CN101259995A - Roadbed surface water-proof asphalt mixture - Google Patents
Roadbed surface water-proof asphalt mixture Download PDFInfo
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- CN101259995A CN101259995A CNA2008100445546A CN200810044554A CN101259995A CN 101259995 A CN101259995 A CN 101259995A CN A2008100445546 A CNA2008100445546 A CN A2008100445546A CN 200810044554 A CN200810044554 A CN 200810044554A CN 101259995 A CN101259995 A CN 101259995A
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Abstract
The invention discloses a formation level surface-layer waterproof bituminous mixture which is mainly used in the formation level surface layer of a non-ballast track railway and in the waterproof treatment of other ground surfaces not under load. The mixture adopts the following parameters: the permeability coefficient K is less than 10x10<-4>cm/s; the voidage VV ranges between 1 and 3 percent; the standard Marshall stability MS is more than 5kN; and the frost thawing-cleavage fracture ratio TSR is more than 60 percent. The formation level surface-layer waterproof bituminous mixture has the advantages that: the mixture, which has excellent waterproof performance and can prevent the infiltration of surface water, is used in the formation level of the non-ballast railway track of a railway line for passenger traffic, thereby protecting the subgrade bed soil of a subgrade from water corrosion; moreover, the fundamental effect of the mixture is to maintain the secular stability of the dynamic performance of a subgrade bed, thereby ensuring the comfortableness and the safety during high-speed driving.
Description
Technical field
The present invention relates to a kind of water-proof material, particularly a kind of roadbed surface water-proof asphalt mixture that is used for Line for Passenger Transportation non-fragment orbit railway bed.
Background technology
Line for Passenger Transportation non-fragment orbit railway has proposed strict requirement to the roadbed settlement after construction, for the subgrade engineering that is built in open-air atmosphere by rock-soil material, for guaranteeing the long-term stability of subgrade engineering kinematic behavior and bearer properties, must make up the anti-drainage system of perfect Line for Passenger Transportation non-fragment orbit railway bed engineering.The anti-drainage system of subgrade engineering comprises: roadbed filling is resisted water erosion; Road bed is prevented draining; Underdrainage, comprise embankment substrate underdrainage and and the cutting bedding change fill out the bottom underdrainage; Anti-draining of side slope and land drainage comprise embankment, the anti-draining of cut slope and lateral sulcus, gutter, waterways.The anti-draining of road bed is the important component part in the anti-drainage system of Line for Passenger Transportation roadbed.For preventing that showing water infiltrates the roadbed body, the road bed waterproof should adopt totally-enclosed waterproof measure.
High-speed railway is all attached great importance to the road bed WATER REPELLENT both at home and abroad, and high-speed railway subgrade face WATER REPELLENT scheme mainly contains following a few class at present:
1. strengthen surface layer of subgrade bed.As the rigid graded broken stone layer of Japanese water (being called " formation protection layer " in Germany), the perhaps asphalt concrete layer that 50～80mm is thick (generally reaching 200～250mm) with diffusion-induced stress.
2. adopt asphalt cemented ballast bed.Fill the few maintenance track structure formation of railway roadbed as the wide pillow pitch of Japan, German double-block type sleeper bituminous concrete railway roadbed non-fragment orbit, the whole sleeper bituminous concrete railway roadbed non-fragment orbit of groove type and the whole sleeper bituminous concrete of steel pole formula railway roadbed etc.
3. the high-speed railway subgrade top layer is provided with " bed course ".This scheme of the more employing of France's high ferro, bed course not only plays the waterproof damp proof insulation, but also can make subgrade soils stressed evenly by diffusion-induced stress.
4. the track foundation panel edges is to curb place asphalt concrete water-proof layer.First non-fragment orbit test section of China---the line ballastless track test section that changes then adopts this kind form.China's " Line for Passenger Transportation non-fragment orbit Railway Design guide " clearly stipulates: the water layer of should setting up defences of the road bed beyond concrete bearing layer or the concrete bed, adopt bituminous concrete or the C25 concrete of thick 5～10cm, therefore be the major programme that adopts during the present Line for Passenger Transportation of China is built at track foundation panel edges to curb place asphalt concrete water-proof layer, but do not form a cover technological standard and an appraisement system as yet, be difficult to guarantee construction quality.This scheme medium pitch concrete water-proof layer directly is not subjected to the train load effect, and this is that German, Japanese bituminous concrete reinforcement surface layer of subgrade bed is different.
In a word, what measure was comprehensively implemented for the road bed WATER REPELLENT both at home and abroad is to strengthen the road bed pumping equipment, forms the thought of the married combined drainage system of antiseepage draining.Therefore, road bed waterproof scheme is systems organization comprehensively, to reach the purpose that as early as possible surface water, infiltration water is entered the waterways.
Summary of the invention
Technical problem to be solved by this invention provides a kind of roadbed surface water-proof asphalt mixture that is used for the non-fragment orbit railway with favorable waterproof property.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: roadbed surface water-proof asphalt mixture of the present invention, its coefficient of permeability K＜10 * 10
-4Cm/s, voidage VV 1%～3%, standard Marshall stability MS＞5kN, the freeze thawing cleavage strength is than TSR＞60%.
The grating type of described roadbed surface water-proof asphalt mixture is SAMI-10.
Select 50 for use in the described roadbed surface water-proof asphalt mixture
#, 70
#Or 90
#Pitch.
The invention has the beneficial effects as follows; has favorable waterproof property; can play and prevent that table from oozing under water; be used for Line for Passenger Transportation non-fragment orbit railway subgrade surface; can protect subgrade bed soil not to be subjected to the erosion of water; its final effect is to keep subgrade bed dynamic performance long-term stability, the comfortableness of assurance high speed traveling and safe and reliable.
Roadbed surface water-proof asphalt mixture of the present invention can be used for other not WATER REPELLENT of the piece of smooth land of bearing load equally.
Description of drawings
This specification sheets comprises following eight width of cloth accompanying drawings:
Shown in Fig. 1 is the on-the-spot arrangement form synoptic diagram of non-fragment orbit railway subgrade surface SAMI layer;
Shown in Fig. 2 is the technical indicator system of SAMI compound of the present invention;
Shown in Fig. 3 is the proportioning deterministic process schema of SAMI compound of the present invention;
Shown in Fig. 4 is the coefficient of permeability K and the relation curve of using oil mass of SAMI-10S compound;
Shown in Fig. 5 is the voidage VV and the relation curve of using oil mass of SAMI-10S compound;
Shown in Fig. 6 is the standard Marshall stability MS and the relation curve of using oil mass of SAMI-10S compound;
Shown in Fig. 7 is the low temperature linear contractive quotiety C and the relation curve of using oil mass of SAMI-10S compound;
Shown in Fig. 8 is the relation curve of the freeze thawing cleavage strength of SAMI-10S compound than TSR and usefulness oil mass.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Be convenient narration, with roadbed surface water-proof asphalt mixture called after of the present invention " SAMI compound " (Surface Asphalt Mixture Impermeable), the waterproof layer that forms behind its making is called " SAMI layer " (SAMI Layer) in this manual.
With reference to Fig. 1, lay water proofing asphalt compound (SAMI compound) at track foundation panel edges to curb place and form the major programme that road bed waterproof top layer (SAMI layer) is employing during the present Line for Passenger Transportation of China is built.
With reference to Fig. 2, the present invention has set up a kind of technical indicator system that is mainly used in the water proofing asphalt compound on non-fragment orbit railway subgrade surface waterproof top layer by a large amount of research experiments.
1. coefficient of permeability K
Permeability performance is most important, the most crucial performance that asphalt is considered, as the index of estimating SAMI compound permeability performance, this index adopts the measuring method of highway engineering infiltration coefficient with coefficient of permeability K (cm/s) in the present invention, obtains through unit conversion.The coefficient of permeability K index is not only the design of SAMI compound, comprises that best asphalt content is determined, the design of indoor proportioning is checked and the important indicator of field compounding method, directly reflects the key index of SAMI layer control of construction quality especially.
2. voidage VV
High-temperature behavior has determined voidage VV should have lower limit.Because of there is not the vehicular load effect in the SAMI layer, the index of high temperature stability performance mainly is based on bellding and considers.The present invention adopts the measure of control voidage VV to control the high temperature stability performance of SAMI compound indirectly, standard Marshall stability MS also can be used as the r of SAMI compound simultaneously, so the high temperature index of voidage VV and standard Marshall stability MS formation SAMI compound of the present invention.Test shows that there are very strong dependency in coefficient of permeability K index and voidage VV index, so voidage VV and coefficient of permeability K constitute the waterproof index of SAMI compound of the present invention.
3. low temperature linear contractive quotiety C
The SAMI layer is exposed to physical environment, bear the illumination effect and the thermal stress of the changeable complexity of bringing of weather, this high temperature performance for material is a test, special in outside temperature lower (especially temperature decrease), the SAMI layer will produce temperature shrinkage stress, the allowable tensile stress that surpasses the SAMI compound when string stress just can produce transverse crack, and this cold cracking badly influences the anti-seepage effect of SAMI layer, has enough anti-low temperature abilities so must guarantee the SAMI compound.Among the present invention, at first set up the low temperature linear contractive quotiety C of all types of SAMI compounds and with the quantitative relationship between the oil mass, carry out qualitative reaction with low temperature bursting by freezing test then, the last quantitative target that proposes low temperature linear contractive quotiety C control SAMI compound low-temperature performance of the present invention indirectly.
4. standard Marshall stability MS
The SAMI layer is except that bearing the construction equipment load, also may produce tired response to train high speed travelling load, so should guarantee the supporting capacity that it is basic, the present invention adopts standard Marshall stability MS to carry out the evaluation of SAMI compound fundamental strength of the present invention, its canonical reference Class II highway requirement.
5. freeze thawing cleavage strength compares TSR
Good anti-water damage ability is another key property that the SAMI layer should possess, SAMI compound of the present invention adopts the freeze thawing cleavage strength than the index of TSR as this performance of evaluation, and freeze thawing cleavage strength combined standard Marshall stability constitutes the comprehensive strength index of SAMI compound of the present invention.
6. other indexs
SAMI layer minimum thickness considered from three aspects, the rut template size of laboratory shop experiment; The constructing operation feasibility; Actual waterproof needs.
Analysis-by-synthesis is defined as reaching 5cm with SAMI layer minimum thickness behind decking and rolling, the water surrounding areas with complicated should suitably thicken.In addition, the appearance characteristics behind the SAMI compound making has constituted corresponding pass and has learned index, requires outward appearance fine and close clean and tidy, and even thickness is emanated less.Minimum thickness and appearance characteristics etc. have constituted other indexs of SAMI compound.
The key technical indexes of SAMI compound of the present invention is as shown in table 1.
Table 1 water proofing asphalt compound technical indicator reference standard
Definite method of SAMI Mixture Ratio of the present invention:
One, starting material are selected
1. building stones
Because China is vast in territory, the distribution of various places material also has different characteristics separately, therefore the selection of asphalt mineral building stones should be decided according to specific circumstances, but no matter be machine-processed rubble or the rolling rubble of cobble, all should guarantee the grating that each grade material is good, and the intensity of material itself can occupy back burner, this be by SAMI compound itself the function decision that should possess, simultaneously owing to guaranteeing the anti-water damage ability that the SAMI compound is good, so need to guarantee that building stones and binder have certain adhesivity.Therefore, building stones are selected for use and should preferentially be selected alkaline building stones for use in conjunction with local conditions, to strengthen the anti-water damage ability of SAMI compound.
2. filler
Filler has a very important role for the influence of the voidage of SAMI compound, and voidage is the key index that directly determines SAMI compound design success or failure, thus should pay attention to filler during the design of SAMI compound especially select and guarantee certain Ratio of filler bitumen for use.Therefore, filler is generally selected the hydrophobic nature breeze for use, can consider to add measures such as antistripping agent, part slaked lime or cement to strengthen the compound water stability when pitch and mineral aggregate adhesivity deficiency.
3. pitch
Because the bituminous performance directly has influence on the performance of asphalt, consider the functional characteristics of SAMI compound of the present invention, to bituminous select to pay attention to especially its ageing-resistant performance and with the adhesion property of mineral aggregate, if consider, can consider that above-mentioned two aspects carry out modification to asphalt modification.In addition, bituminous need to be selected then should pay attention to the crack resistance at low-temperature of pitch itself more as Han Qu according to different weather subregions.According to testing data and in conjunction with the suggestion of bi tumenf orr oad technical stipulation, can select 70 for use in the most of area of China
#Pitch, 50
#And 90
#Pitch also can meet the demands, and for satisfying the requirement of the north and southern envrionment temperature, advises that southern hot area preferentially selects 50 for use
#Pitch, north cold area preferentially select 90 for use
#Pitch.
Two, grating type selecting
The present invention is by a large amount of research experiments, can determine that SAMI-10 is blanket asphalt mixture gradation type, but consider different temperature subregions, as Han Qu should more concern compounds low-temperature cracking-resistance, multiple high-temperature stability (mainly being the bellding problem) of looking compound is answered in the hot-zone, therefore, SAMI-5 (tar sand) and SAMI-13 also can adopt under certain environment.
Three, best asphalt content is determined
The present invention with this designing technique index system of setting up the anti-water mixture of hot asphalt, is applied to the SAMI compound of other types and grating by to SAMI-10 definite research of the best asphalt content of (SAMI-10S) compound on the upper side then.
The test index of three kinds of typical grading compounds of SAMI-10 is as shown in table 2 with the relation curve with oil mass.
Show 2SAMI-10 water proofing asphalt test mixture index and use the oil mass relation database table
The relation curve of main test index of SAMI-10S compound and asphalt content such as Fig. 4 are to shown in Figure 8.
Adopt following steps to determine the best asphalt content (is example with the SAMI-10S asphalt) of compound:
Step 1: determine the asphalt content scope by core index coefficient of permeability K and voidage VV.
Practical situation according to the water penetration test on-the-spot test, consider as sealing, device and artificial error factors, coefficient of permeability K is less than or equal to 10mL/min, and (permeability coefficient is 8.22 * 10-3cm/s, compound for convenient desirable 10 * 10-3cm/s) can be used as impervious material, and the asphalt content of maximum infiltration coefficient correspondence is designated as OAC1; Simultaneously, the research and the experience of existing highway asphalt show, the voidage of compound should not be less than 3%, otherwise be easy to generate bellding phenomenon and high temperature rut, but there is not traffic loading influence (removing the construction equipment load of temporarily bearing in the construction process) in the SAMI compound in the present invention, but the variation of envrionment temperature makes bituminous expand and contraction, and then needs compound to have a minimum aperture rate, considers that the minimum voidage of SAMI compound should not be lower than 1%.The asphalt content of minimum voidage VV correspondence is designated as OAC2, and three kinds of situations may appear in OAC2 contrast OAC1: 1. OAC1＜OAC2 is a generalized case; 2. OAC1=OAC2 then can be with the asphalt content of 0.5% voidage correspondence as OAC ' 2; 3. OAC1＞OAC2, promptly the asphalt of this grating is unsuitable as anti-water mixture.
By Fig. 4 and Fig. 5 asphalt of AC-10S as can be seen, its asphalt content scope belongs to and 1. plants situation, and OAC1=4.8%, OAC2=5.9%
Promptly determined that by core index infiltration coefficient and voidage the asphalt content scope OAC1～OAC2 of SAMI-10S compound in this test is 4.8%～5.9%.
Step 2: the best asphalt content OAC that determines the SAMI compound by common intensity index (standard Marshall stability MS) and weathering resistance index (low temperature linear contractive quotiety C, freeze thawing cleavage strength are than TSR).
In asphalt content scope OAC1～OAC2, mainly there are three kinds of situations in other indexs: 1. other index curvilinear transformation is not obvious in this scope; 2. other index curve monotone increasing or successively decrease in this scope; 3. other index curve has extreme value in this scope.
The Marshall stability of SAMI-10S shown in this test chart 6-in fixed asphalt content scope, have extreme value with the oil mass relation curve, the asphalt content 5.8% that is the 21kN correspondence is the best asphalt content of standard Marshall stability MS index correspondence, therefore desirable OAC3=5.8%.
According to SAMI-10S low temperature linear shrinkage test-results, Plotted line shrinkage coefficient-asphalt content relation curve (Fig. 7), can get the best asphalt content of the asphalt content of minimum low temperature linear contractive quotiety value correspondence in this scope, therefore desirable OAC4=4.8% for this index correspondence
Consider that highway engineering detects foundation greater than 80% as asphalt for road with splitting freeze thawing intensity,,, be about to it and judge the lower limit of best asphalt content as this index so this index is reduced to 70% because there is not vehicular load in the SAMI layer.Freeze thawing cleavage strength as this test SAMI-10S presents monotone increasing with oil mass relation curve (Fig. 8) than TSR-in this scope, and minimum limit value 70% promptly is positioned at this scope, therefore desirable OAC5=5.5%.
Step 3: the determining of best asphalt content.
Take all factors into consideration, get its average as best asphalt content OAC, that is:
So this test SAMI-10S is best, and asphalt content is:
OAC＝(4.8％+5.9％+5.8％+4.8％+4.9％)/5＝5.4％
The SAMI compound of other grating types all can carry out determining of best asphalt content by above-mentioned steps, need to prove if coefficient of permeability K does not satisfy the most basic requirement, then the compound of this grating type should not then need not to carry out determining of asphalt content as the water proofing asphalt compound.
Four, proportioning design check
According to the anti-corresponding test specimen of water mixture moulding of best asphalt content and the fixed grating type system of mixing again, carry out the test of five big indexs (coefficient of permeability K, voidage VV, standard-bred have a rest stability MS, low temperature linear contractive quotiety C and freeze thawing cleavage strength than TSR), if satisfy the listed technical indicator standard of table 1, then can determine proportioning.
Claims (5)
1. roadbed surface water-proof asphalt mixture is characterized in that: the coefficient of permeability K of this compound＜10 * 10
-4Cm/s, voidage VV 1%～3%, standard Marshall stability MS＞5kN, the freeze thawing cleavage strength is than TSR＞60%.
2. roadbed surface water-proof asphalt mixture as claimed in claim 1 is characterized in that: low temperature linear contractive quotiety C＜30 * 10 of this compound
-6/ ℃.
3. roadbed surface water-proof asphalt mixture as claimed in claim 1 or 2 is characterized in that: the minimum thickness that this mixture laying rolls the road bed waterproof top layer that forms, back is 5cm.
4. roadbed surface water-proof asphalt mixture as claimed in claim 1 is characterized in that: the grating type of this compound is SAMI-10, SAMI-5 or SAMI-13.
5. roadbed surface water-proof asphalt mixture as claimed in claim 1 is characterized in that: select 50 for use in this compound
#, 70
#Or 90
#Pitch.
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|---|---|---|---|
| CNA2008100445546A CN101259995A (en) | 2008-05-28 | 2008-05-28 | Roadbed surface water-proof asphalt mixture |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832994A (en) * | 2010-04-15 | 2010-09-15 | 同济大学 | Method for testing property of low-carbon asphalt and low-carbon asphalt mixtures |
| CN102788744A (en) * | 2012-07-27 | 2012-11-21 | 马鞍山十七冶工程科技有限责任公司 | Sealing material for detecting water permeability resistance of asphalt pavement |
| CN103255694A (en) * | 2013-06-06 | 2013-08-21 | 中铁二院工程集团有限责任公司 | Cutting bed structure of ballast-less rail type high-speed railway in seasonal frozen-earth area |
| CN104652179A (en) * | 2015-01-22 | 2015-05-27 | 中铁二院工程集团有限责任公司 | Surface layer-reinforced and waterproof heavy-axle load heavy-haul railway subgrade bed structure |
| CN109369048A (en) * | 2018-12-26 | 2019-02-22 | 山东大学 | A kind of asphalt and preparation method thereof of chemical modification red mud substitution miberal powder |
| CN110132817A (en) * | 2019-05-20 | 2019-08-16 | 哈尔滨工业大学 | A kind of multidirectional seepage tests method of the asphalt of constant head |
| CN111077058A (en) * | 2020-01-13 | 2020-04-28 | 东南大学 | Experimental method for determining using amount of waterproof material on pavement surface of steel bridge deck |
| CN111268943A (en) * | 2020-02-10 | 2020-06-12 | 北京铁科特种工程技术有限公司 | Asphalt graded broken stone for high-speed railway roadbed and preparation method thereof |
-
2008
- 2008-05-28 CN CNA2008100445546A patent/CN101259995A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832994A (en) * | 2010-04-15 | 2010-09-15 | 同济大学 | Method for testing property of low-carbon asphalt and low-carbon asphalt mixtures |
| CN101832994B (en) * | 2010-04-15 | 2013-04-17 | 同济大学 | Method for testing property of low-carbon asphalt and low-carbon asphalt mixtures |
| CN102788744A (en) * | 2012-07-27 | 2012-11-21 | 马鞍山十七冶工程科技有限责任公司 | Sealing material for detecting water permeability resistance of asphalt pavement |
| CN103255694A (en) * | 2013-06-06 | 2013-08-21 | 中铁二院工程集团有限责任公司 | Cutting bed structure of ballast-less rail type high-speed railway in seasonal frozen-earth area |
| CN103255694B (en) * | 2013-06-06 | 2015-09-30 | 中铁二院工程集团有限责任公司 | Frozen ground regions non-fragment orbit cutting bed of rapid transit railway structure |
| CN104652179A (en) * | 2015-01-22 | 2015-05-27 | 中铁二院工程集团有限责任公司 | Surface layer-reinforced and waterproof heavy-axle load heavy-haul railway subgrade bed structure |
| CN109369048A (en) * | 2018-12-26 | 2019-02-22 | 山东大学 | A kind of asphalt and preparation method thereof of chemical modification red mud substitution miberal powder |
| CN110132817A (en) * | 2019-05-20 | 2019-08-16 | 哈尔滨工业大学 | A kind of multidirectional seepage tests method of the asphalt of constant head |
| CN110132817B (en) * | 2019-05-20 | 2022-08-05 | 哈尔滨工业大学 | Constant-head multi-directional seepage test method for asphalt mixture |
| CN111077058A (en) * | 2020-01-13 | 2020-04-28 | 东南大学 | Experimental method for determining using amount of waterproof material on pavement surface of steel bridge deck |
| CN111077058B (en) * | 2020-01-13 | 2020-09-11 | 东南大学 | Experimental method for determining using amount of waterproof material on pavement surface of steel bridge deck |
| CN111268943A (en) * | 2020-02-10 | 2020-06-12 | 北京铁科特种工程技术有限公司 | Asphalt graded broken stone for high-speed railway roadbed and preparation method thereof |
| CN111268943B (en) * | 2020-02-10 | 2021-12-21 | 北京铁科特种工程技术有限公司 | Asphalt graded broken stone for high-speed railway roadbed and preparation method thereof |
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Open date: 20080910 |