1、 Introduction to Concrete Penetrometer

Concrete is a widely used artificial stone in modern construction. For certain buildings, such as hydraulic structures, underwater, underwater, underground, and other construction projects, special performance is required for the building-The so-called anti-seepage performance refers to the ability of materials used in structures to resist the infiltration of water and other liquid (light oil, heavy oil) media under pressure.

this deviceMainly used for testing the impermeability performance of concrete and determining the impermeability grade. At the same time, it can also be used for measuring the breathability and quality inspection of building materials, and has been widely used by relevant departments such as production, construction, design, and research.

IIParameters

1Maximum work pressure:4MPa

2Working mode: automatic voltage stabilization and manual voltage stabilization(Digital display type: automatic constant voltage and automatic boost)

3Number of test pieces that can be tested at once:6individual

4Geometric dimensions of the trial mold (also known as the main mold)

Diameter of upper mouth of mold cavity: φ174.8mm

Diameter of the lower mouth of the mold cavity: φ185mm

Height:153mm

5Piston pump parameters: Flow rate:0.16L/min

6Motor power:120WPower supply:380V-50HZ

7External dimensions:950×800×950mmmm

8Quality: ≈220kg

IIIWorking principle and mechanism principle

1、HS-4Type impermeability tester andHP-4.0The digital anti-seepage instrument is an instrument that uses the principle of equal pressure at all points inside a sealed container (ignoring water level differences), applies pressure to the entire system through a water pump, and uses an electric contact pressure gauge or pressure controller to increase the pressure to achieve the permeation of pressure water from bottom to top. The instrument is used to measure the anti-seepage performance of the specimen and calculate its anti-seepage grade.

2Structure

Mainly composed of a box and a workbench, made of stainless steel panels, and installed with6A mold base and36individualM12Bolts are used for installing trial molds.

3Supply pressure system

It consists of an electric motor, a power box, a water pump, a water bag, a safety valve, pipelines, etc. The electric motor is used to provide power to the system, the power box is used to convert the power provided by the electric motor into reciprocating motion power and provide a water supply pump, the water pump is used to provide water pressure to the entire system, the water bag is used to stabilize the water pressure supply to the system and serve as a water pressure source, and the power box is used to convert the power provided by the electric motor into reciprocating motion power and provide it to the water pressure, as well as to divert the water pressure source; The installation of the safety valve in the center of the water bag is to ensure that the system pressure is not greater than4MPA

4Operating Console

It mainly consists of electrical control and control valves. Controlled by red and green button switches1Composed of only electric contact pressure gauges, the green button is the start switch and the red button is the stop switch. The electric contact pressure gauge is used to control the pressure of the supply pressure system to remain within the range you need. When the pressure pointer reaches the upper limit, the water pump stops working. Due to factors such as specimen infiltration, the water pressure drops and the pointer rotates counterclockwise, leaving the upper limit position until it reaches the lower limit position. The water pump restarts and the water pressure rises to the upper limit position（2）Control valve. Its opening and closing are the same as those of general valves, that is, clockwise rotation is the relationship, counterclockwise rotation is the opening, and each valve controls a corresponding test mold, （3）Electrical control part: composed of combination switches and1Composed of a controller connected only to pressure sensors. Combination switch controls the power supply of the anti-seepage meter, “0”Position is closed“1”Position is open; Controller language controls the pressure of the pressure supply system to remain within the range you need. For detailed operating instructions on the controller, please refer to the appendix "Operating Instructions for Digital Impermeability Tester Pressure Controller"

4Installation and use

1prepare

aPlace the anti-seepage instrument on a flat and solid indoor foundation,

bClose the water discharge and pressure relief valve located at the bottom right of the box

c, Open6A control valve

dFor the first use, fill the tank with water, open the control valve, start the power supply, until6Until the water inside the mold seat overflows, in order to exhaust the air inside the system.

eClose the control valve

2Preparation and installation of test specimens

aForming and curing of test specimens, using forming molds (also known as secondary molds) according to the material ratio required by the design, and then covering according to the specifications of the department or international standards.

bDry the surface of the cured specimen and apply melted sealing material (fire paint or sealing wax) on its side. Pay attention to both ends of the specimen and strictly prohibit the application of sealing material.

cHeat the test mold to40℃, then place the specimen coated with sealing material into the mold cavity, and then press the specimen into the mold on a press (screw press or borrowed laboratory pressure testing machine) and cool it to room temperature, preferably using the one produced by our factoryDL-200KNThe hydraulic demoulding machine can be used for both installation and demoulding, as well as for splitting test specimens and observing the depth of water seepage.

dInstall the test mold with the pressed specimen on the worktable of the impermeability tester and evenly tighten the screw cap

3Connect the power, turn on two red signal lights, and adjust the upper limit pointer of the electric contact pressure gauge to0.1MPAThe lower limit pointer can be close to it but cannot be in contact at the same time (approximately less than the upper limit pointer)0.05mpa),Then press the green button to start the power supply, and the water pump will start working. The pointer of the electric contact pressure gauge will rotate clockwise as the water pressure rises. Pay attention to whether the pressure rise is normal and whether there is any leakage in the system. If there is any abnormality, it should be eliminated before entering the test. Follow the operating instructions in the appendix.

4Open the control valve and apply water pressure to the corresponding specimen. Pay attention to whether there is any leakage at the bottom of the test mold. If there is leakage, tighten the corresponding clamping nut.

5After entering the normal test, every8Hour increases work pressure0.1MPAObserve the end face of the specimen at any time for any water seepage. If there is any water seepage, close the corresponding control valve.

6When6There are3When pressure water seeps out from the end face of a test piece, the test can be stopped and the water pressure of ten millimeters should be recorded as the calculation basis.

7After the experiment is completed, cut off the power supply, open the water discharge and pressure relief valve to reduce the system pressure to zero, and remove the test mold,

8Press out the test piece from the test mold, clean the test mold and mold seat, and apply anti rust oil for reuse

5result calculation

1The anti-seepage grade of concrete is expressed as the maximum water pressure when four out of six specimens in each group do not show water permeability. The calculation formula is:S=10H-1Among them:S-Impermeability gradeH-The pressure at which the third of the six specimens seeps water（MPA）

2If pressure is added to1.2MPApass through8Even after hours, the water seepage still does not exceed2The concrete impermeability grade should be greater than or equal to12That isS=12

VImaintenance

1Requirements for the working environment: The ambient temperature is5℃-45℃； Relative temperature<80%Not working in an environment containing corrosive gases for a long time

2The water source should be clean and free of impurities.