CN211179447U - Partially saturated cement-based material permeability coefficient measuring test device - Google Patents
Partially saturated cement-based material permeability coefficient measuring test device Download PDFInfo
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- CN211179447U CN211179447U CN201921609589.XU CN201921609589U CN211179447U CN 211179447 U CN211179447 U CN 211179447U CN 201921609589 U CN201921609589 U CN 201921609589U CN 211179447 U CN211179447 U CN 211179447U
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Abstract
A testing device for determining the permeability coefficient of a partially saturated cement-based material comprises a testing barrel body, a water injection pressurizing unit, a sensor and a controller with a control panel, wherein a determination test piece is arranged in the testing barrel body; the controller comprises a time control unit and a pressure control unit, wherein a signal input end of the pressure control unit is connected with a pressure sensor arranged in the test barrel, a signal output end of the controller is connected with a control end of a booster pump of the water injection booster unit, and a signal input and output end of the time control unit and a signal input and output end of the pressure control unit are connected with a control end of a control panel. The utility model can guarantee the effectiveness of sealing and accurately control the water pressure; simple structure, extensive applicability and simple operation.
Description
Technical Field
The utility model relates to a cement-based material osmotic coefficient survey test device of partial saturation, in particular to can survey the cement-based material osmotic coefficient survey test device that has different saturation or different porosities.
Background
The durability of concrete depends on its ability to resist the intrusion of chemicals. The transport properties of concrete, mainly permeability, play a key role in assessing and predicting the durability of reinforced concrete structures. The moisture state of concrete affects transport parameters such as permeability, which has a large effect on the durability of the concrete. Among them, the water permeability of concrete is one of the most important parameters for evaluating its resistance to aggressive substances (such as chloride ions, water vapor, etc.). In actual engineering, the water content of the concrete material can change along with the change of time according to the environment where the concrete material is located. Meanwhile, the saturation of concrete plays a crucial role in the transport performance. Tests prove that the humidity inside the concrete is mainly concentrated on 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90% after the concrete is respectively exposed in a tidal zone, a splash zone and an atmospheric zone for five years and ten years, which is enough to prove the necessity of researching the influence of saturation on the durability of the concrete. Therefore, it is increasingly important to measure the water permeability of partially saturated concrete materials.
When pressure is exerted on the partially saturated concrete, on the one hand, water flows into the pores already filled with water due to the effect of the pressure; on the other hand, water flows into the empty pores due to capillary action. Thus, the measured flow rate comprises two components, one being the "percolation" flow rate through a saturated pore and the other being the "capillary suction" flow rate through an empty pore. Whereas the experiment assumes that the water flow rate due to capillary action (capillary action) does not contribute to the effective water permeability, which is therefore determined only by the permeation rate under pressure.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model discloses a main aim at provides a simple structure, stability is good, degree of automation is high, can survey the test device of the cement-based material osmotic coefficient of different closely knit degree and different saturation.
The utility model provides a technical scheme that its technical problem adopted is:
a test device for determining the permeability coefficient of a partially saturated cement-based material comprises a test barrel body, a water injection pressurizing unit, a sensor and a controller with a control panel, wherein a determination test piece is arranged in the test barrel body, a confining pressure water inlet of the test barrel body is connected with the water injection pressurizing unit, a first water inlet and a second water inlet of the test barrel body are connected with the sensor, and the sensor is connected with the water injection pressurizing unit; the controller comprises a time control unit and a pressure control unit, wherein a signal input end of the pressure control unit is connected with a pressure sensor arranged in the test barrel, a signal output end of the controller is connected with a control end of a booster pump of the water injection booster unit, and a signal input and output end of the time control unit and a signal input and output end of the pressure control unit are connected with a control end of the control panel.
Further, the test barrel body comprises a pressure barrel with cover plates at two ends and a pressure plate arranged in the pressure barrel, and the cover plates are provided with water inlets and exhaust water drain valves which are used for being communicated with the sensors; the center of the pressure plate is provided with a through hole, the pressure plate is fixedly connected with one cover plate, and the test piece is clamped between the pressure plate and the cover plate.
Further, the water injection pressurizing unit comprises a water inlet pipe, a water inlet tank, a pressurizing pump, a high-pressure water storage tank and a connecting pipe which are communicated with an external water source, the water inlet tank is connected with a water inlet pipeline of the pressurizing pump, a water outlet of the pressurizing pump is connected with the high-pressure water storage tank pipeline, and a water outlet of the high-pressure water storage tank is connected with a water inlet of the sensor through the connecting pipe.
The sensor is provided with a time control unit and a water flow control unit, and can accurately measure the water flow in unit time at each moment;
the pressure barrel comprises a barrel body with two open ends, a pressure plate, a first cover plate and a second cover plate, wherein the first cover plate is provided with a first water inlet, a first exhaust water relief valve, a confining pressure water inlet and a confining pressure exhaust water relief valve, and the second cover plate is provided with a second water inlet and a second exhaust water relief valve; the second cover plate is connected with one end of the barrel body through welding; the first cover plate is covered on the other end of the barrel body, and the first cover plate and the second cover plate are fixedly connected in a sealing mode through a first bolt with a first nut; the pressure plate is fixedly connected with the inner surface of the first cover plate through a second bolt with a second nut, a test piece is clamped between the pressure plate and the first cover plate, and the contact part of the test piece, the pressure plate and the first cover plate is kept sealed; the pressure disk with the test piece between, first apron with the test piece between all accompany the sealing washer.
The inner surface of the first cover plate is provided with two rings of annular grooves, and the two rings of annular grooves on the inner surface of the first cover plate are respectively provided with a first rubber ring and a second rubber ring.
The pressure disk side surface be equipped with round annular groove, pressure disk side surface on be equipped with the round annular groove that is equipped with and be furnished with the third rubber circle.
The distance between the pressure plate and the first cover plate is 0-95 mm, and the distance between the pressure plate and the first cover plate is adjusted through a second bolt; the height of the test piece is adjusted randomly between 0mm and 95 mm; the sealing rings are all processed by high-toughness silica gel; the test water pressure range in the pressure barrel is 0-5 MPa.
The beneficial effects of the utility model are that: the sealing effectiveness can be ensured, and the water pressure can be accurately controlled; in addition, the utility model can study the influence of the thickness of the test piece on the water permeability coefficient, and is suitable for the permeability test of cement-based materials with different porosities; more importantly, the utility model can be suitable for the permeability tests of cement-based materials with different saturation under different confining pressures; the utility model discloses simple structure, extensive applicability, it is easy and simple to handle, provide a new test method and testing arrangement for the osmotic coefficient of survey partial saturation's cement-based material.
Drawings
Fig. 1 is a schematic view of the present invention.
Fig. 2 is a bottom view of the first cover plate of the testing device of the present invention.
Fig. 3 is a top view of the first cover plate of the testing device of the present invention.
Fig. 4 is a plan view of the second cover plate of the testing device of the present invention.
Fig. 5 is a bottom view of the second cover plate of the testing device of the present invention.
Fig. 6 is a plan view of a pressure plate of the testing apparatus of the present invention.
Fig. 7 is a cross-sectional view of the testing device of the present invention.
Fig. 8 is a frame diagram of the testing apparatus of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 8, a test device for determining permeability coefficient of partially saturated cement-based material comprises a test barrel body, a water injection pressurizing unit, a sensor and a controller with a control panel, wherein a determination test piece 23 is arranged in the test barrel body, a confining pressure water inlet 3 of the test barrel body is connected with the water injection pressurizing unit, a first water inlet 1 and a second water inlet 11 of the test barrel body are connected with the sensor 24, and the sensor 24 is connected with the water injection pressurizing unit; the controller include time control unit 29 and pressure control unit 30, pressure control unit signal input part link to each other with the pressure sensor 25 that sets up in experimental barrel, the signal output part of controller with the control end of booster pump 27 of water injection pressure boost unit link to each other, time control unit's signal input output part pressure control unit's signal input output part all with control panel's control end connect.
The test barrel body comprises a first cover plate 10, a second cover plate 14, a pressure barrel 13 between the cover plates and a pressure plate 20 arranged in the pressure barrel 13, wherein the first cover plate 10 is provided with a first water inlet 1 and a first exhaust and drain valve 2 which are used for being communicated with a sensor 24, and the second cover plate 14 is provided with a second water inlet 11 and a second exhaust and drain valve 12 which are used for being communicated with the sensor 24; the center of the pressure plate 20 is provided with a through hole, the pressure plate 20 is fixedly connected with the first cover plate 10, and the test piece 23 is clamped between the pressure plate 20 and the first cover plate 10.
The water injection pressurization system comprises a water inlet tank 28, a booster pump 27, a high-pressure water storage tank 26 and a connecting pipe 33, wherein the water inlet tank 28 is connected with the water inlet pipeline of the booster pump 27, a water outlet of the booster pump 27 is connected with the high-pressure water storage tank 26 through a pipeline, and a water outlet of the high-pressure water storage tank 26 is connected with a water inlet of the sensor 24 through the connecting pipe 33.
The sensor 24 is provided with a time control unit and a water flow control unit, and can accurately measure the water flow in unit time at each moment.
The pressure barrel 13 comprises a barrel body with two open ends, a pressure plate 20, a first cover plate 10 and a second cover plate 14, wherein the first cover plate 10 is provided with a first water inlet 1, a first exhaust and water release valve 2, a confining pressure water inlet 3 and a confining pressure exhaust and water release valve 4, and the second cover plate 14 is provided with a second water inlet 11 and a second exhaust and water release valve 12; the second cover plate 14 is connected with one end of the barrel body through welding; the first cover plate 10 covers the other end of the barrel body, and the first cover plate 10 and the second cover plate 14 are fixedly connected in a sealing way through a first bolt 21 with a first nut 7; the pressure plate 20 is fixedly connected with the inner surface of the first cover plate 10 through a second bolt 22 with a second nut 18, a test piece 23 is clamped between the pressure plate 20 and the first cover plate 10, and the contact part of the test piece 23 with the pressure plate 20 and the first cover plate 10 is kept sealed; sealing rings are clamped between the pressure plate 20 and the test piece 23 and between the first cover plate 10 and the test piece 23.
The inner surface of the first cover plate 10 is provided with two circles of annular grooves;
two rings of annular grooves arranged on the inner surface of the first cover plate 10 are respectively provided with a first rubber ring 9 and a second rubber ring 8.
A ring of annular groove is arranged on the surface of one side of the pressure plate 20;
and a ring of annular grooves arranged on the surface of one side of the pressure plate 20 are provided with a third rubber ring 19.
The distance between the pressure plate 20 and the first cover plate 10 is 0-95 mm, and the distance between the pressure plate 20 and the first cover plate 10 is adjusted through a second bolt 22; the height of the test piece 23 is adjusted randomly between 0mm and 95 mm; the sealing rings are all processed by high-toughness silica gel; the test water pressure range in the pressure barrel 13 is 0-5 MPa.
The following concrete description of the working process of the present invention is made by taking the measurement of the water cement ratio of 0.5, the aggregate volume content of 71.4%, the saturation of 80%, the maintenance age of 28d, the height of 50mm, and the permeability coefficient measurement of a concrete sample with the diameter of 100mm under the confining pressure of 0.3MPa and the pressure difference of 0.5MPa as an example:
before the test is started, the size is set to
After the test piece is subjected to standard maintenance for 28 days, taking out the test piece from a maintenance room, cutting the end part of the test piece by 50mm respectively by using a cutting machine, carrying out vacuum water saturation for 24 hours, and weighing to obtain water saturation mass m1Then taking out the dried powder from the vacuum water saturation machine, putting the dried powder into an oven for drying, taking out and weighing to obtain the dried powder with the drying mass m2. Continuing to saturate in vacuum for 24h, then putting the mixture into an oven, and weighing every 1h until the weight m is m2+0.8×m1-m2。
The concrete test piece is immediately sealed after reaching the target saturation, and is placed in a constant temperature and humidity laboratory at the temperature and humidity of 20 ℃/RH 50% for 3 months after being sealed so as to achieve balance of the temperature and the humidity inside and outside the test piece, reduce test errors and approach to the real situation. And finally, sealing the side wall of the test piece by using epoxy resin.
According to the test requirement, as shown in fig. 7, a test piece 23 is placed between the first cover plate 10 and the pressure plate 20, the upper surface and the lower surface of the test piece 23 are respectively contacted with the second rubber ring 8 and the third rubber ring 19, and the second bolt 22 and the second nut 18 are screwed, so that the test piece 23 achieves a good sealing effect. After the test piece is sealed, as shown in fig. 7, the two holes on the pressure plate 20 are connected to the second exhaust/drain valve 12 and the second water inlet 11 on the second cover plate through stainless steel connecting pipes 31 and 32, respectively. As shown in fig. 8, the sealed first cover plate 10 with the test piece 23 and the pressure barrel 13 connected with the second cover plate 14 by welding are embedded, and the first bolt 21 and the first nut 7 are screwed, so that the first cover plate 10 and the pressure barrel 13 achieve a good sealing effect.
After the test barrel body is installed, water is injected into the test barrel body through the confining pressure water inlet 3 until the confining pressure exhaust water escape valve 4 overflows, water injection is stopped, and the confining pressure exhaust water escape valve 4 is closed; and when water is injected into the test barrel body to the first exhaust and water drain valve 2 and the second exhaust and water drain valve 12 through the first water inlet 1 and the second water inlet 11 and water overflows, stopping injecting water and closing the first exhaust and water drain valve 2 and the second exhaust and water drain valve 12.
And (3) bidirectional isobaric application: setting a confining pressure parameter of 0.3MPa, a pressure parameter of 0.5MPa of the first water inlet 1 and a pressure parameter of 0.5MPa of the second water inlet 11 in control panels connected with the confining pressure water inlet 3, the first water inlet 1 and the second water inlet 11 respectively, then starting a program, starting a booster pump 27, recording total flow in unit time after the increasing rate of flow reading on the sensor 24 is stable, and averaging the obtained result to be the flow Q caused by capillary actioncap。
Unidirectional pressure application: setting a pressure parameter 0.5MPa of the first water inlet 1 and a pressure parameter 0MPa of the second water inlet 11 in a controller panel, starting a program, starting a booster pump 27, recording the flow in unit time after the increase rate of the flow reading on the sensor 24 is stable, and taking an average value of the obtained results, namely the water seepage flow Q caused by the pressure action and the capillary action;
effective water penetration amount Q per unit timeperNamely: qper＝Q-Qcap*0.5；
According to Darcy's law, the permeability coefficient K is calculated by the formula:
wherein mu is fluid viscosity and unit Pa.s; qperIs the effective water penetration per unit time, in cm3L is the thickness of the test piece in cm, A is the cross section area of the test piece in cm2△ p is the pressure difference under unidirectional applied pressure, in Pa;
after the test is finished, the booster pump 27 is firstly closed, and after the pressure in the barrel body is completely unloaded, the confining pressure exhaust water drain valve 4 is opened, the first exhaust water drain valve 2 and the second exhaust water drain valve 12 drain the water of the test barrel body, and the test piece 23 is taken down.
When specifically implementing, the utility model discloses do not restrict specific device model, as long as can accomplish the components and parts of above-mentioned function all can.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention includes equivalent technical means that can be conceived by those skilled in the art based on the inventive concepts.
Claims (7)
1. The device is characterized by comprising a test barrel body, a water injection pressurizing unit, a sensor and a controller with a control panel, wherein a test piece is arranged in the test barrel body, a confining pressure water inlet of the test barrel body is connected with the water injection pressurizing unit, a first water inlet and a second water inlet of the test barrel body are connected with the sensor, and the sensor is connected with the water injection pressurizing unit; the controller comprises a time control unit and a pressure control unit, wherein a signal input end of the pressure control unit is connected with a pressure sensor arranged in the test barrel, a signal output end of the controller is connected with a control end of a booster pump of the water injection booster unit, and a signal input and output end of the time control unit and a signal input and output end of the pressure control unit are connected with a control end of the control panel.
2. The test device as claimed in claim 1, wherein the test barrel body comprises a pressure barrel with cover plates at two ends and a pressure plate arranged in the pressure barrel, and the cover plates are provided with a water inlet and an exhaust drain valve for communicating with the sensor; the center of the pressure plate is provided with a through hole, the pressure plate is fixedly connected with one cover plate, and the test piece is clamped between the pressure plate and the cover plate.
3. The test device as claimed in claim 1 or 2, wherein the water injection pressurizing unit comprises a water inlet pipe communicated with an external water source, a water inlet tank, a pressurizing pump, a high-pressure water storage tank and a connecting pipe, the water inlet tank is connected with a water inlet pipeline of the pressurizing pump, a water outlet of the pressurizing pump is connected with the high-pressure water storage tank, and a water outlet of the high-pressure water storage tank is connected with a water inlet of the sensor through the connecting pipe.
4. The test device according to claim 2, wherein the pressure barrel comprises a barrel body with two open ends, a pressure plate, a first cover plate and a second cover plate, the first cover plate is provided with a first water inlet and a first exhaust water drain valve, a confining pressure water inlet and a confining pressure exhaust water drain valve, and the second cover plate is provided with a second water inlet and a second exhaust water drain valve; the second cover plate is connected with one end of the barrel body through welding; the first cover plate is covered on the other end of the barrel body, and the first cover plate and the second cover plate are fixedly connected in a sealing mode through a first bolt with a first nut; the pressure plate is fixedly connected with the inner surface of the first cover plate through a second bolt with a second nut, a test piece is clamped between the pressure plate and the first cover plate, and the contact part of the test piece, the pressure plate and the first cover plate is kept sealed; the pressure disk with the test piece between, first apron with the test piece between all accompany the sealing washer.
5. The testing apparatus as claimed in claim 4, wherein the inner surface of the first cover plate is provided with two rings of annular grooves, and the two rings of annular grooves provided on the inner surface of the first cover plate are respectively provided with a first rubber ring and a second rubber ring.
6. The testing apparatus according to claim 4, wherein the platen-side surface is provided with a ring-shaped groove, and the ring-shaped groove provided on the platen-side surface is provided with a third rubber ring.
7. The testing apparatus as claimed in claim 4, wherein the distance between the pressure plate and the first cover plate is 0-95 mm, and the distance between the pressure plate and the first cover plate is adjusted by a second bolt; the height of the test piece is adjusted randomly between 0mm and 95 mm; the sealing rubber rings are all processed by high-toughness silica gel; the test water pressure range in the pressure barrel is 0-5 MPa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110542636A (en) * | 2019-09-26 | 2019-12-06 | 浙江工业大学 | Method for measuring permeability coefficient of partially saturated cement-based material and test device thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542636A (en) * | 2019-09-26 | 2019-12-06 | 浙江工业大学 | Method for measuring permeability coefficient of partially saturated cement-based material and test device thereof |
| CN110542636B (en) * | 2019-09-26 | 2024-04-16 | 浙江工业大学 | Method for measuring permeability coefficient of partially saturated cement-based material and test device thereof |
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