CN104062159B - A kind of porous asphalt mixture gap blocks test method - Google Patents
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Abstract
The present invention discloses a kind of porous asphalt mixture gap and blocks test method, and first design level according to actual road surface is joined and bitumen aggregate ratio, and porous asphalt mixture is mixed and stirred and shaping test piece in indoor, and wax seals test specimen lower surface. Evenly pave obstruction dust at upper surface subsequently, it may also be useful to the pressure that the wheel load that washout test machine is corresponding according to road surface actual vehicle speed acts on road surface washes away test specimen upper surface. The obstruction dust quality being removed the obstruction dust quality taken away by current and upper surface residual by the obstruction dust total mass paved obtains blocking the obstruction dust quality in test specimen inside. The inventive method is possible not only to the obstruction dust granules of the different size of scientifically evaluation to the congestion situations of porous asphalt pavement, for Street surface cleaning maintenance provides good foundation, different condition such as voidage, the speed of a motor vehicle, obstruction dust granules particle diameter etc. can be analyzed simultaneously and affect effect to what porous asphalt pavement blocked, thus provide reasonable reference for the optimization of maintenance of surface, it is to increase clean the effect of maintenance.
Description
Technical field
The present invention relates to asphalt highway maintenance technology field, it is specifically related to a kind of porous asphalt mixture gap and blocks test method.
Background technology
Porous asphalt pavement (Porousasphaltpavement) uses the bigger asphalt of voidage for top layer, road surface as layer of displacement, at its lower dense-graded mix of laying as watertight layer, and the pavement structure of water-proof tack coat is set between layer of displacement and watertight layer. The voidage of the porous asphalt mixture of this kind of pavement structure use is generally between 18% to 25%, adopt gap grading, compound is formed bigger voidage and more connectivity gap, rainwater on road surface can be discharged rapidly, it is to increase the drainage performance on road surface.
Porous asphalt pavement originates from Germany, and nineteen sixty, first Germany employed this kind of material construction road surface, and at the end of the seventies, porous asphalt pavement is widely used in American-European countries. At present, France has spread the porous asphalt pavement built more than 2,000 ten thousand, and the annual new paving porous asphalt pavement of Holland is more than 3,000,000 so that it is domestic main roads are transformed into porous asphalt pavement substantially. The U.S. is in order to improve the anti-sliding security on road surface, and many state pavings have built porous asphalt pavement, and the TRB meeting that early 1990s holds in Washington mainly discusses the use of drainage asphalt material. Japan brings into use porous asphalt pavement in the later stage eighties, achieves good result of use. In recent years, China also starts to promote the use of porous asphalt pavement, such as Beijing-Shanghai Expressway Cangzhou section, with high mountain high speed road test section, the main road, the Five continents in Shanghai, the airport expressway etc. in Xi'an.
Porous asphalt pavement is called as PorousAsphalt in Europe, i.e. macrovoid or drainage road, and the U.S. is then called OpenGradedAsphaltFrictionCourse, is called for short OGFC, i.e. open gradation asphalt wearing layer. Owing to porous asphalt pavement material void rate is big, making this kind of road surface have good anti-acoustic capability and temperature reduction performance, its cling property and permeability performance are also far better than the road surface that the compound pavings such as SMA, AC are built simultaneously.Therefore, porous asphalt pavement is worldwide more and more paid attention to.
But porous asphalt mixture adopts big gap structure due to itself, and in use space is easily subject to the impact that dust granules blocks, it is the porous asphalt pavement problem more outstanding relative to traditional asphalt road surface that space is blocked. The pavement performance key of porous asphalt pavement depends on its higher voidage and the existence of connectivity gap, in pavement usage process, due to load, rainwater wash away, the effect such as temperature Change, space in road surface can produce the decay in spatial shape, compound void quantity reduces, and connectivity gap rate declines, and the decay in space is directly connected to the draining ability on road surface, therefore, the space obstruction rule of research and evaluation porous asphalt mixture is significant.
Summary of the invention
It is an object of the present invention to provide a kind of porous asphalt mixture gap and block test method, by the congestion situations of Laboratory Evaluation porous asphalt mixture, it is possible to judge porous asphalt pavement congestion situations in use simply and easily.
The present invention is by the following technical solutions:
A kind of porous asphalt mixture gap blocks test method, comprises the steps:
Step 1: join according to porous asphalt mixture design bitumen aggregate ratio and level, according to T0702-2011 compacting process in " highway engineering pitch and asphalt testing regulation " JTGE20-2011, 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 of detection test specimen, in positive and negative 0.5% scope of design objective voidage, gives up test specimen not up to standard; For same porous asphalt mixture, often organize parallel test specimen >=3 of test;
Step 3: test specimen lower surface is evenly sealed one layer of paraffin;
Step 4: the test specimen upper surface obtained in step 3 evenly spreads paving obstruction dust, writes down the obstruction dust total mass spreading paving and is designated as a;
Step 5: use can regulate hydraulic pressure wash away hydraulic giant or small-sized test pump, simulating wheel pressure washes away the upper surface of the test specimen that step 4 obtains, and no longer includes considerable change when upper surface blocks dust quantity, and time limpid through the water quality of test specimen, scour process completes;
Step 6: after step 5 completes, collects the water through test specimen, weighs obstruction dust quality wherein and be designated as b, be the obstruction dust quality through porous asphalt mixture after oven dry; After the standing nature of test specimen dries, cleaning test specimen upper surface with hairbrush and collect test specimen upper surface residue obstruction dust, weighing quality is designated as c, is the obstruction dust quality remaining in porous asphalt mixture upper surface;
Step 7: the obstruction dust total mass a paved subtracts the obstruction dust quality b through porous asphalt mixture and remains in the obstruction dust quality c of porous asphalt mixture upper surface, is the obstruction dust quality being blocked in porous asphalt mixture inside, is designated as d.
Shaping test piece described in step 1 is shaping standard marshal piece.
Test specimen lower surface described in step 3 evenly seals one layer of paraffin concrete steps: heat solid paraffin to 60 DEG C in pan, make it to melt for liquid, keep thick, test specimen lower surface is put into paraffin gently, slowly take out after making it to adhere to one layer of paraffin, naturally cooling to paraffin, test specimen lower surface evenly seals one layer of paraffin.
Block described in step 4 dust be the obstruction dust in the actual use procedure in road surface or according to test needs indoor configuration; The thickness spreading paving is 1mm��5mm.
The useful effect of the present invention:
The outstanding problem being porous asphalt pavement in use is blocked in the space of porous asphalt mixture, and congestion situations is related to the cleaning maintenance measure of porous asphalt pavement. If the particle blocked in porous asphalt pavement can not be eliminated timely and effectively, the drainage performance of road surface entirety will be greatly affected, and reduce the pavement performance of porous asphalt pavement. The present invention provides a kind of porous asphalt mixture gap to block test method, the obstruction dust granules being possible not only to the different size of scientifically evaluation is to the congestion situations of porous asphalt pavement, for Street surface cleaning maintenance provides good foundation, different condition such as voidage, the speed of a motor vehicle, obstruction dust granules particle diameter etc. can be analyzed simultaneously and affect effect to what porous asphalt pavement blocked, thus provide reasonable reference for the optimization of maintenance of surface, it is to increase clean the effect of maintenance. In a word, the method that the present invention proposes, accurately and reliably, test method is simple and feasible for testing data, is easy to realize, and has very good utilization and extention and is worth.
Accompanying drawing explanation
Fig. 1 is the marshal piece figure that the lower surface wax envelope used in embodiment 1 and upper surface do not have wax to seal.
Fig. 2 is that in embodiment 1, every grade of particle diameter blocks dust granules obstruction percentage test-results figure.
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, and all employings are equal to the technical scheme that the mode of replacement or equivalent transformation obtains, and are all among protection scope of the present invention.
Porous asphalt pavement, in life-time service process, is subject to the effect of current scour, wheel load, and on road surface, the dust granules thing of different sizes of accumulation can block and enters pavement structure, and it is the distinctive maintenance problem of porous asphalt pavement that space is blocked. The space of porous asphalt pavement must ensure smooth and easy, thus plays the drainage performance that it is excellent. But the obstruction research for porous asphalt mixture is still in the starting stage, also not relevant scientific experimentation method at present, and this also causes the space of porous asphalt mixture to clean maintenance plan cannot scientific arrangement. Therefore the present invention provides a kind of porous asphalt mixture gap obstruction test method.
A kind of porous asphalt mixture gap provided by the invention blocks the mentality of designing of test method: owing to the voidage of the shaping porous asphalt mixture in indoor can strictly control, and its application performance have also been obtained rich experience checking. Be there is identical space state and structure by the compound of the porous asphalt mixture of lab simulation He actual road surface, and then the congestion situations by the indoor test specimen actual porous asphalt pavement of simulation is rational, its experimental result may be used for predicting the obstruction rule of porous asphalt pavement. The sampling on actual road surface directly can also be carried out space blocking test analysis by present method simultaneously, thus judges to be in the actual space stopping state on the road surface in different use stage.
The concrete scheme of the present invention is, first design level according to actual road surface is joined and bitumen aggregate ratio, utilizes indoor compound amalgamator to mix and closes the shaping standard marshal piece of porous asphalt mixture, the demoulding wax envelope test specimen lower surface. Evenly pave obstruction dust at upper surface subsequently, it may also be useful to the pressure that the wheel load that washout test machine is corresponding according to road surface actual vehicle speed acts on road surface washes away surface of test piece, can reflect the impact that space is blocked by current and wheel load acting in conjunction. For the acquisition of congestion situations, it is that the obstruction dust quality that obstruction dust total mass by paving removes obstruction dust quality and the remained on surface taken away by current obtains blocking the obstruction dust quality in test specimen inside. The obstruction dust quality that current are taken away can not be blocked in an inner powder dust quality by test specimen space, the obstruction dust quality of remained on surface is then the obstruction dust granules that can not enter in pavement structure under souring, such obstruction dust granules also can not block space, road surface, and only calculating the obstruction dust granules quality remaining in test specimen inside could the real space stopping state dividing analyzing porous asphalt mixture. Following three objects can be reached by such test design:
1. due to indoor test specimen with on-the-spot road surface has identical bitumen aggregate ratio and level is joined, the gap structure on road surface can be simulated, pressure is washed away again, it is possible to simulation road surface is subject to current and the situation of load acting in conjunction, makes the result of shop experiment have higher reasonableness and validity according to speed of a motor vehicle adjustment.
2. obstruction dust granules composition can be designed, it is possible not only to the stopping state of point analyzing porous asphalt mixture, which type of obstruction dust can be judged to analyze simultaneously and more easily block porous asphalt mixture, thus obtain the crucial obstruction dust granules particle diameter of clearance of porous asphalt pavement blocking, and then the actual blockage situation of prediction porous asphalt pavement.
3. pass through the sampling test specimen on actual road surface and actual obstruction dust test, it can be determined that the actual blockage situation of the porous asphalt pavement in different use stage, and then it is the offer theoretical foundation of the cleaning maintenance in pavement usage process.
A kind of porous asphalt mixture gap blocks test method, comprises the steps:
Step 1: joining according to actual road surface porous asphalt mixture design bitumen aggregate ratio and level, production porous asphalt mixture is mixed and stirred in indoor, it is noted that conjunction temperature is mixed in control, generally at 170 DEG C��190 DEG C, it may also be useful to asphalt modifier, it is necessary to fully mixes and closes evenly. According to T0702-2011 compacting process in " highway engineering pitch and asphalt testing regulation " JTGE20-2011, shaping standard marshal piece. Use standard marshal piece, is because its material usage is few, easy to make, is convenient to test, can also carry out performance test further after blocking test simultaneously. The test specimen of other types shaping can also 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 of detection test specimen, in positive and negative 0.5% scope of design objective voidage, gives up test specimen not up to standard; For same porous asphalt mixture, often organize parallel test specimen >=3 of test, to improve test accuracy.
Step 3: heat solid paraffin to 60 DEG C in pan, make it to melt for liquid, keep thick, test specimen lower surface is put into paraffin gently, slowly take out after making it to adhere to one layer of paraffin, naturally cooling to paraffin, test specimen lower surface evenly seals one layer of paraffin, it is noted that try not to make test specimen side be stained with paraffin. Wax envelope test specimen lower surface must be guaranteed completely waterproof. In addition, if Parafilm sticks at test specimen side accidentally, its adhesion highly should not be greater than 3mm. Why to test specimen lower surface wax seal, it it is the drainage situation in order to simulate in actual porous asphalt pavement structure, actual porous asphalt pavement structure can be laid adhesion coating and watertight layer in porous asphalt mixture layer bottom, so that the water entering porous asphalt mixture is out-of-bounds discharged along road level direction to road, therefore, test specimen lower surface is carried out wax seal by simulation test so that current from the draining of test specimen side with simulating actual conditions.
Step 4: the test specimen upper surface obtained in step 3 evenly spreads paving obstruction dust, writes down the obstruction dust total mass spreading paving and is designated as a; Block dust and can get the obstruction dust in the actual use procedure in road surface, indoor configuration can also be carried out according to test needs, when surface of test piece spreads paving, the obstruction dust total mass paved is advisable to form a uniform fold thin layer in surface of test piece, the thickness spreading paving is generally 1mm��5mm, ensure that surface of test piece is evenly paved with, according to the size of particle, spread paving thickness slightly different. And to be ensured when carrying out parallel test that the obstruction dust quality that each surface of test piece paves is identical with thickness.
Step 5: use can regulate hydraulic pressure wash away hydraulic giant or small-sized test pump, simulating wheel pressure washes away the upper surface of the test specimen that step 4 obtains, and no longer includes considerable change when upper surface blocks dust quantity, and time limpid through the water quality of test specimen, scour process completes.Wash away hydraulic giant and small-sized test pump all should have and can adjust the valve of hydraulic pressure and tensimeter and the shower nozzle of adjustable water outlet degree of scatter. Wash away hydraulic giant and current dispersion that small-sized test pump should make shower nozzle spray is washed away, in order to avoid the obstruction dust paved is uneven and depart from surface of test piece at concentrated hydraulic pressure lower stress, cause the loss blocking dust quality. Wash away pressure and can consider 0.7Mpa, this pressure be standard wheel equivalent loading action in the pressure on road surface, when the speed of a motor vehicle changes, this pressure also can change to some extent, for different tests, can with reference to road surface actual vehicle speed change wash away pressure.
Step 6: after step 5 completes, collects the water through test specimen, weighs obstruction dust quality wherein and be designated as b, be the obstruction dust quality through porous asphalt mixture after oven dry; After the standing nature of test specimen dries, cleaning test specimen upper surface with hairbrush and collect test specimen upper surface residue obstruction dust, weighing quality is designated as c, is the obstruction dust quality remaining in porous asphalt mixture upper surface.
Step 7: the obstruction dust total mass a paved subtracts the obstruction dust quality b through porous asphalt mixture and remains in the obstruction dust quality c of porous asphalt mixture upper surface, it is the obstruction dust quality being blocked in porous asphalt mixture inside, it is designated as d, also it is d=a-b-c. Namely this test-results can be used for analyzing the space stopping state of porous asphalt mixture. The obstruction dust mass percent being blocked in porous asphalt mixture gap inside can be calculated, thus analyze the stopping state in space. Both the obstruction dust that can contrast different composition is to the congestion situations of same porous asphalt mixture, it is also possible to same is blocked the usable condition that dust blocks by the different porous asphalt mixture of comparative analysis.
Embodiment 1
A kind of porous asphalt mixture gap of the present invention blocks test method and has obtained good verification experimental verification. The engineering that test relies on is the porous asphalt pavement section laid between the pile No. K2+900 K3+300 of southern side, main road, the Five continents, Shanghai, joins to mix with target design voidage indoor according to its design bitumen aggregate ratio, level and closes porous compound and shaping test piece. The obstruction dust granules of the different size of test method analysis applying this experiment is to its space congestion situations, and concrete implementation step is as follows:
Step 1: bitumen aggregate ratio and level according to porous asphalt mixture are joined, according to T0702-2011 compacting process in " highway engineering pitch and asphalt testing regulation " JTGE20-2011, indoor are mixed and stirred and are produced porous asphalt mixture shaping standard marshal piece, the design level of employing is joined, bitumen aggregate ratio and target design voidage as shown in table 1.
Table 1 mixture gradation and target design voidage
Step 2: after step 1 completes, the voidage of detection test specimen, in positive and negative 0.5% scope of design objective voidage, gives up test specimen not up to standard, has prepared 21 altogether and has met the marshal piece required.
Step 3: heat solid paraffin to 60 DEG C in pan, make it to melt for liquid, keep thick, test specimen lower surface is put into paraffin gently, slowly take out after making it to adhere to one layer of paraffin, naturally cooling to paraffin, test specimen lower surface evenly seals one layer of paraffin, it is noted that try not to make test specimen side be stained with paraffin. Wax envelope test specimen lower surface must be guaranteed completely waterproof. In addition, if Parafilm sticks at test specimen side accidentally, its adhesion highly should not be greater than 3mm, and the marshal piece that wax is honored as a queen is as shown in Figure 1.
Step 4: the aggregate particle of below particle diameter 4.75mm is carried out a point shelves screening, it is divided into 7 grades according to size, i.e. < 0.075mm, 0.075-0.15mm, 0.15-0.3mm, 0.3-0.6mm, the aggregate particle of seven grades of different-grain diameter sizes of 0.6-1.18mm, 1.18-2.36mm, 2.36-4.75mm, to simulate the obstruction dust with different-grain diameter size, the obstruction dust analyzing different-grain diameter size is to the congestion situations of the porous asphalt mixture of preparation. For the obstruction dust of every grade of particle diameter, get 3 marshal pieces and carry out replica test, evenly spread paving at each test specimen upper surface and block dust, form a uniform fold thin layer at test specimen upper surface to be advisable, the thickness spreading paving is 1mm��5mm, finally determine that spreading paving 4g in each surface of test piece blocks dust, also namely each surface of test piece to spread paving total mass a be 4g.
Step 5: use can regulate hydraulic pressure and water outlet degree of scatter wash away hydraulic giant, simulating wheel pressure washes away test specimen upper surface, the pressure that washes away that this test adopts is 0.7MPa, process of the test noting, the obstruction dust that control paves does not depart from surface of test piece under hydraulic pressure, obstruction dust is made to enter porous asphalt mixture under the effect washing away pressure, block dust quantity when surface and no longer include considerable change, and when the water quality passing through test specimen is limpid, scour process completes.
Step 6: after step 5 completes, collect the water through test specimen, weigh wherein remaining obstruction dust quality after oven dry and it is designated as b, it is the obstruction dust quality through porous asphalt mixture, after the standing nature of test specimen dries, cleaning upper surface with hairbrush and collect upper surface residue obstruction dust, weighing quality is designated as c, being and remain in the obstruction dust quality that porous asphalt mixture upper surface does not enter porous asphalt mixture, the logging of the obstruction dust of every grade of particle diameter is as shown in table 2.
Step 7: the obstruction dust total mass a paved subtracts the obstruction dust quality b through porous asphalt mixture and remains in the obstruction dust quality c on porous asphalt mixture surface, it is the obstruction dust quality being blocked in porous asphalt mixture inside, it is designated as d, also being d=a-b-c, the logging of the obstruction dust of every grade of particle diameter is as shown in table 2.
Table 2 blocks test-results
| Different-grain diameter dust | <0.075 | 0.075-0.15 | 0.15-0.3 | 0.3-0.6 | 0.6-1.18 | 1.18-2.36 | 2.36-4.75 |
| a(g) | 4.00 | 4.00 | 4.00 | 4.00 | 4.00 | 4.00 | 4.00 |
| b(g) | 3.24 | 3.36 | 3.27 | 2.99 | 1.45 | 1.24 | 0.09 |
| c(g) | 0.21 | 0.29 | 0.38 | 0.40 | 0.99 | 1.16 | 3.78 5 --> |
| d(g) | 0.56 | 0.35 | 0.35 | 0.62 | 1.57 | 1.60 | 0.13 |
| Block percentage (%) | 13.9 | 8.7 | 8.8 | 15.5 | 39.3 | 40.0 | 3.3 |
Based on the test-results of step 7, calculate every grade of particle diameter to block the quality that dust is blocked in porous asphalt mixture inside and account for pave and block the percentage of dust total mass, it is every grade of particle diameter and blocks the obstruction percentage of dust in porous asphalt mixture, record as shown in table 2.
Based on the test-results of step 7, dust is blocked for every grade of particle diameter, calculate the ratio (representing with per-cent) of obstruction dust quality d and the total mass a blocking dust that paves remaining in porous asphalt mixture inside, obtain every grade of particle diameter and block dust to the obstruction percentage of porous asphalt mixture, as shown in table 2, and the test-results of every grade of obstruction percentage blocking dust is drawn in Fig. 2, thus can observe and obtain every grade of obstruction dust to the obstruction severity of porous asphalt mixture, and can find porous asphalt mixture is blocked the most serious obstruction dust size by contrast, and it can be used as crucial obstruction dust size.
As can be seen from the test-results of table 2 and Fig. 2; cause voidage be about 20% porous asphalt mixture block obstruction dust size peak value be 0.6-1.18mm and 1.18-2.36mm two grades block dust granules; two grades are blocked dust granules and all have the particle of 40% can enter porous asphalt mixture and remain in porous asphalt mixture, illustrate that particle diameter is the porous asphalt mixture that the obstruction dust granules of 0.6mm-2.36mm the most easily enters voidage about 20%.According to the research about gap structure, the porous asphalt mixture test specimen space mean diameter of voidage about 20% is about 4mm, but owing to aperture diameter is in the ununiformity of spatial distribution, the aperture diameter of test specimen inside can reduce greatly, it is inner and remain in surface that the particle (2.36mm-4.75mm) causing particle diameter bigger cannot enter test specimen, as can be seen from Figure 2 only have an appointment 3% the obstruction dust granules of 2.36mm-4.75mm be blocked in porous asphalt mixture. On the other hand, the particle that particle diameter is less can be flowed out with water by connectivity gap, although there is semi-connected hole in test specimen inside and the very little space of diameter is blocked by small size particle, cause the particle being less than 0.6mm particle diameter in various degree remain in test specimen inside, but these quality comparation blocked are little, it it not the crucial particle diameter causing porous asphalt mixture to block, as can be seen from Figure 2, obstruction dust granules particle diameter being less than to 0.6mm, maximum only have the obstruction dust of 15% can be blocked in porous asphalt mixture. Therefore, it is maximum that particle diameter is in the degree that porous asphalt mixture blocks by the obstruction dust granules of the 0.6mm-2.36mm of middle portion, is the crucial particle diameter causing the porous asphalt mixture of voidage about 20% to block.
Application example shows, a kind of porous asphalt mixture provided by the invention blocks test method, data are accurately and reliably, easy to operate feasible, it is easy to realize, can accurately reflect the different impact blocked dust granules particle diameter and blocked by porous asphalt mixture, thus the cleaning maintenance offer reliable basis for porous asphalt pavement, and then ensure good pavement performance. Therefore, the method for testing and detecting of the present invention has very good application and popularization value.
Claims (1)
1. a porous asphalt mixture gap blocks test method, it is characterised in that, comprise the steps:
Step 1: bitumen aggregate ratio and design level according to porous asphalt mixture are joined, according to T0702-2011 compacting process in " highway engineering pitch and asphalt testing regulation " JTGE20-2011, indoor are mixed and stirred and are produced porous asphalt mixture shaping standard marshal piece, and the design level of employing is joined, bitumen aggregate ratio and target design voidage see the following form:
Step 2: after step 1 completes, the voidage of detection test specimen, in positive and negative 0.5% scope of target design voidage, gives up test specimen not up to standard; Prepare 21 altogether and meet the marshal piece required;
Step 3: test specimen lower surface is evenly sealed one layer of paraffin, concrete steps are: heat solid paraffin to 60 DEG C in pan, make it to melt for liquid, keep thick, test specimen lower surface is put into paraffin gently, slowly taking out after making it to adhere to one layer of paraffin, naturally cool to paraffin, test specimen lower surface evenly seals one layer of paraffin;
Step 4: the aggregate particle of below particle diameter 4.75mm is carried out a point shelves screening, it is divided into 7 grades according to size, i.e. < 0.075mm, 0.075-0.15mm, 0.15-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm, 2.36-4.75mm the aggregate particle of seven grades of different-grain diameter sizes, to simulate the obstruction dust with different-grain diameter size, the obstruction dust analyzing different-grain diameter size is to the congestion situations of the porous asphalt mixture of preparation, for the obstruction dust of every grade of particle diameter, get 3 marshal pieces and carry out replica test, evenly spread paving at each test specimen upper surface and block dust, a uniform fold thin layer is formed at test specimen upper surface, the thickness spreading paving is 1mm��5mm, finally determine that spreading paving 4g at each test specimen upper surface blocks dust, also namely each test specimen upper surface to spread paving total mass a be 4g,
Step 5: use can regulate hydraulic pressure and water outlet degree of scatter wash away hydraulic giant, simulating wheel pressure washes away the upper surface of the test specimen that step 4 obtains, the pressure that washes away adopted is 0.7MPa, considerable change is no longer included when upper surface blocks dust quantity, and time limpid through the water quality of test specimen, scour process completes;
Step 6: after step 5 completes, collects the water through test specimen, weighs wherein remaining obstruction dust quality and be designated as b, be the obstruction dust quality through porous asphalt mixture after oven dry; After the standing nature of test specimen dries, cleaning test specimen upper surface with hairbrush and collect test specimen upper surface residue obstruction dust, weighing quality is designated as c, is and remains in the obstruction dust quality that porous asphalt mixture upper surface does not enter porous asphalt mixture;
Step 7: the obstruction dust total mass a spreading paving subtracts the obstruction dust quality b through porous asphalt mixture and remains in the obstruction dust quality c of porous asphalt mixture upper surface, it is the obstruction dust quality being blocked in porous asphalt mixture inside, it is designated as d, also it is d=a-b-c;
Based on the test-results of step 7, calculate every grade of particle diameter and block the quality that dust is blocked in porous asphalt mixture inside and account for the percentage spreading paving and blocking dust total mass, be every grade of particle diameter and block the obstruction percentage of dust in porous asphalt mixture.
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