TD116 Series Soil densitometer (also called A-B soil hydrometer)

standard

Low ASTM 152 h

Low JTG E40-116

I. Product parameters:

Product Name Soil hydrometer (soil densitometer)

Measurement range 0-60 (0.995-1.030)

Natural moisture content soil samples were used for solid material

Product features air - dried (dried) soil samples are carried out

Type A Soil hydrometer (0-60)

B type soil densitometer (0.995-1.030)

Two, instructions:

1. Natural moisture content soil samples or air-dried (oven-dried) soil samples should be used for particle analysis test by densitometer method.

2. For air-dried (oven-dried) soil samples, take 100-300g representative soil samples, put them into a mortar and grind them with a pestle with a rubber head, pass the ground soil through a 2mm sieve, grind the soil on the sieve and then filter it until only particles larger than 2mm are left on the sieve.

3. The soil samples with particle size less than 2mm were mixed evenly, and the soil samples with grain quality were taken as the samples. When the soil samples with natural moisture content were used as the experiments, the required wet soil mass was calculated according to the following equation.

. Will pour sample preparation triangle in the beaker, about 200 cm after water immersion into 18 hours, grain size analysis experiment was carried out directly with natural moisture content of soil samples do not soak or shorten soaking time, a little after the oscillation, boiling on the sand bath boiling the start time, clay and unfavorable dispersive soil boil 1 hour or so, the other not less than 0.5 hours.

5. After the soil densitometer sample is cooled, pour it into the measuring cylinder used for sample separation. Wash the soil in the beaker and pour it all into the measuring cylinder. Add 10cm³ dispersant (4% sodium hexametaphosphate, 6% hydrogen peroxide or 1% sodium silicate), and then add water for 1000 cm³.

6. The agitator was used to stir up and down the whole suspension depth in the measuring cylinder for about 1min, reciprocating 30 times each, so that the soil particles in the suspension were evenly distributed.

7. Take out the agitator, start the stopwatch at the same time, and measure the densitometer reading at 1, 2, 5, 15, 30, 60, 120 and 1440min. The densitometer of type B is denoted as, and the density of type A is denoted as. Put the densitometer into the measuring cylinder about 15 seconds before each measurement, and take it out immediately after reading. When reading, pay attention to the floating bubble shall not be close to the wall of the measuring cylinder, and the reading is the reading of climbing to the highest point of bending liquid surface. Type A hydrometer estimated degree to 0.1, type B hydrometer estimated degree to 0.0001, after reading the suspension temperature measurement, accurate to 0.5℃

8. If it is found that at the first reading, the soil in the measuring cylinder has exceeded 15% of the total soil mass, the soil in the measuring cylinder will be washed and screened with a 0.075mm analysis screen, and then the particle size analysis test of coarse particles larger than 0.075mm will be carried out according to the sieve analysis method.