CCIL / LABORATORY INSPECTION CHECKLIST
Standard Test Method for Resistance to Degradation of Small-Size coarse Aggregate by
Abrasion and Impact in the Los Angeles Machine¹
ASTM C131 - 06
APPARATUS: / Clause 6.0
1. Los Angeles Machine / Clause 6.1
a.
b.
c.
d.
e.
Wall thickness not less than 12.4 mm? ………………………………………..
Hollow steel cylinder closed at both ends? ……………………………………
Inside diameter 711 ± 5mm? ……………………………………………………
Inside length of 508 ± 5mm? ……………………………………………………
Rotation 30 to 33 r/min for 500 revolutions? ……………………....................
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Note 1: Additional details provided in ASTM C131 – 06 / Clause 6.1
2. Charge / Clause 6.4
a.
Charge shall meet the following requirements? ……………………………... ____
diameter approximately 46.8mm
mass of between 390 and 445 g
-
b. Mass of charge determined by gradation - Reference ASTM C136 – 06
Table I? …………………………………………………………………………… ____
Grading
A
B
C
D
3.
No. of Spheres
12
11
8
6
Mass of Charge, g
5000 ± 25
4584 ± 25
3330 ± 20
2500 ± 15
Sieves, conforming to ASTM E11? …………………………………………………….. ____
4. Balance accurate within 0.1 % of test load over the range required for this Test? … ____
SAMPLING / Clause 7.1
a. Field sample provided in accordance with ASTM D75? ........................ ____
b. Field sample reduced in accordance with ASTM C702? ….…………… ____
TEST SAMPLE PREPARATION / Clause 8.1
a. Washed and oven dried reduced sample at 110 ± 5°C (230 ± 9°F) to
constant mass? ...................................................................................... ____
b. Sieved into individual size fractions and recombined as per Table I? … ____
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Standard Test Method for Resistance to Degradation of Small-Size coarse Aggregate by
Abrasion and Impact in the Los Angeles Machine¹
ASTM C131 – 06
PROCEDURE / Clause 9.0
a. Test sample and charge placed in LA machine – rotated machine at
30 to 33 r/min for 500 revolutions? ……………….................................. ____
b. On completion, material discharged from LA machine and separated
on a sieve coarser than 1.70 mm (No. 12)? ……………………………... ____
c. 1.70 mm sieve used to separate the remaining material as per Test Method
C136? ……………………………………………………............................ ____
d. Material coarser than 1.70 mm sieve washed and oven dried at 110 ± 5°C
(230 ± 9°F) to a constant mass? ………………………………………….. ____
e. Determined mass to the nearest 1 g? ………………………................... ____
Note 2:
-
Wash requirement for test is optional if aggregate is free of coating and dust.
Washing procedure shall be performed in case of referee testing.
CALCULATIONS / Clause 10.1
a. Loss calculated as a % of the original mass of the test sample? ……… ____
REPORTING / Clause 11.0
a. Identification of the aggregate: Source, type and nominal maximum
size? ………………………………………………………………………….. ____
b. Grading used from ASTM C131 / Table I? ………………………………. ____
c. Loss expressed to the nearest 1% by mass? …………………………… ____
COMMENTS:
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