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What proportion of soft aggregates to soil gives the best result?

What proportion of soft aggregates to soil gives the best result? Correct Answer 1:2

The soft aggregates are weak in taking strength, impact and crushing imposed by the heavy loads. So, using mechanical stabilization, it is mixed with soil to make it perform better. The best proportion for the same has been found out as 1-part soft aggregate to 2-parts soil.

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