CN102173655A - Method for mix design of hot-mix asphalt mixture produced with intermittent mixer - Google Patents
Method for mix design of hot-mix asphalt mixture produced with intermittent mixer Download PDFInfo
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Abstract
The invention relates to a method for mix design of a hot-mix asphalt mixture produced with an intermittent mixer and is characterized in that: the process mix design method comprises the following steps of: mineral mix design, Marshall test, determination of optimal asphalt dosage or oil-stone ratio, mix design test, correction of optimal asphalt dosage or oil-stone ratio and determination of final process mixing proportions of minerals. The step of mineral mix design comprises the procedures of determining initial proportions and designing mineral mixing proportions. The mix design method provided by the invention maintains consistency between process mix design and target mix design, and achieves quantization and visualization of the comparison between process mix design and target mix design. The mix design method effectively prevents the problem of material overflow, reduces loss, increases the running efficiency of equipment, reduces the consumptions of asphalt and mineral powder, ensures the construction quality and reduces the construction cost.
Description
Technical field
The invention belongs to the highway asphalt mixture technical field, specifically be meant a kind of batch mixer production hot-mix asphalt mixture method of proportioning design.
Background technology
At present, hot-mix asphalt mixture (HMA) is applicable to the bituminous pavement of various standard highways.Usually use two class pitch mixing apparatus in the method that hot-mix asphalt mixture is produced, a kind of is batch mixer, and another kind is a continuous mixer.Because the description of materials that China uses is more assorted, variability is big, and adding the batching plant mostly is open-air stock ground, and material moisture content is subjected to weather effect bigger, and the pitch mixing apparatus that uses is a batch mixer at present.
One of core technology is the proportioning design that batch mixer is produced hot-mix asphalt mixture in the existing industry standard (" asphalt highway construction technique normalizing " JTG F40-2004).Produce the mixing proportion design method of hot-mix asphalt mixture at present existing batch mixer, the general three phases that divides, three phases is Target Mixture Ratio (being also referred to as theoretical proportioning) design phase, production mix proportion design phase, production mix proportion Qualify Phase.This triphasic proportioning design is an integral body, must find a trim point by design, and material, performance, economic everyway are satisfied, draws the production of constructing of a standard mix then.But how can balance form organic whole, except that asphalt content, relation therebetween is clear and definite regulation and the method for none relatively between design of hot-mix asphalt mixture Target Mixture Ratio and production mix proportion designed in existing industry standard " asphalt highway construction technique normalizing " JTG F40-2004.
Therefore, produce hot-mix asphalt mixture at the batch mixer of reality and the situation that production mix proportion and Target Mixture Ratio differ greatly often occurs, occur Target Mixture Ratio and the every technical indicator deviation of production mix proportion greatly, cold burden that proportioning is advanced according to target appears and material such as hot aggregate bin flash, the phenomenons such as compound instability produced, so just cause the wayward and waste material of the quality of compound, do not reach the production efficiency of expection, have a strong impact on effective control of cost and construction quality.
At present, some unit in charge of construction reaches the hot-mix asphalt mixture production purpose close with Target Mixture Ratio in actual hot-mix asphalt mixture construction, adopt the vibratory screening apparatus of batch mixer hot screen branch usefulness to produce the consistent or close measure of specification of using sieve with used gathering materials of compound, the sieving capacity of the vibratory screening apparatus of corresponding same specification should be suitable, makes the cold specification of the gathering materials purpose close or identical with grating of gathering materials with the hot aggregate bin of batch mixer to reach.And in actual production often because the variable effect of various factors (all influential to the sieving capacity of sieve) as factors such as the inclination angle of mixture gradation, the kind of gathering materials and type, the clean level of gathering materials, sieve aperture, sieve and oscillation forces, can not reach the suitable target of sieving capacity (vibratory screening apparatus of set batch mixer hot screen branch usefulness and the sieve of production with the corresponding same specification of sieve that gather materials), the proportioning design effect of its hot-mix asphalt mixture is unsatisfactory.
Summary of the invention
The objective of the invention is for solving the proportioning designing technique problem of existing hot-mix asphalt mixture, overcome existing deficiency, provide a kind of can in the hot-mix asphalt mixture proportioning design, making to produce the batch mixer production hot-mix asphalt mixture method of proportioning design that has good unity with Target Mixture Ratio.
The technical solution adopted in the present invention is for achieving the above object:
Batch mixer is produced the hot-mix asphalt mixture method of proportioning design, comprises Target Mixture Ratio design, production mix proportion design, production mix proportion checking; It is characterized in that: the design of described production mix proportion contains again: the design of mineral aggregate proportioning, Marshall Test, determine best asphalt content or bitumen aggregate ratio, proportioning design check, revise best asphalt content (or bitumen aggregate ratio) and the mineral aggregate proportioning is determined the final production proportioning; Described mineral aggregate proportioning design comprises determines preliminary ratio and two steps of design mineral aggregate proportioning, wherein:
The first, determine preliminary ratio: enter the preliminary ratio that ratio that the hot aggregate bin of batch mixer gathers materials is determined the hot aggregate bin of batch mixer according to Target Mixture Ratio design charging;
The second, design mineral aggregate proportioning: after the preliminary ratio of the hot aggregate bin of determining batch mixer, the mineral aggregate gradation of reference object proportioning design is adjusted preliminary ratio, and try to join batch mixer hot aggregate bin, reclaim the proportioning of powder, filler; Keep the mineral aggregate that comes out from batch mixer consistent, should make the proportioning (discharging ratio) of the hot aggregate bin of batch mixer identical with charge proportion or close with the gradation composition that enters cold burden;
The 3rd, carry out Marshall Test with the predefined asphalt content of asphalt content correction or the bitumen aggregate ratio of surveying, determine best asphalt content or bitumen aggregate ratio;
The 4th, carry out requiring to calculate the amount of material and invalid material of scattering and disappearing in the production mix proportion design check, and revise the ratio of existing production mix proportion design medium pitch, filler, draw the final production proportioning.
In the preliminary ratio of described adjustment, requirement makes in grade mineral aggregate gradation that fits over the Target Mixture Ratio design+1.0% ,-0.5% scope, and each hot aggregate bin proportion adjusting range of batch mixer is controlled in 2%, and when a shared total mineral aggregate ratio of feed bin surpasses 30%, and each hot aggregate bin proportion adjusting range of batch mixer can suitably be relaxed and is controlled in 3%～4%.
The realization principle of mineral aggregate proportioning design among the present invention
1, determines preliminary ratio in the mineral aggregate proportioning design, i.e. the hot aggregate bin of the batch mixer charge proportion derivation of equation of gathering materials
In the preliminary determination of ratio of the hot aggregate bin proportioning of production mix proportion design discontinuous formula amalgamator, the ratio of gathering materials with each hot aggregate bin that enters batch mixer according to Target Mixture Ratio design charging is preliminary ratio.
Batch mixer turnover aggregate quality balance, the cold burden that enters batch mixer enters into each hot aggregate bin and recovery powder storehouse of batch mixer, various cold burdens keep certain charge proportion (in dry mass) to the batch mixer charging always, then entering the charge proportion (mass ratio) that each hot aggregate bin of batch mixer gathers materials relatively also is constant, intermittently the discharging ratio of each hot aggregate bin of batch mixer should be identical with charge proportion or close aborning, otherwise will cause the material relative deficiency of hot aggregate bin of indivedual batch mixers or superfluous relatively, material such as just common flash phenomenon, there are gather materials relative deficiency or superfluous relatively explanation to change from batch mixer mineral aggregate that comes out and the gradation composition that enters cold burden, therefore, consistent with the gradation composition that enters cold burden for maintenance from the mineral aggregate that batch mixer comes out, should make the proportioning (discharging ratio) of the hot aggregate bin of batch mixer identical with charge proportion or close.
The mineral aggregate of the compound that hot-mix asphalt mixture uses have the n kind gather materials A, B, C ..., N and filler F (belong to directly and adding, a kind of and more than one indistinctions, the unified filler of can be regarded as) forms, the ratio that the various ore deposits of Target Mixture Ratio gather materials is A: B: C: ...: N: F=a: b: c: ...: n: f, the hot aggregate bin of batch mixer be divided into u batch mixer hot aggregate bin I, II, III ..., U and reclaim powder storehouse R, calculate the charge proportion of the hot aggregate bin of batch mixer.
The gather materials ratio of the design of proportioning according to target of various ore deposits is A: B: C: ...: N=a: b: c: ...: n is to the batch mixer charging.Entered the gathering materials and reclaim powder storehouse R and reclaim this specification dust that gathers materials and show of each hot aggregate bin of batch mixer gathering materials of every kind of specification
The A A that gathers materials
1, A
2, A
3... A
u, A
Reclaim powder
The B B that gathers materials
1, B
2, B
3... B
u, B
Reclaim powder
The C C that gathers materials
1, C
2, C
3... C
u, C
Reclaim powder
… …
The N N that gathers materials
1, N
2, N
3... N
u, N
Reclaim powder
The mineral aggregate ratio of Target Mixture Ratio can be expressed as
A∶B∶C∶…∶N＝a∶b∶c∶…∶n
=(A
1+ A
2+ A
3+ ... + A
u+ A
Reclaim powder): (B
1+ B
2+ B
3+ ... + B
u+ B
Reclaim powder): (C
1+ C
2+ C
3+ ... + C
u+ C
Reclaim Powder): ...: (N
1+ N
2+ N
3+ ... + N
u+ N
Reclaim powder)
The charge proportion in each hot aggregate bin of batch mixer and recovery powder storehouse can be expressed as
Ⅰ∶Ⅱ∶Ⅲ∶…∶U∶R
=(A
1+ B
1+ C
1+ ... + N
1): (A
2+ B
2+ C
2+ ... + N
2): (A
3+ B
3+ C
3+ ... + N
3): ...: (A
u+ B
u+ C
u+ ... + N
u): (A
Reclaim powder+ B
Reclaim Powder+ C
Reclaim powder+ ... + N
Reclaim powder)
Target Mixture Ratio design mineral aggregate is formed (A
1+ A
2+ A
3+ ... + A
u+ A
Reclaim powder): (B
1+ B
2+ B
3+ ... + B
u+ B
Reclaim powder): (C
1+ C
2+ C
3+ ... + C
u+ C
Reclaim powder): ...: (N
1+ N
2+ N
3+ ... + N
u+ N
Reclaim powder) form (A with the mineral aggregate in each hot aggregate bin that enters batch mixer and recovery powder storehouse
1+ B
1+ C
1+ ... + N
1): (A
2+ B
2+ C
2+ ... + N
2): (A
3+ B
3+ C
3+ ... + N
3): ...: (A
u+ B
u+ C
u+ ... + N
u): (A
Reclaim powder+ B
Reclaim powder+ C
Reclaim powder+ N
Reclaim powder) be consistent, the hot aggregate bin proportioning of batch mixer and the mineral aggregate composition of Target Mixture Ratio are reached unanimity, should make the proportioning (the discharging ratio of the hot aggregate bin of batch mixer just) of each hot aggregate bin of batch mixer identical with charge proportion or close, the charge proportion of the hot aggregate bin of batch mixer is an I: II: III: ...: U=(A
1+ B
1+ C
1+ ... + N
1): (A
2+ B
2+ C
2+ ... + N
2): (A
3+ B
3+ C
3+ ... + N
3): ...: (A
u+ B
u+ C
u+ ... + N
u).
Asking for of each hot aggregate bin charge proportion of batch mixer
The various ore deposits ratio A of proportioning: B: the C according to target that gathers materials: ...: N=a: b: c: ...: n enters the charging quality m of the hot aggregate bin of the individual batch mixer of i (i is more than or equal to 1 natural number smaller or equal to u) to the batch mixer parallel feeding
iThe summation A of the hot aggregate bin aggregate quality that equals gathering materials of all size to enter i batch mixer
i+ B
i+ C
i+ ... + N
i
m
1 mixes=A
1 mixes+ B
1 mixes+ C
1 mixes+ ... + N
1 mixes
m
2 mix=A
2 mix+ B
2 mix+ C
2 mix+ ... + N
2 mix
m
3 mix=A
3 mix+ B
3 mix+ C
3 mix+ ... + N
3 mix
… …
m
U mixes=A
U mixes+ B
U mixes+ C
U mixes+ ... + N
U mixes
The charge proportion of each hot aggregate bin of batch mixer
I
Mix: II
Mix: III
Mix: ...: U
Mix
=(A
1 mixes+ B
1 mixes+ C
1 mixes+ ... + N
1 mixes): (A
2 mix+ B
2 mix+ C
2 mix+ ... + N
2 mix): (A
3 mix+ B
3 mix+ C
3 mix+ ... + N
3 mix Close): ...: (A
U mixes+ B
U mixes+ C
U mixes+ ... + N
U mixes)
=m
1 mixes: m
2 mix: m
3 mix: ...: m
U mixes
The summation m of each the hot aggregate bin aggregate quality that the gathering materials of all size enters batch mixer
1 mixes, m
2 mix, m
3 mix..., m
U mixesDirectly measure data by the batch mixer metering system.
The influence of uncertain factor may produce synergistic effect in the practical application, for the reliability that guarantees data with instruct stably manufactured also should ask for the value of the quality of each hot aggregate bin that gathering materials of every kind of specification enters batch mixer, the value of the quality of each hot aggregate bin that enters batch mixer of gathering materials of every kind of specification is not easy to obtain in the actual tests process, take the gather materials mode of charging respectively of mineral aggregate list kind specification to ask for approximation, the test-results that dual mode is obtained is compared correction mutually, gets the ratio that hot aggregate bin that close value is defined as batch mixer gathers materials.
Mineral aggregate list kind specification is gathered materials successively respectively to the batch mixer charging, measure the gather materials amount of each hot aggregate bin of entering batch mixer of this specification, single plant the unit time flow that specification is gathered materials and gathered materials to the unit time of batch mixer charging flow this specification during as far as possible near ordinary production, the adjustable big unit time flow that gathers materials of the less specification of consumption reduces error.
The gather materials quality of dust of quality and this specification of recovery that reclaims powder storehouse R that the independent charging of gathering materials of every kind of specification enters each hot aggregate bin of batch mixer is ignored a spot of scattering and disappearing, and then has
A
Charging=A
1 is single+ A
2 is single+ A
3 is single+ ... + A
U is single+ A
Reclaim the powder list
B
Charging=B
1 is single+ B
2 is single+ B
3 is single+ ... + B
U is single+ B
Reclaim the powder list
C
Charging=C
1 is single+ C
2 is single+ C
3 is single+ ... + C
U is single+ C
Reclaim the powder list
… …
N
Charging=N
1 is single+ N
2 is single+ N
3 is single+ ... + N
U is single+ N
Reclaim the powder list
Quality that each hot aggregate bin that enters batch mixer of gathering materials gathers materials and the quality that reclaims powder directly measure data by the batch mixer metering system, as the amount that reclaims powder is difficult for recording or scatter and disappear when serious, can adopt predication method, the amount that reclaims powder is by gather materials 0.4～0.9 conversion (the strong appropriate to the occasion capping of batch mixer air inducing, air inducing take off limit when weak) of the following granule content of 0.075mm of this specification.
The gather materials ratio of Target Mixture Ratio of various ore deposits is
A∶B∶C∶…∶N＝a∶b∶c∶…∶n
Then every kind of specification is gathered materials and at the shared per-cent of mineral aggregate total amount is
… …
Plant the specification charging respectively of gathering materials and calculate and gather materials by single according to the ratio A of Target Mixture Ratio mineral aggregate: B: C: ...: N=a: b: c: ...: the n feed time have a rest the formula amalgamator each hot aggregate bin and reclaim the charge proportion in powder storehouse
Every kind of specification is gathered materials at the calculation equation substitution following formula of the shared per-cent of mineral aggregate total amount, eliminate common factor formula, then have
The charge proportion of each hot aggregate bin of batch mixer
Gather materials and compare verification mutually by proportioning parallel feeding and single specification test-results that charging dual mode respectively obtains of gathering materials of planting, the average single specification of planting is gathered materials the test-results of the charging respectively and the proportioning parallel feeding according to target of gathering materials as charge proportion, for keeping the hot aggregate bin input and output material balance of batch mixer, consistent with the mineral aggregate gradation of cold burden charging, same ratio is selected in discharging.The preliminary ratio of gathering materials as the hot aggregate bin of production mix proportion batch mixer just with the charge proportion of the hot aggregate bin of batch mixer.
2, batch mixer production mix proportion grating principle of design
Consider the to gather materials influence of factors such as bump breakage, abrasion, air inducing emptying dust be lost, gather materials and be changed to a small amount of aggregate particle particle diameter and diminish, damaged a small amount of chip and the dust of wearing away, the air inducing emptying causes dust to scatter and disappear, but the result of variations how character of gathering materials, mix equipment performance gather materials all is: aggregate size does not have considerable change or the small quantities of particles particle diameter diminishes, and dust has a small amount of minimizing or a small amount of increase is arranged.Do not have under the situation of obvious minimizing (lost dust scatters and disappears with the breeze compensation more at most) at fine aggregate and the following granule content of 0.075mm, in theory the grating of the proportioning of each hot aggregate bin of the batch mixer of Que Dinging should near or slightly be narrower than the Target Mixture Ratio grating, the situation thicker than Target Mixture Ratio grating can not appear in mineral aggregate gradation, that is to say that gradation curve of mineral aggregate and target graduation curve should be very approaching, superposed part should be at the target graduation curve by the big side of percentage.
Outstanding substantive distinguishing features of the present invention and significant beneficial effect are:
1, at first proposed the method for design that production mix proportion and Target Mixture Ratio are consistent, this is the core of the inventive method, and with production mix proportion and concrete quantification and the visualize of the conforming contrast of Target Mixture Ratio.
2, bituminous weighing employing is poured out weighing method and is accurately measured asphalt content, and with default asphalt content of the measured value correction of the actual asphalt quality of pouring out or bitumen aggregate ratio, design is more near practical application in the design.
3, the production mix proportion design avoids taking place material phenomenons such as flash effectively in conjunction with adopting batch mixer turnover aggregate quality to determine the hot aggregate bin ratio of batch mixer, has reduced loss, has improved equipment operation efficient.
4, calculate to estimate scatter and disappear material, amount adjustment invalid and the poor efficiency material reduced the consumption of pitch, breeze, and the assurance construction quality has also reduced engineering cost.
The present invention makes the production hot-mix asphalt mixture make performance more stable, guarantees construction quality, has simplified operation control simultaneously, and has reduced engineering cost.
Description of drawings
Fig. 1 is the formate gradation composition curve synoptic diagram of the Target Mixture Ratio of the embodiment of the invention.
Fig. 2 is that production mix proportion formate gradation composition curve comparison Target Mixture Ratio formate gradation composition curve synoptic diagram is joined in the examination of the embodiment of the invention.
Fig. 3 is the formate gradation composition curve synoptic diagram of the production mix proportion of the embodiment of the invention.
Fig. 4 is the contrast synoptic diagram of Fig. 1 and Fig. 3.
Embodiment
Batch mixer is produced the hot-mix asphalt mixture method of proportioning design, comprises Target Mixture Ratio design, production mix proportion design, production mix proportion checking; The design of described production mix proportion contains again: the design of mineral aggregate proportioning, Marshall Test, determine best asphalt content (or bitumen aggregate ratio), proportioning design check, revise best asphalt content (or bitumen aggregate ratio) and the mineral aggregate proportioning is determined the final production proportioning.
They are below production mix proportion design concrete steps:
1, mineral aggregate proportioning design
The design of mineral aggregate proportioning comprises determines preliminary ratio and two steps of design mineral aggregate proportioning,
(1), determines preliminary ratio
According to Target Mixture Ratio design charging, the ratio of gathering materials with the hot aggregate bin that enters batch mixer is preliminary ratio, mix to batch mixer charging and b, single specification of planting and gather materials and ask for the charge proportion of the hot aggregate bin of batch mixer respectively to batch mixer charging dual mode respectively with a, all size proportioning of gathering materials according to target, the test-results that a, b dual mode are obtained is on average as the hot aggregate bin of the batch mixer charge proportion that gathers materials.
The compound that hot-mix asphalt mixture uses have the n kind gather materials with A, B, C ..., N represents, filler is that F (belongs to directly and adding, a kind of and more than one indistinctions, the unified filler F that can be regarded as), the ratio that Target Mixture Ratio designs various mineral aggregates is A: B: C: ...: N: F=a: b: c: ...: n: f, batch mixer have the hot aggregate bin of u batch mixer be divided into I, II, III ..., U represents, reclaiming the powder storehouse is R.
A, all size gather materials the ratio of the design of proportioning according to target for to the batch mixer charging, the charge proportion of each hot aggregate bin of batch mixer
I
Mix: II
Mix: III
Mix: ...: U
Mix=m
1 mixes: m
2 mix: m
3 mix: ...: m
U mixes
M in the formula
1 mixes, m
2 mix, m
3 mix..., m
U mixes---be the summation of each hot aggregate bin aggregate quality of gathering materials of all size entering batch mixer, treat that the stable back of charging measures the charging quality of the hot aggregate bin that flowed into each batch mixer in 2～5 minutes by the batch mixer metering system.
B, measure the gather materials quality of dust of quality from each hot aggregate bin of batch mixer to the batch mixer charging and this specification of recovery that reclaims powder storehouse R of gathering materials separately of every kind of specification entering, calculate the ratio A of proportioning: B: the C according to target that respectively gathers materials: ...: N=a: b: c: ...: n is to the have a rest charge proportion of each hot aggregate bin of formula amalgamator of batch mixer feed time
A, b in the formula, c ... n---for respectively gathering materials at Target Mixture Ratio A: B: C: ...: N=a: b: c: ...: proportion among the n;
A
1 is single, A
2 is single, A
3 is single... A
U is single
B
1 is single, B
2 is single, B
3 is single... B
U is single
C
1 is single, C
2 is single, C
3 is single... C
U is single
… …
N
1 is single, N
2 is single, N
3 is single... N
U is single---for the n kind gather materials A, B, C ..., every kind of N the quality of gathering materials and entering each hot aggregate bin of batch mixer to the batch mixer charging separately, treat that the stable back of charging measures the charging quality of the hot aggregate bin that flowed into each batch mixer in 2～5 minutes by the batch mixer metering system;
A
Charging, B
Charging, C
Charging..., N
Charging---for the A that gathers materials, B, C ..., the gathering materials separately of every kind of N to the quality of batch mixer charging, ignore a spot of lost A
Charging, B
Charging, C
Charging..., N
ChargingCan calculate by following formula
A
Charging=A
1 is single+ A
2 is single+ A
3 is single+ ... + A
U is single+ A
Reclaim the powder list
B
Charging=B
1 is single+ B
2 is single+ B
3 is single+ ... + B
U is single+ B
Reclaim the powder list
C
Charging=C
1 is single+ C
2 is single+ C
3 is single+ ... + C
U is single+ C
Reclaim the powder list
… …
N
Charging=N
1 is single+ N
2 is single+ N
3 is single+ ... + N
U is single+ N
Reclaim the powder list
In the formula: A
Reclaim the powder list, B
Reclaim the powder list, C
Reclaim the powder list..., N
Reclaim the powder list---be the gather materials quality of dust of this specification of recovery of independent feed recovery powder storehouse R of gathering materials of every kind of specification, as the amount that reclaims powder is difficult for recording or scatter and disappear when serious, can adopt predication method, the amount that reclaims powder is by gather materials 0.4～0.9 conversion (the strong appropriate to the occasion capping of batch mixer air inducing takes off limit when weak) of the following granule content of 0.075mm of this specification.
(2), design mineral aggregate proportioning
By the industry standard prescriptive procedure get hot aggregate bin according to the batch mixer of Target Mixture Ratio charging gather materials sample, reclaim the powder sample, the hot aggregate bin of testing each batch mixer gathers materials and reclaims the grating of powder.
Mineral aggregate gradation design in the inventive method, its special character is:
A, definite powder ratio that reclaims
Breeze and recovery powder determination of ratio, do not adjust the preliminary ratio that the hot aggregate bin of batch mixer gathers materials, breeze and the ratio that reclaims powder are joined in examination, make the following granule content of 0.075mm the following granule content of Target Mixture Ratio 0.075mm+1.0% ,-0.0% scope in, the preferential adjustment reclaimed the powder consumption, adopt the content of breeze in the Target Mixture Ratio design as far as possible, occur reclaiming powder scatter and disappear serious or when lacking situations such as reclaiming the powder sample with the breeze compensation or replace reclaiming powder.
B, adjust preliminary ratio
The hot aggregate bin proportioning of batch mixer is joined in the examination of comparison Target Mixture Ratio design mineral aggregate gradation, with the grating of the proportioning of each hot aggregate bin of batch mixer near or slightly be narrower than the Target Mixture Ratio grating, superposed part should be not a target by the big side of percentage at the target graduation curve, adjust the preliminary ratio of production mix proportion design, make the mineral aggregate gradation scope of production mix proportion be controlled at the Target Mixture Ratio design mineral aggregate gradation+1.0%,-0.5%, and each hot aggregate bin proportion adjusting range of batch mixer be controlled at 2% with interior (when a shared total mineral aggregate ratio of feed bin surpasses 30%, adjusting range can suitably be loosened in 3%～4%), allow in the time of can not entering grading limit 〉=sieve aperture of 2.36mm exceeds grading limit, and the mineral aggregate gradation of Target Mixture Ratio design+1.5%, in-1.0%, adjust not reach when requiring repeatedly and design again.
C, the adjustment following granule content of 0.075mm and recovery powder;
The filler comparison is adjusted, adjust the following particulate content of 0.075mm, the following granule content of 0.075mm should not be higher than the content of Target Mixture Ratio in the production mix proportion, be controlled at the following granule content of Target Mixture Ratio 0.075mm+0.1% and-0.5% between the Schwellenwert of standard or design document regulation (but must not be lower than); The recovery powder is mainly the following particle of 0.075mm and gathers materials with a small amount of particulate greater than 0.075mm, a part that can be used as breeze reclaims to be used, but the performance index that reclaim powder are general not as good as breeze, and the process heating, drying has produced the sintering variation and may have static, should adjust and reduce the ratio that powder accounts for the filler total amount that reclaims, generally be no more than 25% of filler total amount, can better can be loosened to 50% or higher as reclaiming mealiness.
Breeze with reclaim the powder ratio and add afterwards earlier and subtract, adjust earlier the following granule content of 0.075mm the following granule content of Target Mixture Ratio 0.075mm+1.0% ,-0.0%, the hot aggregate bin proportioning of batch mixer is joined in examination again, last adjust again the following particulate content of 0.075mm the following granule content of Target Mixture Ratio 0.075mm+0.1% and-0.5% between, determine that the mineral aggregate gradation of production mix proportion forms, each adjusts examination, and to join process be interactionally to carry out successively.
2, Marshall Test
Next carry out Marshall Test, with the predefined asphalt content of asphalt content correction (or bitumen aggregate ratio) of actual measurement, other design according to industry standard, do not repeat them here in the Marshall Test.
Pitch measures the weighing method of pouring out that adopts, and its special character is:
The proportion design test is mixed in the operating process of system compound, bituminous weighing employing is poured out weighing method and is accurately measured asphalt content, reduce and scatter and disappear and loss, with pitch, vessel, together heating of spoon (all using flameproof ware and spoon), elder generation is with pitch when taking by weighing pitch, vessel, together weighing of spoon, estimate that again pouring out desire uses the bituminous amount, weighing remains pitch again, vessel, the quality of spoon is calculated and is poured out asphalt quality, as pour out deficiency and fall again, as pour out excess and return a small amount of pitch with little bale-out (strengthening skilled operating skill should arrive less, excess is not poured out as far as possible), the like this adjustment repeatedly until the asphalt quality that takes by weighing out meets the demands, and notes the actual asphalt quality of pouring out then; Pitch weighing is in a special container time, take by weighing the total mass of pitch and container before the use pitch, outwell the quality of weighing container (containing the pitch that wall of container speckles with) behind the pitch, the asphalt quality of actual use is poured out in calculating, in the design to pour out the predefined asphalt content of asphalt content correction (or bitumen aggregate ratio) that weighing method records.
3, determine best asphalt content (or bitumen aggregate ratio)
Design with the predefined asphalt content of asphalt content correction (or bitumen aggregate ratio) of surveying in the Marshall Test, other design by code requirement
4, production mix proportion design check
Carry out production mix proportion design check by code requirement, detect the amount of scattering and disappearing material and invalid (and poor efficiency) material in the test of calculating in the specimen molding.
Calculate and estimate that production mix proportion designs the amount of scattering and disappearing material and invalid (and poor efficiency) material in the check test, suitably adjust asphalt content and breeze (and reclaiming powder) and fine aggregate consumption, mix and heat the compound that is bonded in the test of mixing asphalt and marshal piece moulding on the instruments such as mixing pot, vessel, this part material is mainly pitch, breeze and a spot of fine aggregate, therefore the composition influence to whole material can not be ignored, the compound material that these material mainly divide two portions part not enter the moulding marshal piece has directly lost this part material and has been the material that scatters and disappears; Another part material can scrape off by careful operation, but does not reach other material same structure function in test specimen, and the mechanical function of test specimen is descended just invalid (and poor efficiency) material.
The loss material can be calculated according to testing data and obtain, in the making processes of test specimen, test specimen is mixed the system compound and is made test specimen one by one, calculate gathering materials of single test specimen, pitch, the requirement of breeze, gathering materials of oven dry in advance by a weighing of each test specimen, the weighing recording quality that gathers materials before compound is mixed system once more that is heated to after the mix temperature (need be done proof test, be put in cooling back weighing quality in the moisture eliminator gathering materials after the mix temperature with being heated to, convert and cool off relation conefficient preceding and cooling back quality, extrapolate and be heated to the actual mass that the mix temperature is gathered materials, checking is gathered materials and is heated the quality change of front and back), gather materials abnormal conditions such as in process of the test, whether to occur scattering and disappearing with the quality contrast verification before the heating, be identified for making the aggregate quality m of test specimen with aggregate quality before the heating of the quality correction after the heating
Gather materials, breeze need not heat the quality m that directly weighs needs
Breeze, the bituminous weighing is adopted and is poured out weighing method weighing asphalt quality m
Pitch, make the quality m of weighing test specimen behind the test specimen
Test specimen, product loss material quality is that the various material sums that product is used deduct the test specimen quality and revise number m
Scatter and disappear=m
Gather materials+ m
Breeze+ m
Pitch-m
Test specimen-μ (μ experience correction number, typical compacting method is got 1～3g, is bonded in the oil condition that contains of compound on the instruments such as mixing pot, vessel in the observation experiment, the glossy pitch of compound height more than needed should take off limit, the gloomy suitable capping of compound color).
Invalid (and poor efficiency) material, in the making processes of test specimen, the compound that compound will be bonded on the instruments such as mixing pot, vessel before taking out as far as possible scrapes in advance, admix in other compounds, reduce the occupancy volume of invalid (and poor efficiency) material, unavoidable according to the observation with sampling observation, calculate its occupancy volume in test specimen.
The mensuration of invalid material (and poor efficiency), in the making processes of test specimen, test is mixed the materials of a test specimen with the hot-mix asphalt mixture batch mixer at every turn, in compound taking-up (directly adorning mould) process, to after scrape the compound that is bonded on the instruments such as mixing pot, vessel and carry out weighing m
Scrape, invalid material scrapes mixture quality after being and multiply by correction factor, and correction factor gets 0.3～0.7 (hot-mix asphalt mixture that observation scrapes contain oil condition, the glossy pitch of compound high suitable capping more than needed, the compound color is gloomy should take off limit).
The method that measures of scattering and disappearing material and invalid (and poor efficiency) material medium pitch is got invalid material samples 2～4g and is put into crucible, puts in the High Temperature Furnaces Heating Apparatus (500 ℃～600 ℃) and burns till residue, takes out the crucible cooling.By the usage ratio of every 1g residue 5ml, inject the amine carbonate saturated solution in crucible, leave standstill 1h, it is dry to put into 105 ℃ ± 15 ℃ stove casees.Taking-up is placed in the moisture eliminator cools off, and takes by weighing the residue quality, accurately to 1mg.
The invalid material samples quality of burning exsiccant of quality * residue quality/taking-up that the quality of material and invalid (and poor efficiency) material medium pitch quality=scatter and disappear material and invalid (and poor efficiency) material-scatter and disappear of scattering and disappearing material and invalid (reaching poor efficiency) are expected
5, revise best asphalt content (or bitumen aggregate ratio) and mineral aggregate proportioning and determine the design of final production proportioning
Calculate the amount correction production mix proportion medium pitch of scatter and disappear material and invalid (and poor efficiency), the ratio of filler (breeze, recovery powder etc.) during design is checked according to the 4th step proportioning
The correction of scattering and disappearing material and invalid (reaching poor efficiency) material, material and invalid (and poor efficiency) expect that the medium pitch quality reduces the asphalt content of production mix proportion according to scattering and disappearing.0.075mm following granule content reduction adds correction factor (0.05～0.3%) for the bituminous reduction multiply by Ratio of filler bitumen (production mix proportion design).
To the Consideration of listing in the adjustment that analyses item by item, after determining the preliminary ratio of hot aggregate bin of batch mixer, adjust the hot aggregate bin mineral aggregate ratio of determining batch mixer earlier, secondly determine to reclaim the consumption of fillers such as powder, breeze, next carry out Marshall Test and determine production mix proportion, adjust the suitable consumption of adjusting breeze and reclaiming powder of asphalt content while after the proportioning check once more, take all factors into consideration the production mix proportion of determining use at last.
Dynamically adjust and realize stable production, control the stability of former material and strengthen monitoring, strengthen construction process control and management, improve Construction control horizontal plants operating skill, proportioning is in time dynamically adjusted, to realize stable production, again carry out the production mix proportion design in case of necessity, finally make definite production mix proportion should be suitable for existing starting material, be suitable for mix production, the compound that mix goes out should be suitable for transportation, is suitable for on-the-spot decking and rolling (the actual gentle execution conditions of mechanical water), the road surface entity that construction is finished should be suitable for traffic operation, is suitable for local natural climate and (soaks freeze thawing as sleet, high temperature severe cold etc.).
Example: mineral aggregate proportion design and application in the production mix proportion design of the present invention
Certain engineering is the road surface upper layer of motorway, and mix type is AC-16, uses the SBS modifying asphalt.
Unit in charge of construction selects three kinds of basaltic rubbles for use, is respectively 9.5-19mm (A material), 4.75-9.5mm (B material), 2.36-4.75mm (C material), the machine-processed sand 0-4.75mm of limestone (D material), breeze (F material).
The Target Mixture Ratio design result is as follows: the cold burden ratio is the A material: the B material: the C material: the D material: F material=33: 34: 6: 24: 3, and formate gradation composition sees Table 1, and Fig. 1 is the formate gradation composition curve synoptic diagram of Target Mixture Ratio.
Table 1 hot-mix asphalt mixture Target Mixture Ratio formate gradation composition
The hot aggregate bin of intending with four batch mixers of batch mixer is I storehouse, II storehouse, III storehouse, IV storehouse, reclaims powder storehouse R, the breeze storehouse, the time product about 320T/h.
Solve a problem: the mineral mixture ratio design of production mix proportion design
1.1
The cold burden according to target ratio of proportioning is measured the hot aggregate bin charge proportion of batch mixer to the batch mixer charging
Cold burden is the ratio A material of proportioning according to target: the B material: the C material: D material=33: (survey in each material water ratio at 34: 6: 24, the moisture of deduction cold burden) to the batch mixer charging, according to the time produce to estimate that charging flow velocity (in dry mass) is 5000Kg/min, after treating that charging is stable, stop charging and empty the hot aggregate bin of batch mixer.
Restart charging, measure the charging quality of the hot aggregate bin that flowed into each batch mixer in 2 minutes, carry out three tests and average, measure and the results are shown in Table 2, and the hot aggregate bin that extracts batch mixer for the production Mix Ratio Test gathers materials, reclaims the powder sample.
Each hot aggregate bin charging quality of table 2 proportioning charging according to target
Then the charge proportion of each hot aggregate bin of batch mixer is
1.2
Single specification of planting is gathered materials respectively to the batch mixer charging, measures the hot aggregate bin charge proportion of batch mixer
Determine flow velocity, estimate that cold burden charging flow velocity (in dry mass) is 5000Kg/min, the ratio of cold burden Target Mixture Ratio is the A material: the B material: the C material: D material=33: flow velocity was A material 1701Kg/min, B material 1753Kg/min, C material 309Kg/min, D material 1237Kg/min when each specification was gathered materials ordinary production in 34: 6: 24, selected test flow velocity (survey water ratio in each material, the moisture of deduction cold burden is in dry mass) is as follows
A expects 1701Kg/min
B expects 1753Kg/min
C material 927Kg/min (consumption is less, and the unit time flow amplifies 3 times)
D expects 1237Kg/min
A material, B material, C material, D material gather materials successively respectively to the batch mixer charging for four kinds, after feed is stable, measure the material aggregate quality (test twice average) of the hot aggregate bin that flowed into each batch mixer in 2 minutes respectively, reclaim powder and adopt predication method, calculate by 0.7 of the following granule content of 0.075mm that gathers materials, see Table 3.
Table 3 is single plant specification gather materials respectively each hot aggregate bin of charging, reclaim powder storehouse charging quality
| Gather materials | The I storehouse | The II storehouse | The III storehouse | The IV storehouse | R reclaims the powder storehouse | The charging total amount |
| The A material | 1836 | 1273 | 157 | 126 | ?12 | 3404 |
| The B material | 122 | 1773 | 1347 | 197 | ?15 | 3454 |
| The C material | 11 | 232 | 1206 | 371 | ?12 | 1832 |
| The D material | 64 | 42 | 97 | 2070 | ?133 | 2406 |
Calculate by the above result of measuring and to gather materials: the have a rest charge proportion of each hot aggregate bin of formula amalgamator of 34: 6: 24 ratio feed time according to Target Mixture Ratio A: B: C: D=33
1.3
Average singly kind specification is gathered materials and is distinguished charging test-results I
Mix: II
Mix: III
Mix: IV
Mix=21.9: 31.1: 19.9: 27.1 and gather materials by the test-results I of proportioning parallel feeding
Single: II
Single: III
Single: IV
Single=20.7: 32.5: 20.6: 26.2 as charge proportion, the preliminary ratio of gathering materials as the hot aggregate bin of production mix proportion batch mixer with the charge proportion of the hot aggregate bin of batch mixer.
I
Tentatively: II
Tentatively: III
Tentatively: IV
Tentatively=21.3: 31.8: 20.3: 26.6
2
The hot aggregate bin proportioning adjustment design of batch mixer
2.1
Gather materials by each hot aggregate bin of industry standard prescriptive procedure sampling and testing batch mixer and to reclaim the grating of powder.
2.2
Breeze and recovery powder determination of ratio, do not adjust the preliminary ratio examination that the hot aggregate bin of batch mixer gathers materials and join breeze and the ratio that reclaims powder, make the following granule content of 0.075mm the following granule content of Target Mixture Ratio 0.075mm+1.0% ,-0.0% scope in, the preferential adjustment reclaimed the powder consumption, adopts the content of breeze in the Target Mixture Ratio as far as possible.Join through examination and to determine that breeze is 3%, to reclaim powder be 2%, the hot aggregate bin ratio of the preliminary ratio discontinuous of production mix proportion formula amalgamator
I
Tentatively: II
Tentatively: III
Tentatively: IV
Tentatively=21.3: 31.8: 20.3: 26.6
＝(21.3∶31.8∶20.3∶26.6)×(100％-2％-3％)
＝20.2∶30.2∶19.3∶25.3
2.3
The hot aggregate bin proportioning of batch mixer is joined in the examination of comparison Target Mixture Ratio mineral aggregate gradation, with the grating of the proportioning of each hot aggregate bin of batch mixer near or slightly be narrower than the Target Mixture Ratio grating, superposed part should be not a target by the big side of percentage at the target graduation curve, the preliminary ratio of adjusting production mix proportion make the mineral aggregate gradation scope of production mix proportion be controlled at the Target Mixture Ratio mineral aggregate gradation+1.0%,-0.5%, and each hot aggregate bin proportion adjusting range of batch mixer be controlled at 2% with interior (when a shared total mineral aggregate ratio of feed bin surpasses 30%, adjusting range can suitably be loosened in 3%～4%), allow in the time of can not entering grading limit 〉=sieve aperture of 2.36mm exceeds grading limit, and the Target Mixture Ratio mineral aggregate gradation+1.5%, in-1.0%, adjust not reach when requiring repeatedly and design again.
Join through adjusting examination repeatedly, determine that ratio sees Table 4.
Compare examination with reference to Fig. 1, Fig. 2 and join production mix proportion formate gradation composition curve and Target Mixture Ratio formate gradation composition curve, Fig. 1 is the formate gradation composition curve synoptic diagram of Target Mixture Ratio, Fig. 2 is that production mix proportion formate gradation composition curve comparison Target Mixture Ratio formate gradation composition curve synoptic diagram is joined in examination, examination is joined production mix proportion formate gradation composition curve and the target graduation curve is very approaching as can be seen from Figure 2, and superposed part is passed through the big side of percentage at the target graduation curve substantially.
Table 4: hot-mix asphalt mixture production mix proportion formate gradation composition (comparison Target Mixture Ratio) is joined in examination
2.4
Filler comparison is adjusted, and adjusts the following particulate content of 0.075mm, be controlled at the following granule content of Target Mixture Ratio 0.075mm+0.1% and-0.5% between (but must not be lower than the Schwellenwert that standard or design document are stipulated); The total amount that conciliation recovery powder accounts for filler is no more than 25%, adjusts back hot-mix asphalt mixture production mix proportion formate gradation composition and sees Table 5, and Fig. 3 is the formate gradation composition curve synoptic diagram of production mix proportion.
Contrast the formate gradation composition curve of Target Mixture Ratio and the formate gradation composition curve of production mix proportion with reference to Fig. 1, Fig. 3, Fig. 4, Fig. 1 is the formate gradation composition curve synoptic diagram of Target Mixture Ratio, Fig. 2 is the formate gradation composition curve synoptic diagram of production mix proportion, Fig. 3 is the contrast synoptic diagram of the formate gradation composition of the formate gradation composition of Target Mixture Ratio and production mix proportion, the formate gradation composition curve of the formate gradation composition curve of Target Mixture Ratio and production mix proportion is quite approaching as can be seen from Figure 3, and the mineral aggregate composition reaches unanimity.
Table 5: hot-mix asphalt mixture production mix proportion formate gradation composition
The mineral aggregate proportioning of final definite production mix proportion is
I storehouse: II storehouse: III storehouse: IV storehouse: reclaim powder: breeze=21: 30: 19: 26: 1: 3
Claims (4)
1. batch mixer is produced the hot-mix asphalt mixture method of proportioning design, comprises Target Mixture Ratio design, production mix proportion design, production mix proportion checking; It is characterized in that: the design of described production mix proportion contains again: the design of mineral aggregate proportioning, Marshall Test, determine best asphalt content or bitumen aggregate ratio, proportioning design check, revise best asphalt content or oilstone when the mineral aggregate proportioning determine the final production proportioning; Described mineral aggregate proportioning design comprises determines preliminary ratio and design mineral aggregate proportioning, wherein:
The first, determine preliminary ratio: enter the preliminary ratio that ratio that the hot aggregate bin of batch mixer gathers materials is determined the hot aggregate bin of batch mixer according to Target Mixture Ratio design charging;
The second, design mineral aggregate proportioning: after the preliminary ratio of the hot aggregate bin of determining batch mixer, the mineral aggregate gradation of reference object proportioning design is adjusted preliminary ratio, and try to join intermittent type half-sum machine hot aggregate bin, reclaim the proportioning of powder, filler; Keep the mineral aggregate that comes out from batch mixer consistent, should make the proportioning of hot aggregate bin of batch mixer identical with charge proportion or close with the gradation composition that enters cold burden;
The 3rd, carry out Marshall Test with the predefined asphalt content of asphalt content correction or the bitumen aggregate ratio of surveying, determine best asphalt content or bitumen aggregate ratio;
The 4th, carry out requiring to calculate the amount of material and invalid material of scattering and disappearing in the production mix proportion design check, and revise the ratio of existing production mix proportion design medium pitch, filler, draw the final production proportioning;
In the preliminary ratio of described adjustment, requirement makes in grade mineral aggregate gradation that fits over the Target Mixture Ratio design+1.0% ,-0.5% scope, and each hot aggregate bin proportion adjusting range of batch mixer is controlled in 2%, and when a shared total mineral aggregate ratio of feed bin surpasses 30%, and each hot aggregate bin proportion adjusting range of batch mixer is controlled in 3%～4%.
2. batch mixer according to claim 1 is produced the hot-mix asphalt mixture method of proportioning design, it is characterized in that: the described hot aggregate bin that enters the machine batch mixer according to Target Mixture Ratio design raw material gathers materials, its ratio of gathering materials is preliminary ratio, with a, all size gathers materials proportioning mixing according to target to batch mixer charging and b, single kind specification is gathered materials and is asked for the charge proportion of the hot aggregate bin of batch mixer, a respectively to batch mixer charging dual mode respectively, the test-results that the b dual mode is obtained is on average as the hot aggregate bin of the batch mixer charge proportion that gathers materials; Its a, b dual mode are as follows:
A, all size gather materials the ratio of the design of proportioning according to target for to the batch mixer charging, the charge proportion of each hot aggregate bin of batch mixer
I
Mix: II
Mix: III
Mix: ...: U
Mix=m
1 mixes: m
2 mix: m
3 mix: ...: m
U mixes
M in the formula
1 mixes, m
2 mix, m
3 mix..., m
U mixes---be the summation of each hot aggregate bin aggregate quality of gathering materials of all size entering batch mixer, treat that the stable back of charging measures the charging quality of the hot aggregate bin that flowed into each batch mixer in 2～5 minutes by the batch mixer metering system;
B, measure the gather materials quality of dust of quality from each hot aggregate bin of batch mixer to the batch mixer charging and this specification of recovery that reclaims powder storehouse R of gathering materials separately of every kind of specification entering, calculate the ratio A of proportioning: B: the C according to target that respectively gathers materials: ...: N=a: b: c: ...: n is to the have a rest charge proportion of each hot aggregate bin of formula amalgamator of batch mixer feed time
A, b in the formula, c ... n---for respectively gathering materials at Target Mixture Ratio A: B: C: ...: N=a: b: c: ...: proportion among the n;
A
1 is single, A
2 is single, A
3 is single... A
U is single
B
1 is single, B
2 is single, B
3 is single... B
U is single
C
1 is single, C
2 is single, C
3 is single... C
U is single
… …
N
1 is single, N
2 is single, N
3 is single... N
U is single---for the n kind gather materials A, B, C ..., every kind of N the quality of gathering materials and entering each hot aggregate bin of batch mixer to the batch mixer charging separately, treat that the stable back of charging measures the charging quality of the hot aggregate bin that flowed into each batch mixer in 2～5 minutes by the batch mixer metering system;
A
Charging, B
Charging, C
Charging..., N
Charging---for the A that gathers materials, B, C ..., the gathering materials separately of every kind of N to the quality of batch mixer charging, ignore a spot of lost A
Charging, B
Charging, C
Charging..., N
ChargingCan calculate by following formula
A
Charging=A
1 is single+ A
2 is single+ A
3 is single+ ... + A
U is single+ A
Reclaim the powder list
B
Charging=B
1 is single+ B
2 is single+ B
3 is single+ ... + B
U is single+ B
Reclaim the powder list
C
Charging=C
1 is single+ C
2 is single+ C
3 is single+ ... + C
U is single+ C
Reclaim the powder list
… …
N
Charging=N
1 is single+ N
2 is single+ N
3 is single+ ... + N
U is single+ N
Reclaim the powder list
In the formula: A
Reclaim the powder list, B
Reclaim the powder list, C
Reclaim the powder list..., N
Reclaim the powder list---be the gather materials quality of dust of this specification of recovery of independent feed recovery powder storehouse R of gathering materials of every kind of specification; The compound that hot-mix asphalt mixture uses have the n kind gather materials with A, B, C ..., N represents, filler is F, the ratio that Target Mixture Ratio designs various mineral aggregates is A: B: C: ...: N: F=a: b: c: ...: n: f, batch mixer have the hot aggregate bin of u batch mixer be divided into I, II, III ..., U represents, reclaiming the powder storehouse is R.
3. batch mixer according to claim 2 is produced the hot-mix asphalt mixture method of proportioning design, it is characterized in that: can adopt predication method in the gather materials quality of dust of this specification of recovery of independent feed recovery powder storehouse R of gathering materials of described every kind of specification, the amount that reclaims powder is by gather materials 0.4～0.9 conversion of the following granule content of 0.075mm of this specification, the strong appropriate to the occasion capping of batch mixer air inducing takes off limit when weak.
4. batch mixer according to claim 1 is produced the hot-mix asphalt mixture method of proportioning design, it is characterized in that: be specially in described design mineral aggregate proportioning:
A, definite powder ratio that reclaims
Breeze and recovery powder determination of ratio, do not adjust the preliminary ratio that the hot aggregate bin of batch mixer gathers materials, breeze and the ratio that reclaims powder are joined in examination, make the following granule content of 0.075mm the following granule content of Target Mixture Ratio 0.075mm+1.0% ,-0.0% scope in, the preferential adjustment reclaimed the powder consumption, adopt the content of breeze in the Target Mixture Ratio design as far as possible, occur reclaiming powder scatter and disappear serious or when lacking situations such as reclaiming the powder sample with the breeze compensation or replace reclaiming powder;
B, adjust preliminary ratio
Comparison Target Mixture Ratio design mineral aggregate gradation, the hot aggregate bin proportioning of batch mixer is joined in examination, with the grating of the proportioning of each hot aggregate bin of batch mixer near or slightly to be narrower than the Target Mixture Ratio grating be target, adjust the preliminary ratio of production mix proportion design, make the mineral aggregate gradation scope of production mix proportion be controlled at the Target Mixture Ratio design mineral aggregate gradation+1.0% ,-0.5%; As can not enter grading limit the time, allow 〉=sieve aperture of 2.36mm exceeds grading limit, and the mineral aggregate gradation of Target Mixture Ratio design+1.5%, 1.0% in;
Adjust not reach when requiring repeatedly and design again;
C, the adjustment following granule content of 0.075mm and recovery powder;
Filler comparison is adjusted, and adjusts the following particulate content of 0.075mm, and the following granule content of 0.075mm should not be higher than the content of Target Mixture Ratio in the production mix proportion, be controlled at the following granule content of Target Mixture Ratio 0.075mm+0.1% and-0.5% between.
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| CN107884555A (en) * | 2017-11-08 | 2018-04-06 | 长安大学 | A kind of RAP gradation verification methods of cold recycled asphalt mixture |
| CN109279818A (en) * | 2018-11-23 | 2019-01-29 | 佛山科学技术学院 | A method of index Design framework compact type asphalt mixture is seen based on thin |
| CN109279818B (en) * | 2018-11-23 | 2021-02-12 | 佛山科学技术学院 | Method for designing framework compact asphalt mixture based on mesoscopic indexes |
| CN110146689A (en) * | 2019-05-17 | 2019-08-20 | 河北瑞志交通技术咨询有限公司 | A kind of method of quality control and sampler of asphalt |
| CN110146689B (en) * | 2019-05-17 | 2021-11-12 | 河北交规院瑞志交通技术咨询有限公司 | Quality control method of asphalt mixture and sampler |
| CN111535118A (en) * | 2020-03-25 | 2020-08-14 | 佛山市交通科技有限公司 | Control method of plant-mixed cold regeneration system |
| CN112921748A (en) * | 2021-01-29 | 2021-06-08 | 山东省交通科学研究院 | Production mixing ratio debugging method for dynamic balance of intermittent asphalt mixing station |
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