CN117303772A - Method for preparing continuous size-fraction aggregates by using interval size-fraction aggregates - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 28
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- 239000002245 particle Substances 0.000 claims description 24
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- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical compound C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a method for configuring continuous size-fraction aggregates by using interval size-fraction aggregates, which comprises the following steps: setting target continuous size-graded aggregate, and obtaining target continuous size-graded aggregate distribution; selecting interval size fraction aggregates based on the target continuous size fraction aggregate grading distribution; screening the selected interval grain-level aggregates to obtain the screening allowance of each screen pore of the interval grain-level aggregates; and (3) calculating the screening allowance based on each screen mesh of the interval size-fraction aggregate, obtaining the ratio of the assumed consumption of each interval size-fraction aggregate, and completing the allocation of the target continuous size-fraction aggregate according to the ratio of the assumed consumption of each interval size-fraction aggregate. The invention can improve the accuracy and flexibility of aggregate matching.
Description
Technical Field
The invention relates to the technical field of concrete aggregates, in particular to a method for preparing continuous size-graded aggregates by using interval size-graded aggregates.
Background
Building sand is used as the building material with the largest volume, and the demand is bigger throughout the year. In recent years, the source mode of the sand aggregate has changed significantly. Natural sand collected in a river channel is reduced year by year, aggregates processed by mountain stones, tailings and waste stones are more and more, but due to the lower quality level, the particle composition of the aggregates is very unstable, so that qualified products need to be adjusted at any time in the use process. The ready-mixed concrete prepared by the sand stone has large fluctuation of workability and unstable quality after the concrete is hardened, so that the margin coefficient has to be increased to compensate related deficiency during the concrete production, and a lot of waste is caused. At present, sand and stone processing enterprises are few according to the standard processing enterprises of building aggregate, and general main products are processed according to single size fractions. The tailings are processed according to continuous size grades of enterprises taking the tailings as raw materials, but the particle size of the tailings is used for selecting main ores, so that the grading composition of the tailings is very unstable, and great trouble is brought to the use of concrete production enterprises. To enhance the comprehensive application of tailings, tailings material enterprise processing also begins to transition from continuous size fractions to interval size fractions.
From the perspective of aggregate production, the aggregate standard of the section size fraction is researched and compiled, which is beneficial to eliminating the trouble caused by continuous size fraction production of the existing machine-made aggregate production enterprises. According to the requirements of the existing standard, the grading of the aggregate is mostly continuous size, so that in order to meet the standard requirements, an aggregate production enterprise must overcome many difficulties, especially partial rock characteristics determine that the aggregate production enterprise is not suitable for producing continuous size aggregate, which is a great challenge for the aggregate production enterprise, and even if the aggregate production enterprise is capable of producing continuous size aggregate in hundreds of thousands of times, the result is not satisfactory. Therefore, the continuous size fraction of the aggregate is pursued, the normal production of the production enterprises is seriously influenced, the enthusiasm of the production enterprises is weakened, the production efficiency is greatly reduced, and meanwhile, the effective utilization of the aggregate and the tailing waste rock of a popularization and application mechanism is not facilitated.
From the use point of the aggregate, according to the general requirements of concrete preparation, the aggregate with high bulk density is easy to obtain by using the continuous size-grade aggregate, and the consumption of cementing materials is reduced. Therefore, the method for researching and formulating the interval grain-level aggregate to configure the continuous grain-level aggregate is beneficial to improving the flexibility of concrete preparation, meets the actual requirements at present, is an innovative measure for aggregate application development, and has a directional guiding effect. Has important practical significance for improving the performance of the concrete mixture and the overall quality of the concrete.
However, according to the requirements of the present "sand for construction" GB/T14684, the present "pebble for construction, broken stone" GB/T14685 and the present "sand for ordinary concrete, stone quality and inspection method Standard" JGJ 52, only the continuous size fraction of the aggregate is standardized, and the use method of the aggregate of interval size fraction or the aggregate of single size fraction is not explicitly pointed out. Therefore, how to use interval grain aggregates to prepare continuous grain aggregates becomes a key problem for the application of waste rock and tailing aggregates and the improvement of the performance of concrete mixtures.
Disclosure of Invention
The invention aims to provide a method for configuring continuous size-fraction aggregates by using interval size-fraction aggregates, which normalizes the configuration of the continuous size-fraction aggregates and improves the accuracy and flexibility of aggregate matching.
In order to achieve the above object, the present invention provides the following solutions:
a method of configuring continuous size fraction aggregate with interval size fraction aggregate, comprising:
setting target continuous size-graded aggregate, and obtaining target continuous size-graded aggregate distribution;
selecting interval size fraction aggregates based on the target continuous size fraction aggregate grading distribution;
screening the selected interval grain-level aggregate to obtain the screening allowance of each screen pore of the interval grain-level aggregate;
and calculating the screening allowance based on each screen hole of the interval size-fraction aggregate, obtaining the ratio of the assumed consumption of each interval size-fraction aggregate, and completing the configuration of the target continuous size-fraction aggregate according to the ratio of the assumed consumption of each interval size-fraction aggregate.
Further, obtaining the target continuous size fraction aggregate grading distribution comprises:
determining the maximum particle size of the target continuous size-fraction aggregate, and acquiring the passing percentage of the sieve pores based on the maximum particle size;
and obtaining the accumulated screen allowance of each screen hole of the target continuous size-fraction aggregate according to the passing percentage of the screen holes, subtracting the accumulated screen allowance of each screen hole one by one, and obtaining the screen allowance of each screen hole of the target continuous size-fraction aggregate, wherein the screen allowance of each screen hole is the grading distribution of the target continuous size-fraction aggregate.
Further, the calculation method for obtaining the passing percentage of the sieve holes based on the maximum particle size comprises the following steps:
wherein P is the passing percentage of sieve pores; d, maximum aggregate particle size; d-diameter of the sieve holes.
Further, the calculation method for obtaining the accumulated screening quantity of each screen hole of the target continuous size-fraction aggregate according to the screen hole passing percentage comprises the following steps:
S＝1-P (2)
wherein S is the accumulated screening allowance of each screen hole of the target continuous size-grade aggregate.
Further, selecting the interval grain grade aggregate comprises:
and continuously selecting interval size aggregate based on the maximum particle size of the target continuous size aggregate and the maximum interval average particle size, wherein the maximum particle size cumulative screen allowance of the interval size aggregate is not less than 20%.
Further, the obtaining of the ratio of the assumed amounts of the grain-size aggregates in each section includes:
and obtaining the ratio of the assumed usage amount of the section size-grade aggregates based on the screen allowance calculated by each screen pore of the section size-grade aggregates and the screen allowance calculated by each screen pore of the target continuous size-grade aggregates.
Further, the calculation method for obtaining the ratio of the assumed usage of the particle-grade aggregate in each section comprises the following steps:
wherein m is m-m interval grain grade aggregates are selected; a, a ij -dividing and counting the screen residue of the size-fraction aggregate in the j-size section on the i-size screen holes; x is x j -j number interval size fraction aggregate usage; b i -fractional screen surplus of the target continuous size fraction aggregate on the i-mesh.
Further, completing the configuration of the target continuous size-fraction aggregate according to the ratio of the assumed amounts of the size-fraction aggregates in each section comprises:
normalizing the ratio of the assumed usage amount of the section size-fraction aggregate, obtaining the ratio of the section size-fraction aggregate in the target continuous size-fraction aggregate, and completing the configuration of the target continuous size-fraction aggregate based on the ratio of the section size-fraction aggregate in the target continuous size-fraction aggregate.
The beneficial effects of the invention are as follows:
the invention provides a method for preparing continuous size-fraction aggregates by standardizing interval size-fraction aggregates, which comprises the steps of setting target continuous size-fraction aggregates, selecting corresponding interval size-fraction aggregates, screening, calculating the screening allowance of corresponding screen holes of the target aggregates and the ratio of the assumed usage of each interval size-fraction aggregate to obtain the configuration proportion, and setting the stopping condition to 0.001 by using a Jacobi iteration method in the calculation process, so that the interval size-fraction aggregates can be scientifically and accurately configured as the continuous size-fraction aggregates, the accuracy and the flexibility of aggregate matching are improved, and the method has important practical significance for the application of waste rock and tailing aggregates and the improvement of the performance of concrete mixtures.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for configuring continuous size fraction aggregates using interval size fraction aggregates in accordance with an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The embodiment provides a method for configuring continuous size-fraction aggregates by using interval size-fraction aggregates, as shown in fig. 1, including:
s1, setting target continuous size-fraction aggregate grading;
the grading distribution of the target continuous size-fraction aggregate can be based on the closest packing state of the aggregate, and the grading distribution of the target continuous size-fraction aggregate can meet a fullerene formula:
wherein P is the passing percentage of sieve pores; d, maximum aggregate particle size; d-diameter of the sieve holes.
After determining the maximum particle size of the required aggregate, the screen residue of each screen can be calculated:
S＝1-P (2)
in the formula, S is the accumulated screen allowance of each screen hole.
S is the accumulated screening allowance of each screen hole, and adjacent two numbers are subtracted successively to obtain positive number which is the graded screening allowance, namely the target continuous size-graded aggregate grading distribution S]，[S]Representing a set of column vectors, represented by b i Constitution, b i Represents the fractional screen residue of the target continuous size fraction aggregate on the i-mesh.
The method can also set the accumulated screening allowance of the target continuous size-fraction aggregate according to the requirements of the JGJ 52 on the grading of sand and broken stone particles in the standard method for testing the quality of sand and stone for common concrete, further calculate the accumulated screening allowance of the target aggregate to obtain the classified screening allowance, and finally obtain [ S ].
S2, selecting corresponding interval grain grade aggregates;
alternative interval size fraction aggregates are shown in table 1.
TABLE 1
The following conditions should be satisfied when selecting interval size fraction aggregates:
(1) continuously selecting interval grain grade aggregates;
(2) according to the maximum particle diameter D of the target continuous size grade aggregate max To select the maximum interval average particle diameter D a Value of interval-size aggregate D max The accumulated screen allowance should be not less than 20%.
S3, screening the section size grade aggregate selected in the step S2, wherein the sum of the screening allowance calculated by the screening holes and the assumed consumption of the section size aggregate is equal to the screening allowance calculated by the screening holes of the corresponding screening holes of the target aggregate;
and after the section size grade aggregate is selected, screening the selected aggregate to obtain the screening allowance of each screen pore diameter meter. The drawing table is shown in table 2.
TABLE 2
The sum of the multiplication of the calculated screening allowance of each screen hole and the assumed consumption of the aggregate with the particle size of each section is equal to the calculated screening allowance of the corresponding screen hole of the target aggregate:
wherein m is m-m interval grain grade aggregates are selected; a, a ij -dividing and counting the screen residue of the size-fraction aggregate in the j-size section on the i-size screen holes; x is x j -j number interval size fraction aggregate usage; b i -fractional screen surplus of the target continuous size fraction aggregate on the i-mesh.
S4, calculating to obtain the ratio of the assumed amounts of the aggregates of the grain grades in each section, and normalizing the result to obtain the configuration proportion
And calculating to obtain x, namely the ratio of the usage amount of the aggregate of the size fraction in each section, and dividing a certain usage amount by the sum of all the usage amounts, namely normalizing to obtain the ratio of the aggregate of the size fraction in the section in the target aggregate.
The method proposed in this embodiment is verified as follows
(1) The JGJ 52 requirements for sand grading are shown in Table 3 and the target continuous size fraction aggregate grading is determined as shown in Table 4.
TABLE 3 Table 3
TABLE 4 Table 4
| Screen aperture diameter/mm | 0.15 | 0.30 | 0.60 | 1.18 | 2.36 | 4.75 |
| Cumulative sieve residue/% | 96 | 81 | 65 | 45 | 23 | 8 |
| Fractional screen residue/% | 15 | 16 | 20 | 22 | 15 | 8 |
(2) Five interval size fraction aggregates shown in the following Table 5 were continuously selected and the respective fractional screen contents were measured
TABLE 5
| Fractional screen residue/% | 0.15 | 0.3 | 0.6 | 1.18 | 2.36 | 4.75 |
| 0-0.315 | 88 | 8 | 0 | 0 | 0 | 0 |
| 0.315-1.25 | 14 | 53 | 23 | 7 | 0 | 0 |
| 0.63-2.5 | 0 | 9 | 58 | 21 | 6 | 0 |
| 1.25-5 | 0 | 0 | 6 | 62 | 21 | 3 |
| 2.5-10 | 0 | 0 | 0 | 11 | 53 | 27 |
(3) The sum of the multiplication of the calculated screening allowance of each screen hole and the assumed consumption of the aggregate with the particle size of each section is equal to the calculated screening allowance of the corresponding screen hole of the target aggregate, and the consumption of the aggregate with the particle size of the section is respectively x 1 、x 2 、x 3 、x 4 、x 5 The following formula is listed:
88x 1 +14x 2 ＝15
8x 1 +53x 2 +9x 3 ＝16
23x 2 +58x 3 +6x 4 ＝20
7x 2 +21x 3 +62x 4 +11x 5 ＝22
6x 3 +21x 4 +53x 5 ＝15
3x 4 +27x 5 ＝8
(4) The calculation result is obtained: x is x 1 ＝0.1315，x 2 ＝0.2447，x 3 ＝0.2255，x 4 ＝0.2118，x 5 ＝0.1949；
The normalization result is: x is x 1 ＝13.0％，x 2 ＝24.3％，x 3 ＝22.4％，x 4 ＝21.0％，x 5 ＝19.3％。
In the configuration process, according to the strength of the concrete to water cement ratio, the sand ratio is obtained by looking up a table, and further calculatedTo the required fine aggregate mass M, respectively and x 1 、x 2 、x 3 、x 4 、x 5 Multiplying to obtain the use amount of the size fraction aggregate in the interval of 1 to 5. And uniformly mixing the aggregate of the grain grades in each section to obtain the aggregate meeting the target continuous grading. By the method, the interval size-graded aggregate can be scientifically and accurately configured into the continuous size-graded aggregate.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but various modifications and improvements made by those skilled in the art to which the present invention pertains are made without departing from the spirit of the present invention, and all modifications and improvements fall within the scope of the present invention as defined in the appended claims.
Claims (8)
1. A method for configuring continuous size fraction aggregate using interval size fraction aggregate, comprising:
setting target continuous size-graded aggregate, and obtaining target continuous size-graded aggregate distribution;
selecting interval size fraction aggregates based on the target continuous size fraction aggregate grading distribution;
screening the selected interval grain-level aggregate to obtain the screening allowance of each screen pore of the interval grain-level aggregate;
and calculating the screening allowance based on each screen hole of the interval size-fraction aggregate, obtaining the ratio of the assumed consumption of each interval size-fraction aggregate, and completing the configuration of the target continuous size-fraction aggregate according to the ratio of the assumed consumption of each interval size-fraction aggregate.
2. The method of configuring continuous size fraction aggregates with interval size fraction aggregates according to claim 1, wherein obtaining the target continuous size fraction aggregate grading distribution comprises:
determining the maximum particle size of the target continuous size-fraction aggregate, and acquiring the passing percentage of the sieve pores based on the maximum particle size;
and obtaining the accumulated screen allowance of each screen hole of the target continuous size-fraction aggregate according to the passing percentage of the screen holes, subtracting the accumulated screen allowance of each screen hole one by one, and obtaining the screen allowance of each screen hole of the target continuous size-fraction aggregate, wherein the screen allowance of each screen hole is the grading distribution of the target continuous size-fraction aggregate.
3. The method for preparing continuous size fraction aggregates using interval size fraction aggregates according to claim 2, wherein the calculation method for obtaining the passing percentage of sieve pores based on the maximum particle diameter is:
wherein P is the passing percentage of sieve pores; d, maximum aggregate particle size; d-diameter of the sieve holes.
4. The method for preparing continuous size fraction aggregates using interval size fraction aggregates according to claim 3, wherein the calculation method for obtaining the cumulative sieve amount of each sieve opening of the target continuous size fraction aggregates according to the sieve opening passing percentage is:
S＝1-P (2)
wherein S is the accumulated screening allowance of each screen hole of the target continuous size-grade aggregate.
5. The method of configuring continuous size fraction aggregate with interval size fraction aggregate according to claim 1, wherein selecting the interval size fraction aggregate comprises:
and continuously selecting interval size aggregate based on the maximum particle size of the target continuous size aggregate and the maximum interval average particle size, wherein the maximum particle size cumulative screen allowance of the interval size aggregate is not less than 20%.
6. The method of configuring continuous size fraction aggregates with section size fraction aggregates according to claim 1, wherein obtaining the ratio of hypothetical amounts of each section size fraction aggregate comprises:
and obtaining the ratio of the assumed usage amount of the section size-grade aggregates based on the screen allowance calculated by each screen pore of the section size-grade aggregates and the screen allowance calculated by each screen pore of the target continuous size-grade aggregates.
7. The method for preparing continuous size fraction aggregates using section size fraction aggregates according to claim 6, wherein the calculation method for obtaining the ratio of the assumed amounts of each section size fraction aggregate is:
wherein m is m-m interval grain grade aggregates are selected; a, a ij -dividing and counting the screen residue of the size-fraction aggregate in the j-size section on the i-size screen holes; x is x j -j number interval size fraction aggregate usage; b i -fractional screen surplus of the target continuous size fraction aggregate on the i-mesh.
8. The method for configuring continuous size fraction aggregates using section size fraction aggregates according to claim 1, wherein completing the configuration of the target continuous size fraction aggregates according to the ratio of the assumed amounts of the section size fraction aggregates comprises:
normalizing the ratio of the assumed usage amount of the section size-fraction aggregate, obtaining the ratio of the section size-fraction aggregate in the target continuous size-fraction aggregate, and completing the configuration of the target continuous size-fraction aggregate based on the ratio of the section size-fraction aggregate in the target continuous size-fraction aggregate.
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