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For optimal length of fiber additive, both types of fiber reinforced cement soft clay reached their maximum strengthwhen mixed with fibers of the longest lengths, with an accelerating growth rate. Therefore, it can be estimated that the optimal fiber lengths are probably higher than what the authors have tested. When the improved clay were mixed with the same content of fibers or fiber bundles, the inclusion of longer length fibers means that fewer single fibers will be mixed. Less single fibers will result in an even distribution of fibers. Longer fibers are hard to be pulled out and can bond more soil particles together. Therefore, considering the magnitude of the ground as well as what the authors haveanalyzed above, the optimal lengths of the two fiber additives should be much longer in practice.
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