CN103105320A - Preparation method and application of asphalt test piece - Google Patents
Preparation method and application of asphalt test piece Download PDFInfo
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- CN103105320A CN103105320A CN2011103523746A CN201110352374A CN103105320A CN 103105320 A CN103105320 A CN 103105320A CN 2011103523746 A CN2011103523746 A CN 2011103523746A CN 201110352374 A CN201110352374 A CN 201110352374A CN 103105320 A CN103105320 A CN 103105320A
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Abstract
The invention relates to a preparation method and application of an asphalt test piece. The preparation method for the asphalt test piece comprises the following steps: fusing asphalt and uniformly mixing the fused asphalt and a filling material so as to obtain an asphalt mixture, wherein a weight ratio of the asphalt to the filling material is 1: 1.5 to 1: 2.4; preparing an asphalt mixture bar-shaped material with a length of 80 to 200 mm in a die from the asphalt mixture; and winding a 60-mesh to 300-mesh metal net on the external surface of the asphalt mixture bar-shaped material so as to obtain the asphalt test piece. The invention provides a testing method which better accords with an actual state of the asphalt during combustion of the asphalt mixture and better embodies flame retardation performance of albanite during combustion of pavement asphalt, and the asphalt test piece is applicable to testing of flame retardation performance of any road asphalt and does not pollute analytical equipment and a work environment.
Description
Technical field
The present invention relates to a kind of preparation method of pitch test specimen and the application in the property indication test method thereof, related in particular to a kind of method of testing of flame retardant property of asphaltum.
Background technology
Along with the development of China's highway, the quantity of vcehicular tunnel also constantly increases, due to the cement concrete water resistant and fire resistance better, therefore, tunnel road surface is mated formation and is still mainly adopted cement pavement so far.But along with the raising that the road pavement ride quality requires, bituminous pavement smooth, wear-resisting, low noise replaces cement concrete pavement, and becomes gradually the development trend of tunnel road surface.But in the use procedure of tunnel sheet pavement, the fire that traffic hazard causes is a problem that must be noted that in the tunnel sheet pavement use procedure.In the tunnel, accident causes that bituminous pavement catches fire, and swift and violent because of intensity of a fire development, personnel can't in time evacuate and cause larger casualties, and the country and people's lives and properties are caused unnecessary loss.
The burning of pitch is the physical and chemical process of a heat release, decomposition, at first melting, drippage, trickling, it is then the bead burning, bead by burning drips, trickles again, cause fire spreading to enlarge, decomposite hydrogen, methane, benzene and alkane in burning through the class inflammable gas, these burning of gas have further been accelerated again the thermal decomposition of pitch, so that the characteristics of pitch fire are the oncoming force is violent, expansion is fast, scope is wide, loss is large.Therefore, want to solve the difficult burning problem of pitch, at first to solve pitch not molten drop, problem of not trickling when being heated, can be by improving not firing composition or increasing inhibition composition in burner membrane (participating in the top layer pitch of burning) in pitch fusing point and decomposition temperature, increase decomposition gas, to improve its combustion limit oxygen index, reach the difficult burning purpose of solution pitch.
So-called limited oxygen index, it is the scale of weighing the substance combustion complexity, just refers to that material can just keep the required minimum oxygen concentration of fired state in the oxygen-nitrogen mixture body under the test condition of regulation.
In formula: OI is limited oxygen index;
[O
2]---the volumetric flow rate of oxygen in mixed gas during critical dissolved oxygen concentration;
[N
2]---the volumetric flow rate of nitrogen in mixed gas during critical dissolved oxygen concentration;
Limited oxygen index is higher, shows the more difficult combustion of material.Airborne oxygen concentration is 21%, when limited oxygen index＜21% is inflammable material, and 21%
～27% is combustible material,〉the 27%th, this material in fire from horizontal blanking.Stipulate in Japan JISK7201 standard: oxygen index 30% difficult combustion l level, 27%～30% 2 grades of difficult combustions, 24%
～27% 3 grades of difficult combustions, 21%
～24% 4 grades of difficult combustions,＜21% 5 grades of difficult combustions.
Along with the fast development of national economy, people also propose more and more higher requirement to the fire resistance of bituminous pavement, and the standard and statute of flame-retardant pitch is also more and more perfect.Research to Investigation of Asphalt Oxygen-index test Influential Factors is also more, and emphasis during to test specimen temperature, test specimen amount and burning total gas couette etc. analyze and test, but due to the special physical property of pitch, present domestic unified method and the testing standard that does not also detect its anti-flammability.Pitch is surveyed in fire resistance and is had softening transform and easy trickling phenomenon in the formula process, thereby the technique of making the flame-retardant pitch test specimen is exactly a key step, and the manufacture craft of sample is different, and measured result certainly exists difference.This area utilizes glass mat to make the pitch test specimen and detects oxygen index at present, because when preparing the pitch batten with glass mat, glass fibre is just played a supporting role, detect oxygen index by simple burning pitch, can not embody well the combustion process of pavement asphalt on the one hand, survey on the other hand in the formula process and can cause serious pollution to testing tool, bring very big inconvenience to test job.Glass mat is not suitable for the mensuration of the limited oxygen index of asphaltum with high viscosity simultaneously.
Mention a kind of method of testing of flame retardant property of asphaltum in CN101581711A; although this method can embody the combustion process of pavement asphalt; but; because the mineral aggregate addition is few; there is no safeguard measure; be not suitable for the fire resistance of test ordinary road pitch, severe contamination testing tool in test process.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of virtual condition that more meets asphalt when burning pitch, embody better the method for testing of pavement asphalt combustion process pitch earth fire resistance, be applicable to the test of any road asphalt fire resistance, and contamination analysis equipment not.
The preparation method of pitch test specimen of the present invention comprises following process: with asphalt melting, the pitch of fusing and filler mix and obtain asphalt, the weight ratio of pitch and filler is 1:1.5～1:2.4, asphalt is made the asphalt strip of long 80～200mm in mould, then the outside surface in the asphalt mixture strip is wound around 60～300 purpose wire nettings, is the pitch test specimen.
In pitch test specimen of the present invention, filler is breeze or talcum powder.The length of asphalt strip is preferably 120～150mm, and width is generally 2～20mm, is preferably 3～10mm, and thickness is generally 1～15mm, is preferably 2～10mm.The asphalt strip can adopt metal die to make.
In pitch test specimen of the present invention, wire netting is preferably 120～200 orders, and wire netting can be wound around 1～3 layer.
In pitch test material preparation method of the present invention, the asphalt melting temperature is generally 140～155 ℃, with the mixing temperature of filler be 140～155 ℃.
Pitch test specimen of the present invention is used for the oxygen limit index and detects test.
Make experiment pitch test specimen by method provided by the invention, technique is simple, production equipment requires low, be convenient to research, the virtual condition of pitch when test more meets the asphalt burning during Investigation of Asphalt Oxygen-index can embody the combustion process of various pavement asphalts better.At the suitable wire netting of pitch test specimen surface winding, can prevent that the pitch that melts from dripping the after stain testing tool, be conducive to improve the service efficiency of instrument, reduce labour intensity, reduce the pollution (pitch of cleaning drippage need to use a large amount of organic solvents) of working environment, do not affect again the concentration of test specimen oxygen on every side simultaneously.Detect the Investigation of Asphalt Oxygen-index draw according to the inventive method, can weigh truely and accurately and the fire resistance of reacting pitch, simultaneously, for research and the effect of bitumen flame-proof modifier provides the evaluation foundation.
Embodiment
The concrete steps that pitch test specimen of the present invention is used for oxygen limit index detection test are as follows:
1. the preparation before the test:
1.1 determine airborne oxygen concentration: according to the situation of lighting, determine airborne oxygen concentration scope in air;
1.2 the adjusting of gas control equipment: regulate mixed gas and control flow, make the oxygen concentration that in mixed gas, oxygen concentration and step 1.1 are determined identical, and with the speed of the 40 ± 10mm/s combustion barrel of flowing through, carry out the gas displacement of combustion barrel, displacement duration T 1 is greater than 30s, afterwards, mixed gas continues with the speed of the 40 ± 10mm/s combustion barrel of flowing through;
1.3 the arrangement of test specimen: pitch test specimen bar is clipped on fixture, vertically be arranged on the center of combustion barrel, make pitch batten top lower than combustion barrel top 100mm at least, the expose portion lowest part of pitch test specimen is higher than air distributing device top, burning bottom 100mm at least.
2. light the pitch test specimen: take out one of them in one group of pitch test specimen, at test specimen surface winding one deck 200 purpose wire nettings, be clipped on fixture according to step 1.3, adopt the top to light method, first the pitch test specimen is lighted with lighter, make flame contact pitch test specimen top and cover whole top end surface, the flame interaction maximum duration is no more than 30s, removes lighter and observe test specimen every about 5s, after the top complete inflammation of pitch test specimen, remove lighter, the beginning timing.
3. observation fired state: after timing begins, observe length and burning behavior thereof that test specimen is burnt;
If 3.1 in combustion process, first burn-out in 1～2s spontaneous combustion more again, continues to observe and timing afterwards;
3.2 if T3 burning time of test specimen is not more than 50mm less than 180s and burning length, success of the test, record T burning time at this moment
3With the oxygen concentration in combustion barrel, and be " zero " reaction with this test data sheet, adopt afterwards increase oxygen concentration repeating step 2,3 until one group of pitch specimen test is complete;
If 3.3 test specimen burning time T3 greater than 180s or burning length greater than 50mm, test failure, stamp out the flames, and be " * " reaction with this test data sheet, reduces afterwards oxygen concentration repeating step 2,3, until one group of pitch specimen test is complete.
4. determine oxygen index: in step 2, when one of the burning behavior of adjacent two pitch test specimens of record be " * " reaction, another is that " zero " reacts:
If 4.1 the oxygen concentration difference that both select is 0.5%, the oxygen concentration when the pitch test specimen of definite " zero " reaction burns is oxygen index;
4.2 if the oxygen concentration difference that both select is 1%, reduce by 1% on the basis of oxygen concentration when the pitch test specimen burning of " * " reaction, then repeating step 4.
Wherein, in step 2, flame interaction is 0～30s in the time T 2 on pitch test specimen top, if can not light the pitch test specimen in T2, remove lighter, increase the oxygen concentration in combustion barrel, repeating step 2 more afterwards, so repeatedly, until light the pitch test specimen in T2.
Embodiment
Following example in the Saudi Arabia matter crude oil 70# pitch as raw material, take talcum powder as filler, according to the inventive method, preparation test test specimen.
Embodiment 1: adopting the inventive method, is 1:0.5 by the weight ratio of pitch and filler, and test specimen is tested in preparation, and the test specimen surface is not wound around wire netting.
Embodiment 2: adopting the inventive method, is 1:1.0 by the weight ratio of pitch and filler, and test specimen is tested in preparation, and the test specimen surface is not wound around wire netting.
Embodiment 3: adopting the inventive method, is 1:1.5 by the weight ratio of pitch and filler, and test specimen is tested in preparation, and the test specimen surface is not wound around wire netting.
Embodiment 4: adopting the inventive method, is 1:1.5 by the weight ratio of pitch and filler, preparation test test specimen, test specimen surface winding wire netting.
Embodiment 5: adopting the inventive method, is 1:2.4 by the weight ratio of pitch and filler, and test specimen is tested in preparation, and the test specimen surface is not wound around wire netting.
Embodiment 6: adopting the inventive method, is 1:2.4 by the weight ratio of pitch and filler, preparation test test specimen, test specimen surface winding wire netting.
The pitch batten that obtains in above-mentioned example is measured Investigation of Asphalt Oxygen-index according to the inventive method, the data obtained such as following table 1.
The experimental phenomena of table 1 embodiment.
| The sample title | Oxygen index, % | Experimental phenomena |
| Example 1 | - | Pitch rapid melting during igniting, and dripple is to tester bottom, the severe contamination instrument, test can't be carried out. |
| Example 2 | - | Pitch rapid melting during igniting, and dripple is to tester bottom, the severe contamination instrument, test can't be carried out. |
| Example 3 | 31 | During igniting, pitch melts gradually, and part drops onto bottom tester, pollutes instrument, and test can be carried out. |
| Example 4 | 31 | During igniting, pitch melts gradually, does not drip, and does not pollute instrument, and test is normally carried out. |
| Example 5 | 31 | During igniting, pitch melts gradually, seldom drop onto bottom tester, and the slight pollution instrument, test can be carried out. |
| Example 6 | 31 | During igniting, pitch melts gradually, does not drip, and does not pollute instrument, and test is normally carried out. |
Can find out the virtual condition of pitch test specimen of the present invention pitch when measuring Investigation of Asphalt Oxygen-index and more meet the asphalt burning, and contamination analysis equipment not from above-mentioned data.
Claims (10)
1. the preparation method of a pitch test specimen, it is characterized in that comprising following process: with asphalt melting, the pitch of fusing and filler mix and obtain asphalt, the weight ratio of pitch and filler is 1:1.5～1:2.4, asphalt is made the asphalt strip of long 80～200mm in mould, then the outside surface in the asphalt mixture strip is wound around 60～300 purpose wire nettings, is the pitch test specimen.
2. it is characterized in that in accordance with the method for claim 1: filler is breeze or talcum powder.
3. it is characterized in that in accordance with the method for claim 1: the length of asphalt strip is 120～150mm.
4. according to the described method of claim 1 or 3, it is characterized in that: the width of asphalt strip is 2～20mm, and thickness is 1～15mm.
5. according to the described method of claim 1 or 3, it is characterized in that: the width of asphalt strip is 3～10mm, and thickness is 2～10mm.
6. it is characterized in that in accordance with the method for claim 1: the asphalt strip adopts metal die to make.
7. in accordance with the method for claim 1, it is characterized in that: wire netting is 120～200 purpose wire nettings, and wire netting is wound around 1～3 layer.
8. in accordance with the method for claim 1, it is characterized in that: the asphalt melting temperature is 140～155 ℃, and the mixing temperature of pitch and filler is 140～155 ℃.
9. the pitch test specimen that obtains of the described method of the arbitrary claim of claim 1 to 8.
10. the pitch test specimen that obtains of the described method of the arbitrary claim of claim 1 to 8 detects in test at the oxygen limit index and uses.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110352374.6A CN103105320B (en) | 2011-11-10 | 2011-11-10 | Preparation method and application of asphalt test piece |
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|---|---|---|---|
| CN201110352374.6A CN103105320B (en) | 2011-11-10 | 2011-11-10 | Preparation method and application of asphalt test piece |
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| CN103105320A true CN103105320A (en) | 2013-05-15 |
| CN103105320B CN103105320B (en) | 2015-07-22 |
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| CN201110352374.6A Active CN103105320B (en) | 2011-11-10 | 2011-11-10 | Preparation method and application of asphalt test piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486557A (en) * | 2015-12-21 | 2016-04-13 | 长安大学 | Asphalt test piece preparation method for oxygen index test |
| CN113009068A (en) * | 2021-03-02 | 2021-06-22 | 长安大学 | Test mold for asphalt limit oxygen index test and test method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH05340857A (en) * | 1992-06-05 | 1993-12-24 | Ishikawajima Harima Heavy Ind Co Ltd | Method for diagnosing deterioration of inservice metal material |
| JP2005030846A (en) * | 2003-07-10 | 2005-02-03 | Sumitomo Chem Co Ltd | Creep void detecting method |
| CN101581711A (en) * | 2008-05-13 | 2009-11-18 | 深圳市海川实业股份有限公司 | Method for testing flame retardant property of asphaltum |
| CN202018397U (en) * | 2011-04-28 | 2011-10-26 | 山西省交通科学研究院 | Die for producing sample for testing asphalt combustion performance |
-
2011
- 2011-11-10 CN CN201110352374.6A patent/CN103105320B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05340857A (en) * | 1992-06-05 | 1993-12-24 | Ishikawajima Harima Heavy Ind Co Ltd | Method for diagnosing deterioration of inservice metal material |
| JP2005030846A (en) * | 2003-07-10 | 2005-02-03 | Sumitomo Chem Co Ltd | Creep void detecting method |
| CN101581711A (en) * | 2008-05-13 | 2009-11-18 | 深圳市海川实业股份有限公司 | Method for testing flame retardant property of asphaltum |
| CN202018397U (en) * | 2011-04-28 | 2011-10-26 | 山西省交通科学研究院 | Die for producing sample for testing asphalt combustion performance |
Non-Patent Citations (2)
| Title |
|---|
| 樊军等: "沥青氧指数测试方法", 《解放军理工大学学报》 * |
| 汪晓磊: "材料氧指数的测试和影响因素", 《江苏建材》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486557A (en) * | 2015-12-21 | 2016-04-13 | 长安大学 | Asphalt test piece preparation method for oxygen index test |
| CN113009068A (en) * | 2021-03-02 | 2021-06-22 | 长安大学 | Test mold for asphalt limit oxygen index test and test method thereof |
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| Publication number | Publication date |
|---|---|
| CN103105320B (en) | 2015-07-22 |
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