CN209911193U - A test instrument for concrete porosity - Google Patents
A test instrument for concrete porosity Download PDFInfo
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- CN209911193U CN209911193U CN201920556546.3U CN201920556546U CN209911193U CN 209911193 U CN209911193 U CN 209911193U CN 201920556546 U CN201920556546 U CN 201920556546U CN 209911193 U CN209911193 U CN 209911193U
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Abstract
The utility model discloses a test instrument for concrete porosity. The device comprises a fixing unit for fixing a concrete sample (test piece), a buffer gas tank, a gas storage tank, a gas pipeline, a barometer and a gas switch, wherein the fixing unit comprises an upper cover, a unit main body, a lower seat and a fixing bolt; the buffer gas tank is connected with the fixed unit through a gas pipeline respectively, the gas storage tank is communicated with the inner cavity of the unit main body of the buffer gas tank and the inner cavity of the fixed unit respectively, an upper gas inlet switch and a barometer I are arranged on the upper gas inlet pipeline, a confining pressure pressurizing switch and a barometer II are arranged on the confining pressure pressurizing pipeline, and a gas supply switch is arranged on the gas supply pipeline. The utility model discloses can acquire the porosity of concrete sample fast, portably, it has characteristics such as simple structure, equipment convenience and work safe and reliable.
Description
Technical Field
The utility model relates to a test instrument for concrete porosity.
Background
The concrete pore structure is directly related to important performances of the concrete such as strength, durability and the like, wherein the porosity is an important parameter for evaluating the concrete pore structure and directly determines the performances of the concrete such as compressive strength, impermeability, heat preservation, heat insulation and the like. The utility model discloses a testing arrangement of cement concrete intercommunication porosity permeates water in chinese utility model patent specification CN205449726U, and it includes the water tank, is equipped with water inlet and outlet on the water tank, is equipped with heating device in the water tank, is equipped with weighing system at the top of water tank, has hung on weighing system and has connect and hang the basket, hangs the basket and is used for holding the cement concrete test piece that permeates water of being surveyed. The utility model discloses a setting can be put whole experimental full water process and stoving process and realize in an instrument, and current equipment relatively, it is more laborsaving, high-efficient, the precision is higher. The existing concrete porosity testing method mainly comprises a mercury pressure method, a nitrogen adsorption method, a vacuum bottle method, a water saturation method and the like. Although the methods can obtain the porosity of concrete, the pore structure areas which can be researched by the mercury intrusion method and nitrogen adsorption are limited, only micropores from micrometer to nanometer can be researched, but pores formed in the concrete pouring process cannot be detected, and in addition, concrete tests of the mercury intrusion method and nitrogen adsorption tests are small and are difficult to represent; the vacuum bottle method also has the problems that large pores of concrete are difficult to detect, and simultaneously, test sampling is small. Although the water saturation method can obtain the porosity of the concrete through simple calculation, the water saturation process is too long, and the porosity of the concrete in different stress states is difficult to test.
SUMMERY OF THE UTILITY MODEL
To the above prior art, the to-be-solved technical problem of the utility model is to provide a test instrument for concrete porosity. It has the characteristics of simple structure, convenient assembly, safe and reliable work and the like. The method can quickly and simply obtain the multi-scale pore volume of the large concrete sample (test piece) from the millimeter-scale air hole to the nanometer-scale gel hole, further obtain the porosity of the concrete sample, and can realize the crack closure of the concrete sample (test piece) by applying the confining pressure change of the concrete sample, thereby reducing the influence of the crack of the concrete sample (test piece) on the porosity. And gas is used as confining pressure, so that the risk of polluting a concrete sample (test piece) due to leakage of liquid confining pressure in the test process is avoided.
In order to solve the technical problem, the utility model provides a test instrument for concrete porosity. The device comprises a fixing unit for fixing a concrete sample (test piece), a buffer gas tank, a gas storage tank (preferably a helium gas storage tank), a gas pipeline, a barometer and a gas switch, wherein the fixing unit comprises an upper cover, a unit main body, a lower seat and a fixing bolt; the gas pipeline includes last air inlet pipeline, the pipeline of admitting air down, confined pressure pressurization pipeline and air supply line, the gas switch includes last air inlet switch, air inlet switch down, confined pressure pressurization switch and air feed switch, the barometer includes barometer I and barometer II, the buffer gas jar is connected with fixed unit through the gas pipeline respectively, the unit main part inner chamber with buffer gas jar and fixed unit is linked together respectively to gas holder (preferred helium gas holder), last air feed switch and the barometer I of establishing on the last air inlet pipeline, air feed switch is established down on the lower air inlet pipeline, confined pressure pressurization switch and barometer II are established on the confined pressure pipeline, air feed switch is established on the air supply line.
The upper side and the lower side of the concrete sample are both provided with gas dispersible tablets, the upper surface of the test rock sample is provided with a pressure head, the concrete sample is fixedly arranged on a lower seat through a base, and the concrete sample is sealed by adopting a rubber leather sheath and a metal hoop.
The buffer gas tank is used for providing pressure for porosity testing, the upper end of the buffer gas tank is connected with a concrete sample (test piece) in the fixed unit through an upper gas inlet pipeline, and the lower end of the buffer gas tank is connected with the concrete sample (test piece) in the fixed unit through a lower gas inlet pipeline.
And the gas storage tank (preferably a helium gas storage tank) is used for providing gas supply for the buffer gas tank and also providing confining pressure gas for the fixed unit main body.
The barometer is used for measuring the pressure of gas, wherein the barometer I is used for testing the gas pressure of the buffer gas tank; the barometer II is used to measure the confining pressure within the cell body of the fixation unit.
The gas switch is used for controlling the flow of gas in the pipeline, wherein an upper gas inlet pipeline of the upper gas inlet switch control fixing unit, a lower gas inlet pipeline of the lower gas inlet switch control fixing unit, the gas supply switch controls the gas storage tank to be a gas supply pipeline of the buffer gas tank, and the confining pressure pressurizing switch controls the confining pressure pressurizing pipeline in the unit main body of the fixing unit.
Compared with the prior art, the utility model discloses the beneficial effect who produces is: since the structure is adopted, the utility model discloses can obtain large-scale concrete test block fast, portably from millimeter level gas pocket to the pore volume of nanometer gel hole multiscale, and then acquire the porosity of concrete sample, change through the confined pressure of applying the concrete sample in addition, can realize that the crack of concrete sample is closed, reduce the influence of concrete sample crack to the porosity. And gas is used as confining pressure, so that the risk of polluting a concrete test piece due to liquid confining pressure leakage in the test is avoided.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the enlarged structure of the concrete sample (specimen) of the present invention;
in the figure: 1-upper cover, 2-unit body, 3-concrete sample (test piece), 4-fixing bolt, 5-lower seat, 6-base, 7-barometer II, 8-confining pressure pressurization pipeline, 9-air supply pipeline, 10-air supply switch, 11-confining pressure pressurization switch, 12-air storage tank, 13-buffer air tank, 14-upper air supply pipeline, 15-barometer I, 16-upper air supply switch, 17-lower air supply switch, 18-lower air supply pipeline, 19-rubber leather sheath, 20-gas dispersing tablet, 21-pressure head and 22-metal hoop.
Detailed Description
The following describes the present invention in further detail with reference to the accompanying drawings.
Fig. 1 and 2 show various schematic structural diagrams of the present invention. As shown in fig. 1 and 2, the present invention provides a test instrument for concrete porosity. The device comprises a fixing unit for fixing a concrete sample 3 (test piece), a buffer gas tank 13, a gas storage tank 12 (preferably a helium gas storage tank 12), a gas pipeline, a barometer and a gas switch, wherein the fixing unit comprises an upper cover 1, a unit main body 2, a lower seat 5 and a fixing bolt 4, the lower seat 5 is provided with the unit main body 2, the unit main body 2 is provided with the upper cover 1, the lower seat 5 is connected with the upper cover 1 through the fixing bolt 4, the unit main body 2 is internally provided with the concrete sample 3 (test piece), and the concrete sample 3 (test piece) is arranged on the lower seat 5; the gas pipeline comprises an upper gas inlet pipeline 14, a lower gas inlet pipeline 18, a confining pressure pressurizing pipeline 8 and a gas supply pipeline 9, the gas switch comprises an upper gas inlet switch 16, a lower gas inlet switch 17, a confining pressure pressurizing switch 11 and a gas supply switch 10, the barometer comprises a barometer I15 and a barometer II7, the buffer gas tank 13 is respectively connected with the fixed unit through the gas pipeline, the gas storage tank 12 (preferably a helium gas storage tank 12) is respectively communicated with the inner cavities of the unit main bodies 2 of the buffer gas tank 13 and the fixed unit, the upper gas inlet switch 16 and the barometer I15 are arranged on the upper gas inlet pipeline 14, the lower gas inlet pipeline 18 is provided with the lower gas inlet switch 17, the confining pressure pressurizing pipeline 8 is provided with the confining pressure pressurizing switch 11 and the barometer II7, and the gas supply switch 10 is arranged on the. The upper and lower sides of the concrete sample 3 (test piece) are both provided with gas dispersible tablets 20, and the gas dispersible tablets 20 disperse gas and then uniformly disperse the gasFrom the entire surface of the concrete sample 3, not from that point of the trachea. The upper surface of the concrete sample 3 is provided with a pressure head 21, the concrete sample 3 (test piece) is fixedly arranged on the lower seat 5 through the base 6, and the rubber leather sheath 19 and the metal hoop 22 are used for sealing. Namely, the upper and lower sides of the concrete sample 3 (test piece) are provided with the gas dispersible tablets 20 to disperse the gas inlet path, so that the gas inlet path is more uniform (as shown in fig. 2). The total volume in the closed gas line formed by the upper inlet switch 16, the lower inlet switch 17 and the supply switch 10, including the volume of the buffer gas tank 13 and the volume of the gas line connected thereto, has been determined by the standard V1. The diameter of the concrete sample 3 (test piece) is 50cm, and the height is 20-100 mm. The buffer gas tank 13 is used for providing pressure for porosity testing, the upper end of the buffer gas tank 13 is connected with the concrete sample 3 (test piece) in the fixing unit through the upper gas inlet pipeline 14, and the lower end of the buffer gas tank 13 is connected with the concrete sample 3 (test piece) in the fixing unit through the lower gas inlet pipeline 18. The gas tank 12 (preferably a helium gas tank 12) is used to provide a supply of gas to the buffer tank 13 and also to provide confining pressure gas within the fixed unit body 2. The barometer is used for measuring the pressure of the gas, wherein the barometer I15 is used for testing the gas pressure of the buffer gas tank 13; barometer II7 is used to measure the confining pressure within the cell body 2 of the fixation unit. The gas switch is used for controlling the flow of gas in the pipeline, wherein an upper gas inlet switch 16 controls an upper gas inlet pipeline 14 of the fixed unit, a lower gas inlet switch 17 controls a lower gas inlet pipeline 18 of the fixed unit, a gas supply switch 10 controls a gas storage tank 12 to be a gas supply pipeline 9 of a buffer gas tank 13, and a confining pressure pressurizing switch 11 controls a confining pressure pressurizing pipeline 8 in a unit main body 2 of which the gas storage tank 12 is the fixed unit. The utility model discloses a can obtain large-scale concrete test block fast, portably from millimeter level gas pocket to the pore volume of nanometer gel hole multiscale, and then acquire concrete sample 3's porosity, change through applying concrete sample 3's confining pressure in addition, can realize that the crack of concrete sample is closed, reduce the influence of concrete sample crack to the porosity. Gas is used as confining pressure, so that the phenomenon that liquid is leaked due to confining pressure in a test and is polluted is avoidedRisk of staining the concrete specimen.
The utility model provides a can test the test instrument of bulky concrete test piece porosity realizes the high accuracy quick test of the centimetre level test block porosity of concrete, simultaneously, can also test the porosity of concrete under different stress state or the fracture state. The testing principle is an ideal gas equation, namely, the change of the gas volume is reversely deduced by utilizing the change of the gas pressure:
PV＝nRT
where P is the pressure of the ideal gas, typically in atm or kPa; v is the volume of the ideal gas, and the unit is L;
n is the amount of gas substances in the ideal gas, and the unit is mol; r is an ideal gas constant, 8.314J/mol.K; t is the absolute temperature of the ideal gas in K.
The test steps of the porosity of the concrete sample 3 (test piece) are as follows:
(1) the installation fixing unit is as shown in fig. 1, a cylindrical steel test piece with the same volume as the concrete test piece is installed, and all gas switches are determined to be closed.
(2) Turning on the confining pressure pressurizing switch 11 to provide confining pressure Pv for the inner cavity of the fixing unit main body 2, and then turning off the confining pressure pressurizing switch 11; recording the reading pressure Pv of the barometer II 7;
(3) the air supply switch 10 is opened to provide pressure P for the buffer air tank 131And guarantee P1Less than PV(ii) a Closing the gas supply switch 10, and recording the reading pressure P1 of the barometer I15 after the gas pressure is stable;
(4) the lower air inlet switch 17 and the upper air inlet switch 16 are opened, and after the air pressure is stabilized, the reading pressure P of the barometer 1 is recorded2(ii) a According to an ideal gas equation and the following formula, the equal volume V of the sealed gas pipeline of the lower gas inlet switch 17 and the upper gas inlet switch 16 and the equal volume V of the gas dispersing tablets 20 are calculated2Comprises the following steps:
(5) closing the lower air inlet switch 17 and the upper air inlet switch 16, disassembling the fixing unit, taking out the cylindrical steel test piece, installing the concrete test piece in the fixing unit, and connecting the gas pipeline as shown in figure 1;
(6) the confining pressure pressurizing switch 11 is turned on to provide confining pressure P for the inner cavity of the fixing unit main body 2VClosing the confining pressure pressurizing switch 11, and recording the reading pressure Pv of the barometer II 7;
(7) the air supply switch 10 is opened to provide pressure P for the buffer air tank 131And guarantee P1Less than PV(ii) a Closing the gas supply switch 10, and recording the reading pressure P1 of the barometer I15 after the gas pressure is stable;
(8) the lower air inlet switch 17 and the upper air inlet switch 16 are opened, and after 60 minutes, the reading of the barometer 1 is recorded to display the pressure P3Calculating the pore volume V of the concrete sample according to an ideal gas equation and the following formula3Comprises the following steps:
(9) the diameter D and the height H of the concrete test piece are measured by a vernier caliper, and the volume V of the test piece is calculatedS：
(10) Calculating the porosity phi of the concrete sample:
the embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art.
Claims (7)
1. The utility model provides a test instrument for concrete porosity, it is including the fixed unit, buffer gas jar (13), gas holder (12), gas pipeline, barometer and the gas switch that are used for fixed concrete sample (3), its characterized in that: the fixing unit comprises an upper cover (1), a unit main body (2), a lower seat (5) and a fixing bolt (4), the unit main body (2) is arranged on the lower seat (5), the upper cover (1) is arranged on the unit main body (2), the lower seat (5) is connected with the upper cover (1) through the fixing bolt (4), a concrete sample (3) is arranged in the unit main body (2), and the concrete sample (3) is arranged on the lower seat (5); the gas pipeline comprises an upper gas inlet pipeline (14), a lower gas inlet pipeline (18), a confining pressure pressurization pipeline (8) and a gas supply pipeline (9), the gas switch comprises an upper gas inlet switch (16), lower inlet switch (17), confined pressure increase switch (11) and air feed switch (10), the barometer includes barometer I (15) and barometer II (7), buffer gas pitcher (13) are connected with fixed unit through gas pipeline respectively, gas holder (12) are linked together with buffer gas pitcher (13) and fixed unit's unit main part (2) inner chamber respectively, last inlet switch (16) and barometer I (15) are established on last inlet pipeline (14), lower inlet switch (17) are established on lower inlet pipeline (18), confined pressure increase switch (11) and barometer II (7) are established on confined pressure increase pipeline (8), air feed switch (10) are established on air supply pipeline (9).
2. The test instrument for concrete porosity according to claim 1, wherein: the upper side and the lower side of the concrete sample (3) are respectively provided with a gas dispersing tablet (20), a pressure head (21) is arranged on the concrete sample (3), the concrete sample (3) is fixedly arranged on the lower seat (5) through a base (6), and a rubber leather sleeve (19) and a metal hoop (22) are adopted for sealing.
3. The test instrument for concrete porosity according to claim 1, wherein: buffer gas pitcher (13) are used for providing pressure for the porosity test, and buffer gas pitcher (13) upper end is connected with concrete sample (3) in the fixed unit through last air inlet pipeline (14), and buffer gas pitcher (13) lower extreme is connected with concrete sample (3) in the fixed unit through air inlet pipeline (18) down.
4. The test instrument for concrete porosity according to claim 1, wherein: the gas storage tank (12) is used for providing gas supply for the buffer gas tank (13) and providing confining pressure gas for the fixed unit main body (2).
5. The test instrument for concrete porosity according to claim 1, wherein: the barometer is used for measuring the pressure of the gas, wherein the barometer I (15) is used for testing the gas pressure of the buffer gas tank (13); the barometer II (7) is used to measure the confining pressure within the unit body (2) of the fixation unit.
6. The test instrument for concrete porosity according to claim 1, wherein: the gas switch is used for controlling the flow of gas in a pipeline, wherein an upper gas inlet switch (16) controls an upper gas inlet pipeline (14) of the fixed unit, a lower gas inlet switch (17) controls a lower gas inlet pipeline (18) of the fixed unit, a gas supply switch (10) controls a gas storage tank (12) to be a gas supply pipeline (9) of a buffer gas tank (13), and a confining pressure pressurizing switch (11) controls a confining pressure pressurizing pipeline (8) in a unit main body (2) of the fixed unit, wherein the gas storage tank (12) is a confining pressure pressurizing pipeline (8).
7. A test apparatus for concrete porosity according to any of claims 1 to 6, wherein: the diameter of the concrete sample (3) is 50cm, and the height of the concrete sample is 20-100 mm.
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| CN201920023557 | 2019-01-08 | ||
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959578A (en) * | 2019-01-08 | 2019-07-02 | 江苏城工建设科技有限公司 | A kind of test equipment and its test method for rock gas High Pressure Absorption |
| CN111610131A (en) * | 2020-06-01 | 2020-09-01 | 浙江大学 | Soil porosity nondestructive testing device and method thereof |
| CN114778433A (en) * | 2022-04-28 | 2022-07-22 | 中国矿业大学 | Device and method for testing mechanical behavior of hydrogen storage sealing layer |
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2019
- 2019-04-23 CN CN201920556546.3U patent/CN209911193U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959578A (en) * | 2019-01-08 | 2019-07-02 | 江苏城工建设科技有限公司 | A kind of test equipment and its test method for rock gas High Pressure Absorption |
| CN109959578B (en) * | 2019-01-08 | 2024-04-30 | 江苏城工建设科技有限公司 | Testing instrument for rock gas high-pressure adsorption and testing method thereof |
| CN111610131A (en) * | 2020-06-01 | 2020-09-01 | 浙江大学 | Soil porosity nondestructive testing device and method thereof |
| CN111610131B (en) * | 2020-06-01 | 2021-04-13 | 浙江大学 | Soil porosity nondestructive testing device and method thereof |
| CN114778433A (en) * | 2022-04-28 | 2022-07-22 | 中国矿业大学 | Device and method for testing mechanical behavior of hydrogen storage sealing layer |
| CN114778433B (en) * | 2022-04-28 | 2023-09-22 | 中国矿业大学 | Hydrogen storage sealing layer mechanical behavior testing device and method |
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