Step 2: Add sand into the sand bucket to the top of the bucket about 15mm, and weigh the mass of sand in the bucket (M 1), accurate to1g.
Step 3: Place the sand filling pipe with nominal weight on the dug test hole, and then turn on the switch below to let the standard sand naturally flow into the hole. Try not to vibrate during the whole process, and always keep the sand in a natural state, which is the closest to the standard ratio and the most accurate result.
Step 4: When the sand in the sand-filled bucket stops falling, that is, when the experimental pit is full of standard sand, turn off the switch at the bottom again, and then weigh the remaining sand and bucket, so that the weight of the sand in the experimental pit can be calculated, and then the volume of the pit can be calculated according to the specific gravity of the sand.
Step 5: This is the filled experimental pit, which is extra because there is a cone at the lower part of the sand filling cylinder. Put the tray on a flat piece of lime soil, put the sand-filled filling cylinder marked with the title weight on it, open the valve, and weigh the remaining weight when it does not fall.
This is the volume of the vertebral body and the gap between the trays. At this step, all the data needed for the whole experiment have been obtained, and the rest is the work of the laboratory, which needs to dry the lime soil and measure the water content.
Step 6: Standard sand is very expensive and should be reused. Now take the standard sand out of the experimental pit. Be careful, because there is loose lime soil in the pit, which can easily be mixed with sand, and the test will be inaccurate.
Step 7: In order to prevent large lime-soil particles from mixing into the sand, a sieve should be used for screening.
Extended data
1.2. 1 standard sand should be cleaned, with a particle size of (0.25-0.50)mm and a density of (1.47-1.61) g/_ 3.
1.2.2 Assemble the sand bottle and sand filling funnel, tighten the threaded joint and weigh it.
1.2.3 erect the densimeter, with the mouth of the sand filling funnel facing upward, close the valve, fill the sand filling funnel with standard sand, open the valve, so that the standard sand in the sand filling funnel leaks into the sand bottle, and continue to inject sand into the funnel and leak into the sand bottle. When the sand stops flowing, quickly close the valve, dump the excess sand in the funnel, and weigh the total mass of the sand bottle, sand filling funnel and standard sand to 5 g, and avoid vibration in the test.
1.2.4 Pour out the standard sand in the sand container, pour water into the sand container through the funnel until the water level is higher than the valve, close the valve, pour out the excess water in the funnel, weigh the total mass of the sand container, funnel and water as 5 g, measure the water temperature to 0.5℃, and repeat the measurement for 3 times. The difference between the three measurements shall not be greater than 3 ml, and the average of the three measurements shall be taken.
1.2.5 volume of sand container (VR)= (total mass of sand container, funnel and water (MR2)- mass of sand container and funnel (MR 1))÷ density (PWR) at different water temperatures.
1.2.6 density of standard sand (PS)= (total mass of sand container, funnel and standard sand (MRS)- mass of sand container and funnel (Mr 1)÷ volume of sand container (VR).