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Civil - Highway Planning and Alignment - Highway Construction Materials And Practice

Highway Construction: Shape tests

   Posted On :  25.07.2016 12:40 pm
Highway Construction: Shape tests

The particle shape of the aggregate mass is determined by the percentage of flaky and elongated particles in it. Aggregates which are flaky or elongated are detrimental to higher workability and stability of mixes.

Shape tests

 

The particle shape of the aggregate mass is determined by the percentage of flaky and elongated particles in it. Aggregates which are flaky or elongated are detrimental to higher workability and stability of mixes.

 

Flakiness gauge

 

The flakiness index is defined as the percentage by weight of aggregate particles whose least dimension is less than 0.6 times their mean size. Test procedure had been standardized in India (IS:2386 part-I).


Elongation  gauge

 

The elongation index of an aggregate is defined as the percentage by weight of particles whose greatest dimension (length) is 1.8 times their mean dimension. This test is applicable to aggregates larger than 6.3 mm. This test is also specified in (IS:2386 Part-I). However there are no recognized limits for the elongation index.

 

Tags : Civil - Highway Planning and Alignment - Highway Construction Materials And Practice
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