CN116535189A - Industrial gypsum-based ready-mixed mortar and preparation method thereof - Google Patents

Industrial gypsum-based ready-mixed mortar and preparation method thereof Download PDF

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Publication number
CN116535189A
CN116535189A CN202310606472.0A CN202310606472A CN116535189A CN 116535189 A CN116535189 A CN 116535189A CN 202310606472 A CN202310606472 A CN 202310606472A CN 116535189 A CN116535189 A CN 116535189A
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industrial gypsum
mixed mortar
agent
gypsum
based ready
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凌刚
胡亮
鲁永欣
龚继武
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Wuhan Chutian Mingyang Building Materials Co ltd
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Wuhan Chutian Mingyang Building Materials Co ltd
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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
    • C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26—Silicates of the alkali metals
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/047—Zeolites
    • 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
    • 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
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142—Sulfates
    • 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
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142—Sulfates
    • C04B22/143—Calcium-sulfate
    • C04B22/144—Phosphogypsum
    • 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
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142—Sulfates
    • C04B22/143—Calcium-sulfate
    • C04B22/145—Gypsum from the desulfuration of flue gases
    • 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
    • C04B24/24—Macromolecular compounds
    • C04B24/38—Polysaccharides 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10—Accelerators; Activators
    • C04B2103/12—Set accelerators
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/44—Thickening, gelling or viscosity increasing agents
    • 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
    • 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 provides industrial gypsum-based ready-mixed mortar and a preparation method thereof, wherein the industrial gypsum-based ready-mixed mortar comprises industrial gypsum, mineral powder, cement, machine-made sand, a coagulant, an exciting agent, an internal curing agent, an air entraining agent, a water reducing agent and water; the accelerator comprises one or two of polymeric ferric sulfate silicate and polymeric ferric aluminum silicate, the excitant comprises lithium silicate, and the internal curing agent comprises zeolite powder. The accelerator, the excitant and the internal curing agent are matched, so that the accelerator, the excitant and the internal curing agent have the effects of shortening the setting time and improving the early concrete strength, simultaneously the curing is simple, a high-humidity environment is not needed, the setting time only needs 4 hours, the 3d strength reaches 20Mpa, and the 28d strength reaches more than 45 Mpa.

Description

Industrial gypsum-based ready-mixed mortar and preparation method thereof
Technical Field
The invention relates to the technical field of concrete, in particular to industrial gypsum-based ready-mixed mortar and a preparation method thereof.
Background
In the phosphorus chemical industry, about 3-5 tons of phosphogypsum is produced per 1 ton of phosphoric acid, and the desulfurized gypsum is a byproduct of desulfurization of a fire coal flue of a thermal power plant, and is newly increased by hundreds of millions of tons each year. At present, phosphogypsum and desulfurized gypsum are low in overall utilization rate, are mainly used as cement setting regulators or used as gypsum building materials and roadbed materials, and are less in research on the application of industrial gypsum to produce ready-mixed mortar and ready-mixed concrete, because phosphogypsum and desulfurized gypsum are high-water-content wet-sticky materials, and the problems of difficult discharging and difficult dispersion exist in the application of phosphogypsum and desulfurized gypsum in a concrete production system.
Industrial gypsum is used in the field of ready-mixed mortar, and is mainly calcined into semi-hydrated gypsum, so that gypsum mortar is prepared. The firing of semi-hydrated gypsum consumes a large amount of energy and has low utilization efficiency. The oversulfur cement is a cementing material with mineral powder and gypsum as main components, and is characterized by green environmental protection, and can be widely used as-is industrial gypsum, but the early strength is low, and the development of the later strength is particularly dependent on moisture. When the mortar is applied to ready-mixed mortar, the early strength of the surface of the mortar is low, so that the mortar is subjected to powder dropping; meanwhile, the mortar can rapidly lose water to cause the influence on the later hydration of the cementing material, so that the strength development is slower.
The invention patent No. CN103253916A discloses an early strength agent for improving the strength of phosphogypsum-based cement concrete, which has higher requirements on curing after being used for phosphogypsum-based cement, needs curing at 20+/-2 ℃ and humidity above 90%, and has longer final setting time.
Disclosure of Invention
In view of the above, the invention provides an industrial gypsum-based ready-mixed mortar with low curing requirements, short setting time and high early strength and a preparation method thereof.
The technical scheme of the invention is realized as follows: in one aspect, the invention provides industrial gypsum-based ready-mixed mortar, which comprises industrial gypsum, mineral powder, cement, machine-made sand, a setting accelerator, an exciting agent, an internal curing agent, an air entraining agent, a water reducing agent and water;
the accelerator comprises one or two of polymeric ferric sulfate silicate and polymeric ferric aluminum silicate, the excitant comprises lithium silicate, and the internal curing agent comprises zeolite powder.
On the basis of the technical scheme, preferably, the ready-mixed mortar comprises, by weight, 100-140 parts of industrial gypsum, 80-100 parts of mineral powder, 4-10 parts of cement, 800-1200 parts of machine-made sand, 1-2 parts of a setting accelerator, 6-10 parts of an exciting agent, 20-30 parts of an internal curing agent, 0.05-0.1 part of an air entraining agent, 0.05-0.1 part of a water reducer and 160-200 parts of water.
On the basis of the technical scheme, the thickener is preferably 0.1-0.2 weight part.
On the basis of the technical scheme, preferably, the thickening agent is one or a combination of more of sodium alginate, chitosan and sodium gluconate.
On the basis of the above technical solution, preferably, the industrial gypsum includes one or both of phosphogypsum and desulfurized gypsum.
On the basis of the technical scheme, the fineness modulus of the machine-made sand is preferably 2.5-2.9 mm.
On the basis of the technical scheme, preferably, the air entraining agent is one or two of sodium alkenyl sulfonate and sodium dodecyl sulfate.
On the basis of the technical scheme, preferably, the water reducer is a naphthalene water reducer.
On the other hand, the invention provides a preparation method of industrial gypsum-based ready-mixed mortar, which comprises the following steps: mixing industrial gypsum, mineral powder, cement, machine-made sand and an internal curing agent, stirring for 60-90 s, adding a coagulant, an exciting agent, a thickening agent, an air entraining agent, a water reducing agent and water, stirring for 3-5 min, grouting, vibrating and molding, demolding after molding for 48h, and placing into a mortar dry curing room for curing.
On the basis of the technical scheme, the curing temperature is preferably 20-30 ℃ and the humidity is 40-60%.
Compared with the prior art, the industrial gypsum-based ready-mixed mortar and the preparation method thereof have the following beneficial effects:
(1) Free phosphate radical and fluoride ion in phosphogypsum are easy to form precipitate, and are adsorbed on the surface of hydration product to prevent further hydration, so that the phosphogypsum has strong retarding effect. The polymeric ferric sulfate silicate and the polymeric ferric aluminum silicate coagulant can well adsorb free phosphate radical and fluoride ions in the original phosphogypsum after being dissolved in water to form agglomerated sediment, thereby eliminating the influence of the phosphate radical and the fluoride ions on the hydration of mortar. Further, a large amount of free water is adsorbed in the flocculus formed by the polymeric ferric sulfate silicate and the polymeric ferric aluminum silicate coagulant, and the functions of water retention and internal maintenance can be achieved in the later stage of mortar hydration. The lithium ions in the lithium silicate have good excitation and early strength effects, promote the hydration of slag, ensure the surface hardness of mortar, simultaneously, the silicate ions and the calcium ions can rapidly generate calcium silicate gel, and also promote the strength development of the mortar. Furthermore, the lithium silicate can form a layer of hardening film on the surface of the mortar, so that on one hand, the hardness of the surface of the mortar can be obviously improved, on the other hand, the loss of water in the mortar can be prevented, and the further development of the strength of the mortar is facilitated. The silica and alumina in the zeolite powder can be used for generating calcium silicate gel and calcium aluminate gel with calcium ions in industrial gypsum, so that the strength of the gypsum-based concrete is improved. The combination of the polymeric ferric sulfate silicate, the polymeric ferric aluminum silicate, the lithium silicate and the zeolite powder has the effects of shortening the setting time and improving the early concrete strength, and meanwhile, the curing is simple and high-humidity environment is not needed.
(2) The sodium alginate, chitosan and sodium gluconate thickener have the functions of increasing the consistency, improving the water retention rate and slowing down the water loss, and meanwhile, the sodium alginate, chitosan and sodium gluconate thickener can carry out hydrolysis reaction with the water on the surface and in the gypsum to reduce the water content in the gypsum, and meanwhile, the sodium alginate, chitosan and sodium gluconate are combined with calcium ions in the gypsum to form a reticular structure to increase the strength of the gypsum-based concrete. (3) The setting time of the industrial gypsum-based ready-mixed mortar only needs 4 hours, the strength of 3d reaches 20Mpa, and the strength of 28d reaches more than 45 Mpa.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
The naphthalene water reducer used in the invention is FDN-C, and is purchased from Hubei Xinyu macro biological medicine technology Co.
Example 1
The industrial gypsum-based ready mixed mortar of the embodiment comprises 100kg of phosphogypsum, 80kg of mineral powder, 4kg of cement, 800kg of machine-made sand, 1kg of polymeric ferric sulfate silicate, 6kg of lithium silicate, 20kg of zeolite powder, 0.05kg of sodium alkenyl sulfonate, 0.05kg of a naphthalene water reducer and 160kg of water.
The preparation method of the industrial gypsum-based ready-mixed mortar comprises the following steps: mixing phosphogypsum, mineral powder, cement, machine-made sand and zeolite powder, stirring for 60s, adding polymeric ferric silicate sulfate, lithium silicate, sodium alkenyl sulfonate, a naphthalene water reducer and water, stirring for 3min, grouting, vibrating and molding, demolding after molding for 48h, placing into a mortar dry curing chamber, and curing under the conditions that the temperature is 20 ℃ and the humidity is 40%.
Example 2
The industrial gypsum-based ready mixed mortar of the embodiment comprises 140kg of phosphogypsum, 100kg of mineral powder, 10kg of cement, 1200kg of machine-made sand, 2kg of polymeric ferric sulfate silicate, 10kg of lithium silicate, 30kg of zeolite powder, 0.1kg of sodium alkenyl sulfonate, 0.1kg of a naphthalene water reducer and 200kg of water.
The preparation method of the industrial gypsum-based ready-mixed mortar comprises the following steps: mixing phosphogypsum, mineral powder, cement, machine-made sand and zeolite powder, stirring for 90s, adding polymeric ferric silicate sulfate, lithium silicate, sodium alkenyl sulfonate, a naphthalene water reducer and water, stirring for 5min, grouting, vibrating and molding, demolding after molding for 48h, placing into a mortar dry curing chamber, and curing under the conditions that the temperature is 30 ℃ and the humidity is 60%.
Example 3
The industrial gypsum-based ready mixed mortar of this example comprises 120kg of desulfurized gypsum, 90kg of mineral powder, 7kg of cement, 1000kg of machine-made sand, 1.5kg of polyaluminum silicate, 8kg of lithium silicate, 25kg of zeolite powder, 0.075kg of sodium dodecyl sulfate, 0.075kg of a naphthalene series water reducer and 180kg of water.
The preparation method of the industrial gypsum-based ready-mixed mortar comprises the following steps: mixing desulfurized gypsum, mineral powder, cement, machine-made sand and zeolite powder, stirring for 75 seconds, then adding polymeric ferric aluminum silicate, lithium silicate, sodium dodecyl sulfate, a naphthalene water reducer and water, continuously stirring for 4 minutes, grouting, vibrating and forming, demoulding after forming for 48 hours, putting into a mortar dry curing chamber, and curing under the conditions that the temperature is 25 ℃ and the humidity is 50%.
Example 4
The industrial gypsum-based ready mixed mortar of the embodiment comprises 100kg of phosphogypsum, 80kg of mineral powder, 4kg of cement, 800kg of machine-made sand, 1kg of polymeric ferric sulfate silicate, 6kg of lithium silicate, 20kg of zeolite powder, 0.1kg of sodium alginate, 0.05kg of sodium alkenyl sulfonate, 0.05kg of a naphthalene water reducer and 160kg of water.
The preparation method of the industrial gypsum-based ready-mixed mortar comprises the following steps: mixing phosphogypsum, mineral powder, cement, machine-made sand and zeolite powder, stirring for 60s, adding polymeric ferric silicate sulfate, lithium silicate, sodium alginate, sodium alkenyl sulfonate, a naphthalene water reducer and water, stirring for 3min, grouting, vibrating and molding, demolding after molding for 48h, placing into a mortar dry curing chamber, and curing under the conditions that the temperature is 20 ℃ and the humidity is 40%.
Example 5
The industrial gypsum-based ready-mixed mortar of the embodiment comprises 40kg of phosphogypsum, 70kg of desulfurized gypsum, 85kg of mineral powder, 6kg of cement, 900kg of machine-made sand with the fineness modulus of 2.5-2.9 mm, 1.4kg of polyaluminium ferric silicate, 7kg of lithium silicate, 24kg of zeolite powder, 0.14kg of chitosan, 0.06kg of sodium alkenyl sulfonate, 0.06kg of a naphthalene water reducer and 170kg of water.
The preparation method of the industrial gypsum-based ready-mixed mortar comprises the following steps: mixing phosphogypsum, desulfurized gypsum, mineral powder, cement, machine-made sand and zeolite powder, stirring for 65s, adding polymeric ferric aluminum silicate, lithium silicate, chitosan, sodium alkenyl sulfonate, a naphthalene water reducer and water, stirring for 3min, grouting, vibrating and molding, demolding after molding for 48h, placing into a mortar dry curing chamber, and curing under the conditions that the temperature is 24 ℃ and the humidity is 50%.
Example 6
The industrial gypsum-based ready-mixed mortar of the embodiment comprises 70kg of phosphogypsum and 60kg of desulfurized gypsum, 95kg of mineral powder, 8kg of cement, 1100kg of machine-made sand with the fineness modulus of 2.5-2.9 mm, 1.6kg of polymeric ferric sulfate silicate, 9kg of lithium silicate, 26kg of zeolite powder, 0.16kg of sodium gluconate, 0.08kg of sodium dodecyl sulfate, 0.08kg of a naphthalene water reducer and 190kg of water.
The preparation method of the industrial gypsum-based ready-mixed mortar comprises the following steps: mixing phosphogypsum, desulfurized gypsum, mineral powder, cement, machine-made sand and zeolite powder, stirring for 80 seconds, then adding polymeric ferric sulfate silicate, lithium silicate, sodium gluconate, sodium dodecyl sulfate air entraining agent, naphthalene water reducer and water, stirring for 5 minutes, grouting, vibrating and molding, demolding after molding for 48 hours, putting into a mortar dry curing chamber, and curing under the conditions that the temperature is 30 ℃ and the humidity is 50%.
Comparative example 1
Comparative example 1 differs from example 1 by the absence of a setting accelerator.
Comparative example 2
Comparative example 2 differs from example 1 by the lack of an activator.
Comparative example 3
Comparative example 3 differs from example 1 by the lack of internal curing agent.
Comparative example 4
Comparative example 4 differs from example 1 in that the activator was 14kg.
Comparative example 5
Comparative example 5 differs from example 1 in that the zeolite powder was 40kg.
Comparative example 6
Comparative example 6 differs from example 1 in that the accelerator was 0.2kg.
Comparative example 7
Comparative example 7 differs from example 4 in that sodium alginate is 2kg.
The concrete obtained by the preparation method of the industrial gypsum-based ready mixed mortar in the examples and comparative examples was subjected to performance test and compressive strength with reference to the following methods: standard test blocks were prepared according to the method in GB/T50081-2002 Standard test method for mechanical Properties of general concrete, and the compressive strengths of the standard test blocks were measured for curing 3d and 28d, and the results are shown in Table 1.
Table 1 properties of the examples and comparative examples concretes
As can be seen from Table 1, the concrete obtained by the preparation method of the industrial gypsum-based ready mixed mortar provided by the embodiment of the invention has the advantages that the final setting time is up to 4 hours, the strength of the concrete can reach 20Mpa during curing for 3d, the surface of the concrete is normal under the dry curing condition, the powder is not raised, the alkali is not turned into the form, and the strength of the concrete can reach more than 45Mpa during curing for 28 d. In the absence of the accelerator, the activator and the internal curing agent, the setting time and the strength of the concrete are reduced, and the surface is powderized and alkali-turned, thereby verifying the technical effects of the accelerator, the activator and the internal curing agent.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. An industrial gypsum-based ready mixed mortar, which is characterized in that: comprises industrial gypsum, mineral powder, cement, machine-made sand, a coagulant, an exciting agent, an internal curing agent, an air entraining agent, a water reducing agent and water;
the accelerator comprises one or two of polymeric ferric sulfate silicate and polymeric ferric aluminum silicate, the excitant comprises lithium silicate, and the internal curing agent comprises zeolite powder.
2. An industrial gypsum-based ready mixed mortar according to claim 1 wherein: the ready-mixed mortar comprises, by weight, 100-140 parts of industrial gypsum, 80-100 parts of mineral powder, 4-10 parts of cement, 800-1200 parts of machine-made sand, 1-2 parts of a coagulant, 6-10 parts of an excitant, 20-30 parts of an internal curing agent, 0.05-0.1 part of an air entraining agent, 0.05-0.1 part of a water reducer and 160-200 parts of water.
3. An industrial gypsum-based ready mixed mortar according to claim 2 wherein: also comprises 0.1 to 0.2 weight parts of thickener.
4. An industrial gypsum-based ready mixed mortar as set forth in claim 3, wherein: the thickener is one or a combination of more of sodium alginate, chitosan and sodium gluconate.
5. An industrial gypsum-based ready mixed mortar according to claim 1 wherein: the industrial gypsum is one or two of phosphogypsum and desulfurized gypsum.
6. An industrial gypsum-based ready mixed mortar according to claim 1 wherein: the fineness modulus of the machine-made sand is 2.5-2.9 mm.
7. An industrial gypsum-based ready mixed mortar according to claim 1 wherein: the air entraining agent is one or two of sodium alkenyl sulfonate and sodium dodecyl sulfate.
8. An industrial gypsum-based ready mixed mortar according to claim 1 wherein: the water reducer is a naphthalene water reducer.
9. A method for preparing industrial gypsum-based ready mixed mortar according to claim 3, wherein:
the method comprises the following steps: mixing industrial gypsum, mineral powder, cement, machine-made sand and an internal curing agent, stirring for 60-90 s, adding a coagulant, an exciting agent, a thickening agent, an air entraining agent, a water reducing agent and water, stirring for 3-5 min, grouting, vibrating and molding, demolding after molding for 48h, and placing into a mortar dry curing room for curing.
10. The method for preparing industrial gypsum-based ready mixed mortar according to claim 9, wherein:
the curing temperature is 20-30 ℃ and the humidity is 40-60%.
CN202310606472.0A 2023-05-26 2023-05-26 Industrial gypsum-based ready-mixed mortar and preparation method thereof Pending CN116535189A (en)

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