CN103264445A - Proportion determination method based on balance coefficient for asphalt mixture hot-aggregate bins - Google Patents
Proportion determination method based on balance coefficient for asphalt mixture hot-aggregate bins Download PDFInfo
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Abstract
The invention relates to a proportion determination method based on a balance coefficient for asphalt mixture hot-aggregate bins. The method comprises the following steps of: (1) determining the grading average value of aggregates with various specifications; (2) determining the proportion of the cold-aggregate bins of a mixing station; (3) determining the balance coefficient of the hot-aggregate bins of the mixing station; (4) determining the grading composition of each hot-aggregate bin, and calculating the theoretical proportion of the dosage of the aggregates of each grade; (5) verifying whether mineral mixture grading is corresponding to synthetic grading under the corresponding proportion; and (6) performing trial mixing verification to finally design the asphalt-aggregate ratio, grading, volume parameters and pavement performance of the mixture in the proportion of the hot-aggregate bins. According to the proportion determination method for the hot-aggregate bins of the asphalt mixture mixing station disclosed by the invention, the problems of material waiting and material overflow brought by the traditional proportion determination method for hot-aggregate bins can be overcome, the production efficiency can be effectively increased, the generation of wastes can be reduced, and the production cost can be saved.
Description
Technical field
The present invention relates generally to road engineering asphalt concrete construction field, being particularly related to asphalt production mix proportion design phase hot aggregate bin ratio determines, comprising each grade specification aggregate grading mean value determine, blending station cold burden storehouse ratio and hot aggregate bin ratio determine, based on the mixture performance checking of equalizing coefficient design.
Background technology
According to the requirement of the current asphalt production technology of China, its blending station equipment is mainly intermittently forced action type asphalt mixing plant, and therefore, the mineral aggregate gradation design needed through Target Mixture Ratio and two stages of production mix proportion.Target Mixture Ratio mainly is to determine the ratio in blending station cold burden storehouse, and production mix proportion mainly is the ratio of determining the blending station hot aggregate bin.Owing to the screen cloth in different apertures from small to large is installed in the hot aggregate bin, the raw material of being come in the cold burden storehouse carry out the refinement screening, are divided into the mineral aggregate of size fractionated, and then mix according to the design grating and to join, and so-called hot aggregate bin ratio that Here it is is determined.
From engineering viewpoint, if only calculate by simple, the hot aggregate bin ratio of determining according to the design grating can be by a plurality of results, for example: certain blending station has 5 hot aggregate bins, is respectively 1# storehouse, 2# storehouse, 3# storehouse, 4# storehouse and 5# storehouse.When being respectively 20:5:35:30:10, each feed bin ratio satisfies the requirement of design grating, and same, when being 25:0:30:30:15, the feed bin ratio also satisfies the requirement of design grating.There is bigger difference in these two groups of ratios, and which is applicable to that more engineering production is the problem that is worth discussion.
The unreasonable of hot aggregate bin ratio will cause in the compound production process, and the feed bin that has causes the reduction of compound production efficiency because material appears waiting for a long time in the charging deficiency, increases production cost; The feed bin that has causes the flash of feed bin because charging is too much, causes raw-material waste, has equally also increased the production cost of compound.
Therefore, in order to improve the production efficiency of compound, save engineering cost, guarantee the quality that compound is produced, the method that proposes the employing equalizing coefficient is determined the method for the hot aggregate bin ratio of compound.
Summary of the invention
Determine the deficiency that method exists according to present China asphalt blending station hot aggregate bin ratio, this paper invents a kind of novel asphalt hot aggregate bin ratio based on equalizing coefficient and determines method.This method can overcome material such as grade, the flash problem that traditional hot feed bin ratio determines that method is brought, and can effectively enhance productivity, reduce waste material and produce, and saves production cost.
Asphalt hot aggregate bin ratio based on equalizing coefficient is determined method, comprises the steps:
1), by engineering compound design, each grade specification gathered materials repeatedly sieves, determine its each particle diameter percent of pass mean value
In the formula:
A
1, A
2A
nUnder-each time screening, the mean value of a certain sieve aperture percent of pass that gathers materials, %;
N-screening number of times, inferior;
2), based on the mean value of each specification aggregate grading in the first step, the synthetic target grating of grading limit is determined blending station cold burden storehouse ratio according to the rules; Simultaneously, according to design grating and blending station vibratory sieve screen size size, determine blending station employed hot aggregate bin quantity n and each hot aggregate bin specification of gathering materials;
3), the blending station hot aggregate bin is emptied, according to the ratio charging of fixed cold burden storehouse, make mineral aggregate sieve aperture by each hot aggregate bin under nature, then the weight M of each hot aggregate bin of computation weigh respectively
i, and the ratio of each hot aggregate bin weight is exactly the equalizing coefficient of hot aggregate bin, sees formula 2;
1# storehouse: 2# storehouse ...: n# storehouse=M
1: M
2: M
n(formula 2)
In the formula:
N-blending station uses the hot aggregate bin number;
M
1, M
2, M
n-each hot aggregate bin weight, Kg;
4), carry out hot aggregate bin screening, determine the composition situation of each hot aggregate bin; Be radix with the equalizing coefficient, it is synthetic to carry out asphalt mixture gradation.
In the described step 4) be radix institute formate gradation composition when satisfying the design grating and requiring with the equalizing coefficient, then carry out next step checking; Otherwise, need under the prerequisite of reference equalizing coefficient, this mixture gradation is carried out theory synthesize, determine its theoretical ratio, and guarantee that this theory ratio as far as possible near equalizing coefficient, carries out next step checking again.
Described checking comprises the checking of mineral mixture gradation and trial mix checking.
Described mineral mixture gradation checking comprises following content:
(1) blending station hot aggregate bin ratio is set at equalizing coefficient or theoretical ratio;
(2) the definite blending station cold burden storehouse ratio charging of proportioning according to target, under the situation of not adding breeze, asphalt binder and additive, carrying out the mineral compound mixes and stirs, can be set at compound the mixing time and mix and stir the designed time, treat the mixing time end, carry out mineral compound sampling screening;
(3) the screening grating of determining at step (2) is considered the actual hot aggregate bin ratio of actual blending station, carries out the correction of grating breeze, and its concrete computational methods are seen formula 3;
P
i=P '
i* (1-P
F)+P
F(formula 3)
In the formula:
P
i-a certain sieve aperture percent of pass after revising, %;
P '
i-actual mineral compound sieves a certain sieve aperture percent of pass, %;
P
F-finally determine breeze proportion in the blending station hot aggregate bin ratio, %.
Preferably: described sampling screening is the blending station screening of taking a sample when stable.
Described sampling screening adopts the 3rd pot of mineral compound that mixes and stirs to carry out sieve test.
Described trial mix checking comprises bitumen aggregate ratio, grating, volume parameter and the pavement performance of compound under the final design hot aggregate bin ratio.
Described trial mix checking particular content and method are as follows:
(A) oilstone grating checking when
The compound of each bitumen aggregate ratio of trial mix is got two parts respectively carry out firing method mensuration bitumen aggregate ratio, get both mean value, and through revising, set the actual bitumen aggregate ratio of blending station under bitumen aggregate ratio as this; Simultaneously, the mineral compound after the burning is carried out sieve test, calculate burning back mineral mixture gradation, and through the grating of revised grating as this asphalt;
(B) volume parameter checking
According to " highway engineering pitch and asphalt testing regulations " (JTJ052-2000) regulation of T0702-2000, to trial mixture moulding marshal piece under the best bitumen aggregate ratio, adopt seal with wax method (T0707-2000) and the corresponding physical index of vacuum method (T0771-1993) mensuration marshal piece respectively, and calculate mixture volume parameter under each bitumen aggregate ratio of checking.
(C) high-temperature stability checking
98% moulding rut test piece according to the corresponding bulk density of best bitumen aggregate ratio, according to " highway engineering pitch and asphalt testing regulations " (JTJ052-2000) regulation of T0719-1993, carry out the wheel tracking test of 60 ℃ of conditions, measure dynamic stability and the relative deformation of asphalt, estimate the high temperature stability performance of this bituminous concrete with this;
(D) low-temperature cracking-resistance checking
98% moulding rut test piece with the corresponding bulk density of compound under the best bitumen aggregate ratio, reach and cut into width after the health stipulated time and be 3cm, highly be the beam type test specimen of 25cm for 3.5cm, length, according to " highway engineering pitch and asphalt testing regulations " (JTJ052-2000) regulation of T0715-1993, according to the local climate characteristics, carry out the girder bend test under the relevant temperature condition, calculate the maximum flexural-tensile strain that produces when destroying, estimate this concrete crack resistance at low-temperature with this.
(E) water stability checking
The Φ 10cm * 10cm cylinder test specimen of compound moulding voidage between 6%～8% with best bitumen aggregate ratio, according to " highway engineering pitch and asphalt testing regulations " (JTJ052-2000) regulation of T0729-2000, carry out the freeze thawing diametral compression test, measure the freeze thawing cleavage strength of bitumen mixture specimen after freeze thawing circulation than TSR, estimate the water stability of this bituminous concrete with this.
Before the described trial mix, need combustion furnace is carried out bitumen aggregate ratio and mineral powder loss demarcation.
After finishing above-mentioned steps, blending station hot aggregate bin ratio and best bitumen aggregate ratio can be determined, and then work such as testing the road making can be carried out.Owing to when a variety of causes causes each specification aggregate grading to change, repeat above-mentioned steps, guarantee mixture performance and the equilibrium of blending station feed.
Determine method according to asphalt blending station hot aggregate bin ratio of the present invention, can overcome material such as grade, flash problem that traditional hot feed bin ratio determines that method is brought, can effectively enhance productivity, reduce waste material and produce, save production cost.
Description of drawings
Fig. 1 target proportioning formate gradation composition
Fig. 2 each hot aggregate bin screening and producting proportion formate gradation composition
[specific embodiment]
Be designed to example with certain engineering AC-10 compound, its concrete steps are as follows:
Step 1: each specification aggregate grading mean value is determined
Each grade of this project AC-10 compound specification of gathering materials is respectively: 0～3 limestone mechanism sand; 5～10 limestone gravels.According to the raw material different batches of marching into the arena, get the material screen branch in stockpile different location, stock ground, its concrete size data such as table 1, table 2, the breeze size data sees Table 3.And add up each specification the gather materials raw-material standard deviation of each particle diameter and the coefficient of variation, see Table 4.
Table 15～10 grade 11 sampling of material screening result
Table 20～3 grade 11 sampling of material screening result
Table 3 breeze sampling screening result
Each specification of table 4 each particle diameter percent of pass variability statistics of gathering materials
As seen, because the uncertain factors such as sampling, stackings of gathering materials, the objective reality of aggregate grading variability is inevitable, so should get the typical value that the mean value that repeatedly sieves grating gathers materials as each grade specification, synthesizes the target grating.
Step 2: blending station cold burden storehouse ratio is determined
According to step 1 size data, get its mean value as this grade specification aggregate grading typical value, and synthetic target grating, determine blending station cold burden storehouse ratio.The cooperation of determining when grading curve figure see Table 5, Fig. 1.
Table 5 Target Mixture Ratio ginseng is joined grating
In sum, this compound target proportioning is: 5～10 rubbles: 0～3 machine-processed sand: breeze=0.75: 0.20: 0.05, namely each grade specification cold burden storehouse charge proportion that gathers materials is: 5～10 rubbles: 0～3 machine-processed sand=79%: 21%.
Step 3: blending station hot aggregate bin equalizing coefficient is determined
This engineering blending station is 4000 types, and its blending station hot aggregate bin top vibratory sieve sieve aperture is respectively: 3mm, 6mm, 11mm, 16mm, 26.5mm.Wherein, the related hot aggregate bin of AC-10 be respectively the 1# storehouse (0～3mm), the 2# storehouse (3～6mm), 3# storehouse (6～11mm).
Comprehensively examine each bunker capacity of rate, determine that finally this engineering material loading time is 3min, treat the end of 3min clock material loading time, it is heavy to measure each hot aggregate bin mineral aggregate respectively, and is scaled each hot aggregate bin ratio, that is, this project is mixed and stirred material hot aggregate bin equalizing coefficient and is:
1# storehouse: 2# storehouse: 3# storehouse=19.7:22.2:58.1
Step 4: with reference to blending station hot aggregate bin equalizing coefficient, determine blending station hot aggregate bin ratio
Each feed bin mineral aggregate of heat-obtaining feed bin carries out the hot aggregate bin screening respectively, and presses the equalizing coefficient formate gradation composition, and whether the checking mixture gradation meets design requirement.The determined equalizing coefficient ratio of step 3, do not consider the breeze consumption, so hypothesis breeze consumption initial setting is 8%, then to account for whole mineral aggregate ratio be 92% to other mineral aggregate, initial setting 3# storehouse: 2# storehouse: 1# storehouse: the ratio of breeze is 53.5:20.4:18.1:8, and in this ratio formate gradation composition.Simultaneously, according to this project hot aggregate bin size data, carry out theory and synthesize, its match ratio is: the 3# storehouse: the 2# storehouse: 1# storehouse: breeze=60:16:16:8.Formate gradation composition and grading curve see Table 6, Fig. 2.
Table 6 each hot aggregate bin screening grating and formate gradation composition
Step 5: mineral mixture gradation checking
According to the theoretical synthetic parameters of this project, carry out the checking of mineral mixture gradation, its checking the results are shown in Table 7.
Table 7 each hot aggregate bin screening grating and formate gradation composition
| Screen size (mm) | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Mineral mixture gradation (%) | 100 | 97.5 | 24.42 | 13.56 | 8.13 | 4.59 | 2.69 | 2.22 | 1.74 |
| Breeze correction (%) | 100 | 97.7 | 30.5 | 20.5 | 15.5 | 12.2 | 10.5 | 10.0 | 9.6 |
| Theoretical ratio grating (%) | 100 | 98.2 | 33.7 | 23.0 | 17.8 | 13.4 | 10.4 | 9.1 | 7.4 |
| Difference | 0.0 | -0.5 | -3.2 | -2.5 | -2.3 | -1.2 | 0.1 | 1.0 | 2.2 |
This shows that the checking of mineral mixture gradation is more or less the same with actual theoretical formate gradation composition, illustrates that each hot aggregate bin size data has certain accuracy.Consider the blending station equilibrium of supply and demand, so finally determine blending station hot aggregate bin ratio be: 3# storehouse: 2# storehouse: 1# storehouse: breeze=53.5:20.4:18.1:8.
Step 6: carry out the compound trial mix, checking mixture volume parameter and pavement performance
According to the final blending station hot aggregate bin ratio of determining, and definite best bitumen aggregate ratio 6.2% of target proportioning stage, carry out trial mix.
It detects data and sees Table 8～10.
Table 8 bitumen aggregate ratio testing result
Annotate: this combustion furnace correction factors formula is: Y=1.2272*X-0.7503
Table 9. burning screening grating
Table 10 volume parameter and pavement performance
In sum, the hot aggregate bin ratio based on equalizing coefficient is determined satisfies the compound designing requirement, and can effectively enhance productivity, reduce the waste material generation, saves production cost.
Claims (9)
1. determine method based on the asphalt hot aggregate bin ratio of equalizing coefficient, comprise the steps:
1), by engineering compound design, each grade specification gathered materials repeatedly sieves, determine its each particle diameter percent of pass mean value
In the formula:
A
1, A
2A
nUnder-each time screening, the mean value of a certain sieve aperture percent of pass that gathers materials, %;
N-screening number of times, inferior;
2), based on the mean value of each specification aggregate grading in the first step, the synthetic target grating of grading limit is determined blending station cold burden storehouse ratio according to the rules; Simultaneously, according to design grating and blending station vibratory sieve screen size size, determine blending station employed hot aggregate bin quantity n and each hot aggregate bin specification of gathering materials;
3), the blending station hot aggregate bin is emptied, according to the ratio charging of fixed cold burden storehouse, make mineral aggregate sieve aperture by each hot aggregate bin under nature, then the weight M of each hot aggregate bin of computation weigh respectively
i, and the ratio of each hot aggregate bin weight is exactly the equalizing coefficient of hot aggregate bin, sees formula 2;
1# storehouse: 2# storehouse ...: n# storehouse=M
1: M
2: M
n(formula 2)
In the formula:
N-blending station uses the hot aggregate bin number;
M
1, M
2, M
n-each hot aggregate bin weight, Kg;
4), carry out hot aggregate bin screening, determine the composition situation of each hot aggregate bin; Be radix with the equalizing coefficient, it is synthetic to carry out asphalt mixture gradation.
2. method according to claim 1 is that radix institute formate gradation composition satisfies the requirement of design grating with the equalizing coefficient in the described step 4), then carries out next step checking; Otherwise, need under the prerequisite of reference equalizing coefficient, this mixture gradation is carried out theory synthesize, determine its theoretical ratio, and guarantee that this theory ratio as far as possible near equalizing coefficient, carries out next step checking again.
3. method according to claim 2, described checking comprise that the checking of mineral mixture gradation and trial mix verify.
4. method according to claim 3, described mineral mixture gradation checking comprises following content:
(1) blending station hot aggregate bin ratio is set at equalizing coefficient or theoretical ratio;
(2) the definite blending station cold burden storehouse ratio charging of proportioning according to target, under the situation of not adding breeze, asphalt binder and additive, carrying out the mineral compound mixes and stirs, can be set at compound the mixing time and mix and stir the designed time, treat the mixing time end, carry out mineral compound sampling screening;
(3) the screening grating of determining at step (2) is considered the actual hot aggregate bin ratio of actual blending station, carries out the correction of grating breeze, and its concrete computational methods are seen formula 3;
P
i=P '
i* (1-P
F)+P
F(formula 3)
In the formula:
P
i-a certain sieve aperture percent of pass after revising, %;
P '
i-actual mineral compound sieves a certain sieve aperture percent of pass, %;
P
F-finally determine breeze proportion in the blending station hot aggregate bin ratio, %.
5. method according to claim 4, described sampling screening is the blending station screening of taking a sample when stable.
6. method according to claim 4, described sampling screening adopts the 3rd pot of mineral compound that mixes and stirs to carry out sieve test.
7. method according to claim 3, described trial mix checking comprises bitumen aggregate ratio, grating, volume parameter and the pavement performance of compound under the final design hot aggregate bin ratio.
8. method according to claim 7, described trial mix checking particular content and method are as follows:
(A) oilstone grating checking when
The compound of each bitumen aggregate ratio of trial mix is got two parts respectively carry out firing method mensuration bitumen aggregate ratio, get both mean value, and through revising, set the actual bitumen aggregate ratio of blending station under bitumen aggregate ratio as this; Simultaneously, the mineral compound after the burning is carried out sieve test, calculate burning back mineral mixture gradation, and through the grating of revised grating as this asphalt;
(B) volume parameter checking
According to " highway engineering pitch and asphalt testing regulations " (JTJ052-2000) regulation of T0702-2000, to trial mixture moulding marshal piece under the best bitumen aggregate ratio, adopt seal with wax method (T0707-2000) and the corresponding physical index of vacuum method (T0771-1993) mensuration marshal piece respectively, and calculate mixture volume parameter under each bitumen aggregate ratio of checking.
(C) high-temperature stability checking
98% moulding rut test piece according to the corresponding bulk density of best bitumen aggregate ratio, according to " highway engineering pitch and asphalt testing regulations " (JTJ052-2000) regulation of T0719-1993, carry out the wheel tracking test of 60 ℃ of conditions, measure dynamic stability and the relative deformation of asphalt, estimate the high temperature stability performance of this bituminous concrete with this;
(D) low-temperature cracking-resistance checking
98% moulding rut test piece with the corresponding bulk density of compound under the best bitumen aggregate ratio, reach and cut into width after the health stipulated time and be 3cm, highly be the beam type test specimen of 25cm for 3.5cm, length, according to " highway engineering pitch and asphalt testing regulations " (JTJ052-2000) regulation of T0715-1993, according to the local climate characteristics, carry out the girder bend test under the relevant temperature condition, calculate the maximum flexural-tensile strain that produces when destroying, estimate this concrete crack resistance at low-temperature with this.
(E) water stability checking
The Φ 10cm * 10cm cylinder test specimen of compound moulding voidage between 6%～8% with best bitumen aggregate ratio, according to " highway engineering pitch and asphalt testing regulations " (JTJ052-2000) regulation of T0729-2000, carry out the freeze thawing diametral compression test, measure the freeze thawing cleavage strength of bitumen mixture specimen after freeze thawing circulation than TSR, estimate the water stability of this bituminous concrete with this.
9. method according to claim 8 before the described trial mix, needs combustion furnace is carried out bitumen aggregate ratio and mineral powder loss demarcation.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103726429A (en) * | 2014-01-26 | 2014-04-16 | 哈尔滨工业大学 | Method for quickly verifying production grading of hot-mixed asphalt concrete |
| CN106468634A (en) * | 2016-09-22 | 2017-03-01 | 广东华路交通科技有限公司 | Improved asphalt immersion Marshall stability test method |
| CN108330779A (en) * | 2018-04-12 | 2018-07-27 | 无锡市万方电子有限公司 | A kind of pitch mixer control system |
| CN108951368A (en) * | 2018-09-05 | 2018-12-07 | 三汽车制造有限公司 | The automatic blending method and automatic batching system and bituminous mixing plant of bituminous mixing plant |
| CN109917115A (en) * | 2019-01-23 | 2019-06-21 | 长安大学 | A kind of asphalt comprehensive performance prediction technique |
| CN110318319A (en) * | 2019-06-04 | 2019-10-11 | 武汉工程大学 | A kind of gradation design method of the heat regeneration asphalt mixture based on orthogonal design |
| CN113244849A (en) * | 2021-05-31 | 2021-08-13 | 深圳市综合交通设计研究院有限公司 | Cold material bin belt feeder feeding control method and system based on supply and demand balance |
| CN113324848A (en) * | 2021-05-20 | 2021-08-31 | 山东大学 | Low-temperature bending strain test method for asphalt mixture trabecula test piece |
| CN114687266A (en) * | 2022-05-30 | 2022-07-01 | 江苏南通冠仟新材料科技有限公司 | Intelligent turning and mixing method for recycled asphalt concrete based on program control |
| CN115446985A (en) * | 2022-09-05 | 2022-12-09 | 中交三航(南通)海洋工程有限公司 | Adjustable and controllable concrete sand thickness and gradation optimization method |
| CN115495699A (en) * | 2022-10-24 | 2022-12-20 | 中交三航(南通)海洋工程有限公司 | Adjustable and controllable concrete gravel gradation optimization method |
| CN117805351B (en) * | 2024-03-01 | 2024-05-03 | 吉林建筑大学 | Comprehensive evaluation method for fatigue resistance of asphalt mixture |
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| CN103726429A (en) * | 2014-01-26 | 2014-04-16 | 哈尔滨工业大学 | Method for quickly verifying production grading of hot-mixed asphalt concrete |
| CN106468634A (en) * | 2016-09-22 | 2017-03-01 | 广东华路交通科技有限公司 | Improved asphalt immersion Marshall stability test method |
| CN108330779A (en) * | 2018-04-12 | 2018-07-27 | 无锡市万方电子有限公司 | A kind of pitch mixer control system |
| CN108951368A (en) * | 2018-09-05 | 2018-12-07 | 三汽车制造有限公司 | The automatic blending method and automatic batching system and bituminous mixing plant of bituminous mixing plant |
| CN108951368B (en) * | 2018-09-05 | 2020-09-29 | 三一汽车制造有限公司 | Automatic batching method and system for asphalt mixing plant and asphalt mixing plant |
| CN109917115A (en) * | 2019-01-23 | 2019-06-21 | 长安大学 | A kind of asphalt comprehensive performance prediction technique |
| CN110318319A (en) * | 2019-06-04 | 2019-10-11 | 武汉工程大学 | A kind of gradation design method of the heat regeneration asphalt mixture based on orthogonal design |
| CN110318319B (en) * | 2019-06-04 | 2021-11-02 | 武汉工程大学 | Thermal regeneration asphalt mixture grading design method based on orthogonal design |
| CN113324848A (en) * | 2021-05-20 | 2021-08-31 | 山东大学 | Low-temperature bending strain test method for asphalt mixture trabecula test piece |
| CN113324848B (en) * | 2021-05-20 | 2022-07-15 | 山东大学 | Low-temperature bending strain test method for asphalt mixture trabecula test piece |
| CN113244849A (en) * | 2021-05-31 | 2021-08-13 | 深圳市综合交通设计研究院有限公司 | Cold material bin belt feeder feeding control method and system based on supply and demand balance |
| CN113244849B (en) * | 2021-05-31 | 2023-02-17 | 深圳市综合交通设计研究院有限公司 | Cold material bin belt feeder feeding control method and system based on supply and demand balance |
| CN114687266A (en) * | 2022-05-30 | 2022-07-01 | 江苏南通冠仟新材料科技有限公司 | Intelligent turning and mixing method for recycled asphalt concrete based on program control |
| CN115446985A (en) * | 2022-09-05 | 2022-12-09 | 中交三航(南通)海洋工程有限公司 | Adjustable and controllable concrete sand thickness and gradation optimization method |
| CN115495699A (en) * | 2022-10-24 | 2022-12-20 | 中交三航(南通)海洋工程有限公司 | Adjustable and controllable concrete gravel gradation optimization method |
| CN117805351B (en) * | 2024-03-01 | 2024-05-03 | 吉林建筑大学 | Comprehensive evaluation method for fatigue resistance of asphalt mixture |
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Application publication date: 20130828 |