Given the particle size distributions of two aggregates and the required limits of particle size distribution for the mix, determine a suitable ratio for blending the two aggregates to obtain an acceptable combined aggregate.
What will be an ideal response?
Observation of the results of the sieve analysis indicate that aggregate A appears to more closely conform to the required mix for most sizes; therefore, the initial mix design should contain more than 50% aggregate A. The initial trial will be 70% aggregate A and 30% aggregate B. The following table shows the sieve analysis data and the computations required to obtain the required gradation.
The proposed design (70% aggregate A and 30% aggregate B) is acceptable.
Note that other combinations are also possible.
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