The size of coarse-grated aggregates is the main factor in determining the strength of concrete. In general, you'll want smaller coarse-grated aggregates for stronger concrete, with 20mm aggregates meeting the threshold for strong concrete and 40mm aggregates for normal strength concrete. Since fine aggregates are used to fill the voids of coarse-grained aggregates, the smaller the coarse-grained aggregates, the finer the fine aggregates should be. Increase the workability of concrete.
According to size, coarse-grained aggregate is described as graded aggregate of its nominal size, i.e., for example, a graded aggregate of nominal size of 20 mm means an aggregate, most of which passes through a 20 mm IS sieve. A coarse-grained aggregate having the particle sizes that mainly belong to a single sieve size is known as a single-size aggregate. For example, a single size 20 mm aggregate means an aggregate, most of which passes through a 20 mm IS screen and most of which is retained on a 10 mm IS screen. It is the aggregate composed of fine aggregates and coarse-grained aggregates.
Depending on the size, everything in aggregate is described as integral aggregates of its nominal size, that is, for example, everything in aggregate of nominal size of 20 mm means an aggregate, most of which passes through a 20 mm IS sieve and also contains fine aggregates. You can connect me on Google +. To know more about me, visit AboutMe Very easy and very simple explanation, thank you What to add from calassfy depending on the source It is very useful and simplified thanks Help me with a report of the type of aggregate, and its sizes Help me with the types of aggregates, their size and use I want you to help me with the type of aggregates, how they are produced and their sizes Define the size and shape of the aggregate Thanks for the article, it was useful. ASTM C136 — Standard Test Method for Fine and Coarse-grained Aggregates Save my name, email and website in this browser for the next time I comment.
Notify me of new publications by email. Enter your email and receive new publications. In your contract, construction or purchase agreement, the term “maximum aggregate size” refers to the smallest sieve that 100% of your aggregate can pass through. Keep in mind that the size of the aggregates is the size that most parts pass through a sieve of that size, not all, so there is no need to be too demanding.
In a mass concrete job, the use of larger aggregates will be useful due to the lower cement consumption. In large aggregates, the surface area to be wetted per unit weight is smaller, and the water-cement ratio is lower, which increases the strength. But in practice, the size of the aggregate cannot be increased to any limit due to limitations in mixing, handling and placing equipment. To obtain the same strength or workability, concrete with large aggregate will require a smaller amount of cement than concrete with a smaller aggregate size.
Leveling limits and maximum aggregate size are specified because these properties affect the amount of aggregate used, as well as cement and water requirements, workability, pumpability, and concrete durability. When specifying void graded aggregates, certain particle sizes are omitted from the aggregate of the size continuum. It may be necessary to select the overall size to accommodate this rate or accept that the service life can be reduced if a lower rate is used. Integral aggregate, similar to the one in its name, is an aggregate that contains a proportion of material of all sizes of a well, crushing plant or river bed.
In such cases, a corrective treatment using a 5 or 7 mm aggregate, or a microsurface, can provide a more uniform surface texture that can subsequently be resealed with a larger aggregate size. .
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