CN113912343B - Building plastering mortar suitable for robot and preparation method thereof - Google Patents
Building plastering mortar suitable for robot and preparation method thereof Download PDFInfo
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- CN113912343B CN113912343B CN202111141205.8A CN202111141205A CN113912343B CN 113912343 B CN113912343 B CN 113912343B CN 202111141205 A CN202111141205 A CN 202111141205A CN 113912343 B CN113912343 B CN 113912343B
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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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- 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
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
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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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
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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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/16—Acids or salts thereof containing phosphorus in the anion, e.g. phosphates
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
- C04B24/06—Carboxylic acids; Salts, anhydrides or esters thereof containing hydroxy groups
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/10—Carbohydrates or derivatives thereof
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/18—Lignin sulfonic acid or derivatives thereof, e.g. sulfite lye
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
Abstract
The invention discloses building plastering mortar suitable for a robot, which consists of the following materials in parts by weight: 114-132 parts of cement; 211-223 parts of dry sand; 439-465 parts of machine-made sand; 38-44 parts of fly ash; 18-22 parts of silica fume; 12-16 parts of ground slag; 6-8 parts of a steel slag admixture; 1-1.7 parts of polyhydroxy carboxylic acid type salt; 0.8-1 part of alkylbenzene sulfonate; 0.7-0.8 part of polycarboxylic acid; 0.3-0.5 part of air entraining agent; 0.5-0.7 part of dispersant. The components of the invention are cooperated to improve the performance of the mortar, especially the cooperation of the ground slag, the steel slag admixture and the fly ash can greatly reduce the hydration heat of the cementing material, the filling effect of the combination of the steel slag powder and the slag powder is higher than that of the single-doped fly ash, the super-superposition effect is good, the fluidity and the cohesiveness are better, and the pumping is more suitable. In addition, the synergistic cooperation of the polyhydroxy carboxylic acid salt, the alkylbenzene sulfonic acid and the polycarboxylic acid is beneficial to improving the pumping performance of the mortar mixture, thereby being suitable for long-distance conveying and improving the automatic construction efficiency.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to building plastering mortar suitable for a robot and a preparation method thereof.
Background
With the high-speed development of the building industry and the large application of new building material and new technology, the traditional building materials and process cannot meet the requirements of construction quality, and particularly, the traditional field configuration and construction mode of mortar not only causes extreme waste of resources and huge damage to the environment, but also cannot meet the requirements of building energy conservation, thereby hindering the pace of upgrading of the construction process. In order to protect and improve the environment, promote the comprehensive utilization of resources and ensure the quality of construction projects, according to the relevant laws and regulations of national regulations on promoting the development and application of bulk cement, national regulations on preventing and controlling atmospheric pollution and the like, and the development situation of domestic premixed mortar, a notice of an implementation method for accelerating the development of premixed mortar is issued by urban and rural construction halls, the premixed mortar is required to be used in a construction site, and advanced construction methods such as mechanical pumping, mortar spraying and the like are encouraged to be adopted in order to improve the quality and the efficiency of plastering construction.
In recent years, the premixed mortar industry all over the country has great changes in production process, product quality, enterprise scale, technical equipment, modernized logistics and the like under the joint promotion of governments, enterprises and markets, particularly in the aspect of mechanical spraying technology. Although various mechanical equipment, construction operation technologies and construction methods make great progress in technical research, a few common faults exist, and popularization of mechanical spraying of the premixed mortar is restricted.
The wall plastering refers to the engineering of plastering cement mortar, mixed mortar and lime mortar surface layers on the wall, wherein the mortar is smeared on the surface of a base material, has the functions of protecting a base layer and improving the appearance, and provides special functions for buildings. The plastering engineering has two major functions: the wall surface has the advantages that firstly, the wall surface has a protection function, the wall surface is protected from being eroded by wind, rain and snow, the moistureproof, weathering and heat insulation capabilities of the wall surface are improved, and the durability and thermal performance of the wall body are improved; and secondly, the functions of beautifying, improving indoor sanitary conditions, purifying air, beautifying the environment and improving the living comfort level are realized.
The existing wall surface mortar scraping is mostly carried out manually, the labor intensity is high, time and labor are wasted, the flatness is not high, and certain dangerousness is realized for high-altitude operation. The problem has been solved in the appearance of plastering robot, however, the current manual plastering mortar that uses has low mobility, the bleeding rate is high and can not satisfy mechanized construction, and the pipe is blocked up very easily, increases the work load of artifical mediation, and the utilization ratio is low. Even if can adapt to the pumping, also because of long distance receives the pressure influence, the mortar mixture is inhomogeneous, when influence construction back thickness can't play the effect of making level, appear fracture, hollowing, peel off scheduling problem on the contrary after applying paint with a brush, be difficult to adapt to present market demand.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides building plastering mortar suitable for a robot and a preparation method thereof.
The building plastering mortar suitable for the robot is characterized by comprising the following materials in parts by weight:
furthermore, when the silicon ash is used for smelting ferrosilicon and industrial silicon, a large amount of SiO with strong volatility is generated in the ore-smelting electric furnace 2 And Si gas, which is formed by rapid oxidation, condensation and precipitation with air after the gas is discharged; more than 80% of the powder with fineness less than 1 μm, average particle diameter of 0.1-0.3 μm, and specific surface area of 20-28 m 2 (iv) g. The silica fume is acted by surface tension in the forming process to form the granular form of amorphous spherical particles with smooth surface, and the silica fume can replace part of fly ash to be mixed into mortar, so that tiny spheroids can play a role in lubrication. The silica fume is a volcanic ash substance with large specific surface area and high activity, can effectively reduce the pumping resistance and simultaneously effectively prevent the generation of alkali-aggregateAnd (4) reacting to avoid subsequent cracking, hollowing and the like, and properly adjusting the setting time of the mortar.
Further, the ground slag is granulated blast furnace slag in industrial slag. The fine ground slag of the invention is granulated blast furnace slag (such as a byproduct in a steel melting process) with good potential active materials in industrial waste slag, and minerals rich in silicon, calcium and iron can effectively improve the mortar performance by forming a large amount of amorphous active glass body structures or network structures in the blast furnace ironmaking process. The fine slag and the slag admixture are mutually doped to replace part of fly ash, the three are cooperated, the hydration heat of the cementing material can be greatly reduced, the filling effect of the steel slag powder and the slag powder is higher than that of the single-doped fly ash, the steel slag powder and the slag powder can have good super-superposition effect, the fluidity and the cohesiveness are better, and the pump is more suitable. Preferably, the weight portion ratio of the fly ash, the ground slag and the steel slag is (4-8) to (2) (1-1.5).
Further, the main components of the steel slag admixture are tricalcium carbonate, free calcium oxide, RO phase and dicalcium ferrite, and the mixing proportion of the steel slag admixture and the ground slag is preferably 1:
further, the polyhydroxy carboxylic acid type salt is sodium gluconate, white or light yellow crystal powder, has fresh sour taste, fixed composition and uniform structure, and the addition amount is 0.1-0.15% of the total amount. The polyhydroxycarboxylic acid type salt serving as a common retarder can play a synergistic effect after being compounded with the water reducing agent, the original working performance of the mortar is kept, the problem that the mortar is influenced by pressure to dewater and block in the pumping process is solved, the later-stage mortar strength can be effectively improved by proper mixing amount, and the later-stage mortar strength is not too much. The polyhydroxycarboxylic acid type salt of the present invention may also be sodium citrate, tartaric acid (potassium sodium) and other salts.
Furthermore, the branched alkylbenzene sulfonate is one or more of sodium dodecyl benzene sulfonate, polyacrylamide, alpha-olefin sulfonate, linear alkylbenzene sulfonate or alkyl glyceryl ether sulfonate, the addition amount of the branched alkylbenzene sulfonate is 0.08-0.1% of the total amount, and other types of anionic surfactants can also be selected. The branched alkylbenzene sulfonic acid is an important anionic surfactant, can well reduce the surface tension and wetting, penetrating and emulsifying properties of water, is easy to generate synergistic action with other substances, has stable chemical properties, and controls the fluidity of mortar mixing species.
Further, the polycarboxylic acid is a product obtained by addition polymerization of an unsaturated carboxylic acid monomer, such as polyacrylic acid, polymethacrylic acid. Preferably, the polycarboxylic acid is synthesized by taking Ammonium Persulfate (APS) as an initiator and Acrylic Acid (AA), cinnamic acid (CINN), isopentenol polyoxyethylene ether (TPEG) and 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) as reaction monomers through free radical copolymerization, a molecular structure contains carboxyl, hydroxyl, benzene ring and other groups, cement particles are dispersed through steric hindrance, a good effect is achieved, and the addition amount is 0.7-0.8% of the total amount. The polycarboxylic acid high-performance water reducing agent is a green, environment-friendly, non-flammable and non-explosive cement dispersing agent. Compared with traditional water reducing agents such as lignosulfonate and naphthalene sulfonate formaldehyde condensate, the new-generation polycarboxylate water reducing agent has stronger molecular structure adjustability, can achieve better performance by relatively lower mixing amount, reduces mortar bleeding and effectively improves shrinkage.
Furthermore, the air entraining agent is rosin resins, alkyl and alkyl aromatic hydrocarbon sulfonic acids, fatty alcohol sulfonates and saponins. Preferably, the invention adopts a saponin air entraining agent DH-4013-1, and the addition amount is 0.6-0.7% of the total amount. The air entraining agent is a hydrophobic surfactant, a large amount of micro bubbles are easily generated when the air entraining agent is stirred in a mortar mixture, the micro bubbles are uniformly distributed in the mixture, the water-cement ratio is kept unchanged, meanwhile, the air content is increased by 1 percent, and the fluidity, the water retention property and the cohesiveness of the mixture are improved. The lower mixing amount can improve the bleeding and the segregation in the pumping process and improve the volume stability of the mortar mixture.
Furthermore, the dispersing agent is sodium hexametaphosphate, is in the form of white powder crystals, is used for being matched with polycarboxylic acid, and has better effect than trisodium phosphate, and the addition amount is 0.06% -0.08%. The dispersant is silicate in common inorganic dispersant. The hydroscopic property is very strong, and the hydroscopic property is that the hydroscopic property is exposed in the air, and the hydroscopic property can gradually absorb water to form a sticky substance, so that the substances of solid or liquid particle aggregation in a dispersion system are reduced, and the long-term long-distance transportation is adapted to mechanical pumping.
Furthermore, the machine-made sand is quartz particles formed by crushing and processing quartz stones, a natural high-quality quartz sand deposit is used as a raw material, and the natural structure of the quartz stones is effectively protected through a series of production processes such as mechanical crushing, rolling and rolling, washing and screening, drying and screening, vibration classification and the like. Preferably, the machine-made sand is type I sand, the particle composition is a machine-made sand 2 area, and the fineness modulus is as follows: 3.0 to 2.3.
The invention also provides a preparation method of the building plastering mortar suitable for the robot, which comprises the following steps:
s1, selecting raw materials: preparing the following materials in parts by weight: 114-132 parts of cement; 211-223 parts of dry sand; 439-465 parts of machine-made sand; 38-44 parts of fly ash; 18-22 parts of silica fume; 12-16 parts of ground slag; 6-8 parts of a steel slag admixture; 1-1.7 parts of polyhydroxy carboxylic acid type salt; 0.8-1 part of alkylbenzene sulfonate; 0.7-0.8 part of polycarboxylic acid; 0.3-0.5 part of air entraining agent; 0.5-0.7 part of dispersant;
s2, screening dry sand: selecting raw materials according to the step S1, wherein the dry sand is screened, and a particle size distribution II area with the fineness of 2.3-2.6 is selected; the machine-made sand has the same grain composition and fineness, and the redundant floating powder is screened out;
s3, preparing an additive: pouring the weighed polyhydroxy carboxylic acid salt, alkylbenzene sulfonate, polycarboxylic acid, air entraining agent and dispersing agent into a special additive mixer, stirring for 3 minutes, and uniformly mixing;
s4, mortar preparation: and pouring the weighed admixture of the cement, the dry sand, the machine-made sand, the fly ash, the silica fume, the ground slag and the steel slag into a dry-mixed mortar stirrer, stirring for 9 minutes in the middle and reverse directions respectively, adding the admixture prepared in the step S3, and stirring for 4 minutes by high-frequency pulses to complete the preparation of a dry mixture of the mortar.
The invention has the following beneficial effects:
(1) The components are cooperated to improve the performance of the mortar, particularly, the ground slag, the steel slag admixture and the fly ash are cooperated to greatly reduce the hydration heat of the cementing material, the filling effect of the combination of the steel slag powder and the slag powder is higher than that of the single-doped fly ash, the super-additive effect is good, the fluidity and the cohesiveness are better, and the pumping is more suitable.
(2) The industrial waste slag (the milled slag and the steel slag admixture) is added into the raw materials, so that the solid waste is effectively utilized, and the cost is better saved; on the other hand, the method is suitable for the aim of realizing low-carbon green development by carrying out clean production in the whole premixed mortar industry.
(3) The synergistic cooperation of the polyhydroxy carboxylic acid salt, the alkylbenzene sulfonic acid and the polycarboxylic acid is beneficial to improving the pumping performance of the mortar mixture, thereby being suitable for long-distance conveying and improving the automatic construction efficiency.
(4) And simultaneously, the saponin air entraining agent and the sodium hexametaphosphate are selected to be matched for use, so that the water retention and the anti-sagging performance of the mortar are effectively ensured even under the condition of high-pressure pumping, and a good effect is finally achieved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
The robot plastering mortar dry powder comprises the following components:
wherein, the requirements and parameters or models of each component are as follows: the cement is 42.5 of GB175 medium silicate cement; the machine-made sand is class I machine-made sand in GB/T14684, medium sand. Dry sandIs I-type natural sand and medium sand in GB/T14684; the fly ash is the fly ash for the II-grade mixed mortar and concrete in GB/T1596; more than 80% of silica fume with fineness less than 1 μm, average particle diameter of 0.1-0.3 μm, and specific surface area of 20-28 m 2 (ii)/g; the ground slag is granulated blast furnace slag with a specific surface area of 420m 2 /kg～450m 2 (iv) kg; the steel slag admixture is steel-making waste slag with a specific surface area of 450m 2 Per kg; the polyhydroxy carboxylic acid type salt is sodium gluconate powder; the polycarboxylic acid is polyacrylic acid crystal powder; the air entraining agent is fructus Gleditsiae Abnormalis air entraining agent DH-4013-1; the dispersant is sodium hexametaphosphate crystal powder;
the preparation method of the robot plastering mortar dry powder comprises the following steps: (1) The weighed additives are prepared and poured into a special additive mixer to be stirred for 3 minutes and mixed evenly; (2) And pouring the weighed powder and aggregate into a dry-mixed mortar stirrer, stirring for 9 minutes respectively in the middle and forward and reverse directions, adding the prepared admixture, and stirring for 4 minutes by high-frequency pulses to complete the preparation of a dry mixture of the mortar.
The preparation method of the robot plastering mortar comprises the following steps: and pouring 100kg of prepared sample into a small mortar stirrer, adding water, stirring for 3min, and adding water for subsequent testing when the consistency is 95 +/-5 mm according to a JGJ/T70 consistency measurement method.
Example 2
The robot plastering mortar dry powder comprises the following components:
wherein, the requirements and parameters or models of each component are as follows: the cement is 42.5 of GB175 medium silicate cement; the machine-made sand is class I machine-made sand in GB/T14684, medium sand. The dry sand is I-type natural sand and medium sand in GB/T14684; the fly ash is the fly ash for the II-grade mixed mortar and concrete in GB/T1596; more than 80% of silica fume with fineness less than 1 μm, average particle diameter of 0.1-0.3 μm, and specific surface area of 20-28 m 2 (ii)/g; the ground slag is granulated blast furnace slag with a specific surface area of 420m 2 /kg～450m 2 Per kg; the steel slag admixture is steel-making waste slag with a specific surface area of 450m 2 (iv) kg; the polyhydroxy carboxylic acid type salt is sodium gluconate powder; the polycarboxylic acid is polyacrylic acid crystal powder; the air entraining agent is fructus Gleditsiae Abnormalis air entraining agent DH-4013-1; the dispersant is sodium hexametaphosphate crystal powder;
the preparation method of the robot plastering mortar dry powder comprises the following steps: (1) The weighed additives are prepared and poured into a special additive mixer to be stirred for 3 minutes and mixed evenly; (2) And pouring the weighed powder and aggregate into a dry-mixed mortar stirrer, stirring for 9 minutes respectively in the middle-forward and reverse directions, adding the prepared admixture, and stirring for 4 minutes by high-frequency pulse to complete the preparation of a dry mixture of the mortar.
The preparation method of the robot plastering mortar comprises the following steps: and pouring 100kg of prepared sample into a small mortar stirrer, adding water, stirring for 3min, and performing subsequent tests without adding water when the consistency is 95 +/-5 mm according to a JGJ/T70 consistency measurement method.
Performance test
1. The water retention performance of the plastering mortar is detected according to JGJ/T70, and the detection result is recorded in Table 1; the fluidity is tested according to the specification of GBT2419-2005, wherein the cement mortar mixture is replaced by the mortar mixture; the pressurized bleeding rate was measured according to the regulations of GB/T25181-2019, and the measurement results are shown in Table 1.
TABLE 1
2. Detection of sag resistance of mortar mixture
1) Test subjects: the mortar mixtures from examples 1 and 2, after being pumped through the machine, were taken as test specimens, each set of test specimens having the same initial weight: taking common plastering mortar as a comparison test; the test substrate was a normal unpainted wall surface.
2) The test method comprises the following steps: coating each group of samples on the surface of the wall surface in the same coating mode, observing the thickest scraping thickness which can be achieved under the condition of no sagging, and recording the scraping thickness;
3) The test result shows that the thicker the blade coating thickness is, the stronger the adhesion of the plastering mortar is, and the better the sag resistance is. The thickest batch thickness is recorded in table 2.
TABLE 2
| Test specimen | Thickest batch scraping thickness mm |
| Example 1 | Batch scraping 3mm non-flowing pendant |
| Example 2 | Batch scraping 3mm non-flowing pendant |
| Comparative example 1 | Batch scraping 2mm non-flowing pendant |
3 analysis of test results
1. The embodiment 1 and the embodiment 2 have good performances in the aspects of overall pumpability, anti-sagging performance and water retention performance, and can be effectively matched with the use of an actual plastering robot. It can be seen that the admixture additive components are changed, and slight changes in certain properties occur. When the polyhydroxy carboxylic acid type salt and the alkylbenzene sulfonic acid with high proportion are added, the pressure bleeding rate is small, and the overall pumping performance is improved; when the addition proportion of the air entraining agent or the dispersing agent is increased, the overall water retention and the anti-sagging performance are improved. Compared with the common plastering mortar, the anti-sagging effect is more obvious in batch scraping thickness. The embodiment can finally achieve a relatively proper performance index of the mortar mixture.
2. In the embodiments 1 and 2, the blending amount of the ground slag and steel slag admixture can be slightly added, so that a good filling effect is achieved, on one hand, the overall compressive strength is obviously increased while the construction hand feeling is effectively improved, on the other hand, the cost is saved, and on the other hand, the low-carbon green development of building materials is realized.
The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (6)
1. The building plastering mortar suitable for the robot is characterized by comprising the following materials in parts by weight:
114 to 132 parts of cement;
211 to 223 parts of dry sand;
439 to 465 parts of machine-made sand;
38-44 parts of fly ash;
18 to 22 parts of silica fume;
grinding 12 to 16 parts of slag;
6 to 8 parts of a steel slag admixture;
1 to 1.7 parts of polyhydroxy carboxylic acid type salt;
0.8 to 1 part of branched alkyl benzene sulfonate;
0.7 to 0.8 portion of polycarboxylic acid;
0.3 to 0.5 portion of air entraining agent;
0.5 to 0.7 portion of dispersant;
when the silicon ash is used for smelting ferrosilicon and industrial silicon, a large amount of SiO with strong volatility is generated in the ore-smelting electric furnace 2 And Si gas, which is formed by rapid oxidation, condensation and precipitation with air after the gas is discharged; the fineness of the powder is less than 1 mu m and accounts for more than 80 percent, the average particle diameter is 0.1-0.3 mu m, and the specific surface area is 20-28 m 2 /g；
The steel slag admixture mainly comprises tricalcium carbonate, free calcium oxide, RO phase and dicalcium ferrite, and the mixing amount ratio of the steel slag admixture to the ground slag is 1;
the polyhydroxy carboxylic acid type salt is sodium gluconate;
the branched alkylbenzene sulfonate is one or more of sodium dodecyl benzene sulfonate, polyacrylamide, alpha-olefin sulfonate, linear alkylbenzene sulfonate or alkyl glyceryl ether sulfonate.
2. The building plastering mortar suitable for robot as claimed in claim 1, wherein the ground slag is granulated blast furnace slag among industrial slag.
3. A building plastering mortar suitable for use in a robot as claimed in claim 1, wherein the polycarboxylic acid is a product obtained by addition polymerization of an unsaturated carboxylic acid monomer.
4. The building plastering mortar suitable for robots of claim 1, wherein the air-entraining agent is rosin resins, alkyl and alkyl aromatic hydrocarbon sulfonic acids, fatty alcohol sulfonates, saponins.
5. The building plastering mortar suitable for robots of claim 1, wherein the dispersant is sodium hexametaphosphate in the form of white powdery crystals.
6. The method for preparing a building plastering mortar suitable for a robot according to claim 1, comprising the steps of:
s1, selecting raw materials: preparing the following materials in parts by weight: 114 to 132 parts of cement; 211 to 223 parts of dry sand; 439 to 465 parts of machine-made sand; 38-44 parts of coal ash; 18 to 22 parts of silica fume; grinding 12-16 parts of slag in a grinding way; 6 to 8 parts of steel slag admixture; 1 to 1.7 parts of polyhydroxy carboxylic acid type salt; 0.8 to 1 part of alkylbenzene sulfonate; 0.7 to 0.8 portion of polycarboxylic acid; 0.3 to 0.5 portion of air entraining agent; 0.5 to 0.7 part of a dispersant;
s2, screening dry sand: selecting raw materials according to the step S1, wherein dry sand is screened, and a particle size distribution II area with the fineness of 2.3 to 2.6 is selected; the machine-made sand has the same grain composition and fineness, and the redundant floating powder is sieved;
s3, preparing an additive: pouring weighed polyhydroxy carboxylic acid type salt, alkylbenzene sulfonate, polycarboxylic acid, air entraining agent and dispersing agent into a special additive mixer, stirring for 3 minutes, and uniformly mixing;
s4, preparing mortar: and pouring the weighed admixture of the cement, the dry sand, the machine-made sand, the fly ash, the silica fume, the ground slag and the steel slag into a dry-mixed mortar stirrer, stirring for 9 minutes in forward and reverse directions respectively, adding the admixture prepared in the step S3, and stirring for 4 minutes by high-frequency pulses to complete the preparation of a dry mixture of the mortar.
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| CN100546933C (en) * | 2007-03-20 | 2009-10-07 | 首钢总公司 | Steel slag heat-insulating finishing mortar |
| KR101321730B1 (en) * | 2013-02-28 | 2013-10-28 | (주)문수토가 | Environmental-friendly shrinkage reducing agent and environmental-friendly plastering cement and mortar containing the same |
| CN105347753B (en) * | 2015-10-21 | 2017-09-22 | 桐乡正昶新型材料有限公司 | A kind of machine sprays motar |
| CN105645874A (en) * | 2016-01-04 | 2016-06-08 | 武汉理工大学 | High-temperature molten slag composite micropowder concrete and preparation method thereof |
| CN106365555B (en) * | 2016-08-29 | 2018-10-23 | 中建商品混凝土（福建）有限公司 | A kind of mechanical injection wet-mixing plastering mortar and preparation method thereof |
| CN109133743A (en) * | 2018-09-04 | 2019-01-04 | 徐州金盟新型建材有限公司 | A kind of machine-made sand concrete premixing mortar |
| CN109020417A (en) * | 2018-11-02 | 2018-12-18 | 辽宁壹立方砂业有限责任公司 | A kind of plastering mortar and preparation method thereof |
| CN109851269B (en) * | 2019-01-24 | 2021-07-16 | 广东新业混凝土有限公司 | Composite admixture for improving durability of common concrete through improved gradation |
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