CN103123330A - Method for testing asphalt anti-penetrability performance - Google Patents
Method for testing asphalt anti-penetrability performance Download PDFInfo
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- CN103123330A CN103123330A CN2012105562773A CN201210556277A CN103123330A CN 103123330 A CN103123330 A CN 103123330A CN 2012105562773 A CN2012105562773 A CN 2012105562773A CN 201210556277 A CN201210556277 A CN 201210556277A CN 103123330 A CN103123330 A CN 103123330A
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Abstract
The invention discloses a method for testing an asphalt anti-penetrability performance. The specific method carries out the following test on asphalt to be tested at regular time intervals T: utilizing an electrochemical workstation to test resistance Z and a phase angle of an asphalt film in a water solution under the conditions that the working voltage is +/-5mV and the working frequency f is [a,b]; drawing a logf-log/Z/ curve by taking logf as a horizontal ordinate and log/Z/ as a vertical coordinate; meanwhile, drawing a curve by taking the logf as the horizontal coordinate and the phase angle as the vertical coordinate; and when the curve has a trough and the logf-log/Z/ curve on the same horizontal coordinate section correspondingly has a platform, recording testing time alpha T corresponding to the curve and the logf-log/Z/ curve, wherein the longer the testing time alpha T is, the better anti-penetrability performance of the asphalt to be tested is. The method disclosed by the invention is used for testing the anti-penetrability performance of the asphalt by virtue of scientific and objective means; and a tested result is accurate and reliable, and the method is convenient to operate.
Description
Technical field
The invention belongs to pitch anti-permeability performance technical field, be specifically related to a kind of method of testing the pitch anti-permeability performance.
Background technology
Pitch is used widely in road engineering, but bituminous pavement is in long-term immersion situation, and moisture can infiltrate asphalt membrane and diffuse to pitch-aggregate Interface place, thereby asphalt membrane is peeled off from surface of aggregate, causes the asphaltic road-mix surface course structural failure; In addition, the moisture infiltration can cause the change of asphaltic nature, and pitch self cohesion is reduced, and then affects the water stability of asphaltic road-mix surface course.
At present, about the method for testing of pitch anti-permeability performance, provide the method for stability of asphalt mixture test to be the experiment of immersion Marshall and Immersion Wheel Truck Test in " highway engineering pitch and Asphalt Mixture Experiment rules " (JTG E20-2011).
Marshall Test wherein soaks, that the asphalt shaping test piece is immersed the Water Tank with Temp.-controlled certain hour, situation of change by degree of stability before and after the immersion of mensuration test specimen, estimate the water stability of asphalt, this test method to pitch and the susceptibility of gathering materials a little less than, and its test loads and mechanical meaning is indefinite, can't estimate accurately, really the water stability of asphalt.
Immersion Wheel Truck Test is at the actual traffic load of immersion condition Imitating, rut degree by test mixing material shaping test piece, estimate the water stability of asphalt, although the method is high than other method accuracy, the true water stability that can reflect to a certain extent asphalt, but the method complicated operation is loaded down with trivial details, and can't reflect infiltration and the dispersal behavior of moisture pitch from microcosmic angle.
Summary of the invention
One of purpose of the present invention is to provide the method for the test pitch anti-permeability performance of a kind of practicality and reliable test result.
For this reason, the method for test pitch anti-permeability performance provided by the invention is:
From pitch immerses in aqueous solution, every time T, pitch to be tested is carried out following test: at first utilize electrochemical workstation operating voltage for ± 5mV, frequency of operation f are [a, b] condition under, test impedance Z and the phasing degree of asphalt membrane in 0～70 ℃ of aqueous solution
Then utilize current test value: take logf as horizontal ordinate, log|Z| makes the logf-log|Z| curve as ordinate, simultaneously, take logf as horizontal ordinate, the phasing degree
For ordinate is done
Curve, wherein: 0＜T≤60min; A≤10
-2Hz, b 〉=10
4Hz;
When the data that record for certain time, in a horizontal ordinate section:
When curve trough and logf-log|Z| curve occurred and platform occurs, record should
Curve and the corresponding test duration α of logf-log|Z| curve T, the anti-permeability performance of the longer explanation of this test duration α T pitch to be tested is better.
Above-mentioned aqueous solution is (sodium chloride+sulfuric acid) aqueous solution, and the massfraction of its sodium chloride is 0～4.0%, and the amount of substance concentration of sulfuric acid is 0.5 * 10
-7～0.5 * 10
-3Mol/L.
Compared with prior art, the present invention has following characteristics:
(1) test the anti-permeability performance of pitch by the variation of monitoring pitch electrochemical properties in the aqueous solution soaking process, specifically by the electrochemical properties of electrochemical workstation test pitch in the aqueous solution soaking process that possesses the ac impedance measurement function, electrochemical parameter when being permeated fully by observation pitch, and the time of the electrochemical parameter of record when this pitch occurring and being permeated fully, estimate the quality of pitch anti-permeability performance with the length of this time;
(2) the complete simulating natural environment of the residing environment of test process medium pitch, the salinity of aqueous solution used, acidity and temperature all are close with acid rain.
To sum up, method of the present invention is tested the anti-permeability performance of pitch fully by science, objective means, and test result accurately and reliably.
Another object of the present invention is to provide a kind of working electrode of realizing said method, this working electrode comprises a circular or foursquare sheet metal, this sheet metal is provided with and is coated with the workplace that carries asphalt membrane and the insulating surfaces that is electrically connected to electrochemical workstation, described sheet thicknesses is 1.00～2.00mm, and the area of above-mentioned workplace is 100～400mm
2Be connected with the wire that realization is electrically connected to electrochemical workstation on above-mentioned insulating surfaces, and be coated with insulating material on this insulating surfaces.
Above-mentioned sheet metal is stainless steel substrates, steel disc or copper sheet.
The serviceability of combined with electrochemical workstation of the present invention and the pitch electric conductivity in selected aqueous solution is selected rational working electrode material and concrete size, and is more reliable to guarantee above-mentioned test method results.
When utilizing above-mentioned working electrode test pitch anti-permeability performance, contrast electrode used is mercurous chloride electrode, silver | silver chloride electrode or mercury | and mercuric oxide electrode, auxiliary electrode is platinum black electrode, graphite electrode or inert metal electrode, be coated with on the workplace of working electrode and be loaded with the thick asphalt membrane to be measured of 200～400 μ m, the operating voltage of electrochemical workstation is ± 5mV, frequency of operation f are [a, b], and a≤10
-2Hz, b 〉=10
4Hz is every time T (impedance Z and the phasing degree of the test of 0＜T≤60min) asphalt membrane to be measured
And utilize each test value, take logf as horizontal ordinate, log|Z| makes the logf-log|Z| curve as ordinate, simultaneously, take logf as horizontal ordinate, the phasing degree
For ordinate is done
Curve;
When the data that record for certain time, in a horizontal ordinate section:
Curve occur trough and
When platform appearred in the logf-log|Z| curve, record should
Curve and the corresponding test duration α of logf-log|Z| curve T, the anti-permeability performance of the longer explanation of this test duration α T pitch to be tested is better.
In when work, it on, the thickness of coating asphalt membrane has carried out choose reasonable to working electrode in the present invention, with the comparability of testing result between the objectivity that guarantees whole test method results and different pitches material.
Description of drawings
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Fig. 1 is the structural representation of working electrode of the present invention;
Fig. 2 be when in embodiment 1, asphalt membrane to be measured soaks beginning and soaks 1h, 3h, 5h the logf-log|Z| curve and
The combination stacking diagram of curve;
Fig. 3 be when in embodiment 1, asphalt membrane to be measured soaks 5.5h, 6h, 6.5h the logf-log|Z| curve and
The combination stacking diagram of curve.
Embodiment
When utilizing the electrochemical properties of electrochemical workstation test asphalt membrane in aqueous solution, due to the specific inductive capacity of the moisture specific inductive capacity much larger than pitch, infiltrate in the asphalt membrane process at moisture, along with the infiltration asphalt membrane resistance of moisture reduces gradually, resistance reduces trend and the depth of penetration of moisture, and to increase trend consistent; During to working electrode, the workplace of working electrode and the reaction of contact with moisture corrosion form the corrosion micro cell when moisture infiltrate asphalt membrane, at this moment,
Trough appears in curve, and the logf-log|Z| curve is also followed and platform occurred.
The present invention changes the Trends Sheet open fire by test asphalt membrane impedance spectrum figure before and after immersion and divides infiltration and dispersal behavior in asphalt membrane, and estimates the quality of its anti-permeability performance with the time length that asphalt membrane is permeated fully.Concrete grammar is: begin from pitch immersion aqueous solution, every time T, pitch to be tested is carried out following test: at first utilize electrochemical workstation operating voltage for ± 5mV, frequency of operation f are [a, b] condition under, test impedance Z and the phasing degree of asphalt membrane in 0～70 ℃ of aqueous solution
Then utilize current test value, take logf as horizontal ordinate, log|Z| makes the logf-log|Z| curve as ordinate, simultaneously, take logf as horizontal ordinate, the phasing degree
For ordinate is done
Curve, wherein: | Z|=Z '
2+ Z "
2, Z ' is the real part of impedance, Z " and be the imaginary part of impedance,
0＜T≤60min; A≤10
-2Hz, b 〉=10
4Hz.
When in a horizontal ordinate section,
Occur trough in curve, when platform occurring on the logf-log|Z| curve simultaneously, record should
Curve and the corresponding test duration α of logf-log|Z| curve T, this test duration, α T was longer, illustrated that the anti-permeability performance of pitch to be tested is better.
Above-mentioned aqueous solution is used for simulation pitch and uses on-the-spot water environment (as acid rain), is (sodium chloride+sulfuric acid) aqueous solution, and the massfraction of its sodium chloride is 0～4.0%, and the amount of substance concentration of sulfuric acid is 0.5 * 10
-7～0.5 * 10
-3Mol/L, namely salinity is that 0～4.0%, pH is 3～7.
In order better to realize said method, the inventor has designed a kind of working electrode of realizing said method simultaneously, as shown in Figure 1, this working electrode comprises a circular or foursquare smooth metal sheet 3, this sheet metal 3 is provided with and is coated with the workplace 6 that carries asphalt membrane and the insulating surfaces 5 that is electrically connected to electrochemical workstation, thick 1.00～the 2.00mm of this sheet metal 3, workplace 6 areas are 100～400mm
2Be coated with insulating material 2 on described insulating surfaces 5, and be connected with the wire 1 that is electrically connected to the electrochemical workstation realization on this insulating surfaces 5.Sheet metal 3 used is smooth stainless steel substrates, steel disc or copper sheet.And when utilizing this working electrode test pitch anti-permeability performance, be coated with the thick asphalt membrane 4 of 200～400 μ m on its workplace 6.
Below a kind of preparation process of the working electrode of the present invention that provides of inventor, so that the designed working electrode of the present invention is explained in detail:
1) metal sheet (stainless steel substrates, copper sheet or steel disc) is cut, is polished into smooth square or circular, for the ease of the accuracy of experiment test and result, its up and down base area be 100～400mm
2, thickness is 1.00～2.00mm;
2) use soldering in the one side (insulating surfaces) of described metal steel disc in wire (rubber insulated coppor wire), and wrap this face, sheet metal surrounding and the exposed copper cash of weld with insulating material (epoxy resin or acryl resin);
3) after insulating material solidified, the sheet metal of again polishing did not wrap the workplace that face namely applies asphalt membrane.
When using this working electrode test pitch anti-permeability performance, concrete operations are as follows:
With reference to shown in Figure 1, with (120 ~ 140 ℃) bitumen coated to be measured of heat on the workplace 6 of working electrode, the thick asphalt membrane to be measured 4 of cooling rear formation 200～400 μ m of room temperature;
With contrast electrode, auxiliary electrode and working electrode respectively with after electrochemical workstation is electrically connected to, again described contrast electrode, auxiliary electrode and working electrode are inserted in aqueous solution, make above-mentioned three kinds of electrodes consist of the closed-loop path, described contrast electrode can be selected mercurous chloride electrode, silver | silver chloride electrode and mercury | and mercuric oxide electrode, described auxiliary electrode can be selected platinum black electrode, graphite electrode and inert metal electrode, and the asphalt membrane on working electrode is over against auxiliary electrode;
The operating voltage of setting electrochemical workstation is ± 5mV, frequency of operation f are [a, b], and a≤10
-2Hz, b 〉=10
4Hz is every time T (impedance Z and the phasing degree of the test of 0＜T≤60min) asphalt membrane to be measured
And utilize each test value, take logf as horizontal ordinate, log|Z| makes the logf-log|Z| curve as ordinate, simultaneously, take logf as horizontal ordinate, the phasing degree
For ordinate is done
Curve;
When
Occur trough in curve, when platform occurring on the logf-log|Z| curve in identical horizontal ordinate section simultaneously, record should
The corresponding test duration α of curve T, this test duration, α T was longer, illustrated that the anti-permeability performance of pitch to be tested is better.
Below the embodiment that the inventor provides, so that technical scheme of the present invention is further explained explanation.
Embodiment 1:
This embodiment tests the anti-permeability performance of 70# petroleum bitumen (pen. (25 ℃, 5s, 100g) is 6.3mm, and softening point is 52.3 ℃, and 25 ℃ of ductilities are 142cm):
The 70# petroleum bitumen of heat is coated on the workplace of working electrode and forms after cooling the 300 thick asphalt membranes of μ m on workplace;
Contrast electrode, auxiliary electrode and working electrode respectively with after electrochemical workstation is electrically connected to, then are immersed described contrast electrode, auxiliary electrode and working electrode in aqueous solution, make above-mentioned three kinds of electrodes consist of the closed-loop path; Contrast electrode used is mercurous chloride electrode, and auxiliary electrode is platinum black electrode, and the asphalt membrane on working electrode is over against the auxiliary electrode platinized platinum; Aqueous temperature used is that 60 ℃, the massfraction of NaCl are 3.5%, H
2SO
4Amount of substance concentration be 0.5 * 10
-4(the NaCl+H of mol/L
2SO
4) aqueous solution;
The operating voltage of setting electrochemical workstation is ± 5mV, frequency of operation f are [10
-3, 10
6], every impedance Z and the phasing degree of time T=0.5h test asphalt membrane to be measured
And utilize each test value, do logf-log|Z| curve and
Curve map, choose and can embody pitch to be measured part relations figure of electrochemical properties variation tendency in aqueous solution and carry out following analysis:
In Fig. 2 and Fig. 3, horizontal ordinate logf is that the zone of [3,0] is that low frequency range, logf are that intermediate frequency zone, logf are high frequency region for the zone of [3,6] for the zone of [0,3]; In figure, logf-log|Z| curve low frequency range platform is corresponding | and the Z| value is that resistance value, the high frequency region platform of asphalt membrane is corresponding | and the Z| value is the resistance value of aqueous solution.
Fig. 2 be the logf-log|Z| curve and
The combination stacking diagram of curve, the AC impedance Bode that is asphalt membrane to be measured schemes; In this figure, curve i, curve ii, curve iii and curve iv are respectively the logf-log|Z| curve when soaking 0h, 1h, 3h and 5h, and curve i', curve ii ', curve iii ' and curve iv ' are respectively when soaking 0h, 1h, 3h and 5h
Curve.
By interpretation of result shown in Figure 2 as can be known: extend with soak time, logf-log|Z| curve low frequency range platform is acceleration and moves down trend, show that extending the asphalt membrane resistance value with soak time reduces, and it is increasing to reduce amplitude, namely moisture just begins to infiltrate asphalt membrane after asphalt membrane immerses aqueous solution, and depth of penetration is with the prolongation of soak time the increase trend of accelerating.
As shown in Figure 3, curve v', curve vi' and curve vii ' are respectively when soaking 5.5h, 6h and 6.5h
Curve, curve v, curve vi and curve vii are respectively the logf-log|Z| curve when soaking 5.5h, 6h and 6.5h.Soak as can be seen from Figure 3 afterwards all of 5.5h
Curve has trough to occur, and is corresponding
The logf-log|Z| curve is attended by platform and occurs, wherein: soak 5.5h's
Trough peace platform appears respectively in curve and logf-log|Z| curve in the zone that logf is [2.4,3.3], soak 6h's
Trough peace platform appears respectively in curve and logf-log|Z| curve in the zone that logf is [1.9,3.2], soak 6.5h's
Curve and logf-log|Z| curve are [1.7 at logf, 2.9] the zone trough peace platform appears respectively, after showing immersion 5.5h, moisture has diffused to asphalt membrane/steel disc at the interface, this shows when soaking 5.5h, the asphalt membrane subregion is permeated fully by moisture, and asphalt membrane begins to be peeled off by water from this moment;
By Fig. 3 also as can be known, continue to be with soak time prolongation logf-log|Z| curve low frequency range platform and accelerate to move down trend, be that the asphalt membrane resistance value also reduces continuing, thus as can be known in this section period asphalt membrane is being accelerated expansion by the moisture penetration zone extending with soak time.
To sum up analyze, the thick 70# petroleum bitumen film of 300 μ m is that 60 ℃, the massfraction of NaCl are 3.5%, H in temperature
2SO
4Amount of substance concentration be 0.5 * 10
-4(the NaCl+H of mol/L
2SO
4) soak in aqueous solution, moisture just begins to infiltrate in asphalt membrane after asphalt membrane immerses aqueous solution, and moisture depth of penetration in asphalt membrane is with the prolongation of soak time and accelerates increase trend, and moisture permeates asphalt membrane subregion spent time α T=5.5h fully.
Embodiment 2:
This embodiment tests the anti-permeability performance of following three kinds of pitches:
70# petroleum bitumen: pen. (25 ℃, 5s, 100g) is 6.3mm, and softening point is 52.3 ℃, and 25 ℃ of ductilities are 142cm;
90# petroleum bitumen: pen. (25 ℃, 5s, 100g) is 8.8mm, and softening point is 46.5 ℃, and 25 ℃ of ductilities are 160cm;
The SBR modified bitumen: pen. (25 ℃, 5s, 100g) is 7.5mm, and softening point is 49.8 ℃, and 25 ℃ of ductilities are 165cm;
This embodiment difference from Example 1 is, its test parameter is: pitch thickness 400 μ m, the aqueous solution when soaking are 70 ℃.
The various pitch anti-permeability performance of this embodiment test result is as follows:
70# petroleum bitumen: α T=5.5h;
90# petroleum bitumen: α T=6.0h;
SBR modified bitumen: α T=8.5h.
Can be found out by the above results, it is 5.5h and 6.0h that spent time is permeated fully by moisture in 70# petroleum bitumen film and 90# petroleum bitumen membrane portions zone, and namely above-mentioned two kinds of pitch anti-permeability performances are substantially suitable, and wherein 90# petroleum bitumen impermeability slightly well; In addition, it is 8.5h that required time is permeated fully by moisture in SBR modified bitumen membrane portions zone, obviously is longer than 70# petroleum bitumen and 90# petroleum bitumen, and namely SBR modified bitumen anti-permeability performance is best.
Claims (5)
1. a method of testing the pitch anti-permeability performance, is characterized in that, method is as follows:
From pitch immerses in aqueous solution, every time T, pitch to be tested is carried out following test: at first utilize electrochemical workstation operating voltage for ± 5mV, frequency of operation f are [a, b] condition under, test impedance Z and the phasing degree of asphalt membrane in 0～70 ℃ of aqueous solution
Then utilize current test value: take logf as horizontal ordinate, log|Z| makes the logf-log|Z| curve as ordinate, simultaneously, take logf as horizontal ordinate, the phasing degree
For ordinate is done
Curve, wherein: 0＜T≤60min; A≤10
-2Hz, b 〉=10
4Hz;
When the data that record for certain time, in a horizontal ordinate section:
When curve trough and logf-log|Z| curve occurred and platform occurs, record should
Curve and the corresponding test duration α of logf-log|Z| curve T, the anti-permeability performance of the longer explanation of this test duration α T pitch to be tested is better.
2. the method for test pitch anti-permeability performance as claimed in claim 1, is characterized in that, described aqueous solution is (sodium chloride+sulfuric acid) aqueous solution, and the massfraction of its sodium chloride is 0～4.0%, and the amount of substance concentration of sulfuric acid is 0.5 * 10
-7～0.5 * 10
-3Mol/L.
3. realize the working electrode of the described method of claim 1, it is characterized in that, this working electrode comprises a circular or foursquare sheet metal, this sheet metal is provided with and is coated with the workplace that carries asphalt membrane and the insulating surfaces that is electrically connected to electrochemical workstation, the thickness of described sheet metal is 1.00～2.00mm, and the area of described workplace is 100～400mm
2, be connected with wire on described insulating surfaces, be coated with insulating material on described insulating surfaces.
4. working electrode as claimed in claim 3, is characterized in that, described sheet metal is stainless steel substrates, steel disc or copper sheet.
5. utilize the method for the described working electrode test of claim 3 or 4 pitch anti-permeability performance, it is characterized in that, in method, contrast electrode used is mercurous chloride electrode, silver | silver chloride electrode or mercury | and mercuric oxide electrode, auxiliary electrode is platinum black electrode, graphite electrode or inert metal electrode, be coated with on the workplace of working electrode and be loaded with the thick asphalt membrane to be measured of 200～400 μ m, the operating voltage of electrochemical workstation is ± 5mV, frequency of operation f are [a, b], and a≤10
-2Hz, b 〉=10
4Hz is every time T (impedance Z and the phasing degree of the test of 0＜T≤60min) asphalt membrane to be measured
And utilize each test value, take logf as horizontal ordinate, log|Z| makes the logf-log|Z| curve as ordinate, simultaneously, take logf as horizontal ordinate, the phasing degree
For ordinate is done
Curve;
When the data that record for certain time, in a horizontal ordinate section:
When curve trough and logf-log|Z| curve occurred and platform occurs, record should
Curve and the corresponding test duration α of logf-log|Z| curve T, this test duration, α T was longer, illustrated that the anti-permeability performance of pitch to be tested is better.
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|---|---|---|---|
| CN201210556277.3A CN103123330B (en) | 2012-12-19 | 2012-12-19 | Method for testing asphalt anti-penetrability performance |
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| CN103900934A (en) * | 2013-12-05 | 2014-07-02 | 中国石油大学(华东) | Method for characterizing diffusion behavior of water in asphalt |
| CN106769746A (en) * | 2016-11-10 | 2017-05-31 | 广东电网有限责任公司电力科学研究院 | A kind of method of testing of silicon rubber water penetration |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900934A (en) * | 2013-12-05 | 2014-07-02 | 中国石油大学(华东) | Method for characterizing diffusion behavior of water in asphalt |
| CN103900934B (en) * | 2013-12-05 | 2016-09-21 | 中国石油大学(华东) | A kind of characterize water method of dispersal behavior in Colophonium |
| CN106769746A (en) * | 2016-11-10 | 2017-05-31 | 广东电网有限责任公司电力科学研究院 | A kind of method of testing of silicon rubber water penetration |
| CN106769746B (en) * | 2016-11-10 | 2019-11-08 | 广东电网有限责任公司电力科学研究院 | A kind of test method of silicon rubber water penetration |
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| Publication number | Publication date |
|---|---|
| CN103123330B (en) | 2014-08-13 |
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