CN111948113A - Method for determining mixing amount of snow-melting filler in snow-melting asphalt mixture - Google Patents
Method for determining mixing amount of snow-melting filler in snow-melting asphalt mixture Download PDFInfo
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- CN111948113A CN111948113A CN202010806687.3A CN202010806687A CN111948113A CN 111948113 A CN111948113 A CN 111948113A CN 202010806687 A CN202010806687 A CN 202010806687A CN 111948113 A CN111948113 A CN 111948113A
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- 238000002844 melting Methods 0.000 title claims abstract description 74
- 239000010426 asphalt Substances 0.000 title claims abstract description 53
- 239000000945 filler Substances 0.000 title claims abstract description 49
- 239000000203 mixture Substances 0.000 title claims abstract description 42
- 238000002156 mixing Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 43
- 230000008018 melting Effects 0.000 claims abstract description 12
- 239000011800 void material Substances 0.000 claims description 18
- 238000010998 test method Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002411 adverse Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000005413 snowmelt Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/14—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation
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- Chemical & Material Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a method for determining the doping amount of a snow-melting filler in a snow-melting asphalt mixture, which is characterized by comprising the following steps of: (1) forming a standard test piece, (2) performing a density test, (3) performing a freeze-thaw splitting test, and (4) evaluating the mixing amount range of the snow melting filler. The porosity range is 2.0-3.5%, the freeze-thaw splitting strength ratio meets more than 80% or meets the related specifications or actual engineering requirements, and the range meeting the conditions is the target mixing amount range of the snow-melting filler. The determination method provided by the invention can effectively determine the range of the adding amount of the snow-melting filler in the snow-melting asphalt mixture, so that the snow-melting asphalt mixture can meet the normal pavement performance requirement of the asphalt pavement while ensuring the snow-melting effect.
Description
Technical Field
The invention discloses a method for determining the mixing amount of a snow-melting filler in a snow-melting asphalt mixture, belonging to the technical field of highway asphalt pavement design.
Background
Road construction and operation are important components of national economy, and have a vital promoting effect on national economy. In the road operation process, two major challenges are faced at present to ensure smooth traffic and safe driving. Especially in large cities with increasingly serious traffic congestion, the service capacity of roads becomes a decisive factor influencing the normal operation of the cities.
Under the cold climate environment in winter, the road surface is easy to be accumulated with snow and ice, ice and snow disasters are formed, the problems of road surface adhesion coefficient reduction, automobile skidding, direction runaway and the like are caused, and traffic jam and even paralysis are often caused. Therefore, it is necessary to adopt various measures and means to remove the snow and ice on the road surface. While maintaining good road quality to provide adequate service capacity, road safety is increased to resist traffic accidents from inclement weather.
The snow-melting asphalt pavement is characterized in that snow-melting materials are doped when the pavement is paved, and slowly separate out in the long-term use process, so that the snow on the pavement surface is melted. The snow melting and deicing device has the advantages of being active, efficient, capable of melting ice and snow from bottom to top and the like, can achieve continuous and lasting snow melting and deicing, avoids a series of adverse effects caused by using a large amount of snow melting agents, and improves snow melting and deicing efficiency under the rolling effect of vehicle loads.
However, in practical applications, the amount of snow-melting filler added to the asphalt mixture is not as great as possible. Studies have shown that snow melting fillers adversely affect the water stability of the mix. The water damage, the track and the crack are arranged in parallel as three main disease modes of various grades of asphalt pavements in China. The asphalt mixture has insufficient water damage resistance, so that pits are generated on the road surface, and the driving safety is seriously influenced. Therefore, the adding amount of the snow-melting filler should be controlled within a range, so that the snow-melting asphalt mixture can meet the requirement of active snow melting and the requirement of road performance.
Disclosure of Invention
The invention aims to provide a method for determining the mixing amount of a snow-melting filler in a snow-melting asphalt mixture, and solves the problems that the water stability is influenced by too much snow-melting filler mixed in the snow-melting asphalt mixture, and the active snow-melting effect cannot be achieved by too little snow-melting filler mixed in the snow-melting asphalt mixture.
A method for determining the mixing amount of a snow-melting filler in a snow-melting asphalt mixture comprises the steps of test piece molding, density detection, freeze-thaw splitting detection and snow-melting filler mixing amount evaluation,
the test piece forming step is as follows:
forming a test piece according to a test method of road engineering asphalt and asphalt mixture test procedure T0702-2011;
the density detection step comprises the following steps:
testing according to a test method T0705-2011 of road engineering asphalt and asphalt mixture test procedures, and calculating to obtain the void ratio of the test piece;
the freeze-thaw splitting detection step comprises the following steps:
testing according to a test method T0729-2000 of road engineering asphalt and asphalt mixture test procedures, and calculating to obtain a freeze-thaw splitting strength ratio of a test piece;
the snow melting filler mixing amount determining step comprises the following steps:
preparing asphalt mixtures with different mixing amounts of the snow-melting filler into test pieces, respectively carrying out density detection and freeze-thaw splitting tests, drawing a curve chart of the mixing amount of the snow-melting filler and the void ratio, and determining that the void ratio is in a range of 2.0-3.5% and corresponds to a mixing amount range C1 of the snow-melting filler; drawing a curve graph of the mixing amount of the snow-melting filler and the freeze-thaw splitting strength ratio, determining the mixing amount range C2 of the snow-melting filler corresponding to the freeze-thaw splitting strength ratio of more than 80%, wherein the mixing amount C of the snow-melting filler at the overlapping part of C1 and C2 is the target mixing amount range.
The curve chart of the doping amount of the snow-melting filler and the porosity and the curve chart of the ratio of the doping amount of the snow-melting filler and the freeze-thaw splitting strength are the same double-coordinate axis curve chart.
In the test piece forming, the formed test piece is a standard test piece, the size is phi 101.6mm multiplied by 63.5mm, and the compaction times are respectively 50 times on two sides.
In the density detection, in the process of weighing the mass of the test piece in water, the soaking time of the test piece in water is not longer than 3 min.
In the method for determining the mixing amount of the snow-melting filler, the range of the freeze-thaw splitting strength ratio can be adjusted according to relevant specifications or actual requirements.
The size of the void fraction affects the stability of the snow-melting asphalt mixture, and the freeze-thaw split strength ratio affects the water stability of the snow-melting asphalt mixture. The selected void ratio ranges from 2.0% to 3.5%, the upper limit is to prevent the problem that the void ratio of the asphalt mixture is increased after the snow melting filler is separated out, so that the stability of the internal structure of the asphalt mixture is influenced, and the lower limit is to prevent the problem that the high-temperature stability of the asphalt mixture is influenced due to the excessively small void ratio; because the addition of the snow melting filler can reduce the water stability of the asphalt mixture to different degrees, and the freeze-thaw splitting strength ratio is selected to be more than 80 percent in order to ensure the water stability of the asphalt mixture. When the two indexes are simultaneously met, the range of the mixing amount of the snow-melting filler is defined.
Drawings
FIG. 1 is a graph of void fraction and freeze-thaw split strength ratio with two coordinate axes.
Detailed Description
The present invention will be described in further detail with reference to examples.
According to the actual engineering requirements, different blending amounts of the snow-melting filler in the asphalt mixture are determined, and the following steps are respectively carried out on the snow-melting asphalt mixture with different blending amounts.
The evaluation method comprises the following steps:
asphalt mixture grading composition table
| Mesh size (mm) | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Grading (%) | 100 | 96.5 | 34.9 | 26.1 | 18.7 | 13.4 | 9.9 | 8.2 | 7.2 |
Forming the proportion of the asphalt mixture according to engineering requirements, and evaluating the proportion of the asphalt mixture as follows:
(1) and (3) molding a test piece according to a test method T0702-2011 of road engineering asphalt and asphalt mixture test regulation, wherein the molded test piece is a standard test piece, the size of the standard test piece is phi 101.6mm multiplied by 63.5mm, and the compaction times are respectively 50 times for two sides.
(2) Performing density test according to a test method T0705-2011 of road engineering asphalt and asphalt mixture test procedures, wherein in the process of weighing the mass of a test piece in water, the test piece is soaked in the water for not more than 3 min; and calculating to obtain the porosity of the test piece.
(3) And (3) performing freeze-thaw splitting test according to a test method of 'road engineering asphalt and asphalt mixture test procedure' T0729-2000, and calculating to obtain the freeze-thaw splitting strength ratio of the test piece.
The test results are shown in table 1.
TABLE 1 test results for snow-melting asphalt mixture
| Snowmelt filler content (%) | Void ratio (%) | Freeze-thaw split strength ratio (%) |
| 0 | 4.1 | 93.4 |
| 2 | 3.4 | 87.0 |
| 4 | 2.9 | 83.2 |
| 6 | 2.5 | 79.8 |
(4) The method comprises the steps of respectively carrying out density and freeze-thaw splitting tests on the asphalt mixture with different blending amounts of the snow-melting filler, drawing a double-coordinate-axis curve of the void ratio and the freeze-thaw splitting strength ratio as shown in figure 1, determining that the void ratio is within the range of 2.0-3.5 in the void ratio curve and the blending amount range of the snow-melting filler is more than or equal to 1.7% (between 1-2%), determining that the blending amount range of the snow-melting filler corresponding to the freeze-thaw splitting strength ratio of more than 80% in the freeze-thaw splitting strength ratio curve is less than or equal to 5.8%, wherein the proportions of different materials in the design of the blending ratio of the asphalt mixture are generally counted by integers, namely the blending amount of the snow-melting filler is also an integer, and the maximum value of the blending amount of the snow-. Similarly, the minimum value of the amount of snow-melting filler corresponding to the upper limit of the void ratio on the right side is 2%, and the maximum value of the amount of snow-melting filler corresponding to the lower limit of the void ratio is necessarily more than 5%. Therefore, it is preferable that: the overlapping range of the snow-melting filler under the two indexes is 2-5% of the target mixing amount range.
Claims (5)
1. A method for determining the mixing amount of a snow-melting filler in a snow-melting asphalt mixture comprises the steps of test piece molding, density detection, freeze-thaw splitting detection and snow-melting filler mixing amount determination,
(1) the test piece forming step is as follows:
forming a test piece according to a test method of road engineering asphalt and asphalt mixture test procedure T0702-2011;
(2) the density detection step comprises the following steps:
testing according to a test method T0705-2011 of road engineering asphalt and asphalt mixture test procedures, and calculating to obtain the void ratio of the test piece;
(3) the freeze-thaw splitting detection step comprises the following steps:
testing according to a test method T0729-2000 of road engineering asphalt and asphalt mixture test procedures, and calculating to obtain a freeze-thaw splitting strength ratio of a test piece;
(4) the snow melting filler mixing amount determining step comprises the following steps:
respectively carrying out density detection and freeze-thaw splitting tests on the asphalt mixtures with different mixing amounts of the snow-melting filler, drawing a plot of the mixing amount of the snow-melting filler and the void ratio to determine that the void ratio is in a range of 2.0-3.5% and corresponds to the mixing amount range C1 of the snow-melting filler; drawing a curve graph of the mixing amount of the snow-melting filler and the freeze-thaw splitting strength ratio, determining the mixing amount range C2 of the snow-melting filler corresponding to the freeze-thaw splitting strength ratio of more than 80%, wherein the mixing amount C of the snow-melting filler at the overlapping part of C1 and C2 is the target mixing amount range.
2. The method according to claim 1, wherein the graph of the dosage and the void ratio of the snow-melting filler and the graph of the ratio of the dosage and the freeze-thaw splitting strength of the snow-melting filler are the same two-coordinate axis graph.
3. The method according to claim 1, wherein the test piece formed in the step (1) is a standard test piece with the size of phi 101.6mm x 63.5mm, and the striking times are 50 times for each surface.
4. The method as claimed in claim 1, wherein in the density detection in step (2), the test piece is soaked in water for not longer than 3min in the process of weighing the mass of the test piece in water.
5. The method according to claim 1, wherein in the step (4) of determining the amount of the snow-melting filler, the range of the freeze-thaw splitting strength ratio can be adjusted according to relevant specifications or actual requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010806687.3A CN111948113A (en) | 2020-08-12 | 2020-08-12 | Method for determining mixing amount of snow-melting filler in snow-melting asphalt mixture |
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| CN202010806687.3A CN111948113A (en) | 2020-08-12 | 2020-08-12 | Method for determining mixing amount of snow-melting filler in snow-melting asphalt mixture |
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| CN111948113A true CN111948113A (en) | 2020-11-17 |
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