CN107140926B - Gypsum-based steel structure fireproof protection material - Google Patents
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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
- C04B28/142—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 containing synthetic or waste calcium sulfate cements
- C04B28/144—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 containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00525—Coating or impregnation materials for metallic surfaces
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00577—Coating or impregnation materials applied by spraying
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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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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Abstract
The invention provides a gypsum-based steel structure fireproof protection material which is prepared by mixing the following components in percentage by mass: 84 to 95 percent of desulfurized gypsum, 3 to 15.5 percent of light heat insulating material, 0.1 to 0.5 percent of water-retaining agent, 0.1 to 1 percent of redispersible latex powder, 0.1 to 0.5 percent of retarder and 0.01 to 0.1 percent of air entraining agent; the light heat-insulating material is vitrified micro-beads, closed-cell expanded perlite, expanded vermiculite, sepiolite or flaky mica. The gypsum-based steel structure fireproof protection material has excellent fireproof and heat-insulating properties, and realizes social and economic benefits through waste utilization.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a gypsum-based steel structure fireproof protection material.
Background
With the continuous development of economy in China, steel structures are increasingly widely applied due to the characteristics of high strength, light dead weight, simplicity and convenience in manufacturing, short construction period, high building industrialization degree and the like. The steel structure itself is not combustible, but rapidly loses strength and deforms at high temperatures. The critical temperature of common building steel is generally 540 ℃, and in a fire, a steel structure without protective measures can reach the critical temperature within a few minutes, so that the bearing capacity is rapidly reduced, and the building is partially or completely collapsed and damaged, so that the steel structure building needs to adopt corresponding fireproof measures. For high-rise residential buildings with first-class fire ratings, the fire resistance limit of load-bearing walls and columns cannot be lower than 3 hours and the fire resistance limit of beams cannot be lower than 2 hours, according to the requirements of the building design fire protection code (GB 50016-2014). The fireproof coating for the thin and ultra-thin steel structure in China at present has poor fireproof performance and cannot meet the requirement of the fireproof limit of a bearing wall and a bearing column for 3 hours; the existing common thick steel structure fireproof coating has the defects of easiness in hollowing, cracking, falling and the like, the compressive strength is only 1-1.5 MPa generally, the surface is loose and rough after molding, and a decorative plate or an outer cover decorative coating needs to be coated.
Disclosure of Invention
The invention aims to provide a gypsum-based steel structure fireproof protection material. The fireproof material is compounded by desulfurized gypsum, light heat-insulating material, additive and the like, and can be used for fireproof protection of various steel structure buildings. Through physical and chemical property detection and member fire-resistant limit detection, various physical and chemical property indexes and fire-proof performance of the product can meet or exceed the requirements of steel structure fire-proof coating standard (GB 14907-2002).
In order to achieve the purpose, the invention adopts the following technical scheme:
the gypsum-based steel structure fireproof protection material is characterized by being prepared by mixing the following components in percentage by mass: 84 to 95 percent of desulfurized gypsum, 3 to 15.5 percent of light heat insulating material, 0.1 to 0.5 percent of water-retaining agent, 0.1 to 1 percent of redispersible latex powder, 0.1 to 0.5 percent of retarder and 0.01 to 0.1 percent of air entraining agent; the light heat-insulating material is one or two of vitrified micro bubbles, closed-cell expanded perlite, expanded vermiculite, sepiolite or flaky mica.
Further, the gypsum-based steel structure fireproof protection material is preferably prepared by mixing the following components in percentage by mass: 90 to 95 percent of desulfurized gypsum, 4 to 9 percent of light heat insulating material, 0.1 to 0.5 percent of water-retaining agent, 0.1 to 0.3 percent of redispersible latex powder, 0.3 to 0.5 percent of retarder and 0.01 to 0.05 percent of air entraining agent.
The desulfurization gypsum is an industrial byproduct obtained by calcining and aging waste residues discharged after wet desulfurization in a power plant at the temperature of 160-4·1/2H2O。
Furthermore, the vitrified micro bubbles are prepared from vitreous lava sand through processes of expansion, vitrification and the like, the surface is vitrified and sealed, the vitrified micro bubbles are irregular spherical, the interior is an inorganic granular material with a porous cavity structure, the moisture is difficult to enter the interior of the vitrified micro bubbles due to the extremely high vitrification rate, the excellent heat preservation and insulation performance is ensured, and the vitrified micro bubbles have good dispersibility and workability due to the smooth surface after vitrification, so that the requirements of different construction processes can be met. The vitrified micro bubbles have stable physical and chemical properties, and have the excellent characteristics of light weight, heat preservation, heat insulation, fire prevention, high temperature resistance, aging resistance, low water absorption rate and the like.
The surface vitrification closed pore rate of the vitrified micro bubbles adopted by the invention is more than 90 percent, the volume water absorption rate is less than 25 percent, and the bulk density is 80-120kg/m3。
Furthermore, the closed-cell expanded perlite is heated by an electric furnace, and the surface of the product is melted and the air holes are closed by gradient heating of perlite ore sand and accurate control of the dead time, so that the interior of the product keeps a honeycomb structure unchanged and the appearance of the product is irregular particles. The closed-cell expanded perlite has the advantages of light weight, fire resistance, environmental protection and the like of the traditional expanded perlite, and also overcomes the defects of high water absorption, low strength and poor fluidity of the traditional expanded perlite.
The bulk density of the closed-cell expanded perlite adopted by the invention is 120-150kg/m3The volume water absorption rate is less than 50%, and the thermal conductivity is less than 0.05W/(mK).
Furthermore, the expanded vermiculite is a golden yellow granular material which is prepared by drying, crushing and roasting vermiculite as a raw material, rapidly increasing the volume in a short time and expanding by 6-20 times, and has the characteristics of light volume weight, small heat conductivity coefficient, fire resistance, corrosion resistance, stable chemical property, no toxicity, no odor and the like.
The density of the expanded vermiculite adopted by the invention is less than or equal to 100kg/m3The heat conductivity coefficient is less than 0.062W/(m.K), and the water content is less than or equal to 3 percent.
Furthermore, the sepiolite is fibrous hydrated mineral clay, and a cluster-shaped fibrous structure of the sepiolite contains a large number of nanometer-scale pore canals, so that the sepiolite has a good heat insulation effect. The sepiolite has the characteristics of low shrinkage rate, large specific surface area and strong adsorbability, has extremely high thermal stability and can resist high temperature of 1500-1700 ℃.
The sepiolite adopted by the invention has the fiber length of 3-8mm and the diameter of 12-18 mu m.
Furthermore, the sheet mica is a low-price silicate clay with a layered structure, has excellent electrical insulation, heat resistance, water resistance, chemical resistance, elasticity and high stripping property, has good compatibility with the water-based fireproof coating, and can improve the bonding strength and the fire resistance of the fireproof coating.
The thickness of the flaky mica adopted by the invention is 0.5-10 mu m, and the sheet diameter is less than 0.2 mm.
Furthermore, the additive is a mixture of a water-retaining agent, redispersible latex powder, a retarder and an air entraining agent.
The water-retaining agent of the invention adopts hydroxyethyl methyl cellulose ether or hydroxypropyl methyl cellulose ether with the viscosity range of 1.5-6 ten thousand. Cellulose ether is a high molecular polymer with a three-dimensional network structure, and a plurality of hydrophilic groups such as carboxyl groups, hydroxyl groups, phthalein amine groups and ether groups are arranged on the crosslinked network structure, and when the cellulose ether is contacted with water, the groups are combined with water molecules to form hydrogen bonds, and a large amount of water is absorbed by the groups. The water-retaining agent can ensure that the mixing water is not absorbed or evaporated by the base wall surface when the water-paste ratio is lower, so that the gypsum-based material is fully hydrated, and the bonding strength is ensured.
The redispersible latex powder comprises one or two of ethylene/vinyl acetate copolymer, vinyl acetate/versatic acid ethylene copolymer and acrylic acid copolymer. The addition of the redispersible latex powder into the gypsum-based fireproof protection material can obviously improve the bonding strength of the gypsum-based fireproof protection material and has better bonding property on inorganic materials and organic materials.
The retarder is one or two of sodium citrate, sodium tripolyphosphate and sodium hexametaphosphate. The setting time of the semi-hydrated gypsum is very short, and is generally only a few minutes to a dozen minutes, so that a retarder must be added into the gypsum-based fireproof protection material to ensure that the gypsum-based fireproof protection material can meet the requirements of normal construction.
The air entraining agent is one or two of sodium alkyl benzene sulfonate and sodium alkyl aryl sulfonate. And a certain amount of micro bubbles are introduced to play a role of a ball bearing, so that the resistance is reduced, and the construction is convenient. Meanwhile, the addition of the air entraining agent also increases the slurry yield of the gypsum-based fireproof protection material and reduces the usage amount of the gypsum-based fireproof protection material in unit area.
The gypsum-based steel structure fireproof protection material provided by the invention comprises the following specific steps in construction:
1. base layer treatment: before construction, the surface of a component is thoroughly derusted and coated with two layers of antirust paint, and the component coated with the antirust paint is subjected to surface dust removal, oil stain removal and the like (the antirust paint is required to be dried completely, a paint film is not damaged, the integrity of the paint film is ensured), and the surface of a base material is kept clean.
2. Construction of fire-proof protective material
The construction can be divided into two conditions of vertical members such as steel tube concrete bundle combined members, steel tube concrete columns, steel columns and the like and steel beams:
1) constructing the steel tube concrete bundle combined member, the steel tube concrete column and the steel column fireproof protective coating: (1) after the antirust paint is dried and the surface is cleaned, the surface of the component is measured and paid off, and then a hot-dip galvanized steel wire mesh with the same area and aperture of 30mm and the same wire diameter of 1.0mm is hung. Uniformly distributing galvanized nails with the diameter of 4mm and the length of 35 or 40mm on the surface of the member by using nail guns, wherein the nail spacing is required to be less than or equal to 600mm, the nail heads completely enter the wall of the steel pipe, and the length of the nails outside the wall of the steel pipe is required to be kept between 20 and 30 mm; b. binding the steel wire mesh on the galvanized steel nail head by using a hot galvanizing binding steel wire; c. and flattening the raised part of the metal net by using a steel bar so as to keep the distance between the net and the surface of the member to be about 10-35 mm. (2) Pouring the fireproof protective coating into a stirrer according to the proportion of 1: water-cement ratio of 0.63-0.65, slowly adding water, uniformly stirring, and spraying the steel tube concrete bundle combined member or the steel tube concrete column. When spraying, the distance between the nozzle and the surface of the component is preferably (100) and 200 mm, and the nozzle is kept perpendicular to the surface of the component; the spraying sequence is from left to right, from top to bottom, and the spraying is formed in one step. After spraying a certain area, the spraying surface is initially leveled by a scraper. And (4) timely supplementing slurry for spraying at the slurry leakage part, leveling the spraying surface by using a scraping ruler, and after initial setting, performing slurry preparation and polishing before final setting.
2) Construction of the fireproof protection material of the steel beam: (1) and after the antirust paint is dried and the surface is cleaned, measuring and paying off the surface of the steel beam, and hanging a hot-dip galvanized steel wire mesh with the aperture of 30mm and the wire diameter of 1.0mm on the lower flange of the steel beam. The step of hanging the net comprises the steps of cutting a steel wire mesh, folding the steel wire mesh into a C shape, and hanging the C shape upside down on the lower flange of the steel beam; the steel wire mesh is guaranteed to be the same as the steel beam in width after being folded into a C shape, the depth of each side extending into the lower flange is larger than or equal to 50mm, and the steel wire mesh surface is kept to be suspended 10-20 mm below the lower flange of the steel beam. (2) Pouring the fireproof protective coating into a stirrer according to the proportion of 1: water-cement ratio of 0.63-0.65, slowly adding water, uniformly stirring, and spraying on the surface of the steel beam. When spraying, the distance between the nozzle and the surface of the steel beam is preferably (100 and 200) mm, and the nozzle is kept vertical to the surface; the spraying sequence is that the spraying is performed from the abdominal cavity at one side of the steel beam to be filled, after the designed size is reached, the abdominal cavity at the other side of the steel beam is sprayed, and meanwhile, the abdominal cavity surface of the steel beam at the first side is primarily leveled by a scraping ruler; after the abdominal cavity of the second side of the steel beam is sprayed and filled to reach the design size, spraying the bottom of the beam, and simultaneously primarily leveling the abdominal cavity of the steel beam on the second side by using a scraping ruler; and finally, primarily leveling the bottom surface of the beam by using a scraper. And after the initial leveling is finished, observing the two sides of the abdominal cavity of the steel beam and the bottom of the steel beam, timely supplementing slurry for spraying at the slurry leakage part, leveling the spraying surface by using a scraping ruler, and after the initial setting, performing slurry pre-setting and finishing.
Has the advantages that: compared with the existing thick, thin and ultrathin steel structure fireproof coating, the invention has the following advantages:
1) the invention adopts gypsum-based spraying slurry to carry out steel structure fireproof protection, and the main component of the slurry, namely gypsum, is derived from industrial solid waste desulfurized gypsum, so that the gypsum-based spraying slurry has the social and economic benefits of low price, wide source, waste utilization, environmental protection and the like.
2) After the fireproof protection construction is finished, the main component of the fireproof protection layer of the component is dihydrate gypsum (CaSO) obtained by hydrating hemihydrate gypsum4·2H2O). The molecular structure of the dihydrate gypsum contains two water molecules, when the component is fired, the dihydrate gypsum can absorb heat and release crystal water at the same time, and the crystal water is evaporated and takes away a large amount of heat, so that the dihydrate gypsum can effectively delayThe rate of temperature rise of the member. The steel plate fire test shows that after the temperature of the steel plate reaches 100 ℃, the temperature rise of the steel plate can be delayed for 30 minutes (the thickness of the fireproof protective layer is 35mm) due to the evaporation of crystal water in the dihydrate gypsum, and the gypsum-based fireproof protective material has an excellent fireproof and heat-insulating function.
3) By adding the light heat-insulating material and the air entraining agent into the material, the dry density and the heat conductivity coefficient of the material are reduced, and the fireproof and heat-insulating properties of the material are further enhanced; the adhesive is added, so that the adhesive force of the material is ensured, and the problem of coating falling off is avoided; the gypsum material has the characteristics of micro expansion when being hardened, and has small shrinkage rate after being hardened, so the gypsum material has the advantages of strong adhesive force, no hollowness and no cracking.
4) The gypsum-based spraying slurry is constructed mechanically, so that the construction speed is high, the labor intensity is low, and the labor cost is saved.
5) Besides good heat preservation effect, the gypsum can also adjust the indoor humidity, is called as a breathable material, and can improve the indoor living environment.
6) The gypsum-based spraying slurry has higher hardness and good decoration effect, does not need to be wrapped and protected and subjected to surface decoration treatment like the traditional fireproof coating, and has certain hanging capacity.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.
Example 1
The gypsum-based steel structure fireproof protection material comprises the following components in parts by weight: 84 percent of desulfurized gypsum provided by Shanxi jin energy power group company Limited and 150kg/m of bulk density of 120-35 percent of closed-cell expanded perlite with volume water absorption rate of less than 50 percent and thermal conductivity coefficient of less than 0.05W/(m.K), and the density provided by Shijiazhuang Chenxing practical Co Ltd is less than or equal to 100kg/m3Expanded vermiculite with heat conductivity less than 0.062W/(m.K) and water content less than or equal to 3% in 10.5%, and water retaining agent hydroxyethyl methyl cellulose ether (type EGC168) with viscosity of 30000 mPa.s provided by Nippon Yuan; available from Japanese synthetic chemistry0.2 percent of redispersed latex powder vinyl acetate/vinyl versatate copolymer (the model is DM 200); retarder sodium hexametaphosphate 0.1 percent; 0.1 percent of air entraining agent sodium alkyl benzene sulfonate.
Example 2
The gypsum-based steel structure fireproof protection material comprises the following components in parts by weight: 95 percent of desulfurized gypsum provided by Shanxi Jinneng electric power group Limited company, 2 percent of sepiolite with the fiber length of 3-8mm and the diameter of 12-18 mu m provided by Hebei Hongli sepiolite cashmere Limited company, 1 percent of flaky mica with the sheet diameter of less than 0.2mm and 0.5 percent of water-retaining agent hydroxyethyl methyl cellulose ether (the model is XCS47107) with the viscosity of 15000 mPa.s provided by the Tao chemical, wherein the thickness of the flaky mica is 0.5-10 mu m and the sheet diameter of the flaky mica is less than 0.2 mm; 1% of redispersible latex powder ethylene/vinyl acetate copolymer (model of 5010N) provided by Wake chemistry; retarder sodium tripolyphosphate 0.4%; 0.1 percent of air entraining agent sodium alkyl benzene sulfonate.
Example 3
The gypsum-based steel structure fireproof protection material comprises the following components in parts by weight: 95 percent of desulfurized gypsum provided by Shanxi Jinneng power group company Limited, more than 90 percent of surface vitrification closed pore rate provided by Senyang perlite application company Limited in Xinyang city, less than 25 percent of volume water absorption rate and 80-120kg/m of bulk density34 percent of vitrified micro bubbles, 0.39 percent of water-retaining agent hydroxyethyl methyl cellulose ether (model number is BX165M) with the viscosity of 60000 mPa.s provided by Hercules Skopp; 0.1% of redispersible latex powder acrylic copolymer (model LDM7000P) provided by Japanese synthetic chemistry; 0.5 percent of retarder sodium citrate; 0.01 percent of air entraining agent alkyl aryl sodium sulfonate.
Example 4
The gypsum-based steel structure fireproof protection material comprises the following components in parts by weight: 90 percent of desulfurized gypsum provided by Shanxi Jinneng electric power group company Limited, more than 90 percent of surface vitrification closed pore rate provided by Senyang perlite application company Limited in Xinyang city, less than 25 percent of volume water absorption rate and 80-120kg/m of bulk density39 percent of vitrified micro bubbles, 0.35 percent of water-retaining agent hydroxypropyl methyl cellulose ether (model number is ME6019) with viscosity of 40000 mPa.s provided by Hercules Skoogu; japanese0.3 percent of redispersible latex powder acrylic copolymer (model of LDM7000P) provided by synthetic chemistry; 0.3 percent of retarder sodium citrate; 0.05 percent of air entraining agent alkyl aryl sodium sulfonate.
As can be seen from the sample test results shown in Table 1, the gypsum-based steel structure fireproof protection material has good construction performance and proper drying time, and is beneficial to meeting the construction requirements. The technical performance indexes reach and exceed the requirements of GB14907-2002, and the main outstanding performance is expressed on the indexes of bonding strength, compressive strength and fire resistance limit. In addition, a fire endurance test is carried out on the steel tube bundle combined shear wall component with the thickness of the fireproof protection layer of 35mm, the load ratio of the component is 0.65, the fire endurance reaches 3.5 hours, and the requirement of the fire endurance of the bearing wall and the column for 3 hours is exceeded.
TABLE 1 Performance comparison test
Claims (9)
1. The utility model provides a gypsum base steel construction fire prevention protective material which characterized in that: the gypsum-based steel structure fireproof protection material is prepared by mixing the following components in percentage by mass: 84-95% of desulfurized gypsum, 3-15.5% of light heat insulating material, 0.1-0.5% of water-retaining agent, 0.1-1% of redispersible latex powder, 0.1-0.5% of retarder and 0.01-0.1% of air-entraining agent;
the light heat-insulating material is one or two of vitrified micro bubbles, closed-cell expanded perlite, expanded vermiculite, sepiolite or flaky mica;
the desulfurized gypsum is an industrial byproduct obtained by calcining and aging waste residues discharged after wet desulfurization in a power plant at the temperature of 160-4·1/2H2O。
2. The gypsum-based steel structural fire protection material of claim 1, wherein: the water-retaining agent is hydroxyethyl methyl cellulose ether or hydroxypropyl methyl cellulose ether with the viscosity range of 1.5-6 ten thousand.
3. The gypsum-based steel structural fire protection material of claim 1, wherein: the redispersible latex powder comprises one or two of ethylene/vinyl acetate copolymer, vinyl acetate/versatic acid ethylene copolymer and acrylic acid copolymer.
4. The gypsum-based steel structural fire protection material of claim 1, wherein: the retarder is one or two of sodium citrate, sodium tripolyphosphate or sodium hexametaphosphate.
5. The gypsum-based steel structural fire protection material of claim 1, wherein: the air entraining agent is one or two of sodium alkyl benzene sulfonate and sodium alkyl aryl sulfonate.
6. The gypsum-based steel structural fire protection material of claim 1, wherein: the gypsum-based steel structure fireproof protection material is prepared by mixing the following components in percentage by mass: 90-95% of desulfurized gypsum, 4-9% of light heat insulating material, 0.1-0.5% of water-retaining agent, 0.1-0.3% of redispersible latex powder, 0.3-0.5% of retarder and 0.01-0.05% of air-entraining agent.
7. The gypsum-based steel structural fire protection material of claim 1, wherein: the surface vitrification closed pore rate of the vitrified micro bubbles is more than 90 percent, the volume water absorption rate is less than 25 percent, and the bulk density is 80-120kg/m3。
8. The gypsum-based steel structural fire protection material of claim 1, wherein: the bulk density of the closed-cell expanded perlite is 120-150kg/m3The volume water absorption rate is less than 50%, and the thermal conductivity is less than 0.05W/(mK).
9. The gypsum-based steel structural fire protection material of claim 1, wherein: the density of the expanded vermiculite is less than or equal to 100kg/m3The thermal conductivity is less than 0.062W/(m.K), the water content is less than or equal to 3 percent; the length of the fiber of the sepiolite is 3-8mm, and the diameter of the fiber is 12-18 mu m; the thickness of the flaky mica is 0.5-10 mu m, and the sheet diameter is less than 0.2 mm.
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| CN110130533A (en) * | 2019-04-29 | 2019-08-16 | 杭萧钢构股份有限公司 | A kind of the plastering gupsum construction method and steel structure member flameproof protection device of the steel structure wall with corrosion-inhibiting coating |
| CN112679184A (en) * | 2020-12-28 | 2021-04-20 | 鲁米科技(山东)有限公司 | Gypsum-based non-intumescent fire-retardant coating for steel structure |
| CN114045052A (en) * | 2021-12-08 | 2022-02-15 | 福州大学 | Single-component gypsum-alkali slag fireproof coating and preparation method thereof |
| WO2024007251A1 (en) | 2022-07-07 | 2024-01-11 | Sika Technology Ag | A human friendly high performance fireproof mortar |
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| CN102643071A (en) * | 2012-05-17 | 2012-08-22 | 浙江方远建材科技有限公司 | Calcination-free desulfurized gypsum walling plastering dry-mixed mortar |
| CN105777039A (en) * | 2016-03-31 | 2016-07-20 | 武汉理工大学 | Phosphogypsum-based light-weight insulation board and preparation method thereof |
| CN106187014A (en) * | 2016-08-08 | 2016-12-07 | 长安大学 | A kind of desulfurized gypsum base heat preservation slurry and lightweight light gauge cold-formed steel shape combined wall thereof |
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| US20070066165A1 (en) * | 2003-03-05 | 2007-03-22 | Fyfe Edward R | Fire protection coating for FRP-reinforced structure |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643071A (en) * | 2012-05-17 | 2012-08-22 | 浙江方远建材科技有限公司 | Calcination-free desulfurized gypsum walling plastering dry-mixed mortar |
| CN105777039A (en) * | 2016-03-31 | 2016-07-20 | 武汉理工大学 | Phosphogypsum-based light-weight insulation board and preparation method thereof |
| CN106187014A (en) * | 2016-08-08 | 2016-12-07 | 长安大学 | A kind of desulfurized gypsum base heat preservation slurry and lightweight light gauge cold-formed steel shape combined wall thereof |
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