What is the significance of ten percent fines value in testing sub-base material?Posted in Highway Engineering | Email This Post |
Ten percent fines value is a measure of the resistance of aggregate crushing subjected to loading and it is applicable to both weak and strong aggregate. Fine aggregates are defined as those passing 2.36mm sieve.
The test aims at looking for the forces required to produce 10% of fine values (i.e. weight of fines aggregates/weight of all aggregates = 10%). This test is very similar to Aggregate Crushing Test in which a standard force 400kN is applied and fines material expressed as a percentage of the original mass is the aggregate crushing value.
Granular sub-base is subjected to repeated loadings from truck types. The stress level at the contact points of aggregate particles is quite high. The sub-base in pavement is a structural layer used for distribution of traffic loads into larger area. As such, it is of paramount importance that the sub-base material should itself not be disintegrated under severe traffic loads. Ten percent fines value can be used to reveal the aggregate
properties when subjected to mechanical degradation.
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.