CN110763594B - Method for testing activation degree of rock asphalt - Google Patents
Method for testing activation degree of rock asphalt Download PDFInfo
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- CN110763594B CN110763594B CN201911045745.9A CN201911045745A CN110763594B CN 110763594 B CN110763594 B CN 110763594B CN 201911045745 A CN201911045745 A CN 201911045745A CN 110763594 B CN110763594 B CN 110763594B
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention relates to a method for testing the activation degree of rock asphalt. The test method comprises the steps of activating the rock asphalt and then subjecting the activated rock asphalt to an activation test by a slump test. The test method ensures the accuracy of test results by taking samples randomly and in different parts on the basis of not changing the physical and chemical characteristics of the rock asphalt, controlling the water content of the samples, heating the baking oven and other measures, is simple and convenient to operate, has high practicability and is convenient to popularize and apply in the production and construction processes.
Description
Technical Field
The invention relates to a method for testing the activation degree of rock asphalt, which can be used for evaluating the activation performance of the rock asphalt in processing enterprises or construction sites.
Background
The Buton rock asphalt is stored in the form of ore, wherein the proportion of the asphalt is about 20-30%, the proportion of mineral inorganic matters is about 70-80%, the asphalt is mainly distributed in gaps of the mineral, and if the asphalt is not treated, the asphalt is directly fused with matrix asphalt to be modified, so that few effective asphalt can play a role. Therefore, in order to effectively utilize the asphalt in the rock asphalt and improve the modification effect of the rock asphalt, the utilization rate of the effective asphalt in the rock asphalt must be improved.
The technical key of the activation treatment process is as follows: the rock asphalt is subjected to activation treatment such as crushing, dehydration and the like, and is subjected to hot fine grinding at high temperature, so that the fineness of the rock asphalt is favorably improved, the rock asphalt is favorably glued with matrix asphalt at high temperature, the gluing degree between the rock asphalt and the matrix asphalt is further improved, and the modification capability of the rock asphalt is favorably fully exerted. The structure condition of the rock asphalt molecules after high-temperature activation is researched, the rock asphalt molecules after high-temperature activation can be represented through microscopic images, the rock asphalt molecules after high-temperature activation have extremely strong polarity, the asphalt molecules in the matrix asphalt are connected with resin and ash in the rock asphalt to form a stable multidimensional network structure, and the performance of the matrix asphalt is effectively improved. However, no effective method for testing the activation effect of the rock asphalt exists in the production process or the construction process at present.
The existing slump test is mainly used for testing and evaluating the consistency of cement concrete in engineering, and simultaneously, the cohesiveness, the water-retaining property and the like of the concrete are evaluated visually. The invention provides an effective rock asphalt activation degree testing method by improving the existing slump testing method and applying the slump testing method to the evaluation of the activation effect in the rock asphalt production and processing process.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a method for testing and evaluating the activation degree of rock asphalt. First, the Buton rock bitumen is "activated". Then, the change of the Buton rock asphalt before and after the "activation" treatment was compared by a slump test. The test object is the pier-laying rock asphalt, so that the preparation, the test steps, the result judgment and the like before the test are obviously different from the common cement concrete slump test. Before the test, the water content of the rock asphalt needs to be tested and controlled to be less than or equal to 1 percent; in consideration of the influence of rock asphalt segregation and sample uniformity, samples need to be respectively extracted from the upper part, the middle part and the lower part of a test sample. In the experimental process, main equipment needs to be firstly cured in an oven at 60 ℃ for 1 hour; considering the influence of the viscosity of the rock asphalt on the test result, a release agent needs to be coated around the slump cone and at the bottom of the rubber top plate, and the insertion and falling of the rock asphalt in the barrel filling process are forbidden; the process of taking down the slump cone needs to be finished in an oven, and the slump is measured after the oven is closed and is kept stand for 10 min; the calculation result needs to consider the slump standard value.
The subject of the present invention is therefore a method for testing the degree of activation of a rock bitumen, comprising the following steps:
1) activating rock asphalt;
2) subjecting the activated rock asphalt to an activation test by a slump determination test, wherein the activation test comprises the following steps:
i) preparing an experimental instrument, sampling in an activated rock asphalt finished product area, and uniformly stirring a rock asphalt sample to divide the rock asphalt sample into three parts;
ii) placing the three rock asphalt samples, the weights, the slump bucket and the tray into an oven for curing;
iii) uniformly smearing a separating agent on the inner wall of the slump bucket, placing the slump bucket in the center of the tray, and pouring rock asphalt into the slump bucket until the surface height of the rock asphalt is about 1cm higher than the upper edge of the slump bucket;
iv) uniformly coating a release agent on the bottom of the rubber plate, placing the rubber plate on rock asphalt, and adding a weight to the center of the rubber plate;
v) placing the tray into an oven, timing the temperature of the oven from 60 ℃, and keeping for 15 min;
vi) opening the drying oven, taking down the weights and the rubber plates, scraping off the rock asphalt exceeding the upper edge of the slump barrel by using a steel ruler to enable the rock asphalt surface and the edge of the slump barrel to be on the same plane, taking down the slump barrel, and operating the whole process in the drying oven for not more than 1 min;
vii) the oven was closed, and after 10min the slump height a was measured,
3) the slump value of the sample was taken as the average of the three slump values.
In one embodiment of the invention, activating the rock bitumen comprises the steps of: adding rock asphalt particles with the crushed particle size of less than 3mm into activation equipment, dehydrating at 150-180 ℃, stirring and keeping for 9 minutes.
In another embodiment of the invention, the laboratory instruments for the activity test include a slump bucket, a steel ruler, a tray, a release agent, an oven, a rubber plate, a weight and an electronic balance.
In another embodiment of the invention, sampling is randomly done by dividing the rock asphalt into 10 different locations, each bag into the upper, middle and lower three locations, each location taking 200 g.
In another embodiment of the invention, the oven was started in advance and the temperature was set to 60 ℃ before testing.
In another embodiment of the invention, prior to testing, the moisture content of the bitumen is tested according to method T0305, with values below 1% for further testing, and above 1% for drying.
The invention provides a brand-new and effective method for testing the activation degree of the rock asphalt by adopting an improved slump method. The test method ensures the accuracy of test results by taking samples randomly and in parts on the basis of not changing the physical and chemical characteristics of the rock asphalt, controlling the water content of the samples, heating the oven and other measures, is the macroscopic and most direct test method for evaluating the activation effect of the rock asphalt in the production and processing links, is simple and convenient to operate, has high practicability, and is convenient to popularize and apply in the production and construction processes.
Drawings
FIG. 1 shows a schematic diagram of slump measurement according to the present invention.
Detailed Description
Firstly, the rock asphalt activation comprises the following steps: adding rock asphalt particles with the crushed particle size of less than 3mm into activation equipment, dehydrating at 150-180 ℃, stirring and keeping for 9 minutes; because the moisture in the rock asphalt can form a tension film, the cohesive force of the rock asphalt is reduced, the water content needs to be strictly controlled in the setting of the test standard, and the influence of the variable water content on the activation degree test is reduced, so that the water content of the dehydrated rock asphalt particles is controlled below 5%. The process activates resin components in the rock asphalt, the activated oil coats sand grains, the original rock asphalt is converted into peptized asphalt, the use effect of the asphalt is improved, the activation process is simple, the energy consumption is low, the requirement on construction is not high, and the application in a large range can be realized.
Then, the degree of activation of the rock asphalt was tested. Whether the oil content of the rock asphalt and the smoothness and hardness of the test mold have negative influence on the accuracy needs to be considered in the test. In addition, the activated rock asphalt has high cohesive force, and the activation degree test is influenced because the cohesive force of the heat-absorbing asphalt can be attached to surrounding rock particles in the long-term storage process, and the factor is considered in the test method.
The macroscopic test method for the activation degree of the rock asphalt comprises the following steps:
1. testing instrument
Slump bucket: the upper opening is 100mm, the lower opening is 200mm, and the height is 300 mm;
a steel ruler: the measuring range is 500mm, and the scale is 1 mm;
a tray: 800mm × 800 mm;
a release agent: mixing glycerol and pulvis Talci at a ratio of 2: 1;
oven: the heating range is not lower than 100 ℃, and the temperature control precision is +/-2 ℃;
rubber plate: the thickness is 2-5mm, the length is 120mm and the width is 120 mm;
weight: cylindrical, 500 g;
an electronic balance: the sensory quantity is not more than 0.5 g.
2. Sampling
Sampling is carried out in an activated rock asphalt finished product area, 10 rock asphalt in different positions are randomly selected, each bag is divided into an upper part, a middle part and a lower part, each part is 200g, and the total weight is 6 kg.
3. Preparation of the experiment
1) Starting the drying oven in advance, and setting the temperature to be 60 ℃;
2) testing the water content of the rock asphalt according to a T0305 method, wherein the water content of the rock asphalt is lower than 1%, and the next test can be carried out, and the rock asphalt is dried when the water content is higher than 1%;
3) the rock asphalt sample is evenly stirred and divided into three parts, each of which is 2 kg.
4. Procedure for the preparation of the
1) Placing the three parts of rock asphalt, the weight, the slump constant barrel and the tray into a 60 ℃ oven, and maintaining for 1 h;
2) after uniformly smearing the isolating agent on the inner wall of the slump bucket, placing the slump bucket in the center of the tray, pouring rock asphalt into the slump bucket, and lightly smoothing the surface of the rock asphalt by using a steel ruler until the height of the surface of the rock asphalt is about 1cm higher than the upper edge of the slump bucket. Rock asphalt must not be deliberately compacted or tamped;
3) uniformly coating a release agent on the bottom of the rubber plate, putting the rubber plate on the rock asphalt to cover the whole surface, and adding a 500g weight to the center of the rubber plate;
4) placing the tray into an oven, timing the oven temperature from 60 deg.C, keeping for 15min, and accurately controlling the process temperature at 60 deg.C (+/-0.5 deg.C);
5) and opening the oven, and taking down the weight and the rubber plate. Scraping off rock asphalt beyond the upper edge of the slump barrel by using a steel ruler, enabling the rock asphalt surface and the edge of the slump barrel to be on the same plane, and taking down the slump barrel. The whole process is operated in an oven, and the time is not more than 1 min;
6) the oven was turned off and after 10min the slump height a was measured.
5. Computing
And taking the average value of the three slump as the slump value of the sample, and activating and disqualification when the slump height a is greater than a standard value h.
Note: and determining the standard value according to the test collected data, and additionally making a comparison value of the unactivated rock asphalt, wherein the standard value is higher than the comparison value of the unactivated rock asphalt and is preferably lower than the lower limit of the test value of the activated rock asphalt.
The foregoing description of the preferred embodiments of the invention has been presented. It is to be understood that the invention is not limited to the particular embodiments described above, wherein test devices and methods not described in detail are understood to be practiced in a manner common in the art; without thereby departing from the scope of the invention, it will be understood by those skilled in the art that various changes and modifications may be made, and equivalents may be substituted, by those skilled in the art without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (5)
1. A method for testing the degree of activation of rock asphalt, the method comprising the steps of:
1) activating rock asphalt;
2) subjecting the activated rock asphalt to an activation test by a slump determination test, wherein the activation test comprises the following steps:
i) preparing an experimental instrument, sampling in an activated rock asphalt finished product area, and uniformly stirring a rock asphalt sample to divide the rock asphalt sample into three parts;
ii) placing the three rock asphalt samples, the weights, the slump constant barrel and the tray into an oven for curing;
iii) uniformly smearing a separating agent on the inner wall of the slump bucket, placing the slump bucket in the center of the tray, and pouring rock asphalt into the slump bucket until the surface height of the rock asphalt is 1cm higher than the upper edge of the slump bucket;
iv) uniformly coating a release agent on the bottom of the rubber plate, placing the rubber plate on rock asphalt, and adding a weight to the center of the rubber plate;
v) placing the tray into an oven, timing the temperature of the oven from 60 ℃, and keeping for 15 min;
vi) opening the oven, taking down the weights and the rubber plate, scraping off the rock asphalt exceeding the upper edge of the slump bucket by using a steel ruler, enabling the rock asphalt surface and the edge of the slump bucket to be on the same plane, taking down the slump bucket, and operating the whole process in the oven for not more than 1 min;
vii) the oven was closed, and after 10min the slump height a was measured,
3) taking the average value of the three slump values as the slump value of the sample,
wherein, before the test, the moisture content of the rock asphalt is tested according to a T0305 method, the value of the moisture content is less than 1 percent, the next test is carried out, and more than 1 percent of the moisture content needs to be dried.
2. The method for testing the rock asphalt activation degree according to claim 1, wherein the rock asphalt activation comprises the following steps: adding rock asphalt particles with the crushed particle size of less than 3mm into activation equipment, dehydrating at 150-180 ℃, stirring and keeping for 9 minutes.
3. A method for testing the degree of activation of a rock asphalt as claimed in claim 1 or claim 2, wherein the laboratory apparatus for the degree of activation test further comprises an electronic balance.
4. A method for testing the degree of activation of rock asphalt as claimed in claim 1 or 2, wherein sampling is randomly done by taking 10 different positions of rock asphalt, taking three positions of upper, middle and lower, and 200g for each position.
5. A test method of rock asphalt activation degree according to claim 1 or 2, wherein before the test, the oven is started in advance and the temperature is set to 60 ℃.
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| CN111610123B (en) * | 2020-04-14 | 2021-04-09 | 佛山市交通科技有限公司 | Method and device for measuring fluidity improvement coefficient of regenerant |
| CN114441530B (en) * | 2022-01-17 | 2023-05-12 | 山东省路桥集团有限公司 | Evaluation method for activation degree of old asphalt mixture of pavement |
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| CN1563585A (en) * | 2004-04-02 | 2005-01-12 | 长沙理工大学 | Substitution material in use for testing construction machinery for asphalt pavement, and its prodn. tech |
| CN105131622A (en) * | 2015-09-30 | 2015-12-09 | 河北伦特石油化工有限公司 | Rubber powder modified asphalt and production method thereof |
| CN106189299A (en) * | 2016-08-25 | 2016-12-07 | 仇颖超 | A kind of preparation method of appts of modified asphalt by utilizing waste tyre rubber powder |
| CN106568669A (en) * | 2016-11-10 | 2017-04-19 | 同济大学 | Method of testing adhesion of rock asphalt |
| CN107057739A (en) * | 2017-04-18 | 2017-08-18 | 湖北正康天然沥青科技有限公司 | A kind of Low-temperature activation method of kir |
| CN107793774A (en) * | 2017-11-10 | 2018-03-13 | 湖北正康天然沥青科技有限公司 | A kind of processes of rock asphalt modified asphalt oil abrasion method processing technology |
| CN109946441A (en) * | 2019-03-26 | 2019-06-28 | 长沙理工大学 | A kind of cryogenic property analysis method of processes of rock asphalt modified asphalt |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6408683B2 (en) * | 1998-06-15 | 2002-06-25 | Wisconsin Alumni Research Foundation | Laboratory asphalt stability test and apparatus |
| JP5103159B2 (en) * | 2007-12-27 | 2012-12-19 | 前田道路株式会社 | Workability evaluation tester for asphalt mixture |
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- 2019-10-30 CN CN201911045745.9A patent/CN110763594B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563585A (en) * | 2004-04-02 | 2005-01-12 | 长沙理工大学 | Substitution material in use for testing construction machinery for asphalt pavement, and its prodn. tech |
| CN105131622A (en) * | 2015-09-30 | 2015-12-09 | 河北伦特石油化工有限公司 | Rubber powder modified asphalt and production method thereof |
| CN106189299A (en) * | 2016-08-25 | 2016-12-07 | 仇颖超 | A kind of preparation method of appts of modified asphalt by utilizing waste tyre rubber powder |
| CN106568669A (en) * | 2016-11-10 | 2017-04-19 | 同济大学 | Method of testing adhesion of rock asphalt |
| CN107057739A (en) * | 2017-04-18 | 2017-08-18 | 湖北正康天然沥青科技有限公司 | A kind of Low-temperature activation method of kir |
| CN107793774A (en) * | 2017-11-10 | 2018-03-13 | 湖北正康天然沥青科技有限公司 | A kind of processes of rock asphalt modified asphalt oil abrasion method processing technology |
| CN109946441A (en) * | 2019-03-26 | 2019-06-28 | 长沙理工大学 | A kind of cryogenic property analysis method of processes of rock asphalt modified asphalt |
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Inventor after: Yan Jin Inventor after: Zhang Lianzhen Inventor after: Li Yafei Inventor after: Chen Jing Inventor after: Wei Daoxin Inventor after: Hui Jia Inventor before: Yan Jin Inventor before: Chen Jing Inventor before: Li Yafei |