New standard DM-III fully enclosed aggregate Los Angeles abrasion tester

This method is applicable for determining the Los Angeles abrasion value of coarse aggregates to evaluate their crushing resistance.

Structure: This machine is mainly composed of components such as cylinder, iron support, sealing cover, bracket, spindle, gearbox, motor, counter, etc.

2、 Main technical parameters:

1Cylinder inner diameter x inner diameter:711±5mm×508±5mm

wall thickness12mm±0.5mm

The feeding port is150mm±3mm

Partition: (size)89mm±2mmthickness25mm±1mm

2Motor power:1.1KWRotation rate of steel cylinder:（30～33）r/min

3The speed counter automatically records (displays the number of rotations of the cylinder)

4Steel ball: Φ45.6mm-Φ47.6mmThe quality is390~445g

3、 Preparation for the experiment

3.1Divide the sample into a set of sub samples. Soak the sample in water and use a metal wire brush to clean the surface of the particles. Rinse multiple times until the water is visually clear. Drain,105℃±5Dry at ℃ until the surface is dry, and the drying time should not exceed4hThen cool to room temperature. Temperature sensitive recycled materials can be used40℃±5Dry at ℃.

3.2 from the tableT0317-1Select a test sieve based on the composition of similar particle sizes, and sieve the dried sub sample into different particle sizes.

4Test steps

4.1Clean the inside of the cylinder thoroughly. According to the tableT0317-1Requirement: Select the specified quantity and total mass of steel balls and place them in the cylinder.

4.2.According to the tableT0317-1Requirement: Weigh particles of different particle sizes to form a sample. When a certain particle size has a high content, it needs to be reduced to the required quality particles. Weigh the total mass of the samplem1After installation into the cylinder, cover the testing machine lid and tighten the seal.

4.3.Set the counter to zero and follow the table0317-1Request to set the number of rotations. Start the testing machine to30～33r/minRotate the speed to the required number of times.

4.4Open the cover of the testing machine, move the steel ball and all samples into the metal tray, and pick up the steel ball from the sample.

4.5pressT0302Medium dry sieving method, use the sample1.7mmThe square sieve is fully sieved, and then the sample on the sieve is washed clean with water, drained, and placed105℃±5Dry in a ℃ oven to a constant weight, and weigh after cooling at room temperaturem2.5