CN103528941A - Test method for evaluating erosion damage of asphalt mixture caused by acid rain - Google Patents
Test method for evaluating erosion damage of asphalt mixture caused by acid rain Download PDFInfo
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- CN103528941A CN103528941A CN201310487342.6A CN201310487342A CN103528941A CN 103528941 A CN103528941 A CN 103528941A CN 201310487342 A CN201310487342 A CN 201310487342A CN 103528941 A CN103528941 A CN 103528941A
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Abstract
The invention discloses a test method for evaluating the erosion damage of an asphalt mixture caused by acid rain. The test method comprises the following steps: preparing artificial acid rain with pH being 4 from c(SO4<2->):c(NO<3->); making three groups of standard Marshall test pieces according to the existing test procedures; putting the first group of test pieces into a thermostatic water bath at 25 DEG C and preserving the temperature for 1 hour, and fixing the test pieces with a vertical hydraulic piston of an asphalt mixture direct shear device; respectively soaking the other two groups of test pieces in running water at 25 DEG C and a simulated acid rain solution for 7 days, taking out the test pieces, naturally drying for 1 day and soaking again, wherein three cycles are performed in total; putting the asphalt mixture Marshall test pieces subjected to the three cycles of dry-wet circulation of the running water and acid rain in the thermostatic water bath at 25 DEG C and preserving the temperature for 1 hour; measuring the shear strength with the self-developed asphalt mixture direct shear device; and calculating the acid resistance coefficient Xi according to a formula. According to the method disclosed by the invention, the acid rain erosion resistance of the asphalt mixture is comprehensively evaluated according to the acid resistance coefficient after acid rain corrosion, and the problem of water damage of the asphalt pavement is reduced and prevented.
Description
Technical field
The invention belongs to construction material technical field, relate in particular to a kind of test method of acid rain to asphalt erosion damage of evaluating.
Background technology
Acid rain impels mineral aggregate quality softening to the erosion action meeting of bituminous pavement, its corner angle are disappeared, accelerate it at the wheel burnishing action under rolling friction effect repeatedly, in mineral aggregate polishing, pavement skid resistance friction factor, noise, water smoke, dabble, a series of functions of surface such as dazzle also decline thereupon, secondly, acid rain reduces the cohesive force of mineral aggregate and pitch to the erosion action meeting of bituminous pavement, under the acting in conjunction of vehicular load and precipitation, impel pitch from mineral aggregate surfacial spalling, make surface layer bellding, groove is cheated in loose so that formation, again, acid rain makes mineral aggregate mass loss to the erosion action of bituminous pavement, impel material internal damage, reduce the mechanical strength of asphalt, make bituminous pavement under various load actions, easily produce the diseases such as cracking and distortion, reduce the permanance of asphalt, reduce the serviceable life of bituminous pavement.
At present, about Water Damage of Asphalt Mixtures evaluation method, have much both at home and abroad, sum up, mainly contain: immersion Marshall Test method, freeze thawing splitting test method, APA Immersion Wheel Truck Test method etc., engineering practice shows that these evaluation methods are to the effect of prevention and control Water Damage on Asphalt Pavement not bery desirable, from rain factor analysis, rainfall amount, rainfall intensity, rainfall duration, the pH value of rainwater chemical composition and rainwater all can affect the order of severity of Water Damage on Asphalt Pavement, rapid growth along with world economy, acid rain phenomenon is more and more serious, and to the whole world, expand, China is the Europe of continuing now, the third-largest acid rain section occurring in the world after North America, the area coverage of Acid Rain Zone accounts for 40% left and right of China's area, main Distribution Area is the Sichuan Basin on the south the Changjiang river, Guizhou, Hunan, Hubei, Jiangxi and coastal Fujian, 11 provinces such as Guangdong, its southwest and center area Acid Rain Pollution is the most serious, and in above-mentioned all test methods, all do not consider the erosion damage effect of acid rain to bituminous pavement, therefore these test methods can not be evaluated the acid rain resistant erosion performance of asphalt, can not play the effect that reduces and prevent Water Damage on Asphalt Pavement.
Existing immersion Marshall Test method, does not consider the erosion damage effect of acid rain to bituminous pavement; Test specimen is only subject to pressure-acting radially, and test specimen bears embedded squeezing power and inner frictional resistance that this part pressure is mainly mineral aggregate, there is no fully to reflect the effect of cohesive force in asphalt, and cohesive force power affects the one of the main reasons of Moisture Damage exactly; The residual stability that immersion Marshall Test is measured is higher, even there is result after part test specimen immersion to be greater than before immersion, this and the Practical Project Asphalt Mixture fact that its whole mechanical strength can reduce under immersion condition differs larger, so the discrimination of its deliberated index and validity are obviously not enough.
Existing freeze thawing splitting test method, do not consider the erosion damage effect of acid rain to bituminous pavement, under the condition of splitting, test specimen inside is tension state, the destruction of test specimen is mainly to cause gradually because inner cohesive force is not enough to resist the effect of external load, and acid rain is not only embodied in the cohesive force that reduces pitch and mineral aggregate to the erosion damage of asphalt, is also embodied in and makes that mineral aggregate produces mass loss, quality is softened and the destruction such as corner angle disappearance.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of test method of acid rain to asphalt erosion damage of evaluating, be intended to solve existing immersion Marshall Test method, do not consider that acid rain is obviously not enough to the discrimination of the erosion damage effect deliberated index of bituminous pavement and validity, freeze thawing splitting test method is not considered the problem of acid rain to the erosion damage effect of bituminous pavement.
The embodiment of the present invention is achieved in that a kind of test method of acid rain to asphalt erosion damage of evaluating, and this evaluation acid rain comprises the following steps the test method of asphalt erosion damage:
Step 1, according to China's acid rain actual conditions, the acid solution proportion of composing of simulation China sulfuric acid type rainfall, selects c (SO
4 2-): c (NO
3-) prepare the artificial acid rain of PH=4;
Step 4, puts into 25 ℃ of Water Tanks with Temp.-controlled by the asphalt marshal piece after three cycle tap water and acid rain drying and watering cycle and is incubated 1 hour, then adopts independently developed asphalt direct shear apparatus to measure shear resistance;
Step 5, calculates acidproof coefficient ξ by formula.
Further, in step 1, select mol ratio c (SO
4 2-): c (NO
3-the ratio of)=9:1 is prepared the artificial acid rain of PH=4.
Further, in step 2, the vertical hydraulic piston of the asphalt direct shear apparatus fixedly using method of test specimen is: the oil pump by longitudinal pressing keeps after balance marshal piece longitudinal stress, use the oil pump of side direction pressurization to make marshal piece produce lateral shear destruction, the moment of destroying is read test figure by the pressure dial plate of oil pump, is characterized by shear resistance.
Further, in step 5, calculate as follows acidproof coefficient ξ:
In formula: the acidproof coefficient of ξ-asphalt after acid rain corrosion;
F
0the initial shear intensity of-asphalt;
F
wthe shear resistance of-asphalt after aqueous solution effects;
F
a-asphalt affects the shear resistance of all after dates through acid rain corrosion;
Adopt acidproof coefficient ξ to evaluate the acid rain resistant erosion performance of asphalt.
Another object of the present invention is to provide asphalt direct shear apparatus, this asphalt direct shear apparatus comprises: upper shear box, down cut box, vertical hydraulic piston, horizontal hydraulic pressure piston, pressure compensator, vertical loading pump, horizontal hydraulic pressure piston, horizontal load pump form;
Upper shear box be arranged on down cut box above, vertical hydraulic piston be arranged on shear box above, horizontal hydraulic pressure piston is arranged on the left side of shear box, vertical loading pump is arranged on the right side of vertical hydraulic piston, pressure compensator is arranged between vertical loading pump and vertical hydraulic piston, and horizontal load pump connects horizontal hydraulic pressure piston.
The test method of evaluation acid rain provided by the invention to asphalt erosion damage, by acid rain is analyzed asphalt erosion damage mechanism, sum up acid rain asphalt erosion damage is mainly reflected in to two aspects: (1) acid rain penetrates asphalt membrane and chemical reaction has occurred mineral aggregate, cause the constituent contents such as the Ca, the K that gather materials, Fe, C, Al to reduce, mass loss occurs; (2) acid rain and pitch generation chemical reaction, cause its inner oxidative condensation that occurs, and causes similar oxidation and aging action, reduces the cohesive force of pitch and mineral aggregate; Then with the acidproof coefficient after acid rain corrosion, carry out the acid rain resistant erosion performance of comprehensive evaluation asphalt, can solve to a certain extent traditional test method and can not evaluate the acid rain resistant erosion performance of asphalt, can not play the problem that reduces and prevent Water Damage on Asphalt Pavement.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the evaluation acid rain that provides of the embodiment of the present invention to the test method of asphalt erosion damage;
Fig. 2 is the structural representation of the asphalt direct shear apparatus that provides of the embodiment of the present invention;
In figure: 1, upper shear box; 2, down cut box; 3, vertical hydraulic piston; 4, horizontal hydraulic pressure piston; 5, pressure compensator; 6, vertical loading pump; 7, horizontal hydraulic pressure piston; 8, horizontal load pump.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the test method flow process of evaluation acid rain provided by the invention to asphalt erosion damage.For convenience of explanation, only show part related to the present invention.
The test method of evaluation acid rain of the present invention to asphalt erosion damage, this evaluation acid rain comprises the following steps the test method of asphalt erosion damage:
Step 1, according to China's acid rain actual conditions, the acid solution proportion of composing of simulation China sulfuric acid type rainfall, selects c (SO
4 2-): c (NO
3-) prepare the artificial acid rain of PH=4;
Step 4, puts into 25 ℃ of Water Tanks with Temp.-controlled by the asphalt marshal piece after three cycle tap water and acid rain drying and watering cycle and is incubated 1 hour, then adopts independently developed asphalt direct shear apparatus to measure shear resistance;
Step 5, calculates acidproof coefficient ξ by formula.
As a prioritization scheme of the embodiment of the present invention, in step 1, select mol ratio c (SO
4 2-): c (NO
3-the ratio of)=9:1 is prepared the artificial acid rain of PH=4.
A prioritization scheme as the embodiment of the present invention, in step 2, the vertical hydraulic piston of the asphalt direct shear apparatus fixedly using method of test specimen is: the oil pump by longitudinal pressing keeps after balance marshal piece longitudinal stress, use the oil pump of side direction pressurization to make marshal piece produce lateral shear destruction, the moment of destroying is read test figure by the pressure dial plate of oil pump, is characterized by shear resistance.
As a prioritization scheme of the embodiment of the present invention, in step 5, calculate as follows acidproof coefficient ξ:
In formula: the acidproof coefficient of ξ-asphalt after acid rain corrosion;
F
0the initial shear intensity of-asphalt;
F
wthe shear resistance of-asphalt after aqueous solution effects;
F
a-asphalt affects the shear resistance of all after dates through acid rain corrosion;
Adopt acidproof coefficient ξ to evaluate the acid rain resistant erosion performance of asphalt.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Figure 1, the evaluation acid rain of the embodiment of the present invention comprises the following steps the test method of asphalt erosion damage:
S101: according to China's acid rain actual conditions, the acid solution proportion of composing of simulation China sulfuric acid type rainfall, selects mol ratio c (SO
4 2-): c (NO
3-the ratio of)=9:1 prepare PH=4 artificial acid rain '
S102: make three groups of standard marshal pieces according to existing testing regulations, first group of test specimen put into 25 ℃ of Water Tanks with Temp.-controlled and be incubated 1 hour, the vertical hydraulic piston that then adopts independently developed asphalt direct shear apparatus is test specimen fixedly;
S103: the oil pump by longitudinal pressing keeps after balance marshal piece longitudinal stress, use the oil pump of side direction pressurization to make marshal piece produce lateral shear destruction, the moment of destroying is read test figure by the pressure dial plate of oil pump, is characterized by shear resistance;
S104: other two groups of test specimens are soaked in respectively in 25 ℃ of tap water and Simulated Acid Rain solution, soak after taking-up allows its natural drying 1 day after 7 days soak again, soak-dry-soak cycle carries out repeatedly, carries out altogether three cycles;
S105: the asphalt marshal piece after three cycle tap water and acid rain drying and watering cycle is put into 25 ℃ of Water Tanks with Temp.-controlled and be incubated 1 hour, then adopt independently developed asphalt direct shear apparatus to measure its shear resistance;
S106: calculate acidproof coefficient ξ by formula.
Concrete steps of the present invention are:
The first step, according to China's acid rain actual conditions, the acid solution proportion of composing of simulation China sulfuric acid type rainfall, selects mol ratio c (SO
4 2-): c (NO
3-the ratio of)=9:1 is prepared the artificial acid rain of PH=4;
Second step, according to existing testing regulations, make three groups of standard marshal pieces, first group of test specimen put into 25 ℃ of Water Tanks with Temp.-controlled and be incubated 1 hour, then the vertical hydraulic piston that adopts asphalt direct shear apparatus is test specimen fixedly, oil pump by longitudinal pressing keeps after balance marshal piece longitudinal stress, use the oil pump of side direction pressurization to make marshal piece produce lateral shear destruction, the moment of destruction is read test figure by the pressure dial plate of oil pump, is characterized by shear resistance;
The 3rd step, other two groups of test specimens are soaked in respectively in 25 ℃ of tap water and Simulated Acid Rain solution, after after 7 days soak, taking-up allows its natural drying 1 day, soak again, soak-dry-soak cycle carries out repeatedly, carry out altogether three cycles, in process of the test, measure the acidity of simulation solution every day with accurate pH test paper, finds when acidity declines to add sulfuric acid and nitric acid mixed solution pH value to be adjusted to test initial value, the acidity of strict control of acid rain solution;
The 4th step, puts into 25 ℃ of Water Tanks with Temp.-controlled by the asphalt marshal piece after three cycle tap water and acid rain drying and watering cycle and is incubated 1 hour, then adopts independently developed asphalt direct shear apparatus to measure its shear resistance;
The 5th step, calculate as follows acidproof coefficient ξ:
In formula: the acidproof coefficient of ξ-asphalt after acid rain corrosion;
F
0the initial shear intensity of-asphalt;
F
wthe shear resistance of-asphalt after aqueous solution effects;
F
a-asphalt affects the shear resistance of all after dates through acid rain corrosion;
Adopt acidproof coefficient ξ to evaluate the acid rain resistant erosion performance of asphalt.
As shown in Figure 2, the asphalt direct shear apparatus of the embodiment of the present invention mainly by: upper shear box 1, down cut box 2, vertical hydraulic piston 3, horizontal hydraulic pressure piston 4, pressure compensator 5, vertical loading pump 6, horizontal hydraulic pressure piston 7, horizontal load pump 8 form; Upper shear box 1 be arranged on down cut box 1 above, vertical hydraulic piston 3 be arranged on shear box 1 above, horizontal hydraulic pressure piston 4 is arranged on the left side of shear box 1, vertical loading pump 6 is arranged on the right side of vertical hydraulic piston 3, pressure compensator 5 is arranged between vertical loading pump 6 and vertical hydraulic piston 3, and horizontal load pump 8 connects horizontal hydraulic pressure piston 7;
The vertical load that drives vertical hydraulic piston 3 to apply perpendicular to marshal piece by a vertical loading pump 6.By another horizontal load pump 8, drive 7 pairs of upper shear boxs 1 of a pair of horizontal hydraulic pressure piston to apply horizontal force, the power applying is delivered to down cut box 2 from horizontal hydraulic pressure piston 7 by being connected to a pair of yoke on upper shear box 1 and pliable and tough steel cable, vertical load system has been equipped with pressure compensator 5, can compensate the variation of the vertical load that shear surface is expanded after the displacement of sample occurred level to produce, make its maintenance constant;
The present invention analyzes asphalt erosion damage mechanism acid rain, can sum up acid rain asphalt erosion damage is mainly reflected in to two aspects: (1) acid rain penetrates asphalt membrane and chemical reaction has occurred mineral aggregate, cause the constituent contents such as the Ca, the K that gather materials, Fe, C, l to reduce, mass loss occurs; (2) acid rain and pitch generation chemical reaction, cause its inner oxidative condensation that occurs, and causes similar oxidation and aging action, reduces the cohesive force of pitch and mineral aggregate; Based on above analysis, Simulated Acid Rain, to bituminous pavement erosion damage, has been developed the test method of a kind of brand-new acid rain to asphalt erosion damage, is used for evaluating the acid rain resistant erosion performance of asphalt.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. evaluate the test method of acid rain to asphalt erosion damage, it is characterized in that, this evaluation acid rain comprises the following steps the test method of asphalt erosion damage:
Step 1, according to China's acid rain actual conditions, the acid solution proportion of composing of simulation China sulfuric acid type rainfall, selects c (SO
4 2-): c (NO
3-) prepare the artificial acid rain of PH=4;
Step 2, makes three groups of standard marshal pieces according to existing testing regulations, first group of test specimen is put into 25 ℃ of Water Tanks with Temp.-controlled and be incubated 1 hour, and the vertical hydraulic piston that then adopts asphalt direct shear apparatus is test specimen fixedly,
Step 3, is soaked in other two groups of test specimens respectively in 25 ℃ of tap water and Simulated Acid Rain solution, after 7 days soak, takes out after natural drying 1 day and soaks, and soak-dry-soak cycle carries out repeatedly, carries out altogether three cycles;
Step 4, puts into 25 ℃ of Water Tanks with Temp.-controlled by the asphalt marshal piece after three cycle tap water and acid rain drying and watering cycle and is incubated 1 hour, then adopts independently developed asphalt direct shear apparatus to measure shear resistance;
Step 5, calculates acidproof coefficient ξ by formula.
2. the test method of evaluation acid rain as claimed in claim 1 to asphalt erosion damage, is characterized in that, in step 1, selects mol ratio c (SO
4 2-): c (NO
3-the ratio of)=9:1 is prepared the artificial acid rain of PH=4.
3. the test method of evaluation acid rain as claimed in claim 1 to asphalt erosion damage, it is characterized in that, in step 2, the vertical hydraulic piston of the asphalt direct shear apparatus fixedly using method of test specimen is: the oil pump by longitudinal pressing keeps after balance marshal piece longitudinal stress, use the oil pump of side direction pressurization to make marshal piece produce lateral shear destruction, the moment of destroying is read test figure by the pressure dial plate of oil pump, is characterized by shear resistance.
4. the test method of evaluation acid rain as claimed in claim 1 to asphalt erosion damage, is characterized in that, in step 5, calculates as follows acidproof coefficient ξ:
In formula: the acidproof coefficient of ξ-asphalt after acid rain corrosion;
F
0the initial shear intensity of-asphalt;
F
wthe shear resistance of-asphalt after aqueous solution effects;
F
a-asphalt affects the shear resistance of all after dates through acid rain corrosion;
Adopt acidproof coefficient ξ to evaluate the acid rain resistant erosion performance of asphalt.
5. an asphalt direct shear apparatus, it is characterized in that, this asphalt direct shear apparatus comprises: upper shear box, down cut box, vertical hydraulic piston, horizontal hydraulic pressure piston, pressure compensator, vertical loading pump, horizontal hydraulic pressure piston, horizontal load pump form;
Upper shear box be arranged on down cut box above, vertical hydraulic piston be arranged on shear box above, horizontal hydraulic pressure piston is arranged on the left side of shear box, vertical loading pump is arranged on the right side of vertical hydraulic piston, pressure compensator is arranged between vertical loading pump and vertical hydraulic piston, and horizontal load pump connects horizontal hydraulic pressure piston.
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Cited By (9)
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| CN104458820A (en) * | 2014-12-06 | 2015-03-25 | 韩少鹏 | Water damage test device for asphalt concrete pavements and use method thereof |
| CN104964913A (en) * | 2015-06-24 | 2015-10-07 | 廖引家 | Acid corrosion resistance detection method for radiation shield concrete |
| CN104977241A (en) * | 2015-06-24 | 2015-10-14 | 廖引家 | Acid corrosion resistance detection method of portland fly-ash cement |
| CN105547864A (en) * | 2016-01-22 | 2016-05-04 | 武汉轻工大学 | Method for determining shear strength of chemically polluted soil and special full-automatic direct shear apparatus |
| CN106404542A (en) * | 2016-12-01 | 2017-02-15 | 山东路达试验仪器有限公司 | Asphalt mixture Marshall stability tester |
| CN107436282A (en) * | 2016-12-12 | 2017-12-05 | 西安科技大学 | A kind of analogy method of acid-rain corrosion solution |
| CN107917873A (en) * | 2017-12-05 | 2018-04-17 | 南京林业大学 | A kind of test method of asphalt oil resistant corrosion energy |
| CN110873669A (en) * | 2019-11-27 | 2020-03-10 | 江苏中路工程检测有限公司 | Device and method for evaluating and testing long-term water stability of asphalt mixture |
| CN116242717A (en) * | 2023-01-05 | 2023-06-09 | 哈尔滨学院 | Mechanical property testing device of fiber concrete initial torsion member scaling model |
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Cited By (14)
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|---|---|---|---|---|
| CN104458820A (en) * | 2014-12-06 | 2015-03-25 | 韩少鹏 | Water damage test device for asphalt concrete pavements and use method thereof |
| CN104964913A (en) * | 2015-06-24 | 2015-10-07 | 廖引家 | Acid corrosion resistance detection method for radiation shield concrete |
| CN104977241A (en) * | 2015-06-24 | 2015-10-14 | 廖引家 | Acid corrosion resistance detection method of portland fly-ash cement |
| CN105547864A (en) * | 2016-01-22 | 2016-05-04 | 武汉轻工大学 | Method for determining shear strength of chemically polluted soil and special full-automatic direct shear apparatus |
| CN105547864B (en) * | 2016-01-22 | 2018-07-27 | 武汉轻工大学 | The assay method and dedicated full-automatic direct shear apparatus of chemical contamination shear strength of soil |
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| CN106404542A (en) * | 2016-12-01 | 2017-02-15 | 山东路达试验仪器有限公司 | Asphalt mixture Marshall stability tester |
| CN107436282A (en) * | 2016-12-12 | 2017-12-05 | 西安科技大学 | A kind of analogy method of acid-rain corrosion solution |
| CN107917873A (en) * | 2017-12-05 | 2018-04-17 | 南京林业大学 | A kind of test method of asphalt oil resistant corrosion energy |
| CN107917873B (en) * | 2017-12-05 | 2020-05-19 | 南京林业大学 | Method for testing oil corrosion resistance of asphalt mixture |
| CN110873669B (en) * | 2019-11-27 | 2021-01-05 | 中路交科(江苏)检测科技有限公司 | Device and method for evaluating and testing long-term water stability of asphalt mixture |
| CN110873669A (en) * | 2019-11-27 | 2020-03-10 | 江苏中路工程检测有限公司 | Device and method for evaluating and testing long-term water stability of asphalt mixture |
| CN116242717A (en) * | 2023-01-05 | 2023-06-09 | 哈尔滨学院 | Mechanical property testing device of fiber concrete initial torsion member scaling model |
| CN116242717B (en) * | 2023-01-05 | 2023-12-05 | 哈尔滨学院 | Mechanical property testing device of fiber concrete initial torsion member scaling model |
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Application publication date: 20140122 |