CN108956426A - A kind of pervious concrete alkali soluble output detection method for simulating pore structure - Google Patents
A kind of pervious concrete alkali soluble output detection method for simulating pore structure Download PDFInfo
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- CN108956426A CN108956426A CN201810937858.9A CN201810937858A CN108956426A CN 108956426 A CN108956426 A CN 108956426A CN 201810937858 A CN201810937858 A CN 201810937858A CN 108956426 A CN108956426 A CN 108956426A
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- rod iron
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- 239000011380 pervious concrete Substances 0.000 title claims abstract description 65
- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 239000003513 alkali Substances 0.000 title claims abstract description 20
- 239000011148 porous material Substances 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 239000004567 concrete Substances 0.000 claims abstract description 37
- 238000002791 soaking Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 14
- 239000010935 stainless steel Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000012153 distilled water Substances 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 238000007654 immersion Methods 0.000 claims abstract description 3
- 229910000754 Wrought iron Inorganic materials 0.000 claims description 37
- 239000004568 cement Substances 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 11
- 238000012423 maintenance Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 238000001802 infusion Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000011056 performance test Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007922 dissolution test Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000000956 solid--liquid extraction Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- 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
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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)
- Analysing Materials By The Use Of Radiation (AREA)
- Prostheses (AREA)
Abstract
The invention belongs to concrete fields, it is specifically a kind of pervious concrete alkali soluble output detection method for simulating pore structure, the method utilizes the pervious concrete test block of pre-buried steel stick simulating pore structure, then it carries out alkali soluble and goes out performance test, it is placed on the stainless steel stent in soaking box including pervious concrete test block with after distilled water immersion to preset time, the soak in hole and in soaking box is extracted with syringe, soak pH value is detected using acidometer.This method solve concrete alkalis in the prior art to dissolve out detection inaccuracy, distortion and problem at high cost etc., has achieved the effect that pervious concrete pore structure is controllable, detection accuracy is high, can detect the variation of different aperture internal pH simultaneously, is easy to operate.
Description
Technical field
The present invention relates to concrete fields, and in particular to it is a kind of simulate pore structure pervious concrete alkali soluble go out detection side
Method.
Background technique
Pervious concrete is typical porous media material, be by coarse aggregate, binder and water and additive mixing and
At a kind of lightweight non-fine concrete form point bonding and portion under binder effect between coarse aggregate due to being free of fine aggregate
Facet bonding constitutes loose more empty honeycomb structures, therefore has the characteristics that ventilative, permeable and light-weight.Hole contained by its inside
It is divided into dead-end pore, semi-connected hole and interconnected pore, and pore-size is not of uniform size, distributing position is also different, therefore its hole
Gap has inhomogeneities and anisotropy.
Although advantage of the pervious concrete in terms of environment and ecology has reason to become the heat of concrete research in future
One of point, but become presently, there are several key technical problems and restrict its bottleneck promoted and applied, wherein outside pervious concrete
The control technology of infiltration property " alkali ", due to the alkalinity that there is cement concrete itself pH value to be up to 13 or more, if these basic species
Matter penetrates into the soil of covering thereon, causes the salinization of soil, mortality will be caused to endanger the long term growth of vegetation.And it is right
Itself in concrete, maintaining higher alkalinity is to guarantee its chemical component and the stable basic condition of macro property.Cause
This, carries out basicity detection to concrete and is of great significance in engineering.
In the prior art there are also the method for detection, cube specimen is directly put into the appearance containing distilled water by some documents
In device, measure the ph value of water soak, but the measuring method can not the type of size and hole to hole control, no
The basicity at each position of concrete can accurately be measured.In addition there are also " solid-liquid extractions ", and pervious concrete is crushed,
And pulverize, it is added in distilled water, measures the pH value of soak, but surveyed pH value is higher, not with the basicity under true environment
Symbol.Document " the drop alkali technology and planting effect of concrete for plant growth are studied ", Liao Wenyu etc., practical technique, the 7th phase, 2013 7
Month, it uses " cement paste test block XRD analysis method ", i.e., cement briquette was conserved to regulation age, test block is dried and ground
Grinds utilize the CA (OH) in XRD analysis test block2Content and pervious concrete pore structure alkali soluble artificial situation.But it should
The experimentation cost of XRD used in method and technical requirements are higher, do not have universality.
Summary of the invention
The purpose of the present invention is to the disadvantages mentioned above of present technology, provide a kind of pervious concrete for simulating pore structure
Alkali soluble output detection method.
The technical solution for realizing the aim of the invention is as follows:
A kind of pervious concrete alkali soluble output detection method for simulating pore structure, which is characterized in that the method is saturating in preparation
When water coagulation soil test block, the pore structure of pervious concrete test block is simulated in the way of pre-buried rod iron, then by pervious concrete
Test block is placed on the stainless steel stent in soaking box with after distilled water immersion to preset time, is extracted in hole and is soaked with syringe
The soak in case is steeped, soak pH value is detected using acidometer.
The pervious concrete test block the preparation method is as follows:
According to default effective drainage porosity, half effective drainage porosity, inside concrete rod iron length, rod iron diameter are partially protruded into,
It can calculate and partially protrude into inside concrete rod iron quantity and across inside concrete rod iron quantity；
Each screw thread rod iron is passed through into the hole that pervious concrete die surface is beaten in advance, is set on the screw thread rod iron of the outer side of hole
There is nut, and adjusts the length that screw thread rod iron protrudes into pervious concrete mold by rotating nuts；The pervious concrete mold
And screw-thread steel rod brush release agent；
By match ratio identical as pervious concrete to be detected, but coarse aggregate is rejected, cement slurry is prepared, by cement slurry
It is poured into pervious concrete mold, is statically placed in after vibratory compaction in concrete standard fog room, and is permeable with plastic film covering
Concrete mold surface, the screw thread rod iron of rotation in every 30 minutes, extracts screw thread rod iron out after cement slurry final set, concrete
It is demoulded after standing 1d in standard curing room, and continues maintenance to 7d age.
The pervious concrete mold by having a size of 150mm × 150mm × 150mm concrete standard steel mold,
Surface is beaten number round hole and is made.
The curing condition of the standard curing room is 20 DEG C ± 2 DEG C, and humidity is not less than 95%.
The screw thread rod iron diameter is Ф 2, Ф 4, Ф 6, Ф 8, Ф 10.
The alkali soluble output detection method are as follows: soaking box (1) is placed in standard curing room, stainless steel stent is placed in soaking box
It is interior, pervious concrete test block is placed on stainless steel stent, distilled water is injected into soaking box and to the water surface higher than pervious concrete
Pervious concrete test block is dipped to 1d, 3d, 7d, 14d, 21d, 28d, 2 months, 3 months, is distinguished with syringe by test block 100mm
The soak in hole and in soaking box is extracted, detects soak pH value with acidometer, every kind of soak takes the flat of 3 detected values
For mean value as final result, the every 7d replacement of soak is primary.
The soaking box includes case lid, cabinet, drainpipe, valve, and the soaking box is by organic glass or plastic production.
The syringe is common medical syringe, and when injector length is inadequate, connection medical infusion lines are used.
Compared with prior art, the present invention its remarkable advantage:
(1) different types of pore interior soak pH value can be detected simultaneously, is more advantageous to reflection different aperture micro-loop
Alkali soluble artificial situation in border.
(2) the pervious concrete test block tested eliminates coarse aggregate, avoids coarse aggregate to pervious concrete homogenieity, hole
The adverse effect of gap structure, test block size makes alkali soluble go out test result reliability higher.
Detailed description of the invention
Pervious concrete soaking state schematic diagram Fig. 1 of the invention.
Soaking box stereoscopic schematic diagram Fig. 2 of the invention.
Stainless steel stent schematic diagram Fig. 3 of the invention.
Pervious concrete mold schematic diagram Fig. 4 of the invention.
The pervious concrete test block schematic diagram of simulation pore structure Fig. 5 of the invention.
The meaning of representative is marked in figure are as follows:
Soaking box -1, drainpipe -2, valve -3, stainless steel stent -4, pervious concrete test block -5, hole -6, cabinet -7,
Case lid -8, pervious concrete mold -9, hole -10, screw thread rod iron -11, nut -12, distilled water -13.
Specific embodiment
Pervious concrete is a kind of porous concrete material, and hole is divided into active porosity, half active porosity and invalid hole
Gap.Active porosity is the interconnected pore that both ends are open, and water can pass through；Half active porosity is open at one end, other end closing
Hole, this hole can store water, but cannot pass water through；Invalid hole is the hole being completely sealed in inside slurry,
This hole is unable to water storage, can not pass water through.
Pervious concrete is mainly used for road construction and slope greening, and the alkali dissolving out capability of pervious concrete directly affects mixed
The durability and plant performance for coagulating soil establish reliable pervious concrete alkali soluble and go out test method to this kind of concrete performance of guarantee
With important engineering significance.Since invalid hole goes out to influence can be neglected on pervious concrete alkali soluble, therefore the present invention does not examine
Consider invalid hole.
The design concept of pervious concrete is that rubble surface is wrapped to the cement slurry of filling certain volume in rubble gap
It covers and rubble bonding is become whole, remaining gap becomes active porosity, half active porosity and invalid hole in rubble, commonly uses
Rubble voidage is generally within 45%, i.e., pervious concrete voidage limiting value is 45% or so.
Porosity is pressed such as formula (1) and is calculated:
In formula: P-design porosity, %；
R-rod iron radius, m；
Length of the l-rod iron in inside concrete ,≤0.15m；
N-rod iron quantity；
VC- concrete test block volume can use 0.003375m3。
1. hole of table and rod iron setup parameter
2. alkali soluble of table goes out testing result
| 1d | 3d | 7d | 14d | 28d | 2 months | March | |
| The outer soak pH value of test block | 13.2 | 13.0 | 12.7 | 11.0 | 10.1 | 9.5 | 9.1 |
| PH value in effective drainage porosity | 13.3 | 13.1 | 12.8 | 11.4 | 10.3 | 9.8 | 9.1 |
| PH value in half active porosity | 13.5 | 13.4 | 13.0 | 12.0 | 11.2 | 10.1 | 9.1 |
Such as table 1, by default effective drainage porosity, half effective drainage porosity, inside concrete rod iron length, rod iron are partially protruded into
Diameter can be calculated separately out by formula (1) and partially protrude into inside concrete rod iron quantity and across inside concrete rod iron number
Amount, and the pervious concrete test specimen for presetting effective drainage porosity and half effective drainage porosity is prepared based on this, and it is permeable to detect each age
In concrete pore rate and concrete outside pH value.
As shown in Figures 1 to 4, number round hole 10 is beaten using each surface of normal concrete mold, makes a variety of different-diameters
Screw thread rod iron 11, and match nut 12, nut 12 is mounted on screw thread rod iron 11 and obtains pervious concrete mold 9；With organic
Glass plate or plastic plate bonding are fabricated to cabinet 7, case lid 8 and install the drainpipe 2 with valve 3 in body side bottom；It utilizes
Stainless steel stent 4 is made in stainless steel lath；The pervious concrete test block 5 of default half active porosity, active porosity is formed, standard is supported
Pervious concrete test block 5 is placed on the stainless steel stent 4 in soaking box 1 after guard strip part maintenance 7d, distilled water is injected and makes water
Face is higher by 5 upper surface 100mm of pervious concrete test block, is mixed after preset time is stood in standard curing room with syringe extraction is permeable
Soak inside and out solidifying soil test block different aperture 6, detects soak pH value, the soak pH value of same area with acidometer
The average value of 3 testing results is as final result.
Test and detecting step
(1) instrument prepares:
Soaking box, concrete mold are installed, determined according to half active porosity of default pervious concrete, active porosity
The diameter of screw thread rod iron, radical, the length for protruding into mold, mold and screw-thread steel rod brush release agent.
(2) pervious concrete test block preparation and maintenance:
By match ratio identical as pervious concrete to be detected, but coarse aggregate is rejected, cement slurry is prepared, by cement slurry
It is poured into mold, vibratory compaction is placed on standard curing room, and (20 DEG C ± 2 DEG C, humidity is interior not less than 95%), plastic film covering
Concrete mold surface, the screw thread rod iron of rotation in every 30 minutes, extracts screw thread rod iron out after cement slurry final set, concrete
1d postposition demoulding, in continuing maintenance in standard curing room to 7d.
(3) pervious concrete test block alkali dissolution test:
Soaking box is placed in standard curing room, stainless steel stent is placed in soaking box, pervious concrete test block is placed in
On stainless steel stent, distilled water is injected into soaking box and is higher than pervious concrete test block 100mm to the water surface, is standing and soaking.
(4) microenvironment and outside soak pH detection and evaluation in hole:
1d, 3d, 7d, 14d, 21d, 28d, 2 months, 3 months are dipped to pervious concrete test block, are taken out respectively with syringe
The soak in half active porosity, in active porosity and outside test block is taken, detects soak pH value, every kind of soak with acidometer
Take the average value of 3 detected values as final result, the every 7d replacement of soak is primary.
Claims (8)
1. it is a kind of simulate pore structure pervious concrete alkali soluble output detection method, which is characterized in that the method prepare it is permeable
When concrete test block, the pore structure of pervious concrete test block is simulated in the way of pre-buried rod iron, then tries pervious concrete
Block is placed on the stainless steel stent (4) in soaking box (1) with after distilled water immersion to preset time, is extracted in hole with syringe
With the soak in soaking box, soak pH value is detected using acidometer.
2. detection method according to claim 1, which is characterized in that the preparation method of the pervious concrete test block is such as
Under:
According to default effective drainage porosity, half effective drainage porosity, inside concrete rod iron length, rod iron diameter are partially protruded into, can be counted
Calculating partially protrudes into inside concrete rod iron quantity and passes through inside concrete rod iron quantity；
Each screw thread rod iron (11) is passed through into the hole (10) that pervious concrete mold (9) surface is beaten in advance, hole (10) outer side
Screw thread rod iron (11) is equipped with nut (12), and protrudes into pervious concrete mould by rotating nuts (12) adjustment screw thread rod iron (11)
Has the length of (9)；The pervious concrete mold (9) and screw thread rod iron (11) brush release agent；
By match ratio identical as pervious concrete to be detected, but coarse aggregate is rejected, prepares cement slurry, cement slurry is poured
Enter pervious concrete mold (9), be statically placed in concrete standard fog room after vibratory compaction, and is permeable mixed with plastic film covering
Solidifying clay model has (9) surface, and the screw thread rod iron (11) of rotation in every 30 minutes takes out screw thread rod iron (11) after cement slurry final set
Out, it is demoulded after standing 1d in concrete standard fog room, and continues maintenance to 7d age.
3. detection method according to claim 2, which is characterized in that the pervious concrete mold (9) is by size
For 150mm × 150mm × 150mm concrete standard steel mold, surface is beaten number round hole and is made.
4. detection method according to claim 3, which is characterized in that the curing condition of the standard curing room be 20 DEG C ±
2 DEG C, humidity is not less than 95%.
5. detection method according to claim 4, which is characterized in that screw thread rod iron (11) diameter is Ф 2, Ф 4, Ф
6、Ф8、Ф10。
6. detection method according to claim 5, which is characterized in that the alkali soluble output detection method are as follows: by soaking box (1)
It is placed in standard curing room, stainless steel stent (4) is placed in soaking box (1), pervious concrete test block (5) is placed in stainless steel branch
On frame (4), it is higher than pervious concrete test block 100mm by distilled water injection soaking box (1) and to the water surface, by pervious concrete test block
(5) 1d, 3d, 7d, 14d, 21d, 28d, 2 months, 3 months are dipped to, are extracted in hole and in soaking box respectively with syringe
Soak detects soak pH value with acidometer, and every kind of soak takes the average value of 3 detected values as final result, impregnates
The every 7d replacement of liquid is primary.
7. detection method according to claim 6, which is characterized in that the soaking box (1) includes case lid (8), cabinet
(7), drainpipe (2), valve (2), the soaking box (1) is by organic glass or plastic production.
8. detection method according to claim 7, which is characterized in that the syringe is common medical syringe, works as note
When emitter length is inadequate, connection medical infusion lines are used.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810937858.9A CN108956426B (en) | 2018-08-17 | 2018-08-17 | A kind of pervious concrete alkali soluble output detection method for simulating pore structure |
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| CN201810937858.9A CN108956426B (en) | 2018-08-17 | 2018-08-17 | A kind of pervious concrete alkali soluble output detection method for simulating pore structure |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202854133U (en) * | 2012-10-16 | 2013-04-03 | 浙江土工仪器制造有限公司 | Alkali-aggregate reaction measurer of concrete |
| US8619256B1 (en) * | 2012-09-14 | 2013-12-31 | Halliburton Energy Services, Inc. | Systems and methods for monitoring the properties of a fluid cement composition in a flow path |
| CN103983554A (en) * | 2014-05-29 | 2014-08-13 | 扬州大学 | Method for determining effective porosity of pervious concrete |
| CN104402390A (en) * | 2014-10-16 | 2015-03-11 | 河海大学 | Water permeability concrete barrier board and preparation method thereof |
| CN107857528A (en) * | 2017-11-03 | 2018-03-30 | 辽宁工程技术大学 | A kind of preparation method of the gangue aggregate without the porous concrete for plant growth of sand |
-
2018
- 2018-08-17 CN CN201810937858.9A patent/CN108956426B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8619256B1 (en) * | 2012-09-14 | 2013-12-31 | Halliburton Energy Services, Inc. | Systems and methods for monitoring the properties of a fluid cement composition in a flow path |
| CN202854133U (en) * | 2012-10-16 | 2013-04-03 | 浙江土工仪器制造有限公司 | Alkali-aggregate reaction measurer of concrete |
| CN103983554A (en) * | 2014-05-29 | 2014-08-13 | 扬州大学 | Method for determining effective porosity of pervious concrete |
| CN104402390A (en) * | 2014-10-16 | 2015-03-11 | 河海大学 | Water permeability concrete barrier board and preparation method thereof |
| CN107857528A (en) * | 2017-11-03 | 2018-03-30 | 辽宁工程技术大学 | A kind of preparation method of the gangue aggregate without the porous concrete for plant growth of sand |
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