The irrigation method is a professional testing instrument. It is suitable for the rapid detection of the compactness of railway subgrade. According to the volume of water poured into the test tube, the specific gravity of the test tube material is calculated to calculate the compaction value.
Irrigation method compaction tester technical parameters
★ test tube diameter 200mm, test tube height 350mm
★A large water volume 10000ml
★ Accuracy ±25ml
★ Weight: 30kg
Main steps of the irrigation method for the irrigation method
★ Fix the seat plate after leveling the surface. The polyethylene plastic film is laid tightly along the inner wall of the ring and the surface. Record the initial water level of the water storage tank, and fill the water into the seat plate until it is full. Record the water level of the storage bucket and calculate the partial volume of the seat plate.
★ Dig down to the required depth, fill the sample falling into the pit into the soil container, and measure the water content.
★ Repair the wall of the pit and lay the plastic film close to the bottom of the pit and the wall of the pit.
★ Record the initial water level in the water storage tank and fill the water. When the water surface is flush with the upper edge of the ring sleeve, the water injection pipe is closed, and the water level in the water storage tank is recorded for 3 to 5 minutes.
Determination of calculation by irrigation method of watering method
The fine water and stone should be separated to determine the water content, and the overall water content is determined by the following formula:
Where: ωf——water content of the fine fraction, %;
Ωc——the water content of the stone part, %;
Ρf——the ratio of the dry mass of the fine granules to the dry mass of all the materials.
The division of fine aggregates and stones is bounded by a particle size of 60 mm.
Calculate the volume of the seat plate portion as follows:
Where: V1 - the volume of the seat plate part, cm3
Aw——water storage tube sectional area cm2
H1——the initial water level in the water storage tank, cm;
H2——the height of the water level at the end of the water injection in the water storage tank, cm.
Calculate the test pit volume as follows
Where: V - test pit volume, cm3
H1——the initial water level in the water storage tank cm
H2——Water level height cm at the end of water injection in the water storage tank
Calculate the wet density as follows:
In the ceremony of measuring the compaction degree of irrigation method: mp——take the quality of the sample in the test pit, g