Manual Soil Relative Density Apparatus
The XD-1 manual relative density meter is used to determine the maximum to minimum void ratio of aggregated soil with a particle size of less than 5 mm for the calculation of relative density.
Technical Parameters
| Metal Container |
Capacity |
250cm3, 1000cm3 |
| Internal diameter |
dia. 5mm, dia. 10mm |
| Height |
12.75cm |
| Hammer |
Weight |
12.5kg±5g |
| Free fall |
15cm |
| Diameter |
dia. 4.9cm, dia.9.9cm |
| Package |
special carrying case. |
Manual and Relative Density Meter Instructions
1. Purpose and scope of use
This instrument is used to measure the maximum and minimum pore ratio of aggregated soil with particle size less than 5mm for calculating relative density.
2. Main specifications
There are two types of metal container cylinders:
Volume 250cm3 inner diameter φ5cm height 12.7cm
Volume 1000cm3 inner diameter φl0cm height 12.7cm
Hammer weight 1.25kg ± 5g
Drop height 15cm
Hammer seat diameter 4.9cm 9.9cm
3. Main structure
The instrument is composed of a container barrel, a hammer, a vibrator, a funnel, a tapered plug, and a leveling device.
l. Wet bucket, tapered plug, and whisk are used to measure the maximum void ratio.
2. Container cylinder, hammer, vibrating instrument, used to measure the minimum void ratio.
4. How to use and matters needing attention
(For the detailed steps of the method of use, please refer to the operating procedures for soil engineering of the Ministry of Water Resources of the People's Republic of China).
Determination of maximum void ratio:
1. Take a representative sample of about 1.5kg. After air-drying, rub it with your hands and scatter it on a rubber ball, and mix it evenly.
2. Insert the tapered plug from the bottom of the funnel and lift it up, so that the cone blocks the lower opening of the funnel, and put it into a measuring cylinder with a volume of 1000cm, so that the lower end is in contact with the bottom of the cylinder.
3. Weigh 700g of the sample and pour it into the funnel evenly. At the same time, lift the funnel and the tapered stopper rod, and move the tapered stopper, so that the sand sample falls into the measuring cylinder slowly and evenly. During the process, pay attention to the lower opening of the funnel, often Keep it about 1-2cm above the sand surface.
4. After all the samples fall into the measuring cylinder, use a whisk to smooth the sand surface carefully, pay attention not to make the measuring cylinder vibrate, so as to achieve a very loose accumulation of the sample, and then measure the volume of the sample from the scale of the measuring cylinder.
5. Block the mouth of the measuring cylinder with a palm or leather plug, turn the measuring cylinder upside down, and then quickly turn it back to the original position. Repeat this several times to record the maximum volume and calculate the maximum void ratio.
Note: When the falling sample does not contain particles larger than 2mm, 400g of the sample can be used for testing with a 500cm3 measuring cylinder.
Determination of minimum void ratio:
1. Take 600-800g of a representative sample and pour it into a 1000cm3 metal container, and vibrate on both sides of the container, 150-200 times per minute. At the same time, use a hammer on the surface of the sample every minute Hammer 30-60 times until the volume of the sand sample remains unchanged (usually about 3-5 minutes)
2. Then add soil for the second time, and still carry out vibration and hammering according to the above method.
3. When adding soil for the third time, a ring should be added to the mouth of the container first. After adding soil and compacting, remove the ring and use a soil repair knife to cut off excess samples on the top surface of the container, and calculate the minimum void ratio after weighing.
Note: If the sample is smaller than 2mm particles, it is advisable to take about 600g of the sample and use a 250cm3 container for the test.
Precautions:
1. When beating the sand sample, the container cylinder should be placed on a flat surface, and check whether the screw connections of the hammer and other components are loose.
2. During the test, use sufficient force to keep the sample in a state of vibration when hammering. When hammering, coarse sand can be used with less number of blows and finer sand should be used with more blows. The hammer must fall freely and vertically, and the hammered part must be uniform.
5. Service life:
The service life of this instrument under normal conditions is ten years.
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