What are the requirements of abrasive charge?
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. Sieve: 1.70, 2.36, 4.75, 6.3, 10, 12.5, 20, 25, 40, 50, 63, 80 mm IS Sieves. Balance of capacity 5 kg or 10 kg. Drying oven.
What does abrasion value mean?
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 a good LA abrasion value?
Therefore, an L.A. abrasion loss value of 40 indicates that 40% of the original sample passed through the No. The standard Los Angeles abrasion test is: AASHTO T 96 or ASTM C 131: Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine.
What is the size of fine aggregates?
4.75mm
The size of fine aggregates is defined as 4.75mm or smaller. That is, aggregates which can be passed through a number 4 sieve, with a mesh size of 4.75mm. Fine aggregates include things such as sand, silt and clay. Crushed stone and crushed gravel might also fall under this category.
What is crushing strength of aggregate?
Aggregate crushing value is defined as the percentage by weight of the crushed (or finer) material obtained when the test aggregates are subjected to a specified load under standardized conditions, and the strength of the aggregate used in road construction is expressed by numerical index.
What is 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.
What are the three types of abrasion?
Abrasions are classified into three types that include linear or scratch abrasions, grazed or brush abrasions, and patterned abrasions.
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.
What is M sand?
Manufactured sand (M-Sand) is artificial sand produced from crushing hard stones into small sand sized angular shaped particles, washed and finely graded to be used as construction aggregate. It is a superior alternative to River Sand for construction purpose.
What is bulking of sand?
Bulking in sand Occurs When dry sand interacts with the atmospheric moisture. Presence of moisture content forms a thin layer around sand particles. This results in the increase of the volume of sand. Excessive presence of moisture content in the sand makes concrete to less durable and lose its strength.
Which is the best definition of the word abrasive?
Definition of abrasive. (Entry 1 of 2) 1 : causing damage, wear, or removal of surface material by grinding or rubbing : tending to abrade abrasive compounds for whitening teeth an abrasive surface. 2 : causing irritation abrasive manners an abrasive personality. abrasive. noun. Definition of abrasive (Entry 2 of 2)
How does the abrasive affect the surface of the material?
These grains, commonly called grit, have rough edges, often terminating in points which will decrease the surface area in contact and increase the localised contact pressure. The abrasive and the material to be worked are brought into contact while in relative motion to each other.
How to calculate the abrasion value [ Figure 1 ]?
The Los Angeles (L.A.) abrasion test (Figure 1) is a common test method used to indicate aggregate toughness and abrasion characteristics. Therefore, an L.A. abrasion loss value of 40 indicates that 40% of the original sample passed through the No. 12 (1.70 mm) sieve. How Do You Calculate the Abrasion Value?
What does abrasive gel mean in medical terms?
Following cap placement, a small amount of abrasive gel was inserted into each of the electrode sites and the mastoid sites. His explanation of how he fulfilled his obligations and was therefore free to take up arms again was circumstantial and abrasive .
