What is Laa value?
What is Laa value?
The aggregate retained on the sieve is weighed and the difference between this weight and the original weight is expressed as a percentage and reported as the L.A. abrasion loss value.
What is a good LA abrasion value?
Recommended Los Angeles Test Values for Pavements
| Sl. No. | Type of Pavement | Max. permissible abrasion value in % |
|---|---|---|
| 1 | Water bound macadam sub base course | 60 |
| 2 | WBM base course with bituminous surfacing | 50 |
| 3 | Bituminous bound macadam | 50 |
| 4 | WBM surfacing course | 40 |
Is the example of LA 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.
Why is LA test superior?
The Los Angeles (L.A.) abrasion test is a common test method used to indicate aggregate toughness and abrasion characteristics. Aggregate abrasion characteristics are important because the constituent aggregate in HMA must resist crushing, degradation and disintegration in order to produce a high quality HMA.
What is CBR of soil?
DEFINITION OF C.B.R. It is the ratio of force per unit area required to penetrate a soil mass with standard circular piston at the rate of 1.25 mm/min. to that required for the corresponding penetration of a standard material. C.B.R. = Test load/Standard load 100.
Why is the abrasion test important?
Important of Abrasion Test 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.
Why is aggregate crushing test done?
The strength of coarse aggregates is determined by the aggregates crushing test. The aggregate crushing value test provides resistance of an aggregate to crushing under a gradually applied compressive load. To construct a high quality of pavement, aggregate possessing low aggregate crushing value should be preferred.
What is the principle of Los Angeles abrasion test?
Abrasion test is carried out to test the hardness property of aggregates. The principle of Los Angeles abrasion test is to find the percentage wear due to relative rubbing action between the aggregate and steel balls used as abrasive charge.
What is a good CBR value?
What are the typical CBR values? The harder the material, the higher the CBR value. A CBR value of 2% is usually found for clay, high-quality sub-base will have CBR values between 80% and 100%, and some sands may have values around 10%.
