CN115490492B - Magnesia cement precast slab, manufacturing method thereof and connecting structure - Google Patents
Magnesia cement precast slab, manufacturing method thereof and connecting structure Download PDFInfo
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- CN115490492B CN115490492B CN202210923342.5A CN202210923342A CN115490492B CN 115490492 B CN115490492 B CN 115490492B CN 202210923342 A CN202210923342 A CN 202210923342A CN 115490492 B CN115490492 B CN 115490492B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/105—Magnesium oxide or magnesium carbonate 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a magnesia cement precast slab, a manufacturing method and a connecting structure thereof, belonging to the technical field of civil engineering building materials; the green environment-friendly magnesia cement precast slab comprises the following raw materials in parts by weight: 2-5 parts of active magnesium oxide, 2-5 parts of common cement, 2-4 parts of fly ash, 30-50 parts of dry sand and 45-55 parts of broken stone. The manufacturing method comprises the following steps: (1) active magnesia cement configuration; (2) blending and layering compression molding; and (3) demolding and carbonization maintenance. The invention applies the active magnesia cement to the production of the prefabricated wallboard, solves the problem of massive pollution caused by the use of cement in the construction industry, takes the active magnesia cement as a green environment-friendly material, absorbs massive carbon dioxide in the preparation process of carbonized raw soil blocks, and is beneficial to realizing the aim of carbon neutralization.
Description
Technical Field
The invention relates to the technical field of civil engineering building materials, in particular to a magnesia cement precast slab, a manufacturing method thereof and a connecting structure.
Background
At present, most of the research on prefabricated wallboards is to use cement concrete to mix and clamp certain reinforcing steel bars to prepare the prefabricated wallboards, and the cement has the problems of high pollution, high energy consumption, high emission and the like in the production and use processes. The active magnesia cement is used as a green and environment-friendly curing agent, has higher feasibility when being applied to prefabricated wall boards, and has important significance for application and popularization of magnesia cement prefabricated boards.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a magnesia cement precast slab, a manufacturing method and a connecting structure thereof.
The technical scheme adopted for solving the technical problems is as follows: the magnesia cement precast slab comprises a precast wallboard, wherein the top of the precast wallboard is fixedly connected with a reinforcing steel bar, a wall surface fixing plate is arranged on the rear side of the precast wallboard, and the precast wallboard is fixed on the surface of the wall surface fixing plate;
a limiting block is fixedly connected to one side of the prefabricated wallboard, a limiting rod is fixedly connected to the surface of the wall surface fixing plate, the limiting block is sleeved on the surface of the limiting rod, a mounting hole matched with the limiting block is formed in the other side of the prefabricated wallboard, and a plurality of reserved holes are formed in the surface of the prefabricated wallboard;
two limit grooves are formed in the side wall surfaces of the prefabricated wall boards, the two limit grooves are symmetrically arranged by taking the side wall center line of the prefabricated wall board as a symmetrical axis, a fixed clamping plate is arranged between the two prefabricated wall boards, and the fixed clamping plate is respectively inserted into the two adjacent limit grooves on the two prefabricated wall boards;
the preformed holes comprise first preformed holes, second preformed holes and third preformed holes, the first preformed holes are used for connecting the prefabricated wall boards with the ground, the second preformed holes are used for connecting the prefabricated wall boards, and the third preformed holes are used for connecting the prefabricated wall boards with the wall surfaces or the prefabricated wall boards;
the components of the cement comprise active magnesia cement, fly ash, dry sand and broken stone; specifically, the cement comprises 2-5 parts of active magnesium oxide, 2-5 parts of common cement, 2-4 parts of fly ash, 30-50 parts of dry sand and 45-55 parts of broken stone.
Preferably, the active magnesium oxide is light burned magnesium oxide.
Preferably, the ordinary Portland cement is 32.5-grade ordinary Portland cement, the fly ash is first-grade fly ash of a test grade, the dry sand is obtained after passing through a mesh screen with the aperture of 2.00mm, and the broken stone is prepared by mechanically crushing and screening natural rock, and the grain size is larger than 4.75mm.
The invention also discloses a manufacturing method of the magnesia cement precast slab, which is used for preparing the magnesia cement precast slab and comprises the following steps:
step one: active magnesia cement formulation
The mass ratio of the active magnesium oxide to the common cement is 1: (0.5-2) and uniformly mixing and stirring the materials according to the design proportion;
step two: blending and layering press forming
Preparing raw materials according to a pre-designed mixing ratio, adding water into the raw materials, stirring, sequentially layering the mixture, filling the mixture into a mould, and finally pressing and forming by a hydraulic press;
step three: demolding and carbonization maintenance
And (3) demolding by using a demolding machine, and immediately placing the demolding machine into a carbonization box for carbonization maintenance.
Preferably, the second step specifically includes:
firstly, selecting a mixing ratio according to the designed weight, and mixing the active magnesia cement, the fly ash, the dry sand and the crushed stone to form a mixed dry material;
secondly, sequentially placing the raw materials into a small stirrer for stirring for 5 minutes; then adding water into the stirred mixed dry material, and continuing stirring for 5 minutes to form a mixed material;
and thirdly, sequentially layering and filling the mixture into a mould, and finally, pressing and forming by a hydraulic press.
Preferably, the water adding amount is 20-30% of the weight of the mixture.
Preferably, the size of the die is 4200 multiplied by 500 multiplied by 150mm, and the bottom and the peripheral side surfaces in the die are uniformly coated with engine oil;
the hydraulic press is pressed and formed at the speed of 0.2kN/s, and is stopped when the speed is 45-60 kN;
the carbonization environment is 50-80% of humidity, 15-30 ℃ of temperature and 10-30% of concentration of CO 2 。
The invention has the beneficial effects that:
(1) The invention takes active magnesia cement as a curing agent, and certain fly ash, dry sand and broken stone are mixed into the precast slab to manufacture and obtain the precast slab; the magnesium carbonate generated in the carbonization treatment process of the prefabricated wallboard formed by the modification of the material changes the original microstructure, fills the pores inside the prefabricated wallboard, and ensures the safety of the magnesia cement prefabricated board in the use process.
(2) The invention selects active magnesia cement as curing agent, which absorbs CO in the carbonization process of the building block 2 The method comprises the steps of carrying out a first treatment on the surface of the The full life cycle of the prefabricated wallboard is low-carbon and environment-friendly; the popularization and application of the energy-saving technology have important significance for energy conservation, emission reduction and sustainable development in the building material industry, and have wide application prospects.
(3) The magnesia cement precast slab obtained by the invention has the characteristics of environmental protection, early strength, high performance, recycling and the like; is environment-friendly, is favorable for realizing carbon peak and carbon neutralization, and can be widely applied to the fields of energy conservation, environmental protection and the like of building materials.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort;
FIG. 1 is a schematic connection of prefabricated wall panels according to the present invention;
FIG. 2 is a schematic view of the connection of the retaining clip of the present invention to a prefabricated wall panel;
fig. 3 is a schematic view of the construction of the prefabricated wall panel of the present invention.
Reference numerals in the drawings are as follows:
1. prefabricating wallboard; 2. reinforcing steel bars; 3. a wall surface fixing plate; 4. a limiting block; 5. a limit rod; 6. a mounting hole; 7. a limit groove; 8. a fixed clamping plate; 9. a preformed hole; 91. a first preformed hole; 92. a second preformed hole; 93. and a third preformed hole.
Detailed Description
Example 1
The magnesia cement precast slab comprises the following raw materials by weight:
the first layer comprises 3 parts of active magnesium oxide, 1.5 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of crushed stone;
the second layer comprises 3 parts of active magnesium oxide, 1.5 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of crushed stone;
the third layer comprises 3 parts of active magnesium oxide, 1.5 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone.
The water addition amount of the mixture is 20-30% of the weight of the mixture, and stirring is continued for 5 minutes.
The ordinary Portland cement adopted in the embodiment is 32.5-grade ordinary Portland cement, the magnesia is high-activity light burned magnesia 150, the fly ash is the first-grade fly ash of test grade, the dry sand is natural sand after passing through a screen with the aperture of 2mm, the broken stone is natural rock, and the grain size is larger than 4.75mm.
Preparing a magnesia raw soil precast slab according to the proportion and the following steps:
step one: active magnesia cement formulation
Active magnesium oxide and common cement according to the proportion of 1: preparing the mixture in a proportion of 0.5, and then uniformly mixing and stirring the mixture to form the active magnesia cement;
step two: blending and layering press forming
According to the proportion, respectively placing the active magnesia cement, the fly ash, the dry sand and the crushed stone into a small stirrer, and stirring for 5 minutes. The water addition amount of the mixture is 20-30% of the weight of the mixture, and stirring is continued for 5 minutes. Preparing a three-layer mixture, sequentially layering and filling the three-layer mixture into a mould, uniformly coating engine oil on the bottom and the peripheral side surfaces in the mould, and finally pressing and forming by a hydraulic press, wherein the mould size is 4200 multiplied by 500 multiplied by 150 mm.
The length, width and height of the raw soil precast slab are 4200mm, 500mm and 150mm respectively, in order to ensure the uniform degree of pressing, the raw soil blocks are pressed at the pressing rate of 0.2kN/s in the pressing process and are respectively pressed and molded for 10s when the raw soil blocks are 10kN, 20kN and 30 kN;
wherein the carbonization environment is 50-80% of humidity, 15-30 ℃ of temperature and 10-30% of concentration of CO 2 。
Step three: demoulding and carbonization maintenance.
And (3) demolding by using a demolding machine, and immediately placing the demolding machine into a carbonization box for carbonization maintenance.
Example 2
The magnesia cement precast slab comprises the following raw materials by weight:
the first layer comprises 3 parts of active magnesium oxide, 3 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone;
the second layer comprises 3 parts of active magnesium oxide, 3 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone;
the third layer comprises 3 parts of active magnesium oxide, 3 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone.
Preparing a magnesia raw soil precast slab according to the proportion and the following steps:
step one: active magnesia cement formulation
Active magnesium oxide and common cement according to the proportion of 1:1, and then uniformly mixing and stirring the mixture to form active magnesia cement;
step two: blending and layering press forming
According to the above, the active magnesia cement, the fly ash, the dry sand and the broken stone are put into a small-sized stirrer according to the designed weight and stirred for 5 minutes. The water addition amount of the mixture is 20-30% of the weight of the mixture, and stirring is continued for 5 minutes. And preparing a three-layer mixture. Sequentially layering and filling the three layers of mixture into a mould, and finally pressing and forming by a hydraulic press.
The length, width and height of the raw soil precast slab are 4200mm, 500mm and 150mm respectively, in order to ensure the uniform degree of pressing, the raw soil blocks are pressed at the pressing rate of 0.2kN/s in the pressing process and are respectively pressed and molded for 10s when the raw soil blocks are 10kN, 20kN and 30 kN;
wherein the carbonization environment is 50-80% of humidity, 15-30 ℃ of temperature and 10-30% of concentration of CO 2 。
Step three: demoulding and carbonization maintenance.
And (3) demolding by using a demolding machine, and immediately placing the demolding machine into a carbonization box for carbonization maintenance.
Example 3
The magnesia cement precast slab comprises the following raw materials by weight:
the first layer comprises 4 parts of active magnesium oxide, 6 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone;
the second layer comprises 4 parts of active magnesium oxide, 6 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone;
the third layer comprises 4 parts of active magnesium oxide, 6 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone.
Preparing a magnesia raw soil precast slab according to the proportion and the following steps:
step one: preparing active magnesia cement;
active magnesium oxide and common cement according to the proportion of 1:1.5, and then uniformly mixing and stirring the mixture to form active magnesia cement;
step two: blending and layering press forming;
according to the proportion, respectively placing the active magnesia cement, the fly ash, the dry sand and the broken stone into a small-sized stirrer according to the designed weight, and stirring for 5 minutes. The water adding amount of the mixture is 0.4-0.6 times of the liquid limit of the raw soil, and stirring is continued for 5 minutes. And preparing a three-layer mixture. Sequentially layering and filling the three layers of mixture into a mould, and finally pressing and forming by a hydraulic press.
The length, width and height of the raw soil prefabricated wallboard are 4200mm, 500mm and 150mm respectively, in order to ensure the uniform degree of pressing, the raw soil building blocks are pressed at the pressing rate of 0.2kN/s in the pressing process, and stay for 10s for pressing and forming respectively at the time of 10kN, 20kN and 30 kN;
wherein the carbonization environment is 50-80% of humidity, 15-30 ℃ of temperature and 10-30% of concentration of CO 2 。
Step three: demoulding and carbonization maintenance.
And (3) demolding by using a demolding machine, and immediately placing the demolding machine into a carbonization box for carbonization maintenance.
Example 4
The magnesia cement precast slab comprises the following raw materials by weight:
the first layer comprises 5 parts of active magnesium oxide, 10 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of crushed stone;
the second layer comprises 5 parts of active magnesium oxide, 10 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone;
the third layer comprises 5 parts of active magnesium oxide, 10 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone.
Preparing the magnesia raw soil prefabricated wallboard according to the proportion and the following steps:
step one: preparing active magnesia cement;
active magnesium oxide and common cement according to the proportion of 1:2, then mixing and stirring the mixture uniformly to form active magnesia cement;
step two: blending and layering press forming;
according to the proportion, respectively placing the active magnesia cement, the fly ash, the dry sand and the broken stone into a small-sized stirrer according to the designed weight, and stirring for 5 minutes. The water addition amount of the mixture is 20-30% of the weight of the mixture, and stirring is continued for 5 minutes. And preparing a three-layer mixture. Sequentially layering and filling the three layers of mixture into a mould, and finally pressing and forming by a hydraulic press.
The length, width and height of the raw soil precast slab are 4200mm, 500mm and 150mm respectively, in order to ensure the uniform degree of pressing, the raw soil blocks are pressed at the pressing rate of 0.2kN/s in the pressing process and are respectively pressed and molded for 10s when the raw soil blocks are 10kN, 20kN and 30 kN;
wherein the carbonization environment is 50-80% of humidity, 15-30 ℃ of temperature and 10-30% of concentration of CO 2 。
Step three: demoulding and carbonization maintenance.
And (3) demolding by using a demolding machine, and immediately placing the demolding machine into a carbonization box for carbonization maintenance.
Example 5
The magnesia cement precast slab comprises the following raw materials by weight:
the first layer comprises 5 parts of active magnesium oxide, 5 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone;
the second layer comprises 5 parts of active magnesium oxide, 5 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone;
the third layer comprises 5 parts of active magnesium oxide, 5 parts of cement, 3 parts of fly ash, 36 parts of dry sand and 55 parts of broken stone.
Preparing the magnesia raw soil prefabricated wallboard according to the proportion and the following steps:
step one: preparing active magnesia cement;
active magnesium oxide and common cement according to the proportion of 1:1, and then uniformly mixing and stirring the mixture to form active magnesia cement;
step two: blending and press molding;
according to the proportion, respectively placing the active magnesia cement, the fly ash, the dry sand and the broken stone into a small-sized stirrer according to the designed weight, and stirring for 5 minutes. The water addition amount of the mixture is 20-30% of the weight of the mixture, and stirring is continued for 5 minutes. Sequentially layering and filling the mixture into a mould, and finally pressing and forming by a hydraulic press.
Step three: demoulding and carbonization maintenance.
And (3) demolding by using a demolding machine, and immediately placing the demolding machine into a carbonization box for carbonization maintenance.
Comparative examples
A concrete precast slab comprises the following raw materials by weight: 15 parts of cement, 26 parts of dry sand, 53 parts of broken stone and 7 parts of water content.
The prefabricated panels prepared in examples 1-5 and comparative examples were subjected to performance tests, and the test results are shown in table 1:
TABLE 1
As can be seen from Table 1, the magnesium oxide cement precast slab prepared by the invention has obviously higher tensile strength, dimensional stability, combustion performance and the like than those of the precast slab in the comparative example, and the precast slab has better bearing capacity, high strength and good fireproof and heat-insulating performance.
According to the magnesium oxide prefabricated panels obtained as described above, a connection structure of the magnesium oxide prefabricated panels is now provided, as shown in fig. 1 to 3, the connection structure is used for mutual fixation of the magnesium oxide prefabricated wall panels, and can be vertically arranged and fixed, and can also be fixed during transverse arrangement; the connecting structure specifically comprises a prefabricated wallboard 1, wherein the top of the prefabricated wallboard 1 is fixedly connected with a reinforcing steel bar 2, the rear side of the prefabricated wallboard 1 is provided with a wall surface fixing plate 3, and the prefabricated wallboard 1 is fixed on the surface of the wall surface fixing plate 3;
one side of the prefabricated wallboard 1 is fixedly connected with a limiting block 4, the surface fixing of the wall surface fixing plate 3 is connected with a limiting rod 5, the limiting block 4 is sleeved on the surface of the limiting rod 5, and the other side of the prefabricated wallboard 1 is provided with a mounting hole 6 matched with the limiting block 4.
Two spacing grooves 7 have been seted up on the lateral wall surface of prefabricated wallboard 1, and two spacing grooves 7 use prefabricated wallboard 1's lateral wall central line to set up as symmetry axisymmetry, are provided with fixed splint 8 between two prefabricated wallboards 1, and fixed splint 8 insert respectively in two adjacent spacing grooves 7 on two prefabricated wallboards 1.
When vertically discharging, insert prefabricated wallboard 1 along gag lever post 5 in proper order, just so can guarantee the order of every prefabricated wallboard 1, then insert fixed splint 8 in both sides, fixed splint 8's insertion mode is, between every adjacent two prefabricated wallboards 1 to in two adjacent spacing groove 7, because two symmetrical spacing groove 7 have all been seted up at every prefabricated wallboard 1 both sides, consequently, two adjacent prefabricated wallboards 1 can all be through fixed centre gripping of fixed splint 8, two liang link to each other, and is stable enough, simple and convenient.
And when transversely discharging, then can directly insert the stopper 4 on the first prefabricated wallboard 1 in the mounting hole 6 on the next prefabricated wallboard 1 to with the fixed concatenation of two adjacent prefabricated wallboards 1, and can splice backward, can fix a position fast.
The surface of the prefabricated wall panel 1 is provided with a plurality of preformed holes 9 for connection with the wall surface, the ground or the prefabricated wall panel 1.
The reserved holes 9 are divided into a first reserved hole 91, a second reserved hole 92 and a third reserved hole 93;
the first preformed hole 91 is positioned at the bottom of the prefabricated wall panel 1 and is used for being connected with the ground through bolts;
the second preformed holes 92 are positioned at both sides of the prefabricated wall panel 1, and can be connected by bolts when the prefabricated wall panel 1 is transversely discharged;
the third preformed holes 93 are located on the front and rear surfaces of the prefabricated wall boards 1, firstly, the prefabricated wall board 1 closest to the wall surface is partially provided with the third preformed holes 93 for bolt fixation with the wall surface, and the longitudinally discharged prefabricated wall boards 1 are all fixed by bolts through the third preformed holes 93.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (7)
1. The magnesia cement precast slab is characterized by comprising a precast wallboard (1), wherein the top of the precast wallboard (1) is fixedly connected with a reinforcing steel bar (2), a wall surface fixing plate (3) is arranged on the rear side of the precast wallboard (1), and the precast wallboard (1) is fixed on the surface of the wall surface fixing plate (3);
one side of the prefabricated wallboard (1) is fixedly connected with a limiting block (4), the surface of the wall surface fixing plate (3) is fixedly connected with a limiting rod (5), the limiting block (4) is sleeved on the surface of the limiting rod (5), the other side of the prefabricated wallboard (1) is provided with a mounting hole (6) matched with the limiting block (4), and the surface of the prefabricated wallboard (1) is provided with a plurality of preformed holes (9);
two limit grooves (7) are formed in the side wall surface of the prefabricated wallboard (1), the two limit grooves (7) are symmetrically arranged by taking the side wall central line of the prefabricated wallboard (1) as a symmetrical axis, a fixed clamping plate (8) is arranged between the two prefabricated wallboards (1), and the fixed clamping plate (8) is respectively inserted into the two adjacent limit grooves (7) on the two prefabricated wallboards (1);
the preformed holes (9) comprise first preformed holes (91), second preformed holes (92) and third preformed holes (93), wherein the first preformed holes (91) are used for connecting the prefabricated wall boards (1) with the ground, the second preformed holes (92) are used for connecting the prefabricated wall boards (1), and the third preformed holes (93) are used for connecting the prefabricated wall boards (1) with the wall surfaces or the prefabricated wall boards (1);
the magnesia cement precast slab comprises the following raw materials in parts by weight:
2-5 parts of active magnesium oxide,
2-5 parts of common cement,
2-4 parts of fly ash,
30-50 parts of dry sand,
45-55 parts of broken stone.
2. A magnesia cement precast slab as defined in claim 1, wherein: the active magnesium oxide is light burned magnesium oxide.
3. A magnesia cement precast slab as defined in claim 1, wherein: the ordinary cement is 32.5-grade ordinary Portland cement, the fly ash is test-grade first-grade fly ash, the dry sand is natural sand after passing through a screen with the aperture of 2mm, the broken stone is natural rock, and the particle size is larger than 4.75mm.
4. A method for manufacturing a magnesia cement precast slab, which is used for preparing the magnesia cement precast slab as defined in any one of claims 1 to 3, and is characterized in that: the method comprises the following steps:
step one: active magnesia cement formulation
The mass ratio of the active magnesium oxide to the common cement is 1: (0.5-2) and uniformly mixing and stirring the materials according to the design proportion;
step two: blending and layering press forming
After the preparation according to a certain mixing proportion, adding water into the mixed dry material, stirring, sequentially layering the mixed material, filling the mixed material into a mould, and finally pressing and forming by a hydraulic press;
step three: demolding and carbonization maintenance
And (3) demolding by using a demolding machine, and immediately placing the demolding machine into a carbonization box for carbonization maintenance.
5. The method for manufacturing the magnesia cement precast slab, as defined in claim 4, is characterized in that: the second step is specifically as follows:
firstly, selecting a mixing ratio according to the designed weight, and mixing the active magnesia cement, the fly ash, the dry sand and the crushed stone to form a mixed dry material;
secondly, sequentially placing the raw materials into a small stirrer for stirring for 5 minutes; then adding water into the stirred mixed dry material, and continuing stirring for 5 minutes to form a mixed material;
and thirdly, selecting and sequentially layering and filling the stirred mixture into a mould, and finally pressing and forming by a hydraulic press.
6. The method for manufacturing the magnesia cement precast slab, as defined in claim 5, is characterized in that: the water adding amount is 20-30% of the weight of the mixture.
7. The method for manufacturing the magnesia cement precast slab, as defined in claim 4, is characterized in that: the size of the die is 4200 multiplied by 500 multiplied by 150mm, and the bottom and the peripheral side surfaces in the die are uniformly coated with engine oil;
the hydraulic press is pressed and formed at the speed of 0.2kN/s, and is stopped when the speed is 45-60 kN;
the carbonization environment is 50-80% of humidity, 15-30 ℃ of temperature and 10-30% of concentration of CO 2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210923342.5A CN115490492B (en) | 2022-08-02 | 2022-08-02 | Magnesia cement precast slab, manufacturing method thereof and connecting structure |
Applications Claiming Priority (1)
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