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By John Newman, B S Choo

ISBN-10: 0750651032

ISBN-13: 9780750651035

BBased at the Institute of Concrete Technology's complex path, the Advanced Concrete expertise sequence is a finished academic and reference source for the concrete fabrics technologist. knowledgeable foreign staff of authors from study, academia, and have come jointly to provide this designated reference resource. this primary quantity offers with the constituent fabrics of concrete. With labored examples, case reports and illustrations all through, the e-book could be a key reference for the concrete expert for years yet to come. * specialist foreign authorship guarantees the sequence is authoritative * Case experiences and labored examples aid the reader practice their wisdom to perform * accomplished assurance of the topic supplies the reader all of the useful reference fabric

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These are: 5 The sum of the weights of materials per cubic metre equals the plastic density. g. cement (C), aggregate (A) and water (W), and if the quantities of any two of them, together with the plastic density (PD), are either known or assumed then the third can be calculated by difference: (PD) kg/m3 = (C) + (A) + (W) Note: (W) is effective water and (A) is in the saturated and surface dried conditon (SSD). 6 The sum of the volumes of materials per cubic metre is unity. This is only of value if the relative density of each material is known, when air (%) (C) ( FA ) ( CA ) (W ) + + + + =1 RDC × 1000 RDFA × 1000 RDCA × 1000 1000 100 where (W) is the volume of effective free water in litres (= weight in kg), (C) is the weight of cement, (FA) and (CA) are respectively the weights of fine and coarse aggregates in the SSD condition, RDC is the relative density of the cement and RDFA and RDCA are the relative densities on a saturated and surface-dried basis (SSD) of the fine and coarse aggregates respectively.

2 Initial laboratory tests of concrete There are a number of factors to keep in mind when preparing for, and making, initial tests. 1 All materials should be as representative as possible of those to be used for the construction. e. usually wet, in the case of aggregates. Although greater accuracy may appear to be obtained by oven-drying, use of wet aggregates and allowing for moisture content may be preferable to making assumptions concerning absorption by dry aggregates of water from the concrete mix.

For flowing concrete see Neville (1995, pp. 757–8). g. admixture manufacturers. 7 Simplified mix design methods Two methods are considered under the heading of simplified methods • DoE (1988) • ACI (1991). 1/31 Concrete mix design These two methods are outlined to show the main principles adopted. A third method, for medium-strength concretes only, and possibly still in wide use, is the Basic Mix Method of Owens (1973) to which readers are referred, by which a single mix is first designed using a data bank provided.

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Advanced concrete technology by John Newman, B S Choo

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