analysis by identifying all steps, hazards identified in those steps, with a focus on the relationship between the work task, the tools and the work environment. References 3. Definitions 3. HPC Frames are a specialist Company involved in all areas of in situ reinforced concrete construction from concrete frames, including substructures and slipforming, to bridges and … V.9 Precast Concrete Works V.10.3 Testing of Concrete Cube Samples The centers should be 1 -1.5 times the depth of the crack, but not more than 300mm. commence each pour. Precast concrete is the new construction technic that makes construction speedy and economical on the large construction projects. For member penetrations larger than 150 mm, coring or field cutting is not permitted unless approved by the Engineer. Precast Specialist Specification Columns at ground level will be constructed on a pile cap, edge beam or some other type of foundation. APPENDIX G: Approved Material Submittals, I. 7. 4. reinforcement detail drawings to provide adequate rigidity and to ensure that the specified cover and fit within the mould are achieved. d. Any bolt pockets must be grouted prior to grouting between the substrate and the base plate. 12. The steel bars should be cleaned to a uniform bright condition, and the edge of the repair should be ‘roughened’ to provide a good mechanical key at the substrate interface; 13. 9. Vertical joint shall be provided as per Section V.5.3. The formwork shall be carefully stripped to avoid sudden shocks from the removal of wedges or vibration which might cause damage to the concrete. V.11.2.1 Crazing All connection shall be applied with sealant to minimize bleeding of concrete during pouring. This method statement defines the sequence and describes the control procedures to be followed for concrete work of Project xxxxx (Name of Project goes here). The curing compound shall not be applied if bleed water is forming or is present on the concrete surface. The QA/QC Engineer shall monitor whether the installation works is conforming to the required quality otherwise he shall notify the Site Engineer should he found non-conformance to the ongoing activities. Cast-in-situ foundation Cast-in-situ wall 7. In the case of vertical cracks work shall start from the bottom of crack and work upward. c. Fully expose any corroded reinforcement in the repair area and continue until uncorroded steel is reached. These limits will be checked using CIRIA 660 report when conducting the risk of thermal cracking analysis for each element at early age. 2. b. Form work for In-situ concrete pouring. Site Planning All waste shall be disposed as per Construction and Environmental Management Plan, ref. 1. S. Concrete Repair Materials 3. Total construction time is less as compared to cast-in-situ. During the concreting process like mixing, transportation, placing, finishing etc. Notwithstanding the requirements of this Section for the removal times for formwork, the following provisions shall apply to an early loading of concrete. d. Grout shall be pumped through for initial lubrication. 7. P.E. Before repairing any defect, the Engineer shall approve the repair procedure referring to suggestions made in section V.11. They ensure safe environmental working conditions for all employees. cracks on external wall and side part of the base slab (equal or greater than 0.20mm) 9. Deliver sealants in the manufacturer’s original unopened containers. 3. 16. Limits of the repair geometry should be in accordance with that laid down in the Design criteria’ section of the approved product data sheet. V. Methodology Transit Mixers and Accessories 6. Care shall be taken to avoid oil/coating on reinforcement and if found shall be removed before concreting. VII. It will difficult to use high strength concrete as it depends on site condition and resources available. A minimum of one sample shall be taken of each mix every day the mix is used. Excavation Specification Concrete shall not be placed on both sides of movement joint at the same time unless otherwise approved. Theoretically, all joints between the precast concrete units can be made in such a way that the completed precast structure has the same monolithic concept as a cast-in-situ structures. 6. Attention to full and proper preparation of the substrate is essential for complete repair adhesion; It can be defined as the ability of a material to … Fixing details of embedded items shall be submitted before commencing the work. Pre-cast concrete systems are concrete frames with in-fill panels. Formworks The cement shall be kept below the temperature which there is tendency of false set; It has many advantages over the cast-in-situ concrete method for construction. Details, methods of design and uses of precast concrete frames are discussed in this article. 7. Traffic Controllers would be deployed on both sides in order to control “One-way traffic”. 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. The end of the hot weather period shall be defined as the period when the maximum air shade temperature is below 35 degrees on three consecutive days. 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. No foreign material (any kind of material which is not part of concrete) shall come in contact with concrete. c. Hose must never reach into the concrete. 1. a. Transportation delivery and handling shall be in accordance with the requirements of BS8500 and BS EN 206-1. For concrete surfaces to be exposed in the finished structure the use of spacer blocks will not be permitted unless agreed with the Engineer. 11. n. date & time of completion of discharge It is the ideal structural material, in … 4. The Surveyor shall monitor levels, verticality, and alignment of structure throughout the work. “One Way traffic ahead” signboards would be placed 90 m ahead of working area in order to notify incoming drivers of the new road layout. He is a senior editor at GharPedia and, core member of Editorial Team, & senior manager at SDCPL (Civil Eng.). Determine and report any non-conformance and recommended corrective actions. V.8.3 Concrete Placing and Curing 4. How to Choose the Perfect Doors for Your Home? Only approved material for joint filler and joint sealants shall be used. (Or this item number 2 will be based upon the steel requirement stated from the Project Specifications) Modern Methods of Construction (MMC) – … V.5.3.4.1 Forming Joints 3. 30 to 40 mm wide and 2 to 3 mm thick. The principal feature of the flat plate floor is a uniform or near-uniform thickness with a flat soffit which requires only simple formwork and is easy to construct. The spacers will be as per BS8110-1, Clause 7.3 and BS 7973. 5. e. type and duration of curing Haulage distances should be kept to a minimum. Where preparation techniques result in voids of greater than 10 mm depth, alternate method and material shall be used as approved material data sheet. 7. R. Formworks p. Maximum W/C ratio necessary for the competitiveness of in-situ concrete and essential if the construction industry is to move forward. e. All dirt and debris to be removed from the grout area before the last piece of formwork are fixed, to facilitate pre-soaking. The maximum temperature of concrete at the point of placing shall not be more than 32 °C. In no case shall be placed in a slab 125mm or less thickness. 2. It is advisable where practical to have no gap at the flank sides. Drill 10mm dia. High strength concrete can be used because it is in controlled condition. 4. Details of the source and suppliers of each type of coupler shall be submitted to the Engineer for agreement and approval. Adjustable steel supports and shores shall allow form boards and framework to be accurately adjusted to line and level. Identify the nature of the crack and investigate the extent and magnitude of the crack, follows procedure outline below for injection method treatment. 1. HSE Officer 2. 1. 15. j. Inspection, Test, and Sampling constituents is not occurring. Waterproofing Materials V.5.3.1 General 4. The ends of all tying wires shall be turned into the main body of the concrete and not allowed to project towards the surface. 3. 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. Exposed waterstops shall be protected from exposure to conditions which may affect the waterstop and shall be kept free from rust, hydrocarbons and other deleterious material. G. Formwork Release Agent 10. Ensure that all personnel is aware of the quality requirement. QA Documentation Appendix C: Permit to Work 1. Reinforcement not exceeding 12mm in diameter which projects from the face of unit may be bent to facilitate the casting or demoulding of the unit subject to agreement for each case. b. V.3.2 Material and Class of Finish 6. QA/QC Engineer If works test specimens fail at 28 days, the Contractor shall suspend concreting operations and shall not proceed further without approval. Where slabs, beams and walls incorporate construction joints, panels shall generally be constructed consecutively. Approved spacers shall be installed prior to install the formworks. M. Blinding Concrete Preparation Before placement of the structural precast elements, the Contractor shall survey and maintain all temporary supports shown or required to control alignment and deflection. 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. 3) It is easily used for two way structural systems. e. The grade of concrete to be poured. 5. Contractor shall ensure that dumping of excess concrete on-site is not permitted and no concrete wash-out must take place on site. a. 12. 5. Internal surface of external walls; If curing compound/membrane is used, they shall be compatible with the repair products. In precast concrete construction, details at the joint become very critical and needs careful attention. The sealant shall be dispensed into the groove as soon as practicable after mixing and within the time recommended by the manufacturer. Information to Personnel f. Coveralls 11. a. Land Surveyor b. 4. The formwork itself must be constructed to be leak proof, to prevent any possible grout loss. m. arrival and departure date & time of truck The contractor shall employ effective means such as pre-cooling of aggregate and mixing water, as necessary, to maintain the temperature of the concrete. e. The project safety officer is responsible along with the project zone site engineer for ensuring that all operations are carried out with due regard to the safety of all project personnel & property. The final level of excavation will be trimmed, cleaned, thoroughly compacted and Particular care should be taken during removal of formwork so that it shall not cause shock, disturbance or damage to concrete. 14. Maintain all plant clean and with suitable reflective surfaces and heat insulation as relevant. a. 4. In-situ Concrete. greater than (>) 0.20mm, but (<) 0.5mm Reference Documentation 7. Expected date and size of deliveries to site 2. Re-inject with approved material, injection pressure should be as mentioned in manufacturer’s product. The temporary opening shall be provided for inspection and for removal of water and shall be sealed before placing concrete. This paper explores various stakeholder views on the reasons for adopting a particular solution, and the particular challenges associated with the use of hybrid concrete. Pre-Soaking Inspect and review projects to monitor compliance with building and safety codes and other regulations. This can be achieved by using foam rubber strip or mastic sealant beneath the formwork, and at any joints in the formwork. V.8.2.3 Avoiding Potential Problems Plastic Spacers General Lifting Plan f. Roles of the contractor, subcontractors, authority representatives and all project workers. 3. a. b. 2. 5. Prior to commencing any large pour concrete placement (generally > 1m section), the Contractor shall submit a Thermal Control Plan to the Engineer for approval for each mass concrete structure component. Dewatering, 6. 2. Specimens shall be protected from direct sun or rapid evaporation and placed on cushion layer to reduce vibration. It may be necessary to provide air pressure relief holes to allow venting of any isolated high spots; It may be necessary to break out the concrete beyond the original repair area in order to achieve this; 2. Attachments Curing shall not take place until all material related to subjected curing (e.g. e. Calculations or experiments showing that the dry bulb temperature of the placed V.5.1 Preparation for Pour Site Engineer c. Superintendents Notices/Memos Ensure enforcement of safety procedures in accordance with the approved HSE Plan. Check if proper access is available. 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