CN113954233A - Preparation method of phosphogypsum prefabricated member and phosphogypsum prefabricated member - Google Patents
Preparation method of phosphogypsum prefabricated member and phosphogypsum prefabricated member Download PDFInfo
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- CN113954233A CN113954233A CN202111263428.1A CN202111263428A CN113954233A CN 113954233 A CN113954233 A CN 113954233A CN 202111263428 A CN202111263428 A CN 202111263428A CN 113954233 A CN113954233 A CN 113954233A
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- phosphogypsum
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- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 117
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000004567 concrete Substances 0.000 claims abstract description 44
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 14
- 238000013461 design Methods 0.000 claims description 18
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 239000011707 mineral Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 239000004575 stone Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 8
- 239000011150 reinforced concrete Substances 0.000 abstract description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 239000004615 ingredient Substances 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000012615 aggregate Substances 0.000 description 21
- 238000002156 mixing Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000002686 phosphate fertilizer Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000005955 Ferric phosphate Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229940032958 ferric phosphate Drugs 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/29—Producing shaped prefabricated articles from the material by profiling or strickling the material in open moulds or on moulding surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- 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
- C04B28/143—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 phosphogypsum
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a preparation method of a phosphogypsum prefabricated part, which uses phosphogypsum concrete to replace the traditional cement concrete and basalt fiber reinforcement to replace the traditional reinforcing steel bar, and the designed formula of the phosphogypsum concrete can ensure that the phosphogypsum concrete and the basalt fiber reinforcement are organically combined, so that the mechanical property of the phosphogypsum prefabricated part meets the use requirement, the corrosion of harmful ingredients in the phosphogypsum to a reinforcement material is effectively prevented, and the durability of the phosphogypsum prefabricated part is ensured. The ardealite prefabricated member is used for replacing a reinforced concrete prefabricated member, a new path for comprehensively utilizing ardealite is developed, and the purpose of changing waste into valuable is achieved. The phosphogypsum prefabricated member provided by the invention is prepared by the preparation method, has the characteristics of simple production method, low cost, light weight, high bearing capacity, low manufacturing cost and the like, can be widely applied to highway engineering and municipal engineering construction in China, and realizes high-value utilization of phosphogypsum.
Description
Technical Field
The invention relates to the field of engineering construction and phosphorus chemical industry, in particular to a preparation method of a phosphogypsum prefabricated member and the phosphogypsum prefabricated member.
Background
Phosphogypsum is a byproduct in the production of phosphate fertilizer and wet-process phosphoric acid, and the main components of the phosphogypsum contain a small amount of undecomposed powdered rock phosphate, free phosphoric acid, ferric phosphate, aluminum phosphate, calcium hydrophosphate and fluosilicate which are eutectic with gypsum and other impurities besides calcium sulfate. The demand of phosphate fertilizer in China is large, hundreds of millions of tons of phosphorus gypsum are generated every year, a large amount of land resources are occupied, and serious environmental pollution is caused.
At present, national treatment of phosphogypsum is mainly carried out by stacking in factory areas and burying in mining areas, and serious hidden danger of environmental pollution exists; the comprehensive utilization rate of the phosphogypsum is only about 20 percent, which is far lower than the requirement of the national development and reform Commission, and a new path for the utilization of the phosphogypsum solid waste is urgently needed to be developed.
On the other hand, the highway engineering and municipal engineering construction in China are rapidly developed, a large number of concrete prefabricated parts are needed, and how to effectively utilize the phosphogypsum to manufacture the prefabricated parts can not only meet the engineering construction requirements, but also realize high-value utilization of the phosphogypsum and achieve the purpose of changing waste into valuables.
Disclosure of Invention
The invention aims to provide a preparation method of a phosphogypsum prefabricated member and the phosphogypsum prefabricated member aiming at the defects and the environmental protection requirements in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a phosphogypsum prefabricated part, which comprises the following steps:
step S1, manufacturing a prefabricated part mold according to the design drawing of the prefabricated part;
step S2, arranging basalt fiber ribs at the lower part of the prefabricated part mould;
step S3, uniformly stirring the phosphogypsum concrete, paving the phosphogypsum concrete in a prefabricated part mould, and flattening the surface of the phosphogypsum concrete after the phosphogypsum concrete is mechanically vibrated to be dense;
step S4, steam curing the ardealite prefabricated part (together with the mould) obtained in the step S3 for 4-5 hours at the temperature of 74 +/-5 ℃;
and step S5, removing the film from the ardealite prefabricated part die obtained in the step S4, and curing for not less than 7 days under natural conditions to obtain the ardealite prefabricated part.
Further, in step S3, the phosphogypsum concrete comprises the following components in parts by weight: 20-45 parts of phosphorus gypsum, 2-10 parts of mineral powder, 0.5-5 parts of cement and 20-60 parts of aggregate.
Further, in step S3, the aggregate is phosphogypsum aggregate or broken stone aggregate, and the particle size of the phosphogypsum aggregate or broken stone aggregate is 1-3 cm.
Further, in the step S2, proper numbers of basalt fiber ribs are arranged in parallel at equal intervals on the same horizontal plane at a height of about 10-30 mm from the bottom of the prefabricated part mold, and the distance between the basalt fiber ribs on two sides and the side wall of the prefabricated part mold is 1-3 cm. The appropriate number of basalt fiber ribs is determined by calculation according to the bearing capacity requirement of the prefabricated member.
Further, in step S2, the length of the basalt fiber bar is-2 to +10cm of the span of the phosphogypsum prefabricated part.
Further, in step S2, bending both ends of the basalt fiber rib at an angle of 90 ° and at a length of 2-10 cm.
Further, the diameter range of the basalt fiber ribs is 6-22 mm.
The invention also provides a phosphogypsum prefabricated part obtained by adopting the preparation method.
Furthermore, the bearing capacity of the ardealite prefabricated member is not less than the use load requirement of the ardealite prefabricated member.
Furthermore, the phosphogypsum prefabricated part comprises a phosphogypsum rectangular plate and a phosphogypsum cable trench cover plate.
The technical scheme provided by the invention has the beneficial effects that:
(1) the invention provides a preparation method of a phosphogypsum prefabricated part, which takes phosphogypsum concrete and basalt fiber reinforcement as main materials, designs the phosphogypsum prefabricated part according to the structural size of the prefabricated part, and enables the bearing capacity of the phosphogypsum prefabricated part to meet the use requirements of pedestrians and non-motor vehicles or meet the use requirements of motor vehicles. The phosphogypsum concrete replaces the traditional cement concrete, the basalt fiber reinforcement replaces the traditional reinforcing steel bar, the designed phosphogypsum concrete formula can ensure the mutual cementing action of the phosphogypsum concrete and the basalt fiber reinforcement, the corrosion of harmful ingredients in the phosphogypsum to a reinforced material is effectively prevented while the mechanical property of a prefabricated member is ensured, the durability is good, and the phosphogypsum prefabricated member replaces the reinforced concrete prefabricated member, so that a new way for comprehensively utilizing the phosphogypsum is developed, and the purpose of changing waste into valuable is achieved.
(2) The phosphogypsum prefabricated member provided by the invention is prepared by the preparation method, is simple in production method and low in cost, can be produced in batch, has the characteristics of light weight, high bearing capacity, low manufacturing cost and the like compared with the traditional concrete prefabricated member, can be widely applied to highway engineering and municipal engineering construction in China, and realizes high-value utilization of phosphogypsum.
Drawings
FIG. 1 is a layout of a rectangular plate of phosphogypsum (600 cm. times.99 cm. times.40 cm) prepared in example 1;
figure 2 is a design drawing of the phosphogypsum cable trench cover plate (50cm x 10cm) prepared in example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the structural design, mix design and preparation method of the phosphogypsum prefabricated member will be described in detail.
1. Phosphogypsum prefabricated part structure design method
The ardealite prefabricated part structure design method of the invention is that ardealite concrete and basalt fiber bars are used as main materials, ardealite prefabricated parts are designed according to the structure size of the prefabricated parts, and the bearing capacity of the ardealite prefabricated parts meets the use requirements of pedestrians and non-motor vehicles or meets the use requirements of motor vehicles. The phosphogypsum concrete is used for replacing cement concrete, and the strength is not lower than 20 MPa. The basalt fiber reinforcement replaces a reinforcing steel bar, so that the mechanical property of the prefabricated part is ensured, the corrosion of harmful ingredients in the phosphogypsum to a reinforcement material is effectively prevented, and the purpose of improving the durability of the phosphogypsum prefabricated part is achieved. The diameter of the basalt fiber rib is preferably 6-22 mm, the number of the basalt fiber rib is calculated and determined according to the bearing capacity requirement of the prefabricated part, the arrangement position is that the tensile region of the prefabricated part is close to the maximum tensile stress part, and the arrangement direction is consistent with the tensile stress direction of the prefabricated part.
The calculation formula for determining the quantity of the basalt fiber ribs is as follows:
the calculation formula of the height of the concrete compression zone is as follows:
∑X＝0，α1fcbx＝fyAs-fy'As'
the normal section flexural bearing capacity calculation formula is as follows:
the height of the compression zone should conform to the following equation:
2α'≤x≤ξbh0
the cross-sectional area of the longitudinal stressed steel bar meets the following requirements:
As≥ρminbh
in the formula: m-bending moment design value;
α1coefficients calculated according to the specification of article 6.2.6 of the specification of concrete Structure design Specification (GB-50010-2010(2015 edition));
fc-designed axial compressive strength of phosphogypsum concrete;
As、A's-the cross-sectional area of the longitudinal rebars of the tension zone and compression zone;
b-the width of the rectangular cross-section;
h-height of the rectangular cross section;
h0-a cross-sectional effective height;
α'、α's-the distance from all longitudinal tendon force points of the compression zone to the cross-sectional compression edge;
ρmin-minimum reinforcement ratio.
2. Phosphogypsum concrete mix proportion design method
The phosphogypsum concrete is prepared from phosphogypsum, mineral powder, cement and aggregate according to a reasonable mixing ratio by taking the phosphogypsum, the mineral powder and the cement in a certain proportion as binders and phosphogypsum spheroids with certain gradation as aggregates. The design method and the program are as follows:
(1) the theoretical design strength of the phosphogypsum mixture without the phosphogypsum aggregate is improved by 20 percent according to the design strength of the phosphogypsum concrete and reaches 24 MPa.
(2) The phosphogypsum is used as a base material, cement and mineral powder are used as an excitant and a curing agent, and the dosage is reasonably selected, wherein the cement is 0.5-5 parts in parts by weight, and the mineral powder is 2-10 parts in parts by weight, so that a phosphogypsum mixture is prepared.
(3) Uniformly mixing the materials, then loading the materials into 2 groups of test molds with the diameter of 150mm multiplied by 150mm, removing the molds after steam curing, and then carrying out a first group of test mold compressive strength tests; and the second group is subjected to a compressive strength test after the second group is subjected to steam curing, mold stripping and natural curing for 7 days.
(4) If the strength of 7d meets the design requirement, the mixing proportion is the mixing proportion of the phosphogypsum mixture.
(5) According to the mixing proportion of the phosphogypsum mixture, 30 parts, 40 parts and 50 parts of phosphogypsum aggregates or broken stone aggregates with the particle size of 1-3 cm are added within the range of 20-60 parts by weight, 2 groups of test pieces of each proportion are respectively subjected to steam curing and 7d of compressive strength, the 7d of strength is qualified, and the mixing proportion with the best comprehensive effect is the mixing proportion of the phosphogypsum concrete. If the strength requirement is not satisfied after the 3 kinds of proportion phosphorus gypsum aggregate or broken stone aggregate are mixed, the mixing amount of the aggregate is adjusted according to the change rule of the strength of the phosphogypsum concrete with different mixing amounts of the aggregate until the strength is qualified.
3. Preparation method of phosphogypsum prefabricated part
The preparation method of the ardealite prefabricated part comprises the following steps of:
(1) manufacturing a mould according to the structural size of the phosphogypsum prefabricated part;
(2) the height of the prefabricated part mold is about 10-30 mm, proper basalt fiber ribs are arranged on the same horizontal plane at equal intervals, the length of the basalt fiber ribs is minus 2-plus 10cm of the prefabricated part span, for the prefabricated part with higher bearing capacity requirement, two ends of the prefabricated part can be provided with 90-degree angles, and the length of each prefabricated part is 2-10 cm of a hook. And the number and the diameter of the basalt fiber ribs are determined by calculation according to the bearing capacity requirement of the phosphogypsum prefabricated part.
(3) Adding phosphogypsum, phosphogypsum aggregate or broken stone aggregate, cement and mineral powder in sequence according to the mixing proportion of the phosphogypsum concrete, and uniformly stirring by adopting a forced concrete stirrer.
(4) Pouring the uniformly mixed phosphogypsum concrete into a mould, compacting through mechanical vibration, and then manually flattening the surface to ensure the surface to be flat.
(5) Steam curing the ardealite prefabricated part at 74 +/-5 ℃ for 4.5 +/-0.5 h, and then demoulding.
(6) Naturally curing for more than 7 days after demoulding, and putting into application when the strength of the product reaches the design requirement.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1:
phosphogypsum rectangular plate project: the design requires that the length is 600cm, the width is 99cm, the thickness is 40cm, the designed strength of the phosphogypsum concrete is 25MPa, the bearing capacity is not less than 180kN, and the phosphogypsum concrete can bear the load of road vehicles.
The preparation method of the invention is adopted to prepare the phosphogypsum rectangular plate (600cm multiplied by 99cm multiplied by 40cm), and the preparation method comprises the following steps:
step S1, manufacturing a mould according to the structural size of the phosphogypsum rectangular plate shown in figure 1;
step S2, arranging 9 basalt fiber bars with diameter of 20mm and length of 603mm at a height of about 25mm from the bottom of the prefabricated part mould and at equal intervals in the longitudinal direction on the same horizontal plane; and folding two ends of the 9 basalt fiber bars into bent hooks with the angle of 90 degrees and the length of 8cm, wherein the distance between the basalt fiber bars positioned at two sides and the side wall of the prefabricated part mould is 2.5 cm-5 cm. 31 phi 6mm transverse connection basalt fiber bars are arranged at equal intervals of 20cm in the transverse direction.
Step S3, pouring the uniformly mixed phosphogypsum concrete into a mould, and manually flattening the surface after being compacted by mechanical vibration to ensure that the surface is smooth and clean;
wherein, the feeding sequence is that according to the mixing proportion of the phosphogypsum concrete, proper quantities of phosphogypsum, broken stone aggregate, cement and mineral powder are sequentially added, and a forced concrete mixer is adopted to stir uniformly. 48 parts of phosphogypsum, 45 parts of crushed stone aggregate, 2 parts of cement and 5 parts of mineral powder.
Step S4, steam curing the ardealite prefabricated part obtained in the step S3 and the die for 4-5 hours at the temperature of 74 +/-5 ℃;
and S5, removing the film from the ardealite prefabricated member obtained in the step S4, and curing for more than 7 days under natural conditions to obtain the rectangular ardealite plate.
Compared with the performance of the conventional reinforced concrete rectangular plate, the bearing capacity of the phosphogypsum rectangular plate (with the size of 600cm multiplied by 99cm multiplied by 40cm) prepared by the embodiment is improved by 61 percent compared with the conventional rectangular plate, the weight is reduced by 18 percent, and the cost is reduced by 42 percent, which shows that the phosphogypsum rectangular plate has the characteristics of low manufacturing cost, obviously improved bearing capacity, lighter weight, more favorable construction and the like, and can be widely applied to highway engineering and municipal engineering construction.
Example 2:
the ardealite cable trench cover plate prefabricated part project comprises the following steps: the design requirements are that the width is 50cm, the length is 50-100 cm, the thickness is 10cm, and the designed strength of the phosphogypsum concrete is 20 Mpa.
The preparation method of the invention is adopted to prepare the phosphogypsum cable trench cover prefabricated part (50cm multiplied by 10cm), and the preparation method comprises the following steps:
step S1, manufacturing a mould according to the structural size of the cable trench prefabricated part shown in the figure 1;
step S2, arranging 5 basalt fiber ribs with diameter of 6mm and length of 57cm at the same horizontal plane at the height of about 25mm from the bottom of the prefabricated part mould at equal intervals; and (3) folding the two ends of the 5 basalt fiber ribs into 90-degree angles, bending hooks with the length of 6cm, and enabling the basalt fiber ribs positioned on the two sides to be 2.5cm away from the side wall of the prefabricated part mould. 6 transverse connection basalt fiber ribs with the diameter of 6mm are arranged at equal intervals of 10cm in the transverse direction.
Step S3, pouring the uniformly mixed phosphogypsum concrete into a mould, and manually flattening the surface after being compacted by mechanical vibration to ensure that the surface is smooth and clean;
wherein, the feeding sequence is that according to the mixing proportion of the phosphogypsum concrete, proper quantities of phosphogypsum, phosphogypsum aggregate, cement and mineral powder are sequentially added, and a forced concrete mixer is adopted to stir uniformly. 49 parts of phosphogypsum, 45 parts of phosphogypsum aggregate, 1 part of cement and 5 parts of mineral powder.
Step S4, performing steam curing on the ardealite prefabricated part die obtained in the step S3 at the temperature of 74 +/-5 ℃ for 4-5 hours;
and step S5, removing the film from the phosphogypsum prefabricated member obtained in the step S4, and curing for more than 7 days under natural conditions to obtain the phosphogypsum cable trench cover plate.
Compared with the performance of the conventional reinforced concrete tunnel cable trench cover plate, the phosphogypsum cable trench cover plate (with the size of 50cm multiplied by 10cm) prepared by the embodiment has the advantages that the bearing capacity of the phosphogypsum cable trench cover plate is improved by 17 percent, the weight is reduced by 18.7 percent, the cost is reduced by 8.9 percent, and the phosphogypsum cable trench cover plate is low in manufacturing cost, remarkably improved in bearing capacity performance, lighter in weight and more beneficial to construction.
The phosphogypsum cable trench cover plate prepared by the embodiment can be widely applied to highway tunnel engineering and municipal engineering, and completely meets the load requirements of pedestrians and/or non-motor vehicles.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A preparation method of a phosphogypsum prefabricated member is characterized by comprising the following steps: the method comprises the following steps:
s1, manufacturing a prefabricated part mold according to the design drawing of the prefabricated part;
s2, arranging proper amount of basalt fiber ribs at the position close to the bottom of the prefabricated part mould;
s3, uniformly stirring the phosphogypsum concrete, paving the phosphogypsum concrete in a prefabricated part mould, and flattening the surface of the phosphogypsum concrete after the phosphogypsum concrete is mechanically vibrated to be dense;
s4, performing steam curing on the ardealite prefabricated part mould obtained in the step S3 at the temperature of 74 +/-5 ℃ for 4-5 hours;
and S5, removing the mold from the ardealite prefabricated part mold obtained in the step S4, and curing for not less than 7 days under natural conditions to obtain the ardealite prefabricated part.
2. The method of manufacturing an ardealite preform according to claim 1, characterized in that: in step S3, the phosphogypsum concrete comprises the following components in parts by mass: 20-45 parts of phosphogypsum, 2-10 parts of mineral powder, 0.5-5 parts of cement and 20-60 parts of aggregate.
3. A method of manufacturing an ardealite preform according to claim 2, characterised in that: the aggregate comprises phosphogypsum aggregate or broken stone aggregate, and the particle size of the aggregate is 1-3 cm.
4. The method of manufacturing an ardealite preform according to claim 1, characterized in that: in the step S2, proper numbers of basalt fiber ribs are arranged in parallel at equal intervals on the same horizontal plane at a height of about 10-30 mm from the bottom of the prefabricated part mold so as to meet the requirement of the bearing capacity of the prefabricated part, and the distance between two ends of the basalt fiber ribs and the side wall of the prefabricated part mold is 1-3 cm.
5. The method of manufacturing an ardealite preform according to claim 4, characterized in that: in step S2, the length of the basalt fiber rib is-2 to +10cm of the span of the phosphogypsum prefabricated part.
6. The method of manufacturing an ardealite preform according to claim 4, characterized in that: in the step S2, bending two ends of the basalt fiber bar into 90-degree angles, wherein the length of each hook is 2-10 cm.
7. The method of manufacturing an ardealite preform according to claim 4, characterized in that: the diameter range of the basalt fiber ribs is 6 mm-22 mm.
8. An ardealite prefabricate, its characterized in that: prepared by the preparation method of any one of claims 1 to 7.
9. An ardealite preform according to claim 8, characterised in that: the bearing capacity of the phosphogypsum prefabricated part is not less than the use load requirement.
10. An ardealite preform according to claim 9, characterised in that: the phosphogypsum prefabricated part comprises a phosphogypsum rectangular plate and a phosphogypsum cable trench cover plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111263428.1A CN113954233A (en) | 2021-10-28 | 2021-10-28 | Preparation method of phosphogypsum prefabricated member and phosphogypsum prefabricated member |
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