Which machine is used for abrasion test?
Which machine is used for abrasion test?
oscillating sand tester is used to measure the relative abrasion resistance of a material to surface abrasion and / or marring.
Which apparatus is used for abrasion test on aggregate?
Los Angeles Machine
The apparatus as per IS: 2386 (Part IV) – 1963 consists of: Los Angeles Machine. Abrasive charge: Cast iron or steel balls, approximately 48mm in diameter and each weighing between 390 to 445 g; six to twelve balls are required.
What is aggregate abrasion value?
The abrasion value of an aggregate is the value that determines aggregate toughness and abrasion resistance. It includes properties of aggregate such as crushing value, degradation, and disintegration.
What is an abrasion machine?
Applications. Los Angeles Abrasion Machines are used as quality control tools for aggregates, including crushed rock, gravel and slag. The testing method determines the degradation when subjected to abrasion, attrition, impact and grinding. The sample is placed in the drum along with a hardened steel abrasive charge.
How do you calculate abrasion value?
ii) The proportion of loss between weight ‘A’ and weight ‘B’ of the test sample should be expressed as a percentage of the original weight of the test sample. This value should be reported as, Aggregate abrasion value = (A-B)/B x 100%.
How do you calculate aggregate crushing value?
Aggregate crushing value = (W2 x 100) / (W1-W) W1-W =Weight of surface dry sample. The mean of two result to nearest whole number is the aggregate crushing value.
How do you identify abrasions?
A typical Taber abrasion test consists of a disk-shaped specimen that is placed in constant contact with an abrasive wheel, using predetermined forces to a specified number of cycles to determine wear. The most commonly used standards for these tests are: ASTM D4060, ASTM F1978-12 and MIL-A-8625.
Why do we do LA abrasion test?
The Los Angeles (L.A.) Abrasion Test is widely used as an indicator of the relative quality of aggregates. It measures the degradation of standard gradings of aggregates when subjected to abrasion and impact in a rotating steel drum with an abrasive charge of steel balls.
How is abrasion measured?
The most common test method for determination of abrasion resistance is the Taber Abraser method (Figure 3.18). It consists of measuring the weight loss occurring when the coated (wooden) substrate is subjected to rotating abrasive wheels with defined load.
What is the ideal grading of aggregates?
Well graded : Well-graded aggregate has a gradation of particle size that fairly evenly spans the size from the finest to the coarsest. A slice of a core of well-graded aggregate concrete shows a packed field of many different particle sizes. It is characterized by the S- shaped in gradation curve.
Why aggregate crushing value test is performed?
The strength of coarse aggregates is assessed by aggregates crushing test. The aggregate crushing value provides a relative measure of resistance to crushing under a gradually applied compressive load. To achieve a high quality of pavement, aggregate possessing low aggregate crushing value should be preferred.
How is strength of aggregate determined?
The grading of an aggregate is determined by a sieve analysis, which is the distribution of particles of granular materials among various sizes, usually expressed in terms of cumulative percentages larger or smaller than a series of sizes of sieve openings (or the percentages between certain ranges of sieve openings).
How to carry out the Aggregate abrasion value test?
To carry out the aggregate abrasion value test, the following are the procedures used: 1. The cover of the machine is remove and the sample x & y is pour above into the machine. 2. The abrasion charges is place on the sample and the cover is fix back firmly. 3. The machine is switch on and it is allow to undergo 500 revolutions at 28 – 30rpm.
What does the abrasion loss value of 40 indicate?
A. abrasion loss value of 40 indicates that 40% of the original mass of the sample passed through the sieve. The abrasion test determines the relative quality, strength, and durability of mineral aggregates subject to impact and Abrasion. The values derived from L.A. Abrasion tests provide information on the performance of aggregate in use.
What is a simple abrasion test?
Abrasion Test is the measure of aggregate toughness and abrasion resistance such as crushing, degradation and disintegration. This test is suggested by AASHTO T 96 or ASTM C 131: Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in Los Angeles Machine.
What is Los Angles abrasion testing machine?
The apparatus used in this test are Los Angles abrasion testing machine, IS Sieve of size – 1.7mm, Abrasive charge – 12 nos. cast iron or steel spheres approximately 48mm dia. and each weighing between 390 and 445g ensuring that the total weight of charge is 5000 +25g and Oven.
