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Size: 0.46 MB | Format:PDF | Publisher: Cement & Concrete Association of New Zealand | pages: 18 | ISBN: 0908956169
Performance specifications can provide clarity on the outcome expected. In response to these and other views, a focus group / working party was established to develop guidelines for the use of performance-based specifications for concrete. The group intended to produce model specifications and guidelines for the use of performance-based specifications for marine concrete and for concrete floors, but the technology involved is complex and still evolving, and consequently such documents could be both unwieldy and quickly outdated. Instead, this document has been prepared to describe the present capabilities and limitations of performance-based specification, and to provide relevant references for readers who may wish to adopt a performance-based approach to specification.
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Author: Teychenné, D. C., Franklin, R. E. and Erntroy, H. C. | Size: 1.25 MB | Format:PDF | Publisher: BRE | Year: 1997 | pages: 46 | ISBN: 9781860811722
The method of concrete mix design described in this publication is the same as that used in the first edition, which was published in 1975 and revised in 1988 . In this second edition, minor amendments have been made to allow for changes in the terminology and properties of the materials used.
The basic procedure for this mix design method is applicable to concrete for most purposes including pavements which are specified by compressive strength. The basic procedure is restricted to designing concrete mixes to meet workability, strength and durability requirements using Portland cements and natural aggregates, or coarse air-cooled slag. It has been found possible to add a new modification to allow the method to be applied to mixes incorporating pulverised-fuel ash (pfa) or using Portland pulverised-fuel ash cement. Guidance is given on the design of mixes incorporating ground granulated blastfurnace slag (ggbfs) or using Portland-blastfurnace cements. The general principles and basic concepts are given in the Introduction. After this the publication is divided into three parts. Part one gives the background information which is required to understand the mix design procedure. Part two describes the mix design process and contains all the basic information in the form of tables and graphs for the application of the method to most concretes designed for compressive strength. A standardised form has been developed for use with this method, and a number of worked examples is given. Part three deals with modifications to the mix design method to deal with air-entrained concrete, and for the design of mixes incorporating pfa or ggbfs.
Second edition amended by B. K. Marsh.
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In the case that a footing is overloaded just like in the situation that new stories are added to an existing building,to account for the Soil's bearing capacity properties the area of the footing is increased by casting the required additional contact area so that the bearing Capacity will check.
Ok,now that we enlarged the contact area,dowels should be provided between the old and new parts of the footing to make sure they Two parts work together.
Can anyone please tell me how can I calculate/assign these dowels?what are the criteria to meet?
Steel Building Systems “Yesterday and Today” (Power Point) by Prof. R. Schuster
Director Canadian Cold Formed Steel Research Group
University of Waterloo, Waterloo, Ontario, Canada
-17,8 MB
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