CN115400853A - Machine-made sand modular production process for prestressed concrete structure based on coarse aggregate shaping - Google Patents
Machine-made sand modular production process for prestressed concrete structure based on coarse aggregate shaping Download PDFInfo
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- CN115400853A CN115400853A CN202110575086.0A CN202110575086A CN115400853A CN 115400853 A CN115400853 A CN 115400853A CN 202110575086 A CN202110575086 A CN 202110575086A CN 115400853 A CN115400853 A CN 115400853A
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- 239000004576 sand Substances 0.000 title claims abstract description 93
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 61
- 238000007493 shaping process Methods 0.000 title claims abstract description 49
- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 33
- 239000004575 stone Substances 0.000 claims abstract description 59
- 239000000843 powder Substances 0.000 claims abstract description 43
- 239000002245 particle Substances 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 239000000428 dust Substances 0.000 claims abstract description 28
- 238000012216 screening Methods 0.000 claims abstract description 19
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 11
- 239000011707 mineral Substances 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000004567 concrete Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 4
- 239000010865 sewage Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 2
- 238000007873 sieving Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract 1
- 239000010419 fine particle Substances 0.000 abstract 1
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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- 238000013461 design Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
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- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
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- 230000002776 aggregation Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000011010 flushing procedure Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Food Science & Technology (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Disintegrating Or Milling (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a machine-made sand modular production process for a prestressed concrete structure based on coarse aggregate shaping, which takes coarse aggregates as raw materials, removes impurities on the surfaces of the raw materials, enters a coarse aggregate shaping module for shaping, and sieves out a coarse aggregate finished product by a sieving device; the fine particles generated by shaping enter a machine-made sand production module, and machine-made sand for the prestressed concrete structure, which has a round particle shape, reasonable gradation and proper stone powder content, is prepared by utilizing the technologies of mutual particle friction, automatic screening, stone powder control and the like; in the production process, the stone powder is collected by dust removal equipment and is subjected to ultra-fine treatment to prepare the stone powder mineral admixture. The modular production process realizes multidimensional integrated functions of broken stone shaping, homogeneous machine-made sand preparation, stone powder ultra-fining and the like, is suitable for the in-plant made sand real-time production of the prestressed structure, solves the problem of non-uniform stress generated by different sand-stone-powder properties of prestressed concrete, and reduces the risk of shrinkage cracking and creep upwarp of the prestressed concrete structure.
Description
Technical Field
The invention belongs to the technical field of aggregate processing, and particularly relates to a machine-made sand modular production process for a prestressed concrete structure based on coarse aggregate shaping.
Background
The coarse aggregate component accounts for a large proportion in the concrete, and the performance quality of the coarse aggregate component is closely related to the performance of the concrete. Coarse aggregate with poor quality is generally sharp in particle shape, high in needle sheet content and discontinuous in particle grading, and influences the construction performance and service performance of railway engineering concrete, particularly high-strength grade concrete with C50 or above for a prestressed structure. Compared with the definition of the needle and the flaky particles in the Chinese standard, the European standard has more strict requirements on the needle and the flaky particles, namely the European standard defines the needle and the flaky particles, and the European standard may not be the needle and the flaky particles, so that the aggregate particles in China are not in good shape. The method for solving the problem of poor quality of the coarse aggregate is to introduce an aggregate shaping process to produce the coarse aggregate which is in a shape of a perfect circle, large in surface friction and continuous in grain composition, and further improve the performance of the railway engineering concrete. However, the coarse aggregate shaping can generate a large amount of undersize, the edges and corners of the undersize are sharp, the powder content is high, the particle grading is poor, the undersize is not suitable for being directly applied to cement concrete for railway engineering, the undersize is simply used as roadbed filling, a large amount of resources are wasted, and the undersize generated after the coarse aggregate shaping process has a great utilization space. The undersize materials are further crushed, shaped and screened to prepare the high-quality machine-made sand for the prestressed concrete structure, and compared with the high-quality machine-made sand produced by mother rocks such as mine lump stones, tunnel hole slag, pebble gravel and the like, the high-quality machine-made sand has the advantages that resources are fully utilized, a large number of process procedures are omitted, the production efficiency of the high-quality machine-made sand is improved, and the quality source of the machine-made sand is effectively controlled.
The prestressed structure of the railway engineering requires high compressive strength, small shrinkage and good durability of concrete, and because the quality of the machine-made sand in the current market is uneven and the machine-made sand production lacks standard and systematic control measures, the quality of the member may be deteriorated by using the machine-made sand in the prestressed structure of the railway engineering, so that the use of the machine-made sand is strictly limited in relevant standards of prestressed structures such as beams, sleepers, track plates and the like of the railway engineering. The finished product of the high-quality machine-made sand and superfine stone powder mineral admixture for the prestressed concrete structure is further prepared by adopting stone chips generated by shaping coarse aggregates, so that uniform sources and same chemical qualities of stone, sand and powder applied to a prestressed structure of railway engineering can be ensured, and the homogenization of sand-stone-powder has a remarkable effect on ensuring the quality of a machine-made sand prestressed concrete member.
Chinese patent CN201910485981.6 discloses a high-quality machine-made sand production process, limestone with the thickness of 2-20mm is adopted as a raw material, and the high-quality machine-made sand is prepared by multiple times of circular sorting after processing in a grinding machine, but the processing raw material in the process requires limestone with the thickness of 2-20mm, so that the source of master batch is greatly limited, the processing program is complex to set, and the improvement of the production efficiency is not facilitated. Chinese patent CN201811026945.5 discloses a production process of high quality machine-made sand, which mainly sets a grain shape optimizing machine behind a vibrating screen, and utilizes a screening device set in the grain shape optimizing machine to finely control the machine-made sand grading to prepare high quality machine-made sand. Chinese patent CN201810324643.X discloses a method for improving shaping efficiency of machine-made sand based on a shaping additive, and substances such as amine polar molecules, alcohol polar molecules and a water reducing agent are added in the production process of the machine-made sand, so that particle aggregation is reduced, material fluidity is improved, and screening efficiency is improved, and accordingly material crushing and machine-made sand shaping efficiency are improved. Chinese patent CN201320476163.8 discloses a gravel shaping system with an online dust removal device, and this patent recycles the stone dust in the gravel shaping system through a negative pressure bag-type dust remover, but this patent only solves the problem of stone dust recycling. At present, a production process capable of producing high-quality machine-made sand for the railway engineering prestressed structure conveniently and efficiently is also lacked.
Disclosure of Invention
The invention aims at the problems of difficult quality control of machine-made sand for a railway engineering prestressed structure, waste of stone chip byproduct resources after shaping of coarse aggregate and the like, and provides a machine-made sand modular production process for the prestressed structure based on the shaping of the coarse aggregate, which can fully utilize broken stone resources to produce coarse aggregate with excellent particle shape, high-quality machine-made sand for a prestressed concrete structure and ultrafine stone powder mineral admixture, thereby ensuring the uniformity and the quality of stone, sand and powder used in the railway engineering prestressed structure and further improving the quality of the railway engineering prestressed structure.
In order to achieve the purpose, the invention adopts the following technical scheme:
a machine-made sand modular production process for a prestressed concrete structure based on coarse aggregate shaping is characterized by comprising the following steps of: the process takes coarse aggregate as a raw material, removes impurities on the surface of the raw material, enters a coarse aggregate shaping module for shaping, and sieves out a shaped coarse aggregate finished product by using screening equipment; the undersize products generated by shaping enter a machine-made sand production module to prepare machine-made sand for the prestressed concrete structure, which has round and smooth particle shape, reasonable gradation and proper stone powder content; the stone powder produced in the production process is collected by dust removal equipment and is subjected to ultra-fine treatment to prepare the stone powder mineral admixture.
The machine-made sand modular production process for the prestressed concrete structure based on coarse aggregate shaping is characterized in that the maximum particle size of a coarse aggregate raw material is 31.5-40 mm, the raw material is cleaned, subjected to impurity removal, kept stand and stored, a water circulation system is adopted for sewage treatment after cleaning, and the water content of the raw material is not more than 3% during production.
According to the machine-made sand modular production process for the prestressed concrete structure based on coarse aggregate shaping, the production module is divided into a coarse aggregate shaping module, a machine-made sand preparation module and a stone powder ultra-fining module, and the three production modules are uniformly arranged in a prestressed concrete structure production factory and close to a raw material storage area in the prestressed concrete structure factory.
The production module is characterized in that the coarse aggregate shaping module consists of a crusher, a screening machine and a belt conveyor, wherein the crusher is one or more of a cone crusher, an impact crusher and a vertical shaft impact crusher, the screening machine is one or more of a linear vibrating screen, a circular vibrating screen and a high-frequency vibrating screen, the mounting inclination angle of the screening machine is 38-45 degrees, the shape of a screen hole is a round hole or a square hole, and the size of the screen hole is 5-30mm.
The coarse aggregate shaping module is characterized in that the shaped coarse aggregate finished product is of three single particle grades of 5-10mm, 10-16mm and 16-25mm, and the mass ratio of the three single particle grades is (20% -40%): (35-45%): (20% -40%), the total content of needle and flaky particles of each grade is not more than 3%, the circularity is not less than 0.85, the length-diameter ratio is not more than 1.55, the mud content is not more than 0.5%, and the mud block content is 0.
The production module is characterized in that the machine-made sand preparation module consists of a sand making machine, a screening machine and a bucket elevator, the sand making machine consists of one or more than one vertical shaft type impact crusher, the screening machine is one or more than one combination of a linear vibrating screen, a circular vibrating screen and a high-frequency vibrating screen, the mounting inclination angle of the screening machine is 38-45 degrees, the shape of a screen hole is a circular hole or a square hole, and the size of the screen hole is 3-5mm.
The machine-made sand preparation module is characterized in that the finished machine-made sand for the prestressed concrete structure has two types of particle sizes of 0-3mm and 3-5mm, and the mass ratio of the finished machine-made sand to the finished machine-made sand is (75% -90%): (10% -25%), when the total mass of the finished machine-made sand is lower than that of the finished sandstone (35% -40%), 5-10mm of broken stones are additionally used as raw materials to produce the machine-made sand, the circularity of the finished machine-made sand of 3-5mm size fraction is not less than 0.85, the stone powder content of the finished machine-made sand of 1.60,0-3mm size fraction is not more than 5%, when the finished sandstone is used for preparing the prestressed structure concrete, the whole-grade aggregate of 0-25mm is designed according to the proportion, the compact void ratio is less than 40%, and the fineness modulus of the particles of 0.015mm-4.75mm is 2.6-3.2.
The production module is characterized in that the stone powder ultra-refining module consists of a stone powder recovery submodule and a stone powder grinding submodule, the stone powder recovery submodule consists of a fan, a dust remover, a dust removal air pipe and an exhaust hood, the dust removal air pipe is installed in the coarse aggregate shaping module and the machine-made sand production module, the total dust removal efficiency of the dust remover is not less than 95%, and the stone powder grinding submodule consists of one or more than one grinding machine.
The stone powder ultra-fining module is characterized in that the specific surface area of the ultra-fined stone powder mineral admixture is not less than 500m < 2 >/kg, and the water content is not more than 1%.
According to the machine-made sand modular production process for the prestressed concrete structure based on coarse aggregate shaping, the machine-made sand modular production process is characterized in that the assembly yield is not less than 90%, finished products with various particle sizes are stored in bins, the material pile height is not more than 5m, and stone powder mineral admixture is stored by adopting a metal tank body.
The invention has the beneficial effects that:
(1) The production process is integrated: the coarse aggregate shaping, the machine-made sand preparation, the stone powder ultra-fining and the railway engineering prestressed concrete structure production are jointly arranged, long-distance transportation can be avoided after the coarse aggregate with excellent particle shape, the high-quality machine-made sand and the ultra-fine stone powder mineral admixture are produced, the raw materials are directly used as the raw materials for the railway engineering prestressed concrete structure production, the problems that the raw materials are polluted in the transfer process, the quality fluctuation is large and the like are solved, and after the production process is integrated, the raw materials can be guaranteed to be supplied in time only by preparing sufficient crushed stone raw materials, so that the production delay and the construction period delay are prevented.
(2) The production system is modularized: coarse aggregate shaping, machine-made sand production and stone powder ultra-fining are respectively independent production modules and are mutually associated, modular arrangement is favorable for reducing occupied land and fully utilizing fields, and modular arrangement is favorable for equipment maintenance.
(3) Homogenization of raw materials: the coarse aggregate, the machine-made sand and the stone powder admixture produced by the process all come from the same parent metal, the product quality meets the technical requirements of railway concrete on the coarse aggregate, the fine aggregate and the stone powder admixture, the problem of non-uniform stress generated by different sand-stone-powder properties of the precast concrete is solved, and the risks of shrinkage cracking, creep upwarp and other phenomena of the concrete are reduced.
(4) The concrete mix proportion design is refined: the coarse aggregate, the machine-made sand and the stone powder admixture produced by the process have various particle sizes, and can be prepared into a skeleton with continuous gradation and low compact porosity through proportion design, so that the prestressed concrete with high strength, good compactness and small deformation is prepared.
Drawings
In order to illustrate the embodiments of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings described below are only one embodiment of the invention, and that other drawings may be derived from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an exemplary view of the arrangement of the present invention in a prestressed concrete structure production plant.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples with reference to the accompanying drawings.
Referring to fig. 1, the invention relates to a machine-made sand modular production process for a railway engineering prestressed concrete structure based on coarse aggregate shaping, which mainly comprises the following implementation steps:
(1) Coarse aggregate with the maximum particle size of 40mm is used as a production raw material, cleaning equipment is used for removing impurities on the surface of the raw material, flushing water flows into a sewage treatment system through an iron grid on the ground, and the sewage treatment system adopts circulating water.
(2) After the cleaned raw material is kept stand for 2-3h, the water content of the raw material is controlled to be lower than 3%, the raw material is sent to a coarse aggregate shaping module, the coarse aggregate is firstly crushed and shaped in a reaction crusher, and the crushed and shaped raw material enters a vertical shaft type impact crusher after the particle size is reduced to form a coarse aggregate finished product with a muddy round particle shape and large surface friction.
(3) After the shaped coarse aggregate is screened by the combined screen surface of the circular vibrating screen, crushed stones larger than 25mm continue to return to the coarse aggregate shaping module, the crushed stones not larger than 25mm are screened into three-grade coarse aggregate finished products of 5-10mm, 10-16mm and 16-25mm and undersize scraps of 0-5mm by screening equipment, the coarse aggregate finished products are conveyed to a finished product bin by a belt for storage, and the undersize scraps continue to be processed in the next step.
(4) Regulating and controlling relevant parameters of a coarse aggregate shaping system and screening equipment, and controlling the mass ratio of three types of single-particle-grade coarse aggregate finished products of 5-10mm, 10-16mm and 16-25mm to be 25%:30%:45 percent.
(5) The undersize material enters a machine-made sand production module, the machine-made sand production module consists of two vertical shaft type impact crushers, the undersize material is shaped by the vertical shaft type impact crushers and then is sieved into finished machine-made sand products with the particle size of 0-3mm and 3-5mm by sieving equipment, and the mass ratio of the finished machine-made sand products is 85%:15 percent, conveying the finished product to a finished product bin by a belt for storage, and continuously returning the undersize products larger than 5mm to a sand making system for sand making and shaping.
(6) When the proportion of the finished machine-made sand is low, the proportion of the finished machine-made sand is improved by adding 5-10mm of broken stones, when the proportion of the finished machine-made sand is high, the coarse aggregate shaping time is shortened to reduce the amount of undersize entering a machine-made sand production module, and the proportion of the finished machine-made sand is controlled to be about 38% of the total mass of the sandstone.
(7) The dedusting air pipe is arranged in both the coarse aggregate shaping module and the machine-made sand production module, the mountain flour generated in the processing process is collected in the dust remover and is further processed by the mountain flour ultra-fining module to prepare ultra-fine mountain flour, the mountain flour ultra-fining module consists of a mountain flour recovery submodule and a mountain flour fine grinding submodule, the mountain flour recovery submodule consists of a fan, a dust remover, a dedusting air pipe and an exhaust hood, the total dust dedusting efficiency of the dust remover is 99%, the mountain flour fine grinding submodule is a flour mill, and the collected mountain flour is subjected to ultra-fining treatment by adopting a grinding mode to prepare the Dan Fenzhi mineral admixture.
(8) The total production efficiency of the process is 95 percent, the needle and flake contents of the produced coarse aggregate finished product are 1 percent, and the circularity is 0.87, the length-diameter ratio is 1.43, the mud content is 0.2 percent, and the mud block content is 0; the circularity of the finished product of the 3-5mm size fraction machine-made sand is 0.86, the length-diameter ratio is not more than 1.46,0-3mm, and the stone powder content of the finished product of the 3-5mm size fraction machine-made sand is 3%; the specific surface area of the ultrafine treated stone powder is 550m 2 Water content of 0.4% per kg.
(9) When the prestressed concrete structure is produced, the railway engineering prestressed structure is prepared by directly taking the coarse aggregate with excellent grain shape, the high-quality machine-made sand and the superfine stone powder from the coarse aggregate storage area, the fine aggregate storage area and the superfine stone powder storage area according to the concrete mixing proportion, the sandstone aggregate is designed into 0-25mm full-grade aggregate, the compact void ratio is 36 percent, the fineness modulus of 0.015mm-4.75mm particles is 2.7, and the mixing amount of the stone powder is 10 percent of the total amount of the cementing material.
The embodiments described above are intended to enable those skilled in the art to understand and apply the invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (10)
1. A machine-made sand modular production process for a prestressed concrete structure based on coarse aggregate shaping is characterized by comprising the following steps of: the process takes coarse aggregate as a raw material, removes impurities on the surface of the raw material, enters a coarse aggregate shaping module for shaping, and sieves out a shaped coarse aggregate finished product by using screening equipment; the undersize products generated by shaping enter a machine-made sand production module to prepare machine-made sand for the prestressed concrete structure, which has round and smooth particle shape, reasonable gradation and proper stone powder content; the stone powder produced in the production process is collected by dust removing equipment and is subjected to ultra-fine treatment to prepare the stone powder mineral admixture.
2. The machine-made sand modular production process for the prestressed concrete structure based on coarse aggregate shaping as claimed in claim 1, wherein the maximum particle size of the coarse aggregate raw material is 31.5mm-40mm, the raw material is cleaned, decontaminated, then left for storage, a water circulation system is adopted for sewage treatment after cleaning, and the water content of the raw material is not more than 3% during production.
3. The machine-made sand modular production process for the prestressed concrete structure based on coarse aggregate shaping as claimed in claim 1, wherein the production modules are divided into a coarse aggregate shaping module, a machine-made sand preparation module and a stone powder ultra-fining module, and all three production modules are uniformly arranged inside a prestressed concrete structure production factory and are close to a raw material storage area inside the prestressed concrete structure factory.
4. The production module according to claim 3, wherein the coarse aggregate shaping module is composed of a crusher, a screening machine and a belt conveyor, the crusher is one or more of a cone crusher, an impact crusher and a vertical shaft impact crusher, the screening machine is one or more of a linear vibrating screen, a circular vibrating screen and a high-frequency vibrating screen, the mounting inclination angle of the screening machine is 38-45 degrees, the screen holes are circular holes or square holes, and the size of the screen holes is 5-30mm.
5. The coarse aggregate reshaping module according to claim 4, wherein the finished coarse aggregate after reshaping is in the three single particle fractions of 5-10mm, 10-16mm and 16-25mm, and the mass ratio of the three single particle fractions is (20% -40%): (35% -45%): (20% -40%), the total content of needle and flaky particles of each grade is not more than 3%, the circularity is not less than 0.85, the length-diameter ratio is not more than 1.55, the mud content is not more than 0.5%, and the mud block content is 0.
6. The production module according to claim 3, wherein the machine-made sand preparation module comprises a sand making machine, a screening machine and a bucket elevator, the sand making machine comprises one or more than one vertical shaft type impact crusher, the screening machine is one or more than one combination of a linear vibrating screen, a circular vibrating screen and a high-frequency vibrating screen, the mounting inclination angle of the screening machine is 38-45 degrees, the shape of the screen hole is a round hole or a square hole, and the size of the screen hole is 3-5mm.
7. The machine-made sand preparation module of claim 6, wherein the machine-made sand finished product for the prestressed concrete structure has two types of particle sizes of 0-3mm and 3-5mm, and the mass ratio of the machine-made sand finished product to the machine-made sand finished product is (75% -90%): (10% -25%), when the total mass of the finished machine-made sand is lower than that of the finished sandstone (35% -40%), 5-10mm of broken stones are additionally used as raw materials to produce the machine-made sand, the circularity of the finished machine-made sand of 3-5mm size fraction is not less than 0.85, the stone powder content of the finished machine-made sand of 1.60,0-3mm size fraction is not more than 5%, when the finished sandstone is used for preparing the prestressed structure concrete, the whole-grade aggregate of 0-25mm is designed according to the proportion, the compact void ratio is less than 40%, and the fineness modulus of the particles of 0.015mm-4.75mm is 2.6-3.2.
8. The production module of claim 3, wherein the stone dust ultra-refining module comprises a stone dust recovery sub-module and a stone dust ultra-refining sub-module, the stone dust recovery sub-module comprises a fan, a dust remover, a dust removal air duct and an exhaust hood, the dust removal air duct is installed in both the coarse aggregate shaping module and the machine-made sand production module, the total dust removal efficiency of the dust remover is not less than 95%, and the stone dust ultra-refining sub-module comprises one or more than one pulverizer.
9. The stone dust ultrafining module of claim 8, wherein the stone dust mineral admixture after ultrafining has a specific surface area of not less than 500m 2 /kg, water content not more than 1%.
10. The machine-made sand modular production process for the prestressed concrete structure based on coarse aggregate shaping as claimed in claim 1, wherein the assembly yield is not less than 90%, the finished products with various particle sizes are stored in bins, the pile height is not more than 5m, and the stone powder mineral admixture is stored by adopting a metal tank.
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