Standards Development

Scope

This European Standard specifies a method for the determination of the percentage of particles with crushed and broken surfaces in a sample of natural coarse aggregate. It applies to gravel or mixed aggregate containing gravel. The test method specified in this part of this European Standard is applicable to particle size fractions di/Di where Di <= 63 mm and di >= 4 mm.

Purpose

The main technical changes in this version are:

a) The title has been revised to better reflect the scope;

b) Clause 3: The definition of a crushed surface has been changed. The definitions of aggregate size and a rounded particle have been deleted. The definitions of gravel and a rounded surface have been added;

c) Clause 4: Principle has been amended;

d) Clause 5.3: An alternative temperature has been added for the ventilated oven;

e) Clause 6: Preparation of test portion has been revised;

f) Clause 7: Procedure has been amended;

g) Clause 8: Calculation and expression of results has been amended;

h) Clause 9: The lists of required and optional data have been updated;

i) New informative Annex A, with guidance for estimated mass of the test portion, has been added;

j) New informative Annex B, with example of application of the test procedure, has been added;

k) Previous Annex A, with example of a test data sheet, has been revised and moved to Annex C.