CN105806776A - Device and method for testing skid resistance of asphalt mixture in damp state - Google Patents
Device and method for testing skid resistance of asphalt mixture in damp state Download PDFInfo
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- CN105806776A CN105806776A CN201610158972.2A CN201610158972A CN105806776A CN 105806776 A CN105806776 A CN 105806776A CN 201610158972 A CN201610158972 A CN 201610158972A CN 105806776 A CN105806776 A CN 105806776A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The invention discloses a device and method for testing the skid resistance of an asphalt mixture in a damp state. The device comprises a slope-adjustable first base. A test piece containing groove (5) is formed in the upper surface of the first base, a swing value tester (4) is fixedly arranged at the position, in the test piece containing groove (5), of the upper surface of the first base, an asphalt mixture test piece (6) is placed between two fixing legs of the swing value tester (4), the lower surface of a swing head (20) of the swing value tester (4) makes contact with the upper surface of the asphalt mixture test piece (6), and a water storage tank (2) used for simulating rainfall is arranged above one end of the asphalt mixture test piece (6). By means of the device and method for testing the skid resistance of the asphalt mixture in a damp state, the skid resistance of the asphalt mixture in a damp state can be quantitatively evaluated, and a basis can be provided for improving the safety of an asphalt pavement on rainy days.
Description
Technical field
The present invention relates to the test device and method of asphalt antiskid performance under dampness, belong to detection and the assessment technique field of asphalt serviceability.
Background technology
Along with flourish and national road network perfect gradually of Modern Road Transportation cause, Chinese Highway building cause achieves significant progress, ends for the end of the year 2014, and whole nation highway total kilometrage reaches 11.2 ten thousand kilometers.In the built highway being open to traffic, bituminous paving accounts for the overwhelming majority.Substantially meeting under the present situation of demand at the network of communication lines, people's road pavement performance requirement is also more and more higher.And a prominent performance is exactly antiskid performance in road surface, one of its key property being not only pavement usage, or affect the key factor of traffic safety.The adhesion property of tire and road surface can be improved in the road surface of antiskid function admirable, thus reducing defective steering stabilizer, it is to avoid the hidden danger of some vehicle accidents.A large amount of datas show, the wet road surface under rainy weather can cause road accident to increase, and along with the decline of Bitumen Pavement Anti-Skid Performance, accident rate exponentially type increases.Therefore considering from the angle of traffic safety, the antiskid performance under test asphalt dampness has important practical significance.
The equipment being currently used for detection pavement skid resistance condition is broadly divided into two kinds, a kind of detection surface friction coefficient, another kind of detection road table construction depth.But, there is many defects in existing method of testing and detection equipment.Such as the manual sand patch method at China's popularity, it it is a kind of method detecting road table construction depth.This method is big due to personal error, can cause that test result deviation is bigger.And this method is only applicable to the situation that road surface dries, if but being difficult to implement under dampness；Furthermore, Britain the SCRIM test carriage of the test pavement skid resistance condition designed, its prominent shortcoming is that volume is big, water consumption is big.The tractor that it adopts be self-contained within test carriage together with integrated system, whole system will be made to use once tractor breaks down, and test error is bigger under sleet state, it is impossible to strictly according to the facts reflection wet road surface state under antiskid performance.Sum it up, how when wet road surface, carry out the test of antiskid performance and the assessment test device ununified, effective of its attenuation degree and method of testing.Therefore, set up the appraisal procedure of antiskid performance degradation under test asphalt dampness and just seem very necessary.
Summary of the invention
The device and method that the technical problem to be solved is to provide under quantitative assessment dampness asphalt antiskid performance, provides foundation for improving bituminous paving rainy day security performance.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
The test device of asphalt antiskid performance under dampness, it is characterized in that: include adjustable first base of the gradient, described first base upper surface is provided with test specimen placing trough, described first base upper surface within described test specimen placing trough is fixedly installed pendulum value tester, it is placed with bitumen mixture specimen between the fixing foot of the two of described pendulum value tester, the described yaw lower surface of pendulum value tester contacts with the upper surface of described bitumen mixture specimen, one end of described bitumen mixture specimen is provided above the catch basin for simulated precipitation, described catch basin is arranged in described test specimen placing trough, the sidewall of described test specimen placing trough is additionally provided with rhone, the upper surface flush of the lower surface of described rhone and described bitumen mixture specimen；Described first base upper surface is further opened with the first row water hole being connected with described test specimen placing trough.
Described test specimen placing trough is bottomless without top, the equal opening in two ends.Described yaw height adjustable.
Described first base includes lower shoe arranged in parallel and upper plate, and between described lower shoe and upper plate, one end is connected by cutting with scissors, and the other end is connected by arrangement for adjusting height.
The frame of described test specimen placing trough and described upper plate are tightly connected and are formed casing with the end.
Described arrangement for adjusting height includes vertically disposed and for connecting the bolt of described lower shoe and upper plate.
By dividing plate, described catch basin is divided into aqua storage tank and drain tank inside described catch basin, the base plate of described aqua storage tank is provided with some through holes, the differing heights place of described dividing plate is provided with some spilled water holes, described spilled water hole place is provided with screw, and the sidewall bottom of described drain tank is provided with second row water hole.
Described spilled water hole is provided with at least 5 groups, often group at least two hole.
Described spilled water hole is provided with 5 groups, often organizes described spilled water hole from described catch basin base plate distance respectively 9cm, 14cm, 19cm, 24cm and 29cm, corresponding rainfall intensity respectively 12.5ml/s m2、15.7ml/s·m2、21.2ml/s·m2、24.7ml/s·m2With 27.1ml/s m2。
Described pendulum value tester includes T-shaped support, the middle radial type of described T-shaped support is provided with swing arm, described swing arm bottom is provided with described yaw, described T-shaped support is additionally provided with dial plate, described dial plate is provided with pointer, described yaw lower surface is provided with flexure strip, the bottom of described T-shaped support is provided with the second base of gate, the two of the doorframe shape of the second base both sides fixed after wearing described upper plate, by nut fixed after both passing through pendulum value tester fixed screw on the described fixing foot of the upper and lower of described upper plate.
Described flexure strip includes sheet rubber.
Described fixing foot is inverted U.
The method of testing of asphalt antiskid performance under dampness, it is characterised in that: comprise the following steps:
S01, is placed in upper plate surface by bitumen mixture specimen, makes bitumen mixture specimen surface be in drying regime；The initial gradient of the first base is zero, records bitumen mixture specimen without the pendulum value under gradient drying regime, is designated as NB0；
S02, regulates the bolt on the first base, makes the first base have certain slope；Keep the drying regime on bitumen mixture specimen surface；Record bitumen mixture specimen pendulum value under this gradient drying regime, be designated as NB1；Calculate bitumen mixture specimen antiskid performance offset B=NB0-NB1；
S03, keeps the gradient in S02 constant；Select the height of spilled water hole in catch basin, the screw at this spilled water hole place of outwarding winding, water filling in catch basin, reach to stablize head after the spilled water hole height selected until head；Repeat to record bitumen mixture specimen pendulum value under dampness 5 times, take its meansigma methods and be designated as HB；Calculate bitumen mixture specimen dough softening β=[NB of antiskid performance under this humidity degree0-(HB+B)]/NB0× 100%；If the dough softening is more little, illustrate that the antiskid performance of this bitumen mixture specimen is affected more little by surface water, otherwise, then affect more big, antiskid performance degradation is also more obvious.
The test device and method of asphalt antiskid performance under dampness provided by the invention, compared with prior art, it provides the benefit that: the setting of the spilled water hole of differing heights, can regulate head height simulated rainfall intensity；The setting of arrangement for adjusting height, can regulate the height of upper plate by swivel bolt and carry out simulated roadway horizontal wall inscription；This device records bitumen mixture specimen three feature pendulum value (i.e. B, HB, NB under different gradient and moist degree with pendulum value tester0), calculating the dough softening β (%) of bitumen mixture specimen antiskid performance, quantitative assessment asphalt is skid resistance loss of energy under dampness.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of catch basin in the present invention；
Fig. 3 is the structural representation of pendulum value tester in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in FIG. 1 to 3, the test device of asphalt antiskid performance under dampness, including the first base, catch basin 2 and pendulum value tester 4, described first base is divided into upper plate 11 and lower shoe 10, and the first base position is provided with arrangement for adjusting height 1.Described arrangement for adjusting height 1 includes bolt, and shank of bolt is through upper plate 11, and the bottom of shank of bolt is arranged at the upper surface of lower shoe 10, by the distance between swivel bolt scalable two-layer, changes the gradient of upper plate 11.The base plate of described catch basin 2 arranges some through holes 12, and the side of catch basin 2 is provided with 5 groups of spilled water holes 15, often two holes of group, to control head height.Often group spilled water hole 15 is from base plate distance respectively 9cm, 14cm, 19cm, 24cm and 29cm, the rainfall intensity respectively 12.5ml/s m that the height of 5 groups of spilled water holes 15 is corresponding from low to high2、15.7ml/s·m2、21.2ml/s·m2、24.7ml/s·m2With 27.1ml/s m2.Described pendulum value tester 4 is positioned over the middle part of bitumen mixture specimen 6；Bottom described pendulum value tester 4, two ends are connected with upper plate 11 by pendulum value tester fixed screw 18；The yaw 20 of described pendulum value tester 4 is swingable in perpendicular.
The method of testing of asphalt antiskid performance under dampness, comprises the following steps:
S01: bitumen mixture specimen 6 is placed in device upper plate 11 surface, makes the surface of bitumen mixture specimen 6 be in drying regime；Leveling pendulum value tester 4, when the sheet rubber on yaw 20 slide block contacts bitumen mixture specimen 6 surface just, fixing yaw 20；Press the release-push of bottom value tester 4, make yaw 20 slip on bitumen mixture specimen 6 surface；Record bitumen mixture specimen 6 without the pendulum value under gradient drying regime, be designated as NB0；
S02: rotate the bolt on the left of this device the first base upper plate 11, regulates the gradient of upper plate 11；Upper plate 11 is highly set to α, and upper plate 11 length is b, and the gradient is i, and the required height α regulated of upper plate 11 calculates by formula (1).
α=b × i (1)
Keep the drying regime of bitumen mixture specimen 6, record the bitumen mixture specimen 6 pendulum value under this gradient drying regime, be designated as NB1；Calculate the offset B=NB of bitumen mixture specimen 6 antiskid performance0-NB1；
S03: the gradient of holding means is constant；Select the height of spilled water hole 15, water filling in catch basin 2 in catch basin 2, reach to stablize after spilled water hole 15 height head, leveling pendulum value tester 4 until head；Repeat to record the bitumen mixture specimen 6 pendulum value under this dampness 5 times, take its meansigma methods and be designated as HB；Calculate bitumen mixture specimen 6 dough softening β=[NB of antiskid performance under this humidity degree0-(HB+B)]/NB0× 100%；
Choosing Nanjing Main road of west city is example.OGFC-13 asphalt is the evaluation methodology of antiskid performance under dampness, comprises the steps:
Choosing as shown in table 1 the gathering materials of grating, Colophonium selects SBS modified pitch.Drafting bitumen aggregate ratio is 4.9%, and voidage is 18.2%.Mold the rut plate being of a size of 300mm × 300mm × 50mm.
Table 1OGFC-13 grating
| Sieve aperture (mm) | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent of pass (%) | 98.0 | 72.9 | 24.4 | 16.9 | 13.5 | 10.7 | 8.3 | 6.8 | 5.0 |
Nanjing Rain Intensity Formula Based is:
In formula (2): q is rainfall intensity (ml/s hm2)；T is rainfall duration (min)；P is return period (year).Main road of west city place, Nanjing, repetition period of rainfall presses 2 years one chances, P=2；The time of the duration of rainfall presses 1 hour value: t=60min.It is q=137400ml/s hm by the flow of formula (2) unit of account area2, namely rainfall intensity is 13.74ml/s m2.Thus choose in catch basin 2 spilled water hole of 14cm bottom distance, the rainfall intensity of its correspondence is 15.7ml/s m2.Main road of west city is located in smooth, and it is 1.4% that road surface horizontal wall inscription is drafted.
Bitumen mixture specimen 6 is placed in device upper plate 11, makes bitumen mixture specimen 6 surface be in drying regime.Regulating the bolt of upper plate 11, making height α is zero, and namely the initial gradient of device is zero.Leveling pendulum value tester 4, when the sheet rubber on yaw 20 slide block contacts bitumen mixture specimen 6 surface just, fixing yaw 20.Press the release-push of bottom value tester 4, make yaw 20 slip on bitumen mixture specimen 6 surface.Record bitumen mixture specimen 6 the pendulum value under drying regime, NB when without the gradient0=65.Regulating the bolt height α=400 × 1.4%=5.6mm of device the first base upper plate 11, making the device gradient is 1.4%, records bitumen mixture specimen 6 the pendulum value under drying regime, NB when the gradient is 1.4%1=60.Calculate bitumen mixture specimen 6 offset B=NB of antiskid performance when 1.4% gradient0-NB1=5.
Water filling in catch basin 2, treats that head reaches 14cm, namely stablizes head after second group of spilled water hole 15 height.Leveling pendulum value tester 4, repeats to record the bitumen mixture specimen 6 pendulum value under the dampness of 14cm head height 5 times, takes its meansigma methods HB=40；Calculate bitumen mixture specimen 6 dough softening β of antiskid performance=[65-(40+5)]/65 × 100%=30.8% under the moist degree of 14cm head height.It follows that be 15.7ml/s m at rainfall2Under the dampness of left and right, the dough softening of OGFC-13 asphalt antiskid performance is relatively big, reaches 30.8%.Now not easily adhering between road surface and tire, vehicle brake braking distance can extend about 5m, when being equivalent to normal pavement skid resistance, with the speeds of 20km/h faster than former speed.
The above is only the preferred embodiment of the present invention; it is noted that, for those skilled in the art; under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
- null1. the test device of asphalt antiskid performance under dampness，It is characterized in that: include adjustable first base of the gradient，Described first base upper surface is provided with test specimen placing trough (5)，Described first base upper surface that described test specimen placing trough (5) is internal is fixedly installed pendulum value tester (4)，It is placed with bitumen mixture specimen (6) between the fixing foot of the two of described pendulum value tester (4)，Yaw (20) lower surface of described pendulum value tester (4) contacts with the upper surface of described bitumen mixture specimen (6)，One end of described bitumen mixture specimen (6) is provided above the catch basin (2) for simulated precipitation，Described catch basin (2) is arranged in described test specimen placing trough (5)，The sidewall of described test specimen placing trough (5) is additionally provided with rhone (7)，The upper surface flush of the lower surface of described rhone (7) and described bitumen mixture specimen (6)；Described first base upper surface is further opened with the first row water hole (8) being connected with described test specimen placing trough (5).
- 2. the test device of asphalt antiskid performance under dampness according to claim 1, it is characterized in that: described first base includes lower shoe (10) arranged in parallel and upper plate (11), between described lower shoe (10) and upper plate (11), one end is connected by cutting with scissors (9), and the other end is connected by arrangement for adjusting height (1).
- 3. the test device of asphalt antiskid performance under dampness according to claim 2, it is characterised in that: described arrangement for adjusting height (1) includes vertically disposed and for connecting described lower shoe (10) and the bolt of upper plate (11).
- 4. the test device of asphalt antiskid performance under dampness according to claim 1, it is characterized in that: described catch basin (2) is internal is divided into aqua storage tank (13) and drain tank by dividing plate by described catch basin (2), the base plate of described aqua storage tank (13) is provided with some through holes (12), the differing heights place of described dividing plate is provided with some spilled water holes (15), described spilled water hole (15) place is provided with screw (14), and the sidewall bottom of described drain tank is provided with second row water hole (16).
- 5. the test device of asphalt antiskid performance under dampness according to claim 4, it is characterised in that: described spilled water hole (15) is provided with at least 5 groups, often group at least two hole.
- 6. the test device of asphalt antiskid performance under dampness according to claim 5, it is characterized in that: described spilled water hole (15) is provided with 5 groups, often organize described spilled water hole (15) from described catch basin (2) base plate distance respectively 9cm, 14cm, 19cm, 24cm and 29cm, corresponding rainfall intensity respectively 12.5ml/s m2、15.7ml/s·m2、21.2ml/s·m2、24.7ml/s·m2With 27.1ml/s m2。
- 7. the test device of asphalt antiskid performance under dampness according to claim 2, it is characterized in that: described pendulum value tester (4) includes T-shaped support, the middle radial type of described T-shaped support is provided with swing arm, described swing arm bottom is provided with described yaw (20), described T-shaped support is additionally provided with dial plate (21), described dial plate (21) is provided with pointer (22), described yaw (20) lower surface is provided with flexure strip (23), the bottom of described T-shaped support is provided with second base (17) of gate, the two of the doorframe shape of the second base (17) both sides fixed after wearing described upper plate (11), fixed by nut (19) after the described fixing foot of the upper and lower of described upper plate (11) both passes through pendulum value tester fixed screw (18).
- 8. the test device of asphalt antiskid performance under dampness according to claim 7, it is characterised in that: described flexure strip (23) includes sheet rubber.
- 9. the test device of asphalt antiskid performance under dampness according to claim 7, it is characterised in that: described fixing foot is inverted U.
- 10. the method for testing of asphalt antiskid performance under the dampness according to any one of claim 1～9, it is characterised in that: comprise the following steps:S01, is placed in upper plate (11) surface by bitumen mixture specimen (6), makes bitumen mixture specimen (6) surface be in drying regime；The initial gradient of the first base is zero, records bitumen mixture specimen (6) without the pendulum value under gradient drying regime, is designated as NB0；S02, regulates the bolt on the first base, makes the first base have certain slope；Keep the drying regime on bitumen mixture specimen (6) surface；Record the bitumen mixture specimen (6) pendulum value under this gradient drying regime, be designated as NB1；Calculate bitumen mixture specimen antiskid performance offset B=NB0-NB1；S03, keeps the gradient in S02 constant；Select the height of spilled water hole (15) in catch basin (2), outward winding the screw (14) at this spilled water hole (15) place, water filling in catch basin (2), reaches to stablize head after spilled water hole (15) height selected until head；Repeat to record the bitumen mixture specimen (6) pendulum value under dampness 5 times, take its meansigma methods and be designated as HB；Calculate bitumen mixture specimen (6) the dough softening β=[NB of antiskid performance under this humidity degree0-(HB+B)]/NB0× 100%；If the dough softening is more little, illustrate that the antiskid performance of this bitumen mixture specimen (6) is affected more little by surface water, otherwise, then affect more big, antiskid performance degradation is also more obvious.
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| CN201610158972.2A CN105806776A (en) | 2016-03-18 | 2016-03-18 | Device and method for testing skid resistance of asphalt mixture in damp state |
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| CN110231267A (en) * | 2019-03-28 | 2019-09-13 | 广州珠江黄埔大桥建设有限公司 | A kind of device and method of indoor test drainage type asphalt drainage performance |
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Cited By (8)
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| CN106092875A (en) * | 2016-08-01 | 2016-11-09 | 山西省交通科学研究院 | The rotary friction coefficient tester of bituminous paving of simulated rainfall and method of testing thereof |
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| CN110231267A (en) * | 2019-03-28 | 2019-09-13 | 广州珠江黄埔大桥建设有限公司 | A kind of device and method of indoor test drainage type asphalt drainage performance |
| CN117269042A (en) * | 2023-10-07 | 2023-12-22 | 汇通路桥集团试验检测有限公司 | Pavement material friction performance testing device and method |
| CN117269042B (en) * | 2023-10-07 | 2024-04-30 | 汇通路桥集团试验检测有限公司 | Pavement material friction performance testing device and method |
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Application publication date: 20160727 |