supervision of concrete construction. [electronic resource]

[...]... within the Bill of Quantities for the provision of sample panels of sufficient size to allow the establishment of what is an acceptable standard With regard to the specification governing concrete, the supervisor will be concerned with the problems of achieving not only quantity of concrete output, but also with the maintenance of quality and accuracy The specification may, in the case of method-type... facilities Trends are towards the use of BS 5328 in specification of concrete There will be items in the Bill to cover the cost of trial mixes in establishing appropriate concrete to meet strength criteria The supervisor must ensure readymixed concrete has been approved and should check the status of the supplier in terms of acknowledged Quality Assurance schemes 9 10 Storage of materials Appropriate sums... by ease of planning and economies achieved through careful resource allocation 18 Programme charts which show each operation commencing on completion of a previous activity are evidence of lack of understanding of work content and pattern of construction Equally, charts indicating a large number of discrete operations are not generally helpful, nor are charts containing a mass of details of meaning... supervisor should be aware of the recommendations of BS 8110 (CP 110, CP 114, CP 115 and CP 116) regarding the accuracy of location of the steel reinforcement within the concrete section with particular reference to the less obvious requirements of end cover and the maintenance of location and stressing ducts within specified limits Drawings and details prepared by the contractor As part of the contract procedure... scaffolds, and so on, and which are, of course, vital to the supervisor in the performance of his own tasks Apart from the general site and plant layouts produced by the contractor, the most critical site detail is probably that of crane layout Here the concrete supervisor must be aware of the implications of location of the crane relative to the most critical sections of his works Crane layout will undoubtedly... produces a form of method statement which relies on a sound assessment of timing and sequence of the construction operations This method will be adopted once the contract is secured and, whilst the overall programme and construction time established is a matter of policy and the province of senior management, much of the short term planning of operations must be instigated by site management and supervision. .. sequence of operations, determining crane movements and similar details which are difficult to visualise Simple block models of each lift or bay of a complicated structure are helpful in all aspects of planning and allow discussion of problems with all concerned Steel reinforcement details and schedules The structural drawings for the concrete element of the contract will indicate the exact location of all... instant rescheduling and provide a dynamic source of management information These days networks are frequently used as part of the contract documents 22 Line of balance The technique employed in line of balance planning and programming is that of plotting projected outputs against time Line of balance techniques allow the best of outputs for each section of the construction task to be achieved and the... head, as it were) the activities of a small team of operatives or the activities of several trades involved in a particular task Line of balance techniques formalise these arrangements and allow them to be set down, manually or by computer, in such a way that a clear picture of relationships and dependencies emerges A simple form of line of balance is used in the preparation of transport timetables, where... propose means of determining reduced striking times (through accelerated curing, strength assessment, maturity and so on) Further specification clauses covering placing and compaction, curing and protection of concrete, and so on, are dealt with in greater depth elsewhere in this publication Bill of Quantities Produced by professional quantity surveyors, the Bill of Quantities forms a part of the contract . Prestressed concrete 73 Concrete for prestressing 74 Fire resistance of prestressed and reinforced concrete 75 Lightweight concrete 77 Air-entrained concrete 77 6. Supervisory skills 79 The role of. Efflorescence and lime bloom 305 Points of supervision 306 BibliographyÐVolume 1 307 viii Author's note Of necessity, a publication such as Supervision of Concrete Construction, takes some years. number of facets of concrete construction with which the supervisor will become involved when he undertakes decision-making in the planning and execution of concrete work. Where possible, the use of