CN115340328A - Large-mixing-amount anti-permeability iron tailing sand concrete and preparation method thereof - Google Patents
Large-mixing-amount anti-permeability iron tailing sand concrete and preparation method thereof Download PDFInfo
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- CN115340328A CN115340328A CN202210848825.3A CN202210848825A CN115340328A CN 115340328 A CN115340328 A CN 115340328A CN 202210848825 A CN202210848825 A CN 202210848825A CN 115340328 A CN115340328 A CN 115340328A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
- B28C5/006—Methods for mixing involving mechanical aspects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/48—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected by vibrations
- B28C5/485—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected by vibrations with reciprocating or oscillating stirrers; Stirrers therefor
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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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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- Organic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses large-dosage anti-permeability iron tailing sand concrete which comprises cement, silica fume, broken stone, river sand, iron tailing sand, a naphthalene water reducer, polypropylene fiber and water; also provides a preparation method of the large-mixing-amount anti-permeability iron tailing sand concrete, and the iron tailing sand mixed material is screened and cleaned; weighing the combinations in sequence according to the mass; pouring cement, silica fume, broken stone, river sand, iron tailing sand, a naphthalene water reducer and polypropylene fiber into a stirrer in sequence and dry-mixing for 0.5-1.5 min; pouring 60% of water into a stirrer, stirring for 0.5-1.5 min, pouring 40% of water into the stirrer, stirring for 1.5-4 min, and fully and uniformly stirring; adding the final mixture into a mold twice, and tamping with a tamping rod 20-25 times after each addition; and (5) after standing, removing the mold, and putting the mold into a curing room for curing for 28 days under standard conditions. The invention improves the anti-permeability performance and the durability of the tailing concrete by adding materials such as the water reducing agent, the polypropylene fiber and the like.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to high-doping-amount anti-permeability iron tailing sand concrete and a preparation method thereof.
Background
The chemical composition of the iron tailings is similar to that of a plurality of materials in the field of construction, and cement and sandstone aggregate are the building materials with the largest annual consumption in China. The iron tailing sand is proportioned again after being classified and screened, so that the particle composition is good. And elutriating the screened iron tailing sand, and elutriating the sand. The quartz in the iron tailings has stronger hardness, the particle size is close to that of natural sand and machine-made sand, and the performance of mixed sand obtained by mixing the iron tailings sand and the natural sand is superior to that of river sand.
When the impermeability test is carried out on the iron tailing concrete, the following defects exist: 1. although the traditional iron tailing concrete proportioning components are concrete which is often used by people, the impermeability and the durability of the traditional iron tailing concrete proportioning components do not reach the ideal state; 2. when the iron tailing concrete is prepared, a stirrer is required to be adopted to stir the iron tailing concrete, a large amount of residues are easily adsorbed on the inner wall, and the stirring uniformity of the iron tailing concrete can influence the performance of the later stage.
Disclosure of Invention
The invention aims to solve the defect of poor preparation effect of iron tailing concrete in the prior art, and provides anti-permeability iron tailing sand concrete with a large mixing amount.
In order to solve the problems of low impermeability and durability of iron tailing concrete in the prior art, the invention adopts the following technical scheme:
the large-doped anti-permeability iron tailing sand concrete comprises cement, silica fume, broken stone, river sand, iron tailing sand, a naphthalene water reducer, polypropylene fiber and water; wherein the proportion of the cement is 300-350 kg/m 3 The ratio of the silica fume is 30-42 kg/m 3 The proportion of the gravels is 1100-1200 kg/m 3 The river sand accounts for 200-224 kg/m 3 The proportion of the iron tailing sand is 480-508 kg/m 3 The percentage of the naphthalene water reducing agent is 2.0-3.4 kg/m 3 The ratio of the polypropylene fiber is 0.5-1.3 kg/m 3 The ratio of the water is 160-200 kg/m 3 。
Preferably, the proportion of the cement is 324kg/m 3 The ratio of the silica fume is 36kg/m 3 The ratio of the crushed stones is 1150kg/m 3 The river sand accounts for 212kg/m 3 The proportion of the iron tailing sand is 494kg/m 3 The percentage of the naphthalene water reducer is 2.7kg/m 3 The ratio of the polypropylene fiber is 0.9kg/m 3 The ratio of the water is 180kg/m 3 。
Preferably, the cement is ordinary portland cement, the grade is 42.5, and the specific surface area is 360m 3 (iv) kg; the 28-day activity index of the silica fume is 105%, and the chemical component of the silica fume is mainly SiO 2 In which SiO is 2 The content of (D) is 98.4%.
Preferably, the apparent density of the river sand is 2580kg/m 3 Bulk density of 1450kg/m 3 Fineness modulus is 2.5, and grading II area; the apparent density of the iron tailing sand is 2730kg/m 3 Bulk density of 1520kg/m 3 Fineness modulus is 2.4, and grading II area.
Preferably, the mixing amount of the naphthalene water reducer is 0.75 percent of the cementing material; the polypropylene fiber has the diameter of 12.6 mu m, the length of 20mm and the density of 0.91g/cm 3 The tensile strength is 520MPa, and the strength retention rate is 99.2%.
The invention also provides a preparation method of the large-dosage anti-permeability iron tailing sand concrete, which comprises the following steps:
s1, screening and cleaning iron tailing sand mixed material pulled back from a mine field for later use;
s2, mixing 324kg/m of cement 3 36kg/m of silica fume 3 1150kg/m of crushed stone 3 212kg/m river sand 3 494kg/m iron tailings sand 3 Naphthalene series water reducing agent 2.7kg/m 3 0.9kg/m polypropylene fiber 3 180kg/m of water 3 Weighing according to the mass in sequence;
s3, pouring cement, silica fume, broken stone, river sand, iron tailing sand, a naphthalene water reducer and polypropylene fiber into a stirrer in sequence, and dry-mixing for 0.5-1.5 min to form a primary mixture;
s4, pouring 60% of water into a stirrer, stirring the primary mixture and 60% of water for 0.5-1.5 min to form a secondary mixture, pouring 40% of water into the stirrer, stirring the secondary mixture and the remaining 40% of water for 1.5-4 min, and fully and uniformly stirring to form a final mixture;
s5, adding the formed final mixture into a mold twice, and inserting and pounding for 20-25 times by using a pounding stick after each time of adding;
and S6, standing for 24 hours, removing the formwork, and placing the concrete into a curing room to cure for 28 days under standard conditions, so that the preparation of the large-doped impervious iron tailing concrete is completed.
Preferably, the stirrer comprises a bottom plate, a fixing ring is arranged on the top surface of the bottom plate, an inner cylinder is inserted into the fixing ring, an open barrel body is arranged at the top end of the inner cylinder, a side plate is arranged on one side of the top surface of the bottom plate, a transverse plate is arranged at the top of the side plate, a first connecting plate is arranged on the right side of the bottom surface of the transverse plate, a transverse shaft is arranged at the bottom end of the first connecting plate, the left end of the transverse shaft rotatably penetrates through the side plate and extends to the outside, and a limiting disc is arranged at the right end of the transverse shaft;
eccentric one side is equipped with the puddler in the uncovered staving, the lateral surface eccentric position of spacing dish is equipped with the eccentric round pin axle, the right-hand member portion of eccentric round pin axle rotates with the middle part of puddler to be connected, the bottom of puddler extends to the bottom in the uncovered staving, just the bottom of puddler is equipped with the stirring rake, the top portion of puddler is connected with the diaphragm through spacing subassembly.
Preferably, spacing subassembly includes a spacing axle, a rectangular cylinder, the top surface right side of diaphragm is equipped with the second and links the board, the top portion that the second links the board is equipped with the sleeve, be equipped with spacing axle in the sleeve, the well upper portion cover of puddler is equipped with a rectangular cylinder, the right-hand member portion and the rectangular cylinder rigid coupling of spacing axle.
Preferably, the top surface left side of diaphragm is equipped with servo motor, servo motor's motor shaft tip cover is equipped with first belt pulley, the rectangle through-hole has been seted up at the middle part of diaphragm, the inside of rectangle through-hole is equipped with first belt, the middle part cover of cross axle is equipped with the second belt pulley, first belt pulley carries out the transmission through first belt and second belt pulley and is connected.
Compared with the prior art, the invention has the beneficial effects that:
1. in the invention, the proportioning components of the iron tailing sand concrete are redistributed, so that the iron tailing sand mixing amount of the concrete is 50 percent, the impermeability grade can reach 4.0MPa, the permeability height is only 8.388cm, and the requirement of the impermeability concrete is met;
2. in the invention, the preparation method of the iron tailing sand concrete is improved, the stirring paddle is used for uniformly stirring the materials of all components in the open barrel, and the wall scraping operation is synchronously carried out on the inner wall of the open barrel, so that the stirring uniformity during the preparation of the iron tailing sand concrete is further improved;
in conclusion, the invention not only can greatly improve the utilization rate of the solid waste iron tailings, change waste into valuable, relieve the problems of resource shortage of the traditional building materials and occupied area and stockpiling of the tailings, but also improve the impermeability and durability of the tailing concrete by adding materials such as the water reducing agent, the polypropylene fiber and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of the proportioning of each component of the large-doped impervious iron tailing sand concrete of the invention;
FIG. 2 is a schematic diagram of a preparation method of the large-doped anti-permeability iron tailing sand concrete of the invention;
FIG. 3 is a schematic three-dimensional structure of the blender of the present invention;
FIG. 4 is a schematic three-dimensional structure of the blender of the present invention;
FIG. 5 is a schematic three-dimensional structure of the blender of the present invention;
FIG. 6 is a schematic elevational view of the mixer of the present invention;
FIG. 7 is a schematic right-side view of a blender of the present invention;
FIG. 8 is a schematic top view of a blender of the present invention;
FIG. 9 is a longitudinal section splitting diagram of a No. 1 test block of impervious iron tailing concrete;
FIG. 10 is a longitudinal section splitting diagram of 6 test blocks of impervious iron tailing concrete;
number in the figure: the device comprises a bottom plate 1, a fixing ring 11, an inner cylinder 12, an open barrel body 13, a linkage shaft 14, a bevel gear 15, a bevel gear ring 16, a second belt 17, a side plate 2, a transverse plate 21, a first connecting plate 22, a transverse shaft 23, a limiting disc 24, a stirring rod 25, an eccentric pin shaft 26, a stirring paddle 27, a servo motor 3, a first belt 31, a second connecting plate 32, a sleeve 33, a limiting shaft 34 and a rectangular barrel 35.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The first embodiment is as follows: the embodiment provides a large-dosage impervious iron tailing sand concrete, which is shown in figure 1 and specifically comprises cement, silica fume, broken stone, river sand, iron tailing sand, a naphthalene water reducer, polypropylene fiber and water; wherein the proportion of the cement is 300-350 kg/m 3 The ratio of the silica fume is 30-42 kg/m 3 The proportion of the broken stone is 1100-1200kg/m 3 The river sand accounts for 200-224 kg/m 3 The iron tailing sand accounts for 480-508 kg/m 3 The percentage of the naphthalene water reducing agent is 2.0-3.4 kg/m 3 The ratio of the polypropylene fiber is 0.5-1.3 kg/m 3 The proportion of water is 160-200 kg/m 3 。
In the specific implementation process, the optimal proportion of each component is 324kg/m 3 The ratio of silica fume is 36kg/m 3 The proportion of the crushed stones is 1150kg/m 3 The river sand accounts for 212kg/m 3 The ratio of iron tailing sand is 494kg/m 3 The percentage of the naphthalene water reducing agent is 2.7kg/m 3 The ratio of the polypropylene fiber is 0.9kg/m 3 The proportion of water is 180kg/m 3 。
In the specific implementation process, the cement is ordinary portland cement, the grade is 42.5 grade, and the specific surface area is 360m 3 (iv) kg; the 28-day activity index of the silica fume is 105 percent, and the chemical component of the silica fume is mainly SiO 2 In which SiO is 2 The content of (A) is 98.4%; the apparent density of the river sand is 2580kg/m 3 Bulk density of 1450kg/m 3 Fineness modulus is 2.5, and a grading II area; the apparent density of the iron tailing sand is 2730kg/m 3 Bulk density of 1520kg/m 3 Fineness modulus is 2.4, and a grading II area; the mixing amount of the naphthalene water reducer is 0.75 percent of the cementing material; the polypropylene fiber has a diameter of 12.6 μm, a length of 20mm and a density of 0.91g/cm 3 The tensile strength is 520MPa, the strength retention rate is 99.2 percent, the mixing amount of the concrete iron tailing sand is 50 percent, the impermeability grade can reach 4.0MPa, the permeability height is only 8.388cm, and the requirement of the impermeability concrete is met.
The second embodiment: on the basis of the first embodiment, the embodiment also provides a preparation method of the large-doped anti-iron-permeability tailing sand concrete, which is shown in fig. 2 and specifically comprises the following steps:
s1, screening and cleaning iron tailing sand mixed materials pulled back from a mine field, and grading for later use;
s2, mixing 324kg/m of cement 3 36kg/m of silica fume 3 1150kg/m of crushed stone 3 212kg/m river sand 3 494kg/m iron tailings sand 3 Naphthalene series water reducing agent 2.7kg/m 3 0.9kg/m of polypropylene fiber 3 180kg/m of water 3 Weighing according to the mass in sequence;
s3, pouring cement, silica fume, broken stone, river sand, iron tailing sand, a naphthalene water reducer and polypropylene fiber into a stirrer in sequence, and dry-mixing for 0.5-1.5 min to form a primary mixture;
s4, pouring 60% of water into a stirrer, stirring the primary mixture and the 60% of water for 0.5-1.5 min to form a secondary mixture, pouring 40% of water into the stirrer, stirring the secondary mixture and the residual 40% of water for 1.5-4 min, and fully and uniformly stirring to form a final mixture;
s5, adding the formed final mixture into a mold twice, and inserting and pounding the mixture for 20 to 25 times by using a pounding stick after each time of adding;
and S6, standing for 24 hours, then removing the mold, and putting the mold into a curing room to cure for 28 days under standard conditions to finish the preparation of the large-doped anti-permeability iron tailing concrete.
Example three: in the second embodiment, there is a problem of uneven mixing during concrete preparation, and therefore, on the basis of the second embodiment, referring to fig. 3 to 8, specifically, the second embodiment further includes:
the stirrer comprises a bottom plate 1, wherein a fixing ring 11 is arranged on the top surface of the bottom plate 1, an inner cylinder 12 which is rotatably connected is inserted in the fixing ring 11, a hemispherical open barrel body 13 is arranged at the top end part of the inner cylinder 12, a side plate 2 which is vertically fixedly connected is arranged on one side of the top surface of the bottom plate 1, a transverse plate 21 which is transversely fixedly connected is arranged on the top part of the side plate 2, a first connecting plate 22 which is vertically fixedly connected is arranged on the right side of the bottom surface of the transverse plate 21, a transverse shaft 23 which transversely penetrates through and is rotatably connected is arranged at the bottom end part of the first connecting plate 22, the left end part of the transverse shaft 23 rotatably penetrates through the side plate 2 and extends to the outside, and a limiting disc 24 which is concentrically fixedly connected is arranged at the right end part of the transverse shaft 23;
eccentric one side is equipped with vertical puddler 25 of placing in the uncovered staving 13, the lateral surface eccentric position of spacing dish 24 is equipped with eccentric pin axle 26, the right-hand member portion of eccentric pin axle 26 rotates with the middle part of puddler 25 to be connected, the bottom of puddler 25 extends to the bottom in the uncovered staving 13, and the bottom of puddler 25 is equipped with stirring rake 27, the top portion of puddler 25 is connected with diaphragm 21 through spacing subassembly, when spacing dish 24 rotates, it carries out eccentric rotation to drive eccentric pin axle 26, the bottom and the stirring rake 27 of synchronous drive puddler 25 carry out reciprocating motion in uncovered staving 13, and can carry out even stirring operation to each subassembly material in the uncovered staving 13 through stirring rake 27.
In the specific implementation process, as shown in fig. 3 and 4, the limiting component comprises a limiting shaft 34 and a rectangular cylinder 35, a second connecting plate 32 which is fixedly connected vertically is arranged on the right side of the top surface of the transverse plate 21, a sleeve 33 which is fixedly connected transversely is arranged at the top end part of the second connecting plate 32, the limiting shaft 34 which is connected in a rotating manner is arranged in the sleeve 33, the rectangular cylinder 35 which is connected in a sliding manner is sleeved on the middle upper part of the stirring rod 25, and the right end part of the limiting shaft 34 is fixedly connected with the rectangular cylinder 35; when the middle part of the stirring rod 25 swings back and forth, the middle upper part of the stirring rod 25 slides back and forth along the rectangular cylinder 35, and drives the limit shaft 34 to rotate along the sleeve 33.
In the concrete implementation process, as shown in fig. 3 and 5, the top surface left side of diaphragm 21 is equipped with the servo motor 3 of horizontal placing, the motor shaft tip cover of servo motor 3 is equipped with the first belt pulley of concentric rigid coupling, the rectangle through-hole has been seted up at the middle part of diaphragm 21, the inside of rectangle through-hole is equipped with the first belt 31 of vertical placing, the middle part cover of cross axle 23 is equipped with the second belt pulley of concentric rigid coupling, first belt pulley carries out the transmission through first belt 31 and second belt pulley and is connected, servo motor 3's motor shaft drives first belt pulley synchronous rotation, first belt pulley drives the second belt pulley through first belt 31, cross axle 23, the third belt pulley, spacing dish 24 carries out synchronous rotation.
Example four: in the third embodiment, there is a problem that the open tub 13 is inconvenient to rotate, and therefore, on the basis of the third embodiment, as shown in fig. 4 and 5, in particular, the present embodiment further includes:
it should be noted that: in the embodiment, a third belt pulley which is concentrically and fixedly connected is sleeved at the left end part of the transverse shaft 23, a linkage shaft 14 which transversely penetrates through and is rotatably connected is arranged at the middle lower part of the side plate 2, a fourth belt pulley which is concentrically and fixedly connected is sleeved at the left end part of the linkage shaft 14, the third belt pulley is in transmission connection with the fourth belt pulley through a second belt 17, and the third belt pulley drives the fourth belt pulley, the linkage shaft 14 and the bevel gear 15 to synchronously rotate through the second belt 17; the right end of the cross shaft 23 is sleeved with a bevel gear 15 which is concentrically and fixedly connected, the middle upper part of the inner cylinder 12 is sleeved with a bevel gear ring 16 which is concentrically and fixedly connected, the bevel gear 15 is meshed with the bevel gear ring 16, and the bevel gear 15 is meshed to drive the bevel gear ring 16, the inner cylinder 12 and the open barrel body 13 to slowly rotate.
Example five: in the third embodiment, there is a problem that the principle of the stirrer is not clear, and therefore, on the basis of the third embodiment, the working principle and the operation method of the stirrer are specifically as follows:
step one, a servo motor 3 is started, a motor shaft of the servo motor 3 drives a first belt pulley to synchronously rotate, and the first belt pulley drives a second belt pulley, a transverse shaft 23, a third belt pulley and a limiting disc 24 to synchronously rotate through a first belt 31;
step two, the third belt pulley drives the fourth belt pulley, the universal driving shaft 14 and the bevel gear 15 to synchronously rotate through the second belt 17, and as the number of teeth of the bevel gear 15 is far smaller than that of the bevel gear ring 16, the bevel gear 15 meshes with the bevel gear ring 16, and drives the bevel gear ring 16, the inner cylinder 12 and the open barrel body 13 to slowly rotate;
step three, when the limiting disc 24 rotates, the eccentric pin shaft 26 is driven to eccentrically rotate, the eccentric pin shaft 26 and the stirring rod 25 form limiting, the middle part of the stirring rod 25 is driven to reciprocate, the middle upper part of the stirring rod 25 reciprocates along the rectangular cylinder 35, the limiting shaft 34 is driven to rotate along the sleeve 33, the bottom of the stirring rod 25 and the stirring paddle 27 are synchronously driven to reciprocate in the open barrel body 13, and the stirring rod 25 is vertically and eccentrically arranged on one side in the open barrel body 13, so that wall scraping operation can be carried out on the inner wall of the open barrel body 13 through the stirring paddle 27;
pouring cement, silica fume, broken stone, river sand, iron tailing sand, a naphthalene water reducer and polypropylene fiber into the open barrel body 13 in sequence, and performing dry stirring for 0.5-1.5 min to form a primary mixture;
pouring 60% of water into the open barrel body 13, stirring the primary mixture and the 60% of water for 0.5-1.5 min to form a secondary mixture, pouring 40% of water into the open barrel body 13, stirring the secondary mixture and the remaining 40% of water for 1.5-4 min, and fully and uniformly stirring to form a final mixture.
Example six: the impervious iron tailing sand concrete is proportioned and combined according to the optimal proportion in the first embodiment, and is prepared according to the steps in the second embodiment, the impervious iron tailing sand concrete is uniformly stirred by a stirrer and then enters a mold, the mold is stood and solidified into blocks, the solidified and molded concrete is cut into a plurality of pairs of test blocks by a concrete cutting machine, and the section views of the plurality of pairs of test blocks are shown in fig. 9 and fig. 10, so that the longitudinal section splitting schematic diagrams of the plurality of pairs of test blocks are obtained.
The invention not only can greatly improve the utilization rate of the solid waste iron tailings, change waste into valuable, relieve the problems of resource shortage of the traditional building materials and occupied area stockpiling of the tailings, but also improve the impermeability and durability of the tailing concrete by adding materials such as the water reducing agent, the polypropylene fiber and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The large-mixing-amount anti-permeability iron tailing sand concrete is characterized in that: comprises cement, silica fume, broken stone, river sand, iron tailing sand, a naphthalene water reducer, polypropylene fiber and water; wherein the proportion of the cement is 300-350 kg/m 3 The ratio of the silica fume is 30-42 kg/m 3 The proportion of the gravels is 1100-1200 kg/m 3 The river sand accounts for 200-224 kg/m 3 The proportion of the iron tailing sand is 480-508 kg/m 3 The percentage of the naphthalene water reducing agent is 2.0-3.4 kg/m 3 The ratio of the polypropylene fiber is 0.5-1.3 kg/m 3 The ratio of the water is 160-200 kg/m 3 。
2. The large-doped impervious iron tailing sand concrete as claimed in claim 1, which is characterized in that: the proportion of the cement is 324kg/m 3 The ratio of the silica fume is 36kg/m 3 The ratio of the crushed stones is 1150kg/m 3 The river sand accounts for 212kg/m 3 The proportion of the iron tailing sand is 494kg/m 3 The percentage of the naphthalene water reducer is 2.7kg/m 3 The ratio of the polypropylene fiber is 0.9kg/m 3 The proportion of the water is 180kg/m 3 。
3. The large-doped impervious iron tailing sand concrete as claimed in claim 2, which is characterized in that: the cement is ordinary portland cement with the grade of 42.5 and the specific surface area of 360m 3 Per kg; the 28-day activity index of the silica fume is 105%, and the chemical component of the silica fume is mainly SiO 2 In which SiO is 2 The content of (A) was 98.4%.
4. The large-doped impervious iron tailing sand concrete as claimed in claim 2, which is characterized in that: the apparent density of the river sand is 2580kg/m 3 Bulk density of 1450kg/m 3 Fineness modulus is 2.5, and a grading II area; the apparent density of the iron tailing sand is 2730kg/m 3 Bulk density of 1520kg/m 3 Fineness modulus is 2.4, and grading II area.
5. The large-dosage anti-permeability iron tailing sand concrete as claimed in claim 2, which is characterized in that: the mixing amount of the naphthalene water reducer is 0.75 percent of that of the cementing material; the polypropylene fiber has the diameter of 12.6 mu m, the length of 20mm and the density of 0.91g/cm 3 The tensile strength is 520MPa, and the strength retention rate is 99.2%.
6. The preparation method of the large-doped impervious iron tailing sand concrete as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps of:
s1, screening and cleaning iron tailing sand mixed material pulled back from a mine field for later use;
s2, mixing 324kg/m of cement 3 36kg/m of silica fume 3 1150kg/m of crushed stone 3 212kg/m river sand 3 494kg/m iron tailings sand 3 Naphthalene series water reducing agent 2.7kg/m 3 0.9kg/m of polypropylene fiber 3 180kg/m of water 3 Weighing according to the mass in turn;
s3, pouring cement, silica fume, broken stone, river sand, iron tailing sand, a naphthalene water reducer and polypropylene fiber into a stirrer in sequence, and dry-mixing for 0.5-1.5 min to form a primary mixture;
s4, pouring 60% of water into a stirrer, stirring the primary mixture and 60% of water for 0.5-1.5 min to form a secondary mixture, pouring 40% of water into the stirrer, stirring the secondary mixture and the remaining 40% of water for 1.5-4 min, and fully and uniformly stirring to form a final mixture;
s5, adding the formed final mixture into a mold twice, and inserting and pounding the mixture for 20 to 25 times by using a pounding stick after each time of adding;
and S6, standing for 24 hours, then removing the mold, and putting the mold into a curing room to cure for 28 days under standard conditions to finish the preparation of the large-doped anti-permeability iron tailing concrete.
7. The preparation method of the large-doped impervious iron tailing sand concrete as claimed in claim 6, wherein the preparation method comprises the following steps: the stirring machine comprises a bottom plate (1), a fixing ring (11) is arranged on the top surface of the bottom plate (1), an inner cylinder (12) is inserted into the fixing ring (11), an open barrel body (13) is arranged at the top end of the inner cylinder (12), a side plate (2) is arranged on one side of the top surface of the bottom plate (1), a transverse plate (21) is arranged at the top of the side plate (2), a first connecting plate (22) is arranged on the right side of the bottom surface of the transverse plate (21), a transverse shaft (23) is arranged at the bottom end of the first connecting plate (22), the left end of the transverse shaft (23) rotatably penetrates through the side plate (2) and extends to the outside, and a limiting disc (24) is arranged at the right end of the transverse shaft (23);
eccentric one side is equipped with puddler (25) in uncovered staving (13), the lateral surface eccentric position of spacing dish (24) is equipped with eccentric round pin axle (26), the right-hand member portion of eccentric round pin axle (26) rotates with the middle part of puddler (25) to be connected, the bottom of puddler (25) extends to bottom in uncovered staving (13), just the bottom of puddler (25) is equipped with stirring rake (27), the top portion of puddler (25) is connected with diaphragm (21) through spacing subassembly.
8. The preparation method of the large-dosage anti-permeability iron tailing sand concrete as claimed in claim 7, characterized in that: spacing subassembly includes spacing axle (34), a rectangular cylinder (35), the top surface right side of diaphragm (21) is equipped with the second and links board (32), the top portion that the second links board (32) is equipped with sleeve (33), be equipped with spacing axle (34) in sleeve (33), the well upper portion cover of puddler (25) is equipped with a rectangular cylinder (35), the right-hand member portion and the rectangular cylinder (35) rigid coupling of spacing axle (34).
9. The preparation method of the large-dosage anti-permeability iron tailing sand concrete as claimed in claim 7, characterized in that: the top surface left side of diaphragm (21) is equipped with servo motor (3), the motor shaft tip cover of servo motor (3) is equipped with first belt pulley, the rectangle through-hole has been seted up at the middle part of diaphragm (21), the inside of rectangle through-hole is equipped with first belt (31), the middle part cover of cross axle (23) is equipped with the second belt pulley, first belt pulley carries out the transmission through first belt (31) and second belt pulley and is connected.
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