Soil mechanics - Mention two desirable characteristics of aggregate shape? - Wha

Question

Soil mechanics - Mention two desirable characteristics of aggregate shape? - What term would be given to an aggregate having length and width dimensions approximately equal, but six times larger than particle thickness? - If you measure the bulk and apparent specific gravities of an aggregate sample, which one should be higher and why? - A fine aggregate angularity test is run on 2 aggregates with identical specific gravities. After running the test, the weight of the material in the cylinder is 140 gram for Aggregate A and 150 gram for Aggregate B. Which aggregate is expected to have better rutting resistance? Briefly explain.

Explanation / Answer

desirable characterstics of aggregate shapes:

The size and shape of the aggregate particles greatly influence the quantity of cement required in concrete mix and hence ultimately economy of concrete. For the preparation of economical concrete mix on should use largest coarse aggregates feasible for the structure.

Maximum size of aggregate should be less than

Remember that the size & shape of aggregate particles influence the properties of freshly mixed concrete more as compared to those of hardened concrete.

2. angular aggregates is term given to aggregates having same length and width but six times greater than particle size

these aggregates have sharp edges

3. value of apparent specific gravity value will be more

Apparent specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance. The reference substance is nearly always water at its densest (4°C) for liquids; for gases it is air at room temperature (21°C).

while measuring bulk specific gravity it was measured in distilled water where bouyancy force acts in upward direction so value w gets lower hence bulk specific gravity will be low

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