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- This method is used on coarse aggregates with a maximun size less than 37.5 mm (1 1/2 in) for resistance to degradation using the Los Angeles Machines.

- The values stated in SI units or inch-pund units must be considered separately as standard.

- This standard indicates that it is the user´s responsability to establish appropiate health and safety practices befores its use.

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ASTM A6/A6M

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For definitions of terms used in this test method, refer to Terminology C125

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Measures degradation of aggergates or wear, impact, and crushing in a rotating drum containing a number of steel balls, depending on the method. These spheres create a crushing impact effect. The revolutions are indicated, then it is withdrawn from the drum the sample is sieved to measure degradation as percentage loss.

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This test indicates the relative quality of aggregates having similar mineral compositions. Comparisons between sources clearly different in origin, composition or structure are not allowed.

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that meets all the caracteristics
of design
hollow steel cylinder
thickness 12mm
diamenter of 7115mm
5085mm length
the surface to be free of disturbances
in order not to interrupt the  path of the samples and the
spheres, the cylinder has 2axes for horizontal rotation the machine has to rotate fron 30 to33rpm
sieves according to the specification
scale accurate to1%
mats with diameter 46mm its mass of 390to445white.

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Obtain samples in accordance with practice D75
reduce sample in acordance with C702
introduction of the test sample. A suitable, dust-tight cover shall be provided for the opening with means for bolting the cover in place. The cover shall be so designed as to maintain the cylindrical contour of the interior surface unless the shelf is so located that the steel spheres and sample shall not impact on or near the door opening and the opening cover during the test. A removable steel shelf extending the full length of the cylinder and projecting inward 89 6 2 mm [3.5 6 0.1 in.] shall be mounted on the interior cylindrical surface of the cylinder, in such a way that a plane centered between the large faces coincides with an axial plane. The shelf shall be of such thickness and so mounted, by bolts or other suitable means, as to be firm and rigid. The position of the shelf (Note 4) shall be such that the sample and the steel spheres shall not impact on or near the opening and its cover, and that the distance from the shelf to the opening, measured along the outside circumference of the cylinder in the direction of rotation, shall be not less than 1270 mm [50 in.]. Inspect the shelf periodically to determine that it is not bent either lengthwise or from its normal radial

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Wash the reduced sample (see 9.1.1) and oven dry at 110 6 5°C [230 6 9°F] to a constant mass, separate into individual size fractions, and recombine to the grading of Table 1 most nearly corresponding to the range of sizes in the aggregate as furnished for the work. Record the mass of the sample prior to test to the nearest 1 g

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9.1 Place the test sample and the charge in the Los Angeles testing machine and rotate the machine at a speed of 30 to 33 r/min for 500 revolutions (Note 7). After the prescribed number of revolutions, discharge the material from the machine and make a preliminary separation of the sample on a sieve coarser than the 1.70-mm (No. 12) sieve. Sieve the finer portion on a 1.70-mm (No. 12) sieve in a manner conforming to Test Method C136. Wash the material coarser than the 1.70-mm (No. 12) sieve and oven-dry at 110 6 5°C [230 6 9°F] to a constant mass, and determine the mass to the nearest .
If the aggregate is essentially free of adherent coatings and dust, the requirement for washing after the test is optional. However, in the case of referee testing, the washing procedure shall be performe

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Calculate the loss as a percentage of
the original mass of the test sample. Report this value as the
los percentage.

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1.Abrasion;
2.Aggregate (coarse; small size);
3.Cover Plate
4.Degradation;
5. Fractions
6.Impact
7. Los Angeles machine
8. Revolutions
9. Rotation
10. Spheres Steel

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1.1 Identification of the aggregate as to source, type, and
nominal máximum size;

1.2 Grading designation from Table 1 used for the test;

1.3 Loss by abrasión and impact of the sample expressed
to the nearest 1% by mass.

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12.1 For nominal maximum size of 19.0 mm (3⁄4 in.)
aggregate with percentage losses in the range of 10 to 45%, the
The coefficient of variation for various laboratories has been found to be 4.5%.
Therefore, the results of two tests performed correctly by
the same operator in the same coarse aggregate are not
are expected to differ from each other by more than 5.7% (95%
probability) of its average.

12.2 Bias—Since there is no accepted reference material
suitable for determining the bias for this procedure, no statement on bias is being made