CN107677799A - The frost heave method and its frost heaving resistant method of evaluating performance of compound after porous asphalt mixture pore plugging method, apparatus, blocking - Google Patents
The frost heave method and its frost heaving resistant method of evaluating performance of compound after porous asphalt mixture pore plugging method, apparatus, blocking Download PDFInfo
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- CN107677799A CN107677799A CN201710717023.8A CN201710717023A CN107677799A CN 107677799 A CN107677799 A CN 107677799A CN 201710717023 A CN201710717023 A CN 201710717023A CN 107677799 A CN107677799 A CN 107677799A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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Abstract
The invention discloses the frost heave method and its frost heaving resistant method of evaluating performance of compound after porous asphalt mixture pore plugging method, apparatus, blocking.Bottom and base are screwed at left and right sides of the drum ladle containing porous asphalt mixture test specimen, by repeatedly injecting the suspension and repeated drying of clay and clear water in top cover and base, realizes gradual blocking of the clay particle to asphalt hole.Compound is blocked up using sponge wrapping hole, and freezed after abundant water suction, realizes the frost heave of the stifled rear compound in hole.Tested with reference to Superpave mix-design, with porous asphalt mixture before and after frost heave disperse loss rate of change evaluation hole it is stifled after frost heaving resistant performance.
Description
Technical field
The present invention relates to porous asphalt mixture, belongs to porous asphalt pavement durability evaluation field.
Background technology
In order to improve urban ecological system function and reduce Urban Flood Waterlogging generation, China since 2012 energetically
" sponge city " construction is advocated, has put into effect a series of planning, encouragement policy and implement directions opinion.Built as " sponge city "
Importance, there is " ooze, be stagnant, store, be net, with, row " function porous asphalt pavement to have obtained extensive concern, it is considered to be shadow
Ring the key that " sponge city " builds success or failure.In porous asphalt pavement, porous asphalt mixture of the making on top layer passes through it
The abundant interconnected pore in inside plays infiltration, the important function of outside draining downwards.The durability of porous asphalt mixture is determined
The porous asphalt pavement even continuation of " sponge city " function are determined.
At present, the durable Journal of Sex Research of porous asphalt mixture mainly concentrates following several respects.First, porous asphalt mixture
Hole is easily blocked by the rubber grain etc. of dust, auto tire wear, causes porous asphalt mixture infiltration and drainage performance
Decline, resist or delay pore plugging to turn into one of durability research contents；Second, porous asphalt mixture is tied for skeleton space
Configuration formula, the pattern of bonding is contacted with point using point between coarse aggregate and coarse aggregate, cause compound easy under Vehicle Load
Appearance is dispersed, aggregate particle " running material ", and anti-disperse is the two of its durability research contents.Above-mentioned two except paying close attention to durability
Outside aspect, the frost heave of porous asphalt mixture does not cause enough attention for a long time, and this is due to that porous asphalt mixes
The interconnected pore closed inside material is a lot, after asphalt internal water congeals into ice, although volumetric expansion 9%, rich
Rich interconnected pore can be very good to dissipate because ice volumetric expansion causes pore pressure, therefore be generally acknowledged that porous asphalt mixing
Water-setting, which build-ups ice, in material hole to produce frost heaving failure to compound.
But research in recent years is found：The frost heave thought above is not built upon inside porous asphalt mixture significantly
On the premise of hole keeps connection, if compound hole is caused hole densification and blocked up by the blocking such as dust or high-temperature permanent deformation
Plug, volumetric expansion amount then nowhere dissipates after now compound internal water congeals into ice, and will inevitably result in pore pressure, may
Trigger frost heaving failure.Moreover, for the solid particle such as dust of plug-hole after freezing, its volumetric expansion amount can exceed that water knot
The dust of 9% volumetric expansion caused by ice, i.e. plug-hole causes the frost heave more serious than water freezing.Regrettably, in China
In the porous asphalt pavement of the porous pavements built up especially urban road, pore plugging problem is very universal and serious,
Because of the more dust in the periphery building site reason such as again, hole is just completely plugged soon after being open to the traffic, and is compared on part road surface
Hole dust is taken out of in high-grade highway air pump effect caused by tire fast scroll of getting on the car, the speed of urban road is slower,
The possibility for taking dust out of by tire is smaller.It can be seen that the hole of China city porous asphalt pavement is blocked up and its caused frost heave is asked
Topic is very prominent.But in porous asphalt mixture performance evaluation field, test that is current and not setting up the stifled rear frost heave performance in hole
Method, be thus necessary to invent it is a kind of evaluate porous asphalt mixture internally after pore plugging frost heave performance method.
The content of the invention
The present invention provide porous asphalt mixture internally after pore plugging frost heaving resistant performance method of testing, invention includes
Three parts：The frost heave scheme and frost heaving resistant of compound after the lab simulation of porous asphalt mixture pore plugging, pore plugging
The testing scheme of performance.
A kind of porous asphalt mixture pore plugging method, is comprised the steps of：
Step S1, the marshal piece for being molded porous compound is molded in a horizontal positioned drum ladle, tubular
The both ends open of container, and screw base and top cover respectively on two openends, outer wall of base and top cover etc. point is fixed
Opening is respectively equipped with multiple supporting legs, base and top cover；
Step S2, drying clay particle and clear water of the particle diameter in 0.15mm~0.3mm are mixed into suspension, will prepared
Suspension be divided into etc. two parts of quality, be injected into respectively from two openings of base and top cover in drum ladle, injection finishes
Afterwards, two openings on base and top cover are sealed by solid cock body, external force rocks the drum ladle so that drum ladle
Clay particle is well into the hole of porous compound marshal piece in interior suspension；
Step S3, solid cock body is changed into ventilative cock body, and the side that air-vent is provided with ventilative cock body is put upward
Be placed in baking oven, the moisture content in drying process in suspension by air-vent out of drum ladle it is evaporated, until tubular hold
Liquid in device is dried completely；
Step S4, after top cover and base being backed out and cleaned from drum ladle, ressembled closely with drum ladle, weight
Multiple step S2~step S3 obtains the porous compound test specimen that hole is blocked by clay after totally 3 times.
Before 3 repeat step S2~step S3, successively by drum ladle around own axes direction overturn 180 degree, 90 degree
And 180 degree so that marshal piece carries out 3 upsets, the blocking process of 4 drying and processings.
A kind of device based on the porous asphalt mixture pore plugging method, including a drum ladle, the tubular
The drum ladle of container including upper/lower terminal opening and it is threadedly coupled respectively with two openends of the drum ladle
A perforate is respectively provided with top cover and base, top cover and base；
Cock body, in mating connection with the perforate；
The consistent supporting leg of some root long degree, is respectively arranged on the outer wall of top cover and base, and along top cover outer wall and
Base outer wall is uniform.
The solid cock body and ventilative cock body are that silica gel material makes.
The solid cock body or ventilative cock body are round table-like.
A kind of frost heave method of compound after porous asphalt mixture pore plugging, blocked up hole is obtained after the demoulding by clay
Plug porous compound test specimen surrounding water-absorbing material it is fully wrapped around, tighten after, be completely submerged in clear water, make water imbibition material
Material and compound test specimen therein fully absorb water, and then take out and are immediately placed in -18 DEG C of refrigerators, complete the frost heave to compound
Process.
The water-absorbing material is the sponge that thickness is more than 15mm.
The frost heaving resistant method of evaluating performance of compound after a kind of hole is stifled, with the loss rate of change K that dispersesd=(S1-S0)/S0×
Frost heaving resistant performance after the 100% porous compound pore plugging of evaluation, wherein, S1The Superpave mix-design of compound after frost heave is blocked up for hole
Loss, S0To be dispersed loss without the compound of pore plugging and process of frost heave.
The beneficial effect that the present invention is reached：
The present invention realizes the lab simulation to porous asphalt mixture pore plugging, the stifled rear frost heave in hole, and passes through this
The common Superpave mix-design experiment of specialty, with the loss rate of change evaluation frost heaving resistant performance of dispersing of porous compound after frost heave.
The hole plugging simulation apparatus of the present invention has advantage easy to make, that operation is succinct.
Brief description of the drawings
Fig. 1 is the structural representation of porous asphalt mixture pore plugging device；
Fig. 2 is the front view of ventilative cock body；
Fig. 3 is Fig. 2 top view；
Fig. 4 is horizontal positioned pore plugging apparatus structure schematic diagram；
Fig. 5 is Fig. 4 side view；
Fig. 6 is four semicircular marks being made in its side wall of upset drum ladle three times；
Fig. 7 is that compound test specimen is blocked up in the hole of sponge wrapping.
1- top covers；2- drum ladles；3- bases；4- top covers；5- screw threads；The solid cock bodys of 6-；7- breathes freely cock body；8- is supported
Leg；9- porous asphalt mixtures；10- blocks the semicircular mark of process for the first time；Second of semicircle mark for blocking process of 11-
Note；12- third times block the semicircular mark of process；The semicircular mark of the 4th blocking process of 13-；14- clay particles；
15- sponges；16- suspensions.
Embodiment
Frost heaving resistant performance test methods after the porous asphalt mixture pore plugging of this invention are made below in conjunction with the accompanying drawings
Further describe.
Frost heaving resistant performance test methods are related to following link, the first mix hole after porous asphalt mixture hole is stifled
Gap blocks, the compound frost heave after the second blocking, the performance evaluation after the 3rd frost heave.The blocking of its mesopore uses institute of the present invention
The porous mix hole block apparatus stated is realized that compound frost heave is realized using cryogenic freezing, frost heaving resistant performance evaluation
Test and complete with reference to the common Superpave mix-design of this specialty.Below one by one to being illustrated and being described with upper type.
(1) porous mix hole block apparatus
Porous asphalt mixture internal void very abundant, there are interconnected pore, open pores, hole etc. of remaining silent, largely
There are some researches show the dust particle key particle diameter for blocking these holes is 0.15~0.3mm, and dries dust particle and be difficult to
Hole is blocked inside into porous compound, compound internal void is typically blocked by the induced effect of current, because
The suspension of this present invention configuration 0.15~0.3mm clay particle and clear water, is used for pore plugging.
On the other hand, in terms of the process of asphalt pore plugging, it is that hole is repeatedly gradually blocked by dust that hole is stifled
Process, not being not that can block hole the mixing suspension of clay and clear water once injects compound.
Therefore, the invention provides the hole block apparatus shown in Fig. 1, it is made up of top cover 1, drum ladle 2 and base 3, top
Lid 1 be a height be 80mm, a diameter of 130mm top cover 4, open up inside top cover 1 height be 65mm, internal diameter be 111.6mm's
Round mouth, round mouth inwall are provided with the screw thread 5 that height is 20mm, the open top of top cover 1, are open at the top of top cover 1 from the bottom to top
A diameter of 90mm, a diameter of 80mm on the inside round mouth top of top cover 1, with opening it is supporting have two round table-like silica gel plugs, be used for
Occlusion of openings, one is solid cock body 6, and another is ventilative cock body 7.
As shown in Fig. 2 the equally divided position of outer wall 4 in top cover 1 welds 4 size identical supporting legs 8, the length of supporting leg 8
More than 10mm, during ensureing that the level of top cover 1 is laterally located, supporting leg 8 can support top cover 1.
The height of drum ladle 2 is 70mm, and inside and outside footpath is respectively 101.6mm and 111.6mm, and drum ladle outer wall is away from top
20mm and away from screw thread is provided with the range of the 20mm of bottom, to screw and be connected with top cover 1 and base 3 respectively.
Base 3 constructs with top cover 1 with identical, and is fitted also with solid silica gel/6 and through hole silica gel plug 7.
(2) pore plugging method
The hole block apparatus formed using top cover 1, drum ladle 2 and base 3, can realize and porous compound hole is blocked up
Plug, is comprised the concrete steps that：
Step 1：The marshal piece of shaping asphalt in drum ladle 2, top cover 1, drum ladle 2 and bottom
Seat 3 is screwed successively by screw thread, and horizontal positioned；Prepare 0.15~0.3mm and dry the mixed of clay particle 300g and clear water 400g
Suspension is closed, is divided into the equal portions of identical two, is injected separately into the top cover 1 and base 3 at drum ladle both ends, cover tightly solid cock body 6,
Now the latter half of asphalt is soaked by suspension；Hole block apparatus is rocked in left and right back and forth, to make in the suspension of injection
Clay particle rocks number as 100 times well into the hole of porous asphalt mixture, the present invention is set, and rocks process as 60
~100s, solid rubber plug 6 is changed into ventilative cock body 7 again after rocking, and make throughhole portions upward, as shown in Figure 3；
The semicircular mark 10 for making to block process for the first time on the outside of drum ladle with marking pen is identified not by suspension
The top half of immersion, as shown in Figure 4；Hole block apparatus that top cover 1, drum ladle 2 and base 3 are formed and therein porous mixed
Close and expect that horizontal side is put into 150 DEG C of baking ovens together for test specimen and suspension, moisture passes through cock body 7 of breathing freely in suspension in drying process
In hole it is evaporated, taken out after 4h, complete for the first time block process.
Step 2：Outward winding top cover 1 and base 3, after cleaning up, then with the fitting tight of drum ladle 2.Upset 180 degree is twisted
Tight top cover 1, drum ladle 2 and base 3, it is downward to block the semicircular mark 10 of process for the first time done in step 1,
And second of semicircular mark 11 for blocking process is drawn in the side wall of drum ladle 2 with marking pen, identify the portion of side wall upward
Point.Process is blocked for the second time using with step 1 identical method, completion.
Step 3：Outward winding top cover 1 and base 3, after cleaning up, then with the fitting tight of drum ladle 2.Turn over to turn 90 degrees and tighten
Top cover 1, drum ladle 2 and base 3, until Step 1: the semicircular mark 10 of process is blocked done in step 2 for the first time
With second of semicircular mark 11 for blocking process in the left and right sides, and third time is drawn in the side wall of drum ladle 2 with marking pen
The semicircular mark 12 of blocking process, identify the part of side wall upward.Using with step 1 identical method, complete to mixing
Expect that the third time of hole blocks.
Step 4：Outward winding top cover 1 and base 3, after cleaning up, then with the fitting tight of drum ladle 2.Upset 180 degree is twisted
Tight top cover 1, drum ladle 2 and base 3, it is downward to block the semicircular mark 12 of process for the third time done in step 3,
And the semicircular mark 13 of the 4th blocking process is drawn in the side wall of drum ladle 2 with marking pen, identify the portion of side wall upward
Point.Using with step 1 identical method, complete to the 4th time of compound hole blocking, and compound test specimen is stripped.
Thus, 3 upsets are passed through so that porous asphalt mixture have passed through four blocking processes, obtains hole and is sticked
The porous compound that soil 14 blocks.
(3) the frost heave method of asphalt is blocked up in hole
Actual porous asphalt pavement road surface is during frost, and extraneous moisture can enter compound hole so that in hole
Dust particle has endlessly moisture and moisture supply when freezing, and causes its volumetric expansion amount very big, so as to blocking metapore
Gap or hole of remaining silent cause very big pore pressure, cause frost heave to damage and destroy.In order to simulate this process, the present invention is in hole
In the porous compound that gap is blocked by clay 14, the sponge 15 with good water suction and full water function is wrapped, is compound frost heave
Extraneous steam is provided, in order that sponge has good water suction and full water function, the thickness of sponge to be advisable more than 15mm, and
The compound test specimen for being wrapped with sponge is completely submerged in 25 DEG C of clear water so that clay fully infiltrates and inhaled in sponge and compound
Water, take out after 2h.When not wringing out sponge, they are put into together immediately 5h in -18 DEG C of refrigerator, inhaled during this in sponge
The moisture of receipts can be moved in compound hole, clay particle is coagulated ice and occur being similar to the actual volumetric expansion amount in road surface.
(4) after frost heave porous compound dispersion test
The Superpave mix-design that the present invention is commonly used using this specialty is tested, and is dispersed loss with porous compound before and after frost heave
Rate of change blocks up compound frost heaving resistant evaluation index as hole.Compound test specimen after frost heave is taken out out of sponge, in room temperature
Under the conditions of dry 24h, it is m to weigh test specimen quality0, and Superpave mix-design experiment is carried out, weigh test specimen quality m after dispersing1, obtain
The loss S that disperses of compound after frost heave1=(m0-m1)/m0× 100%.
With porous asphalt mixture test specimen, under without pore plugging and frost heave, Superpave mix-design experiment is carried out, is obtained
Disperse loss S0.With the rate of change K for loss of being dispersed before and after frost heaved=(S1-S0)/S0× 100% porous compound hole of evaluation blocks up
Frost heaving resistant performance after plug.It should be noted that KdFrost heaving resistant performance after the bigger porous compound pore plugging of explanation is poorer, when
When anti-freezing property is very poor, KdPossibly even it is more than 100%.
Embodiment：
Illustrate the method for testing of porous asphalt mixture frost heave performance under pore plugging below by embodiment.In embodiment
Porous asphalt mixture to be evaluated is OGFC-13, and its grading, asphalt content BC, voidage VV are shown in Table 1.
The OGFC-13 that the embodiment of table 1 uses
1. preparation and the pore plugging of asphalt pore plugging device
Prepare the pore plugging device of the present invention being made up of top cover, drum ladle and base, and check top cover
It can be screwed between drum ladle, drum ladle and base.
By the high temperature mix OGFC-13 of table 1 loose asphalt compound, and horse is used in drum ladle of the present invention
Xie Er hits real method shaping OGFC-13 marshal piece, and after test specimen cooling, the both ends of drum ladle are respectively with pushing up lid and bottom
Seat is screwed, and after level is laterally located, semicircle mark is drawn in drum ladle upper side with marking pen.
Preparing to dry clay particle, screening obtains the soil particle 1200g that particle diameter is 0.15~0.3mm, is divided into 4 parts, point
Do not mixed with 400g clear water, prepare and obtain the suspension that 4 parts of quality are 700g.Wherein 1 part of suspension half Injection Level side
In the top cover put, in second half injection base, after filling in solid cock body, pore plugging device is rocked back and forth within 60~100s
100 times, make pore interior of the clay particle well into compound.Solid rubber plug is substituted with ventilative cock body, and keeps hole
Blocking device is horizontal, is placed in 150 DEG C of baking ovens and is taken out after 4h, cools down.
Outward winding top cover and base, after cleaning up, then with drum ladle fitting tight.Overturn the top cover tightened, tubular is held
Device and base so that the semicircle of each marking pen mark does not repeat.Above pore plugging operates in triplicate.In this way, realize
Four blockings to OGFC-13 holes.
2.OGFC-13 frost heaves are with dispersing
OGFC-13 marshal pieces are stripped, surface of test piece is wrapped using dry sponge completely, and are tied up with rubber band,
It is completely submerged in 25 DEG C of clear water, is taken out after 2h and be immediately placed in freezing 5h in -18 DEG C of refrigerators.Taken out out of refrigerator and be wrapped with sponge
Test specimen, put at ambient temperature, after ice-out in sponge, open sponge, take out OGFC-13 test specimens, and in room temperature condition
Under dry 24h, it is m to weigh test specimen quality0=1145.2g.Superpave mix-design experiment is carried out, weighs test specimen quality m after dispersing1=
834.6g, obtain the loss S that disperses of compound after frost heave1=(1145.2-834.6)/1145.2 × 100%=27.1%.
Using initial mass as 1023gOGFC-13 test specimens, under without pore plugging and frost heave, Superpave mix-design is carried out
Experiment, quality is 945.1g after dispersing, and obtains the loss S that disperses0=(1023-945.1)/1023 × 100%=7.6%.Calculate
Disperse the rate of change K of loss before and after frost heaved=(27.1-7.6)/7.6 × 100%=256.6%, it is seen that compound before and after frost heave
Disperse loss it is widely different, this indicates that process of frost heave of the OGFC-13 after pore plugging in the present embodiment, to pore structure
With the significant bulbs of pressure, cause the frost heave damage that compound is larger.
It should be pointed out that for those skilled in the art, before the technology of the present invention principle is not departed from
Put, some improvement and deformation can also be made, those modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
- A kind of 1. porous asphalt mixture pore plugging method, it is characterised in that comprise the steps of：Step S1, the marshal piece for being molded porous compound is molded in a horizontal positioned drum ladle, drum ladle Both ends open, and screw base and top cover respectively on two openends, outer wall of base and top cover etc. point fixation is multiple Opening is respectively equipped with supporting leg, base and top cover；Step S2, drying clay particle and clear water of the particle diameter in 0.15mm ~ 0.3mm are mixed into suspension, it is outstanding by what is prepared Turbid such as is divided at two parts of quality, is injected into respectively from two openings of base and top cover in drum ladle, after injection, leads to Cross cock body and two opening sealings on base and top cover, external force are rocked into the drum ladle so that in drum ladle in suspension Clay particle is well into the hole of porous compound marshal piece；Step S3, cock body is changed into ventilative cock body, and the side that air-vent is provided with ventilative cock body is positioned over baking oven upward It is interior, moisture content in drying process in suspension by air-vent out of drum ladle it is evaporated, until the liquid in drum ladle Body is dried completely；Step S4, after top cover and base being backed out and cleaned from drum ladle, ressembled closely with drum ladle, repeat to walk Rapid S2 ~ step S3 obtains the porous compound test specimen that hole is blocked by clay after totally 3 times.
- A kind of 2. device based on porous asphalt mixture pore plugging method described in claim 1, it is characterised in that：Including one Drum ladle, the drum ladle upper/lower terminal opening and is threadedly coupled with two openends of the drum ladle respectively Top cover and base, be respectively provided with a perforate on top cover and base；Cock body, in mating connection with the perforate；The consistent supporting leg of some root long degree, is respectively arranged on the outer wall of top cover and base, and along top cover outer wall and base Outer wall is uniform.
- 3. the device of porous asphalt mixture pore plugging method according to claim 1, it is characterised in that：It is described solid Cock body and ventilative cock body are silica gel material.
- 4. the device of porous asphalt mixture pore plugging method according to claim 1, it is characterised in that：It is described solid Cock body and ventilative cock body are round table-like.
- 5. a kind of frost heave method of compound after porous asphalt mixture pore plugging, it is characterised in that the demoulding after obtain hole Porous compound test specimen surrounding water-absorbing material that gap is blocked by clay is fully wrapped around, tighten after, be completely submerged in clear water, Water-absorbing material and compound test specimen therein is fully absorbed water, then take out and be immediately placed in -18 DEG C of refrigerators, complete to mixed Close the process of frost heave of material.
- 6. the frost heave method of compound after porous asphalt mixture pore plugging according to claim 5, it is characterised in that The water-absorbing material is the sponge that thickness is more than 15mm.
- The frost heaving resistant method of evaluating performance of compound after 7. a kind of hole is stifled, it is characterised in that with the loss rate of change K that dispersesd=(S1- S0)/S0Frost heaving resistant performance after × 100% porous compound pore plugging of evaluation, wherein, S1The willing tower of compound after frost heave is blocked up for hole Fort is dispersed loss, S0To be dispersed loss without the compound of pore plugging and process of frost heave.
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| CN111781335A (en) * | 2019-03-18 | 2020-10-16 | 山东高速集团有限公司 | Method for evaluating anti-flying performance of drainage asphalt mixture in different areas |
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