CN109856377A - The method that roadbase mixed coarse aggregate gradation is determined by crushing test - Google Patents
The method that roadbase mixed coarse aggregate gradation is determined by crushing test Download PDFInfo
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Abstract
The invention discloses the methods for determining roadbase mixed coarse aggregate gradation by crushing test, belong to construction material testing field；The technical problem to be solved is that a kind of crushing test to gather materials by the mixing of pre-determining gradation maximum particle diameter section is provided, the method for determining varying strength mixing aggregate grading, with strong points, gradation is more reasonable；Solve the technical solution of technical problem use are as follows: mixing, which is gathered materials, sieves sample preparation, dyeing, drying, uniformly mixing, it is packed into examination cylinder and carries out crushing test, regrading and weighing are carried out after test, then determine mixing optimum quality ratio, by optimum quality than determining fractal dimension, mixing aggregate grading is determined by fractal dimension；It the composite can be widely applied to construction material testing field.
Description
Technical field
The method that the present invention determines roadbase mixed coarse aggregate gradation by crushing test belongs to construction material test skill
Art field.
Background technique
With urbanization accelerated development and large-scale reconstruction of the old city town, building waste yield will increase year by year, it is contemplated that
To the year two thousand twenty, the newly-increased discharge building waste in China will be more than 5,000,000,000 tons.How building waste is recycled, is urban development and rock
The project that geotechnological Cheng Bixu is faced.In current building waste research on utilization, discarded concrete regeneration is studied more,
But research almost blank is recycled to discarded brick and tile.According to statistics, in building demolition rubbish, discarded concrete accounts for about 25%-
35%, brick and tile fragment (predominantly clay brick) accounts for about 45% or more, and the regeneration of discarded clay brick is urgently paid attention to.Discarded clay
For brick compared with discarded concrete, intensity is relatively low, and water absorption rate is high, but discarded clay brick and discarded concrete are passed through crushing-type
At mixing gather materials and can satisfy the requirement of road basement material as roadbed filling aggregate, and the road inside Shanghai Expo site
Road and Xi Bao high speed reconstruction and extension project B-C02 contract section carry out using.It is real that the building waste of Urban House Demolition is used as roadbase
It tramples and is proved to be feasible, but building waste is as roadbed filling, is the mixing of discarded clay brick and two kinds of materials of discarded concrete
Object, discard clay brick and two kinds of materials of discarded concrete from mechanical property for also there is biggish difference, discard clay brick
The compression strength gathered materials is markedly less than discarded concrete and gathers materials, and interfering with each other between the mixing aggregate particle of the two acts on necessary
Consider how to determine that aggregate grading standardizes that there are blank at present.
Summary of the invention
The present invention overcomes the shortcomings of the prior art, and technical problem to be solved is to provide a kind of pass through to mix collection
The crushing test of material, the method for determining mixed coarse aggregate gradation, with strong points, gradation is more reasonable.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows: roadbase is determined by crushing value test
With the method for mixed coarse aggregate gradation, comprising the following steps:
Step 1: determining the maximum particle diameter j that mixing is gathered materials, unit mm, the mixing is gathered materials by A and the B group of gathering materials of gathering materials
At；
Sample preparation is sieved step 2: gathering materials；
Taking diameter is j, and the square hole screen and next stage standard square hole screen that unit is mm sieve the A and B that gathers materials that gathers materials, and takes this two side
The A and B that gathers materials that gathers materials between hole sizer is as A sample and the B sample that gathers materials of gathering materials；
Step 3: aggregate sample dyes；
It will gather materials A sample and the B sample that gathers materials catches different colours respectively；
Step 4: aggregate sample is dried；
Gathering materials after dyeing and is gathered materials that drying to constant weight for B sample at A sample, is cooled back to room temperature；
Step 5: uniformly mixing is gathered materials in proportion；
Third step gather materials A sample and the B sample that gathers materials after cooling are extracted, gathers materials by different quality than configuration mixing, mixes and stirs
Uniformly, the uniform mixing for forming a variety of different quality ratios is gathered materials；
Examination cylinder is packed into step 6: mixing is gathered materials；
It arbitrarily takes a kind of uniform mixing of mass ratio to gather materials, fills examination cylinder, and count each particle being put into examination cylinder
Maximum, minimum, intermediate three shaft lengths, are accurate to 0.01mm, use formulaThe equivalent grain size of each particle is calculated,
Take the maximum number maximum equivalent partial size d the most of all equivalent grain sizesmax, unit mm, and measure the mixing being fitted into examination cylinder and gather materials
Gross mass M0, unit g；
Step 7: crushing test；
The examination cylinder installed in 5th step is put on press machine, while pressure head being put into examination cylinder and is collected on charge level, pays attention to making
Pressure head is balanced, and wedge does not squeeze examination cylinder side wall, then starts press machine, uniformly applied load reaches within the time of 5min~12min
To total load head, the full payload is not less than the compressive ultimate strength of gather materials A and the B that gathers materials, pressure stabilizing 5s, then off-load, will examination cylinder from
It is removed on press machine, takes out sample；
Step 8: regrading and weighing；
J is arrived with 4.75, all standard square hole screens of the unit between mm, which gather materials to the mixing after crushing, to be sieved, and is sieved to
In 1min without apparent outsifting until, under sieves at different levels mix aggregate quality be denoted as mi, unit g gathers materials progress to mixing
Sorting weighs the A and B that gathers materials that gathers materials under the sieves at different levels sorted out respectively, and A mass of gathering materials under sieves at different levels is denoted as mci, sieves at different levels
Under B mass of gathering materials be denoted as mbi, unit is g, diFor the numerical value of sieve screen-apertures at different levels, precision is accurately to 1mm；
Step 9: the 5th step to the 7th step is repeated several times, the mixing of different quality ratios all in the 4th step is gathered materials and
Two contrast groups are gathered materials crushing and regrading, weighing, and the full payload that when crushing is applied keeps identical；
Step 10: gather materials A and B optimum quality ratio determination of gathering materials；
Gather materials after A and the B mixing crushing and screening that gathers materials, the particle not less than 4.75mm partial size is known as coarse aggregate, with coarse aggregate
Accounting for gross mass percentage is 30%~70%, and to account for coarse aggregate percentage composition not high for B mass of gathering materials after crushing and screening, in coarse aggregate
Be used as boundary value in 25%, answer in contrast initially gather materials A and B mixing ratio of gathering materials is optimum quality ratio, it is corresponding this
It is exactly the B that gathers materials in coarse aggregate in gradation that B mass of gathering materials in the coarse aggregate that mixing ratio crushing test obtains, which accounts for coarse aggregate percentage composition,
Maximum percentage composition；
Step 11: optimum quality is determined than mixing the fractal dimension that gathers materials；
Fractal dimension calculation formula is D=3-k, and D ∈ (2,3), wherein the calculation method of k is as follows:
The quality of the corresponding each particle size interval component gathered materials of optimal mixing ratio crushing test is selected, optimum quality is drawn
Than the relationship distribution curve for mixing aggregate crusher particle accumulated quality and partial size, respectively with og [(mi(di))/M0] absolute value,
log(di/dmax) absolute value be longitudinal and transverse coordinate, wherein mi(di) it be aperture is di, unit is all mixing under the square hole screen of mm
The accumulated quality of aggregate crusher particle, unit g, diFor j, unit is that the square hole of mm is sieved to owning between 4.75mm square hole screen
Standard screen screen-aperture, unit mm, diFor the numerical value of sieve screen-apertures at different levels, it is straight line that relationship, which is distributed curve approximation,；
Optimum quality, which is fitted, with least square method is distributed song than the relationship of mixing aggregate crusher particle accumulated quality and partial size
Line, straight slope after digital simulation, is denoted as k, calculates corresponding fractal dimension D according to k；
Step 12: determining mixing aggregate grading than corresponding fractal dimension D by optimum quality；
Partial size is calculated according to the following formula and is no more than j, and the optimum quality that unit is mm is than mixing the gradation gathered materials；
Wherein: diFor j, unit is that the square hole of mm is sieved to all standard screen screen-apertures between 4.75mm square hole screen, single
Position is mm, diFor the numerical value of sieve screen-apertures at different levels；dminFor the minimum grain size that gathers materials, unit mm；dmaxTo crush preceding maximum etc.
Imitate partial size, unit mm.
The A that gathers materials is discarded concrete, and the B that gathers materials is discarded clay brick.
Aggregate sample dyes in the third step method particularly includes: prepares two dye vats, is inside equipped with different face respectively
The saturated liquid dyestuff of color, dye colour and gathers materials A and the B primary colors that gathers materials has visually identifiable obvious color difference, and will gather materials A sample
B sample is respectively charged into different hanging baskets with gathering materials, then is immersed in different dye vats, keeps impregnating at least 1h at room temperature, really
Protect full and uniform dyeing.
Aggregate sample is dried in 4th step method particularly includes: will gather materials A sample and the B sample that gathers materials are respectively placed in not
It in same tray, is put into baking oven and dries, oven temperature is no more than 100 DEG C, and the time toasted in an oven must not be less than 4h, take
Tray out is placed in container with cover and is cooled to room temperature.
It is that 2:8,4:6,5:5,6:4,8:2 configure five kinds of mixing collection by gather materials A and the B mass ratio that gathers materials in 5th step
Material.
The 5th step pilot scale cylinder internal diameter is maximum equivalent partial size dmax5-10 times, be highly maximum equivalent partial size dmax's
4-8 times, wall thickness 12mm-15mm；Before filler, vaseline or other lubricants are uniformly smeared in examination cylinder inner wall, in three times filler, often
Sub-quantity is substantially the same, and is uniformly fitted into examination cylinder, is vibrated on a vibration table after each filler, plate is covered in vibration processes, covers
Plate is no less than 3kg again, and size is consistent with examination cylinder internal diameter, vibratory compaction, and vibration is no less than 2min every time.
The square hole screen can be changed to round-hole mesh.
The present invention has the advantages that compared with prior art.
Completely new the invention proposes one kind, fractal dimension is calculated using crushing test, further determines roadbase
With the method for mixed coarse aggregate gradation, specific aim is very strong, can do experiment for specific mixture material, and final determine is mixed
The optimum quality expected when gradation is closed, and the gradation determined is good, provides good foundation for engineer application.
Detailed description of the invention
Fig. 1 is partial size within the scope of 26.5mm~19mm, the discarded concrete and the mixing of discarded clay brick that mass ratio is 4:6
The relationship distribution curve of coarse aggregate crushed particles accumulated quality and partial size.
Fig. 2 is the grading curve figure of the partial size discarded concrete no more than 26.5mm and discarded clay brick mixed coarse aggregate.
Fig. 3 is the grading curve of the section 19mm~26.5mm partial size.
Specific embodiment
The present invention will be further described in detail with specific example with reference to the accompanying drawing.
The discarded concrete using partial size no more than 26.5mm and discarded clay brick are used as roadbase below mixes rough set
For material, illustrate to determine its optimum quality than the method with gradation, the specific steps are as follows.
Step 1: determining the maximum particle diameter 26.5mm that mixing is gathered materials, the mixing is gathered materials by discarded concrete and is discarded viscous
Cob brick composition.
Sample preparation is sieved step 2: gathering materials；
It takes the standard square hole screen of 26.5mm and 19mm to sieve discarded concrete and discarded clay brick, takes between this two square hole screen
Discarded concrete and discarded clay brick as discarded concrete sample and discarded clay brick sample.
Step 3: aggregate sample dyes；
Prepare two dye vats, is inside equipped with the saturated liquid dyestuff of different colours, dye colour and discarded concrete respectively
There is the identifiable obvious color difference of naked eyes with discarded clay brick primary colors, discarded concrete sample and discarded clay brick sample are filled respectively
Enter in different hanging baskets, then be immersed in different dye vats, keeps impregnating at least 1h at room temperature, it is ensured that full and uniform dyeing.
Step 4: aggregate sample is dried；
By after dyeing discarded concrete sample and discarded clay brick sample be respectively placed in different trays, be put into baking oven
Middle drying, oven temperature are no more than 100 DEG C, and the time toasted in an oven must not be less than 4h, take out tray, be placed on appearance with cover
It is cooled to room temperature in device.
Step 5: uniformly mixing is gathered materials in proportion；
Third step discarded concrete sample after cooling and discarded clay brick sample are extracted, by discarded concrete: discarded viscous
This five kinds of different qualities of cob brick=2:8,4:6,5:5,6:4,8:2 gather materials than configuration mixing, and uniform mixing forms five kinds of not homogeneities
The uniform mixing of amount ratio is gathered materials.
Examination cylinder is packed into step 6: mixing is gathered materials；
The uniform mixing for taking mass ratio to be 6:4 is gathered materials, and examination cylinder is filled, and counts each particle being put into examination cylinder most
Greatly, minimum, intermediate three shaft lengths, are accurate to 0.01mm, are shown in Table 1, use formulaCalculate the equivalent grain of each particle
Diameter takes the maximum number maximum equivalent partial size d the most of all equivalent grain sizesmax=26.78mm；Select internal diameter 150mm, height
The examination cylinder of 100mm, wall thickness 12mm uniformly smear vaseline or other lubricants in examination cylinder inner wall, by discarded clay brick sample point
Filler (every sub-quantity is substantially the same) three times is uniformly fitted into examination cylinder, and measures the gross mass that the mixing being fitted into examination cylinder is gathered materials
M0=1938.16g.
Table 1: the 26.5mm-19mm that discarded concrete and discarded clay brick mass ratio are 6: 4, which gathers materials, counts three axis partial sizes
| Specimen coding | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| d1(mm) | 26.57 | 18.28 | 25.82 | 33.18 | 25.98 | 28.41 | 25.71 | 24.18 | 21.28 | 15.66 |
| d2(mm) | 26.48 | 16.57 | 22.50 | 25.01 | 21.83 | 37.87 | 18.43 | 24.5 | 23.13 | 21.13 |
| d3(mm) | 20.21 | 36.07 | 15.30 | 18.69 | 19.81 | 17.86 | 22.23 | 14.04 | 34.9 | 34.9 |
| d(mm) | 24.22 | 22.19 | 20.71 | 24.93 | 22.39 | 26.78 | 21.92 | 20.26 | 25.80 | 22.60 |
Step 7: crushing test；
The examination cylinder installed in 5th step is put on press machine, while pressure head being put into examination cylinder and is collected on charge level, rotation one
It week contacts it uniformly with sample, pays attention to balancing pressure head, wedge does not squeeze examination cylinder side wall, then starts press machine, uniformly applied
Load, reaches total load head 23MPa, pressure stabilizing 5s within the time of 10min, and examination cylinder is removed from press machine, taken out by then off-load
Sample.
Step 8: regrading and weighing；
Gathered materials with all standard square hole screens between 4.75mm to 26.5mm the mixing after crushing and sieved, is both needed to sieve
Aggregate quality, which is mixed, until in 1min without apparent outsifting, under sieves at different levels is denoted as m (di), unit g gathers materials to mixing
Sorted, by under the sieves at different levels sorted out discarded concrete and discarded clay brick weigh respectively, discarded coagulation under sieves at different levels
Soil is denoted as RC, and quality is denoted as mci, discarded clay brick is denoted as RB under sieves at different levels, and quality is denoted as mbi, unit is g, diFor sieves at different levels
The numerical value of screen-aperture, precision accurately to 1mm, are shown in Table 2.
Table 2 crushes statistic of attribute table after preceding and crushing
Step 9: the 5th step to the 7th step is repeated several times, the mixing of different quality ratios all in the 4th step is gathered materials and
Two contrast groups are gathered materials crushing and regrading, weighing, and the full payload that when crushing is applied keeps identical.
Step 10: discarded concrete and discarded clay brick optimum quality are than determining；
Partial size each discarded concrete between 26.5mm~19mm is obtained by the 9th step, discards the partial size after clay destroys
Distribution results see the table below 3；
The mixing of table 3, which is gathered materials, crushes screening statistical form
| Partial size/mm | Constituent mass/g | Concrete: brick=2:8 | Concrete: brick=4:6 | Concrete: brick=5:5 | Concrete: brick=6:4 | Concrete: brick=8:2 |
| Gross mass M0/g | RB+RC | 1645.49 | 1768.09 | 1867.24 | 1938.16 | 2062.14 |
| 4.75mm~26.5mm aggregate quality/g | RB | 502.47 | 366.88 | 307.41 | 235.99 | 108.42 |
| 4.75mm~26.5mm aggregate quality/g | RC | 290.84 | 554.38 | 713.39 | 868.80 | 1109.03 |
| 4.75mm or less aggregate quality/g | RB+RC | 852.18 | 846.83 | 846.43 | 833.37 | 844.68 |
| 4.75mm or more RB content/% | RB | 63.3 | 39.8 | 30.1 | 21.4 | 8.9 |
| 4.75mm or more RC content/% | RC | 36.7 | 60.2 | 69.9 | 78.6 | 91.1 |
| 4.75mm or more aggregate content/% | RB+RC | 48.2 | 52.1 | 54.7 | 57 | 59 |
| D value | 2.614 | 2.561 | 2.529 | 2.502 | 2.475 |
Note: (1) 4.75mm or more discards clay brick quality/(4.75mm after pressure after 4.75mm or more RB content (%)=pressure
Discarded clay brick+discarded concrete above)；(2) 4.75mm or more discarded concrete after 4.75mm or more RC content (%)=pressure
Quality/(4.75mm or more discards clay brick+discarded concrete after pressure)；(3) 4.75mm or more aggregate content (%)=(after pressure
4.75mm or more discards clay brick quality+discarded concrete quality) gather materials gross mass before/pressure；
It is 30%~70% that coarse aggregate, which accounts for gross mass percentage, discards clay brick content after crushing and screening, in coarse aggregate and accounts for
Coarse aggregate percentage composition is used as boundary value, the initial flue gas concrete answered in contrast and the mixing of discarded clay brick not higher than 25%
Than being optimum quality ratio, clay brick quality is discarded in the coarse aggregate obtained after this mixing ratio crushing test and accounts for coarse aggregate percentage
Content is exactly that clay brick maximum percentage composition is discarded in coarse aggregate, and discarded concrete and discarded clay brick mixing ratio are 6 before crushing:
The coarse aggregate content of 4 and 8:2 is respectively 57% and 59%, is all satisfied this coarse aggregate and accounts for gross mass percentage 30%~70%
Condition, the content that clay brick is discarded in corresponding coarse aggregate is respectively 21.4% and 8.9%, while also meeting coarse aggregate
In discard clay brick quality and account for the condition that coarse aggregate percentage composition is not higher than 25%, from table 3 it is observed that its fractal dimension point
It Wei 2.502 and 2.475.
The acceptance criteria of optimum quality ratio are as follows: successively calculate corresponding particle section content, and draw grading curve figure, together
When Marking Guidelines " highway road surface construction technology detailed rules and regulations JTG/T F20-2015 "[20]Partial size is that 19~26.5mm recommended stage is matched
Curve, as can be seen from Figure 3 discarded concrete is obviously fallen in the gradation that discarded clay brick mixing ratio is 0:1,2:8 and 4:6
Except specification recommended stage is matched, discarded concrete and discarded clay brick mixing ratio are that 5:5 falls in gradation near border.Discarded concrete
It is that 6:4 and 8:2 is fallen completely within gradation section with discarded clay brick mixing ratio, illustrates that incorporation is not higher than in coarse aggregate as a result,
25% discarded clay brick aggregate is reasonably, to influence less on coarse aggregate breakage properties, while being determined and being crushed using lower formula
Point form class determines road base aggregate grading curve reasonability with formula:
Step 11: optimum quality is determined than mixing the fractal dimension that gathers materials；
Draw discarded concrete: when discarded clay brick=be respectively 6:4 and 8:2 mixing aggregate crusher particle accumulated quality with
The relationship distribution curve of partial size, respectively with log [(m (di))/M0] absolute value, log (di/dmax) absolute value be longitudinal and transverse seat
Mark, it is straight line that relationship, which is distributed curve approximation, sees Fig. 1；
With least square method fit correlation distribution curve, straight slope after digital simulation is denoted as k, corresponding fractal dimension D
=3-k, before crushing discarded concrete and discarded clay brick mixing ratio be the fractal dimension of 6:4 and 8:2 be respectively 2.502 and
2.475。
Step 12: determining mixing aggregate grading than corresponding fractal dimension by optimum quality
Optimum quality is calculated according to the following formula to draw than mixing the gradation gathered materials using P (x), di as ordinate and abscissa
Grading curve processed, is shown in Fig. 2；
Wherein dmax==27.67mm, takes dmin=0, calculating process is shown in Table 5；
Table 5: gradation calculating process
| D value | di/mm | 0.075 | 0.15 | 0.3 | 0.6 | 1.18 | 2.36 | 4.75 | 9.5 | 13.2 | 16 | 19 | 26.5 |
| 2.502 | P (x)/% | 5 | 7 | 10 | 15 | 21 | 29 | 42 | 59 | 70 | 77 | 84 | 100 |
| 2.475 | P (x)/% | 4 | 6 | 9 | 13 | 19 | 27 | 40 | 57 | 68 | 76 | 83 | 100 |
It can be seen that by table 3 and the grading curve drawn out when D value is 2.502, nonuniformity coefficient Cu=36.64,
Coefficient of curvature Cc=2.27, when D value is 2.475, nonuniformity coefficient Cu=29.76, coefficient of curvature Cc=2.15, grading curve
Meet Cu>=5 and Cc=1~3, verifying mixed coarse aggregate gradation is good, if taking D value using discarded clay brick angle from maximum
It is 2.502 respective stages with being optimum gradation, clay brick volume is 21% in coarse aggregate at this time.
The embodiment of the present invention is explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Example, within the knowledge of a person skilled in the art, can also make without departing from the purpose of the present invention
Various change out.
Claims (7)
1. the method for determining roadbase mixed coarse aggregate gradation by crushing test, it is characterised in that the following steps are included:
Step 1: determining the maximum particle diameter j that mixing is gathered materials, unit mm, the mixing is gathered materials to be made of the A and B that gathers materials that gathers materials；
Sample preparation is sieved step 2: gathering materials；
Taking diameter is j, and the square hole screen and next stage standard square hole screen that unit is mm sieve the A and B that gathers materials that gathers materials, and takes this two square hole screen
Between the A and B that gathers materials that gathers materials A sample and gather materials B sample as gathering materials；
Step 3: aggregate sample dyes；
It will gather materials A sample and the B sample that gathers materials catches different colours respectively；
Step 4: aggregate sample is dried；
Gathering materials after dyeing and is gathered materials that drying to constant weight for B sample at A sample, is cooled back to room temperature；
Step 5: uniformly mixing is gathered materials in proportion；
Third step gather materials A sample and the B sample that gathers materials after cooling are extracted, is gathered materials by different quality than configuration mixing, uniform mixing,
The uniform mixing for forming a variety of different quality ratios is gathered materials；
Examination cylinder is packed into step 6: mixing is gathered materials；
Arbitrarily take a kind of uniform mixing of mass ratio to gather materials, fill examination cylinder, and count each particle being put into examination cylinder maximum,
Minimum, intermediate three shaft lengths, are accurate to 0.01mm, use formulaThe equivalent grain size for calculating each particle takes all
The maximum number of equivalent grain size maximum equivalent partial size d the mostmax, unit mm, and measure total matter that the mixing being fitted into examination cylinder is gathered materials
Measure M0, unit g；
Step 7: crushing test；
The examination cylinder installed in 5th step is put on press machine, while pressure head being put into examination cylinder and is collected on charge level, pays attention to making pressure head
It balances, wedge does not squeeze examination cylinder side wall, then starts press machine, uniformly applied load reaches total within the time of 5min~12min
Load, the full payload are not less than the compressive ultimate strength of gather materials A and the B that gathers materials, pressure stabilizing 5s, and then off-load will try cylinder from pressure
It is removed on machine, takes out sample；
Step 8: regrading and weighing；
J is arrived with 4.75, all standard square hole screens of the unit between mm, which gather materials to the mixing after crushing, to be sieved, and is sieved to
In 1min without apparent outsifting until, aggregate quality is mixed under sieves at different levels and is denoted as mi, unit g gathers materials point to mixing
It picks, the A and B that gathers materials that gathers materials under the sieves at different levels sorted out is weighed respectively, A mass of gathering materials under sieves at different levels is denoted as mci, under sieves at different levels
B mass of gathering materials is denoted as mbi, unit is g, diFor the numerical value of sieve screen-apertures at different levels, precision is accurately to 1mm；
Step 9: the 5th step to the 7th step is repeated several times, the mixing of different quality ratios all in the 4th step is gathered materials and two
Contrast groups are gathered materials crushing and regrading, weighing, and the full payload that when crushing is applied keeps identical；
Step 10: gather materials A and B optimum quality ratio determination of gathering materials；
Gather materials after A and the B mixing crushing and screening that gathers materials, the particle not less than 4.75mm partial size is known as coarse aggregate, total with coarse aggregate Zhan
Mass percent is 30%~70%, and B mass of gathering materials after crushing and screening, in coarse aggregate accounts for coarse aggregate percentage composition and is not higher than
25% is used as boundary value, and initially gather materials A and the B mixing ratio of gathering materials answered in contrast are optimum quality ratio, and corresponding this mixes
It is exactly to gather materials B in gradation in coarse aggregate most that B mass of gathering materials in the coarse aggregate that composition and division in a proportion crushing test obtains, which accounts for coarse aggregate percentage composition,
Big percentage composition；
Step 11: optimum quality is determined than mixing the fractal dimension that gathers materials；
Fractal dimension calculation formula is D=3-k, and D ∈ (2,3), wherein the calculation method of k is as follows:
The quality of the corresponding each particle size interval component gathered materials after optimal mixing ratio crushing test is selected, optimum quality ratio is drawn
The relationship distribution curve for mixing aggregate crusher particle accumulated quality and partial size, respectively with log [(mi(di))/M0] absolute value,
log(di/dmax) absolute value be longitudinal and transverse coordinate, wherein mi(di) it be aperture is di, unit is all mixing under the square hole screen of mm
The accumulated quality of aggregate crusher particle, unit g, diFor j, unit is that the square hole of mm is sieved to owning between 4.75mm square hole screen
Standard screen screen-aperture, unit mm, diFor the numerical value of sieve screen-apertures at different levels, it is straight line that relationship, which is distributed curve approximation,；
Relationship distribution curve of the optimum quality than mixing aggregate crusher particle accumulated quality and partial size, meter are fitted with least square method
Straight slope after being fitted is calculated, k is denoted as, corresponding fractal dimension D is calculated according to k；
Step 12: determining mixing aggregate grading than corresponding fractal dimension D by optimum quality；
Partial size is calculated according to the following formula and is no more than j, and the optimum quality that unit is mm is than mixing the gradation gathered materials；
Wherein: diFor j, unit is that the square hole of mm is sieved to all standard screen screen-apertures between 4.75mm square hole screen, and unit is
Mm, diFor the numerical value of sieve screen-apertures at different levels；dminFor the minimum grain size that gathers materials, unit mm；dmaxTo crush preceding maximum equivalent grain
Diameter, unit mm.
2. the method according to claim 1 for determining roadbase mixed coarse aggregate gradation by crushing test, feature
Be: the A that gathers materials is discarded concrete, and the B that gathers materials is discarded clay brick.
3. the method according to claim 1 or 2 for determining roadbase mixed coarse aggregate gradation by crushing test, special
Sign is: aggregate sample dyes in the third step method particularly includes: prepares two dye vats, is inside equipped with different colours respectively
Saturated liquid dyestuff, dye colour and gather materials A and the B primary colors that gathers materials has the identifiable obvious color difference of naked eyes, will gather materials A sample with
The B sample that gathers materials is respectively charged into different hanging baskets, then is immersed in different dye vats, keeps impregnating at least 1h at room temperature, it is ensured that
Full and uniform dyeing.
4. the method according to claim 1 or 2 for determining roadbase mixed coarse aggregate gradation by crushing test, special
Sign is: aggregate sample is dried in the 4th step method particularly includes: will gather materials A sample and the B sample that gathers materials are respectively placed in not
It in same tray, is put into baking oven and dries, oven temperature is no more than 100 DEG C, and the time toasted in an oven must not be less than 4h, take
Tray out is placed in container with cover and is cooled to room temperature.
5. the method according to claim 1 or 2 for determining roadbase mixed coarse aggregate gradation by crushing test, special
Sign is: being that 2:8,4:6,5:5,6:4,8:2 configure five kinds of mixing collection by gather materials A and the B mass ratio that gathers materials in the 5th step
Material.
6. the method according to claim 1 or 2 for determining roadbase mixed coarse aggregate gradation by crushing test, special
Sign is: the 5th step pilot scale cylinder internal diameter is maximum equivalent partial size dmax5-10 times, be highly maximum equivalent partial size dmax's
4-8 times, wall thickness 12mm-15mm；Before filler, vaseline or other lubricants are uniformly smeared in examination cylinder inner wall, in three times filler, often
Sub-quantity is substantially the same, and is uniformly fitted into examination cylinder, is vibrated on a vibration table after each filler, plate is covered in vibration processes, covers
Plate is no less than 3kg again, and size is consistent with examination cylinder internal diameter, vibratory compaction, and vibration is no less than 2min every time.
7. the method according to claim 1 or 2 for determining roadbase mixed coarse aggregate gradation by crushing test, special
Sign is: the square hole screen can be changed to round-hole mesh.
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| CN112945810A (en) * | 2021-02-05 | 2021-06-11 | 中北大学 | Construction waste regeneration mixed aggregate gradation determination method |
| CN113740216A (en) * | 2021-09-09 | 2021-12-03 | 北京师范大学 | Air-ground integrated detection method for wide-gradation mixed aggregate |
| CN114804688A (en) * | 2022-06-27 | 2022-07-29 | 山西工程科技职业大学 | Method for determining gradation and mixing ratio of regenerated mixed fine aggregate |
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