CN106644914B - A kind of evaluation method of snow melt asphalt snow melt effect durability - Google Patents
A kind of evaluation method of snow melt asphalt snow melt effect durability Download PDFInfo
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- CN106644914B CN106644914B CN201710039675.0A CN201710039675A CN106644914B CN 106644914 B CN106644914 B CN 106644914B CN 201710039675 A CN201710039675 A CN 201710039675A CN 106644914 B CN106644914 B CN 106644914B
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- 239000005413 snowmelt Substances 0.000 title claims abstract description 54
- 239000010426 asphalt Substances 0.000 title claims abstract description 43
- 230000000694 effects Effects 0.000 title claims abstract description 23
- 238000011156 evaluation Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000011521 glass Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 6
- 230000033228 biological regulation Effects 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 5
- 238000011835 investigation Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 abstract description 9
- 150000003839 salts Chemical class 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 230000002528 anti-freeze Effects 0.000 description 3
- 206010039203 Road traffic accident Diseases 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 206010060904 Freezing phenomenon Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012546 transfer 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
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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Abstract
The invention discloses a kind of evaluation methods of snow melt asphalt snow melt effect durability, track plate test specimen is formed first, and the length and width of test specimen is measured, local average annual rainfall is obtained by inquiry, and is calculated in 1 year and dropped in the volume of the rainwater in track plate suqare；The volume of fluffy head outflow water in certain time is measured with graduated cylinder again, and the flow velocity of fluffy head is obtained by calculation；Simulated rain trails is carried out later, water in fluffy head is spilt to track plate, track plate surface is received uniformly to wash away, and rainwater after with glass collecting shower every 5 minutes and conductivity is surveyed, minimum conductivity as needed corresponding shower time calculates the effective age of snow melt asphalt snow melt effect durability.The present invention can accurately and easily evaluate the snow melt durability of snow melt asphalt, provide valuable help to the quantitative assessment of snow-melting asphalt pavement snow melt durability.
Description
Technical field
The invention belongs to technical field of road engineering, and in particular to a kind of snow melt asphalt snow melt effect durability
Evaluation method.
Background technique
The territory in China 3/4ths belongs to winter snow cover area, some regional accumulated snow phases are up to 3~4 months.Snowfall, knot
Ice will result directly in the decline of Pavement Skid Resistance performance, lead to braking automobile failure, direction out of control, to easily cause traffic accident.
Related data shows that the attachment coefficient of dried asphalt road is about 0.6, and the attachment coefficient of snowy road surface is 0.2, eisbahn
Attachment coefficient be 0.15, be reduced to the 1/3 and 1/4 of dried asphalt road.Therefore, ice and snow road get on the car be easy skid,
Sideslip, braking distance significantly extend, and have seriously affected the operational stability and safety of vehicle, and traffic accident incidence is higher.
The ingredient that effectively freezes to inhibit of salt is mainly soluble organic fraction (sodium chloride, calcium chloride etc.), by different
Processing technology is processed into particle or powdery form, is added in asphalt, and salt is analysed by porous structure hole
Out, the ice and snow effect for being diffused into road surfaces and road surfaces in the hole of mixture again is reached, the freezing point of the accumulated snow on road surface is reduced,
Ice and snow is converted into liquid water or vapor discharge road surface, achievees the effect that melt ice and snow.The body of porous material after sodium chloride is precipitated
Product is constant, the harm in cavity caused by avoiding mixture from being precipitated because of effective component.
Salt snow-melting asphalt pavement is ice melting capability compared with an important performance on plain asphalt road surface.How accurately to comment
The snow melt durability of valence salt snow-melting asphalt pavement is the pith of salt snow-melting asphalt pavement design.
Currently, it is less to the research of ice-melt snow evaluation aspect both at home and abroad, only exist in the exploratory stage.(1) most common qualitative
Evaluation method is will to melt the situation after ice and snow road snows with plain asphalt road surface winter directly to compare, this method need by
Antifreeze asphalt surfacing, cost is larger, is not suitable for the experimental study stage；(2) test specimen surface layer is scratched after freezing
Phenomenon is observed to evaluate ice-melt snow effect, and this method can intuitively experience the ice-melt snow effect of addition antifreezing agent sample very much
Fruit, but can not accurately carry out the ice-melt snow effect on evaluation road surface；(3) dead load is applied to square plate test specimen and carries out deicing examination
Test, this method using static pressure head it is poor to the simulation of practical pavement behavior, moreover, this method be adapted only to analyze it is icy on road
Ice-breaking effect under state inhibits accumulated snow and icing conditions helpless on road surface；(4) so-called road surface exposure rate refers to vehicle
In the range of traveling, road area (antifreeze road area) and detection section area ratio are exposed, road surface exposure rate is only applicable to
Test section is evaluated in outdoor, and interior can not carry out evaluation ice-melt snow effect with this index.And road surface exposure rate is by vehicle
Flow effect is larger, and vehicle flowrate is bigger, and road surface exposure rate is also bigger.
Summary of the invention
It is an object of the present invention to provide a kind of evaluation method of snow melt asphalt snow melt effect durability, Simulated rainfalls
Influence for snow melt asphalt snow melt effect durability, accurate and easily evaluation snow melt asphalt snow melt are resistance to
Long property.
The technical solution adopted by the present invention are as follows: a kind of evaluation method of snow melt asphalt snow melt effect durability, packet
Include following steps:
Step 1: according in " highway engineering pitch and Asphalt Mixture Experiment regulation JTG E20-2011 " T0703-2011
Method form track plate test specimen, it is long and it is wide be respectively a (mm) and b (mm)；
Step 2: determining that the flow velocity for fluffy head used of sprinkling water, specific method are, with spray in container collection certain time t (min)
Spill the water V (L) come, then the flow velocity of fluffy head is V/t (L/min)；
Step 3: investigation obtains local mean annual precipitation p (mm), and calculates in 1 year and dropped in track plate face accordingly
Rainfall in product range is a*b*p (mm3)；
Step 4: carrying out simulated rain trails, spill the water in fluffy head vertically to track plate surface from certain altitude, make vehicle
Rut plate surface is uniformly washed away, and is collected rainwater with glass in track board bottom portion when test, is collected within every five minutes primary；
Step 5: utilizing conductivity meter, measure the conductivity for the shower track plate rainwater being collected into, obtain different periods leaching
The conductivity of rainwater is with the change trend curve for drenching the time out out；
Step 6: minimum conductivity needed for rainwater out is drenched in selection according to demand drenches the relationship of time out by conductivity-
Curve obtains corresponding shower time T (min) of the conductivity, then the be able to maintain Thaw performance of snow melt asphalt is effective
Service life are as follows: n=T* (V/t) * 106/(a*b*c)。
Preferably, simulated precipitation described in step 4 is tested, watering height is 1m.
Preferably, minimum conductivity needed for drenching rainwater out described in step 6, to wash away 1.5 times that use water conductivity.
The present invention can be used for impact analysis of the Simulated rainfall for snow melt asphalt snow melt effect durability, evaluation
The service life of snow melt asphalt Thaw performance.
Beneficial effects of the present invention:
Compared with the evaluation method of conventional snow melt asphalt snow melt durability, the present invention has obviously in the following areas
Advantage:
(1) economy.For the evaluation of snow-melting asphalt pavement snow melt durability, the most common method is by snow melt road at present
Face is directly compared with prevailing roadway, and this method is needed frost-resistant material surfacing, and cost is larger, and for snow melt road surface
The research of durability is still in the experimental study stage at present, and the present invention provides the interiors of snow melt asphalt snow melt durability
Test model synthetic techniques, test is simple and easy, and cost is relatively low.
(2) time-bounded.The time of several years is generally required with the snow melt durability of conventional method evaluation snow-melting asphalt pavement
Appropriate evaluation could be made to the snow melt durability of snow-melting asphalt pavement according to the actual use situation of bituminous pavement, the present invention mentions
The method of confession can be in a short time according to local actual conditions simulated rainfall, and is dripped according to the Conductivity Evaluation snow melt for drenching rainwater out
The snow melt durability of green mixture, substantially reduces test period.
The present invention can accurately and easily evaluate the snow melt durability of snow melt asphalt, for snow-melting asphalt pavement
The quantitative assessment of snow melt durability has valuable help.
Detailed description of the invention
Fig. 1 is specific embodiment of the invention conductivity-time graph；
Fig. 2 is specific embodiment of the invention conductivity-flushing time relation curve.
Specific implementation method
With reference to embodiment with the Figure of description content that the present invention is furture elucidated.
A kind of evaluation method of snow melt asphalt snow melt effect durability, includes the following steps:
Step 1: according in " highway engineering pitch and Asphalt Mixture Experiment regulation JTG E20-2011 " T0703-2011
The molding mode of rolling form track plate test specimen, the length of track plate and it is wide be respectively a (mm) and b (mm)；
Step 2: determining that the flow velocity for fluffy head used of sprinkling water, specific method are, with spray in container collection certain time t (min)
Spill the water come, the volume that the water received is measured with graduated cylinder is V (L), then the flow velocity of fluffy head is V/t (L/min)；
Step 3: investigation obtains local mean annual precipitation p (mm), and calculates in 1 year and dropped in track plate face accordingly
Rainfall in product range is a*b*p (mm3)；
Step 4: carrying out simulated rain trails, spill the water in fluffy head vertically to track plate surface from certain altitude, make vehicle
Rut plate surface is uniformly washed away, and is collected rainwater with glass in track board bottom portion when test, is collected within every five minutes primary；
Step 5: utilizing conductivity meter, measure the conductivity for the shower track plate rainwater being collected into, obtain different periods leaching
For the conductivity of rainwater with the change trend curve for drenching the time out, the abscissa of the curve is that rainwater drenches time out, ordinate out
For the conductivity for drenching rainwater out, as shown in Figure 1；
Step 6: minimum conductivity needed for rainwater out is drenched in selection according to demand drenches the relationship of time out by conductivity-
Curve obtains corresponding shower time T (min) of the conductivity, then the be able to maintain Thaw performance of snow melt asphalt is effective
Service life are as follows: n=T* (V/t) * 106/(a*b*c)。
Embodiment
Good verification experimental verification has been obtained in measuring method of the invention.Snow melt is had rated using the method in the present invention
The snow melt durability of asphalt.
The embodiment need instrument include: with material
(1) by the method in " highway engineering pitch and Asphalt Mixture Experiment regulation JTG E20-2011 " T0703-2011
The track plate test specimen of forming；(2) watering fluffy head used；(3) graduated cylinder, range 200mL；(4) timer can be accurate to
Second；(5) glass；(6) conductivity meter can measure the conductivity of solution within the scope of 0~100 DEG C, be accurate to 0.001mS/cm.
According to the method in " highway engineering pitch and Asphalt Mixture Experiment regulation JTG E20-2011 " T0703-2011
Track plate test specimen is formed, the length of track plate test specimen is 300mm, width 300mm；Through investigating, the year of In Nanjing in 2014
Average rainfall is 1100mm, then averagely in one-year age drop in the amount of rainfall of track plate range be 300mm × 300mm ×
1100mm=9.9 × 107mm3。
The water that fluffy head outflow in certain time is collected with glass, the volume of water is measured with graduated cylinder, fluffy head is calculated
Flow velocity be 3.9L/min.Fluffy head is fixed on to the position of the 1m right above track plate, fluffy head is opened, spills water to track plate
In range, receives track plate surface and uniformly wash away.
During washing away track plate, rainwater-collecting is carried out with glass in track plate lower part, every 5min container
A certain amount of water flowed down from test specimen is collected, its conductivity is measured, test test result is shown in Table shown in 1 and Fig. 2.
Table 1 washes away conductivity variations situation during track plate
| Time/min | Conductivity/(mS/cm) | Time/min | Conductivity/(mS/cm) |
| 0 | 0.142 | 65 | 0.229 |
| 5 | 0.193 | 70 | 0.210 |
| 10 | 0.236 | 75 | 0.198 |
| 15 | 0.253 | 80 | 0.180 |
| 20 | 0.268 | 85 | 0.175 |
| 25 | 0.292 | 90 | 0.171 |
| 30 | 0.324 | 95 | 0.158 |
| 35 | 0.378 | 100 | 0.155 |
| 40 | 0.433 | 105 | 0.152 |
| 45 | 0.45 | 110 | 0.15 |
| 50 | 0.335 | 115 | 0.147 |
| 55 | 0.278 | 120 | 0.145 |
| 60 | 0.239 | 125 | 0.142 |
Washing away with the conductivity of water is 0.10mS/cm, it can be seen in fig. 2 that the conductivity of early period is smaller, this is because early period
Road surface layer salinity dissolved is fewer, and conductivity is smaller；After 10min, conductivity is incrementally increased, this is because with rainwater
That washes away continues, and the effect of Ion transfer effect, salinity dissolved is more, and the conductivity measured is larger until 40min increases to peak
Value.With the continuous precipitation of antifreeze component, washes away the antifreezing agent component contained in solution and gradually decrease.Water power is used to wash away
1.5 times of conductance, i.e. 0.15mS/cm are 110min as critical value, corresponding time, then the snow melt of snow melt asphalt is resistance to
The service life of long property:
N=110*3.9*106/(9.9*107)=4.33 year
It should be pointed out that for those skilled in the art, without departing from the principle of the present invention,
Several improvements and modifications can also be made, these modifications and embellishments should also be considered as the scope of protection of the present invention.In the present embodiment not
The available prior art of specific each component part is realized.
Claims (3)
1. a kind of evaluation method of snow melt asphalt snow melt effect durability, characterized by the following steps:
Step 1: according to the side in " highway engineering pitch and Asphalt Mixture Experiment regulation JTG E20-2011 " T0703-2011
Method forms track plate test specimen, long and wide respectively a and b；A and b unit is mm；
Step 2: determining the flow velocity for fluffy head used of sprinkling water, specific method is, with the water sprayed out in container collection certain time t
V is measured, then the flow velocity of fluffy head is V/t；The unit of t is min, and the unit of V is L, and the unit of V/t is L/min；
Step 3: investigation obtains local mean annual precipitation p, and calculates in 1 year and dropped within the scope of track plate suqare accordingly
Rainfall be a*b*p；The unit of p is mm, the unit mm of a*b*p3；
Step 4: carrying out simulated rain trails, spill the water in fluffy head vertically to track plate surface from certain altitude, make track plate
Surface is uniformly washed away, and is collected rainwater with glass in track board bottom portion when test, is collected within every five minutes primary；
Step 5: utilizing conductivity meter, measure the conductivity for the shower track plate rainwater being collected into, obtain different periods and drench rain out
The conductivity of water is with the change trend curve for drenching the time out；
Step 6: minimum conductivity needed for rainwater out is drenched in selection according to demand drenches the relation curve of time out by conductivity-,
The corresponding shower time T of the conductivity is obtained, then effective service life of the be able to maintain Thaw performance of snow melt asphalt are as follows:
N=T* (V/t) * 106/(a*b*p)。
2. a kind of evaluation method of snow melt asphalt snow melt effect durability according to claim 1, feature exist
In: the test of simulated precipitation described in step 4, watering height are 1m.
3. a kind of evaluation method of snow melt asphalt snow melt effect durability according to claim 1, feature exist
In: minimum conductivity needed for drenching rainwater out described in step 6, to wash away 1.5 times that use water conductivity.
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| CN111781055B (en) * | 2019-03-18 | 2023-06-13 | 山东高速集团有限公司 | Improved freeze thawing splitting test method for drainage asphalt mixture |
| CN110579503A (en) * | 2019-09-20 | 2019-12-17 | 江西省交通科学研究院 | Indoor test scheme for snow melting and ice melting of SMA asphalt mixture bridge deck pavement layer |
| CN112255127B (en) * | 2020-10-12 | 2021-10-08 | 四川省公路规划勘察设计研究院有限公司 | Low-freezing-point pavement long-term effectiveness evaluation device and method considering service environment |
| CN113960296B (en) * | 2021-10-21 | 2024-10-08 | 江苏东交智控科技集团股份有限公司 | Asphalt pavement freezing resistance effect test device and test method |
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| CN102539651B (en) * | 2011-12-15 | 2014-12-10 | 长安大学 | Snow melting service life predicting device for salt self-snow-melting road surface |
| CN102621292B (en) * | 2012-03-05 | 2015-10-28 | 长安大学 | The test unit of salt from snow melt road surface long-term behaviour is evaluated by simulated rainfall |
| CN104807980B (en) * | 2015-05-23 | 2016-04-20 | 叶春波 | A kind of evaluation method of highway pavement Thaw performance |
| CN104807979B (en) * | 2015-05-24 | 2016-08-24 | 李清斌 | A kind of highway pavement Thaw performance evaluation methodology |
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Effective date of registration: 20231225 Address after: No. 62 Suyuan Avenue, Jiangning Development Zone, Nanjing City, Jiangsu Province, 211106 (Jiangning Development Zone) Patentee after: Jiangsu Chuangwei Transportation Technology Development Co.,Ltd. Address before: 211189 No. 2 Southeast University Road, Jiangning District, Nanjing, Jiangsu Patentee before: SOUTHEAST University |