By John Newman, B S Choo
BBased at the Institute of Concrete Technology's complicated path, the Advanced Concrete know-how sequence is a entire academic and reference source for the concrete fabrics technologist. knowledgeable foreign crew of authors from examine, academia, and have come jointly to supply this specific reference resource. this primary quantity bargains with the constituent fabrics of concrete. With labored examples, case reviews and illustrations all through, the ebook can be a key reference for the concrete expert for years yet to come. * specialist overseas authorship guarantees the sequence is authoritative * Case experiences and labored examples support the reader observe their wisdom to perform * complete insurance of the topic supplies the reader all of the important reference fabric
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Additional info for Advanced concrete technology
22). 22). 9) are assumed constant over the full range of cement contents for a given maximum size and type of aggregate (crushed or uncrushed) and level of consistence. 22 Assumed relationships between strength at 28 days and free w/c for concretes made with CEM I Portland cement to BS EN 197–1 (adapted from DoE, 1988). 4. 9 Assumed effective water contents of concrete made with uncrushed aggregates Maximum aggregate size (mm) 10 20 40 Effective water (kg/m3) Target Slump (mm) 25 50 75 100 185 165 145 205 180 160 215 190 170 220 195 175 Note: Add 25–40 kg/m3 for crushed coarse and fine aggregates.
Not surprisingly, with all the different purposes, methods and aspects that may need to be covered, a wide range of solutions needs to be available, some of which will be purpose-made to suit the requirements of specific sectors of industry or individual companies and for particular applications. For example, a ready-mixed concrete producer needs to have a large number of accurate mix designs ready for immediate use to cater for ‘same-day’ orders. Because of the large amount of test data being accumulated, the producer can utilize this information to develop and update the designs routinely within a control system.
4 Single relationship is assumed between strength and w/c for a given cement type and for all aggregates. If the relationship is nationally safe it will usually be uneconomic for large-scale production. There are two simple rules which are completely valid and are applicable to all methods of mix design. 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).