CN114739888A - Permeation test device and method for pervious concrete in various shapes - Google Patents
Permeation test device and method for pervious concrete in various shapes Download PDFInfo
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- CN114739888A CN114739888A CN202210457865.5A CN202210457865A CN114739888A CN 114739888 A CN114739888 A CN 114739888A CN 202210457865 A CN202210457865 A CN 202210457865A CN 114739888 A CN114739888 A CN 114739888A
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- 238000012360 testing method Methods 0.000 title claims abstract description 119
- 239000011380 pervious concrete Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 165
- 238000007789 sealing Methods 0.000 claims abstract description 44
- 230000035515 penetration Effects 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 239000004567 concrete Substances 0.000 claims abstract description 14
- 238000010998 test method Methods 0.000 claims abstract description 5
- 230000035699 permeability Effects 0.000 claims description 39
- 239000007788 liquid Substances 0.000 claims description 25
- 239000003822 epoxy resin Substances 0.000 claims description 12
- 229920000647 polyepoxide Polymers 0.000 claims description 12
- 239000012466 permeate Substances 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 4
- 230000008595 infiltration Effects 0.000 claims 2
- 238000001764 infiltration Methods 0.000 claims 2
- 230000008569 process Effects 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A penetration test device and method for pervious concrete with various shapes belong to the technical field of concrete testing. The penetration test device for the pervious concrete with various shapes comprises an overflow water tank provided with a plurality of overflow ports, a measuring cylinder arranged in the overflow water tank and communicated with the overflow water tank, and a water inlet pipe used for injecting water into the measuring cylinder, wherein a base plate with a water-permeable hole is fixedly arranged in the measuring cylinder and used for placing a test piece wrapped with an annular inflatable rubber sealing ring, the measuring cylinder is communicated with a communicating pipe outside the measuring cylinder, and the side wall of the measuring cylinder and the communicating pipe are provided with scales; the penetration test method for the pervious concrete with various shapes is used for calculating the actual penetration coefficient of the pervious concrete test piece. The penetration test device and the method for the pervious concrete with various shapes can be used for performing penetration tests on the pervious concrete with various shapes, simplify the field measurement steps, improve the measurement precision and improve the convenience of actual measurement.
Description
Technical Field
The invention relates to the technical field of concrete testing, in particular to a penetration test device and method for pervious concrete with various shapes.
Background
The pervious concrete has larger gaps, compared with the traditional concrete, has the characteristics of supplementing underground water, quickly permeating water, adjusting urban climate and earth surface temperature, beautifying, improving earth surface plants and the like, and has important significance for recycling urban resources and reducing carbon emission. With the construction of sponge cities advocated by the nation, the engineering demand of pervious concrete is increasing, especially on roads, residential roads, parking lots and the like.
The water permeability of the pervious concrete is an important parameter for evaluating the performance of the pervious concrete, but the operation steps of measuring equipment in field measurement are more and more complicated, and the problem of low precision caused by water leakage of a side hole of a test piece in the measurement process is urgently needed to be solved. Moreover, the problems that the water flow of inlet water and outlet water cannot be accurately read, the position of an overflow gap is single, the error is large in the measuring process, the shapes of the to-be-tested pieces are various and the like exist in the existing measuring process of the pervious concrete.
Disclosure of Invention
In order to solve the technical problems in the existing permeable concrete field measurement permeability process, the invention provides a permeability test device and method for permeable concrete with various shapes, which can perform permeability tests on permeable concrete with various shapes, determine relevant parameters for calculating the permeability coefficient of the permeable concrete, facilitate operation, simplify field measurement steps, improve measurement accuracy and improve convenience of actual measurement.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a penetration test device for pervious concrete of various shapes, comprising:
the overflow water tank is provided with a plurality of overflow ports;
the measuring cylinder is arranged inside the overflow water tank and is communicated with the overflow water tank; a base plate with water permeable holes is fixedly arranged in the measuring cylinder and used for placing a test piece wrapped with an annular inflatable rubber sealing ring; the measuring cylinder is communicated with a communicating pipe outside the measuring cylinder, and the side wall of the measuring cylinder and the communicating pipe are provided with scales; and
and the water inlet pipe is used for injecting water into the measuring cylinder.
Furthermore, epoxy is paintd to the test piece lateral wall for with annular inflatable rubber seal sealing connection, annular inflatable rubber seal is provided with the inflation inlet, is used for aerifing to annular inflatable rubber seal inside.
Furthermore, each overflow port is provided with a valve and communicated with the flow guide pipe, and the water outlet end of the flow guide pipe is provided with a recovery water tank.
Furthermore, the water inlet pipe is provided with a first flow meter and a first valve, and the flow guide pipe is provided with a second flow meter.
Furthermore, the overflow water tank is provided with three overflow ports, namely an upper overflow port, a middle overflow port and a lower overflow port, the upper overflow port is higher than the top of the test piece, the middle overflow port is as high as the middle of the test piece, and the lower overflow port is lower than the bottom of the test piece.
Furthermore, the positions of 0 points of the scales on the side wall of the measuring cylinder and the communicating pipe are both positioned on the bottom surface of the inner side of the overflow water tank.
Further, an overflow pipe is arranged on the side of the measuring cylinder.
Furthermore, a plurality of drain holes are formed below the side wall of the measuring cylinder and are used for being communicated with an overflow water tank.
Furthermore, a thermometer is arranged in the overflow water tank and used for reading the water temperature in the overflow water tank.
Preferably, a water permeable cushion block is arranged inside the measuring cylinder and used for placing the cushion plate.
The penetration test method for the pervious concrete in various shapes comprises the following steps:
s1, smearing epoxy resin on the side face of the test piece, and wrapping the annular inflatable rubber sealing ring outside the side face of the test piece after the epoxy resin is cured;
s2, placing the test piece wrapped by the annular inflatable rubber sealing ring above a base plate in the measuring cylinder, and inflating the annular inflatable rubber sealing ring through an inflation inlet to fix the test piece and enable the test piece, the annular inflatable rubber sealing ring and the measuring cylinder to be tightly attached;
s3, opening a valve I of the water inlet pipe and opening a valve of an overflow port of the overflow water tank;
s4, water of the water inlet pipe flows into the measuring cylinder, permeates into the overflow water tank through the pervious concrete test piece and flows out of an overflow port of the overflow water tank opening valve;
reading the readings Q of the first flowmeter and the second flowmeter after the readings of the first flowmeter and the second flowmeter are equal and kept for 30 seconds;
reading the height h of the liquid level in the communicating tube1And the height h of the liquid level in the overflow water tank2Calculating the level difference H ═ H1-h2；
Reading the water temperature T in the overflow water tank displayed by the thermometer;
by calculation of the permeability coefficient
Calculating a permeability coefficient;
in the formula, κTThe permeability coefficient of the test piece at the water temperature of T ℃ is mm/s;
q is the amount of permeated water in 1 second, mm3/s；
L is the height of the test piece, mm;
a is the cross-sectional area of the specimen, mm2；
H is the liquid level difference of water, mm;
s5, closing the opened overflow port valve, sequentially opening the valves of other overflow ports of the overflow water tank, only opening the valve of one overflow port each time, and repeating the step S4 to obtain the permeability coefficient of the overflow water tank under the condition that each overflow port valve is independently opened; calculating the average value of all permeability coefficients to obtain the actual permeability coefficient of the pervious concrete test piece;
and S6, opening the inflation inlet after the measurement is finished, and taking out the test piece after the annular inflatable rubber sealing ring exhausts air.
Compared with the prior art, the invention has the beneficial effects that:
1) the device has simple structure and convenient operation, and measures the relevant parameters for calculating the permeability coefficient of the pervious concrete.
2) The water inlet flow and the water outlet flow are accurately measured by the first flowmeter and the second flowmeter, the liquid level height in the measuring cylinder is quickly read by the scales of the communicating pipe, and the test efficiency is improved.
3) The measuring cylinder is of an integral cylinder structure, the problem of leakage caused by the joint of multiple parts is effectively solved, the problem of seam leakage is solved, the sealing between the measuring cylinder and a test piece is realized through the annular inflatable rubber sealing ring, and the sealing performance of the device is improved.
4) According to the invention, the height of the overflow gap and the height of the liquid level at the upper part of the test piece are adjusted, and the method for carrying out multiple experiments to obtain the average value enables the test data to be more accurate.
5) The invention can be used for permeable concrete test pieces with various shapes such as cylindrical, square and three-dimensional shapes.
Additional features and advantages of the invention will be set forth in part in the detailed description which follows.
Drawings
FIG. 1 is a schematic structural diagram of a penetration test apparatus for permeable concrete of various shapes according to an embodiment of the present invention;
FIG. 2 is a top view of a cylindrical test piece wrapped by an annular pneumatic rubber sealing ring according to an embodiment of the present invention;
FIG. 3 is a top view of a cubic test piece wrapped by an annular pneumatic rubber sealing ring according to an embodiment of the present invention.
Reference numerals in the drawings of the specification include:
1-water inlet pipe, 2-flowmeter I, 3-measuring cylinder, 4-upper overflow port, 5-middle overflow port, 6-lower overflow port, 7-overflow pipe, 8-permeable cushion block, 9-backing plate, 10-drain hole, 11-annular inflatable rubber sealing ring, 12-inflation port, 13-overflow water tank, 14-valve I, 15-draft tube, 16-flowmeter II, 17-test piece, 18-valve II, 19-valve III, 20-valve IV.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations. The terms "a" and "an" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In order to solve the problems of the prior art, as shown in fig. 1 to 3, the present invention provides a penetration test apparatus for pervious concrete of various shapes, comprising:
an overflow water tank 13 provided with a plurality of overflow ports;
a measuring cylinder 3 which is arranged inside the overflow water tank 13 and communicated with the overflow water tank 13; a backing plate 9 with water permeable holes is fixedly arranged in the measuring cylinder 3 and used for placing a test piece 17 wrapped with an annular inflatable rubber sealing ring 11; the measuring cylinder 3 is communicated with a communicating pipe outside the measuring cylinder, and the side wall of the measuring cylinder 3 and the communicating pipe are provided with scales; and
a water inlet pipe 1 for injecting water into the measuring cylinder 3.
Epoxy resin is smeared on the side wall of the test piece 17 and is used for being in sealing connection with the annular inflatable rubber sealing ring 11, and the annular inflatable rubber sealing ring 11 is provided with an inflation inlet 12 for inflating the interior of the annular inflatable rubber sealing ring 11.
In the invention, the annular inflatable rubber sealing ring 11 is a device for fixing the to-be-tested piece 17 and preventing the side surface of the to-be-tested piece 17 from permeating water, before measurement, the side surface of the to-be-tested piece 17 is coated with epoxy resin and is arranged in the annular inflatable rubber sealing ring 11, the annular inflatable rubber sealing ring 11 is inflated through the inflation inlet 12, so that the to-be-tested piece 17 is tightly attached to the measuring cylinder 3 to form a closed whole, the upper surface and the lower surface of the to-be-tested piece 17 are not shielded by the annular inflatable rubber sealing ring 11 during inflation, the deformation and the fitting performance of the annular inflatable rubber sealing ring 11 are good, so that the measurement of test pieces 17 with various sizes can be realized, the water is effectively prevented from flowing out from the side surface of the test piece 17 to be measured to influence the accuracy of the measurement coefficient, the test piece 17 is replaced by deflating the inflation inlet 12 after the measurement to realize the rapid measurement, the annular inflatable rubber sealing ring 11 used in the invention can be repeatedly used, and the cost is saved.
As shown in fig. 2 and 3, the penetration test apparatus of the present invention is sealed by the annular pneumatic rubber seal ring 11, so that the penetration test apparatus is suitable for various shapes of permeable concrete test pieces 17, for example, the test piece 17 is a cylindrical permeable concrete test piece 17 or a cubic permeable concrete test piece 17, and the size of the test piece 17 is 150mm by 150mm, 100mm by 100mm, or 70.5mm by 70.5mm when the test piece 17 is a cube; the dimensions of the test piece 17 when it is a cylinder are: the diameter is 100mm, the height is 50mm, and the test piece 17 inflated through the annular inflatable rubber sealing ring 11 and coated with epoxy resin is tightly attached to the measuring cylinder 3, so that the influence on data accuracy caused by water leaking from the side surface of the test piece 17 in the testing process is prevented.
In the invention, the water inlet pipe 1 is arranged above the measuring cylinder 3, the overflow water tank 13, the recovery water tank, the communicating pipe, the overflow pipe 7 and the flow guide pipe 15 all adopt transparent organic glass, and the inner diameter of the measuring cylinder 3 is consistent in size.
In the invention, each overflow port is provided with a valve and is communicated with a flow guide pipe 15, and the water outlet end of the flow guide pipe 15 is provided with a recovery water tank. The water inlet pipe 1 is provided with a first flowmeter 2 and a first valve 14, the flow guide pipe 15 is provided with a second flowmeter 16, in the embodiment, the inner diameters of the water inlet pipe 1 and the flow guide pipe 15 are the same, and the water inlet amount and the water outlet amount are controlled by arranging the first valve 14, the second valve 18, the third valve 19 and the fourth valve 20. In order to accurately measure the flow rate and the flow velocity of water, a first flow meter 2 is arranged at the end part of a water inlet pipe 1, a second flow meter 16 is arranged at the end part of a guide pipe 15, the numerical values of the first flow meter 2 and the second flow meter 16 represent the instantaneous water flow, the sizes of the inflow water quantity and the outflow water quantity are respectively measured through the first flow meter 2 and the second flow meter 16, in the measuring process, after the readings of the first flow meter 2 and the second flow meter 16 are consistent and continuously kept for 30s, the flow reading Q is recorded, and then the liquid level heights in a measuring cylinder 3 and an overflow water tank 13 are started to be read, so that the liquid level height difference H is obtained.
The overflow water tank 13 is provided with three overflow ports, namely an upper overflow port 4, a middle overflow port 5 and a lower overflow port 6, the height of the upper overflow port 4 is higher than the top of the test piece 17, the height of the middle overflow port 5 is equal to the height of the middle of the test piece 17, and the height of the lower overflow port 6 is lower than the bottom of the test piece 17.
The position of 0 point of the scales on the side wall of the measuring cylinder 3 and the communicating pipe is located on the inner bottom surface of the overflow water tank 13, in order to adjust pressure difference and measure pressure difference height, two lines of scales are arranged on the side wall of the measuring cylinder 3, the communicating pipe with the scales is arranged on the upper portion of the outer wall of the measuring cylinder 3, the two lines of scales on the side wall of the measuring cylinder 3 are symmetrically arranged on two sides of the communicating pipe, the minimum scale unit is 0.5mm, the scales of the communicating pipe are convenient to read the liquid level height in the measuring cylinder 3, the scales of the measuring cylinder 3 are convenient to read the liquid level height in the overflow water tank 13, and the liquid level height difference can be accurately calculated by measuring the liquid level heights in the measuring cylinder 3 and the overflow water tank 13.
The lateral part of the measuring cylinder 3 is provided with an overflow pipe 7, specifically, the overflow pipe 7 is arranged on the upper part of the lateral surface of the measuring cylinder 3 to prevent the water pressure from being overlarge, and the overflow pipe 7 is connected with an outer pipeline to discharge overflowed water.
A plurality of drain holes 10 are arranged below the side wall of the measuring cylinder 3 and are used for being communicated with an overflow water tank 13, so that water in the measuring cylinder 3 flows into the overflow water tank 13.
A thermometer is arranged in the overflow water tank 13 and used for reading the temperature of water in the overflow water tank 13.
As a preferred embodiment, the inside of the measuring cylinder 3 is provided with a water permeable cushion 8 for placing a pad 9, and of course, the pad 9 with water permeable holes may also be fixed inside the measuring cylinder 3 by other methods, such as welding.
The invention also provides a penetration test method for the pervious concrete with various shapes, which comprises the following steps:
s1, after the pervious concrete test piece 17 is dried, coating epoxy resin on the side surface of the test piece 17, and after the epoxy resin is cured, wrapping the annular inflatable rubber sealing ring 11 outside the side surface of the test piece 17;
s2, placing the test piece 17 wrapped by the annular inflatable rubber sealing ring 11 above the backing plate 9 in the measuring cylinder 3, and inflating the annular inflatable rubber sealing ring 11 through the inflation inlet 12 to fix the test piece 17 and enable the test piece 17, the annular inflatable rubber sealing ring 11 and the measuring cylinder 3 to be tightly attached;
s3, opening a valve I14 of the water inlet pipe 1 and opening a valve of an overflow port of the overflow water tank 13;
in this embodiment, after the first valve 14 is opened, when water flows into the measuring cylinder 3, the first valve 14 is needed to control the amount of water to prevent the water pressure from being too high, the water flows into the overflow water tank 13 through the to-be-tested piece 17, only one overflow port is opened in the overflow water tank 13 during each test, the corresponding overflow port is closed according to the height of the overflow water tank 13, for example, the valve of the upper overflow port 4 is selected to be opened, and the valves of the middle overflow port 5 and the lower overflow port 6 are closed; when water flows out from the overflow port of the selected overflow water tank 13, adjusting the water quantity through an adjusting valve I14;
s4, water in the water inlet pipe 1 flows into the measuring cylinder 3, permeates into the overflow water tank 13 through the pervious concrete test piece 17 and flows out from the overflow water tank 13 through an overflow port of an open valve;
reading the readings Q of the first flowmeter 2 and the second flowmeter 16 after the readings of the first flowmeter 2 and the second flowmeter 16 are equal and kept for 30 seconds;
reading the height h of the liquid level in the communicating tube1And the liquid level h in the overflow tank 132Calculating the level difference H ═ H1-h2；
Reading the water temperature T in the overflow water tank 13 displayed by the thermometer;
by calculation of the permeability coefficient
Calculating a permeability coefficient;
in the formula，κTThe permeability coefficient of the test piece 17 at the water temperature T ℃ is mm/s;
q is the amount of permeated water in 1 second, mm3/s；
L is the height, mm, of the test piece 17;
a is the cross-sectional area of the specimen 17, mm2；
H is the liquid level difference of water, mm;
s5, closing the opened overflow port valves, sequentially opening valves of other overflow ports of the overflow tank 13, opening only one valve of the overflow ports each time, and repeating the step S4 to obtain the permeability coefficient of the overflow tank 13 under the condition that each valve of the overflow port is independently opened; calculating the average value of all permeability coefficients to obtain the actual permeability coefficient of the pervious concrete test piece 17;
and S6, after the measurement is finished, opening the inflation inlet 12, and taking out the test piece 17 after the annular inflatable rubber sealing ring 11 exhausts air.
Examples
The embodiment provides a penetration test method for pervious concrete in various shapes, which comprises the following steps:
s1, drying the pervious concrete test piece 17, taking out the pervious concrete test piece 17, coating epoxy resin on the side surface, curing the epoxy resin, wrapping the annular inflatable rubber sealing ring 11 outside the side surface of the test piece 17 to ensure that the test piece 17 is watertight, and water can only permeate from the upper surface to the lower surface of the test piece 17;
s2, placing the test piece 17 wrapping the annular inflatable rubber seal ring 11 above the backing plate 9 in the measuring cylinder 3, and inflating the annular inflatable rubber seal ring 11 through the inflation inlet 12 to fix the test piece 17 and enable the test piece 17, the annular inflatable rubber seal ring 11 and the measuring cylinder 3 to be tightly attached;
s3, opening a first valve 14 of the water inlet pipe 1, and opening a valve of an overflow port 6 at the lower part of the overflow water tank 13, wherein the valves of the upper overflow port 4 and the middle overflow port 5 are in a closed state;
s4, water in the water inlet pipe 1 flows into the measuring cylinder 3, and the water flows into the overflow water tank 13 through the test piece 17 to be tested and flows out from the overflow port 6 at the lower part of the overflow water tank 13;
reading the readings Q of the first flowmeter 2 and the second flowmeter 16 after the readings of the first flowmeter 2 and the second flowmeter 16 are equal and kept for 30 seconds;
reading the height h of the liquid level in the communicating tube1And the height h of the liquid level in the overflow water tank 132Calculating the level difference H ═ H1-h2；
Reading the water temperature T in the overflow water tank 13 displayed by the thermometer;
by calculation of formula of permeability coefficient
Calculating a permeability coefficient;
in the formula, κTThe permeability coefficient of the test piece 17 at the water temperature T ℃ is mm/s;
q is the amount of permeated water in 1 second, mm3The flow meter 2 and the flow meter 16 are indicated in the second time;
l is the height, mm, of the test piece 17;
a is the cross-sectional area of the specimen 17, mm2；
H is the liquid level difference of water, mm;
in this embodiment, the height h of the liquid level in the communication pipe1Namely, the height of the liquid level in the measuring cylinder 3 is measured, the liquid level difference H is accurate to 0.5mm, the temperature T of the water in the overflow water tank 13 is accurate to 0.5 ℃, and the permeability coefficient under the overflow height of the lower overflow port 6 is obtained;
s5, closing the valve of the overflow port 6 at the lower part of the overflow trough 13, opening the valve of the overflow port 5 at the middle part of the overflow trough 13, and repeating the step S4 to obtain the permeability coefficient of the overflow port 5 at the middle part in the overflow height at the moment when the overflow port 4 at the upper part is also in a closed state;
then, closing the valve of the overflow port 5 in the middle of the overflow trough 13, opening the valve of the overflow port 4 on the upper part of the overflow trough 13, and repeating the step S4 to obtain the permeability coefficient of the overflow port 4 at the overflow height;
after the test is finished, calculating the average value of the permeability coefficient under the overflow height of the lower overflow port 6, the permeability coefficient under the overflow height of the middle overflow port 5 and the permeability coefficient under the overflow height of the upper overflow port 4 to obtain the actual permeability coefficient of the pervious concrete test piece 17, and improving the accuracy of permeability coefficient measurement;
and S6, after the measurement is finished, opening the inflation inlet 12, taking out the test piece 17 after the annular inflatable rubber sealing ring 11 exhausts air, and after the test, cleaning the water in the overflow water tank 13, wiping the equipment, finishing and storing for later use.
The invention relates to a penetration test device and a method for pervious concrete with various shapes, which have the working principle that:
during measurement, a test piece 17 is placed in the center of the perforated base plate 9 in the measuring cylinder 3, and the annular inflatable rubber sealing ring 11 is inflated until the test piece 17 cannot move;
water is delivered from the upper side of the measuring cylinder 3, the water flow and the water inflow are monitored through the first flowmeter 2, the water flows to the overflow water tank 13 through the measuring cylinder 3 and then flows out of the penetration test device through the overflow port, the second flowmeter 16 is arranged at the overflow port to monitor the water outflow, and when the instantaneous water inflow and the water outflow are equal and continue for 30s, the penetration coefficient of the test piece 17 is read and calculated;
in order to measure the influence on the permeability coefficient when the pressure difference changes, the overflow water tank 13 is provided with three overflow ports (namely an upper overflow port 4, a middle overflow port 5 and a lower overflow port 6) with different heights, the overflow height is adjusted through the opening and closing of a valve, and the measurement precision is improved;
in order to facilitate the observation of the liquid level of the measuring cylinder 3, a communicating pipe with scales is led out from the upper part of the measuring cylinder 3 and is used for reading the actual liquid level height in the measuring cylinder 3 during the measurement;
in order to ensure that the inflow water quantity is equal to the overflow water quantity, the pipe diameter of the water inlet pipe 1 is equal to that of the flow guide pipe 15;
the utility model provides a rubber seal 11 can be aerifyd to annular is sealed, has optimized the concrete that permeates water and has realized the measurement of different shapes test piece 17 permeability moreover because of the uneven influence problem to the osmotic coefficient of detecting component lateral wall pore distribution, realizes installing fast and dismantles test piece 17 in the measurement, improves suitability and survey efficiency.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A penetration test device for pervious concrete of various shapes, comprising:
the overflow water tank is provided with a plurality of overflow ports;
the measuring cylinder is arranged inside the overflow water tank and communicated with the overflow water tank; a base plate with water permeable holes is fixedly arranged in the measuring cylinder and used for placing a test piece wrapped with an annular inflatable rubber sealing ring; the measuring cylinder is communicated with a communicating pipe outside the measuring cylinder, and the side wall of the measuring cylinder and the communicating pipe are provided with scales; and
and the water inlet pipe is used for injecting water into the measuring cylinder.
2. The penetration test device for the pervious concrete in various shapes according to claim 1, wherein the side wall of the test piece is coated with epoxy resin for being in sealing connection with the annular inflatable rubber sealing ring, and the annular inflatable rubber sealing ring is provided with an inflation inlet for inflating the interior of the annular inflatable rubber sealing ring.
3. The infiltration test device for pervious concrete of various shapes according to claim 1, wherein each overflow port is provided with a valve and is communicated with a flow guide pipe, and the water outlet end of the flow guide pipe is provided with a recovery water tank.
4. The permeability test device for the pervious concrete in various shapes according to claim 3, wherein the water inlet pipe is provided with a first flow meter and a first valve, and the flow guide pipe is provided with a second flow meter.
5. The infiltration test device for pervious concrete of various shapes according to claim 1, wherein the overflow water tank is provided with three overflow ports, namely an upper overflow port, a middle overflow port and a lower overflow port, the upper overflow port is higher than the top of the test piece, the middle overflow port is as high as the middle of the test piece, and the lower overflow port is lower than the bottom of the test piece.
6. The penetration test device for pervious concrete in various shapes according to claim 1, wherein the 0 point position of the scales on the side wall of the measuring cylinder and the communicating pipe are both positioned on the inner bottom surface of the overflow water tank.
7. The penetration test apparatus for various shapes of pervious concrete according to claim 1, wherein the measuring cylinder is provided with an overflow pipe at its side.
8. The permeability test device for pervious concrete of various shapes according to claim 1, wherein a plurality of drainage holes are arranged below the side wall of the measuring cylinder and are used for communicating with an overflow water tank.
9. The penetration test apparatus for permeable concrete with various shapes according to claim 1, wherein a thermometer is arranged in the overflow water tank for reading the temperature of water in the overflow water tank.
10. A penetration test method for pervious concrete of various shapes by using the penetration test apparatus for pervious concrete of various shapes according to claim 1, comprising the steps of:
s1, smearing epoxy resin on the side face of the test piece, and wrapping the annular inflatable rubber sealing ring outside the side face of the test piece after the epoxy resin is cured;
s2, placing the test piece wrapped by the annular inflatable rubber sealing ring above a base plate in the measuring cylinder, and inflating the annular inflatable rubber sealing ring through an inflation inlet to fix the test piece and enable the test piece, the annular inflatable rubber sealing ring and the measuring cylinder to be tightly attached;
s3, opening a valve I of the water inlet pipe and opening a valve of an overflow port of the overflow water tank;
s4, water of the water inlet pipe flows into the measuring cylinder, permeates into the overflow water tank through the pervious concrete test piece and flows out of an overflow port of the overflow water tank opening valve;
reading the readings Q of the first flowmeter and the second flowmeter after the readings of the first flowmeter and the second flowmeter are equal and kept for 30 seconds;
reading the height h of the liquid level in the communicating tube1And the height h of the liquid level in the overflow water tank2Calculating the level difference H ═ H1-h2；
Reading the water temperature T in the overflow water tank displayed by the thermometer;
by calculation of formula of permeability coefficient
Calculating a permeability coefficient;
in the formula, κTThe permeability coefficient of the test piece at the water temperature of T ℃ is mm/s;
q is the amount of permeated water in 1 second, mm3/s；
L is the height of the test piece, mm;
a is the cross-sectional area of the specimen, mm2；
H is the liquid level difference of water, mm;
s5, closing the opened overflow port valve, sequentially opening the valves of other overflow ports of the overflow water tank, only opening the valve of one overflow port each time, and repeating the step S4 to obtain the permeability coefficient of the overflow water tank under the condition that each overflow port valve is independently opened; calculating the average value of all permeability coefficients to obtain the actual permeability coefficient of the pervious concrete test piece;
and S6, opening the inflation inlet after the measurement is finished, and taking out the test piece after the annular inflatable rubber sealing ring exhausts air.
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| CN117907194B (en) * | 2024-03-15 | 2024-05-14 | 兴化市建设工程质量检测有限公司 | Concrete water permeability detection device |
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