CN107677587A - A kind of method of testing of pervious concrete porosity - Google Patents
A kind of method of testing of pervious concrete porosity Download PDFInfo
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- CN107677587A CN107677587A CN201711166923.4A CN201711166923A CN107677587A CN 107677587 A CN107677587 A CN 107677587A CN 201711166923 A CN201711166923 A CN 201711166923A CN 107677587 A CN107677587 A CN 107677587A
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- 239000011380 pervious concrete Substances 0.000 title claims abstract description 55
- 238000010998 test method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 238000009527 percussion Methods 0.000 claims abstract description 16
- 230000001186 cumulative effect Effects 0.000 claims abstract description 13
- 239000003643 water by type Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 23
- 239000004567 concrete Substances 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000007796 conventional method Methods 0.000 abstract description 6
- 238000007654 immersion Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000012744 reinforcing agent Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
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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
- G01N15/088—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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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a kind of method of testing of pervious concrete porosity：Sampled in pervious concrete to be measured, obtain cylindrical core sample, calculate the cumulative volume V of core sampleT；Weighed after core sample is dried, obtain the dry weight W of core sampleD；Dried core sample is immersed in after keeping 25~35min in water, taps core sample, overturn 180 °, weigh its submergence quality W in waterS；The porosity of pervious concrete is calculated according to formula.Core sample is immersed in 25~35min of holding in water by the present invention, pass through the percussion to core sample, gas in the hole of core sample is quickly discharged into core sample, obtain the submergence quality of core sample, it is then based on Archimedes and law of buoyancy, the buoyancy that i.e. fluid partially or completely submerges to test specimen is equal to the weight for the liquid volume that test specimen is discharged in itself, can obtain pervious concrete porosity in a short time.Test result indicates that method of testing provided by the invention Immersion time compared with conventional method is short, test result is stable.
Description
Technical field
The present invention relates to technical field of civil engineering, more particularly to a kind of method of testing of pervious concrete porosity.
Background technology
China's gross amount of water resources is although more, but per capita water resource is extremely poor, is water shortage well-known in the world
Big country.From after the 1990s, avoid laying hard surface as far as possible as the way of city of the world's construction common recognition, laying
Pervious surface is seen as city and improves environmental quality, reduces noise, prevention floods and the important measures for retaining resource.In recent years
Come, urban waterlogging Frequent Accidents caused by heavy rain, loss is brought to the national and personal security of the lives and property in varying degrees.For
Solve urban waterlogging from root, needed based on sponge urban construction, porous pavement design is introduced into urban construction.Permeable road
Face design is to utilize the pore channel in seepy material to cause Rainfall Condition rain penetration to underground, so as to reduce rainwash,
Alleviate urban waterlogging.At present, there is the practical application example using pervious concrete as pavement material countries in the world, contribute to
Weaken the effect densely populated areas flood and runoff water the problems such as.Its special structure make its not only have it is good it is ventilative,
Water penetration, and with ecological environment benefits such as good cooling, noise reduction, improvement environment.The most prominent practicality of pervious concrete
Property when being a large amount of rainfalls, it is drained to urban precipitation and the solution of safe water storage problem provides huge help.Using saturating
When water coagulation soil is as road surface, bank protection or Other Engineering, draining, antiskid, sound-absorbing, noise reduction, infiltration effect can be obtained, can improve ground
Table ecological circulation, beneficial to moving traffic safety, living environment is protected, solved because what extensive Modernized City Construction was brought bears
Face rings.
Pervious concrete is ventilative saturating by a series of having of forming of holes being connected and concrete solid part skeleton
The concrete of water-based loose structure.As a kind of porous material, porosity is the most important physical property of pervious concrete.Thoroughly
Water coagulation soil major design should ensure that material structure can convey current by the way that while it is strong also to keep reaching enough mechanics
Degree.From main composition, pervious concrete is different from normal concrete, permeable concrete only have a small amount of fine aggregate or
Without fine aggregate：From it is each it is bonding from, particle glued after being hardened mainly by the cementing material slurry for being wrapped in coarse aggregate surface
Knot is together.The functional characteristic of the water-permeable and air permeable of pervious concrete depends primarily on its unique loose structure characteristic.Thus certainly
The key for determining pervious concrete works quality is porosity, and domestic and international permeable concrete porosity is generally 5~25%, more
The porosity of hole concrete is affected by many factors, there is porous concrete aggregates grading, cement-aggregate ratio, the ratio of mud, compactive effort etc..Cause
The porosity of this celluar concrete is easily impacted and changes, and the detection to the porosity of concrete is very necessary and significant
's.
After test specimen is submerged 24 hours by the method for traditional measure pervious concrete porosity in water, it is determined in water
Submergence quality, calculate porosity, but the testing time that the assay method needs is longer.
The content of the invention
It is an object of the invention to provide a kind of method of testing of pervious concrete porosity.Test side provided by the invention
Method can quickly determine the porosity of pervious concrete.
The invention provides a kind of method of testing of pervious concrete porosity, comprise the following steps：
(1) sampled in pervious concrete to be measured, obtain cylindrical core sample, calculate the cumulative volume V of core sampleT；
(2) weighed after the core sample is dried, obtain the dry weight W of the core sampleD；
(3) the dried core sample is immersed in after keeping 25~35min in water, taps core sample, then turn over core sample
Turn 180 °, weigh submergence quality W of the core sample in waterS；The percussion, upset and weighing process keep core sample to be submerged in water；
(4) the porosity P of pervious concrete to be measured is calculated according to formula shown in formula I
P (%)=[1- ((WD-WS)/ρw)/VTThe formula of] × 100 I
ρ in the formula IwFor the density of water under test temperature.
Preferably, the pervious concrete includes cast-in-place pervious concrete or the pervious concrete using scene.
Preferably, the position of sampling is the core of pervious concrete to be measured in the step (1).
Preferably, also include to the polishing for sampling obtained sample after being sampled in the step (1).
Preferably, the cumulative volume V of the core sampleTAfter height and diameter by measuring core sample, according to the volume of cylinder
Calculation formula is calculated.
Preferably, the temperature dried in the step (2) is 28~38 DEG C, and the dry time is more than 24h.
Preferably, when being submerged in the step (3), the axially vertical horizontal plane of the core sample is immersed in water.
Preferably, the number tapped in the step (3) is 4~6 times.
Preferably, the percussion in the step (3) is that the container bottom for holding water is hit with core sample.
Preferably, the dynamics tapped in the step (3) is not to cause damage to be defined in core sample and container.
The invention provides a kind of method of testing of pervious concrete porosity, comprise the following steps：To be measured permeable mixed
Sampled in solidifying soil, obtain cylindrical core sample, calculate the cumulative volume V of core sampleT；Weigh, obtain described after the core sample is dried
The dry weight W of core sampleD；The dried core sample is immersed in after keeping 25~35min in water, core sample is tapped, then by core
Sample overturns 180 °, weighs submergence quality W of the core sample in waterS；The percussion, upset and weighing process keep core sample to be soaked in water
Not yet；According to P (%)=[1- ((WD-WS)/ρw)/VT] × 100 formula calculates the porosity P of pervious concrete to be measured, ρ in formulawFor
The density of water under test temperature.Core sample is immersed in water after 25~35min of holding by the present invention, will by the percussion to core sample
Gas in the hole of core sample quickly discharges core sample, makes the hole in water filled core sample, obtains the submergence quality of core sample, Ran Houji
In Archimedes and law of buoyancy, i.e., the buoyancy that fluid partially or completely submerges to test specimen is equal to the liquid bulk that test specimen is discharged in itself
Long-pending weight, it can obtain pervious concrete porosity in a short time.Test result indicates that method of testing provided by the invention
Immersion time is short compared with conventional method, and test result is accurate.
Embodiment
The invention provides a kind of method of testing of pervious concrete porosity, comprise the following steps：
(1) sampled in pervious concrete to be measured, obtain cylindrical core sample, calculate the cumulative volume V of core sampleT；
(2) weighed after the core sample is dried, obtain the dry weight W of the core sampleD；
(3) the dried core sample is immersed in after keeping 25~35min in water, taps core sample, then turn over core sample
Turn 180 °, weigh submergence quality W of the core sample in waterS；The percussion, upset and weighing process keep core sample to be submerged in water；
(4) the porosity P of pervious concrete to be measured is calculated according to formula shown in formula I
P (%)=[1- ((WD-WS)/ρw)/VTThe formula of] × 100 I
ρ in the formula IwFor the density of water under test temperature.
The present invention samples in pervious concrete to be measured, obtains cylindrical core sample, calculates the cumulative volume V of core sampleT.At this
In invention, the pervious concrete preferably includes cast-in-place pervious concrete or the pervious concrete using scene.The present invention is to institute
Stating the composition of pervious concrete and species does not have special restriction, and method of testing provided by the invention is applied to any condition and kind
The measure of the pervious concrete porosity of class.
In the present invention, the position of the sampling is preferably the core of pervious concrete to be measured.The present invention is to the sampling
Quantity there is no special restriction, according to scene demand be sampled.
In the present invention, also include to the polishing for sampling obtained sample after the sampling.The present invention is to the sample
The no special restriction of operation of the polishing of product, using the technical scheme of polishing sample well known to those skilled in the art.
In the present invention, when the cylinder that the sampling obtains is lack of standardization, the polishing can obtain the cylindrical core sample of specification,
It is easy to the measurement of size and the calculating of volume.
In the present invention, the cumulative volume V of the core sampleTIt is preferred that after height and diameter by measuring core sample, according to cylinder
The volume calculation formula of body is calculated.It is of the invention that multiple diverse locations measure its height H preferably on coring sampleiWith diameter Di, so
After average height H is calculatedavgWith average diameter Davg, preferably three diverse locations.In the present invention, the core sample is total
Volume VTCalculation formula preferably as shown in formula II
In the present invention, the cumulative volume of the core sample is the volume of hole and the volume sum of solid portion.
After obtaining core sample, the present invention weighs after the core sample is dried, and obtains the dry weight W of the core sampleD.In the present invention
In, the temperature of the drying is preferably 28~38 DEG C, more preferably 30~36 DEG C, most preferably 32~34 DEG C；The drying
Time is preferably more than 24h, more preferably 24~36h, most preferably 26~30h.In the present invention, the time of the drying with
Untill core sample no longer weightlessness.In the present invention, the drying can make moisture removal remaining in pervious concrete, improve test
The degree of accuracy.
After the completion of drying, the dried core sample is immersed in water after 25~35min of holding by the present invention, taps core
Sample, core sample is then overturn 180 °, weigh submergence quality W of the core sample in waterS；It is described to tap, overturn and weigh process holding
Core sample submerges in water.In the present invention, during submergence, the axial preferred vertical horizontal plane of the core sample is immersed in water.At this
In invention, the submergence mode of the core sample can be easy to the discharge of gas in follow-up percussion step, and it is accurate further to improve test
Exactness.
In the present invention, the number of the percussion is preferably 4~6 times, more preferably 5 times.The present invention is to the percussion
Mode does not have special restriction, using the method for percussion well known to those skilled in the art.In the present invention, the percussion
The container bottom for holding water is preferably hit with core sample.In the present invention, the dynamics of the percussion is not preferably with to core sample and appearance
Device causes damage to be defined.In the present invention, the percussion can be such that the gas in the hole of core sample is separated with core sample, promote gas
Discharge, shorten Immersion time.
After the completion of percussion, the core sample is overturn 180 ° by the present invention, weighs submergence quality W of the core sample in waterS；It is described to strike
Hitting, overturn and weigh process keeps core sample to be submerged in water.In the present invention, the upset makes the gas in the hole of core sample fast
Speed discharge core sample, improve the speed of the hole of water filled core sample.Operation no special restriction of the present invention to the weighing, is adopted
With the technical scheme of weighing well known to those skilled in the art.
After the completion of weighing, the present invention calculates the porosity P of pervious concrete to be measured according to formula shown in formula I
P (%)=[1- ((WD-WS)/ρw)/VTThe formula of] × 100 I
ρ in the formula IwFor the density of water under test temperature.
In the present invention, the test temperature is preferably the temperature of submergence water.
In order to further illustrate the present invention, with reference to survey of the embodiment to pervious concrete porosity provided by the invention
Method for testing is described in detail, but they can not be interpreted as into limiting the scope of the present invention.
Embodiment 1:
1. obtaining pervious concrete plate from certain scene, its original proportioning is shown in Table 1, and coring obtains 6 cylindrical core samples.
Core sample both ends are polished flat.
The pervious concrete of 1 embodiment of table 1 matches
| Composition | Cement | Stone | Water | Reinforcing agent | Design porosity |
| Quality (kg) | 445 | 1530 | 124 | 23.4 | 15% |
2. pervious concrete cylinder core sample is weighed into its dry weight W after 35 DEG C are dried 24 hoursD, it is shown in Table 2.
3. measuring its height and diameter in the representational place of each three, sample, calculate it and be averagely worth to mean height
Spend HavgWith average diameter Davg, and record and be shown in Table 2.
4. the cumulative volume V of sample is calculated according to formulaT, it is shown in Table 2.
It is that 1,2,3 test specimens submerge 24 hours in water by numbering 5. in the container full of running water, surveys it and submerge quality
WS。
6. being that 4,5,6 test specimens are disposed vertically and are totally submerged 30 minutes under water by numbering, underwater sample is being held afterwards
Device bottom is gently hit five times, and sample is overturn into 180 °, is surveyed it and is submerged quality WS。
7. measuring the water temperature of submergence, and check in corresponding water density under surveyed water temperature.
The porosity of institute's coring test specimen is calculated using formula, as shown in table 2.
The conventional method of table 2 contrasts with the present embodiment method test result
Embodiment 2:
1. obtaining pervious concrete plate from certain scene, its original proportioning is shown in Table 3, and coring obtains 6 cylindrical core samples.
Core sample both ends are polished flat.
The pervious concrete of 3 embodiment of table 2 matches
| Composition | Cement | Stone | Water | Reinforcing agent | Design porosity |
| Quality (kg) | 389 | 1530 | 102.6 | 20.5 | 20% |
2. pervious concrete cylinder core sample is weighed into its dry weight W after 35 DEG C are dried 24 hoursD, it is shown in Table 4.
3. measuring its height and diameter in the representational place of each three, sample, calculate it and be averagely worth to mean height
Spend HavgWith average diameter Davg, and record and be shown in Table 4.
4. the cumulative volume V of sample is calculated according to formulaT, it is shown in Table 4.
It is that 1,2,3 test specimens submerge 24 hours in water by numbering 5. in the container full of running water, surveys it and submerge quality
WS。
6. being that 4,5,6 test specimens are disposed vertically and are totally submerged 30 minutes under water by numbering, underwater sample is being held afterwards
Device bottom is gently hit five times, and sample is overturn into 180 °, is surveyed it and is submerged quality WS。
7. measuring the water temperature of submergence, and check in corresponding water density under surveyed water temperature.
The porosity of institute's coring test specimen is calculated using formula, as shown in table 4.
The conventional method of table 4 contrasts with the present embodiment method test result
Embodiment 3:
1. obtaining pervious concrete plate from certain scene, its original proportioning see the table below 5, and coring obtains 6 cylindrical cores
Sample.Core sample both ends are polished flat.
The pervious concrete of 5 embodiment of table 3 matches
| Composition | Cement | Stone | Water | Reinforcing agent | Design porosity |
| Quality (kg) | 316 | 1530 | 83.25 | 16.67 | 25% |
2. pervious concrete cylinder core sample is weighed into its dry weight W after 35 DEG C are dried 24 hoursD, see the table below 6.
3. measuring its height and diameter in the representational place of each three, sample, calculate it and be averagely worth to mean height
Spend HavgWith average diameter Davg, and record, 6 are shown in Table respectively.
4. the cumulative volume V of sample is calculated according to formulaT, it is shown in Table 6.
It is that 1,2,3 test specimens submerge 24 hours in water by numbering 5. in the container full of running water, surveys it and submerge quality
WS。
6. being that 4,5,6 test specimens are disposed vertically and are totally submerged 30 minutes under water by numbering, underwater sample is being held afterwards
Device bottom is gently hit five times, and sample is overturn into 180 °, is surveyed it and is submerged quality WS。
7. measuring the water temperature of submergence, and check in corresponding water density under surveyed water temperature.Institute's coring is calculated using formula
The porosity of test specimen, as shown in table 6.
The conventional method of table 6 contrasts with the present embodiment method test result
As can be seen from the above embodiments, method of testing efficiency high provided by the invention, and with 24 hours of traditional approach
Contrast, the discharge degree of the air inside test specimen is suitable, i.e., can reach identical with conventional method using this improved method
Result.
Described above is only the preferred embodiment of the present invention, not makees any formal limitation to the present invention.Should
Point out, for those skilled in the art, under the premise without departing from the principles of the invention, if can also make
Dry improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of method of testing of pervious concrete porosity, comprises the following steps：
(1) sampled in pervious concrete to be measured, obtain cylindrical core sample, calculate the cumulative volume V of core sampleT；
(2) weighed after the core sample is dried, obtain the dry weight W of the core sampleD；
(3) the dried core sample is immersed in after keeping 25~35min in water, taps core sample, then overturn core sample
180 °, weigh submergence quality W of the core sample in waterS；The percussion, upset and weighing process keep core sample to be submerged in water；
(4) the porosity P of pervious concrete to be measured is calculated according to formula shown in formula I
P (%)=[1- ((WD-WS)/ρw)/VTThe formula of] × 100 I
ρ in the formula IwFor the density of water under test temperature.
2. according to the method for claim 1, it is characterised in that the pervious concrete includes cast-in-place pervious concrete or made
With the pervious concrete at scene.
3. method according to claim 1 or 2, it is characterised in that the position of sampling is to be measured permeable in the step (1)
The core of concrete.
4. method according to claim 1 or 2, it is characterised in that also include taking to described after sampling in the step (1)
The polishing for the sample that sample obtains.
5. method according to claim 1 or 2, it is characterised in that the cumulative volume V of the core sampleTBy the height for measuring core sample
After degree and diameter, it is calculated according to the volume calculation formula of cylinder.
6. method according to claim 1 or 2, it is characterised in that the temperature dried in the step (2) is 28~38
DEG C, the dry time is more than 24h.
7. method according to claim 1 or 2, it is characterised in that when being submerged in the step (3), the axle of the core sample
It is immersed in vertical level in water.
8. method according to claim 1 or 2, it is characterised in that the number tapped in the step (3) is 4~6 times.
9. according to the method for claim 8, it is characterised in that the percussion in the step (3) is to be hit to hold with core sample
The container bottom of water.
10. according to the method for claim 9, it is characterised in that the dynamics tapped in the step (3) with not to core sample and
Container causes damage to be defined.
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| US10422916B2 (en) * | 2017-08-10 | 2019-09-24 | Saudi Arabian Oil Company | Methods and systems for determining bulk density, porosity, and pore size distribution of subsurface formations |
| CN112067491A (en) * | 2020-08-10 | 2020-12-11 | 滁州职业技术学院 | Test device and method for quantitatively measuring blockage state of pervious concrete pavement |
| CN113607624A (en) * | 2021-09-02 | 2021-11-05 | 山东圣阳电源股份有限公司 | Porosity measurement method, device, equipment and system |
| CN113756866A (en) * | 2021-09-24 | 2021-12-07 | 中北大学 | Construction parameter determination method for independently adopting coal ash as coal gangue dump covering layer |
| CN114782823A (en) * | 2022-06-14 | 2022-07-22 | 江西省水利科学院 | Rock-fill dam volume weight detection method based on drilling coring and in-hole image recognition |
| CN116858751A (en) * | 2023-09-05 | 2023-10-10 | 安徽省交通规划设计研究总院股份有限公司 | Permeable concrete pavement porosity measuring and calculating method based on representative vehicle type sound processing |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10422916B2 (en) * | 2017-08-10 | 2019-09-24 | Saudi Arabian Oil Company | Methods and systems for determining bulk density, porosity, and pore size distribution of subsurface formations |
| CN112067491A (en) * | 2020-08-10 | 2020-12-11 | 滁州职业技术学院 | Test device and method for quantitatively measuring blockage state of pervious concrete pavement |
| CN113607624A (en) * | 2021-09-02 | 2021-11-05 | 山东圣阳电源股份有限公司 | Porosity measurement method, device, equipment and system |
| CN113756866A (en) * | 2021-09-24 | 2021-12-07 | 中北大学 | Construction parameter determination method for independently adopting coal ash as coal gangue dump covering layer |
| CN114782823A (en) * | 2022-06-14 | 2022-07-22 | 江西省水利科学院 | Rock-fill dam volume weight detection method based on drilling coring and in-hole image recognition |
| CN114782823B (en) * | 2022-06-14 | 2022-09-02 | 江西省水利科学院 | Rock-fill dam volume weight detection method based on drilling coring and in-hole image recognition |
| CN116858751A (en) * | 2023-09-05 | 2023-10-10 | 安徽省交通规划设计研究总院股份有限公司 | Permeable concrete pavement porosity measuring and calculating method based on representative vehicle type sound processing |
| CN116858751B (en) * | 2023-09-05 | 2023-11-17 | 安徽省交通规划设计研究总院股份有限公司 | Permeable concrete pavement porosity measuring and calculating method based on representative vehicle type sound processing |
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