CN115400853B - Machine-made sand modularized production process for prestressed concrete structure based on coarse aggregate shaping - Google Patents
Machine-made sand modularized production process for prestressed concrete structure based on coarse aggregate shaping Download PDFInfo
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- CN115400853B CN115400853B CN202110575086.0A CN202110575086A CN115400853B CN 115400853 B CN115400853 B CN 115400853B CN 202110575086 A CN202110575086 A CN 202110575086A CN 115400853 B CN115400853 B CN 115400853B
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- 239000004576 sand Substances 0.000 title claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 58
- 238000007493 shaping process Methods 0.000 title claims abstract description 47
- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 26
- 239000004575 stone Substances 0.000 claims abstract description 74
- 239000000843 powder Substances 0.000 claims abstract description 56
- 239000002994 raw material Substances 0.000 claims abstract description 25
- 238000012216 screening Methods 0.000 claims abstract description 24
- 239000000428 dust Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 23
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 11
- 239000011707 mineral Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 239000010865 sewage Substances 0.000 claims description 4
- 239000011800 void material 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
- 239000000203 mixture Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 abstract description 12
- 238000005336 cracking Methods 0.000 abstract description 2
- -1 automatic screening Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 abstract 1
- 239000010419 fine particle Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 26
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007780 powder milling Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001412 amines Chemical class 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
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000000265 homogenisation 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
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- 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 modularized production process for a prestressed concrete structure based on coarse aggregate shaping, which takes coarse aggregate as a raw material, enters a coarse aggregate shaping module for shaping after surface impurity removal, and screens out coarse aggregate finished products by screening equipment; fine particles generated by shaping enter a machine-made sand production module, and the machine-made sand for the prestressed concrete structure, which is round in particle shape, reasonable in grading, and proper in stone powder content, is prepared by utilizing the technologies of mutual friction of particles, automatic screening, stone powder control and the like; the stone powder is collected by dust removing equipment in the production process, and the stone powder mineral admixture is prepared after superfine treatment. The modularized production process realizes multidimensional integrated functions such as gravel shaping, homogeneous machine-made sand preparation, stone powder ultrafining and the like, is suitable for real-time production of machine-made sand in a prestress structure factory, solves the problem that prestress concrete generates uneven stress due to different sand-stone-powder lithology, and reduces the risks of shrinkage cracking and creep arching of the prestress concrete structure.
Description
Technical Field
The invention belongs to the technical field of aggregate processing, and particularly relates to a machine-made sand modularized production process for a prestressed concrete structure based on coarse aggregate shaping.
Background
The coarse aggregate component occupies a large amount in the concrete, and the performance quality of the coarse aggregate component is closely related to the performance of the concrete. The coarse aggregate with poor quality is generally sharp in particle shape, high in needle-shaped content and discontinuous in particle grading, and influences the construction performance and service performance of railway engineering concrete, especially high-strength grade concrete with C50 and above for prestressed structures. Compared with the definition of the needle-shaped and sheet-shaped particles in the Chinese standard, the requirements of the needle-shaped and sheet-shaped particles in the European standard are severe, namely the needle-shaped and sheet-shaped particles are defined in the European standard, and the needle-shaped and sheet-shaped particles possibly are not needle-shaped and sheet-shaped particles in the Chinese standard, so that the aggregate particle shape of China is poor. 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 with a round shape, large surface friction and continuous grain composition, thereby improving the performance of the railway engineering concrete. However, 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 grain size distribution is poor, the undersize is not suitable for being directly applied to railway engineering cement concrete, a large amount of resources are wasted when the undersize is simply used as roadbed filler, and the undersize generated after the coarse aggregate shaping process has a great utilization space. Compared with high-quality machine-made sand produced by adopting mine rock stones, tunnel slag, pebble gravel and other parent rocks, the high-quality machine-made sand for the prestressed concrete structure is prepared by further crushing, shaping and screening undersize materials, so 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 railway engineering prestress structure requires high compressive strength, small shrinkage and good durability, and the machine-made sand in the current market is uneven in quality, and the machine-made sand production lacks standard and systematic management and control measures, so that the quality of components can be deteriorated when the machine-made sand is used in the railway engineering prestress structure, and therefore the use of the machine-made sand is strictly limited in the relevant standards of the prestress structures such as railway engineering beams, pillows, track slabs and the like. The stone scraps produced by shaping coarse aggregate are used for further preparing high-quality machine-made sand and superfine stone powder mineral admixture finished products for the prestressed concrete structure, so that uniform sources of stone, sand and powder applied to the prestressed structure of railway engineering and identical chemical quality can be ensured, and the homogenization of sand, stone and powder has remarkable effect on guaranteeing the quality of the machine-made sand prestressed concrete member.
Chinese patent CN201910485981.6 discloses a high-quality machine-made sand production process, which adopts limestone with the size of 2-20mm as a raw material, and circularly sorts the limestone in a mill for multiple times after processing, but the requirement of the raw material for processing in the patent is limestone with the size of 2-20mm, so that the source of master batch is greatly limited, the processing program is complex, and the improvement of production efficiency is not facilitated. Chinese patent CN201811026945.5 discloses a production process of high quality machine-made sand, mainly setting a grain shape optimizing machine behind the vibrating screen, finely controlling the grading of the machine-made sand by using a screening device set in the grain shape optimizing machine, the patent does not indicate the mesh size of the fine screening, and the difficulty of implementing the fine screening process in the production process is large. The Chinese patent CN201810324043. X discloses a method for improving shaping efficiency of machine-made sand based on shaping additives, which reduces particle agglomeration, improves material fluidity and improves screening efficiency by adding substances such as amine polar molecules, alcohol polar molecules, water reducing agent and the like in the production process of the machine-made sand, thereby improving material crushing and shaping efficiency of the machine-made sand, but the shaping agents are not beneficial to low production cost control of the machine-made sand. Chinese patent CN201320476163.8 discloses a stone shaping system with an on-line dust collector, which recycles stone dust in the stone shaping system by a negative pressure bag dust collector, but only solves the recycling problem of stone dust. At present, a production process capable of conveniently and efficiently producing high-quality machine-made sand for railway engineering prestress structures is lacking.
Disclosure of Invention
Aiming at the problems that the quality control of machine-made sand for a railway engineering prestress structure is difficult, stone scraps byproducts are wasted after shaping coarse aggregate and the like, the invention provides a machine-made sand modular production process for the prestress structure based on the shaping of the coarse aggregate.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a machine-made sand modularized 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, enters a coarse aggregate shaping module for shaping after surface impurity removal, and screens out shaped coarse aggregate finished products by screening equipment; the undersize produced by shaping enters a machine-made sand production module to prepare the machine-made sand for the prestressed concrete structure, which has round grain shape, reasonable grading and proper stone powder content; the stone powder produced in the production process is collected by dust removal equipment, and the stone powder mineral admixture is prepared after superfine treatment;
the maximum grain diameter of the coarse aggregate raw material is 31.5mm-40mm, the raw material is cleaned, subjected to impurity removal, placed still and stored, and the sewage treatment after cleaning adopts a water circulation system, so that the water content of the raw material is not more than 3% during production;
the production modules are divided into a coarse aggregate shaping module, a machine-made sand preparation module and a stone powder superfine module, and the three production modules are uniformly arranged in a prestressed concrete structure production factory and are close to a raw material storage area in the prestressed concrete structure factory;
the coarse aggregate shaping module of the production 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 type 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 installation 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 shaped coarse aggregate finished product is in three single particle grades of 5-10mm, 10-16mm and 16-25mm, and the mass ratio of the coarse aggregate finished product is (20% -40%): (35% -45%): (20% -40%), the total content of needle and flaky particles of each size fraction 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 machine-made sand preparation module of the production module consists of a sand making machine, a screening machine and a bucket elevator, wherein 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 composition of a linear vibrating screen, a circular vibrating screen and a high-frequency vibrating screen, the installation 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 3-5mm; the finished product of the machine-made sand for the prestressed concrete structure is 0-3mm and 3-5mm, and the mass ratio of the machine-made sand to the finished product is (75% -90%): when the total mass of the finished product of the machine-made sand is lower than that of the finished product of the sand stone (35% -40%), 5-10mm broken stone is additionally used as a raw material to produce the machine-made sand, the circularity of the finished product of the machine-made sand with the grain size of 3-5mm is not less than 0.85, the stone powder content of the finished product of the machine-made sand with the grain size of no more than 1.60,0-3mm is not more than 5%, the finished product of the sand stone is proportionally designed into 0-25mm full-graded aggregate with the tight void ratio of less than 40%, and the fineness modulus of 0.015-4.75 mm particles is 2.6-3.2;
the stone powder ultra-fine module of the production module consists of a stone powder recovery submodule and a stone powder grinding submodule, wherein the stone powder recovery submodule consists of a fan, a dust remover, a dust removing air pipe and an exhaust hood, the dust removing air pipe is arranged in the coarse aggregate shaping module and the machine-made sand production module, the total dust removing efficiency of the dust remover is not less than 95%, and the stone powder grinding submodule consists of one or more grinding machines; the specific surface area of the stone powder mineral admixture after ultra-refinement is not less than 500m 2 The water content is not more than 1 percent per kg.
According to the machine-made sand modularized production process for the prestressed concrete structure based on coarse aggregate shaping, the total yield is not less than 90%, the finished products with various grain diameters are stored in different bins, the height of a material pile is not more than 5m, and the stone powder mineral admixture is stored by adopting a metal tank body.
The beneficial effects of the invention are as follows:
(1) The production process is integrated: the coarse aggregate shaping, the machine-made sand preparation, the stone powder ultrafining and the railway engineering prestressed concrete structure production are jointly arranged, long-distance transportation can be avoided after the production of the fine-grain coarse aggregate, the high-quality machine-made sand and the ultrafine stone powder mineral admixture, the fine-grain coarse aggregate, the high-quality machine-made sand and the ultrafine stone powder mineral admixture are directly used as raw materials for the railway engineering prestressed concrete structure production, the problems that the raw materials are polluted in the transportation process, the quality fluctuation is large and the like are prevented, and after the production process is integrated, the raw materials can be timely supplied only by preparing sufficient crushed stone raw materials, and the production delay and the construction period delay are prevented.
(2) And (3) modularization of a production system: the coarse aggregate shaping, the machine-made sand production and the stone powder superfine are respectively independent production modules and are mutually related, the modularized arrangement is beneficial to reducing the occupied area and fully utilizing the field, and the modularized arrangement is beneficial to equipment maintenance and service.
(3) Homogenizing raw materials: the coarse aggregate, the machine-made sand and the stone powder admixture produced by the process are all derived 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 that the precast concrete is subjected to uneven stress due to different sand-stone-powder lithology is solved, and the occurrence risks of phenomena such as shrinkage cracking, creep and arching of the concrete are reduced.
(4) And (3) designing and refining the concrete mixing ratio: the coarse aggregate, the machine-made sand and the stone powder admixture produced by the process are various in particle size, and can be prepared into a skeleton with continuous grading and low compact void ratio through proportional design, so that the prestressed concrete with high strength, good compactness and small deformation is prepared.
Drawings
For a clearer description of an embodiment of the present invention, the drawings that are required to be used in the description of the embodiment will be briefly described, it being apparent that the drawings described below are only one embodiment of the present invention, and that other drawings may be obtained 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 scheme of the invention is further specifically described below through examples and 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) The method is characterized in that 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 circulating water is adopted in the sewage treatment system.
(2) After the raw materials are kept stand for 2-3 hours, the water content of the raw materials is controlled to be lower than 3 percent, the raw materials are sent into a coarse aggregate shaping module, the coarse aggregate is firstly crushed and shaped in a reaction crusher, and the coarse aggregate enters a vertical shaft type impact crusher for crushing and shaping after the particle size is reduced, so that a coarse aggregate finished product with a particle shape and a round shape and large surface friction is formed.
(3) After the shaped coarse aggregate is screened by a circular vibrating screen combined screen surface, crushed stone with the diameter of more than 25mm continuously returns to the coarse aggregate shaping module, crushed stone with the diameter of not more than 25mm is screened into three-grade coarse aggregate finished products with the diameters of 5-10mm, 10-16mm and 16-25mm and undersize scraps with the diameters of 0-5mm by screening equipment, the coarse aggregate finished products are conveyed to a finished product warehouse by a belt for storage, and undersize products are continuously processed in the next step.
(4) Relevant parameters of a coarse aggregate shaping system and screening equipment are regulated, and the mass ratio of the coarse aggregate finished products of three single-particle grades of 5-10mm, 10-16mm and 16-25mm is 25 percent: 30%:45%.
(5) The undersize material enters a machine-made sand production module which consists of two vertical shaft type impact crushers, and after the undersize material is shaped by the vertical shaft type impact crushers, the undersize material is screened into finished products of machine-made sand with the mass ratio of 0-3mm and 3-5mm by screening equipment, wherein the mass ratio is 85 percent: 15, conveying the finished product to a finished product bin for storage by a belt, and continuously returning undersize products larger than 5mm to a sand making system for sand making shaping.
(6) When the proportion of finished machine-made sand is low, the proportion of finished machine-made sand is improved by adopting a method of adding broken stone with the diameter of 5-10mm, when the proportion of finished machine-made sand is high, the shaping time of coarse aggregate is reduced so as to reduce the amount of undersize materials entering a machine-made sand production module, and the proportion of finished machine-made sand is controlled to be about 38% of the total mass of sand stone.
(7) The dust removing air pipe is arranged in the coarse aggregate shaping module and the machine-made sand production module, stone powder generated in the processing process is collected in the dust remover, the stone powder is further processed by the stone powder ultra-fine module to obtain ultra-fine stone powder, the stone powder ultra-fine module consists of a stone powder recycling sub-module and a stone powder milling sub-module, the stone powder recycling sub-module consists of a fan, the dust remover, the dust removing air pipe and an exhaust hood, the total dust removing efficiency of the dust remover is 99%, the stone powder milling sub-module is a pulverizer, and the collected stone powder is subjected to ultra-fine treatment in a pulverizing mode to obtain the stone powder mineral admixture.
(8) The total production efficiency of the process is 95%, the needle and flake contents of the produced coarse aggregate finished product are 1%, the circularity is 0.87, the length-diameter ratio is 1.43, the mud content is 0.2%, 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, and the stone powder content of the finished product of the 3-5mm size fraction machine-made sand with the length-diameter ratio not more than 1.46,0 mm is 3%; stone powder after superfine treatment with specific surface area of 550m 2 The water content per kg was 0.4%.
(9) When the prestressed concrete structure is produced, the railway engineering prestressed structure is prepared by directly taking fine coarse aggregate, high-quality machine-made sand and 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 sand stone aggregate is designed into 0-25mm full-graded aggregate, the compact void ratio is 36%, the fineness modulus of 0.015-4.75 mm particles is 2.7, and the stone powder mixing amount is 10% of the total amount of cementing materials.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments 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, based on the present disclosure, should make improvements and modifications within the scope of the present invention.
Claims (2)
1. A machine-made sand modularized 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, enters a coarse aggregate shaping module for shaping after surface impurity removal, and screens out shaped coarse aggregate finished products by screening equipment; the undersize produced by shaping enters a machine-made sand production module to prepare the machine-made sand for the prestressed concrete structure, which has round grain shape, reasonable grading and proper stone powder content; the stone powder produced in the production process is collected by dust removal equipment, and the stone powder mineral admixture is prepared after superfine treatment;
the maximum grain diameter of the coarse aggregate raw material is 31.5mm-40mm, the raw material is cleaned, subjected to impurity removal, placed still and stored, and the sewage treatment after cleaning adopts a water circulation system, so that the water content of the raw material is not more than 3% during production;
the production modules are divided into a coarse aggregate shaping module, a machine-made sand preparation module and a stone powder superfine module, and the three production modules are uniformly arranged in a prestressed concrete structure production factory and are close to a raw material storage area in the prestressed concrete structure factory;
the coarse aggregate shaping module of the production 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 type 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 installation 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 shaped coarse aggregate finished product is in three single particle grades of 5-10mm, 10-16mm and 16-25mm, and the mass ratio of the coarse aggregate finished product is (20% -40%): (35% -45%): (20% -40%), the total content of needle and flaky particles of each size fraction 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 machine-made sand preparation module of the production module consists of a sand making machine, a screening machine and a bucket elevator, wherein 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 composition of a linear vibrating screen, a circular vibrating screen and a high-frequency vibrating screen, the installation 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 3-5mm; the finished product of the machine-made sand for the prestressed concrete structure is 0-3mm and 3-5mm, and the mass ratio of the machine-made sand to the finished product is (75% -90%): when the total mass of the finished product of the machine-made sand is lower than that of the finished product of the sand stone (35% -40%), 5-10mm broken stone is additionally used as a raw material to produce the machine-made sand, the circularity of the finished product of the machine-made sand with the grain size of 3-5mm is not less than 0.85, the stone powder content of the finished product of the machine-made sand with the grain size of no more than 1.60,0-3mm is not more than 5%, the finished product of the sand stone is proportionally designed into 0-25mm full-graded aggregate with the tight void ratio of less than 40%, and the fineness modulus of 0.015-4.75 mm particles is 2.6-3.2;
the stone powder ultra-fine module of the production module consists of a stone powder recovery submodule and a stone powder grinding submodule, wherein the stone powder recovery submodule consists of a fan, a dust remover, a dust removing air pipe and an exhaust hood, the dust removing air pipe is arranged in the coarse aggregate shaping module and the machine-made sand production module, the total dust removing efficiency of the dust remover is not less than 95%, and the stone powder grinding submodule consists of one or more grinding machines; the specific surface area of the stone powder mineral admixture after ultra-refinement is not less than 500m 2 The water content is not more than 1 percent per kg.
2. The machine-made sand modularized production process for the prestressed concrete structure based on coarse aggregate shaping, which is characterized in that the total yield is not less than 90%, finished products with various grain sizes are stored in different bins, the height of a material pile is not more than 5m, and stone powder mineral admixture is stored by adopting a metal tank body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110575086.0A CN115400853B (en) | 2021-05-26 | 2021-05-26 | Machine-made sand modularized production process for prestressed concrete structure based on coarse aggregate shaping |
Applications Claiming Priority (1)
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