CN103105320B - Preparation method and application of asphalt test piece - Google Patents
Preparation method and application of asphalt test piece Download PDFInfo
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- CN103105320B CN103105320B CN201110352374.6A CN201110352374A CN103105320B CN 103105320 B CN103105320 B CN 103105320B CN 201110352374 A CN201110352374 A CN 201110352374A CN 103105320 B CN103105320 B CN 103105320B
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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 the application in a kind of preparation method of asphalt test piece and property indication test method thereof, particularly relate 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, and because cement concrete water resistant and fire resistance are better, therefore, tunnel road surface is mated formation and still mainly adopted cement pavement so far.But the raising required along with road pavement ride quality, bituminous pavement that is smooth, wear-resisting, low noise replaces cement concrete pavement, and becomes the development trend of tunnel road surface gradually.But in the use procedure of tunnel sheet pavement, the fire that traffic hazard causes is the problem that must be noted that in tunnel sheet pavement use procedure.Traffic hazard occurs in tunnel causes bituminous pavement to catch fire, and because developing fire is swift and violent, personnel cannot evacuate in time and cause larger casualties, cause unnecessary loss to the country and people's lives and properties.
The burning of pitch is the physical and chemical process of a heat release, decomposition, first melting, drippage, trickling, then be bead burning, dripped by the bead burnt again, trickle, fire spreading is caused to expand, decomposite hydrogen, methane, benzene and alkane in burning through class inflammable gas, these burning of gas accelerate again the thermal decomposition of pitch further, thus the feature of pitch fire to be the oncoming force violent, expansion is fast, scope is wide, loss is large.Therefore, want the difficult burning problem solving pitch, first pitch not molten drop, problem of not trickling when being heated will be solved, can by improving melting point Sum decomposition temperature, increasing not firing composition or increasing the suppression composition in burner membrane (participating in the top layer pitch of burning) in decomposition gas, to improve its combustion limit oxygen index, reach and solve the difficult burning object of pitch.
So-called limited oxygen index, it is the scale weighing substance combustion complexity, and just refer under prescribed test conditions, material can just keep the minimum oxygen concentration needed for fired state in oxygen-nitrogen mixture body.
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.Oxygen concentration in air is 21%, when limited oxygen index <21% is inflammable material, and 21%
~27% is combustible material, and >27% is this material self-extinguish in fire.Specify in Japan JISK7201 standard: oxygen index >30% difficult combustion l level, 27% ~ 30% difficult combustion 2 grades, 24%
~27% difficult combustion 3 grades, 21%
~24% difficult combustion 4 grades, the difficult combustion of <21% 5 grades.
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.Also more to the research of Investigation of Asphalt Oxygen-index test Influential Factors, and emphasis to test specimen temperature, test specimen amount and burning time total gas couette etc. analyze and test, but due to the physical property that pitch is special, domestic unified method and the testing standard also not detecting its anti-flammability at present.Pitch is surveyed in formula process in fire resistance exists softening transform and phenomenon of easily trickling, and the technique thus making flame-retardant pitch test specimen is exactly a final steps, and the manufacture craft of sample is different, and measured result certainly exists difference.Current this area utilizes glass mat to make asphalt test piece and detects oxygen index, because when preparing pitch batten with glass mat, glass fibre is just played a supporting role, oxygen index is detected by the pitch that burns merely, the combustion process of pavement asphalt can not be embodied on the one hand well, survey in formula process on the other hand 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.
A kind of method of testing of flame retardant property of asphaltum is mentioned in CN101581711A; although this method can embody the combustion process of pavement asphalt; but; because 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 more meeting pitch when asphalt burns, embody the method for testing of pavement asphalt combustion process pitch earth fire resistance better, be applicable to the test of any road asphalt fire resistance, and not contamination analysis equipment.
The preparation method of asphalt test piece of the present invention comprises following process: by asphalt melting, the pitch of fusing mixes with filler and obtains asphalt, the weight ratio of pitch and filler is 1:1.5 ~ 1:2.4, in a mold asphalt is made the asphalt strip of long 80 ~ 200mm, then be wound around 60 ~ 300 object wire nettings at the outside surface of asphalt mixture strip, be asphalt test piece.
In asphalt test piece 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, and be preferably 3 ~ 10mm, thickness is generally 1 ~ 15mm, is preferably 2 ~ 10mm.Asphalt strip can adopt metal die to make.
In asphalt test piece of the present invention, wire netting is preferably 120 ~ 200 orders, and wire netting can be wound around 1 ~ 3 layer.
In asphalt test piece preparation method of the present invention, asphalt melting temperature is generally 140 ~ 155 DEG C, is 140 ~ 155 DEG C with the mixing temperature of filler.
Asphalt test piece of the present invention is used for oxygen limit index detection experiment.
Experiment asphalt test piece is made by method provided by the invention, technique is simple, production equipment requires low, be convenient to research, more meet the virtual condition of pitch during asphalt burning when testing Investigation of Asphalt Oxygen-index, the combustion process of various pavement asphalt can be embodied better.At the wire netting that asphalt test piece surface wrap is suitable, the pitch drippage after stain testing tool melted can be prevented, be conducive to the service efficiency improving instrument, reduce labour intensity, reduce the pollution (pitch of cleaning drippage needs to use a large amount of organic solvents) of working environment, do not affect again the concentration of the oxygen around test specimen simultaneously.Detect the Investigation of Asphalt Oxygen-index drawn according to the inventive method, can weigh truely and accurately and the fire resistance of reacting pitch, meanwhile, for the research and apply effect of bitumen flame-proof modifier provides Appreciation gist.
Embodiment
The concrete steps that asphalt test piece of the present invention is used for oxygen limit index detection experiment are as follows:
1. the preparation before test:
1.1 determine the oxygen concentration in air: according to the situation of lighting in atmosphere, determine the oxygen ranges in air;
The adjustment of 1.2 gas control equipments: regulate mixed gas and control flow, make the oxygen concentration that in mixed gas, oxygen concentration and step 1.1 are determined identical, and flow through combustion barrel with the speed of 40 ± 10mm/s, carry out the gas displacement of combustion barrel, displacement duration T 1 is for being greater than 30s, afterwards, mixed gas continues to flow through combustion barrel with the speed of 40 ± 10mm/s;
The arrangement of 1.3 test specimens: asphalt test piece bar is clipped on fixture, vertically be arranged on the center of combustion barrel, make pitch batten top lower than combustion barrel top at least 100mm, the expose portion lowest part of asphalt test piece is higher than burning base portion air distributing device top at least 100mm.
2. light asphalt test piece: take out one of them in one group of asphalt test piece, one deck 200 object wire netting is wound around in surface of test piece, be clipped on fixture according to step 1.3, adopt top to light method, first asphalt test piece is lighted with lighter, make flame contact asphalt test piece top and cover whole top end surface, flame interaction maximum duration is no more than 30s, removes lighter observe test specimen, after the complete inflammation of asphalt test piece top every about 5s, remove lighter, start timing.
3. observe fired state: after timing starts, the length that observation test specimen is burnt and burning behavior thereof;
If 3.1 in combustion, first burn-out, fires 1 ~ 2s is spontaneous again afterwards again, then continue to observe and timing;
If T3 burning time of 3.2 test specimens is less than 180s and burning length is not more than 50mm, then test successfully, record T burning time now
3with the oxygen concentration in combustion barrel, and be "○" reaction by this test data sheet, adopt afterwards and increase oxygen concentration repetition step 2,3 until one group of asphalt test piece test is complete;
If T3 burning time of 3.3 test specimens is greater than 180s or burning length is greater than 50mm, then test failure, stamps out the flames, and is "×" reaction by this test data sheet, reduces oxygen concentration afterwards and repeats step 2,3, until one group of asphalt test piece test is complete.
4. determine oxygen index: in step 2, when the burning behavior one of adjacent two asphalt test piece of record is "×" reaction, another is "○" reaction:
If 4.1 both oxygen concentration differences of selection are 0.5%, then determine that the oxygen concentration when asphalt test piece that "○" is reacted is burnt is oxygen index;
If 4.2 both oxygen concentration differences of selecting are 1%, then when the asphalt test piece burning of "×" reaction oxygen concentration basis on reduce by 1%, then repeat step 4.
Wherein, in step 2, flame interaction in the time T2 on asphalt test piece top be 0 ~ 30s, if can not asphalt test piece be lighted in T2, then remove lighter, increase the oxygen concentration in combustion barrel, repeat step 2 more afterwards, so repeatedly, until light asphalt test piece in T2.
Embodiment
Following Examples for raw material, take talcum powder as filler with matter crude oil 70# pitch in Saudi Arabia, according to the inventive method, and preparation test test specimen.
Embodiment 1: adopting the inventive method, is 1:0.5 by the weight ratio of pitch and filler, preparation test test specimen, surface of test piece is not wound around wire netting.
Embodiment 2: adopting the inventive method, is 1:1.0 by the weight ratio of pitch and filler, preparation test test specimen, surface of test piece is not wound around wire netting.
Embodiment 3: adopting the inventive method, is 1:1.5 by the weight ratio of pitch and filler, preparation test test specimen, surface of test piece 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, surface of test piece is wound around wire netting.
Embodiment 5: adopting the inventive method, is 1:2.4 by the weight ratio of pitch and filler, preparation test test specimen, surface of test piece 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, surface of test piece is wound around wire netting.
The pitch batten obtained in above-mentioned example is measured Investigation of Asphalt Oxygen-index according to the inventive method, and the data obtained is as following table 1.
The experimental phenomena of table 1 embodiment.
| sample ID | oxygen index, % | experimental phenomena |
| example 1 | - | pitch rapid melting during igniting, and bottom dripple to tester, severe contamination instrument, test cannot be carried out. |
| example 2 | - | pitch rapid melting during igniting, and bottom dripple to tester, severe contamination instrument, test cannot be carried out. |
| example 3 | 31 | during igniting, pitch melts gradually, and part drops onto bottom tester, and pollute instrument, 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 drops onto bottom tester, slight pollution instrument, and 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. |
As can be seen from above-mentioned data, asphalt test piece of the present invention is measuring the virtual condition of pitch when Investigation of Asphalt Oxygen-index more meets asphalt burning, and not contamination analysis equipment.
Claims (10)
1. the preparation method of an asphalt test piece, it is characterized in that comprising following process: by asphalt melting, the pitch of fusing mixes with filler and obtains asphalt, the weight ratio of pitch and filler is 1:1.5 ~ 1:2.4, in a mold asphalt is made the asphalt strip of long 80 ~ 200mm, then be wound around 60 ~ 300 object wire nettings at the outside surface of asphalt strip, be asphalt test piece.
2. in accordance with the method for claim 1, it is characterized in that: filler is breeze or talcum powder.
3. in accordance with the method for claim 1, it is characterized in that: the length of asphalt strip is 120 ~ 150mm.
4. according to the method described in 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 method described in claim 1 or 3, it is characterized in that: the width of asphalt strip is 3 ~ 10mm, and thickness is 2 ~ 10mm.
6. in accordance with the method for claim 1, it is characterized in that: 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 object wire nettings, wire netting is wound around 1 ~ 3 layer.
8. in accordance with the method for claim 1, it is characterized in that: asphalt melting temperature is 140 ~ 155 DEG C, the mixing temperature of pitch and filler is 140 ~ 155 DEG C.
9. the asphalt test piece that described in the arbitrary claim of claim 1 to 8, method obtains.
10. the asphalt test piece that described in the arbitrary claim of claim 1 to 8, method obtains is applied in oxygen limit index detection experiment.
Priority Applications (1)
| 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 CN103105320A (en) | 2013-05-15 |
| CN103105320B true CN103105320B (en) | 2015-07-22 |
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| 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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 |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|
| 材料氧指数的测试和影响因素;汪晓磊;《江苏建材》;20110630(第2期);参见论文第29页左栏第25-28行 * |
| 沥青氧指数测试方法;樊军等;《解放军理工大学学报》;20041231;第5卷(第6期);第30-32页 * |
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