A new idea about the gradation of aggregates

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Amro Shalaan

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The sieve analysis test is very important for the mix design calculations . It`s one of the periodic tests which must be made in any batching plant because the aggregates gradation is one of the most important factors affecting the workability and homogeneity of the produced concrete .

In this post i will discuss an idea in this field to evaluate the coarse aggregate gradation without sieves or balance or any physical effort, the idea which can be a mobile application for fast determination of the coarse aggregate gradation, this idea depending on approximation the coarse aggregate particles sizes relatively by using a known particle size (reference particle). In the attached sketch drawing the ruler with length (na) besides a row of aggregates particles with lengths (n1,n2,n3) respectively.

Assume that the average length is (nv), then:  

nv = na/3 ≈n1≈n2≈n3                                                                                                           (1)

The accuracy of equation (1) increases when the lengths (n1,n2,n3) are approaching to each other or the ruler length (na) at minimum length possible and this is the idea, when we assume that the ruler length (na) approximately equal to the biggest sieve size for this aggregates (Say 3.7 to 4cm in case of agg1 and agg2) and this is the mentioned reference particle .

Now to use this method practically and to know the details, please see the attached link

https://www.academia.edu/43760539/Aggregates_gradation_by_tracks_method


 
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