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DETERMINATION OF LOS ANGELES ABRASION VALUE
(i) to determine the Los Angeles abrasion value.
(ii) to find the suitability of aggregates for utilization in road construction. EQUIPMENT:
The apparatus as per CAN BE: 2386 (Part IV) – 1963 contains: (i) La Machine: It consists of a hollowed out steel tube, closed by both the ends with an indoor diameter of 700 mm and span 500 millimeter and capable of rotating about the horizontal axis. A easily-removed steel shaft projecting radially 88 logistik into tube and extending complete length (i. e. 500 mm) is definitely mounted securely on the in house of cyndrical tube. The rack is placed at a distance 1250 logistik minimum from your opening in direction of rotation. (ii) Abrasive fee: Cast flat iron or stainlesss steel balls, roughly 48mm in diameter every weighing among 390 to 445g; six to twelve projectiles are required. (iii) Sieve: 1 . 70, 2 . 36, 5. 75, 6th. 3, 12, 12. five, 20, 25, 40, 40, 63, 85 mm IS DEFINITELY Sieves. (iv) Balance of capacity 5kg or 10kg
(v) Blow drying oven
(vi) Miscellaneous just like tray
The aggregate employed in surface course of the highway pavements will be subjected to using due to movement of traffic. When automobiles move on the trail, the garden soil particles present between the pneumatic tyres and road surface trigger abrasion of road aggregates. The stainlesss steel reamed rims of animal driven automobiles also cause considerable usure of the highway. Therefore , the trail aggregates must be hard enough to resist abrasion. Resistance to erosion of aggregate is determined in laboratory simply by Los Angeles check machine. The principle of Los Angeles scratching test is to produce coarse action by use of standard steel tennis balls which the moment mixed with aggregates and spun in a drum for certain number of cycles also causes impact on aggregates. The percentage wear of the aggregates due to chaffing with metallic balls is decided and is called Los Angeles Erosion Value. METHOD:
The test test consists of clean aggregates dried up in oven at 105° – 110°C. The sample should...