This test covers the diversity in size of aggregates. A typical sieve analysis determined according to BS requirement.
Test Method : BS EN 933 - 1 : 2012
Flakiness & Elongation Index
Aggregate particles are classified as elongated when they have a length (greatest dimension) of more than 1.8 of their mean sieve size, this size being taken as the mean of the limiting sieve apertures used for determining the size fraction in which the particle occurs. The elongation index is found by separating the elongated particles and expressing their mass as a percentage of the mass of sample tested. While the flakiness index sample is found by separating the flaky particles and expressing their mass a a percentage of the mass of the sample tested.
This test covers three (3) methods for the determination of the moisture content using oven-drying method, high temperature method, and microwave-oven method for fine aggregate only.
Test Method : BS 812 Part 109 : 1990
Materials Finer than 75µm
Decantation Method. This method determines the amount of material passing 75um test sieve.
Test Method : ASTM C 117 - 04 (Procedure A)
Fractured Face Value
Organic Impurities in Fine Aggregate (Colour Plate Method)
The principle value of this test is to furnish a warning that injurious amounts of organic impurities may be present. When a sample subjected to this test produces a color darker than the standard color, it is advisable to perform the test for the effect of organic impurities on the strength of mortar.
Aggregate Crushing Value (ACV)
This test determines the Aggregate Crushing Value (ACV) which gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. The degree is assessed by a sieving test on the crushed specimen and is taken as a measure of the ACV.
A test specimen is compacted, in a standardized manner, into an open steel cup. The specimen is then subjected to a number of standard impacts from a dropping weight. This action breaks the aggregate to a degree which is dependent on the impact resistance of the material. This degree is accessed by sieving test on the impacted specimen and is taken as the aggregate impact value (AIV)
This test covers the determination of the percentage, by mass or by count, of a coarse aggregate sample that consists of fractured particles meeting specified requirements.
Test Method : ASTM D5821-01
This test determines the percentage of lightweight particles in aggregate by means of sink-float separation in a heavy liquid of suitable specific gravity.
Test Method : ASTM C123-03
Electrochemical Resistivity by Wenner Probe Method
This test method determines the amount of chemical substances, including organic matter, in samples of soil and ground water including the determination of some electrochemical and corrosivity properties of soil and water samples.
Test Method : BS EN 1377 Part 3 : 1990 CL 10.3
Fine Aggregate Angularity Value
This test method determines the loose uncompacted void content of a sample of fine aggregate. When measured on any aggregate of a known grading, void content provides an indication of that aggregate's angularity, sphericity, and surface texture compared with other fine aggregates tested in the same grading.
Test Method : ASTM C 1252 - 03
Los Angeles Abrasion Value of Small/ Large Size Aggregates
This test is a measure of degradation of mineral aggregates of standard gradings resulting from a combination of actions including abrasion or attrition, impact and grinding in a rotating steel drum containing a specified number of steel spheres, the number depending upon the grading of the test samples. After the prescribed number of revolutions, the contents are removed from the drum and the aggregate portion is sieved to measure the degradation as percent loss.
This test determines the ten per cent fines value (TFV) of aggregates which give a relative measure of the resistance of an aggregate to crushing under gradually applied compressive load.
Test Method : BS 812 Part 111 : 1990
Sodium/ Magnesium Sulphate Soundness Loss
An aggregate samples is extracted with twice its own mass of distilled or demineralized water to remove water-soluble sulphate ions. The water-soluble sulphate content is determined by either an ion-exchange method or a gravimetric method.
Test Method : ASTM C88 - 99
Sand Equivalent Value
The purpose of this test is to indicate the relative proportions of clay-like or plastic fines and dust in granular soils and fine aggregates that pass the 4.75mm sieve. The sand equivalent is expressed in percentage where sand equivalent is the ratio of the height of sand to the height of clay times 100.
Test Method : ASTM D2419 - 09
Methylene Blue Value
This test covers the measurement of the absorption of methylene blue dye by a clay, which is calculated as a methylene blue index for a clay.