CN107056185A - A kind of aggregate grading design method for improving Cement-emulsified asphalt mixture intensity - Google Patents
A kind of aggregate grading design method for improving Cement-emulsified asphalt mixture intensity Download PDFInfo
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- CN107056185A CN107056185A CN201710170134.1A CN201710170134A CN107056185A CN 107056185 A CN107056185 A CN 107056185A CN 201710170134 A CN201710170134 A CN 201710170134A CN 107056185 A CN107056185 A CN 107056185A
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The present invention relates to a kind of aggregate grading design method for improving Cement-emulsified asphalt mixture intensity.Involved method includes：Determine that multistage screen size, the corresponding level of screen size at different levels that target level is matched somebody with somebody match somebody with somebody lower limit with the upper limit and the corresponding level of screen size at different levels；Linear fit, obtains straight line one：LogPOn(x)=a Log (x/xmax)+b and straight line two：LogPUnder(x)=c Log (x/xmax)+d；It is slope respectively K1、K2、K3、K4、K5... and Kn+1N+1 bar straight lines；Each self-corresponding grading curve of n+1 bar straight lines is done, optimum gradation curve is therefrom determined.The method being related in the present invention avoids Utopian design in conventional method, is more nearly practical engineering application.
Description
Technical field
The invention belongs to road engineering material field, more particularly to a kind of collection for improving Cement-emulsified asphalt mixture intensity
Expect gradation design method.
Background technology
Cement-emulsified asphalt mixture is a kind of nonuniformity, multi-level (macroscopical, microcosmic, thin to see) and multiphase (solid phase, liquid
Phase, gas phase) composite, they are widely used in road surface, railway, oil well engineering and construction material.
Contain substantial amounts of moisture in cement-emulsified asphalt rubber cement, the growth influence on the intensity at compound initial stage is larger.And
It is one of important component of Cement-emulsified asphalt mixture to gather materials, and it is empty with upper volume that it occupies 3/4ths in compound
Between, skeleton function is act as, the performance impact to compound is notable.Mix type is divided according to the mode of action between gathering materials
For suspension-compact structure, skeleton-gap structure and skeleton-compact structure.But to the constraint bar of aggregate grading in current standard
Part is limited, it is difficult to control the slickness and continuity of grading curve, causes aggregate grading to meet Practical Project demand.
The content of the invention
For in terms of the raising of Cement-emulsified asphalt mixture early strength, it is an object of the invention to propose a kind of raising water
The aggregate grading and its design method of mud Emulsified Asphalt Mixture intensity.
The aggregate grading design method for the Cement-emulsified asphalt mixture intensity that the present invention is provided includes：
(1) determine that multistage screen size, the corresponding level of screen size at different levels that target level is matched somebody with somebody match somebody with somebody the upper limit and sieve aperture chi at different levels
Very little corresponding level matches somebody with somebody lower limit；
(2) multistage screen size, the corresponding level of screen size at different levels matched somebody with somebody to target level match somebody with somebody the upper limit and screen size at different levels
Corresponding level carries out linear fit with lower limit, obtains straight line one：LogPOn(x)=a Log (x/xmax)+b and straight line two：LogPUnder
(x)=c Log (x/xmax)+d, wherein：X is screen size, xmaxFor maximum screen size, POn(x) it is corresponding for screen size x
Level matches somebody with somebody the upper limit, PUnder(x) lower limit is matched somebody with somebody for the corresponding levels of screen size x, a, b, c and d are respectively the linear equation system after linear fit
Number；
(3) straight line one, straight line two, Y-axis and straight line x '=Log (xmin/xmax) composition quadrangle, wherein xminIt is minimum
Screen size；
(4) diagonal of the quadrangle is done, two cornerwise intersection points are S, and two cornerwise slopes are respectively K1
And K2, and K1<K2；By [K1,K2] etc. interal separation be n interval：[K1,K3]、[K3,K4]、[K4,K5]、……、[Kn,Kn+1]、
[Kn+1,K2], obtain K3、K4、……、Kn+1, n is more than or equal to 4；
(5) cross point S and be slope respectively K1、K2、K3、K4、K5... and Kn+1N+1 bar straight lines；
(6) each self-corresponding grading curve of n+1 bar straight lines is done, the compound horse that n+1 bar aggregate grading curves are done respectively has a rest
That stability test and cleavage strength experiment, obtain the Marshall stability and cleavage strength of the compound of every grading curve,
By K1、K2、K3、K4、K5、……、Kn+1It is fitted with corresponding n+1 Marshall stability value, horse is obtained according to fitting result
The corresponding K of Xie Er stability maximumsmax1；By K1、K2、K3、K4、K5、……、Kn+1Corresponding n+1 cleavage strength value is intended
Close, the corresponding K of cleavage strength maximum is obtained according to fitting resultmax2, cross S points and do slope for (Kmax1+Kmax2The straight line of)/2,
The straight line is gained aggregate grading curve.
In a kind of specific embodiment, n=5 of the invention.
The present invention compared with prior art, has the following technical effect that：
(1) method being related in the present invention avoids Utopian design in traditional theory, i.e., mineral aggregate gradation is closer to throwing
Thing line, mineral aggregate voidage is smaller；And the grain size that gathers materials of next stage gathers materials the space to be formed equal to upper level, is more nearly work
Cheng Yingyong.
(2) method being related in the present invention can arbitrarily match somebody with somebody to level and be adjusted without causing grading curve as requested
Not smooth enough, level is not good with performance；It is better than traditional theory method with each basic index of the compound of the design method.
(3) method that is related to is simple to operate in the present invention, control variable is few (level is with slope K and key point S).
Brief description of the drawings
Fig. 1 is gradation design model example of the invention；
Fig. 2 is the corresponding grading curve example of each slope of the invention；
Fig. 3 is worth corresponding Stabilily parameter result example for the Different Slope of the present invention；
Fig. 4 is worth corresponding cleavage strength test result example for the Different Slope of the present invention.
Embodiment
Asphalt belongs to a kind of heterogeneous composite material, and gathering materials can not neglect as its major technique support source effect
Depending on.Gathering materials itself also has polytropy and complexity, it is difficult to be theorized and method with current theoretical.The design method
Under mineral aggregate gradation external interference factor it is few, combined between gathering materials according to same accumulation and force way, performance is more excellent.
Specific embodiment of the invention given below, for further illustrating the present invention.These embodiments are only used for ability
Field technique personnel sufficiently understand the present invention, rather than for limiting the scope of the present invention.It is every technical solution of the present invention it
The equivalents of upper progress or replacement belong to claimed interest field.
Embodiment 1：
The Emulsified Asphalt Mixture gradation design method of the embodiment comprises the following steps：
(1) embodiment is by taking AC-16 as an example, and n values take 5, and its multistage screen size, the corresponding level of screen size at different levels are mixed
Limit level corresponding with screen sizes at different levels is shown in Table 1 with lower limit；
(2) percentage P (x) and x/x is passed through with accumulative to level with fractal theorymaxTaking double-log respectively, (X is sieve aperture chi
It is very little, xmaxFor maximum screen size), it the results are shown in Table 1；
The aggregate grading of table 1 (AC-16)
(3) optimum linear is carried out to the grading curve (AC-16 upper and lower limit) under log-log coordinate using least square method
Fitting obtains straight line one, straight line two, and makees at the minimum and maximum place of screen size the straight line three and straight line four of vertical abscissa, four
Bar straight line (straight line one, straight line two, straight line three, straight line four), which intersects, constitutes quadrangle ABCD, sees Fig. 1；
(4) connection quadrangle ABCD diagonal, and calculate its corresponding equation L1, L2(K1<K2), two are cornerwise oblique
Rate is maximum and minimum value of any one level with slope K in quadrangle, is shown in Table 2；
(5) by slope interval (K1, K2) be divided into five parts, that is, obtain K1, K3, K4, K5, K6, K2(n is more than six straight slopes
Equal to 4).Simultaneously in quadrangle select a key point S (herein choose the cornerwise intersection point of quadrangle, coordinate for (- 0.4101,
1.7780)), key point S and straight slope K is that can determine that linear equation, obtains six linear equations, is shown in Table 2；
The slope and its equation of fitting a straight line are matched somebody with somebody by the log-log coordinate subordinate of table 2
(6) in log-log coordinate system, by point on abscissa (0.00000, -0.07463, -0.15818, -
0.30103rd, -0.60206, -0.90584, -1.20687, -1.50060, -1.80163, -2.10266, -2.40369), hang down
The vertical line of straight abscissa, obtains vertical line and six straight line (L1、L2、L3、L4、L5、L6) intersection point, (with L1Exemplified by when intersecting point coordinate
For, (0.00000,1.94081), (- 0.07463,1.91118), (- 0.15818,1.87801), (- 0.30103,
1.82130), (- 0.60206,1.70179), (- 0.90584,1.58119), (- 1.20687,1.46168), (- 1.50060,
1.33507), (- 1.80163,1.22556), (- 2.10266,1.10605), (- 2.40369,0.98654)), each intersection point correspondence
Ordinate be each sieve aperture under log-log coordinate percent of pass, be shown in Table 3.
Level under the log-log coordinate of table 3 matches somebody with somebody accumulative percent of pass
(7) according to the corresponding relation of log-log coordinate and rectangular co-ordinate, (rectangular co-ordinate is with screen size x and the sieve aperture
Accumulative percentage percent of pass is abscissa and ordinate；And log-log coordinate is with x/xmaxWith the accumulative percentage percent of pass P of sieve aperture
(x) logarithm is abscissa and ordinate), the intersecting point coordinate under obtained log-log coordinate system is converted to rectangular coordinate system
In, and the accumulative of maximum sieve aperture by percentage is adapted to 100% (with L1Exemplified by when, the intersecting point coordinate in rectangular coordinate system
For (19.0,100.0), (16.0,93.41), (13.2,86.54), (9.5,75.94), (4.75,57.67), (2.36,
43.69), (1.18,33.18) (0.6,25.37), (0.3,19.26), (0.15,14.63), (0.075,11.11), these points
Constitute a grading curve), you can desired six grading curves are obtained, 4, Fig. 2 is the results are shown in Table.
The design level of table 4 matches somebody with somebody accumulative sieve aperture and passes through percentage
(8) basis《Highway engineering is gathered materials testing regulations》(JTG E42-2005) and《Highway engineering pitch and pitch mixing
Expect testing regulations》The Marshall stability and cleavage strength that (JTG E20-2011) carries out six grading curves are tested, while right
As a result it is fitted；As a result it is as follows：
Experimental water mud：42.5R Portland cements, specific surface area is 332m2/ kg, presetting period 108min, final set
Time 286min；Limestone aggregates：Apparent density is 2.818g/cm3, water absorption rate is 0.3%, and crush values of gathering materials are 14.3%；
Cationic emulsified bitumen：Solid content is 58%, and residue (1.18mm sieves) is 0.03% on sieve, and residuals content is
62.5%, (25 DEG C) of residue needle penetration is 78.5mm, and (15 DEG C) of residue ductility is 77.8cm.
Six aggregate grading is shown in Table 4, prepares cement-emulsified asphalt marshal piece respectively according to following steps：
The 3% of cement substitution aggregate quality, emulsified asphalt：Cement：Limestone aggregates mass ratio is 96：36：1164.Root
According to《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG E20-2011) gathers materials well mixed by load weighted first,
Then emulsified asphalt stirring 90s is added, the cement mix 60s again of respective quality is finally added, points 3 times by the compound mixed
Load die trial (Φ 101.6mm × h63.5mm).It is two-sided it is each it is continuous hit real 50 times, be stripped at room temperature after laterally disposed health 7d.Point
The stability and cleavage strength of other test mixing material.
1. Stabilily parameter
It will be placed in the time in 60 DEG C of constant water bath box before test and survey its Marshall stability after water-bath 0.5h, loading speed is
50mm/min, test and fitting such as Fig. 3.
Can significantly it find out from Fig. 3, with the increase of slope K, first becoming occurs in the stability of compound to be reduced greatly again
Process.Because slope is bigger, the particle diameter gathered materials is bigger.In asphalt, the effect of coarse aggregate resistance external force is most
It is good, skeleton is mutually constituted between coarse aggregate, when slope K is smaller, coarse aggregate constitutes skeleton, but be due to fine aggregate content compared with
Few, the space of compound is excessive, causes stability relatively low；With the increase of fractal dimension, the particle diameter gathered materials reduces, mixture gap
Reduce, stability rise；But after voidage reduces to a certain extent, with increasing for fine aggregate, the skeleton between compound
Structure receives destruction, and its stability starts reduction again.From fitting result it can be seen that performance is optimal when K values now are 0.513.
2. cleavage strength
In diametral compression test, test temperature is 15 ± 0.5 DEG C, and loading speed is 50 ± 5mmmin-1, Poisson's ratio μ is 0.25,
Press strip width is 12.7mm, and test result is shown in Fig. 4.
Fig. 4 test result shows, with the increase of slope K, and the cleavage strength of compound is first raised and reduced afterwards.Because tiltedly
Rate K is smaller, and aggregate size is smaller, and now less, the fine aggregate being primarily due to now is excessive, not only for the cleavage strength of compound
Compound coarse aggregate can not form embedded squeezing structure, and structure density is also poor.With the increase of slope K, coarse aggregate is gradually
Increase, these coarse aggregates gradually form skeleton structure, and part fine aggregate is filled with the space between coarse aggregate, institute well
It is higher with now intensity；When slope K is larger, coarse aggregate is more, mutually forms skeleton structure, but is due to that fine aggregate is very few,
Cause the voidage of compound excessive, and cause the reduction of intensity.From fitting result it can be seen that now K values are 0.521 optimal.
The K values of the compound of comprehensive two strength tests checking, choose both average value, i.e. K is 0.517.
(9) void in mineral aggregate of aggregate grading curve blending material when test slope K is 0.517 respectively, voidage, stably
Degree, cleavage strength and water stability testing.Related experiment according to《Highway engineering is gathered materials testing regulations》(JTG E42-2005) and
《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG E20-2011) is carried out, and test result is as follows：
The parameter index of compound when the K of table 5 is 0.517
Embodiment 2：
According to one AC-16 type aggregate grading of principle design of trial and error procedure, then verify that the level of this method design is matched somebody with somebody and this
The difference on mixture performance that inventive method design level is matched somebody with somebody.Illustrate the advantage that design level of the present invention is matched somebody with somebody.
The embodiment uses trial and error procedure, and acquired results are as shown in table 6.
9.5-16mm:4.75-9.5mm:2.36-4.75mm:0-2.36mm:Miberal powder=28:24:18:25:5.Test raw material
It is same as Example 1, emulsified asphalt：Cement：Limestone aggregates mass ratio is 96：36：1164.Correlated performance experimental result is such as
Shown in table 7.
The formate gradation composition of table 6
The parameter index of the formate gradation composition compound of table 7
Claims (2)
1. a kind of aggregate grading design method for improving Cement-emulsified asphalt mixture intensity, it is characterised in that methods described bag
Include：
(1) determine that multistage screen size, the corresponding level of screen size at different levels that target level is matched somebody with somebody match somebody with somebody the upper limit and screen size pair at different levels
The level answered matches somebody with somebody lower limit；
(2) multistage screen size, the corresponding level of screen size at different levels matched somebody with somebody to target level are corresponding with screen sizes at different levels with the upper limit
Level with lower limit carry out linear fit, obtain straight line one：LogPOn(x)=a Log (x/xmax)+b and straight line two：LogPUnder(x)=
c Log(x/xmax)+d, wherein：X is screen size, xmaxFor maximum screen size, POn(x) match somebody with somebody for the corresponding levels of screen size x
The upper limit, PUnder(x) lower limit is matched somebody with somebody for the corresponding levels of screen size x, a, b, c and d are respectively the linear equation coefficient after linear fit；
(3) straight line one, straight line two, Y-axis and straight line x '=Log (xmin/xmax) composition quadrangle, wherein xminMinimum sieve aperture
Size；
(4) diagonal of the quadrangle is done, two cornerwise intersection points are S, and two cornerwise slopes are respectively K1And K2,
And K1<K2；By [K1,K2] etc. interal separation be n interval：[K1,K3]、[K3,K4]、[K4,K5]、……、[Kn,Kn+1]、[Kn+1,
K2], obtain K3、K4、……、Kn+1, n is more than or equal to 4；
(5) cross point S and be slope respectively K1、K2、K3、K4、K5... and Kn+1N+1 bar straight lines；
(6) each self-corresponding aggregate grading curve of n+1 bar straight lines is done, the compound horse that n+1 bar aggregate grading curves are done respectively has a rest
That stability test and cleavage strength experiment, obtain the Marshall stability and cleavage strength of the compound of every grading curve,
By K1、K2、K3、K4、K5、……、Kn+1It is fitted with corresponding n+1 compound Marshall stability value, according to fitting result
Obtain the corresponding K of Marshall stability maximum of compoundmax1；By K1、K2、K3、K4、K5、……、Kn+1Corresponding n+1 mixed
The cleavage strength value for closing material is fitted, and the corresponding K of cleavage strength maximum of compound is obtained according to fitting resultmax2, cross S
Point does slope for (Kmax1+Kmax2The straight line of)/2, aggregate grading curve is done according to the straight line.
2. the aggregate grading design method of Cement-emulsified asphalt mixture intensity as claimed in claim 1, it is characterised in that n
=5.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883900A (en) * | 2019-01-30 | 2019-06-14 | 中北大学 | The method that single coarse aggregate determines the method for fractal dimension and determines aggregate grading |
| CN112347622A (en) * | 2020-09-27 | 2021-02-09 | 南京航空航天大学 | Grading-based multi-grade particle size crushed stone crushing value estimation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318794A (en) * | 2008-07-16 | 2008-12-10 | 兰州交通大学 | Asphalt mixture mixing proportion design method based on inert solid fractal distribution characteristic |
| CN103526664A (en) * | 2013-10-30 | 2014-01-22 | 江苏宝利沥青股份有限公司 | Determining method suitable for mix proportion of asphalt mixture of heavy traffic road surfaces |
| CN106250642A (en) * | 2016-08-04 | 2016-12-21 | 河北省交通规划设计院 | A kind of aggregate grading design method improving asphalt mechanical property |
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2017
- 2017-03-21 CN CN201710170134.1A patent/CN107056185B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318794A (en) * | 2008-07-16 | 2008-12-10 | 兰州交通大学 | Asphalt mixture mixing proportion design method based on inert solid fractal distribution characteristic |
| CN103526664A (en) * | 2013-10-30 | 2014-01-22 | 江苏宝利沥青股份有限公司 | Determining method suitable for mix proportion of asphalt mixture of heavy traffic road surfaces |
| CN106250642A (en) * | 2016-08-04 | 2016-12-21 | 河北省交通规划设计院 | A kind of aggregate grading design method improving asphalt mechanical property |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883900A (en) * | 2019-01-30 | 2019-06-14 | 中北大学 | The method that single coarse aggregate determines the method for fractal dimension and determines aggregate grading |
| CN109883900B (en) * | 2019-01-30 | 2021-05-25 | 中北大学 | Method for determining fractal dimension of single coarse aggregate and method for determining aggregate gradation |
| CN112347622A (en) * | 2020-09-27 | 2021-02-09 | 南京航空航天大学 | Grading-based multi-grade particle size crushed stone crushing value estimation method |
| CN112347622B (en) * | 2020-09-27 | 2024-02-13 | 南京航空航天大学 | Grading-based multi-grade particle diameter crushed stone crushing value estimation method |
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