Vegetation concrete porosity measuring device and method

Abstract

A vegetation concrete porosity measuring device comprises a sample chamber, a reference chamber, an inert gas filling tank, a recovery tank, a vacuumizing pump, a barometer, a communicating pipe, a valve and a gas pipeline. Wherein the sample chamber and the reference chamber are sealed and independent glass containers, are connected through a communicating pipe and are controlled to be opened and closed by a valve I; a barometer I is installed on the reference chamber, and a barometer II is installed on the sample chamber. One side of the reference chamber is respectively connected with a first vacuumizing pipeline and an inflating pipeline; and one side of the sample chamber is respectively connected with a second vacuumizing pipeline and a gas recovery pipeline. According to the determination method, an ideal gas equation is taken as a principle, and the porosity of the vegetation concrete is obtained by determining the pressure change of the two chambers. The vegetation concrete porosity measuring device provided by the invention can improve the accuracy and efficiency of vegetation concrete porosity measurement.

Description

Technical Field

[0001] The invention relates to the field of porosity measurement, in particular to a device and method for measuring the porosity of vegetation concrete. Background Art

[0002] Porosity is an important indicator of vegetated concrete. Its size can directly affect the plant's rooting ability and survival rate, and also affect the compressive strength of concrete.

[0003] Common porosity test methods include physical measurements such as drainage method, CT scanning method, and slicing method. The drainage method is time-consuming and has low measurement efficiency, especially for large-scale sample testing. The CT scanning method relies on manual operation, which is inefficient, and the subjectivity of threshold segmentation affects the analysis accuracy and stability. The slicing method is destructive and the test block cannot be reused; the stone chips generated during cutting and grinding are easy to clog the pores, affecting the pore structure analysis. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for measuring the porosity of vegetation concrete, which can improve the accuracy and efficiency of measuring the porosity of vegetation concrete.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A porosity determination device for vegetation concrete comprises a reference chamber and a sample chamber, wherein the reference chamber and the sample chamber are both sealed and independent glass containers, which are connected by a connecting pipe and are controlled on and off by a valve I; One side of the reference chamber is respectively connected to a first vacuum pipeline and an air charging pipeline; One side of the sample chamber is respectively connected with a second vacuum pipeline and a gas recovery pipeline.

[0006] The reference chamber is provided with a barometer I, and the sample chamber is provided with a barometer II.

[0007] The first vacuum pumping pipeline comprises a vacuum pump pipe I, which is connected to an external vacuum pump I, and a valve III is installed on the vacuum pump pipe I.

[0008] The inflation pipeline comprises an air inlet tank pipe, which is connected to an external inflation tank, in which inert gas is stored, and a valve II is installed on the air inlet tank pipe.

[0009] The second vacuum pumping pipeline comprises a vacuum pump pipe II, which is connected to an external vacuum pump II, and a valve IV is installed on the vacuum pump pipe II.

[0010] The gas recovery pipeline includes a vacuum pump tube III, which is connected to a vacuum pump III. A valve V is installed on the vacuum pump tube III. The other side of the vacuum pump III is connected to a recovery tank through a recovery tank tube. A gas filter is installed on the vacuum pump tube III.

[0011] After the porosity measurement is completed, the vacuum pump III (18) is started to draw the gas in the two chambers into the recovery tank (21), and the gas is passed through the gas filter (20) to remove impurities in the gas to ensure the purity of the recovered gas, thereby reducing gas waste and lowering experimental costs.

[0012] The connecting pipe, vacuum pump pipe II, vacuum pump pipe I, air intake tank pipe, vacuum pump pipe III and recovery tank pipe are all made of pressure-resistant materials, and the connections at both ends are sealed by sealing rings.

[0013] Valve Ⅰ, valve Ⅱ, valve Ⅲ, valve Ⅳ and valve Ⅴ are all electric valves.

[0014] A method for determining the porosity of vegetated concrete comprises the following steps: Step 1: Determine the volumes V1 and V2 of the reference chamber and the sample chamber, use a vernier caliper to measure the length, width and height of the concrete sample, calculate the natural volume Vs of the sample, put the sample into the sample chamber, and measure the air pressure of the sample chamber and the reference chamber when connected to the external environment to calibrate the barometer; open valve III and valve IV, start vacuum pump I and vacuum pump II, evacuate the sample chamber and the reference chamber, remove the gas in the two chambers, prevent interference with the measurement, and provide conditions for porosity measurement; Step 2: Close valve III and valve IV, open valve II on the air inlet pipe, open the air filling tank, fill the reference chamber with inert gas, and when the reading of the barometer I is stable, measure the air pressure P1 in the reference chamber at this time; Step 3: Close valve II and open valve I on the connecting pipe. Due to the pressure difference between the two chambers, the gas in the reference chamber enters the sample chamber and fully enters the pores of the vegetation concrete. When the readings of the barometers I and II in the two chambers are constant, the air pressure P2 is measured at this time. Step 4: Since the temperature of the two chambers is constant, the apparent volume of the concrete can be obtained by Boyle's law, and finally the porosity of the concrete can be obtained according to the porosity formula; Step 5. After the porosity measurement is completed, open valve V, start the vacuum pump III, and draw the inert gas in the sample chamber and the reference chamber into the recovery tank for reuse in the next experiment; finally, take out the sample from the sample chamber to complete the measurement.

[0015] A method for determining the porosity of vegetated concrete comprises the following steps: Step 1: Determine the volumes of the reference chamber and the sample chamber to correspond to V1 and V2, use a vernier caliper to measure the length, width and height of the concrete sample, calculate the natural volume Vs of the sample, put the sample into the sample chamber, and measure the air pressure of the sample chamber and the reference chamber when connected to the external environment to calibrate the barometer; open valve III and valve IV, start vacuum pump I and vacuum pump II, evacuate the sample chamber and the reference chamber, remove the gas in the two chambers, prevent interference with the measurement, and provide conditions for porosity measurement; Step 2: Close valve III and valve IV, open valve II on the air inlet pipe, open the air filling tank, fill the reference chamber with inert gas, and when the reading of the barometer I is stable, measure the air pressure P1 and temperature T1 in the reference chamber at this time; Step 3: Close valve II and open valve I on the connecting pipe. Due to the pressure difference between the two chambers, the gas in the reference chamber enters the sample chamber and fully enters the pores of the vegetation concrete. When the readings of the barometers I and II in the two chambers are constant, the air pressure P2 and the temperature T2 are measured at this time. Step 4: The apparent volume of concrete can be obtained through the ideal gas equation, and finally the porosity of concrete can be obtained according to the porosity formula; Step 5. After the porosity measurement is completed, open valve V, start the vacuum pump III, and draw the inert gas in the sample chamber and the reference chamber into the recovery tank for reuse in the next experiment; finally, take out the sample from the sample chamber to complete the measurement.

[0016] The present invention provides a device and method for measuring the porosity of vegetation concrete, which has the following technical effects: 1) The present invention eliminates interference by vacuum processing the sample chamber and the reference chamber, provides accurate environmental conditions for porosity measurement, avoids errors that may occur in traditional measurement methods, and ensures the accuracy and reliability of the measurement results.

[0017] 2) The present invention uses inert gas as the inflation gas, which will not have a negative impact on the environment compared to other gases, and meets the requirements of green environmental protection. In addition, the recycling of inert gas helps to improve experimental efficiency, reduce gas waste, and reduce experimental costs.

[0018] 3) The present invention adopts an electric valve to make the adjustment of gas flow more accurate and convenient. At the same time, it can improve the efficiency and repeatability of the experiment by cooperating with the automatic control system. The gas inlet and outlet are controlled by the automatic system, which reduces the errors and cumbersome processes of manual operation.

[0019] 4) The pipes in the present invention are made of pressure-resistant materials, have high corrosion resistance and mechanical strength, and are suitable for long-term use. At the same time, the sealing ring is made of silicone material, which can effectively prevent gas leakage and is resistant to high temperatures, ensuring the long-term stable operation of the device.

[0020] 5) The present invention is composed of a detachable main device, a charging and suction device, a measuring device and a pipeline, and has the advantages of easy maintenance, efficient operation, space saving, strong safety, etc. It can meet the needs of various application scenarios and provide long-term stable and reliable working performance.

[0021] 6) The patent "Device and method for measuring the volume and porosity of an object and a vacuum gas sealing method" with application number "CN201711071385.0" adopts a nested double container structure (i.e., the first measuring container completely wraps the second measuring container), and seals the opening of the air bag by pressing the internal and external pressure difference, and obtains gas parameters by combining the flow meter and the pressure sensor. However, in practical applications, the insufficient ductility of the air bag material can easily lead to local sealing failure and micro-leakage, destroy the stability of the vacuum environment and cause a decrease in measurement accuracy. At the same time, excessive ductility will press into the pores of the object, making it difficult to operate in practice. This application uses a dual-chamber structure, which operates independently to reduce interference and has a better sealing effect. It drives the gas flow through the pressure difference, can efficiently fill the concrete pores, avoids the measurement error caused by the complexity of the pores in the traditional method, improves accuracy, and has a simpler structure. Unlike the patent with application number "CN201711071385.0", the flow meter is installed, and there is no need to calculate the gas volume. It only needs to monitor the pressure changes in the two chambers to determine the porosity. Electric valves and automatic control are used to reduce manual intervention. At the same time, the inert gas filling and recovery system is used to achieve green environmental protection, recycling and waste reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the present invention.

[0023] Figure 2 It is a flow chart of the present invention.

[0024] In the figure: reference chamber 1, sample chamber 2, vacuum pump I3, charging tank 4, vacuum pump II5, valve III6, valve II7, valve I8, valve IV9, pressure gauge I10, connecting pipe 11, vacuum pump pipe II12, pressure gauge II13, vacuum pump pipe I14, air inlet tank pipe 15, vacuum pump pipe III16, valve V17, vacuum pump III18, recovery tank pipe 19, gas filter 20, recovery tank 21. DETAILED DESCRIPTION

[0025] Example 1 like Figure 1As shown, a porosity measuring device for vegetation concrete includes a main device, a filling and suction device, a measuring device and a pipeline. Among them, the main device includes a reference chamber 1 and a sample chamber 2. The filling and suction device includes a vacuum pump I3, a gas filling tank 4, a vacuum pump II5, a vacuum pump III18, a gas filter 20, and a recovery tank 21. The measuring device includes a pressure gauge I10 and a pressure gauge II13. The pipeline includes a valve III6, a valve II7, a valve I8, a valve IV9, a valve V17, a connecting pipe 11, a vacuum pump pipe II12, a vacuum pump pipe I14, an air inlet tank pipe 15, a vacuum pump pipe III16, and a recovery tank pipe 19.

[0026] The reference chamber 1 and the sample chamber 2 in the main device are both sealed independent glass containers, which are connected through a connecting pipe 11, and a valve Ⅰ8 is provided on the connecting pipe 11.

[0027] A barometer I 10 is installed on the reference chamber 1, and a barometer II 13 is installed on the sample chamber 2.

[0028] The reference chamber 1 is connected to the external vacuum pump Ⅰ3 through the vacuum pump pipe Ⅰ14; at the same time, it is connected to the external gas filling tank 4 through the air inlet tank pipe 15. The air inlet tank pipe 15 and the vacuum pump pipe Ⅰ14 of the reference chamber 1 are respectively equipped with valves Ⅱ7 and Ⅲ6, which control the inlet and outlet of gas.

[0029] The sample chamber 2 is connected to an external vacuum pump II 5 via a vacuum pump tube II 12. A valve IV 9 is installed on the vacuum pump tube II 12 of the sample chamber 2, and the valve IV 9 controls the inlet and outlet of gas.

[0030] The sample chamber 2 and the reference chamber 1 are sealed and connected via a connecting pipe 11, and sealing rings are used at the connection; the connection between the reference chamber 1 and the vacuum pump pipe Ⅰ14 and the air inlet tank pipe 15, and the connection between the sample chamber 2 and the vacuum pump pipe Ⅱ12 are all sealed with sealing rings.

[0031] The gas filling tank 4 of the charging and suction equipment provides inert gas such as helium to the reference chamber 1, and the vacuum pump performs vacuum treatment on the two chambers to eliminate interference. After the porosity measurement is completed, the vacuum pump III 18 draws the gas in the two chambers into the recovery tank 21 to reduce gas waste and reduce experimental costs. Among them, the gas filter 20 is used to remove impurities in the gas to ensure the purity of the recovered gas.

[0032] The valves I8, II7, III6, IV9 and V17 on the connecting pipe 11, the air inlet tank pipe 15, the vacuum pump pipe I14, the vacuum pump pipe II12 and the vacuum pump pipe III16 in the pipeline are all electric valves.

[0033] The barometer I10 in the measuring device is used to measure the air pressure in the reference chamber 1 , and the barometer II13 is used to measure the air pressure in the sample chamber 2 .

[0034] The connecting pipe 11, the air intake tank pipe 15, the vacuum pump pipe I 14, the vacuum pump pipe II 12, the vacuum pump pipe III 16 and the recovery tank pipe 19 are all made of pressure-resistant materials, and the sealing rings are made of silicone material, and O-type sealing rings are used to prevent gas leakage.

[0035] Example 2 like Figure 2 A method for measuring the porosity of vegetation concrete is implemented using the porosity measuring device and includes the following steps.

[0036] Step 1: Determine the volumes V1 and V2 of the reference chamber 1 and the sample chamber 2, use a vernier caliper to measure the length, width and height of the concrete sample, calculate the natural volume Vs of the sample, put the sample into the sample chamber 2, and measure the air pressure of the sample chamber 2 and the reference chamber 1 when connected to the external environment to calibrate the barometer; open valve III6 and valve IV9, start vacuum pump I3 and vacuum pump II5, vacuum the sample chamber 2 and the reference chamber 1, remove the gas in the two chambers, prevent interference with the measurement, and provide conditions for porosity measurement; Step 2, close valve III6 and valve IV9, open valve II7 on the air inlet pipe 15, open the air filling tank 4, fill the reference chamber 1 with inert gas, and when the reading of the barometer I10 is stable, measure the air pressure P1 in the reference chamber 1 at this time; Step 3: Close valve II7 and open valve I8 on connecting pipe 11. Due to the pressure difference between the two chambers, the gas in reference chamber 1 enters sample chamber 2 and fully enters the pores of vegetation concrete. When the readings of barometers I10 and II13 in the two chambers are constant, the air pressure P2 is measured. Step 4: Since the temperature of the two chambers is constant, Boyle's law can be used to obtain: , the apparent volume of concrete is measured Finally, the porosity of concrete is obtained according to the porosity formula .

[0037] Step 5: After the porosity measurement is completed, open valve V17, start the vacuum pump III18, and draw the inert gas in the sample chamber 2 and the reference chamber 1 into the recovery tank 21 for reuse in the next experiment. Finally, take out the sample from the sample chamber 2 to complete the measurement.

[0038] Example 3 A method for measuring porosity of vegetation concrete takes temperature changes into consideration. The method is implemented using the porosity measuring device and includes the following steps.

[0039] Step 1: Determine the volumes of reference chamber 1 and sample chamber 2 to correspond to V1 and V2, use a vernier caliper to measure the length, width and height of the concrete sample, calculate the natural volume Vs of the sample, put the sample into sample chamber 2, and measure the air pressure of sample chamber 2 and reference chamber 1 when connected to the external environment to calibrate the barometer; open valve III6 and valve IV9, start vacuum pump I3 and vacuum pump II5, evacuate sample chamber 2 and reference chamber 1, remove the gas in the two chambers, prevent interference with the measurement, and provide conditions for porosity measurement; Step 2, close valve III6 and valve IV9, open valve II7 on the air inlet pipe 15, open the air filling tank 4, fill the reference chamber 1 with inert gas, and when the reading of the barometer I10 is stable, measure the air pressure P1 and temperature T1 in the reference chamber 1 at this time; Step 3: Close valve II7 and open valve I8 on connecting pipe 11. Due to the pressure difference between the two chambers, the gas in reference chamber 1 enters sample chamber 2 and fully enters the pores of vegetation concrete. When the readings of barometers I10 and II13 in the two chambers are constant, the air pressure P2 and the temperature T2 are measured at this time. Step 4: Through the ideal gas equation, we can get: , the apparent volume of concrete is measured Finally, the porosity of concrete is obtained according to the porosity formula .

[0040] Step 5: After the porosity measurement is completed, open valve V17, start the vacuum pump III18, and draw the inert gas in the sample chamber 2 and the reference chamber 1 into the recovery tank 21 for reuse in the next experiment. Finally, take out the sample from the sample chamber 2 to complete the measurement.

Claims

1. A device for measuring porosity of vegetation concrete, characterized in that: It includes a reference chamber (1), a sample chamber (2), a vacuum pump I (3), an air filling tank (4), a vacuum pump II (5), a valve III (6), a valve II (7), a valve I (8), a valve IV (9), a pressure gauge I (10), a connecting pipe (11), a vacuum pump pipe II (12), a pressure gauge II (13), a vacuum pump pipe I (14), an air inlet tank pipe (15), a vacuum pump pipe III (16), a valve V (17), a vacuum pump III (18), a recovery tank pipe (19), a gas filter (20), and a recovery tank (21).

2. The porosity measuring device for vegetation concrete according to claim 1, characterized in that: The reference chamber (1) and the sample chamber (2) are both sealed independent glass containers. The reference chamber (1) and the sample chamber (2) are connected via a connecting pipe (11) and are controlled on and off by a valve I (8); One side of the reference chamber (1) is respectively connected to a first vacuum pipeline and a gas charging pipeline; One side of the sample chamber (2) is respectively connected to a second vacuum pipeline and a gas recovery pipeline.

3. The porosity measuring device for vegetation concrete according to claim 1, characterized in that: The reference chamber (1) is provided with a barometer I (10), and the sample chamber (2) is provided with a barometer II (13).

4. The porosity measuring device for vegetation concrete according to claim 2, characterized in that: The first vacuum pipeline comprises a vacuum pump pipe I (14), which is connected to an external vacuum pump I (3), and a valve III (6) is installed on the vacuum pump pipe I (14); the gas charging pipeline comprises an air inlet tank pipe (15), which is connected to an external gas charging tank (4), inert gas is stored in the gas charging tank (4), and a valve II (7) is installed on the air inlet tank pipe (15).

5. The porosity measuring device for vegetation concrete according to claim 4, characterized in that: The second vacuum pumping pipeline comprises a vacuum pump pipe II (12), the vacuum pump pipe II (12) is connected to an external vacuum pump II (5), and a valve IV (9) is installed on the vacuum pump pipe II (12).

6. The device for measuring porosity of vegetation concrete according to claim 5, characterized in that: The gas recovery pipeline comprises a vacuum pump tube III (16), the vacuum pump tube III (16) is connected to a vacuum pump III (18), a valve V (17) is installed on the vacuum pump tube III (16), and the other side of the vacuum pump III (18) is connected to a recovery tank (21) via a recovery tank tube (19); a gas filter (20) is installed on the vacuum pump tube III (16).

7. The device for measuring porosity of vegetation concrete according to claim 6, characterized in that: After the porosity measurement is completed, the vacuum pump III (18) is started to draw the gas in the two chambers into the recovery tank (21) and pass through the gas filter (20) to remove impurities in the gas.

8. The device for measuring porosity of vegetation concrete according to claim 7, characterized in that: The connecting pipe (11), vacuum pump pipe II (12), vacuum pump pipe I (14), air inlet tank pipe (15), vacuum pump pipe III (16) and recovery tank pipe (19) are all made of pressure-resistant materials, and the joints at both ends are sealed by sealing rings; valve I (8), valve II (7), valve III (6), valve IV (9) and valve V (17) are all electric valves.

9. The method for measuring porosity of a vegetation concrete porosity measuring device according to claim 8 comprises the following steps: Step 1: Determine the volumes V1 and V2 of the reference chamber (1) and the sample chamber (2); use a vernier caliper to measure the length, width and height of the concrete sample; calculate the natural volume Vs of the sample; place the sample in the sample chamber (2); and measure the air pressure of the sample chamber (2) and the reference chamber (1) when connected to the external environment to calibrate the pressure gauge; open valve III (6) and valve IV (9), start vacuum pump I (3) and vacuum pump II (5), evacuate the sample chamber (2) and the reference chamber (1), remove the gas in the two chambers, prevent interference with the measurement, and provide conditions for porosity measurement; Step 2: Close valve III (6) and valve IV (9), open valve II (7) on the air inlet pipe (15), open the air filling tank (4), fill the reference chamber (1) with inert gas, and when the reading of the barometer I (10) is stable, measure the air pressure P1 in the reference chamber (1) at this time; Step 3: Close valve II (7) and open valve I (8) on the connecting pipe (11). Due to the pressure difference between the two chambers, the gas in the reference chamber (1) enters the sample chamber (2) and fully enters the pores of the vegetation concrete. When the readings of the barometers I (10) and II (13) in the two chambers are constant, the air pressure P2 is measured at this time. Step 4: Since the temperature of the two chambers is constant, Boyle's law can be used to obtain: , the apparent volume of concrete is measured Finally, the porosity of concrete is obtained according to the porosity formula ; Step 5. After the porosity measurement is completed, open valve V (17) and start the vacuum pump III (18) to draw the inert gas in the sample chamber (2) and the reference chamber (1) into the recovery tank (21) for reuse in the next experiment; finally, take out the sample from the sample chamber (2) to complete the measurement.

10. The method for measuring porosity of a vegetation concrete porosity measuring device according to claim 8, taking temperature changes into consideration, comprises the following steps: Step 1: Determine the volumes of the reference chamber (1) and the sample chamber (2) to correspond to V1 and V2, use a vernier caliper to measure the length, width and height of the concrete sample, calculate the natural volume Vs of the sample, place the sample in the sample chamber (2), and measure the air pressure of the sample chamber (2) and the reference chamber (1) when connected to the external environment to calibrate the barometer; open valve III (6) and valve IV (9), start vacuum pump I (3) and vacuum pump II (5), evacuate the sample chamber (2) and the reference chamber (1), remove the gas in the two chambers, prevent interference with the measurement, and provide conditions for porosity measurement; Step 2: Close valve III (6) and valve IV (9), open valve II (7) on the air inlet pipe (15), open the air filling tank (4), fill the reference chamber (1) with inert gas, and when the reading of the barometer I (10) is stable, measure the air pressure P1 and temperature T1 in the reference chamber (1); Step 3: Close valve II (7) and open valve I (8) on the connecting pipe (11). Due to the pressure difference between the two chambers, the gas in the reference chamber (1) enters the sample chamber (2) and fully enters the pores of the vegetation concrete. When the readings of the barometers I (10) and II (13) in the two chambers are constant, the air pressure P2 and the temperature T2 are measured at this time. Step 4: Through the ideal gas equation, we can get: , the apparent volume of concrete is measured Finally, the porosity of concrete is obtained according to the porosity formula ; Step 5. After the porosity measurement is completed, open valve V (17) and start the vacuum pump III (18) to draw the inert gas in the sample chamber (2) and the reference chamber (1) into the recovery tank (21) for reuse in the next experiment; finally, take out the sample from the sample chamber (2) to complete the measurement.

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