CN114907044B - Modified recycled brick slag and recycled wet-mixed mortar - Google Patents
Modified recycled brick slag and recycled wet-mixed mortar Download PDFInfo
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- CN114907044B CN114907044B CN202210523577.5A CN202210523577A CN114907044B CN 114907044 B CN114907044 B CN 114907044B CN 202210523577 A CN202210523577 A CN 202210523577A CN 114907044 B CN114907044 B CN 114907044B
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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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1037—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B28/04—Portland 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application relates to the field of construction waste regeneration, and particularly discloses modified regenerated brick slag and regenerated wet-mixed mortar. The modified recycled brick slag comprises the following raw materials in parts by weight: 600-800 parts of regenerated brick slag, 40-60 parts of molecular sieve, 3-5 parts of high-viscosity adhesive, 30-40 parts of hydrophobic chemical fiber and 300-500 parts of poly alpha methyl styrene resin; the modified recycled brick slag can be used for preparing recycled wet-mixed mortar. The regenerated wet-mixed mortar has the advantages of low water absorption rate, high strength, good crack resistance and good thermal insulation performance.
Description
Technical Field
The application relates to the field of construction waste regeneration, in particular to modified regenerated brick slag and regenerated wet-mixed mortar.
Background
The waste building can generate more construction waste, namely waste concrete blocks, waste brick slag, waste steel bars and the like, so that the regeneration of the construction waste becomes a research hotspot, the construction of a novel building is carried out by utilizing the regenerated construction waste, and the construction resources are greatly saved.
In the related technology, the regenerated wet-mixed mortar is disclosed, and comprises cement, fly ash, fine sand, a thickening agent, regenerated brick slag and water, wherein the regenerated brick slag is prepared by crushing brick slag in construction waste; the preparation method of the regenerated wet-mixed mortar comprises the following steps: stirring cement, fly ash, fine sand, a thickening agent, recycled brick slag and water until the materials are uniformly mixed.
In view of the above-mentioned related technologies, the inventors believe that the recycled wet-mixed mortar directly adopts recycled brick slag, and the recycled brick slag has low strength and high water absorption due to many cracks, and the recycled wet-mixed mortar prepared from the recycled brick slag is more likely to have problems of reduced strength and increased water absorption in the later period.
Disclosure of Invention
In order to solve the problems of low strength and high water absorption of the recycled brick slag, the application provides modified recycled brick slag and recycled wet-mixed mortar.
In a first aspect, the application provides a modified recycled brick slag, which adopts the following technical scheme:
the modified recycled brick slag is prepared from the following raw materials in parts by weight: 600-800 parts of regenerated brick slag, 40-60 parts of molecular sieve, 3-5 parts of high-viscosity adhesive, 30-40 parts of hydrophobic chemical fiber and 300-500 parts of poly alpha methyl styrene resin.
By adopting the technical scheme, the molecular sieve is an aluminosilicate compound with cubic lattices, the interior of the aluminosilicate compound contains a uniform microporous structure, and the molecular sieve with the particle size within the micron and millimeter range is adopted, so that the molecular sieve can be embedded into gaps of brick slag, and the pore size in the molecular sieve can play a role in heat insulation of the brick slag while the molecular sieve plays a role in supporting the brick slag; the high-viscosity adhesive can adhere the hydrophobic chemical fiber to the surface of the molecular sieve, so that the hydrophobic chemical fiber not only prevents external substances from entering micropores of the molecular sieve, but also increases the specific surface area and roughness of the molecular sieve, and the molecular sieve can be firmly adhered to the poly-alpha-methylstyrene resin; the poly-alpha-methyl styrene resin is high-fluidity and high-viscosity resin, the poly-alpha-methyl styrene resin is added into the regenerated brick slag, the poly-alpha-methyl styrene resin flows and fills gaps of the brick slag, the molecular sieve is adhered to the cracks or the surfaces of the brick slag, and after the poly-alpha-methyl styrene resin is solidified, the gaps of the brick slag are filled, so that the cracks of the brick slag are reduced, the strength is increased, and the water absorption rate is reduced.
Optionally, the particle size of the regenerated brick slag is 0-5mm, and the particle size of the molecular sieve is 500nm-2um.
By adopting the technical scheme, the particle size of the regenerated brick slag is limited, on one hand, compared with the regenerated brick slag with large particle size, the regenerated brick slag with small particle size can be fully modified, so that the gaps of the regenerated brick slag are reduced, the strength is improved, and the water absorption rate is reduced; on the other hand, the recycled brick slag with small particle size can be used as fine aggregate in mortar or concrete.
The molecular sieve with the particle size of 500nm-2um can be just filled into gaps of the regenerated brick slag, so that the gaps of the regenerated brick slag are filled, the strength of the regenerated brick slag is increased, and the water absorption of the regenerated brick slag is reduced.
Optionally, the molecular sieve is one or more of an X-type molecular sieve and a Y-type molecular sieve.
By adopting the technical scheme, the types of the conventional molecular sieves comprise an A-type molecular sieve, an X-type molecular sieve and a Y-type molecular sieve, the A-type molecular sieve is in a tetragonal crystal system, and the X-type molecular sieve and the Y-type molecular sieve are in an octagonal crystal system, so that the strength of the X-type molecular sieve and the strength of the Y-type molecular sieve are higher than that of the A-type molecular sieve, and the modified regenerated brick slag obtained by modifying the X-type molecular sieve and the Y-type molecular sieve is higher in strength.
Optionally, the hydrophobic chemical fiber is one or more of polyester fiber, polyamide fiber, polypropylene fiber and polyvinyl chloride fiber.
By adopting the technical scheme, the polyester fibers, the polyamide fibers, the polypropylene fibers and the polyvinyl chloride fibers are all chemical fibers, so that the polyester fibers, the polyamide fibers, the polypropylene fibers and the polyvinyl chloride fibers are high in strength, high in toughness and good in ageing resistance; and the polyester fiber, the polyamide fiber, the polypropylene fiber and the polyvinyl chloride fiber are all hydrophobic, when the modified regenerated brick slag is mixed with other water-containing raw materials, the free molecular sieve is further close to the brick slag filled with the poly-alpha-methyl styrene resin due to the surface hydrophobic effect, and is filled in gaps of the brick slag or adsorbed on the surface of the brick slag, so that the strength of the brick slag is enhanced.
Optionally, the high-viscosity adhesive is one of a heat-resistant epoxy adhesive, a silicone adhesive and a phenolic resin adhesive.
By adopting the technical scheme, the heat-resistant epoxy glue, the organic silicon glue and the phenolic resin glue are all adhesives which are difficult to be compatible with water, so when the modified brick slag is mixed with other water-containing raw materials, the hydrophobic chemical fiber can still be tightly bonded on the surface of the molecular sieve, and the color of mortar or concrete cannot be influenced when the modified brick slag is prepared into the mortar or concrete in the later period; the high-viscosity adhesive is high-temperature-resistant adhesive and can bear various high-temperature environments of post processing.
Optionally, the modified recycled brick slag is prepared by the following method:
step 1, uniformly spraying a high-viscosity adhesive on the surface of a molecular sieve; then uniformly mixing the molecular sieve sprayed with the high-viscosity adhesive with the hydrophobic chemical fiber and drying; removing redundant hydrophobic chemical fibers to prepare the modified molecular sieve;
and 2, uniformly mixing the modified molecular sieve, the poly-alpha-methylstyrene resin and the regenerated brick slag at the temperature of 95-120 ℃, and drying the regenerated brick slag to obtain the modified brick slag.
By adopting the technical scheme, in the step 1, the hydrophobic chemical fiber is bonded on the surface of the molecular sieve by using the high-viscosity adhesive, so that micropores on the molecular sieve are shielded; removing redundant hydrophobic chemical fibers to prepare a modified molecular sieve; in the step 2, the modified molecular sieve can more easily enter gaps of the brick slag under the carrying of the poly-alpha methyl styrene resin, and the regenerated brick slag gaps are filled, and meanwhile, the regenerated brick slag is ensured to have enough strength.
Optionally, in the step 2, the mixing mode of the modified molecular sieve, the poly-alpha-methylstyrene resin and the recycled brick slag is as follows: adding the molten poly-alpha-methyl styrene resin into the modified molecular sieve and the regenerated brick slag at a uniform speed, and stirring uniformly.
By adopting the technical scheme, the poly-alpha-methylstyrene resin in a molten state is uniformly added into the modified molecular sieve and the regenerated brick slag, so that the poly-alpha-methylstyrene resin can be fully filled into gaps of the regenerated brick slag, the strength of the regenerated brick slag is enhanced, and the water absorption of the regenerated brick slag is reduced.
In a second aspect, the application provides a regenerated wet-mixed mortar and a preparation method thereof, and the following technical scheme is adopted: the regenerated wet-mixed mortar is prepared from the following raw materials in parts by weight: 180-250 parts of cement, 80-100 parts of fly ash, 400-600 parts of natural river sand, 700-900 parts of modified recycled brick slag, 8-15 parts of water reducing agent, 1-3 parts of thickening agent and 250-300 parts of water; all the raw materials are the same on the basis of the recycled brick slag.
By adopting the technical scheme, the wet-mixed mortar doped with the modified recycled brick slag has the advantages of low water absorption, high strength, good crack resistance and good thermal insulation performance, and completely makes up for the defects of recycled wet-mixed mortar prepared from common brick slag.
Optionally, the regenerated wet-mixed mortar is prepared by the following method:
stirring and mixing the modified recycled brick slag, cement, fly ash, natural river sand, a water reducing agent, a thickening agent and water at the speed of 500-800 r/min to prepare the recycled wet-mixed mortar.
By adopting the technical scheme, the modified recycled brick slag, the cement, the fly ash, the natural river sand, the water reducing agent, the thickening agent and the water are mixed and stirred at the stirring speed higher than that of the conventional mortar stirring, so that the free modified molecular sieve in the modified recycled brick slag is continuously drawn to the recycled brick slag due to the hydrophobic effect in the stirring process, and the strength of the recycled brick slag is further enhanced.
In summary, the present application has the following beneficial effects:
1. the molecular sieve enters gaps of the brick slag, so that the strength of the brick slag is improved; the hydrophobic chemical fiber is adhered on the surface of the molecular sieve, so that the firm adhesion between the molecular sieve and the poly-alpha-methylstyrene resin is increased; the poly-alpha-methylstyrene resin flows and fills gaps of the brick slag, the molecular sieve is adhered to cracks or surfaces of the brick slag, and the gaps of the brick slag are filled after the poly-alpha-methylstyrene resin is solidified, so that the cracks of the brick slag are reduced, the strength is increased, and the water absorption rate is reduced;
2. the molecular sieve has a micropore structure, so that after the molecular sieve is embedded into gaps of the brick slag, the micropore in the molecular sieve can improve the heat insulation performance of the brick slag while the molecular sieve plays a supporting role in the brick slag;
3. the wet-mixed mortar doped with the modified recycled brick slag has the advantages of low water absorption, high strength, good crack resistance and good thermal insulation performance, and completely makes up for the defects of recycled wet-mixed mortar prepared from common brick slag.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
The method for preparing the regenerated wet-mixed mortar comprises the following steps: the cement can be Portland cement of various types; the water reducing agent can be selected from mortar sold in the market; the thickening agent can be selected from mortar sold in the market; the length of the hydrophobic chemical fiber is 500nm-2 μm; other materials are commercially available.
Preparation example of modified recycled brick slag
Preparation example 1
The preparation method of the modified recycled brick slag comprises the following steps:
step 1, uniformly spraying 3g 801AB epoxy resin adhesive on the surface of 60g of a 13X type molecular sieve with the particle size of 500 nm; then uniformly mixing the 13X type molecular sieve sprayed with 801AB epoxy resin glue with 40g of polyester fiber with the length of 1 mu m, and drying for 24 hours at room temperature; blowing out the redundant polyester fibers by using a blower to prepare a modified molecular sieve;
and 2, melting 300g of poly alpha methyl styrene resin at 100 ℃ to form a liquid state, uniformly adding the liquid poly alpha methyl styrene resin into a mixture of the modified molecular sieve and 600g of regenerated brick slag, wherein the adding time of the poly alpha methyl styrene resin is 30min, stirring the modified molecular sieve and the regenerated brick slag at the temperature of 100 ℃ at the speed of 500rpm/min while adding, flattening and airing the mixture on a grid plate after stirring, and drying the mixture to obtain the modified brick slag.
Preparation example 2
The preparation method of the modified recycled brick slag comprises the following steps:
step 1, uniformly spraying 5g 801AB epoxy resin adhesive on the surface of 40g of a 13X type molecular sieve with the particle size of 500 nm; then uniformly mixing the 13X type molecular sieve sprayed with 801AB epoxy resin glue with 30g of polyester fiber with the length of 1 mu m, and drying for 24 hours at room temperature; blowing out the redundant polyester fibers by using a blower to prepare the modified molecular sieve;
and 2, melting 500g of poly alpha methyl styrene resin to be liquid at 100 ℃, uniformly adding the liquid poly alpha methyl styrene resin into a mixture of the modified molecular sieve and 800g of regenerated brick slag, wherein the adding time of the poly alpha methyl styrene resin is 30min, stirring the modified molecular sieve and the regenerated brick slag at the temperature of 100 ℃ at the speed of 500rpm/min while adding, flattening and airing the mixture on a grid plate after stirring is finished, and drying the mixture to obtain the modified brick slag.
Preparation example 3
The preparation method of the modified recycled brick slag comprises the following steps:
step 1, uniformly spraying 4g 801AB epoxy resin adhesive on the surface of 50g of a 13X type molecular sieve with the particle size of 500 nm; then uniformly mixing the 13X type molecular sieve sprayed with 801AB epoxy resin adhesive with 35g of polyester fiber with the length of 1 mu m, and drying at room temperature for 24 hours; blowing out the redundant polyester fibers by using a blower to prepare the modified molecular sieve;
and 2, melting 400g of poly alpha methyl styrene resin into a liquid state at the temperature of 100 ℃, uniformly adding the liquid poly alpha methyl styrene resin into a mixture of the modified molecular sieve and 700g of regenerated brick slag, wherein the adding time of the poly alpha methyl styrene resin is 30min, stirring the modified molecular sieve and the regenerated brick slag at the temperature of 100 ℃ at the speed of 500rpm/min while adding, flattening and airing the mixture on a grid plate after stirring is finished, and drying the mixture to obtain the modified brick slag.
Preparation example 4
The difference from preparation example 3 is that: equal weight of polyester fibers was replaced with equal weight of polypropylene fibers.
Preparation example 5
The difference from preparation example 3 is that: equal weight of 801AB epoxy glue was replaced with equal weight of 903AB silicone gum.
Preparation example 6
The difference from preparation example 3 is that: equal weight of 13X type molecular sieve was replaced with equal weight of 4A type molecular sieve.
Preparation example 7
The difference from preparation example 3 is that: the method of step 2 is different;
the method comprises the following specific steps: stirring and mixing 400g of poly alpha methyl styrene resin, a modified molecular sieve and 700g of regenerated brick slag at the speed of 500rpm/min at the temperature of 100 ℃, spreading and airing the mixture on a grid plate after stirring is finished, and drying the mixture to obtain the modified brick slag.
Comparative preparation example 1
The difference from preparation example 3 is that: no 13X type molecular sieve was added in step 1.
Comparative preparation example 2
The difference from preparation example 3 is that: no 801AB epoxy glue was added in step 1.
Comparative preparation example 3
The difference from preparation example 3 is that: in step 1, no polyester fiber was added.
Comparative preparation example 4
The difference from preparation example 3 is that: no polyalphamethylstyrene resin is added in step 1.
Examples of regenerating a Wet-mix mortar
Example 1
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
800g of modified recycled brick slag prepared in preparation example 1, 200g of PO42.5 cement, 90g of fly ash, 500g of natural river sand, 12g of SSJS polycarboxylic acid water reducer, 2g of carboxylic acid thickener and 270g of water are stirred for 10min at the speed of 600r/min, and recycled wet-mixed mortar is prepared.
Example 2
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 1 is that: the modified recycled brick slag of the same weight prepared in preparation example 1 was replaced with the modified recycled brick slag of the same weight prepared in preparation example 2.
Example 3
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 1 is that: the modified recycled brick slag of the same weight prepared in preparation example 1 was replaced with the modified recycled brick slag of the same weight prepared in preparation example 3.
Example 4
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 3 is that: the modified recycled brick slag of the same weight as that prepared in preparation example 3 was replaced with the modified recycled brick slag of the same weight as that prepared in preparation example 4.
Example 5
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 3 is that: the modified recycled brick slag of the same weight as that prepared in preparation example 3 was replaced with the modified recycled brick slag of the same weight as that prepared in preparation example 5.
Example 6
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 3 is that: the modified recycled brick slag with the same weight as that prepared in preparation example 3 was replaced with the modified recycled brick slag with the same weight as that prepared in preparation example 6.
Example 7
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 3 is that: the modified recycled brick slag of the same weight prepared in preparation example 3 was replaced with the modified recycled brick slag of the same weight prepared in preparation example 7.
Example 8
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 3 is that: the stirring speeds are different;
the method comprises the following specific steps: 800g of modified recycled brick slag prepared in example 3, 200g of PO42.5 cement, 90g of fly ash, 500g of natural river sand, 12g of SSJS polycarboxylic acid water reducer, 2g of carboxylic acid thickener and 270g of water are stirred for 10min at the speed of 100r/min to prepare recycled wet-mixed mortar.
Comparative example 1
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 3 is that: the modified recycled brick slag of the same weight prepared in preparation example 3 was replaced with the modified recycled brick slag of the same weight prepared in comparative preparation example 1.
Comparative example 2
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 3 is that: the modified recycled brick slag of the same weight prepared in preparation example 3 was replaced with the modified recycled brick slag of the same weight prepared in comparative preparation example 2.
Comparative example 3
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 3 is that: the modified recycled brick slag of the same weight prepared in preparation example 3 was replaced with the modified recycled brick slag of the same weight prepared in comparative preparation example 3.
Comparative example 4
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 3 is that: the modified recycled brick slag of the same weight prepared in preparation example 3 was replaced with the modified recycled brick slag of the same weight prepared in comparative preparation example 4.
Comparative example 5
The preparation method of the regenerated wet-mixed mortar comprises the following steps:
the difference from example 3 is that: replacing the modified recycled brick slag with the same weight with the recycled brick slag with the same weight.
Performance test
The regenerated wet-mixed mortar prepared in the embodiments 1 to 8 and the comparative examples 1 to 5 is subjected to performance test, the detection indexes are 14d tensile bonding strength, water absorption, 28d flexural strength, 28d compressive strength, 28d seepage pressure resistance and heat conductivity coefficient, and the detection of the 14d tensile bonding strength, the water absorption and the 28d compressive strength refers to JGJ70-2009 'test method standard for basic performance of building mortar'; the 28d flexural strength is detected according to GB177-85 'detection method for cement mortar strength'; 28d, the seepage resistance pressure refers to GBT25181-2019 national Standard for ready-mixed mortar; the detection of the heat conductivity coefficient refers to GBT20473-2006 building thermal insulation mortar standard; the test results are shown in table 1;
TABLE 1
By combining examples 1, 2 and 3, it can be seen that the wet-mixed mortars of examples 1, 2 and 3 are prepared by respectively adopting the modified recycled brick slag of preparation examples 1, 2 and 3, and the modified recycled brick slag of examples 1, 2 and 3 has better properties, so that the prepared wet-mixed mortars have high 14d tensile bonding strength, low water absorption, high 28d flexural strength, high 28d compressive strength, high 28d seepage pressure resistance and low thermal conductivity; and the raw material proportion in the preparation example 3 is the optimal proportion, so that the performances of the wet-mixed mortar prepared in the example 3 are better than those of the wet-mixed mortars prepared in the examples 1 and 2.
By combining example 3 and example 4, it can be seen that the raw material used in preparation example 3 in example 3 is polyester fiber, and the raw material used in preparation example 4 in example 4 is polypropylene fiber; however, the values of 14d tensile bond strength, water absorption, 28d flexural strength, 28d compressive strength, 28d seepage pressure resistance and thermal conductivity of the wet-mixed mortars prepared in the embodiment 3 and the embodiment 4 are all relatively close, so that the wet-mixed mortar with relatively good performance can be prepared by adopting the polypropylene fibers or the polyester fibers.
Combining example 3 with example 5, it can be seen that the raw material used in preparation example 3 in example 3 is 801AB epoxy resin adhesive, and the raw material used in preparation example 5 in example 5 is 903AB organic silica gel; however, the 14d tensile bond strength, the water absorption, the 28d flexural strength, the 28d compressive strength, the 28d seepage pressure resistance and the thermal conductivity of the wet-mixed mortar prepared in the embodiments 3 and 5 are all relatively close to each other, so that the wet-mixed mortar with relatively good performance can be prepared by adopting 903AB organic silica gel or 801AB epoxy resin adhesive.
Combining example 3 and example 6, it can be seen that the starting material used in preparation 3 in example 3 is type 13X molecular sieve and the starting material used in preparation 6 in example 6 is type 4A molecular sieve; however, the wet-mixed mortar prepared in example 3 has higher 14d tensile bond strength, lower water absorption, higher 28d flexural strength, higher 28d compressive strength, higher 28d permeation pressure resistance and lower thermal conductivity than the wet-mixed mortar prepared in example 6, and the wet-mixed mortar prepared in example 3 has better performance than the wet-mixed mortar prepared in example A.
Combining example 3 and example 7, it can be seen that the modified recycled brick slag in example 3 is prepared by uniformly adding liquid poly-alpha-methylstyrene resin into the mixture of modified molecular sieve and recycled brick slag, and stirring while adding; the preparation method of the modified recycled brick slag in example 7 is that poly-alpha methyl styrene resin, modified molecular sieve and recycled brick slag are stirred at the same time under the temperature condition of 100 ℃; compared with the wet-mixed mortar prepared in the embodiment 7, the wet-mixed mortar prepared in the embodiment 3 has high 14d tensile bonding strength, low water absorption, high 28d flexural strength, high 28d compressive strength, high 28d seepage pressure resistance and low heat conductivity coefficient; therefore, the production method of example 3 is superior to that of example 7.
By combining the example 3 and the example 8, it can be seen that the stirring speed is 600r/min when the wet-mixed mortar is prepared in the example 3, the stirring speed is 100r/min when the wet-mixed mortar is prepared in the example 8, and the performances of the wet-mixed mortar prepared in the example 3 are better than those of the wet-mixed mortar prepared in the example 8, so that the rapid stirring is beneficial to the better performances of the modified recycled brick slag when the wet-mixed mortar is prepared.
Combining comparative examples 1, 4 and example 3, it can be seen that comparative example 1 does not add the 13X type molecular sieve and comparative example 4 does not add the poly α methylstyrene resin, compared to example 3, and therefore the wet-mixed mortars prepared in comparative example 1 and comparative example 4 have low 14d tensile bond strength, high water absorption, low 28d flexural strength, low 28d compressive strength, and low 28d permeation pressure.
By combining comparative examples 2, 3 and example 3, it can be seen that, compared with example 3, 801AB epoxy resin glue is not added in comparative example 2, and polyester fiber is not added in comparative example 3, so that the micropores on the modified recycled brick slag in comparative example 2 and comparative example 3 are not well protected; therefore, the wet-mixed mortar prepared in comparative example 2 and comparative example 3 has high thermal conductivity and poor heat insulation performance.
By combining comparative example 5 and example 3, it can be seen that, compared with example 3, the regenerated brick slag directly adopted in comparative example 5 has low hardness and large water absorption, so that the wet-mixed mortar prepared in comparative example 5 has low 14d tensile bond strength, high water absorption, low 28d flexural strength, low 28d compressive strength, small 28d seepage pressure resistance and high thermal conductivity compared with the wet-mixed mortar prepared in example 3.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The modified recycled brick slag is characterized by being prepared from the following raw materials in parts by weight: 600-800 parts of regenerated brick slag, 40-60 parts of molecular sieve, 3-5 parts of high-viscosity adhesive, 30-40 parts of hydrophobic chemical fiber and 300-500 parts of poly-alpha-methylstyrene resin;
the modified recycled brick slag is prepared by the following method:
step 1, uniformly spraying a high-viscosity adhesive on the surface of a molecular sieve; then uniformly mixing the molecular sieve sprayed with the high-viscosity adhesive with the hydrophobic chemical fiber and drying; removing redundant hydrophobic chemical fibers to prepare the modified molecular sieve;
and 2, uniformly mixing the modified molecular sieve, the poly-alpha-methylstyrene resin and the regenerated brick slag at the temperature of 95-120 ℃, and drying the mixture to obtain the modified brick slag.
2. The modified recycled brick slag of claim 1, wherein the grain size of the recycled brick slag is 0-5mm, and the grain size of the molecular sieve is 500nm-2um.
3. The modified recycled brick slag of claim 1, wherein the molecular sieve is one or more of an X-type molecular sieve and a Y-type molecular sieve.
4. The modified recycled brick slag of claim 1, wherein the hydrophobic chemical fiber is one or more of polyester fiber, polyamide fiber, polypropylene fiber and polyvinyl chloride fiber.
5. The modified recycled brick slag of claim 1, wherein the high viscosity adhesive is one of a heat resistant epoxy adhesive, a silicone adhesive and a phenolic resin adhesive.
6. The modified recycled brick slag of claim 1, wherein in the step 2, the modified molecular sieve, the poly-alpha-methylstyrene resin and the recycled brick slag are mixed in the following way: adding the molten poly-alpha-methyl styrene resin into the modified molecular sieve and the regenerated brick slag at a uniform speed, and stirring uniformly.
7. The regenerated wet-mixed mortar is characterized by being prepared from the following raw materials in parts by weight: 180-250 parts of cement, 80-100 parts of fly ash, 400-600 parts of natural river sand, 700-900 parts of modified recycled brick slag, 8-15 parts of water reducing agent, 1-3 parts of thickening agent and 250-300 parts of water; all the raw materials are same in reference, and the regenerated brick slag is taken as a reference; the modified recycled brick slag is the modified recycled brick slag of any one of claims 1 to 6.
8. The recycled wet-mixed mortar of claim 7, which is prepared by the following method:
stirring and mixing the modified recycled brick slag, cement, fly ash, natural river sand, a water reducing agent, a thickening agent and water at the speed of 500-800 r/min to prepare the recycled wet-mixed mortar.
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| JP4993636B2 (en) * | 2010-06-03 | 2012-08-08 | 株式会社熊野技建 | Recycled crushed stone recycling method |
| CN110357549A (en) * | 2019-08-01 | 2019-10-22 | 深圳市嘉达高科产业发展有限公司 | A kind of construction refuse regenerated brick and preparation method thereof |
| CN112608053A (en) * | 2020-12-18 | 2021-04-06 | 中建西部建设北方有限公司 | Modified aggregate, preparation method and concrete using modified aggregate |
| CN113024195A (en) * | 2021-03-12 | 2021-06-25 | 江苏洋河新城新材料有限责任公司 | Wet-mixed mortar using recycled aggregate and preparation method thereof |
| CN114105540B (en) * | 2021-12-11 | 2022-08-30 | 武汉昌华汇鑫建材有限公司 | Recycled concrete and preparation method thereof |
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