CN107892541B - Gypsum slurry for building block strength test and preparation method thereof - Google Patents
Gypsum slurry for building block strength test and preparation method thereof Download PDFInfo
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- CN107892541B CN107892541B CN201711309587.4A CN201711309587A CN107892541B CN 107892541 B CN107892541 B CN 107892541B CN 201711309587 A CN201711309587 A CN 201711309587A CN 107892541 B CN107892541 B CN 107892541B
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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
- C04B28/14—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 calcium sulfate 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
- 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
- C04B14/06—Quartz; Sand
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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
- 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
- C04B14/06—Quartz; Sand
- C04B14/068—Specific natural sands, e.g. sea -, beach -, dune - or desert sand
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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
Abstract
A gypsum slurry for building block strength test is prepared by mixing and stirring a cementing material high-strength gypsum powder, a common gypsum powder, common fine sand, artificial sand and a retarder according to a proportion, wherein the weight ratio of the used raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder =100: 3-4: 58-63: 5.9-11: 1.5-2.0. The physical property and the mechanical property of the material meet the standard requirements, and the preparation method is simple and easy to implement, has low cost and can be widely popularized and applied.
Description
Technical Field
The invention relates to gypsum slurry, in particular to gypsum slurry for a building block strength test, and belongs to the technical field of building materials.
Background
The building block is a block-shaped building material used in construction engineering and is divided into a main block type block, an auxiliary block, a right-angled hexahedron block and a special-shaped block, is commonly used for wall masonry, hydraulic slope protection, terrace, flower wall, dry barrier wall and the like of the construction engineering, and plays a role in bearing and retaining. The strength of the block is a main technical index of the performance of the block, whether the strength can meet the index requirement or not is directly related to the quality of the whole project, and the leveling material is generally adopted to level or bond the pressed surface and the connecting surface in the actual work of the strength test of the building block because the surface is uneven and the height of a test piece does not meet the requirement. The gypsum slurry plays a leveling and bonding role in the strength detection of the block, the application technology is mature, and the gypsum slurry is more and more commonly used.
The inventors searched the following patent documents: CN107082618A discloses a dispersant-containing gypsum slurry containing a phosphate-based polycondensate as the only agent having dispersing properties. Compared to the polycondensates known from the prior art, it has been found that the efficiency of using the phosphated polycondensate of the gypsum slurry as sole dispersing component is improved. An additional advantageous effect is observed compared to other dispersants, which is independent of the dosage of the dispersing component, significantly reducing the retardation of setting and hardening of various building compositions, especially gypsum-based slurries. This effect of the polycondensate component and the advantageous effect on the pore structure can be found unexpectedly. CN103154128A discloses a dispersant-containing gypsum slurry containing a phosphate-based polycondensate as the only agent having dispersing properties. Compared to the polycondensates known from the prior art, it has been found that the efficiency of using the phosphated polycondensate of the gypsum slurry as sole dispersing component is improved. An additional advantageous effect is observed compared to other dispersants-a significant reduction in the retardation of setting and hardening of various building compositions, especially gypsum-based slurries-independent of the dosage of the dispersing component. This effect of the polycondensate component and the advantageous effect on the pore structure can be found unexpectedly. CN1785882A discloses a high-solid content gypsum slurry and a preparation method thereof. The high solid content gypsum slurry has solid content of 30-80%, particle size less than 2 microns accounting for over 30% of the total particle size, and viscosity less than 1000 centipoises. Also disclosed is a method for preparing two dispersants for dispersing a high solids gypsum slurry. The invented high-solid content gypsum slurry is mainly used for filling and coating paper.
The technology has the advantages that the preparation method is simple and easy, the cost is low, the gypsum slurry can be widely popularized and applied, and no specific guidance scheme is given for how to enable the physical property and the mechanical property of the gypsum slurry to meet the standard requirements.
Disclosure of Invention
The invention aims to solve the technical problems that the gypsum slurry for the building block strength test is provided, the physical property and the mechanical property of the gypsum slurry meet the standard requirements of the specification, the setting is fast, the time is short, and the maintenance age is obviously shortened, so that the detection time is shortened, and the detection efficiency is improved; meanwhile, the preparation method is simple and easy to implement, has low cost and can be widely popularized and applied.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the gypsum slurry for the strength test of building blocks is prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder according to a proportion, wherein the high-strength gypsum powder has the compressive strength of more than or equal to 24.0MPa for 2 hours; the common gypsum powder is grade 3, and the 2h compressive strength is more than or equal to 5.0 MPa; the common fine sand adopts fine sand with the fineness modulus of 1.6-2.1, and the mud content is less than or equal to 0.50%; the water absorption rate is 2-3%; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm, the stone powder content less than or equal to 5 percent and the water absorption rate of 8-10 percent; the retarder is one or a combination of citric acid, citric acid trinsodium and polyphosphate; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100: 3-4: 58-63: 5.9-11: 1.5-2.0.
In the above technical solution, a preferred embodiment of the present invention may be: the gypsum slurry for the building block strength test can be prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder in proportion, wherein the high-strength gypsum powder has the 2-hour compressive strength of 24.0-35.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 5.0-8.0 MPa; the common fine sand adopts fine sand with the fineness modulus of 1.6-2.1, and the mud content is less than or equal to 0.50%; the water absorption rate is 2-3%; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm, the stone powder content less than or equal to 5 percent and the water absorption rate of 8-10 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100: 3.5-4: 60-63: 5.9-9: 1.5-1.8.
The gypsum slurry for the building block strength test can also be prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder according to a proportion, wherein the high-strength gypsum powder has a 2h compressive strength of 30.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 8.0 MPa; the common fine sand adopts fine sand with fineness modulus of 1.8-2.1, the mud content is less than or equal to 0.50% when the fineness modulus is 0, and the water absorption rate is 2.5-3%; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm and stone powder content less than or equal to 5 percent at 0 percent, and the water absorption rate is 8.5 to 10 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100: 3.5-4: 60-63: 5.9-9: 1.5-1.8 (100: 3.8:60:9:1.6 can be selected).
The gypsum slurry for the building block strength test can also be prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder according to a proportion, wherein the high-strength gypsum powder has the 2h compressive strength of 35.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 6.0 MPa; the common fine sand adopts fine sand with fineness modulus of 1.6-1.8, the mud content is less than or equal to 0.50%, and the water absorption rate is 2.5-3%; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm, the stone powder content less than or equal to 5 percent and the water absorption of 9-10 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100: 3.5-3.8: 60-62: 5.9-10: 1.5-1.8 (100: 3.6:62:7:1.8 can be selected).
The gypsum slurry for the building block strength test can also be prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder according to a proportion, wherein the high-strength gypsum powder has a 2h compressive strength of 30.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 8.0 MPa; the common fine sand adopts fine sand with fineness modulus of 2.0, the mud content is 0.30 percent, and the water absorption rate is 3 percent; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm, the stone powder content of 3.5 percent and the water absorption of 10 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100:3.7:62:8: 1.8.
The gypsum slurry for the building block strength test can also be prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder according to a proportion, wherein the high-strength gypsum powder has the 2h compressive strength of 35.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 6.0 MPa; the common fine sand adopts fine sand with fineness modulus of 2.0, the mud content is 0.30-0.50%, and the water absorption rate is 2%; the artificial sand is machine-made sand with the particle size of 0.5-1 mm, the stone powder content of 3% -3.5% and the water absorption of 10%; the retarder is a combination of trinsodium citrate and polyphosphate, and the weight ratio of trinsodium citrate to polyphosphate is 1.5: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100:3.9:63:8: 1.7. The polyphosphate is preferably sodium polyphosphate.
The following are the raw materials selected for the gypsum slurry of the present invention:
(1) gypsum powder: the oxygen content (mass fraction) is 45.0-53.0%, the calcium content (mass fraction) is 25.0-33.0%, and the sulfur content (mass fraction) is 19.0-27.0%; the 2h compressive strength is more than 22.0MPa (24-25% of water consumption); the screen allowance of the 0.1mm square hole screen is less than 5 percent. According to the above requirements and hemihydrate gypsum (CaSO)4·1/2H2O), high-strength gypsum powder with a gypsum content of 90% or more must be selected. The screen allowance of the screen passing through the 0.1mm square hole screen is less than 5 percent; considering that the 4-hour compressive strength of the gypsum slurry for the building block strength test meets 19-21MPa (24% -26% of water consumption), the strength and the fluidity of the single high-strength gypsum are not easy to meet the requirements, two high-strength gypsum and two common gypsum are respectively selected to be matched for use, and the high-strength gypsum I (the technical properties are that the fineness is 4.1%, the initial setting time is 11min, the final setting time is 22min, the 2-hour flexural strength is 18.6MPa, and the compressive strength is 30.0 MPa); high-strength gypsum II (technical performance: fineness: 3.8%, initial setting time: 10min, final setting time: 21min, 2h flexural strength of 21.8MPa, compressive strength of 35.0 MPa); common gypsum I (technical performance: fineness: 3.6%, initial setting time: 15min, final setting time: 27min, 2h flexural strength of 4.6MPa, compressive strength of 8.0 MPa); common gypsum II (technical performance: fineness: 4.2%, initial setting time: 13min, final setting time: 28min, 2h flexural strength of 3.8MPa, compressive strength of 6.0 MPa).
(2) Fine aggregate: the content (mass fraction) of silicon dioxide is required to be 61-67%, and the ignition loss should not exceed 1%; the grain diameter is less than (or equal to) 1mm, and the mud content should not exceed 0.50%. According to the above requirements and considering that the aggregate does not contain substances which can cause harmful influence on the surface and strength performance of the block, clean river sand is selected, the mud content is measured to be not more than 0.50%, and the sand is sieved by a 1mm square hole sieve. In the test process, the performance indexes of the local river sand can meet the requirements, but the water absorption of all the river sand is small, and the excessive water content in the slurry cannot be adjusted, so that the fluidity of the slurry cannot be controlled. Therefore, artificial sand is selected for carrying out an adjustment test, and a satisfactory water absorption rate is obtained. Through a plurality of tests, river sand is selected as the main material, and a small amount of artificial sand is doped as the fine aggregate of the gypsum slurry. The common sand adopts fine sand with fineness modulus of 1.6-2.1, the mud content is not more than 0.50%, and the water absorption rate is 3%; the artificial sand is machine-made sand with the grain diameter less than (or equal to) 1mm, the stone powder content less than or equal to 5 percent and the water absorption rate of 10 percent.
(3) Other materials: the test also selects a retarder for adjusting the setting time, the retarder preferably selects citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1.
the gypsum slurry for the building block strength test is prepared by adjusting the gypsum strength and the fluidity by using high-strength gypsum powder and common gypsum, selecting common fine sand meeting requirements, adjusting the water consumption by using the common fine sand and artificial sand, adjusting the setting time by using a retarder, and further optimizing various performance indexes of the gypsum slurry for the building block strength test according to the gypsum strength, the setting time, the fineness and the mud content of the common (fine) sand, the fineness of the artificial sand, the stone powder content and other technical indexes to obtain the mix proportion of the gypsum slurry for the building block strength test. According to the invention, the gypsum slurry for the building block strength test is prepared from high-strength gypsum powder, common gypsum, common fine sand, artificial sand and a retarder through a large amount of test data, so that the standard requirement of 'clean slurry material for the compression strength test of GB/T25183-2010 wall building bricks' is met, and the cost of the gypsum slurry for the building block strength test is greatly reduced.
The gypsum slurry for the building block strength test meets the standard requirements of clean slurry material for GB/T25183-2010 wall brick compressive strength test, and the 4h (wet) compressive strength is as follows: 19-21 MPa; fluidity 160-: 15-19 min; final setting time: less than 30 min. The invention develops a gypsum slurry product for a building block strength test, economically and reasonably selects raw materials through the research on the preparation technology of the gypsum slurry, and reduces the manufacturing cost of the gypsum slurry. The invention has the advantages of rapid setting and short time, and compared with the traditional cement paste and cement mortar, the curing age of the invention is obviously shortened, the detection time is greatly reduced (the detection time is reduced by more than 30 percent), and the detection efficiency is improved (the detection efficiency is improved by more than 35 percent).
The invention utilizes high-strength gypsum powder to add common gypsum powder to adjust the overall strength, and adds artificial sand to common fine sand to adjust the water consumption. The physical property and the mechanical property of the material meet the standard requirements, and the preparation method is simple and easy to implement, has low cost and can be widely popularized and applied.
Detailed Description
Example 1 the gypsum slurry for the building block strength test of the invention is prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder according to a proportion, wherein the high-strength gypsum powder has a compressive strength of 30.0MPa for 2 hours; the common gypsum powder is grade 3, and the 2h compressive strength is 8.0 MPa; the common fine sand adopts fine sand with the fineness modulus of 1.8-2.1, and the mud content is less than or equal to 0.50%; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm and the stone powder content less than or equal to 5 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100: 3.5-4: 60-63: 5.9-9: 1.5-1.8 (high-strength gypsum powder, common fine sand and artificial sand are selected, and the retarder is 100:3.8:60:9: 1.6).
The preparation method (namely the preparation method) of the gypsum slurry for the building block strength test is that the gypsum slurry is prepared by mixing and stirring high-strength gypsum powder, common fine sand, artificial sand and a retarder according to the proportion (putting the mixture into a stirrer).
The technical performance of the prepared gypsum slurry is as follows: 4h compressive strength: 20.1 MPa; fluidity 162mm, initial setting time: 18 min; final setting time: and (8) the time is 26 min.
Example 2, the gypsum slurry for the building block strength test of the present invention is prepared by mixing and stirring a cementitious material, high-strength gypsum powder, ordinary fine sand, artificial sand, and a retarder in proportion, wherein the high-strength gypsum powder has a 2h compressive strength of 35.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 6.0 MPa; the common fine sand adopts fine sand with the fineness modulus of 1.6-1.8, and the mud content is less than or equal to 0.50%; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm and the stone powder content less than or equal to 5 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100: 3.5-4: 60-63: 5.9-9: 1.5-1.8 (high-strength gypsum powder, common fine sand and artificial sand are selected, and the retarder is 100:3.6:62:7: 1.8).
The technical performance of the prepared gypsum slurry is as follows: 4h compressive strength: 20.6 MPa; fluidity 161mm, initial setting time: 16 min; final setting time: and (4) 23 min.
Example 3, the gypsum slurry for the building block strength test of the present invention is prepared by mixing and stirring high strength gypsum powder, common fine sand, artificial sand, and a retarder in proportion, wherein the high strength gypsum powder has a 2h compressive strength of 30.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 8.0 MPa; the common fine sand adopts fine sand with fineness modulus of 2.0, and the mud content is 0.30%; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm (0.3-1 mm is selected) and the content of stone powder is 3.5 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100:3.7:62:8: 1.8.
The technical performance of the prepared gypsum slurry is as follows: 4h compressive strength: 20.7 MPa; fluidity 161mm, initial setting time: 15 min; final setting time: and (4) 23 min.
Example 4 the gypsum slurry for the building block strength test of the present invention is prepared by mixing and stirring a cementitious material, high-strength gypsum powder, ordinary fine sand, artificial sand, and a retarder in proportion, wherein the high-strength gypsum powder has a 2-hour compressive strength of 35.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 6.0 MPa; the common fine sand adopts fine sand with fineness modulus of 2.0, and the mud content is 0.30-0.50%; the artificial sand adopts machine-made sand with the grain diameter of 0.5-1 mm and the stone powder content of 3% -3.5%; the retarder is a combination of trinsodium citrate and polyphosphate, and the weight ratio of trinsodium citrate to polyphosphate is 1.5: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100:3.9:63:8: 1.7.
The technical performance of the prepared gypsum slurry is as follows: 4h compressive strength: 20.2 MPa; fluidity 162mm, initial setting time: 17 min; final setting time: and (5) 25 min.
The polyphosphate in each of the above examples was sodium polyphosphate.
The gypsum slurry for the building block strength test prepared in the above embodiments of the invention meets the standard requirements of clean slurry material for the GB/T25183-2010 wall brick compressive strength test, and has a compressive strength of 4 h: 19-21 MPa; fluidity 160-: 15-19 min; final setting time: less than 30 min. The invention develops a gypsum slurry product for a building block strength test, economically and reasonably selects raw materials through the research on the preparation technology of the gypsum slurry, and reduces the manufacturing cost of the gypsum slurry. The invention has the advantages of rapid setting and short time, and compared with the traditional cement paste and cement mortar, the curing age of the invention is obviously shortened, the detection time is greatly reduced (the detection time is reduced by more than 30 percent), and the detection efficiency is improved (the detection efficiency is improved by more than 35 percent).
The invention utilizes high-strength gypsum powder to add common gypsum powder to adjust the overall strength, and adds artificial sand to common fine sand to adjust the water consumption. The physical property and the mechanical property of the material meet the standard requirements, and the preparation method is simple and easy to implement, has low cost and can be widely popularized and applied.
Claims (9)
1. The gypsum slurry for the building block strength test is characterized by being prepared by mixing and stirring a cementing material high-strength gypsum powder, a common gypsum powder, common fine sand, artificial sand and a retarder according to a proportion, wherein the high-strength gypsum powder has a compressive strength of more than or equal to 24.0MPa for 2 hours; the common gypsum powder is grade 3, and the 2h compressive strength is more than or equal to 5.0 MPa; the common fine sand adopts fine sand with fineness modulus of 1.6-2.1, the mud content is less than or equal to 0.50%, and the water absorption rate is 2-3%; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm, the stone powder content less than or equal to 5 percent and the water absorption rate of 8-10 percent; the retarder is one or more of citric acid, citric acid trinsodium and polyphosphate; the weight ratio of the raw materials is as follows:
high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100: 3-4: 58-63: 5.9-11: 1.5-2.0.
2. The gypsum slurry for the building block material strength test according to claim 1, which is prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder in proportion, wherein the high-strength gypsum powder has a compressive strength of 24.0-35.0 MPa for 2 hours; the common gypsum powder is grade 3, and the 2h compressive strength is 5.0-8.0 MPa; the common fine sand adopts fine sand with fineness modulus of 1.6-2.1, the mud content is less than or equal to 0.50%, and the water absorption rate is 2-3%; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm, the stone powder content less than or equal to 5 percent and the water absorption rate of 8-10 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows:
high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100: 3.5-4: 60-63: 5.9-9: 1.5-1.8.
3. The gypsum slurry for the building block material strength test according to claim 1, which is prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder in proportion, wherein the high-strength gypsum powder has a 2-hour compressive strength of 30.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 8.0 MPa; the common fine sand adopts fine sand with the fineness modulus of 1.8-2.1, and the mud content is less than or equal to 0.50%; the water absorption rate is 2.5-3%; the artificial sand adopts machine-made sand with the grain diameter less than or equal to 1mm, the stone powder content less than or equal to 5 percent and the water absorption rate of 8.5-10 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows:
high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100: 3.5-4: 60-63: 5.9-9: 1.5-1.8.
4. The gypsum slurry for the building block material strength test according to claim 1, which is prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder in proportion, wherein the high-strength gypsum powder has a 2-hour compressive strength of 35.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 6.0 MPa; the common fine sand adopts fine sand with the fineness modulus of 1.6-1.8, and the mud content is less than or equal to 0.50%; the water absorption rate is 2.5-3%; the artificial sand is machine-made sand with the grain diameter less than or equal to 1mm, the stone powder content less than or equal to 5 percent and the water absorption of 9-10 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows:
high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100: 3.5-3.8: 60-62: 5.9-10: 1.5-1.8.
5. The gypsum slurry for the building block material strength test according to claim 1, which is prepared by mixing and stirring high-strength gypsum powder, common fine sand, artificial sand and a retarder according to a proportion, wherein the high-strength gypsum powder has a 2-hour compressive strength of 30.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 8.0 MPa; the common fine sand adopts fine sand with fineness modulus of 2.0, and the mud content is 0.30%; the water absorption rate is 3 percent; the artificial sand adopts machine-made sand with the particle size of less than or equal to 1mm, the stone powder content of less than or equal to 5 percent and the water absorption of 10 percent, and the artificial sand adopts machine-made sand with the particle size of less than or equal to 1mm and the stone powder content of 3.5 percent; the retarder is a combination of citric acid, trinsodium citrate and polyphosphate, and the weight ratio of the citric acid to the trinsodium citrate to the polyphosphate is 1:2: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100:3.7:62:8: 1.8.
6. The gypsum slurry for the building block material strength test according to claim 1, which is prepared by mixing and stirring a cementing material, namely high-strength gypsum powder, common fine sand, artificial sand and a retarder in proportion, wherein the high-strength gypsum powder has a 2-hour compressive strength of 35.0 MPa; the common gypsum powder is grade 3, and the 2h compressive strength is 6.0 MPa; the common fine sand adopts fine sand with fineness modulus of 2.0, and the mud content is 0.30-0.50%; the water absorption rate is 2 percent; the artificial sand is machine-made sand with the particle size of less than or equal to 1mm, the stone powder content of less than or equal to 5 percent and the water absorption of 10 percent; the retarder is a combination of trinsodium citrate and polyphosphate, and the weight ratio of trinsodium citrate to polyphosphate is 1.5: 1; the weight ratio of the raw materials is as follows: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100:3.9:63:8: 1.7.
7. The gypsum slurry for the strength test of the building block material as claimed in claim 2, wherein the raw materials in weight ratio are: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100:3.8:60:9: 1.6.
8. The gypsum slurry for the strength test of the building blocks as claimed in claim 3, wherein the raw materials in weight ratio are: high-strength gypsum powder: common gypsum powder: ordinary fine sand: artificial sand: the retarder is 100:3.6:62:7: 1.8.
9. The gypsum slurry for strength testing of building blocks of claim 1, wherein said polyphosphate is sodium polyphosphate.
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