CN108387614A - A kind of regenerated aggregate concrete interfacial transition zone transport property test method - Google Patents
A kind of regenerated aggregate concrete interfacial transition zone transport property test method Download PDFInfo
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- CN108387614A CN108387614A CN201711469584.7A CN201711469584A CN108387614A CN 108387614 A CN108387614 A CN 108387614A CN 201711469584 A CN201711469584 A CN 201711469584A CN 108387614 A CN108387614 A CN 108387614A
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- mortar
- transition zone
- recycled aggregate
- transport property
- metal needle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
Abstract
The invention discloses a kind of regenerated aggregate concrete interfacial transition zone transport property test methods, belong to material tests field, it is included in the recycled aggregate placed and be sized in die trial, it is identical using the metal needle electrode and spacing of electric silica gel stickup certain amount in its side surface, with after-pouring mortar vibration compacting, number and spacing metal needle electrode same as described above are inserted into the middle part of mortar.After the completion of maintenance, two interelectrode resistance adjacent around recycled aggregate and in the middle part of mortar are gradually tested respectively, take its average value.Test block is then molded using above-mentioned mortar, its transport coefficient is detected, the transport coefficient of recycled aggregate interfacial transition zone is calculated eventually by formula.The present invention can be used for detecting the transport property of mortar and recycled aggregate interfacial transition zone, and test philosophy is simple, as a result reliably.
Description
Technical field
The present invention relates to a kind of test method, specifically a kind of regenerated aggregate concrete interfacial transition zone transport property
Test method belongs to measuring for materials field.
Background technology
Current China is carrying out large-scale infrastructure construction, and the dismounting of old structure and the construction of new construction are parallel.
On the one hand, the dismounting of old structure produces a large amount of building waste, including a large amount of concrete debris, and accumulation and disposition need
Big quantity space is occupied, and easily air and water are polluted；On the other hand, the construction of new construction needs a large amount of sandstone aggregate,
Since its dosage is very big, there is the situation of sandstone aggregate insufficient supply in many areas.So being carried out again to concrete debris
It makes profits use, there is obvious active demand.But not only corner angle are more for recycled aggregate, and normal conditions lower surface can all have
Remaining old sand slurry covering, causes the interfacial transition zone of new mortar and recycled aggregate more weak, hole is more, is conducive to the external world
The harmful substances such as chlorion and carbon dioxide, which are transported into inside configuration by the modes such as spreading, permeate, causes durability to decline, because
This is particularly significant for mortar and recycled aggregate interfacial transition zone transport property Quality Research.
In addition, in existing transport property test method, NEL methods are that one kind that Tsinghua University professor Lu Xinying proposes is fast
The method of speed evaluation concrete permeability resistance, refers to Chinese invention patent CN97120246.X, is adopted as China professional standard JC/
T 1086；RCM methods are quick chloride ion transport Y-factor method Y, are used for European standard, and standard number is NT BUILD 492,
Standard GB/T/T50082 and some professional standards are absorbed as by China, such as JTG/T B07-01-2006；ASTM C1202 are
Common electric flux method, is American National Standard, is also absorbed as China's standard GB/T/T50082 and China's professional standard
JTJ275.These methods are the transport property test methods suitable for entire concrete test block.
By searching for related data, the detection for mortar and recycled aggregate interfacial transition zone transport property at present is found,
The big X-ray diffraction and SEM scanning electron microscope etc. of mostly using carries out qualitative analysis, not yet finds mortar and recycled aggregate interfacial transition zone
Transport property quantitative analysis method.
Invention content
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of regenerated aggregate concrete interface mistakes
Area's transport property test method is crossed, the transport coefficient progress to resistance and pure mortar specimen respectively to metal needle electrode is passed through
It measures, analyzes detected data, quantitative calculating is carried out to interfacial transition zone transport coefficient.
In order to solve the above-mentioned technical problem, present invention employs following technical solutions：
A kind of regenerated aggregate concrete interfacial transition zone transport property test method, includes the following steps：
Step 1：Recycled aggregate is processed into cuboid, welt is placed in cube die trial；
Step 2：In the side surface of recycled aggregate, electric silica gel, which bonds 4-8 roots, has equidistant metal needle electrode；
Wherein, metal needle electrode can securely be connect perpendicular to the top surface of recycled aggregate, exposed parts with test fixture；
Step 3：It is 0.35-0.45 by molding water-cement ratio, cement mortar rate is the mortar of 0.5-0.8, and it is remaining to be cast in die trial
In space, and vibration compacting；
Step 4：In the top surface of mortar, metal needle electrode, the number of metal needle electrode are equally inserted into along its center line
Amount, spacing and the depth of insertion are identical as the metal needle electrode on recycled aggregate；
Step 5：The test block that step 4 is formed is placed in saturation Ca (OH)2It is taken out after being conserved 28 days in solution, dries surface
Moisture, the resistance of adjacent two metal needle electrodes on successive test recycled aggregate, mortar top surface take its average value to be respectively
R1、R2；
Step 6：Test block is molded with the mortar that step 5 is formed again, according to existing transport property test method, measures mortar
It is molded the transport coefficient D of test block1, and pass through the transport coefficient of formula calculating interfacial transition zone as follows：
Further, existing transport property test method is NEL methods, RCM methods, ASTM C1202 methods.
Further, the step 1 is high specifically, recycled aggregate is processed into length of side a=5-10cm, thickness b=a/2
Degree is the cuboid of (a+0.1) cm, and welt is placed in the cube die trial that the length of side is (a+0.1) cm.
Further, in step 2, a diameter of 0.1-0.5mm of metal needle electrode, a length of 20-40mm, center spacing
5-10mm。
Compared with the existing technology, the present invention has the following technical effect that：
1. this method can carry out mortar-recycled aggregate interfacial transition zone transport property quantitative detection.
2. this method test operation is easy, equipment requirement is relatively low.
Description of the drawings
Fig. 1 is the metal needle electrode schematic diagram of recycled aggregate mortar specimen.
Specific implementation mode
The specific implementation mode of the present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of regenerated aggregate concrete interfacial transition zone transport property test method of the present invention, including such as
Lower step：
Step 1：Recycled aggregate 1 is processed into length of side a=5-10cm, thickness b=a/2, the highly length for (a+0.1) cm
Cube, welt are placed in the cube die trial that the length of side is (a+0.1) cm；
Step 2：In the side surface of recycled aggregate 1, electric silica gel, which bonds 4-8 roots, has equidistant metal needle electrode
2, a diameter of 0.1-0.5mm of metal needle electrode 2, a length of 20-40mm, center spacing 5-10mm.Wherein, metal needle electrode
2 can securely connect perpendicular to the top surface of recycled aggregate (1), exposed parts with test fixture；
Step 3：It is 0.35-0.45 by molding water-cement ratio, cement mortar rate is the mortar of 0.5-0.8, and it is remaining to be cast in die trial
In space, and vibration compacting；
Step 4：In the top surface of mortar, metal needle electrode 2, the number of metal needle electrode 2 are equally inserted into along its center line
Amount, spacing and the depth of insertion are identical as the metal needle electrode 2 on recycled aggregate；
Step 5：The test block that step 4 is formed is placed in saturation Ca (OH)2It is taken out after being conserved 28 days in solution, dries surface
Moisture, the resistance of adjacent two metal needle electrodes 2 on successive test recycled aggregate, mortar top surface take its average value to be respectively
R1、R2；
Step 6：Test block is molded with the mortar that step 5 is formed again, according to existing transport property test method, as NEL methods,
(it are the prior art) such as RCM methods, ASTM C1202 methods measures the transport coefficient D of mortar molding test block1, and by as follows
Shown in formula (1) calculate interfacial transition zone transport coefficient：
Above-described embodiment, which is intended merely to become apparent from, illustrates that technical scheme of the present invention made enumerates, not to the present invention's
It limits, those skilled in the art are according to the common knowledge of this field to the accommodation of technical scheme also in this Shen
Please be within protection domain, in short, above-described embodiment is only to enumerate, the protection domain of the application is with scope
It is accurate.
Claims (4)
1. a kind of regenerated aggregate concrete interfacial transition zone transport property test method, it is characterised in that：Include the following steps：
Step 1：Recycled aggregate (1) is processed into cuboid, welt is placed in cube die trial；
Step 2：In the side surface of recycled aggregate (1), electric silica gel, which bonds 4-8 roots, has equidistant metal needle electrode
(2)；Wherein, metal needle electrode (2) can securely connect perpendicular to the top surface of recycled aggregate (1), exposed parts with test fixture
It connects；
Step 3：It is 0.35-0.45 by molding water-cement ratio, cement mortar rate is the mortar of 0.5-0.8, is cast in the remaining space of die trial
In the middle, and vibration compacting；
Step 4：In the top surface of mortar, metal needle electrode (2), the number of metal needle electrode (2) are equally inserted into along its center line
Amount, spacing and the depth of insertion are identical as metal needle electrode (2) on recycled aggregate；
Step 5：The test block that step 4 is formed is placed in saturation Ca (OH)2It is taken out after being conserved 28 days in solution, dries surface moisture,
The resistance of adjacent two metal needle electrodes (2) on successive test recycled aggregate, mortar top surface, it is respectively R to take its average value1、
R2；
Step 6：Test block is molded with the mortar that step 5 is formed again, according to existing transport property test method, measures mortar molding
The transport coefficient D of test block1, and pass through the transport coefficient of formula (1) calculating interfacial transition zone as follows：
2. a kind of regenerated aggregate concrete interfacial transition zone transport property test method according to claim 1, feature
It is：Existing transport property test method is NEL methods, RCM methods, ASTM C1202 methods.
3. a kind of regenerated aggregate concrete interfacial transition zone transport property test method according to claim 1, feature
It is：The step 1 is highly (a+ specifically, recycled aggregate (1) is processed into length of side a=5-10cm, thickness b=a/2
0.1) cuboid of cm, welt are placed in the cube die trial that the length of side is (a+0.1) cm.
4. a kind of regenerated aggregate concrete interfacial transition zone transport property test method according to claim 1, feature
It is：In step 2, a diameter of 0.1-0.5mm of metal needle electrode (2), a length of 20-40mm, center spacing 5-10mm.
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| CN201711469584.7A CN108387614B (en) | 2017-12-29 | 2017-12-29 | Method for testing transport property of recycled aggregate concrete interface transition zone |
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| CN201711469584.7A CN108387614B (en) | 2017-12-29 | 2017-12-29 | Method for testing transport property of recycled aggregate concrete interface transition zone |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226745A (en) * | 2011-04-07 | 2011-10-26 | 河海大学 | Method and device for testing dynamic shear properties of aggregate-mortar transition region |
| US20120295805A1 (en) * | 2011-05-18 | 2012-11-22 | Polytechnic Institute Of New York University | Solid phase methods for thermodynamic and kinetic quantification of interactions between nucleic acids and small molecules |
| CN105424578A (en) * | 2015-12-01 | 2016-03-23 | 浙江工业大学 | Method for measuring communicating porosity of concrete by using non-contact impedance method and testing device |
| CN107505357A (en) * | 2017-08-07 | 2017-12-22 | 石家庄铁道大学 | A kind of alkali-aggregate reaction Tachistoscope method and test device |
-
2017
- 2017-12-29 CN CN201711469584.7A patent/CN108387614B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226745A (en) * | 2011-04-07 | 2011-10-26 | 河海大学 | Method and device for testing dynamic shear properties of aggregate-mortar transition region |
| US20120295805A1 (en) * | 2011-05-18 | 2012-11-22 | Polytechnic Institute Of New York University | Solid phase methods for thermodynamic and kinetic quantification of interactions between nucleic acids and small molecules |
| CN105424578A (en) * | 2015-12-01 | 2016-03-23 | 浙江工业大学 | Method for measuring communicating porosity of concrete by using non-contact impedance method and testing device |
| CN107505357A (en) * | 2017-08-07 | 2017-12-22 | 石家庄铁道大学 | A kind of alkali-aggregate reaction Tachistoscope method and test device |
Non-Patent Citations (1)
| Title |
|---|
| LIPENG WU等: "Determination of the Transport Properties of Structural Concrete Using AC Impedance Spectroscopy Techniques", 《JOURNAL OF ENGINEERING》 * |
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