CN105585271A - Additive for improving water stability of asphalt mixture and application method thereof - Google Patents
Additive for improving water stability of asphalt mixture and application method thereof Download PDFInfo
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- CN105585271A CN105585271A CN201410563754.8A CN201410563754A CN105585271A CN 105585271 A CN105585271 A CN 105585271A CN 201410563754 A CN201410563754 A CN 201410563754A CN 105585271 A CN105585271 A CN 105585271A
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Abstract
The invention discloses an additive for improving water stability of an asphalt mixture and an application method thereof. The additive is a composition of urea and stearic acid metal salt and includes, on the basis of the weight of the mixture, 30-95% of the urea and the balanced being the stearic acid metal salt. The application method includes the following steps (1) adding the additive for improving the water stability of the asphalt mixture to asphalt, mixing the mixture uniformly, and blending the mixture with aggregate in a blender to prepare the asphalt mixture; or (2) feeding the additive with the asphalt and the aggregate together into the blender to prepare the asphalt mixture, wherein the additive accounts for 0.2-3.0% of the asphalt. The additive, compared with a conventional amine anti-stripping agent, the additive is good in anti-stripping effect, is low in cost, can be supplied sufficiently and is convenient to use.
Description
Technical field
The present invention relates to a kind of additive and application thereof that improves performance of asphalt mixture, particularly relate to a kind of additive and application thereof that improves stability of asphalt mixture, especially improve additive and the application thereof of asphalt immersion Marshall residual stability and freeze thawing splitting parameter.
Background technology
Hot-mix asphalt mixture is mineral aggregate and the composite material of breeze after heating is mixed and stirred of pitch and certain grating, is mainly used in building bituminous paving. Be 10 ~ 15 years the projected life of general asphaltic road-mix surface course. But due to the water stability deficiency of asphalt, earlier period damage appears to a lot of bituminous pavings of China in (even in 1 ~ 3 year) using in several years, as hole groove, the disease such as loose, this has become one of principal mode that China's asphalt pavement of highway destroys. Therefore, the water stability of compound directly affects the service life of bituminous paving.
So-called Water Damage on Asphalt Pavement, it is stability of asphalt mixture deficiency, refer to the hole of water via asphalt surface, crack, enter bituminous paving inside, under the repeated action that the water pressure producing at wheel tyre dynamic loads and vacuum draw wash away, moisture penetrates into pitch and mineral aggregate two-phase interface or pitch inside gradually, adhesiveness between pitch and mineral aggregate is reduced, and lose gradually cementitiousness, asphalt membrane is separated even completely from mineral aggregate sur-face peeling gradually, make asphalt occur falling grain, the phenomenon such as loose, finally cause the globality of bituminous paving to destroy.
At present, Evaluation in Water Damage of Asphalt Mixture can roughly be divided into two classes. One class is water-boiling method, loose asphalt compound without compacting is dipped in water to (normal temperature or boiling water) after a period of time, to wrap the attached rate of wrapping up in of asphalt membrane or the degree of peeling off gathering materials of subjectivity as distinguishing rule, evaluate the water stability of compound, the method is subjectivity evaluation method. Another kind of evaluation method is, bitumen mixture specimen is placed under certain water erosion environmental condition, characterizes the water stability of compound with the decay degree of some mechanics index of physics, and these tests comprise immersion Marshall Test, diametral compression test. The present invention adopts Marshall Test, diametral compression test, and water stability and the additive of evaluating compound with this affect stability of asphalt mixture.
According to JTJ052 " highway engineering pitch and Asphalt Mixture Experiment code " regulation, the water stability of asphalt requires to see the following form 1.
Table 1 stability of asphalt mixture technical indicator
Add antistripping agent to be considered to improve a kind of main method of compound water stability energy. Using comparatively general antistripping agent is at present all some amines or amides compound, and document and the patent of this class asphalt antistripping agent are all a lot.
As CN200810044903.4 discloses a kind of road surface strengthening agent, wherein taking Carlow amine or AR-78 as antistripping agent. The price of amine or amide-type development of anti stripping agent for asphalt is high, mostly at 2 ~ 30,000 yuan/ton, and most liquid or paste, generally mix with pitch in asphalt production factory or pitch storage and transport station, form containing the pitch of antistripping agent, and then transport asphalt batching plant to, mix and stir production compound with gathering materials. The drawback using is like this, this class antistripping agent needs under the long-time condition of high temperature and bituminous pitch storing, transport, thereby easily produces degraded, affects its antistripping effect.
Except development of anti stripping agent for asphalt, some modified pitch, scrap rubber and waste plastics composite modified asphalt that the diatomite modified asphalt relating to as CN011108700.5 and CN10346039A relate to, mainly be to improve the high and low temperature performance of pitch and compound thereof, also the tool effect of stability of asphalt mixture that has some improvement. If by above-mentioned modified pitch for improving the water stability of compound, exist that complex process, modifier consumption are large, the unsurmountable drawback of high in cost of production.
Summary of the invention
For overcoming weak point of the prior art; the object of the present invention is to provide a kind of additive of suitable raising stability of asphalt mixture; the additive that is characterized in the present invention is solid particle or powder at normal temperatures; be easy to use; especially be suitable for directly adding together with gathering materials with pitch in asphalt batching plant in mixing apparatus, this complete with gather materials and bituminous cements mix and stir.
One aspect of the present invention is to provide that a kind of described additive is urea composition for improving the additive of stability of asphalt mixture, is the mixture of urea and stearate. In mixture quality, urea accounts for 30% ~ 95%, and preferably 50% ~ 80%, the rest is stearate. Stearate of the present invention is univalent metal salt, comprises stearic potassium, lithium, sodium salt, and particular certain cancers and/or divalent metal salt comprise stearic calcium, magnesium, zinc salt, preferred calcium salt.
The present invention provides a kind of simultaneously and has comprised: add described additive in pitch to (1) for improving the application process of additive of stability of asphalt mixture, then together with gathering materials in mixing equipment mix; Or (2) by above-mentioned additive with pitch, add mixing apparatus together with gathering materials, prepare asphalt. The wherein addition of additive, in asphalt quality, is 0.2% ~ 3.0%.
In compound is produced, different trade mark pitch needs the different temperature of mixing and stirring. Temperature under its (0.17 ± 0.02) Pa.s viscosity of asphalt mixing temperature, asks for according to the viscosity-temperature curve of pitch. According to code requirement, the working condition scope of asphalt is in table 2.
The production temperature of table 2 hot-mix asphalt mixture (DEG C)
The present invention is to provide a kind of asphalt on the other hand, wherein contain aforementioned for improving the additive of stability of asphalt mixture, in asphalt quality percentage, 0.2% ~ 3.0%, preferably 0.6% ~ 2.0%.
Asphalt provided by the invention,,, also comprises with compound weighing scale for improving the additive of water stability except above: the gathering materials of pitch and surplus, its medium pitch is 3 ~ 10% with the mass ratio gathering materials, and is preferably 5%.
What the present invention was used gathers materials is one or more during limestone, basalt, andesite, granite gather materials.
The preparation method of asphalt of the present invention, comprise: in advance by stirred tank, gather materials, asphalt heating to 130～165 are DEG C for subsequent use, first will gather materials and be added to compound mixing machine, in pitch, add additive of the present invention again, again the pitch that contains additive is joined in mixing machine, stir, obtain asphalt of the present invention. Or, above-mentioned additive with pitch after preheating, add mixing apparatus together with gathering materials, is prepared to asphalt.
Water stability of the present invention refers to the asphalt immersion residual degree of Marshall Test and freeze thawing diametral compression test retained strength ratio, and its value is larger, and the water stability of compound better.
The present invention gathers materials, Asphalt Mixture Experiment is according to " highway engineering gather materials testing regulations " (JTJ058-2000), " highway engineering pitch and Asphalt Mixture Experiment code " (JTJ052-2000). Test mixture of the present invention adopts American MTS material test system, and other test adopts and meets the testing equipment that national standard requires.
Urea composition additive of the present invention can significantly improve immersion Marshall residual stability and the freeze thawing diametral compression test strength ratio of asphalt, obviously improves the water stability of asphalt, will contribute to solve road surface early damage problem.
Detailed description of the invention
Further illustrate the present invention program and effect below in conjunction with embodiment. The percentage of giving in the present invention is mass fraction. Should be appreciated that protection scope of the present invention is not subject to the restriction of detailed description of the invention.
What specific embodiment of the invention Asphalt Mixture used gathers materials for basalt, and grating is selected AC-16 I type intermediate value, and bitumen aggregate ratio is 5.0%. Gather materials apparent density in table 3.
Table 3 the present invention apparent density of gathering materials used
The pitch that the present invention uses is taken from the 70A pitch of Sinopec Xi'an petrochemical industry branch company, and its character is in table 4.
Table 4 asphaltic nature
Urea used in the present invention, purchased from Liaoning Hua Jin Chemical Group, meets agricultural urea standard.
Odium stearate used in the present invention is that Xin Wei auxiliary agent Co., Ltd of Gaomi City produces, and calcium stearate is Jiangxi Hongyuan Chemical Co., Ltd.'s product.
Embodiment 1
Get listed earlier gathering materials and pitch, first pitch is preheated to 140 DEG C. According to first gather materials (grating is in table 2), the addition sequence of pitch (character is in table 4), urea composition again, add material to compound mixing machine, pitch is 5.0% with the weight ratio of gathering materials. Urea composition is the mass fraction that 0.8%(accounts for pitch), wherein, urea accounts for 70%, and odium stearate and calcium stearate account for respectively 15%. Prepare bitumen mixture specimen and carry out correlation test, measure the immersion residual degree of Marshall Test and freeze thawing diametral compression test retained strength ratio. Concrete outcome is referring to table 5.
Embodiment 2
Specific implementation method is with embodiment 1. Urea composition is 1.0%, and wherein urea accounts for 60%, and odium stearate 40% does not add calcium stearate.
Embodiment 3
Specific implementation method is with embodiment 1. Urea composition is 1.2%, and wherein urea accounts for 75%, and calcium stearate 25% does not add odium stearate.
Embodiment 4
Specific implementation method is with embodiment 1. Urea composition is 2.2%, and wherein urea accounts for 65%, calcium stearate 25%, odium stearate 10%.
Comparative example 1
Specific implementation method is with embodiment 1. Do not add urea composition.
Comparative example 2
Specific implementation method is with embodiment 1. Do not add urea composition, only add 1.5% odium stearate.
Comparative example 3
Specific implementation method is with embodiment 1. Do not add urea composition, only add 1.5% calcium stearate.
Comparative example 4
Specific implementation method is with embodiment 1. Do not add urea composition, only add 1.5% urea.
Table 5 inventive embodiments result
As can be seen from Table 5, urea composition of the present invention has improved immersion Marshall residual stability and the freeze thawing diametral compression test strength ratio of asphalt significantly, obviously improve the water stability of asphalt, will contribute to solve road surface early damage problem.
Also find out, Metallic stearates is little to improving the water stability effect of asphalt simultaneously, and some effect of urea has a remarkable result but urea and stearate are composite, and this illustrates synergy between the two.
Claims (10)
1. for improving an additive for stability of asphalt mixture, it is characterized in that: described additive is urea composition, is the mixture of urea and stearate.
2. according to claim 1 for improving the additive of stability of asphalt mixture, it is characterized in that: in mixture quality, urea accounts for 30% ~ 95%, preferably 50% ~ 80%, the rest is stearate.
3. according to claim 1 and 2 for improving the additive of stability of asphalt mixture, it is characterized in that: described stearate is univalent metal salt and/or divalent metal salt.
4. according to claim 3 for improving the additive of stability of asphalt mixture, it is characterized in that: described univalent metal salt, comprises stearic potassium, lithium, sodium salt, particular certain cancers; Described divalent metal salt comprises stearic calcium, magnesium, zinc salt, preferred calcium salt.
Described in claim 1 to 4 for improving the application of additive for stability of asphalt mixture, it is characterized in that: comprising: add described additive in pitch to (1), then together with gathering materials in mixing equipment mix; Or (2) by above-mentioned additive with pitch, add mixing apparatus together with gathering materials, prepare asphalt.
6. application according to claim 5, is characterized in that: the wherein addition of additive, in asphalt quality, is 0.2% ~ 3.0%.
7. an asphalt, it is characterized in that wherein containing described in aforementioned claim 1-4 for improving the additive of stability of asphalt mixture, in asphalt quality percentage, 0.2% ~ 3.0%, preferably 0.6% ~ 2.0%.
8. asphalt according to claim 7, is characterized in that: with compound weighing scale, described asphalt also comprises: the gathering materials of pitch and surplus.
9. asphalt according to claim 8, is characterized in that: its medium pitch is 3 ~ 10% with the mass ratio gathering materials, and is preferably 5%.
10. the preparation method of asphalt described in a claim 7-9, it is characterized in that: in advance by stirred tank, gather materials, asphalt heating to 130～165 are DEG C for subsequent use, first will gather materials and be added to compound mixing machine, in pitch, add additive of the present invention again, again the pitch that contains additive is joined in mixing machine, stir, obtain asphalt of the present invention; Or, above-mentioned additive with pitch after preheating, add mixing apparatus together with gathering materials, is prepared to asphalt.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108285648A (en) * | 2018-02-07 | 2018-07-17 | 华东交通大学 | A kind of pavement asphalt deicing antistripping additive and preparation method |
| CN112745048A (en) * | 2019-10-30 | 2021-05-04 | 中国石油化工股份有限公司 | Biomass additive for asphalt and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108285648A (en) * | 2018-02-07 | 2018-07-17 | 华东交通大学 | A kind of pavement asphalt deicing antistripping additive and preparation method |
| CN108285648B (en) * | 2018-02-07 | 2020-07-10 | 华东交通大学 | Pavement asphalt deicing anti-stripping additive and preparation method thereof |
| CN112745048A (en) * | 2019-10-30 | 2021-05-04 | 中国石油化工股份有限公司 | Biomass additive for asphalt and preparation method and application thereof |
| CN112745048B (en) * | 2019-10-30 | 2022-03-08 | 中国石油化工股份有限公司 | Biomass additive for asphalt and preparation method and application thereof |
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| CN105585271B (en) | 2017-07-28 |
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