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Published in:
2019 | OriginalPaper | Chapter
4. Proportioning of Concrete Mixes
Author : Akhtar Surahyo
Published in: Concrete Construction
Publisher: Springer International Publishing
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Abstract
Concrete mixtures are proportioned to have required workability and to assure that the hardened concrete will have the required properties. A concrete mix having excessive coarse aggregate lacks sufficient mortar to fill the void system, resulting in a non-cohesive and harsh mix. On the other hand, excessive amounts of fine aggregate will increase the cohesion and the mix will turn sticky and difficult to move. High-cement-content mixes are generally sticky and sluggish, whereas the lower w/c ratio reduces the workability of rich mixes. Hence, it is important that the concrete proportions should be selected to provide suitable workability, density, strength, and durability for the particular application at the lowest cost.
This chapter provides information on British mix design method based on Building Research Establishment (BRE) Ltd., and ACI mix design method in conformance with the general requirements of ACI-211.1, with examples.