CN112067491A - Test device and method for quantitatively measuring blockage state of pervious concrete pavement - Google Patents
Test device and method for quantitatively measuring blockage state of pervious concrete pavement Download PDFInfo
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- CN112067491A CN112067491A CN202010797778.5A CN202010797778A CN112067491A CN 112067491 A CN112067491 A CN 112067491A CN 202010797778 A CN202010797778 A CN 202010797778A CN 112067491 A CN112067491 A CN 112067491A
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- 239000011380 pervious concrete Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000004567 concrete Substances 0.000 claims abstract description 85
- 230000008595 infiltration Effects 0.000 claims abstract description 27
- 238000001764 infiltration Methods 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 21
- 238000010411 cooking Methods 0.000 claims abstract description 18
- 238000005303 weighing Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000011148 porous material Substances 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 10
- 238000009835 boiling Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract 3
- 239000002245 particle Substances 0.000 description 11
- 230000035699 permeability Effects 0.000 description 9
- 239000012615 aggregate Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036619 pore blockages Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction 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
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
-
- 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
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
- G01N15/0893—Investigating volume, surface area, size or distribution of pores; Porosimetry by measuring weight or volume of sorbed fluid, e.g. B.E.T. method
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Road Paving Structures (AREA)
Abstract
The invention discloses a test device and a method for quantitatively measuring the blockage state of a pervious concrete pavement, belonging to the technical field of pervious concrete, and comprising an installation bottom plate, wherein the upper surface of the installation bottom plate is provided with a cooking container, an infiltration container, a weighing device and a drying device, the cooking container, the infiltration container, the weighing device and the drying device are sequentially arranged on the upper surface of the installation bottom plate from left to right, the inner cavity of the infiltration container is transversely provided with a supporting frame, the end part of the supporting frame is fixedly connected with the inner wall of the infiltration container, and supporting bars are uniformly arranged inside the supporting frame, so that the measuring result is more accurate through a mode of regulating and determining for many times; the method and the device can be used for measuring the concrete blocks in different states, can obtain data in different states, have a real result, are more convenient to operate compared with a mode of performing microwave detection under the buried concrete, and cannot be interfered.
Description
Technical Field
The invention relates to the technical field of pervious concrete, in particular to a test device and a method for quantitatively measuring the blocking state of a pervious concrete pavement.
Background
Pervious concrete is also called porous concrete, sand-free concrete and pervious terrace. The porous lightweight concrete is prepared by mixing aggregate, cement, reinforcing agent and water, and does not contain fine aggregate.
The pervious concrete is a cellular structure with uniformly distributed pores formed by coating a thin layer of cement slurry on the surface of coarse aggregate and bonding the thin layer of cement slurry, so that the pervious concrete has the characteristics of air permeability, water permeability and light weight.
In recent years, with the proposal of the concept of 'sponge city', pervious concrete is more and more widely applied in road surface construction, while pervious concrete road surfaces have the characteristic of easy blockage in the using process, so that the permeability is reduced or even lost, and the porosity detection is an important index for reflecting the blockage state and the permeability, so that the porosity detection and exploration are required to be carried out on the road after the construction is finished and a period of time is finished.
The existing measuring equipment is not accurate enough.
Disclosure of Invention
The invention aims to provide a test device and a method for quantitatively measuring the blockage state of a pervious concrete pavement, so as to solve the problem that the measurement of the existing measurement equipment in the background technology is not accurate enough.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a test device of quantitative measurement pervious concrete road surface jam state, includes mounting plate, mounting plate's upper surface is provided with cooking vessel, infiltration container, weighing device and drying equipment, cooking vessel, infiltration container, weighing device and drying equipment from left to right arrange in proper order at mounting plate's upper surface, the inner chamber of infiltration container transversely is provided with braced frame, braced frame's tip and the inner wall fixed connection of infiltration container, braced frame's inside evenly is provided with the support bar.
Preferably, the precision of the weighing device is 0.025% to 0.05%.
Preferably, the supporting lugs are uniformly arranged on the upper surface of the supporting bar.
Preferably, the supporting protrusion has a tapered shape with a large lower portion and a small upper portion.
A test method of a test device for quantitatively measuring the blockage state of a pervious concrete pavement comprises the following specific operation steps:
s1: selecting a concrete pavement at a target position and cutting the concrete pavement to obtain concrete blocks, wherein the size of the cut concrete blocks can be placed in a cooking container, an infiltration container and drying equipment;
measuring the mass of the concrete block through a weighing device, drying and storing the concrete block in a drying device for 20-26 hours, wherein the temperature in the drying device is 120 ℃ plus 100 ℃, taking out the concrete block, measuring the mass of the concrete block again, and if the concrete block is dry relative to the primary mass measurement and the mass measured for the second time is consistent with the primary mass, determining that the concrete block is dry;
if the concrete block is not dry in the first determination, the mass of the concrete block is determined again after the concrete block is dried again, and if the mass of the third time is consistent with that of the second time, the concrete block is considered to be dry;
if the measured mass values of two successive groups differ and exceed 0.5% of the minimum value, the previous redrying process needs to be repeated until the measured mass value is below 0.5% of the minimum value, the final value is considered to be A;
s2: obtaining the dried concrete blocks obtained in the step S1, placing the concrete blocks in an infiltration container, enabling the concrete blocks to be supported on a supporting frame and a supporting strip, filling water into the infiltration container, enabling the water to be over the concrete blocks, enabling the concrete blocks to be immersed in the infiltration container for 40-50 hours, and determining that a final value is B when two continuous surfaces of the concrete blocks are wiped dry and the growth quality value is lower than 0.5% of the maximum value measured within an interval of 24 hours;
s3: the concrete block in the step S2 is obtained and placed in a cooking container, the boiling is carried out for 4 to 6 hours, the concrete block is taken out and the surface moisture of the concrete block is wiped dry under the natural condition until the water temperature in the cooking container is reduced to 20 to 30 ℃, and the mass of the concrete block is measured to be C;
s4: obtaining the concrete block obtained in the step S3, placing the concrete block in water to be in a suspension state, and determining the mass to be D;
s5: calculating, based on the measured values:
(ii) absorption after soaking in water (B-a)/a%;
absorption rate after water intake and boiling: (C-a)/a%;
bulk density, dry state ═ a/(C-D)/a ] p ═ g 1;
bulk density, non-dry state ═ B/(C-D)/a ] p;
the unit volume density after water feeding and boiling is [ C/(C-D) ] p;
bulk density [ a/(a-D) ] p ═ g 2;
a permeable pore value of (g2-g1)/g2 100;
total porosity (g2-g1)/g2 x 100.
Compared with the prior art, the invention has the beneficial effects that:
1) the measurement result is more accurate through a mode of regulating and controlling measurement for many times;
2) the method and the device can be used for measuring the concrete blocks in different states, can obtain data in different states, have a real result, are more convenient to operate compared with a mode of performing microwave detection under the buried concrete, and cannot be interfered.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of an infiltration vessel according to the present invention;
FIG. 3 is a schematic top view of the supporting frame of the present invention.
In the figure: 1 mounting a bottom plate, 2 cooking containers, 3 soaking containers, 4 weighing devices, 5 drying devices, 6 supporting frames, 7 supporting strips and 8 supporting bumps.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example (b):
referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a test device of quantitative measurement pervious concrete road surface jam state, includes mounting plate 1, mounting plate 1's upper surface is provided with cooking vessel 2, soaks container 3, weighing device 4 and drying equipment 5, cooking vessel 2, soaks container 3, weighing device 4 and drying equipment 5 arrange in proper order from left to right at mounting plate 1's upper surface, the inner chamber of soaking container 3 transversely is provided with braced frame 6, braced frame 6's tip and the inner wall fixed connection of soaking container 3, braced frame 6's inside evenly is provided with support bar 7.
Further, the precision of the weighing device 4 is 0.025% to 0.05%.
Further, the supporting lugs 8 are uniformly arranged on the upper surface of the supporting bar 7.
Further, the supporting protrusion 8 has a tapered shape with a large lower portion and a small upper portion.
A test method of a test device for quantitatively measuring the blockage state of a pervious concrete pavement comprises the following specific operation steps:
s1: selecting a concrete pavement at a target position and cutting the concrete pavement to obtain concrete blocks, wherein the size of the cut concrete blocks can be placed in the cooking container 2, the infiltration container 3 and the drying equipment 5;
measuring the mass of the concrete block by the weighing device 4, drying and storing the concrete block in the drying device 5 for 20-26 hours, wherein the temperature in the drying device 5 is 100-120 ℃, taking out the concrete block, measuring the mass of the concrete block again, and if the concrete block is dry relative to the primary mass measurement and the mass measured for the second time is consistent with the primary mass, considering the concrete block to be dry;
if the concrete block is not dry in the first determination, the mass of the concrete block is determined again after the concrete block is dried again, and if the mass of the third time is consistent with that of the second time, the concrete block is considered to be dry;
if the measured mass values of two successive groups differ and exceed 0.5% of the minimum value, the previous redrying process needs to be repeated until the measured mass value is below 0.5% of the minimum value, the final value is considered to be A;
s2: taking the dried concrete blocks obtained in the step S1, placing the concrete blocks in an infiltration container 3, enabling the concrete blocks to be supported on a supporting frame 6 and a supporting strip 7, filling water in the infiltration container 3, enabling the water to be over the concrete blocks, and enabling the concrete blocks to be immersed in the infiltration container 3 for 40-50 hours until two continuous surfaces of the concrete blocks are wiped dry and the growth mass value is lower than 0.5% of the maximum value measured within an interval of 24 hours, and determining that the final value is B;
s3: the concrete block in the step S2 is obtained and placed in a cooking container 2 to be boiled for 4-6 hours under natural conditions until the temperature of water in the cooking container 2 is reduced to 20-30 ℃, the concrete block is taken out and the surface moisture of the concrete block is wiped dry, and the mass of the concrete block is measured to be C;
s4: obtaining the concrete block obtained in the step S3, placing the concrete block in water to be in a suspension state, and determining the mass to be D;
s5: calculating, based on the measured values:
(ii) absorption after soaking in water (B-a)/a%;
absorption rate after water intake and boiling: (C-a)/a%;
bulk density, dry state ═ a/(C-D)/a ] p ═ g 1;
bulk density, non-dry state ═ B/(C-D)/a ] p;
the unit volume density after water feeding and boiling is [ C/(C-D) ] p;
bulk density [ a/(a-D) ] p ═ g 2;
a permeable pore value of (g2-g1)/g2 100;
total porosity (g2-g1)/g2 x 100.
The density of water is 1g/m3The measured value is substituted into the above calculation formula.
The blockage of the pores of the pervious concrete is usually that particles with larger particle sizes are firstly blocked in the pores to play a role of bridging, then a plurality of particles with medium particle sizes are rapidly deposited around the particles, then the particles with small particle sizes are blocked to fill the gaps among the particles, and finally the solid particles at the positions block rainwater infiltration channels in the open pores, so that the permeability of the pervious concrete is continuously reduced, the drainage capacity is gradually lost, and the service life is shortened. Under the action of rainwater runoff, the pervious concrete is blocked in three stages: the first stage is a rapid plugging stage, and the permeability coefficient is usually rapidly reduced firstly; the second stage is a partial blockage recovery stage, and the permeability coefficient is slightly increased; the third stage is a blockage stabilization stage, and the permeability coefficient slowly decreases and gradually becomes stable.
The greater the porosity, the more susceptible to plugging. Generally, the larger the porosity of the pervious concrete, the larger the pore size of the pervious concrete, the smaller the curvature of the through pore channel, the larger the effective diameter of the pore channel, the greater the infiltration speed of rainwater runoff carrying solid particles, more gravels can infiltrate into the pores of the test piece along with water flow, and when the size of the pores in the pervious concrete is changed, the more easily the larger particles are subjected to the bridging effect therein, so that the pore blockage is caused. In addition, when the porosity of the pervious concrete is large and clogging occurs, the fluctuation of the permeability coefficient thereof is large. This is because the continuous through-opening pores that are clogged are large in size, and under the action of rainwater runoff and rainwater pressure, the clogged portions may be flushed away again by rainwater and penetrated, so that the pores have drainage capability again.
While there have been shown and described the fundamental principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a test device of quantitative measurement pervious concrete road surface jam state, includes mounting plate (1), its characterized in that: the upper surface of mounting plate (1) is provided with cooking container (2), infiltration container (3), weighing device (4) and drying equipment (5), cooking container (2), infiltration container (3), weighing device (4) and drying equipment (5) from left to right arrange in proper order at the upper surface of mounting plate (1), the inner chamber of infiltration container (3) transversely is provided with braced frame (6), the tip of braced frame (6) and the inner wall fixed connection of infiltration container (3), the inside of braced frame (6) evenly is provided with support bar (7).
2. The test device for quantitatively measuring the blockage state of the pervious concrete pavement according to claim 1, is characterized in that: the precision of the weighing device (4) is 0.025% -0.05%.
3. The test device for quantitatively measuring the blockage state of the pervious concrete pavement according to claim 1, is characterized in that: and the upper surface of the supporting bar (7) is uniformly provided with supporting lugs (8).
4. The test device for quantitatively measuring the blockage state of the pervious concrete pavement according to claim 3, is characterized in that: the supporting convex block (8) is in a conical shape with a large lower part and a small upper part.
5. A test method of a test device for quantitatively measuring the blockage state of a pervious concrete pavement according to any one of claims 1 to 4, characterized in that: the test method of the test device for quantitatively measuring the blockage state of the pervious concrete pavement comprises the following specific operation steps:
s1: selecting and cutting a concrete pavement at a target position to obtain concrete blocks, and putting the cut concrete blocks into a cooking container (2), an infiltration container (3) and a drying device (5) in size;
measuring the mass of the concrete block by the weighing device (4), drying and storing the concrete block in the drying device (5) for 20-26 hours at the temperature of 100-120 ℃ in the drying device (5), taking out the concrete block, measuring the mass of the concrete block again, and if the concrete block is dry relative to the primary mass measurement and the mass measured for the second time is consistent with the primary mass, determining that the concrete block is dry;
if the concrete block is not dry in the first determination, the mass of the concrete block is determined again after the concrete block is dried again, and if the mass of the third time is consistent with that of the second time, the concrete block is considered to be dry;
if the measured mass values of two successive groups differ and exceed 0.5% of the minimum value, the previous redrying process needs to be repeated until the measured mass value is below 0.5% of the minimum value, the final value is considered to be A;
s2: taking the dried concrete blocks obtained in the step S1, placing the concrete blocks in an infiltration container (3) to enable the concrete blocks to be supported on a supporting frame (6) and a supporting strip (7), filling water in the infiltration container (3) to enable the water to be free of the concrete blocks, and enabling the concrete blocks to be immersed in the infiltration container (3) for 40-50 hours until two continuous surfaces of the concrete blocks are wiped dry and the growth quality value is lower than 0.5% of the measured maximum value within an interval of 24 hours, wherein the final value is determined as B;
s3: the concrete block in the step S2 is obtained and placed in a cooking container (2), the concrete block is boiled for 4 to 6 hours under natural conditions until the water temperature in the cooking container (2) is reduced to 20 to 30 ℃, the concrete block is taken out and the surface moisture of the concrete block is wiped dry, and the mass of the concrete block is measured to be C;
s4: obtaining the concrete block obtained in the step S3, placing the concrete block in water to be in a suspension state, and determining the mass to be D;
s5: calculating, based on the measured values:
(ii) absorption after soaking in water (B-a)/a%;
absorption rate after water intake and boiling: (C-a)/a%;
bulk density, dry state ═ a/(C-D)/a ] p ═ g 1;
bulk density, non-dry state ═ B/(C-D)/a ] p;
the unit volume density after water feeding and boiling is [ C/(C-D) ] p;
bulk density [ a/(a-D) ] p ═ g 2;
a permeable pore value of (g2-g1)/g2 100;
total porosity (g2-g1)/g2 x 100.
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2020
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Application publication date: 20201211 |