CN111116075A - Aggregate surface strengthening method and equipment - Google Patents
Aggregate surface strengthening method and equipment Download PDFInfo
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- CN111116075A CN111116075A CN202010009278.0A CN202010009278A CN111116075A CN 111116075 A CN111116075 A CN 111116075A CN 202010009278 A CN202010009278 A CN 202010009278A CN 111116075 A CN111116075 A CN 111116075A
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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
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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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- Environmental & Geological Engineering (AREA)
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- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention provides a method and equipment for reinforcing the surface of aggregate, belonging to the technical field of aggregate reinforcement. The invention provides an aggregate surface strengthening method, which comprises the following steps: and the aggregate is subjected to shaping treatment, wetting treatment and first screening treatment in sequence, then is mixed with aluminate cement paste, and then is subjected to second screening treatment, third screening treatment and maintenance treatment in sequence. According to the invention, the aggregate is wrapped by the aluminate cement paste (the mass ratio of aluminate cement to water to polycarboxylic acid water reducing agent to hydroxypropyl methyl cellulose is 1: 0.20-0.6: 0.002-0.20: 0.002-0.004) with a specific composition, so that the strength of the aggregate is improved; and the second screening treatment and the third screening treatment and maintenance are controlled, so that the surface reinforcement of the macroporous (more than or equal to 0.1mm) and porous (the void ratio is more than or equal to 30%) aggregate is realized. Is suitable for large-scale production.
Description
Technical Field
The invention relates to the technical field of aggregate strengthening, in particular to a method and equipment for strengthening the surface of aggregate.
Background
At present, the method for strengthening treatment of aggregate mainly comprises the following steps: physical strengthening methods and chemical strengthening methods. Among them, the chemical strengthening method has attracted much attention for its good strengthening effect on aggregates. The chemical strengthening method mainly comprises a pure cement slurry strengthening method, a cement slurry externally-doped silicon powder strengthening method, an organic silicon emulsion strengthening method, a polyvinyl alcohol solution strengthening method and the like, however, the aggregate strengthening technology mainly aims at surface strengthening of aggregates with few pores and small gaps, such as concrete aggregates, clay baked brick aggregates and the like, and is not suitable for strengthening porous and macroporous aggregates.
Disclosure of Invention
In view of the above, the present invention provides a method and apparatus for reinforcing the surface of aggregate. The aggregate surface strengthening method provided by the invention can realize the surface strengthening of macroporous and porous aggregates.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a surface strengthening method of aggregate, which comprises the following steps:
shaping aggregate to obtain shaped coarse aggregate; the porosity of the aggregate is more than or equal to 30 percent, and the pore diameter is more than or equal to 0.1 mm;
wetting the shaping coarse aggregate to obtain a wetted aggregate;
carrying out first screening treatment on the wetted aggregate to obtain single-particle-diameter wetted aggregate;
mixing the single-particle-size wet aggregate with aluminate cement paste, performing second screening treatment, performing third screening treatment on the oversize part of the second screening, and then performing maintenance treatment on the undersize part of the third screening;
the aluminate cement paste comprises aluminate cement, water, a polycarboxylic acid water reducing agent and hydroxypropyl methyl cellulose; the mass ratio of the aluminate cement to the water to the polycarboxylic acid water reducing agent to the hydroxypropyl methyl cellulose is 1: 0.20-0.6: 0.002-0.20: 0.002-0.004.
Preferably, the polycarboxylic acid water reducing agent is provided in the form of a polycarboxylic acid solution, and the solid content of the polycarboxylic acid solution is 20-42%.
Preferably, the aggregate comprises one or more of autoclaved aerated concrete blocks, pumice, scoria, ceramsite, expanded slag beads and expanded perlite.
Preferably, the shaping treatment method comprises one or more of a grinding method, a self-impact-friction method and an impact method;
the size of the single-particle-size aggregate is 4-40 mm;
the size of a sieve hole of the sieve used in the second sieving treatment is 1-3 mm smaller than that of the single-particle-diameter aggregate; and the size of the sieve mesh of the sieve used for the third screening treatment is 1-3 mm larger than that of the single-particle-diameter aggregate.
Preferably, the moisture content of the wet aggregate is 5-40%.
Preferably, the curing comprises sequentially performing hot air curing and natural curing.
The temperature of hot air for hot air curing is 30-50 ℃;
the humidity of the natural curing is 40-80%, the temperature is 10-40 ℃, and the time is 1-7 days.
The invention provides equipment used in the method of the technical scheme, which comprises an aggregate shaping part 1, a conveyor belt 2, a wetting part 3, a first vibrating screen 4, a mixed discharging part 5, a cement paste recycling part 6, a hopper 7 and a maintenance tower 8 which are connected in sequence;
the cement slurry recovery part 6 is provided with a second vibrating screen 6-1; the second vibrating screen 6-1 has an inclined angle towards the maintenance tower 8;
the maintenance tower 8 is also internally provided with a buffer plate 8-2, a discharge pipe 8-3, a hot air pipe 8-4, an exhaust fan 8-5 and a hot air recovery pipe 8-6;
the buffer plate 8-2, the discharge pipe 8-3, the conveyor belt 9 and the storage bin 10 are sequentially connected;
the hot air pipe 8-4 is arranged at the bottom end of the maintenance tower 8, two ports of the hot air recovery pipe 8-6 are respectively connected with the top end and the bottom of the maintenance tower 8, and the exhaust fan 8-5 is arranged in the hot air recovery pipe 8-6.
Preferably, the mixing and discharging part 5 is also provided with an aggregate batching hopper 5-1, an additive and water conveying pipe 5-2, a stirrer 5-3 and a discharging hopper 5-4; the inlet of the discharging hopper 5-4 is communicated with the outlet of the stirrer 5-3;
the cement slurry recovery part 6 is also provided with a slurry collecting hopper 6-2, a cement slurry pump 6-3 and a cement slurry recovery pipe 6-4, and the upper port of the slurry collecting hopper 6-2 is used for receiving undersize partial slurry of the second vibrating screen 6-1; the lower port of the slurry collecting hopper 6-2, the cement slurry pump 6-3, the cement slurry recycling pipe 6-4 and the stirrer 5-3 are sequentially connected.
Preferably, the apparatus further comprises a conveyor belt 9 and a storage bin 10;
a buffer plate 8-2 and a discharge pipe 8-3 are also arranged in the maintenance tower 8;
the buffer plate 8-2, the discharge pipe 8-3, the conveyor belt 9 and the storage bin 10 are connected in sequence.
Preferably, the inclination angle of the second vibrating screen 6-1 to the curing tower 8 is 3-26 degrees;
the fall of the second vibrating screen 6-1 and the lower port of the hopper 7 is 5-30 cm;
the third vibrating screen 8-1 is horizontally arranged.
The invention provides a surface strengthening method of aggregate, which comprises the following steps: shaping aggregate to obtain shaped coarse aggregate, wherein the porosity of the aggregate is more than or equal to 30%, and the pore diameter is more than or equal to 0.1 mm; wetting the shaping coarse aggregate to obtain a wetted aggregate; carrying out first screening treatment on the wetted aggregate, wherein the lower part of a screen is single-particle-diameter wetted aggregate, the porosity of the aggregate is more than or equal to 30%, and the pore diameter is more than or equal to 0.1 mm; mixing the single-particle-size wet aggregate with aluminate cement paste, performing second screening treatment, performing third screening treatment on the oversize part of the second screening, and then performing maintenance treatment on the undersize part of the third screening; the aluminate cement paste comprises aluminate cement, water, a polycarboxylic acid water reducing agent and hydroxypropyl methyl cellulose; the mass ratio of the aluminate cement to the water to the polycarboxylic acid water reducing agent to the hydroxypropyl methyl cellulose is 1: 0.20-0.6: 0.002-0.20: 0.002-0.004. According to the surface strengthening method provided by the invention, the aggregate is sequentially shaped, wetted and screened, so that the bonding interface between the aggregate and aluminate cement paste can be improved, the pores of the coated cement paste are reduced, internal maintenance is provided for the hydration of the aluminate cement paste with low water-cement ratio, then the wetted aggregate is coated by the aluminate cement paste with specific composition, and then screening and maintenance are carried out, so that the surface strengthening of the macroporous and porous aggregate is realized. As shown in the results of the embodiment of the invention, the cylinder pressure strength of the autoclaved aerated concrete block lightweight aggregate obtained by the surface strengthening method provided by the invention is improved by 2-7 MPa.
Drawings
FIG. 1 is a view of an apparatus for reinforcing the surface of an aggregate, wherein 1 is an aggregate shaping part; 2 is a conveyor belt; 3 is a moistening part; 4 is a first vibrating screen; 5 is a mixing and discharging part, 5-1 is an aggregate batching hopper, 5-2 is an additive and a water conveying pipe, 5-3 is a stirring machine, and 5-4 is a discharging hopper; 6 is a cement paste recovery part, 6-1 is a vibrating screen, 6-2 is a slurry collecting hopper, 6-3 is a cement slurry pump, and 6-4 is a cement paste recovery pipe; 7 is a hopper; 8 is a maintenance tower, 8-1 is a third vibrating screen, 8-2 is a buffer plate, 8-3 is a discharge pipe, 8-4 is hot air, 8-5 is an exhaust fan, and 8-6 is a hot air recovery pipe; 9 is a conveyor belt; and 10 is a storage bin.
Detailed Description
The invention provides a surface strengthening method of aggregate, which comprises the following steps:
shaping aggregate to obtain shaped coarse aggregate; the porosity of the aggregate is more than or equal to 30 percent, and the pore diameter is more than or equal to 0.1 mm;
wetting the shaping coarse aggregate to obtain a wetted aggregate;
carrying out first screening treatment on the wetted aggregate, and wetting the aggregate with a single particle size;
mixing the single-particle-size wet aggregate with aluminate cement paste, performing second screening treatment, performing third screening treatment on the oversize part of the second screening, and then performing maintenance treatment on the undersize part of the third screening;
the aluminate cement paste comprises aluminate cement, water, a polycarboxylic acid water reducing agent and hydroxypropyl methyl cellulose; the mass ratio of the aluminate cement to the water to the polycarboxylic acid water reducing agent to the hydroxypropyl methyl cellulose is 1: 0.20-0.6: 0.002-0.20: 0.002-0.004.
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
The method comprises the steps of shaping aggregate to obtain shaped coarse aggregate; the porosity of the aggregate is more than or equal to 30 percent, and the pore diameter is more than or equal to 0.1 mm.
In the invention, the porosity of the aggregate is preferably 15 to 90%, more preferably 20 to 70%, and most preferably 30 to 60%.
In the invention, the aggregate preferably comprises one or more of autoclaved aerated concrete blocks, pumice, scoria, ceramsite, expanded slag beads and expanded perlite. The source of the aggregate is not particularly limited, and porous aggregates well known in the field can be adopted, wherein the autoclaved aerated concrete block is preferably derived from building waste.
In the present invention, the shaping treatment method preferably includes one or more of a grinding method, a self-impact-friction method, and an impact method. The concrete operation of the grinding method, the self-impact-friction method and the impact method is not particularly limited, and the aggregate can be shaped by adopting the operation mode of the grinding method, the self-impact-friction method or the impact method which is well known in the field. In the present invention, the shape of the shaped coarse aggregate obtained after the shaping treatment preferably includes a circular shape or an oval shape.
After the shaping coarse aggregate is obtained, the shaping coarse aggregate is subjected to wetting treatment to obtain the wetting aggregate.
In the invention, the wetting treatment mode is preferably to mix the macroporous and porous aggregates with water by stirring or spray the macroporous and porous aggregates with water mist. The stirring and mixing speed in the present invention is not particularly limited, and a stirring speed well known in the art may be used. The specific operation of the spraying is not particularly limited in the present invention, and the spraying operation known in the art may be adopted. In the invention, the moisture content of the wet aggregate is preferably 5-40%, more preferably 10-35%, and most preferably 15-30%. The wetting treatment can improve the bonding interface between the aggregate and the aluminate cement paste, reduce air holes wrapping the cement paste, provide internal curing for the hydration of the aluminate cement paste with low water-cement ratio and further improve the strength of the aggregate.
After the wet aggregate is obtained, the wet aggregate is subjected to first screening treatment, and the single particle diameter wet aggregate.
In the present invention, the size of the screen used in the first screening treatment is preferably 4 to 40mm, more preferably 5 to 30mm, and most preferably 5 to 20 mm. The present invention is not particularly limited to the specific operation of the first screening treatment, and a screening operation known in the art may be used.
After single-particle-diameter wet aggregate is obtained, mixing the single-particle-diameter wet aggregate with aluminate cement paste, performing second screening treatment, performing third screening treatment on the oversize part of the second screening, and then performing maintenance treatment on the undersize part of the third screening; the aluminate cement paste comprises aluminate cement, water, a polycarboxylic acid water reducing agent and hydroxypropyl methyl cellulose; the mass ratio of the aluminate cement to the water to the polycarboxylic acid water reducing agent to the hydroxypropyl methyl cellulose is 1: 0.2-0.6: 0.002-0.20: 0.002-0.004.
In the invention, the type of the aluminate cement is preferably CA50, CA70 or CA80, the fineness of the aluminate cement is preferably 0.080mm, and the screen residue is less than or equal to 10 percent.
In the invention, the polycarboxylic acid water reducing agent is provided in the form of a polycarboxylic acid solution, and the solid content of the polycarboxylic acid solution is preferably 20-42%, more preferably 25-40%, and most preferably 30-35%.
In the invention, the hydroxypropyl methyl cellulose has the functions of thickening, water retention and lubrication, and can improve the bonding strength and the crack resistance of the aggregate.
In the present invention, the mass ratio of the aluminate cement, water, the polycarboxylic acid water reducing agent, and the hydroxypropyl methylcellulose is preferably 1: 0.3-0.6: 0.005-0.02: 0.0028-0.0038, more preferably 1: 0.4-0.6: 0.01-0.015: 0.0025 to 0.0035. The combination of the aluminate cement, water, the polycarboxylic acid water reducing agent and the hydroxypropyl methyl cellulose is used as aluminate cement paste to wrap single-particle-diameter aggregate, so that the bonding strength and the crack resistance of the aggregate can be remarkably improved; and the hardening speed of the aluminate cement paste is high, and the strengthening time of the aggregate can be reduced.
In the invention, the preparation method of the aluminate cement paste is preferably to mix aluminate cement, water, a polycarboxylic acid water reducing agent and hydroxypropyl methyl cellulose. In the present invention, the mixing is preferably performed by stirring. The equipment adopted by the stirring and mixing is not particularly limited, and stirring equipment well known in the field can be adopted; in the embodiment of the present invention, the stirring and mixing is preferably performed in a forced stirrer. In the invention, the stirring and mixing speed is preferably 20-50 r/min, more preferably 25-45 r/min, and most preferably 30-40 r/min; the stirring and mixing time is preferably 2-10 min, more preferably 2-5 min, and most preferably 3-5 min.
In the invention, the mass ratio of the single-particle-size wet aggregate to the aluminate cement paste is not particularly limited, and the aluminate cement paste is excessive. In the embodiment of the invention, the mass ratio of the single-particle-size wet aggregate to the aluminate cement paste is preferably 1: 3.
In the present invention, the mixing manner of the single-particle-size wet aggregate and the aluminate cement paste is preferably stirring mixing. The equipment adopted by the stirring and mixing is not particularly limited, and stirring equipment well known in the field can be adopted; in the embodiment of the present invention, the stirring and mixing is preferably performed in a forced stirrer. In the invention, the stirring and mixing speed is preferably 20 to 50r/min, more preferably 25 to 45r/min, and most preferably 30 to 40 r/min. The stirring and mixing time is not particularly limited, and the stirring time known in the field can ensure that the single-particle-diameter wet aggregate and the aluminate cement paste are uniformly mixed.
In the invention, the screen hole size of the screen used in the second screening treatment is preferably 1-3 mm smaller than the size of a single-particle-diameter aggregate, more preferably 1.5-2.5 mm, and most preferably 1.5-2 mm smaller than the size of the single-particle-diameter aggregate. In the present invention, after the second screening treatment, the undersize fraction is excess aluminate cement slurry, and the oversize fraction is subjected to a subsequent third screening treatment. In the invention, the excessive aluminate cement paste is preferably reused for the mixing step with the wet aggregate, so that the utilization rate of the aluminate cement paste is improved, and the production cost is reduced.
In the invention, the screen hole size of the screen used in the third screening treatment is preferably 1-3 mm larger than the size of a single-particle-diameter aggregate, more preferably 1.5-2.5 mm larger than the size of the single-particle-diameter aggregate, and most preferably 2-2.5 mm larger than the size of the single-particle-diameter aggregate. In the present invention, the sieve used in the third screening process is preferably a vibrating sieve. In the invention, the single-particle-diameter aggregate wrapped with aluminate cement paste can be separated after the third screening treatment, and the phenomenon of particle adhesion is avoided.
In the present invention, the curing preferably includes hot air curing and natural curing, which are sequentially performed. In the invention, the temperature of hot air for hot air curing is preferably 30-50 ℃, and more preferably 35-45 ℃; the pressure for the hot gas curing is preferably 0.1 to 0.4MPa, more preferably 0.2 to 0.3 MPa. In the present invention, the hot gas is preferably hot compressed air. In the present invention, the hot gas curing is preferably performed in a curing tower; the height of the maintenance tower is preferably 10-30 m, and more preferably 15-25 m; the diameter of the curing tower is preferably 0.5-2 m, and more preferably 1-1.5 m. In the invention, the direction of the air flow is preferably opposite to the direction of the flow of the coated aggregate in the hot air curing. In the present invention, the hot air curing enables rapid setting and hardening of the aluminate cement paste including the aluminate cement wrapped on the surface of the aggregate.
In the invention, the humidity of the natural curing is preferably 40-80%, more preferably 50-70%, and most preferably 55-65%; the preferable temperature of the natural curing is 10-40 ℃, and more preferably 15-35 ℃. In the present invention, the time for the natural curing is preferably 1 to 7 days, more preferably 2 to 6 days, and most preferably 3 to 5 days.
The traditional cement paste wrapping and strengthening method needs to spread the aggregates wrapped with cement paste on a film so as to disperse the aggregate particles, prevent the aggregate particles from being bonded together, and has the disadvantages of troublesome spreading operation, large occupied space for spreading, long maintenance time and the like, so that continuous large-scale production cannot be realized. The aggregate is sequentially subjected to shaping treatment, first screening treatment and wetting treatment, and then the wetted aggregate is wrapped by aluminate cement paste with specific composition, so that the strength of the aggregate is improved; controlling the second screening treatment and the third screening treatment to avoid the adhesion of the aggregates wrapped with cement paste; the subsequent curing treatment further improves the strength of the aggregate, realizes the surface strengthening of the porous aggregate and is suitable for large-scale production.
The invention provides equipment used in the method of the technical scheme, as shown in figure 1, the equipment comprises an aggregate shaping part 1, a conveyor belt 2, a wetting part 3, a first vibrating screen 4, a mixed discharging part 5, a cement paste recycling part 6, a hopper 7 and a maintenance tower 8 which are connected in sequence;
the cement slurry recovery part 6 is provided with a second vibrating screen 6-1; the second vibrating screen 6-1 has an inclined angle towards the maintenance tower 8;
a third vibrating screen 8-1 is arranged in the maintenance tower 8; hot gas is filled in the maintenance tower 8.
The apparatus provided by the present invention comprises an aggregate shaping part 1. In the present invention, the aggregate shaping part 1 is used for shaping the aggregate. In the present invention, the aggregate shaping part is preferably a high-efficiency vertical shaft impact crusher.
The apparatus provided by the present invention comprises a conveyor belt 2. In the present invention, the conveyor belt 2 is connected to an outlet of the aggregate shaping portion 1. In the present invention, the conveyor belt 2 serves to convey the shaped coarse aggregate treated by the aggregate shaping part 1 into the wetting part 3.
The present invention provides an apparatus comprising a moistening section 3. In the present invention, the inlet of the moistening section 3 is connected to the conveyor belt 2. In the invention, the moistening part 3 is preferably provided with a multi-pipe water mist spray pipe, and the multi-pipe water mist spray pipe can realize multi-directional spraying and moistening treatment on the aggregate.
The present invention provides an apparatus comprising a first vibrating screen 4. In the present invention, the first vibrating screen 4 is connected to the outlet of the moistening section 3. In the invention, the first vibrating screen 4 is preferably arranged to be inclined towards the mixing and discharging part 5, and the included angle between the first vibrating screen 4 and the horizontal plane is preferably 10-36 degrees.
The apparatus provided by the invention comprises a mixing and discharge section 5. In the invention, the mixing and discharging part 5 is preferably provided with an aggregate batching hopper 5-1, an additive and water conveying pipe 5-2, a stirrer 5-3 and a discharging hopper 5-4; the aggregate batching hopper 5-1 and the additive and water conveying pipe 5-2 are preferably respectively connected with a feeding port of the stirrer 5-3, and an inlet of the discharging hopper 5-4 is communicated with an outlet of the stirrer 5-3. In the present invention, the stirrer is preferably a forced stirrer.
The equipment provided by the invention comprises a cement paste recovery part 6, wherein the cement paste recovery part 6 is provided with a second vibrating screen 6-1; the angle of inclination of the second vibrating screen 6-1 to the maintenance tower 8. In the invention, the cement slurry recovery part 6 is preferably further provided with a slurry collecting hopper 6-2, a cement slurry pump 6-3 and a cement slurry recovery pipe 6-4, and the upper port of the slurry collecting hopper 6-2 is used for receiving undersize partial slurry of the second vibrating screen 6-1; the cement slurry pump 6-3 is used for pumping surplus aluminate cement slurry into the stirrer 5-3 through a cement slurry recycling pipe 6-4; the lower port of the slurry collecting hopper 6-2, the cement slurry pump 6-3, the cement slurry recycling pipe 6-4 and the stirrer 5-3 are sequentially connected.
The equipment provided by the invention comprises a hopper 7, wherein the hopper 7 is used for receiving the oversize part of the raw material of the second vibrating screen 6-1 and conveying the received raw material to the maintenance tower 8.
The equipment provided by the invention comprises a maintenance tower 8, wherein the maintenance tower 8 is sequentially provided with a third vibrating screen 8-1, a buffer plate 8-2, a discharge pipe 8-3, a hot air pipe 8-4, an exhaust fan 8-5 and a hot air recovery pipe 8-6 from top to bottom; the third vibrating screen 8-1 and the buffer plate 8-2 are arranged inside the maintenance tower 8; in the invention, the direct fall of the third vibrating screen 8-1 and the outlet of the hopper 7 is 5-15 cm; the buffer plate 8-2 is arranged at the bottom end of the maintenance tower; the third vibrating screen 8-1 is used for receiving the raw materials falling into the hopper 7; the buffer plate 8-2 is used for receiving the undersize fraction raw material of the third vibrating screen 8-1; the discharging pipe 8-3 is connected with the buffer plate 8-2. In the invention, two ports of the hot air recovery pipe 8-6 are respectively connected with the top end and the bottom end of the maintenance tower 8, and the exhaust fan 8-5 is arranged near the port of the hot air recovery pipe 8-6 close to the top end of the maintenance tower 8. In the invention, hot air is filled in the maintenance tower 8, and the air flow direction of the hot air is from the bottom to the top of the maintenance tower 8. In the invention, the hot air enters the bottom of the curing tower 8 through the hot air pipe 8-4, and the hot air reaching the top of the curing tower 8 returns to the bottom of the curing tower 8 through the exhaust fan 8 and the hot air recycling pipe 8-6 to be recycled in the hot air curing process. In the present invention, the material of the buffer plate 8-2 is preferably a polyurethane foam plate.
In the present invention, the inclination angle of the second vibrating screen 6-1 to the curing tower 8 is preferably 3 to 26 °, more preferably 5 to 25 °, and most preferably 10 to 20 °. According to the invention, the second vibrating screen 6-1 is provided with a certain inclination angle, so that raw materials can slide into the hopper. In the invention, the fall of the second vibrating screen 6-1 and the hopper 7 is preferably 5-30 cm, and more preferably 10-25 cm. The invention controls the fall of the second vibrating screen 6-1 and the hopper 7 in the range to facilitate blanking and can control the hardening time of the aggregate.
The apparatus provided by the present invention preferably further comprises a conveyor belt 9 and a storage bin 10. In the invention, the discharge pipe 8-3, the conveyor belt 9 and the storage bin 10 are connected in sequence. In the present invention, the storage silo functions to provide a natural maintenance environment.
The following describes a specific method for surface strengthening of aggregate by using the apparatus provided by the present invention with reference to fig. 1, comprising the following steps:
the aggregate enters the aggregate shaping part 1 for shaping treatment to obtain shaped coarse aggregate; the shaping coarse aggregate falls into a wetting part 3 through a conveyor belt 2 for wetting treatment to obtain wetted aggregate; the wet aggregate falls into a first vibrating screen 4 to be subjected to first screening treatment, the undersize part is single-particle-diameter wet aggregate, falls into a stirrer 5-3 through an aggregate batching hopper 5-1 to be uniformly mixed with aluminate cement slurry, falls into the surface of a second vibrating screen 6-1 through a lower hopper 5-3 to be subjected to second screening treatment, the redundant aluminate cement slurry is screened and falls into a slurry collecting hopper 6-2, is pumped into the stirrer 5-3 through a cement slurry recycling pipe 6-4 by a cement slurry pump 6-3 to be mixed with the wet aggregate, the oversize part falls into a hopper 7 after being screened, then falls onto a third vibrating screen 8-1 to be subjected to third screening treatment, the undersize part is aggregate wrapped with cement slurry, and is cured by hot air flowing from the bottom to the top of a curing tower 8-1 in the process of falling onto a buffer plate 8-2, obtaining aggregate wrapped with hardened cement, and returning hot air at the top of the curing tower 8 to the bottom of the curing tower 8 through an exhaust fan 8-5 and a hot air recovery pipe 8-6 for recycling in the hot air curing process; the aggregate wrapped with the hardened cement sequentially passes through a discharge pipe 8-3 and a conveyor belt 9 and falls into a storage bin 10 for natural maintenance.
The equipment part for reinforcing the surface of the aggregate is simple. The equipment provided by the invention is used for surface strengthening of the aggregate, the process is simple, the time consumption for surface strengthening is short, and continuous and large-scale production can be realized.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Shaping the autoclaved aerated concrete block aggregate by a self-impact and friction method through an aggregate shaping part 1 to obtain a shaping coarse aggregate which is close to a round shape or an oval shape; the shaped coarse aggregate falls into the wetting part 3 through the conveyor belt 2 and is sprayed by water mist to obtain wetted aggregate with the water content of 18%;
the wet aggregate falls into a first vibrating screen 4 for first screening treatment, the lower part of the screen is single-particle-diameter wet aggregate, the particle diameter of the single-particle-diameter wet aggregate is 6mm, and the cylinder pressure strength is 1.6 MPa;
the single-particle-size wet aggregate falls into a stirrer 5-3 through an aggregate batching hopper 5-1 to be uniformly stirred and mixed with aluminate cement slurry, falls into a second vibrating screen 6-1 (the size of a screen hole is 4mm, the inclination angle is 25 degrees) through a discharging hopper 5-4 to be subjected to second screening treatment, redundant aluminate cement slurry falls into a slurry collecting hopper 6-2 after being screened, is pumped into the stirrer 5-3 by a cement slurry pump 6-3 through a cement slurry recycling pipe 6-4 to be reused for being mixed with the wet aggregate, falls into a hopper 7 after being screened, and then falls into a third vibrating screen 8-1 (the size of a screen is 8mm) to be subjected to third screening treatment; wherein the mass ratio of the single-particle-diameter wet aggregate to the aluminate cement paste is 1: 3; the aluminate cement paste is prepared from the following components in percentage by mass of 1: 0.25: 0.015: 0.0025 of aluminate cement (CA50, the screen residue of a 0.045mm sieve is 4%), water, polycarboxylic acid water reducing agent (solid content is 35%) and hydroxypropyl methyl cellulose (viscosity is 15000mPa & s) are stirred in a forced stirrer at the speed of 40r/min for 3min to obtain the cement;
the part below the screen of the third screen is aggregate wrapped with cement paste, the aggregate is maintained in a maintenance tower 8 (with the height of 15m and the diameter of 0.8m) under the condition of hot gas (40 ℃), the aggregate wrapped with hardened aluminate cement paste obtained by hot gas maintenance falls into a cushion pad, the aggregate is conveyed into a storage bin 10 through a discharge pipe 8-3 and a conveyor belt 9, the aggregate is naturally maintained for 3 days under the conditions of the humidity of 60% and the temperature of 25 ℃, and the barrel pressure strength of the finally obtained aggregate is 5.4 MPa; the hot air at the top of the curing tower 8 returns to the bottom of the curing tower 8 through an exhaust fan 8-5 and a hot air recycling pipe 8-6 to be reused in the hot air curing process.
Wherein the cylinder pressure strength is tested according to the lightweight aggregate and the test method thereof, the second part of the lightweight aggregate test method GB/T17431.2.
Example 2
Shaping the autoclaved aerated concrete block aggregate by a self-impact and friction method through an aggregate shaping part 1 to obtain a shaping coarse aggregate which is close to a round shape or an oval shape; the shaped coarse aggregate falls into the wetting part 3 through the conveyor belt 2 and is sprayed by water mist to obtain wetted aggregate with the water content of 10%;
the wet aggregate falls into a first vibrating screen 4 for first screening treatment, the lower part of the screen is single-particle-diameter wet aggregate, the particle diameter of the single-particle-diameter wet aggregate is 5mm, and the cylinder pressure strength is 1.0 MPa;
the single-particle-size wet aggregate falls into a stirrer 5-3 through an aggregate batching hopper 5-1 to be uniformly stirred and mixed with aluminate cement slurry, falls into a second vibrating screen 6-1 (the size of a screen hole is 4mm, the inclination angle is 20 degrees) through a discharging hopper 5-4 to be subjected to second screening treatment, redundant aluminate cement slurry falls into a slurry collecting hopper 6-2 after being screened, is pumped into the stirrer 5-3 by a cement slurry pump 6-3 through a cement slurry recycling pipe 6-4 to be reused for being mixed with the wet aggregate, falls into a hopper 7 after being screened, and then falls into a third vibrating screen 8-1 (the size of a screen is 8mm) to be subjected to third screening treatment; wherein the mass ratio of the single-particle-diameter wet aggregate to the aluminate cement paste is 1: 3; the aluminate cement paste is prepared from the following components in percentage by mass of 1: 0.20: 0.02: 0.003 of aluminate cement (CA80, 0.045mm sieve residue is 0.5 percent), water, polycarboxylic acid water reducing agent (solid content is 40 percent) and hydroxypropyl methyl cellulose (viscosity is 20000mPa & s) are stirred in a forced stirrer at the speed of 40r/min for 4min to obtain the product;
the part below the screen of the third screen is aggregate wrapped with cement paste, the aggregate is maintained in a maintenance tower 8 (with the height of 12m and the diameter of 0.6m) under the condition of hot gas (50 ℃), the aggregate wrapped with hardened aluminate cement paste obtained by hot gas maintenance falls into a cushion pad 8-2, the aggregate is conveyed into a storage bin 10 through a discharge pipe 8-3 and a conveyor belt 9, the aggregate is naturally maintained for 3 days under the conditions of the humidity of 65% and the temperature of 20 ℃, and the barrel pressure strength of the finally obtained aggregate is 8.0 MPa; the hot air at the top of the curing tower 8 returns to the bottom of the curing tower 8 through an exhaust fan 8-5 and a hot air recycling pipe 8-6 to be reused in the hot air curing process.
Wherein the cylinder pressure strength is tested according to the lightweight aggregate and the test method thereof, the second part of the lightweight aggregate test method GB/T17431.2.
Example 3
Shaping the autoclaved aerated concrete block aggregate by a self-impact and friction method through an aggregate shaping part 1 to obtain a shaping coarse aggregate which is close to a round shape or an oval shape; the shaped coarse aggregate falls into the wetting part 3 through the conveyor belt 2 and is sprayed by water mist to obtain wetted aggregate with the water content of 20%;
the wet aggregate falls into a first vibrating screen 4 for first screening treatment, the lower part of the screen is single-particle-diameter wet aggregate, the particle diameter of the single-particle-diameter wet aggregate is 10mm, and the cylinder pressure strength is 0.8 MPa;
the single-particle-size wet aggregate falls into a stirrer 5-3 through an aggregate batching hopper 5-1 to be uniformly stirred and mixed with aluminate cement slurry, falls into a second vibrating screen 6-1 (the size of a screen hole is 7mm, the inclination angle is 14 degrees) through a discharging hopper 5-4 to be subjected to second screening treatment, redundant aluminate cement slurry falls into a slurry collecting hopper 6-2 after being screened, is pumped into the stirrer 5-3 by a cement slurry pump 6-3 through a cement slurry recycling pipe 6-4 to be reused for being mixed with the wet aggregate, falls into a hopper 7 after being screened, and then falls into a third vibrating screen 8-1 (the size of a screen is 12mm) to be subjected to third screening treatment; wherein the mass ratio of the single-particle-diameter wet aggregate to the aluminate cement paste is 1: 3; the aluminate cement paste is prepared from the following components in percentage by mass of 1: 0.20: 0.02: 0.003 of aluminate cement (CA70, the screen residue of a 0.045mm sieve is 2 percent), water, a polycarboxylic acid water reducing agent (the solid content is 35 percent) and hydroxypropyl methyl cellulose (the viscosity is 20000mPa & s) are stirred in a forced stirrer at the speed of 40r/min for 4min to obtain the product;
the part below the screen of the third screen is aggregate wrapped with cement paste, the aggregate is maintained in a maintenance tower 8 (with the height of 10m and the diameter of 0.7m) under the condition of hot gas (45 ℃), the aggregate wrapped with hardened aluminate cement paste obtained by hot gas maintenance falls into a cushion pad 8-2, the aggregate is conveyed into a storage bin 10 through a discharge pipe 8-3 and a conveyor belt 9, the aggregate is naturally maintained for 2 days under the conditions of 70% of humidity and 27 ℃, and the barrel pressure strength of the finally obtained aggregate is 4.2 MPa; the hot air at the top of the curing tower 8 returns to the bottom of the curing tower 8 through an exhaust fan 8-5 and a hot air recycling pipe 8-6 to be reused in the hot air curing process.
Wherein the cylinder pressure strength is tested according to the lightweight aggregate and the test method thereof, the second part of the lightweight aggregate test method GB/T17431.2.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The aggregate surface strengthening method is characterized by comprising the following steps:
shaping aggregate to obtain shaped coarse aggregate; the porosity of the aggregate is more than or equal to 30 percent, and the pore diameter is more than or equal to 0.1 mm;
wetting the shaping coarse aggregate to obtain a wetted aggregate;
carrying out first screening treatment on the wetted aggregate to obtain single-particle-diameter wetted aggregate;
mixing the single-particle-size wet aggregate with aluminate cement paste, performing second screening treatment, performing third screening treatment on the oversize part of the second screening, and then performing maintenance treatment on the undersize part of the third screening;
the aluminate cement paste comprises aluminate cement, water, a polycarboxylic acid water reducing agent and hydroxypropyl methyl cellulose; the mass ratio of the aluminate cement to the water to the polycarboxylic acid water reducing agent to the hydroxypropyl methyl cellulose is 1: 0.20-0.6: 0.002-0.20: 0.002-0.004.
2. The surface strengthening method of claim 1, wherein the aggregate comprises one or more of autoclaved aerated concrete blocks, pumice, scoria, ceramsite, expanded slag beads and expanded perlite.
3. The surface strengthening method of claim 1, wherein the polycarboxylate superplasticizer is provided in the form of a polycarboxylate solution, and the solid content of the polycarboxylate solution is 20-42%.
4. The surface strengthening method according to claim 1, wherein the shaping method comprises one or more of a grinding method, a self-impact-friction method and an impact method;
the size of the single-particle-size aggregate is 4-40 mm;
the size of a sieve hole of the sieve used in the second sieving treatment is 1-3 mm smaller than that of the single-particle-diameter aggregate; and the size of the sieve mesh of the sieve used for the third screening treatment is 1-3 mm larger than that of the single-particle-diameter aggregate.
5. The surface strengthening method according to claim 1, wherein the wet aggregate has a water content of 5 to 40%.
6. The surface strengthening method according to claim 1, wherein the curing includes a hot air curing and a natural curing which are sequentially performed;
the temperature of hot air for hot air curing is 30-50 ℃;
the humidity of the natural curing is 40-80%, the temperature is 10-40 ℃, and the time is 1-7 days.
7. The equipment used in the method of any one of claims 1 to 6, characterized by comprising an aggregate shaping part (1), a conveyor belt (2), a wetting part (3), a first vibrating screen (4), a mixing and discharging part (5), a cement paste recovery part (6), a hopper (7) and a maintenance tower (8) which are connected in sequence;
the cement slurry recovery part (6) is provided with a second vibrating screen (6-1); the second vibrating screen (6-1) has an inclined angle towards the maintenance tower (8);
a third vibrating screen (8-1) is arranged in the maintenance tower (8); the maintenance tower (8) is internally provided with hot air.
8. The equipment of claim 7, wherein the mixing and discharging part (5) is further provided with an aggregate batching hopper (5-1), an admixture and water conveying pipe (5-2), a stirrer (5-3) and a discharging hopper (5-4); the inlet of the discharging hopper (5-4) is communicated with the outlet of the stirrer (5-3);
the cement slurry recovery part (6) is also provided with a slurry collecting hopper (6-2), a cement slurry pump (6-3) and a cement slurry recovery pipe (6-4), and the upper port of the slurry collecting hopper (6-2) is used for receiving the slurry below the screen of the second vibrating screen (6-1); the lower port of the slurry collecting hopper (6-2), the cement slurry pump (6-3), the cement slurry recycling pipe (6-4) and the stirrer (5-3) are sequentially connected.
9. The apparatus according to claim 7 or 8, further comprising a conveyor belt (9) and a storage bin (10);
the maintenance tower (8) is also internally provided with a buffer plate (8-2), a discharge pipe (8-3), a hot air pipe (8-4), an exhaust fan (8-5) and a hot air recovery pipe (8-6);
the buffer plate (8-2), the discharge pipe (8-3), the conveyor belt (9) and the storage bin (10) are sequentially connected;
the hot air pipe (8-4) is arranged at the bottom end of the maintenance tower (8), two ports of the hot air recovery pipe (8-6) are respectively connected with the top end and the bottom of the maintenance tower (8), and the exhaust fan (8-5) is arranged in the hot air recovery pipe (8-6).
10. The apparatus according to claim 7 or 8, characterized in that the angle of inclination of the second vibrating screen (6-1) towards the maintenance tower (8) is 3-26 °;
the fall of the second vibrating screen (6-1) and the lower port of the hopper (7) is 5-30 cm;
the third vibrating screen (8-1) is horizontally arranged.
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