CN104237323A - Snowmelt long-term efficacy testing method of snowmelt asphalt mixture - Google Patents
Snowmelt long-term efficacy testing method of snowmelt asphalt mixture Download PDFInfo
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- CN104237323A CN104237323A CN201410532260.3A CN201410532260A CN104237323A CN 104237323 A CN104237323 A CN 104237323A CN 201410532260 A CN201410532260 A CN 201410532260A CN 104237323 A CN104237323 A CN 104237323A
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- snowmelt
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Abstract
The invention relates to a snowmelt long-term efficacy testing method of a snowmelt asphalt mixture. The method comprises the steps of using a snowmelt asphalt mixture as an experimental group, using a common snowmelt asphalt mixture without a snowmelt additive as a blank group, using the snowmelt additive as a reference group in an experiment, respectively putting the mixtures and the additive into water, testing electrical conductivity at regular time intervals, performing calculation to obtain the snowmelt long-term efficacy time of the snowmelt asphalt mixture when the electrical conductivity in the snowmelt additive reaches a maximum value. By means of the snowmelt long-term efficacy testing method of the snowmelt asphalt mixture, test data are accurate and reliable, the timeliness of ice and snow melting effect on the snowmelt asphalt road surface in actual engineering can be predicted through an indoor test, and the testing method is used for indoor evaluation on snowmelt long-term efficacy of the snowmelt asphalt mixture.
Description
Technical field
The present invention is a kind of test method long-lasting for the snow melt of effective evaluation snow melt asphalt, and especially a kind of easier solution there is no the method evaluating the long-lasting test of snow melt asphalt snow melt at present, belongs to the technical field of highway pavement performance test.
Background technology
Winter road snow coagulate ice can cause driving inconvenience even cause traffic hazard, for many years, various countries' many employings spreading chloride salt Snow Agent carries out pavement snow melting, though achieve good snow melt deicing effect, causes the corrosion failure of serious environmental pollution and road accessory structure.In recent years, road researcher started the active deicing technological development being devoted to high-efficiency environment friendly, and developed various active deicing pavement technique.Initiatively deicing pavement technique is referred to and to be processed freeze point depression agent by different processing technologys; and be molded into particle or the powder of different-grain diameter; the mineral aggregate of different-grain diameter in replacing asphalt compound; under osmotic pressure and driving vehicle constantly rub the effect that rolls, freeze point depression agent is slowly separated out; forming separation layer at road table makes freezing point significantly reduce, thus makes bituminous pavement have a kind of technology of initiatively deicing function.The ice-melt snow effect of this technology is confirmed by some test sections in the early stage, but be through the effect of long traffic bound and rain drop erosion, freeze point depression agent is constantly separated out, whether it also has in the snow melt effect short time cannot be confirmed, therefore, determine that the test method of its snow melt effect duration is worth research by shop experiment, namely study the evaluation method that ice-melt snow pavement snow melting is long-lasting.
At present, there is no the Experimental Method in Laboratory that ice-melt snow pavement snow melting is long-lasting.Only have and carry out the evaluation method long-lasting to its snow melt by its snow melt effect of Experiment Road site observation season at ice and snow, but be subject to condition restriction and be affected by human factors larger.
Summary of the invention
The object of this invention is to provide and a kind ofly evaluate the long-lasting test method of snow melt asphalt snow melt, the method is simple, solves currently to there is no the problem evaluating the long-lasting test method of snow melt asphalt snow melt.
Evaluate the test method that the snow melt of snow melt asphalt is long-lasting, comprise the steps:
(1) adopt the shaping two groups of test specimens of method of marshall compaction, wherein one group of material for test is snow melt asphalt, is defined as experimental group, and another group is the plain asphalt compound not adding Snow Agent, is defined as blank group;
(2) two groups of test specimens are put into identical bucket respectively, point type stilt is added in bottom, and bottom can be contacted with water preferably; Add volume V
waterthe water yield, make water not have test specimen, described V
water=V
horse× h
1÷ h
2, wherein V
horsefor the volume of test specimen, described h
1for the average annual rainfall of this snow melt asphalt territory of use, unit mm; h
2for snow melt asphalt road surface thickness, unit mm;
(3) another adds volume V
wateridentical bucket, wherein add snow melt adjuvant, the weight of described snow melt adjuvant is identical with snow melt adjuvant added in a snow melt bitumen mixture specimen, is defined as reference group;
(4) determination experiment group, blank group and reference group electrical conductivity of water are designated as K respectively
1, K
2, K
ginseng, the conductivity value of described snow melt asphalt is K
melt=K
1-K
2, unit ms/cm;
(5) remain that the water yield in bucket is constant, measure at regular intervals, record electrical conductivity of water in three buckets, to reference group electrical conductivity of water no longer changes, recording the maximum conductivity value of this reference group water is K
c, and draw K
meltwith the relation curve of time, ask for K
meltlinear equation with time curve, is designated as K
melt=at+b, returns and obtains parameter a, the unit of b, t is hour;
(6) the snow melt asphalt snow melt long-lasting time is calculated,
t refers to effective number of days, i.e. actual precipitation number of days.
Described experimental group and blank group are four cylinder specimens, its K
1, K
2be the mean value of four test specimens.
Described V
horse=π × D
2× h ÷ 4, wherein marshal piece basal diameter is designated as D, unit mm, and height is designated as h, unit mm.
Bucket Cover is added with above described bucket.
The size of described test specimen is high 60 ~ 70mm, diameter 100 ~ 120mm.
Water in described bucket is distilled water.
The numerical value measured in described step (5) is more than 10, and measuring space duration is 24 hours.
Technical scheme:
Concrete steps of the present invention are as follows:
By the method for marshall compaction shaping one group of 4 high 63.5 ± 1.3mm, the right cylinder snow melt bitumen mixture specimen of diameter 101.6mm, then to use the same method and forming materials one group 4 does not add the plain asphalt compound test specimen of snow melt adjuvant.Be numbered, snow melt bitumen mixture specimen is designated as 1,2,3 and 4, and plain asphalt compound test specimen is designated as 5,6,7 and 8, and concrete test procedure is as follows:
The first step: determine water consumption, inquires about the average annual rainfall of this snow melt asphalt territory of use, is designated as h
1, unit mm; Calculate the volume V of a marshal piece
horse=π × D
2× h ÷ 4 (marshal piece basal diameter is designated as D, unit mm, and height is designated as h, unit mm); Inquiry road surface thickness, is designated as h
2(snow melt asphalt be used for road surface), unit mm, the water consumption that marshal piece is corresponding is V
water=V
horse× h
1÷ h
2.
Second step: by two groups of snow melt asphalts and plain asphalt compound totally 8 test specimens put into 8 Plastic Drums respectively, pave with cushion block bottom test specimen, pouring volume respectively into is V
waterdistilled water (as Fig. 1), measure the quality of 8 buckets respectively, be designated as m
1, m
2m
8, for Plastic Drum is added a cover, prevent moisture rapid evaporation.
3rd step: injected slurry volume is V in the 9th bucket
waterdistilled water, put into the snow melt adjuvant that quality is a marshal piece immediately, measure the quality of bucket, be designated as m
9, be defined as reference sample, for Plastic Drum is added a cover, prevent moisture rapid evaporation.
4th step: open conductivity meter, according to the operation instruction of conductivity meter, select suitable electrode, preheating 30min, measures solution temperature in bucket, and the temperature of setting conductivity meter, measures the conductivity of 9 samples respectively, be designated as k
1, k
2k
9, ask for the conductivity mean value of two groups of test specimens respectively, snow melt asphalt is designated as K
1=(k
1+ k
2+ k
3+ k
4) ÷ 4, plain asphalt compound is designated as K
2=(k
5+ k
6+ k
7+ k
8) ÷ 4, reference sample is designated as K
ginseng, then the conductivity value of snow melt asphalt is K
melt=K
1-K
2, unit ms/cm.
5th step a: respectively electrical conductivity of solution was measured to 9 buckets every 24 hours according to the 4th step, and draw K
meltwith the relation curve of time, each mensuration in forward direction bucket adds distilled water, ensures that the quality of bucket is m
1, m
2m
9, the quality error of each barrel is 5g.
6th step: treat K
ginsengwhen substantially not increasing, read K
ginsengmaximal value be designated as K
c, to K
meltafter measuring 15 times, ask for K
meltlinear equation with time curve, is designated as K
melt=at+b, returns and obtains parameter a, the unit of b, t is hour.
7th step: prediction snow melt asphalt snow melt long-lasting time,
t refers to effective number of days, i.e. actual precipitation number of days.
By means of only the different snow melt adjuvant snow melt bitumen mixture specimen of replacement, variety classes snow melt asphalt can be measured and melt long-lasting.
The present invention creatively changes long-lasting test method avenged by current snow melt asphalt present situation without evaluation ice-melt, by this test method, can be predicted the timeliness of snow-melting asphalt pavement snow melt effect by shop experiment more accurately.
The a certain proportion of snow melt adjuvant of admixture in asphalt, the principal ingredient of snow melt adjuvant is chloride, will produce chlorion after this chloride is water-soluble, Chlorine in Solution ion concentration is higher, and solution conductivity performance is stronger, otherwise less.Therefore, principle of the present invention is the electric conductivity of test water solution, thus judges Chlorine in Solution ion concentration size, and reflection snow melt adjuvant separates out speed indirectly.
Beneficial effect: this kind measures the long-lasting test method of snow melt asphalt snow melt, test figure accurately and reliably, by the timeliness of snow-melting asphalt pavement ice-melt snow effect in shop experiment prediction Practical Project, provide test method for Lab-evaluation snow melt asphalt ice-melt snow is long-lasting.
Inventor has carried out the mensuration of mass data to test method, and this test method trial state is good, basically identical with actual observation result, illustrates that test method of the present invention is rational, reliable, practical.
Accompanying drawing explanation
Fig. 1 is the long-lasting process of the test schematic diagram of snow melt,
1-Plastic Drum; 2-distilled water; 3-test specimen; 4-cushion block.
The long-lasting test findings figure of the different snow melt asphalt snow melts of Fig. 2.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1
Experimental technique:
The first step: by the method for marshall compaction shaping one group of 4 high 63.5 ± 1.3mm, the right cylinder snow melt bitumen mixture specimen of diameter 101.6mm, then to use the same method and forming materials one group 4 does not add the plain asphalt compound test specimen of snow melt adjuvant.Be numbered, snow melt bitumen mixture specimen is designated as 1,2,3 and 4, and plain asphalt compound test specimen is designated as 5,6,7 and 8, and concrete test procedure is as follows:
The first step: determine water consumption, inquires about the average annual rainfall of this snow melt asphalt territory of use, is designated as h
1, unit mm; Calculate the volume V of a marshal piece
horse=π × D
2× h ÷ 4 (marshal piece basal diameter is designated as D, unit mm, and height is designated as h, unit mm); Inquiry road surface thickness, is designated as h
2(snow melt asphalt be used for road surface), unit mm, the water consumption that marshal piece is corresponding is V
water=V
horse× h
1÷ h
2.
Second step: by two groups of snow melt asphalts and plain asphalt compound totally 8 test specimens 3 put into 8 Plastic Drums 1 respectively, pave with cushion block 4 bottom test specimen, pouring volume respectively into is V
waterdistilled water 2 (as Fig. 1), measure the quality of 8 buckets respectively, be designated as m
1, m
2m
8, for Plastic Drum is added a cover, prevent moisture rapid evaporation.
3rd step: injected slurry volume is V in the 9th bucket
waterdistilled water, put into the snow melt adjuvant that quality is a marshal piece immediately, measure the quality of bucket, be designated as m
9, be defined as reference sample, for Plastic Drum is added a cover, prevent moisture rapid evaporation.
4th step: open conductivity meter, according to the operation instruction of conductivity meter, select suitable electrode, preheating 30min, measures solution temperature in bucket, and the temperature of setting conductivity meter, measures the conductivity of 9 samples respectively, be designated as k
1, k
2k
9, ask for the conductivity mean value of two groups of test specimens respectively, snow melt asphalt is designated as K
1=(k
1+ k
2+ k
3+ k
4) ÷ 4, plain asphalt compound is designated as K
2=(k
5+ k
6+ k
7+ k
8) ÷ 4, reference sample is designated as K
ginseng, then the conductivity value of snow melt asphalt is K
melt=K
1-K
2, unit ms/cm.
5th step a: respectively electrical conductivity of solution was measured to 9 buckets every 24 hours according to the 4th step, and draw K
meltwith the relation curve of time, each mensuration in forward direction bucket adds distilled water, ensures that the quality of bucket is m
1, m
2m
9, the quality error of each barrel is 5g.
6th step: treat K
ginsengwhen substantially not increasing, read K
ginsengmaximal value be designated as K
c, to K
meltafter measuring 15 times, ask for K
meltlinear equation with time curve, is designated as K
melt=at+b, returns and obtains parameter a, the unit of b, t is hour.
7th step: prediction snow melt asphalt snow melt long-lasting time,
t refers to effective number of days, i.e. actual precipitation number of days.
By means of only different snow melt adjuvant snow melt bitumen mixture specimen (in Fig. 1 3) of replacement, variety classes snow melt asphalt can be measured and melt long-lasting.Test findings is as table 1 and Fig. 2.
The long-lasting test findings table of table 1 different snow melt asphalt snow melt
Claims (7)
1. evaluate the test method that the snow melt of snow melt asphalt is long-lasting, comprise the steps:
(1) adopt the shaping two groups of test specimens of method of marshall compaction, wherein one group of material for test is snow melt asphalt, is defined as experimental group, and another group is the plain asphalt compound not adding Snow Agent, is defined as blank group;
(2) two groups of test specimens are put into identical bucket respectively, point type stilt is added in bottom, and bottom can be contacted with water preferably; Add volume V
waterthe water yield, make water not have test specimen, described V
water=V
horse× h
1÷ h
2, wherein V
horsefor the volume of test specimen, described h
1for the average annual rainfall of this snow melt asphalt territory of use, unit mm; h
2for snow melt asphalt road surface thickness, unit mm;
(3) another adds volume V
wateridentical bucket, wherein add snow melt adjuvant, the weight of described snow melt adjuvant is identical with snow melt adjuvant added in a snow melt bitumen mixture specimen, is defined as reference group;
(4) determination experiment group, blank group and reference group electrical conductivity of water are designated as K respectively
1, K
2, K
ginseng, the conductivity value of described snow melt asphalt is K
melt=K
1-K
2, unit ms/cm;
(5) remain that the water yield in bucket is constant, measure at regular intervals, record electrical conductivity of water in three buckets, to reference group electrical conductivity of water no longer changes, the conductivity value recording this reference group water maximum is designated as K
c, and draw K
meltwith the relation curve of time, ask for K
meltlinear equation with time curve, is designated as K
melt=at+b, returns and obtains parameter a, the unit of b, t is hour;
(6) the snow melt asphalt snow melt long-lasting time is calculated,
(my god), T refers to effective number of days, i.e. actual precipitation number of days.
2. test method according to claim 1, described experimental group and blank group are four cylinder specimens, its K
1, K
2be the mean value of four test specimens.
3. test method according to claim 2, described V
horse=π × D
2× h ÷ 4, wherein marshal piece basal diameter is designated as D, unit mm, and height is designated as h, unit mm.
4. test method according to claim 3, the size of described test specimen is high 60 ~ 70mm, diameter 100 ~ 120mm.
5. test method according to claim 1, is added with Bucket Cover above described bucket.
6. test method according to claim 1, the water in described bucket is distilled water.
7. test method according to claim 1, K in described step (5)
meltthe numerical value measured is more than 10, and measuring space duration is 24 hours.
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|---|---|---|---|
| CN201410532260.3A CN104237323B (en) | 2014-10-10 | 2014-10-10 | The long-lasting test method of snow melt asphalt snow melt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410532260.3A CN104237323B (en) | 2014-10-10 | 2014-10-10 | The long-lasting test method of snow melt asphalt snow melt |
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|---|---|
| CN104237323A true CN104237323A (en) | 2014-12-24 |
| CN104237323B CN104237323B (en) | 2017-06-16 |
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108595833A (en) * | 2018-04-23 | 2018-09-28 | 长安大学 | Life prediction method is avenged in storage salt asphalt ice-melt based on BP neural network |
| CN109708992A (en) * | 2018-12-25 | 2019-05-03 | 长安大学 | A kind of phase transformation asphalt ice-melt snow effect detection device and detection method |
| CN111650073A (en) * | 2020-06-15 | 2020-09-11 | 河北工业大学 | Method for testing snow melting and ice melting capability of phase-change asphalt mixture |
| CN112255127A (en) * | 2020-10-12 | 2021-01-22 | 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 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108595833A (en) * | 2018-04-23 | 2018-09-28 | 长安大学 | Life prediction method is avenged in storage salt asphalt ice-melt based on BP neural network |
| CN108595833B (en) * | 2018-04-23 | 2022-03-25 | 长安大学 | BP neural network-based method for estimating snow-melting life of salt-storage asphalt mixture |
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| CN111650073A (en) * | 2020-06-15 | 2020-09-11 | 河北工业大学 | Method for testing snow melting and ice melting capability of phase-change asphalt mixture |
| CN111650073B (en) * | 2020-06-15 | 2024-02-13 | 河北工业大学 | Method for testing snow and ice melting capability of phase-change asphalt mixture |
| CN112255127A (en) * | 2020-10-12 | 2021-01-22 | 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 |
| 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 |
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