CN104406868A - Scouring freeze-thaw splitting test method for porous asphalt mixtures - Google Patents
Scouring freeze-thaw splitting test method for porous asphalt mixtures Download PDFInfo
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Abstract
The invention discloses a scouring freeze-thaw splitting test method for porous asphalt mixtures. The method comprises the following steps: firstly, performing grading and asphalt-aggregate ratio design on the porous asphalt mixtures, blending the porous asphalt mixtures indoors and forming test pieces; secondly, randomly equally dividing the test pieces into two groups, directly performing a splitting test on the first group of test pieces, scouring the surfaces of the second group of test pieces under the corresponding pressure intensity for the corresponding time according to the actual vehicle speed and pavement design traffic volume, performing a freeze-thaw test, and after the scouring freeze-thaw circulation is finished twice, performing the splitting test; finally, comparing the average splitting strength of the second group of test pieces with that of the first group of test pieces. According to the method, whether the design of the porous asphalt mixtures is reasonable or not can be judged and the water stability of different porous asphalt mixtures can be compared; also, an actual pavement sample can be analyzed, the performance of pavement materials in different service stages can be judged, the basis can be provided for developing pre-maintenance measures of pavement performance, and the long-term service performance of the pavement can be guaranteed.
Description
Technical field
The present invention relates to Asphalt Mixture Experiment technical field, be specifically related to a kind of porous asphalt mixture and wash away indirect tensile test on frozen-thaw method.
Background technology
Porous asphalt pavement porous asphalt mixture larger for voidage is laid on road table as drainage blanket, lay dense bitumen compound down at it simultaneously and lay the pavement structure form of aquiclude at interlayer, can ensure that rainwater enters porous asphalt mixture layer, but ooze under not continuing, but be discharged to pavement structure outside rapidly along porous asphalt mixture layer.Porous asphalt mixture adopts gap grading, and the voidage of compound is between 18%-25%, and based on connectivity gap, road surface has superior drainage performance and reduces the function of noise.Porous asphalt pavement effectively can reduce road table ponding, especially road table moisture film is reduced in the rainy day remarkable with the effect of driving water drift, porous asphalt pavement is conducive to discharging the pressurized air between tire and road surface simultaneously, thus playing the effect reducing noise, good Pavement Design can reduce road rumble 1 ~ 5 decibel.Therefore, porous asphalt pavement can well improve travel safety and comfortableness.Higher voidage and the existence of connectivity gap are the keys of porous asphalt mixture pavement performance and function, but under the effect of the factors such as load, rain drop erosion and temperature Change, the large space of porous asphalt mixture also easily causes porous asphalt mixture generation Performance Decay, even occur loose, thus cause the inefficacy of pavement structure performance.Therefore, scholars always payes attention to the usability stability of porous asphalt mixture under load and environmental factor combined action.
Although the factor causing porous asphalt mixture gap rate to decay is a lot, asphalt is exposed in physical environment always, and rain drop erosion has important impact to this.The moment that bituminous pavement surface is terminated in moment and the effect of Driving Loading, all produce vacuum " pump suction " effect, when particularly there is connectivity gap in bituminous pavement, this vacuum " pump suction " effect just changes current scour at a high speed into.To porous asphalt pavement, compared with oozing under nature, under the effect of vehicular load, in space, current scour speed is larger, larger impact can be produced on the stability of porous asphalt mixture, therefore rational evaluation under Vehicle Load rain drop erosion to the design of porous asphalt mixture performance impact to porous asphalt mixture and the great significance for design of porous asphalt pavement.
At present, the Moisture Susceptibility Evaluation of asphalt is mainly divided into two classes, and a class is static test, and comprise immersion Marshall test, compressive strength after immersion test, indirect tensile test on frozen-thaw, another kind of is dynamic test, i.e. Immersion Wheel Truck Test.Immersion Marshall test and indirect tensile test on frozen-thaw is adopted to evaluate the water stability of asphalt in China " highway engineering pitch and Asphalt Mixture Experiment code " (JTG E20-2011).Indirect tensile test on frozen-thaw condition is strict, vacuum satisfy water process in water fully enter in marshal piece, and in Frozen-thawed cycled process, in test specimen space, the state of water there occurs change, therefore more presses close to the real damaged condition in road surface than immersion Marshall test.But research shows, immersion Marshall test and indirect tensile test on frozen-thaw all do not consider the dynamic souring of current, and for porous asphalt mixture, under Vehicle Load, the impact of rain drop erosion on the decay of its voidage and performance is larger, therefore, present stage is to the evaluation method of porous asphalt mixture water stability all Shortcomings.
Current Chinese code of practice adopts the Ratio of split strength index before and after Frozen-thawed cycled to evaluate about the checking of stability of asphalt mixture, and the evaluation of asphalt anti-water damage property should comprise two parts: one is water sensitivity evaluation, two is evaluate asphalt mechanical performance index final after Moisture Damage simulation process, i.e. residual modal forces.Therefore, current Chinese code of practice just have rated the asphalt part that whether anti-water damage property is responsive under water environment effect, but does not evaluate the ability of compound opposing water destruct, i.e. water stability is not complete anti-water damage property evaluation.Porous asphalt mixture gap rate is larger, connectivity gap is more, under the Vehicle Load of running at high speed, current scour is at a high speed there is in mixture gap, accelerate the Moisture Damage of bituminous pavement, the importance of rational evaluation stability of asphalt mixture as can be seen here, and present stage the evaluation index to porous asphalt mixture anti-water damage property be unilateral.
Summary of the invention
The present invention seeks to the shortcoming for existing porous asphalt mixture Moisture Susceptibility Evaluation and index, a kind of porous asphalt mixture is provided to wash away indirect tensile test on frozen-thaw method, by the antiscour freeze thawing performance of Laboratory Evaluation porous asphalt mixture, porous asphalt pavement water stability in actual use can be judged simply and easily.
The present invention is by the following technical solutions:
A kind of porous asphalt mixture washes away indirect tensile test on frozen-thaw method, comprises the steps:
Step 1: according to porous asphalt mixture design bitumen aggregate ratio and grating, according to T 0702-2011 compacting process in " highway engineering pitch and Asphalt Mixture Experiment code JTG E20-2011 ", indoor are mixed and stirred and are produced porous asphalt mixture and shaping test piece; Or directly carry out sampling from actual road surface and obtain test specimen;
Step 2: after step 1 completes, the voidage detecting test specimen, in positive and negative 0.5% scope of design object voidage, gives up test specimen not up to standard; For same porous asphalt mixture, parallel test specimen >=6 of each test;
Step 3: test specimen is divided into two groups at random, is labeled as the 1st group and the 2nd group respectively;
Step 4: the 1st group of test specimen directly carries out diametral compression test according to " highway engineering pitch and Asphalt Mixture Experiment code JTG E20-2011 ", obtains the cleavage strength of the 1st group of test specimen;
Step 5: the 2nd group of test specimen is placed in constant temperature oven, under 25 DEG C ± 1 DEG C condition, insulation is no less than 60min;
Step 6: the test specimen of step 5 good heat insulation is placed in the position that washout test machine washes away 10cm ± 1cm immediately below pressure head, and simulating wheel pressure washes away 60 ~ 120min to test specimen upper surface;
Step 7: test specimen step 6 washed away is placed in vacuum drying chamber, keeps 15min, then opens valve under vacuum tightness is 97.3 ~ 98.7kPa condition, recovers normal pressure, test specimen is placed 0.5h in water;
Step 8: the test specimen of step 7 is taken out and puts into polybag, add water, tighten sack, test specimen is put into constant temperature refrigerator, be incubated 16h ± 1h under-18 DEG C ± 2 DEG C conditions;
Step 9: taken out by the test specimen of step 8, puts into the Water Tank with Temp.-controlled of 60 DEG C ± 0.5 DEG C, insulation 24h ± 1h;
Step 10: step 5 ~ 9 are one and wash away Frozen-thawed cycled, that repeats that step 5 ~ 9 complete the 2nd group of test specimen washes away freezing and thawing test the 2nd time; Correspondingly freezing-thawing cycles is washed away in adjustment according to actual needs;
Step 11: test specimen step 10 completed carries out diametral compression test according to " highway engineering pitch and Asphalt Mixture Experiment code JTGE20-2011 ", obtains the cleavage strength of the 2nd group of test specimen;
Step 12: calculate the cleavage strength mean value of the 1st group of test specimen and the cleavage strength mean value of coefficient of dispersion and the 2nd group of test specimen and coefficient of dispersion;
Step 13: the average cleavage strength of the average cleavage strength of the 2nd group of test specimen and the 1st group of test specimen is compared, represents with number percent.
Shaping test piece described in step 1 is shaping standard marshal piece.
Simulating wheel pressure described in step 6, normal pressure is 0.6MPa, and the speed of a motor vehicle according to reality adjusts; When design traffic volume be light traffic to medium traffic time, flushing time is chosen as 60min, and when design traffic volume is heavy traffic, flushing time is chosen as 90min, and when design traffic volume is very heavy traffic, flushing time is chosen as 120min.
Coefficient of dispersion described in step 12 should be less than 2%, when coefficient of dispersion does not meet the demands, the data that dispersion degree is larger should be rejected, recalculate cleavage strength mean value and coefficient of dispersion, but should ensure that often organizing test specimen quantity is not less than 3, not meeting aforementioned claim should test by shaping test piece again.
Beneficial effect of the present invention:
Porous asphalt mixture is large due to voidage, is easily subject to the souring repeatedly of wheel load and circulating water and enters the unfreezing of compound internal moisture, and then loose destruction occurs.The invention provides a kind of porous asphalt mixture to wash away indirect tensile test on frozen-thaw whether can not only be used for evaluating the design of porous asphalt mixture reasonable, the water stabilizing of different porous asphalt mixture can be contrasted simultaneously, thus preferably provide favourable help for the design of porous asphalt pavement and material.And compared with the evaluation test of current specifications Asphalt Mixture water stability, the present invention has obvious advantage in following several respects: the practical factors such as the sluicing under constraint condition when (1) test considers porous asphalt pavement generation Moisture Damage, dynamic load by vehicle and dynamic load by vehicle effect, utilize washout test machine, devise a more severe indoor Whole Process Simulation virtual condition, namely wash away Frozen-thawed cycled; (2) wash away pressure, flushing time in test, wash away the key parameters such as freezing-thawing cycles and all in conjunction with actual conditions, can be verified by shop experiment; (3) test findings may be used for the rationality evaluating porous asphalt mixture design, also may be used for the performance comparison of different porous asphalt mixture, thus the rational porous asphalt mixture of preferred properties, ensure the usability of porous asphalt pavement.In a word, the method that the present invention proposes, accurately and reliably, test method is simple and feasible for test figure, is easy to realize, and has very good utilization and extention and is worth.
Accompanying drawing explanation
Fig. 1 is washout test equipment schematic diagram.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention done and further explain.Following embodiment does not limit the present invention in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and is all among protection scope of the present invention.
Porous asphalt pavement is in Long-Time Service process, be vulnerable to the effect of current scour, wheel load, and entering the unfreezing of moisture of compound inside, the loose destruction that therefore porous asphalt pavement causes because water stability is not enough is its typical disease problem.But current Moisture Susceptibility Evaluation is mainly for plain asphalt compound, good specific aim and applicability are not had to porous asphalt mixture, cause porous asphalt mixture water stability to be evaluated not enough, and then cause the generation of pavement disease.Therefore the invention provides a kind of porous asphalt mixture and wash away indirect tensile test on frozen-thaw method.
A kind of porous asphalt mixture provided by the invention washes away indirect tensile test on frozen-thaw method design thinking: because the voidage of the shaping porous asphalt mixture in indoor can strictly control, and its application performance have also been obtained rich experience checking.By the porous asphalt mixture of lab simulation and the compound on actual road surface, there is identical interstitial vacancy state and structure, and then by indoor test specimen simulate actual porous asphalt pavement to wash away that freeze thawing damages be rational, its experimental result may be used for evaluating the water stability of porous asphalt pavement.This method also directly can wash away indirect tensile test on frozen-thaw analysis to the sampling on actual road surface simultaneously, thus judges the actual water stability being in the road surface of different operational phase.
Concrete scheme of the present invention is, first according to actual road surface porous asphalt mixture design bitumen aggregate ratio and grating, utilize the shaping standard marshal piece of indoor compound mixer mix porous asphalt mixture, test specimen quantity is no less than 6, and test specimen is divided into two groups at random, be labeled as the 1st group and the 2nd group respectively.1st group of test specimen directly carries out diametral compression test, to reflect that porous asphalt mixture is not being subject to washing away and strength character during unfreezing, 2nd group of test specimen carries out diametral compression test after completing and washing away Frozen-thawed cycled for twice again, with reflect porous asphalt mixture subjected to wash away with unfreezing after strength character, the average cleavage strength of the average cleavage strength of the 2nd group of test specimen and the 1st group of test specimen is contrasted, and characterize with number percent, to reflect the water stability of the antiscour freeze thawing of porous asphalt mixture.When the average cleavage strength of the 2nd group of test specimen is less compared to the average cleavage strength number percent of the 1st group of test specimen, show that standing the porous asphalt mixture intensity after washing away freeze thawing declines comparatively large, water stability easily occurs in actual use not enough.Following three objects can be reached by such test design:
1. because indoor test specimen and on-the-spot road surface have identical bitumen aggregate ratio and grating, can the gap structure of simulated roadway, pressure is washed away again according to speed of a motor vehicle adjustment, according to volume of traffic adjustment flushing time, current and the coefficient situation of load can be subject to by simulated roadway, make the result of shop experiment have higher rationality and validity.
2. by the test evaluation to same porous asphalt mixture, the rationality of its material composition and mix-design can be verified, verify its usability, by carrying out test evaluation to the porous asphalt mixture with different materials composition and mix-design, the usability of different porous asphalt mixture can be contrasted, thus optimize the superior porous asphalt mixture of water stabilizing, ensure the usability of porous asphalt pavement.
3. indirect tensile test on frozen-thaw is washed away by carrying out porous asphalt mixture to the sampling test specimen on actual road surface, the actual water stability of the porous asphalt pavement of different operational phase can be judged, and then provide favourable foundation for the clear preventive maintenance in time in pavement usage process.
A kind of porous asphalt mixture washes away indirect tensile test on frozen-thaw method, comprises the steps:
Step 1: according to actual road surface porous asphalt mixture design bitumen aggregate ratio and grating, production porous asphalt mixture is mixed and stirred in indoor, attentional manipulation mix temperature, generally at 170 DEG C ~ 190 DEG C, necessary fully mix is even.According to T 0702-2011 compacting process in " highway engineering pitch and Asphalt Mixture Experiment code JTG E20-2011 ", shaping standard marshal piece.Use standard marshal piece, is because its material usage is few, easy to make, is convenient to test.Also the test specimen of shaping other types can be needed according to follow-up performance test.Or directly carry out sampling from actual road surface and obtain test specimen.
Step 2: after step 1 completes, the voidage detecting test specimen, in positive and negative 0.5% scope of design object voidage, gives up test specimen not up to standard; For same porous asphalt mixture, parallel test specimen >=6 of each test, to improve test accuracy.
Step 3: test specimen is divided into two groups at random, is labeled as the 1st group and the 2nd group respectively.
Step 4: the 1st group of test specimen directly carries out diametral compression test according to " highway engineering pitch and Asphalt Mixture Experiment code JTG E20-2011 " T0716-2011, obtains the cleavage strength of the 1st group of test specimen.
Step 5: the 2nd group of test specimen is placed in constant temperature oven, under 25 DEG C ± 1 DEG C condition, insulation is no less than 60min.
Step 6: the test specimen of step 5 good heat insulation is placed in the position that washout test machine washes away 10cm ± 1cm immediately below pressure head, and simulating wheel pressure washes away 60 ~ 120min to test specimen upper surface.Generally calculate with speed of a motor vehicle 80km/h, pressure uses 0.6MPa, but along with the difference of road speed, wheel pressure also has certain change, therefore can adjust wheel pressure according to the road speed of reality.For the selection of flushing time, can select according to the design traffic volume of porous asphalt pavement, when design traffic volume be light traffic to medium traffic time, flushing time can be selected to be 60min, when design traffic volume is heavy traffic, flushing time can be selected to be 90min, when design traffic volume is 120min, flushing time can be selected to be 120min.As shown in Figure 1, whole testing equipment is placed in constant temperature oven 1 washout test equipment schematic diagram, and current are entered by water pipe 10 and are provided with in the aqua storage tank 3 of overflow groove 9; Utilizing booster water pump 2 to improve water outlet pressure, controlling water delivering orifice 6 place pressure by having manometric valve 7; Test test specimen 5 is placed on and washes away in bucket 4, is positioned at immediately below water delivering orifice 6; Wash away bucket to be placed on brace table 8.
Step 7: test specimen step 6 washed away is placed in vacuum drying chamber, keeps 15min, then opens valve under vacuum tightness is 97.3 ~ 98.7kPa condition, recovers normal pressure, test specimen is placed 0.5h in water.
Step 8: the test specimen of step 7 is taken out and puts into polybag, add the water of 10ml, tighten sack, test specimen is put into constant temperature refrigerator, be incubated 16h ± 1h under-18 DEG C ± 2 DEG C conditions.
Step 9: taken out by the test specimen of step 8, puts into the Water Tank with Temp.-controlled of 60 DEG C ± 0.5 DEG C, insulation 24h ± 1h.
Step 10: step 5 ~ 9 are one and wash away Frozen-thawed cycled, that repeats that step 5 ~ 9 complete the 2nd group of test specimen washes away freezing and thawing test the 2nd time.It is 2 times that the standard of this test washes away freezing-thawing cycles, correspondingly can adjust according to actual needs and wash away freezing-thawing cycles.
Step 11: test specimen step 10 completed carries out diametral compression test according to " highway engineering pitch and Asphalt Mixture Experiment code JTGE20-2011 ", obtains the cleavage strength of the 2nd group of test specimen.
Step 12: calculate the cleavage strength mean value of the 1st group of test specimen and the cleavage strength mean value of coefficient of dispersion and the 2nd group of test specimen and coefficient of dispersion; Coefficient of dispersion should be less than 2%, when coefficient of dispersion does not meet the demands, the data that dispersion degree is larger should be rejected, recalculate cleavage strength mean value and coefficient of dispersion, but should ensure that often organizing test specimen quantity is not less than 3, not meeting aforementioned claim should test by shaping test piece again.
Step 13: the average cleavage strength of the average cleavage strength of the 2nd group of test specimen and the 1st group of test specimen is compared, represents with number percent.
A kind of porous asphalt mixture of the present invention washes away indirect tensile test on frozen-thaw method and has obtained good verification experimental verification.
Embodiment 1
According to porous asphalt mixture design bitumen aggregate ratio and grating, according to T 0702-2011 compacting process in " highway engineering pitch and Asphalt Mixture Experiment code JTG E20-2011 ", indoor are mixed and stirred and are produced porous asphalt mixture shaping standard marshal piece, and the design grating of employing, bitumen aggregate ratio and target design voidage are as shown in table 1.
Table 1 asphalt mixture design grating, oilstone when target design voidage
The voidage detecting test specimen, in positive and negative 0.5% scope of design object voidage, is given up test specimen not up to standard, has been prepared 32 marshal pieces met the demands altogether.
Test specimen is divided into 8 groups at random, often organize 4 test specimens, and the constant temperature oven being placed in 25 DEG C is incubated 60min, utilizes washout test machine to wash away with the pressure perpendicular of 0.6Mpa and often organizes surface of test piece, 1st group is washed away 0min, 2nd group is washed away 15min, and the 3rd group is washed away 30min, and the 4th group is washed away 60min, 5th group is washed away 90min, 6th group is washed away 120min, and the 7th group is washed away 180min, and the 8th group is washed away 240min.Then carry out diametral compression test to often organizing test specimen with the loading speed of 50mm/min, and calculate the average cleavage strength often organizing test specimen.The average cleavage strength of 2nd ~ 8 groups of test specimens and the 1st group are compared, characterize with number percent, corresponding result is as shown in table 2.
The test findings of the different flushing time of table 2
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Flushing time/min | 0 | 15 | 30 | 60 | 90 | 120 | 180 | 240 |
| Cleavage strength/Mpa | 0.581 | 0.567 | 0.558 | 0.535 | 0.522 | 0.507 | 0.486 | 0.471 |
| Ratio of split strength/% | 100 | 97.6 | 96.1 | 92.1 | 89.8 | 87.2 | 83.6 | 81.1 |
From result in table, the cleavage strength of test specimen declines gradually along with the increase of flushing time.When determining rational flushing time, two principles should be considered, one is effectively simulate porous asphalt pavement Moisture Damage under Vehicle Load to grow out of nothing the process developed gradually, and flushing time can simulate the destructive power of bituminous pavement generation Moisture Damage in the time limit in serviceable life simultaneously; Two is that shop experiment easily realizes, and flushing time is long, more obvious to the mechanical damage of test specimen, to the rationality of test figure and authenticity unfavorable, simultaneously also more obvious to the damage of washing away testing machine.To sum up, in the present invention, flushing time gets 60min ~ 120min is rational.
Embodiment 2
According to porous asphalt mixture design bitumen aggregate ratio and grating, according to T 0702-2011 compacting process in " highway engineering pitch and Asphalt Mixture Experiment code JTG E20-2011 ", indoor are mixed and stirred and are produced porous asphalt mixture shaping standard marshal piece, and the design grating of employing, bitumen aggregate ratio and target design voidage are as shown in table 3.
Table 3 asphalt mixture design grating, oilstone when target design voidage
The voidage detecting test specimen, in positive and negative 0.5% scope of design object voidage, is given up test specimen not up to standard, has been prepared 32 marshal pieces met the demands altogether.
Test specimen is divided into 8 groups at random, often organizes 4 test specimens.1st group of test specimen directly carries out diametral compression test.The constant temperature oven that 2nd group of test specimen is placed in 25 DEG C is incubated 60min, and recycling washout test machine washes away surface of test piece 60min with the pressure perpendicular of 0.6Mpa, carries out diametral compression test afterwards.3 to 8 group test specimen carries out 1 time respectively, 2 times, 4 times, 6 times, washes away Frozen-thawed cycled, carries out diametral compression test afterwards for 8 times and 10 times, and each Frozen-thawed cycled detailed process of washing away is as follows: the constant temperature oven that test specimen is placed in 25 DEG C is incubated 60min; Washout test machine is utilized to wash away surface of test piece 60min with the pressure perpendicular of 0.6Mpa the test specimen of good heat insulation; The test specimen washed away is kept 15min under vacuum tightness is 97.3 ~ 98.7kPa condition, then opens valve, recover normal pressure, test specimen is placed 0.5h in water; Again test specimen is taken out and put into polybag, add the water of 10ml, tighten sack, test specimen is put into constant temperature refrigerator, under-18 DEG C of conditions, be incubated 16h; Afterwards test specimen is taken out, put into the Water Tank with Temp.-controlled of 60 DEG C, insulation 24h.Often group gets the mean value of cleavage strength as final test findings, and the cleavage strength of the cleavage strength of the 2 to 8 group and the 1st group is compared, and represent with number percent, corresponding result is as shown in table 4.
Table 4 difference washes away the test findings of freezing-thawing cycles
From data in table, along with the increase of washing away freezing-thawing cycles, the cleavage strength of test specimen reduces gradually, when washing away Frozen-thawed cycled 2 times, it is maximum that cleavage strength reduces amplitude, and occurred obvious loose phenomenon, after washing away freeze thawing 10 times, test specimen is complete loose damage.The selection principle washing away freezing-thawing cycles should occur obvious destruction sign by test specimen, and cleavage strength declines obvious, but it is too serious that test specimen can not be allowed to destroy, and too seriously for asphalt mixture design, has lacked good reference value.Therefore, washing away freezing-thawing cycles in this test, to get 2 times be rational, can do corresponding adjustment according to actual needs simultaneously.
Application example shows, a kind of porous asphalt mixture provided by the invention washes away indirect tensile test on frozen-thaw method, data accurately and reliably, easy to operate feasible, be easy to realize, what accurately can judge porous asphalt mixture washes away freeze-thaw stability, thus is the design of porous asphalt mixture, performance comparison and Pavement Performance judge to provide reliable basis with maintenance, and then ensure the usability of porous asphalt mixture.Therefore, method for testing and detecting of the present invention has very good application and popularization value.
Claims (4)
1. porous asphalt mixture washes away an indirect tensile test on frozen-thaw method, it is characterized in that, comprises the steps:
Step 1: according to porous asphalt mixture design bitumen aggregate ratio and grating, according to T 0702-2011 compacting process in " highway engineering pitch and Asphalt Mixture Experiment code JTG E20-2011 ", indoor are mixed and stirred and are produced porous asphalt mixture and shaping test piece; Or directly carry out sampling from actual road surface and obtain test specimen;
Step 2: after step 1 completes, the voidage detecting test specimen, in positive and negative 0.5% scope of design object voidage, gives up test specimen not up to standard; For same porous asphalt mixture, parallel test specimen >=6 of each test;
Step 3: test specimen is divided into two groups at random, is labeled as the 1st group and the 2nd group respectively;
Step 4: the 1st group of test specimen directly carries out diametral compression test according to " highway engineering pitch and Asphalt Mixture Experiment code JTG E20-2011 ", obtains the cleavage strength of the 1st group of test specimen;
Step 5: the 2nd group of test specimen is placed in constant temperature oven, under 25 DEG C ± 1 DEG C condition, insulation is no less than 60min;
Step 6: the test specimen of step 5 good heat insulation is placed in the position that washout test machine washes away 10cm ± 1cm immediately below pressure head, and simulating wheel pressure washes away 60 ~ 120min to test specimen upper surface;
Step 7: test specimen step 6 washed away is placed in vacuum drying chamber, keeps 15min, then opens valve under vacuum tightness is 97.3 ~ 98.7kPa condition, recovers normal pressure, test specimen is placed 0.5h in water;
Step 8: the test specimen of step 7 is taken out and puts into polybag, add water, tighten sack, test specimen is put into constant temperature refrigerator, be incubated 16h ± 1h under-18 DEG C ± 2 DEG C conditions;
Step 9: taken out by the test specimen of step 8, puts into the Water Tank with Temp.-controlled of 60 DEG C ± 0.5 DEG C, insulation 24h ± 1h;
Step 10: step 5 ~ 9 are one and wash away Frozen-thawed cycled, that repeats that step 5 ~ 9 complete the 2nd group of test specimen washes away freezing and thawing test the 2nd time; Correspondingly freezing-thawing cycles is washed away in adjustment according to actual needs;
Step 11: test specimen step 10 completed carries out diametral compression test according to " highway engineering pitch and Asphalt Mixture Experiment code JTGE20-2011 ", obtains the cleavage strength of the 2nd group of test specimen;
Step 12: calculate the cleavage strength mean value of the 1st group of test specimen and the cleavage strength mean value of coefficient of dispersion and the 2nd group of test specimen and coefficient of dispersion;
Step 13: the average cleavage strength of the average cleavage strength of the 2nd group of test specimen and the 1st group of test specimen is compared, represents with number percent.
2. a kind of porous asphalt mixture according to claim 1 washes away indirect tensile test on frozen-thaw method, it is characterized in that, shaping test piece described in step 1 is shaping standard marshal piece.
3. a kind of porous asphalt mixture according to claim 1 washes away indirect tensile test on frozen-thaw method, it is characterized in that, the simulating wheel pressure described in step 6, and normal pressure is 0.6MPa, and the speed of a motor vehicle according to reality adjusts; When design traffic volume be light traffic to medium traffic time, flushing time is chosen as 60min, and when design traffic volume is heavy traffic, flushing time is chosen as 90min, and when design traffic volume is very heavy traffic, flushing time is chosen as 120min.
4. a kind of porous asphalt mixture according to claim 1 washes away indirect tensile test on frozen-thaw method, it is characterized in that, coefficient of dispersion described in step 12 should be less than 2%, when coefficient of dispersion does not meet the demands, the data that dispersion degree is larger should be rejected, recalculate cleavage strength mean value and coefficient of dispersion, but should ensure that often organizing test specimen quantity is not less than 3, not meeting aforementioned claim should test by shaping test piece again.
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| CN108627393A (en) * | 2018-02-02 | 2018-10-09 | 北京建筑大学 | A kind of water stability test method of macrovoid high molecular polymer mixture |
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| CN105067420A (en) * | 2015-07-31 | 2015-11-18 | 长安大学 | Method for evaluating durability of thin layer asphalt mixture cover |
| CN105067420B (en) * | 2015-07-31 | 2018-12-18 | 长安大学 | A kind of evaluation method of thin-layer bituminous mixture cover durability |
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| CN108181451A (en) * | 2018-02-01 | 2018-06-19 | 张中华 | The device and method that performance of asphalt mixture influences under a kind of assessment Frozen-thawed cycled |
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| CN108871937B (en) * | 2018-06-25 | 2020-10-13 | 广西交通设计集团有限公司 | Test method for testing water stability of asphalt concrete |
| CN109142005A (en) * | 2018-10-08 | 2019-01-04 | 山西省交通科学研究院 | A kind of Evaluation in Water Damage of Asphalt Mixture |
| CN109142005B (en) * | 2018-10-08 | 2020-11-27 | 山西省交通科技研发有限公司 | Method for evaluating water stability of asphalt mixture |
| CN111781055A (en) * | 2019-03-18 | 2020-10-16 | 山东高速集团有限公司 | Improved freeze-thaw splitting test method for drainage asphalt mixture |
| 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 |
| CN111562153A (en) * | 2020-06-09 | 2020-08-21 | 江苏中亿通道路新材料有限公司 | Method for evaluating water stability of asphalt mixture |
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