Los Angeles Abrasion Test - 974 Words

1.0 Introduction The properties of aggregates used in asphalt concretes are very important to the performance of the pavements in which the asphalt concretes are used. Often pavement distress, such as stripping and rutting, can be traced directly to the aggregates used. Clearly, proper aggregate selection is necessary for attaining desired performance. The aggregate used in surface course of the highway pavements are subjected to wearing due to movement of traffic. When vehicles move on the road, the soil particles present between the pneumatic tyres and road surface cause abrasion of road aggregates. The steel reamed wheels of animal driven vehicles also cause considerable abrasion of the road surface. Therefore, the road aggregates†¦show more content†¦The sample is washed and dried and later the weight is obtained. 2. The sample is placed in L.A. Abrasion Machine. 3. Eleven steel balls are added in the machine. 4. The drum is rotated for about 500 revolutions at 30-33 rpm. 5. After being rotated, the sample is removed from the drum and is sieved on no. 12 sieve. Later the sample that is retained on the sieve is washed and dried at the temperature of 1050C to 1100C. The weight of the sample is taken after the sample is cooling down. 4.2 Flow Chart 4.3 Picture of the Procedure 5.0 Result/Calculation Table 5.1: Result of LAA test Aggregate Size (mm) | Weight Of Sample Before (g) | Weight Of Sample After Abrasion (g) | Loss (g) | 19 - 12.5 | 5000 2500 2500 | 4190 | 810 | 12.5 - 9.5 | | | | Calculation: Weight loss = (Weight of sample before abrasion) – (Weight of sample after abrasion) = 5000 – 4190 = 810 g = 0.81 kg Percent loss = (Weight loss / Total weight of sample) x 100 = 8105000 x 100 = 16.2% 30% (JKR standard requirement) The result obtained in this experiment shows that the percent loss due to degradation of aggregates by abrasion is 16.2%. As the percent loss of the sample is below the range of standard requirement of maximum 30% byShow MoreRelatedTesting On Aggregate Crushing Value Test2171 Words   |  9 PagesChapter-4 Testing On Aggregate 4.1 Aggregate crushing value test 4.1.1 Aim The aim of that Test is to determine the aggregate crushing value of coarse aggregate which is passed from 12.5mm IS sieve and retained on a10mm. 4.1.2 Apparatus †¢ A steel cylinder of 15mm diameter with base plate and plunger †¢ A straight metal taping rod 16mm diameter and 45 to 60cm long rounded at one end. †¢ A balance of capacity 3 kg readable and accurate to one gram. †¢ IS sieves of sizes 12.5mm, 10mm and 2.36mm †¢ A compressionRead MoreLaw Enforcement Agencies And Its Effects On The United States999 Words   |  4 Pagesshepherds and Dobermans can exert bite forces up to 1500 pounds per square inch, while Rottweilers and Belgian Malanois’ can exert bite forces up to 2000 pounds per square inch (Hutson et al., 1996). 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