CN102876055A - Sealant for pavement cracks - Google Patents
Sealant for pavement cracks Download PDFInfo
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- CN102876055A CN102876055A CN2011101932851A CN201110193285A CN102876055A CN 102876055 A CN102876055 A CN 102876055A CN 2011101932851 A CN2011101932851 A CN 2011101932851A CN 201110193285 A CN201110193285 A CN 201110193285A CN 102876055 A CN102876055 A CN 102876055A
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Abstract
The invention discloses a sealant for pavement cracks, characterized by compounding organo-bentonite with SBS modified asphalt to prepare the sealant. Results of studying the impact of the modifier and its amount on the high temperature performance and low temperature performance of the modified asphalt show that by adding organo-bentonite and the SBS composition, the high temperature composite modulus of the asphalt is raised, the temperature sensitivity is significantly weakened, thus the high temperature performance of the asphalt is improved; simultaneously the creep stiffness of the modified asphalt after aging is reduced, the creep rate is increased, the low temperature performance of the asphalt after aging is raised, and in the long-term use process, good fatigue cracking resistance is achieved.
Description
Affiliated technical field
The present invention is a kind of pavement maintenance material, is particularly useful for the gap-grouting material of bituminous pavement etc., is the modern technique in the pavement maintenance material.
Technical background
Development along with the transport by road cause, the construction of high-grade highway more and more is subject to the attention of various countries, modifying asphalt has significant effect with the cycle, thereby obtains rapid promotion and application raising pavement quality, prolongation road because of its good high-temperature stability and low temperature ductility.At present, during for sign modifying asphalt system, generally believe that conventional traditional methods such as using penetration degree, softening temperature can not embody the performance of modifying asphalt fully.Comparatively speaking, because the dynamic property of pitch more is applicable to predict the pavement performance of pitch, thereby has caused people's attention more near the viscoelastic behavior of material under working conditions.Modified-high polymer can increase the composite modulus of pitch, and (G ') and Young's modulus, this is the immanent cause figure that improves asphalt performance.Styrene-butadiene block copolymer (SBS) has now become the main additive of asphalt modification, and the adding of SBS utilizes the good physical and chemical performance of polymkeric substance to remedy the defective of pitch itself, increases the operating temperature range of bituminous material.The organobentonite aboundresources, low price is so strengthen and accelerate development and application tool to this cheap clay resource river that has very important significance.Coupling agent is known as " molecular bridge ", in order to improving the interface interaction between inorganics and the organism, thereby greatly improves material property.Composite usage under the silane coupling agent effect not only can reduce the cost of modifying asphalt effectively in asphalt modification organobentonite and SBS, and has greatly improved high temperature and the low-temperature performance of modifying asphalt.Investigated dynamic property of material under high temperature and the low-temperature creep performance of the modifying asphalt that adds people's organobentonite and SBS composition before and after aging according to U.S. SHRP (Strategie Highway Researeh Program) standard, and compared and add people's organobentonite and SBS composition to the impact of pitch SHRP performance classification.
Summary of the invention
The present invention is a kind of pavement crack seal gum, by the composite SBS modifying asphalt of organic Peng Run soil, has improved high temperature performance of asphalt, has improved the low-temperature performance of ageing of asphalt, and preferably antifatigue cracking performance is arranged.
The aging front and back high temperature of the composite SBS modifying asphalt of organobentonite and low-temperature dynamic mechanical property have been investigated properties-correcting agent and consumption thereof to the impact of modifying asphalt high temperature and low-temperature performance.The result shows, organobentonite and SBS composition add the high temperature composite modulus that the people has improved pitch, temperature sensitivity significantly weakens, so that high temperature performance of asphalt is improved; Reduced simultaneously the creep stiffness after modifying asphalt is aging, increased creep speed, improved the low-temperature performance after the ageing of asphalt, preferably antifatigue cracking performance has been arranged in the life-time service process.
(1) temperature sensitivity of matrix pitch is more remarkable, at high temperature close to viscous fluid.Organobentonite and SBS composition add the high temperature composite modulus that the people can significantly improve pitch, thereby reduced the temperature sensitivity of pitch.Bentonite adds the people and measures when being 2% best.
(2) because the high temperature composite modulus that bentonite adds after the people makes modifying asphalt aging is significantly higher than matrix pitch and SBS modifying asphalt, improved the ageing resistance of modifying asphalt.
(3) behind the excess pressure senile experiment, compare with the SBS modifying asphalt with matrix pitch, the modifying asphalt that adds people's organobentonite and SBS composition, in same load during the time, creep stiffness significantly decreases, creep speed significantly improves, low-temperature performance is improved, and preferably antifatigue cracking performance is arranged in the life-time service process.
Description of drawings
The content of Fig. 1 properties-correcting agent is on the impact of asphalt high-temperature dynamic properties
The content of Fig. 2 properties-correcting agent on RTFOT after the impact of asphalt high-temperature dynamic properties
Fig. 3 be the content of properties-correcting agent on PAV after the impact of pitch low-temperature dynamic mechanical property
(a) be modifying asphalt creep stiffness (s) (t) change curve in time in the time of-18 ℃
(b) be modifying asphalt creep speed (m) (t) change curve in time in the time of-18 ℃
■-matrix pitch wherein; ●-4%SBS modifying asphalt; ▲-4%SBS+1% organobentonite+1% coupling agent modified pitch;
The coupling agent modified pitch of-4%SBS+2% organobentonite+1%;
The coupling agent modified pitch of 4%SBS+2% organobentonite+1%; ◆ the coupling agent modified pitch of-4%SBS+3% organobentonite+1%.
Embodiment
1 experiment
1.1 raw material
SBS, the limited public affairs of Beijing yanshan petrochemical share ten days product, the trade mark is 4303, and is star-like, and relative molecular mass is about 350,000, and the massfraction of styrene block is 30%.Pitch, heavy traffic paving asphalt AH-90, Lanzhou oil refining head factory product, pin people degree 90 (0.1mm), 45 ℃ of softening temperatures, ductility is greater than 150cm.Organobentonite, 325 orders, Hua Lian, Tianjin Organic Chemical Plant product.Silane coupling agent, dawn chemical plant, Nanjing product.
1.2 sample preparation
To add a certain amount of SBS behind the asphalt heating to 170 ℃, at 170-190 ℃, the condition down cut 0.5-1h of 3000-5000r/min, namely do not added organic bentonitic sample.Add people's organobentonite and coupling agent in this sample, continue at the former down cut 0.5-1.sh that has ready conditions, namely obtain being added with the modifying asphalt sample of organobentonite and coupling agent.
1.3 performance test
The dynamic shear rheometer (CVO100) that the dynamic properties test adopts Britain BOHLIN company to produce, press ASTM D6373 standard testing, a small amount of pitch sample is placed on the lower plate of plate jig (diameter is 25mm), train wheel bridge is down to touches lower plate (spacing is 1mm), be 10r/S (near the frequency of doughnut road pavement applied load) in frequency, 64～76 ' test sample under the C high temperature.The ageing of asphalt instrument is rotary thin film in drying oven (RTFo) and the U.S. prentex Alloy FabricatorS that Belgium produces, Inc. the pressure ageing device (PAV) of producing, pitch situation after heat was mixed and stirred when the asphalt rotating thin-film oven test was used for construction simulation, press ASTM D2872 standard testing, pitch pressure weathering test is pressed ASTM D6521 standard testing, to the sample behind the rotary thin film in drying oven at 100 ℃, 2.1MPa place 20h under the condition, then remove pitch inner bubble that produces in weathering process with the heating under vacuum stove evacuation, be used for simulating the pavement asphalt situation after 10 years.The curved beam rheometer (BBR) that the low temperature rheologic behavior test adopts U.S. CANNON company to produce, press the ASTMD6648 standard testing, BBR mainly estimate two important parameter-creep stiffness (S) (measure pitch how to resist permanent load) and creep speed (m) (being determined at how the pitch creep changes under the permanent load) [s).Pitch sample after pressure is aging casts in the mould, scrapes off unnecessary sample behind the room temperature cooling 0.5h, the demoulding behind the continuation cooling 1h, and constant temperature 1h under target temperature is then to the pitch sample testing.
2 results and discussion
2.1 properties-correcting agent adds front and back to the impact of asphalt high-temperature dynamic properties
Asphaltic binder is a kind of viscoelastic material and thermoplastic cement ramming material, if pitch at high temperature has higher composite modulus (G
*) and low loss tangent be favourable to improving the pitch rutting resistance, G wherein
*=G '+G " (G ' be component of elasticity, G " be viscous components).Fig. 1 has provided composite modulus (G under matrix pitch, SBS modifying asphalt and organobentonite and the SBS composition modified asphalt high temperature
*) temperature variant curve.
As seen from Figure 1, matrix pitch at high temperature has lower composite modulus, improve at the composite modulus that adds people's organobentonite and SBS composition post-modification pitch a lot, and than the G of SBS modifying asphalt
*Also be greatly improved, particularly particularly outstanding when the bentonite add-on is 2%.The adding of this explanation organobentonite and SBS composition, so that the high temperature elasticity of modifying asphalt system further increases, temperature sensitivity also decreases, and has greatly improved the high-temperature behavior of modifying asphalt.This may be because under action of coupling agents, consistency and bonding force between organobentonite and SBS and the pitch have not only been strengthened, but also it is dispersed to have improved bentonite, so that SBS disperses very evenly in pitch, has formed the cause of the elastomeric network structure of chemically crosslinked.
2.2 properties-correcting agent adds front and back to the impact of dynamic property of material under high temperature after the ageing of asphalt
Wear out and refer to pitch in storage, transportation, construction and use procedure, owing to being exposed in the air for a long time, under the environmental factors effect, a series of volatilization, oxidation, polymerization can occur, and even the pitch internal structure changes.Usually be the pitch short ageing that comes by RTFOT in the hot mix process of construction simulation in the laboratory.Fig. 2 is matrix pitch, SBS modifying asphalt and organobentonite and SBS composition modified asphalt G behind RTFOT
*Temperature variant graphic representation.As seen from Figure 2, the G of pitch behind RTFOT
*Modifying asphalt than former state has increased a lot, this may be that weathering process can make pitch oxidation, the bituminous matter component concentration increases, relative molecular mass improves, the viscosity composition reduces, elastic component increases, thereby the deformability under the opposing high temperature improves greatly, and this variation increases along with the increase of digestion time.Simultaneously, because thermooxidizing in 150-185 ℃ temperature range, can occur in SBS, so that deterioration in physical properties, and organobentonite itself has good thermal stability, so the G of the organobentonite under the high temperature and SBS composition modified asphalt
*Also be greatly improved than SBS modifying asphalt, this explanation organobentonite and SBS composition modified asphalt still have preferably high-temperature behavior behind short ageing, improved the ageing resistance of modifying asphalt.
2.3 properties-correcting agent adds front and back to the impact of low-temperature dynamic mechanical property after the ageing of asphalt
The low-temperature ductility of pitch sample can reduce after rotary thin film in drying oven test and the pressure weathering test, makes at low temperatures flexibility decrease of pitch, and embrittlement easily occurs.U.S. SHRP standard adopts the curved beam rheometer to estimate the low-temperature performance of pitch, and Fig. 3 is matrix pitch, SBS modifying asphalt and organobentonite and SBS composition modified asphalt behind the PAV, under one 18 ℃ of constant temperature, S and the time dependent curve of m value.As seen from Figure 3, the creep stiffness of sample (S) in time prolongation and descend, simultaneously creep speed (m) prolongation is in time significantly risen, but the modifying asphalt that adds organobentonite and SBS composition, in identical load under the time, compare with the SBS modifying asphalt with matrix pitch, have lower S value and larger m value.This explanation organobentonite and SBS composition modified asphalt have very strong anti-permanent load ability and creep resistant deforming ability, and preferably antifatigue cracking performance is arranged under the low temperature.
Table 1 has been made the impact of properties-correcting agent on asphalt high-temperature and low-temperature performance classification according to the SHRP standard, can find out, organobentonite has improved 1-2 grade with the composite modified pitch of SBS than matrix pitch and SBS modifying asphalt high temperature grade, low-temperature performance than matrix pitch has improved 1 grade, shows that its high temperature rutting resistance and low temperature cracking resistance ability are significantly improved.
Claims (1)
1. a pavement crack with its principal character of seal gum is, the composite SBS modifying asphalt of organic Peng Run soil, and organic Peng Run soil add-on is 2%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101932851A CN102876055A (en) | 2011-07-12 | 2011-07-12 | Sealant for pavement cracks |
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| CN2011101932851A CN102876055A (en) | 2011-07-12 | 2011-07-12 | Sealant for pavement cracks |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982822A (en) * | 2018-08-06 | 2018-12-11 | 龙建路桥股份有限公司 | The equivalent simple aging testing method with RTFO or PAV aging effect |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020802A (en) * | 2007-03-23 | 2007-08-22 | 高书文 | SBS elastic waterproof paint and its prepn |
| CN101143967A (en) * | 2006-09-14 | 2008-03-19 | 湖南大学 | Inorganic nano particle and polymer composite modified emulsified asphalt |
| CN101275019A (en) * | 2007-03-30 | 2008-10-01 | 上海群康沥青科技有限公司 | Rubber asphalt |
-
2011
- 2011-07-12 CN CN2011101932851A patent/CN102876055A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101143967A (en) * | 2006-09-14 | 2008-03-19 | 湖南大学 | Inorganic nano particle and polymer composite modified emulsified asphalt |
| CN101020802A (en) * | 2007-03-23 | 2007-08-22 | 高书文 | SBS elastic waterproof paint and its prepn |
| CN101275019A (en) * | 2007-03-30 | 2008-10-01 | 上海群康沥青科技有限公司 | Rubber asphalt |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982822A (en) * | 2018-08-06 | 2018-12-11 | 龙建路桥股份有限公司 | The equivalent simple aging testing method with RTFO or PAV aging effect |
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Application publication date: 20130116 |