CN116082003A - Machine-made sand recycled concrete of composite floor slab member and preparation method thereof - Google Patents
Machine-made sand recycled concrete of composite floor slab member and preparation method thereof Download PDFInfo
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- CN116082003A CN116082003A CN202310158288.4A CN202310158288A CN116082003A CN 116082003 A CN116082003 A CN 116082003A CN 202310158288 A CN202310158288 A CN 202310158288A CN 116082003 A CN116082003 A CN 116082003A
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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
- C04B28/04—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
- C04B2201/50—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 machine-made sand recycled concrete of a composite floor slab member and a preparation method thereof, and the compressive strength of the prepared recycled concrete for 28 days is more than or equal to 33MPa. The prepared machine-made sand and the recycled coarse aggregate have good economic value and ecological value, the preparation method provided by the invention is simple and feasible, the operation control is convenient, the preparation efficiency and the finished product qualification rate are high, and the prepared machine-made sand can replace the second-class sand for use and has good mechanical strength and slump performance.
Description
Technical Field
The invention belongs to the technical field of prefabricated concrete and building materials, and particularly relates to machine-made sand recycled concrete of a composite floor slab member and a preparation method thereof.
Background
In recent years, the development of the house to industrialization and assembly is the urgent and necessary development direction of the innovative development and structure transformation of the present China house, and is also the development requirement for realizing green environmental protection and energy saving. To realize the assembled construction of the entire residential building, the problem of floor slab assembly is urgently needed to be solved. The use of composite floor elements is an effective way to solve floor assembly problems. The construction of the prefabricated bottom plate is generally realized by steam-cured concrete, and the steam-cured concrete has higher early strength.
The traditional building composite floor slab member mostly adopts a concrete structure, and the concrete generally consists of coarse aggregate, fine aggregate, cementing material, water and additive. At present, along with the development of economy, a large amount of construction waste is generated by dismantling waste buildings, resources are gradually exhausted due to the fact that natural sand is excessively mined, and the waste buildings and the natural sand are extremely pressurized to the environment and ecology. Meanwhile, the foundation construction projects of China are increasing, machine-made sand and recycled coarse aggregate obtained by treating construction waste are generated, the machine-made sand is used as construction sand instead of natural sand, and the recycled coarse aggregate is used as a trend to replace natural stone.
The machine-made sand is characterized in that the particles are in an irregular shape and most of the particles are in a sharp shape; the compressive strength is high, so that the concrete strength is guaranteed; the stone is hard, the specific surface area is larger than that of river sand, the binding performance is better, and the cement can form better binding effect. Therefore, the concrete prepared from the proper machine-made sand has better comprehensive performance, and is the first choice of concrete materials of the composite heat-insulation external wall panel component of the fabricated building.
CN112679155a discloses a special machine-made sand composite material for fabricated building composite floor slab member, said composite material is formed from 870-930 portions of coarse stone, 165-195 portions of fine stone, 490-520 portions of machine-made sand, 50-90 portions of medium sand, 380-420 portions of extra fine sand, 320-480 portions of cement, 80-100 portions of water and 4.5-6.5 portions of additive. The self-compacting concrete is prepared from machine-made sand and natural coarse aggregate, and has the advantages of good comprehensive performance, good durability and excellent mechanical properties. However, the patent adopts natural coarse aggregate, and with the development of the building industry and the promotion of green recycling economy, the regenerated coarse aggregate gradually reaches the brand-new corner in the building market. The cement mortar is a good substitute for natural coarse aggregate with the advantages of low price, good performance, high utilization of construction waste and the like.
The recycled coarse aggregate is characterized in that the surface of the recycled coarse aggregate is provided with adsorption mortar, and the adsorption mortar can reduce the apparent density, the water absorption rate, the compressive strength and the like of the recycled coarse aggregate in general cases, but the mechanical property and the durability of the concrete prepared from the recycled coarse aggregate can still meet the national standard requirements, so that the recycled coarse aggregate has better economic benefit and environmental protection benefit compared with natural stones.
CN110790547a provides a lightweight high-strength concrete doped with recycled aggregate, machine-made sand and stone powder, the raw materials of which comprise 350-450 parts of cement, 200-500 parts of recycled aggregate, 500-700 parts of machine-made sand, 100-400 parts of stone powder, 5-15 parts of water reducer, 100-300 parts of reinforcing agent and 100-00 parts of water. The invention also provides a preparation method and application of the light high-strength concrete. Through selecting proper materials and carrying out scientific proportioning, the concrete has the properties of low density and high strength which are difficult to be compatible. However, the patent does not mention the early strength of such concrete, which is a critical performance indicator for prefabricated components.
The mechanical properties of the concrete prepared from machine-made sand or recycled coarse aggregate can meet the design requirements. But to meet the problem of hoisting and transporting prefabricated parts, the early strength of the concrete needs to be ensured. Therefore, the machine-made sand recycled concrete with the composite floor slab member with high slump loss resistance is developed, has good mechanical comprehensive performance, good durability and excellent early and later strength, meets the market demand, has wide market value and application prospect, and has very important effect on promoting the further development of the machine-made sand recycled concrete material.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above and/or problems occurring in the prior art.
The invention aims to overcome the defects in the prior art and provide machine-made sand recycled concrete for composite floor slab members.
In order to solve the technical problems, the invention provides the following technical scheme: a machine-made sand recycled concrete for composite floor slab elements, comprising: the compressive strength of the recycled concrete is more than or equal to 33MPa.
Another object of the invention is to provide a method for preparing machine-made sand recycled concrete for composite floor slab members.
In order to solve the technical problems, the invention provides the following technical scheme: the preparation method of the machine-made sand recycled concrete of the composite floor slab member comprises the following steps:
preparing raw materials: preparing recycled coarse aggregate, machine-made sand, cement, fly ash, water and a water reducing agent;
cleaning coarse aggregate: washing the coarse aggregate with water;
pulping: weighing part of cement and water, stirring to form slurry, adding coarse aggregate and machine-made sand, and stirring and mixing;
continuing stirring: adding the rest cement, water and water reducer, and continuously stirring and uniformly mixing;
mould-forming and pre-curing: filling the evenly stirred concrete into an iron mold, and pre-curing at room temperature;
steaming: steaming the concrete, heating, preserving heat, and then cooling;
curing: and (5) removing the mould and curing the steamed concrete.
As a preferable scheme of the machine-made sand recycled concrete of the composite floor slab member, the invention comprises the following steps: in the preparation raw materials, the recycled coarse aggregate comprises the following components in weight: machine-made sand: and (3) cement: fly ash: water: water reducer=950 to 990:728 to 775:288 to 318:122 to 126: 172-190: 2.11 to 2.21.
As a preferable scheme of the machine-made sand recycled concrete of the composite floor slab member, the invention comprises the following steps: in the preparation raw materials, the particle size of the recycled coarse aggregate is 5-20mm, and the content of the adsorption mortar is 10-32%.
As a preferable scheme of the machine-made sand recycled concrete of the composite floor slab member, the invention comprises the following steps: the fineness modulus of the machine-made sand is 2.3-2.9, and the stone powder content is 5% -12%.
As a preferable scheme of the machine-made sand recycled concrete of the composite floor slab member, the invention comprises the following steps: the cement is ordinary silicate cement.
As a preferable scheme of the machine-made sand recycled concrete of the composite floor slab member, the invention comprises the following steps: the cement is P.O 42.5.5 cement, and SO thereof 3 The content of the additive is less than 2%, the content of chloride ions is less than 0.01%, and the additive is a polycarboxylic acid water reducer.
As a preferable scheme of the machine-made sand recycled concrete of the composite floor slab member, the invention comprises the following steps: the recycled coarse aggregate comprises the following components in percentage by weight: machine-made sand: and (3) cement: fly ash: water: water reducer = 960:760:298:124:181:2.14.
as a preferable scheme of the machine-made sand recycled concrete of the composite floor slab member, the invention comprises the following steps: in the steam curing, the temperature is raised to 40-90 DEG C
The invention has the beneficial effects that:
the invention simultaneously uses two green materials of machine-made sand and recycled coarse aggregate for preparing concrete, and has better economic value and ecological value. The machine-made sand recycled concrete material of the composite floor slab member and the preparation method thereof are provided, the preparation method is simple and feasible, the operation control is convenient, and the preparation efficiency and the finished product qualification rate are high; the machine-made sand composite material of the composite floor slab member prepared by the preparation method has good mechanical comprehensive performance, early strength can meet the requirement of hoisting early prefabricated members, and has good slump.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a diagram of a machine-made sand object used in example 1 of the present invention;
fig. 2 is a physical view of a composite floor slab made of recycled concrete prepared in example 1 of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
The preparation of the embodiment is carried out according to the following parts by weight: 960 parts of recycled coarse aggregate, 760 parts of machine-made sand, 298 parts of cement, 124 parts of fly ash, 181 parts of water and 2.14 parts of water reducer.
The grain diameter of the regenerated coarse aggregate is 5-20mm, and the content of the adsorption mortar is 21%; the grain diameter of the machine-made sand is 0.075-5mm, the fineness modulus is 2.7, and the stone powder content is 10%; the cement is 42.5 ordinary Portland cement; the fly ash is second-level dry fly ash; the water reducer is a polycarboxylic acid high-efficiency water reducer.
The steam cured concrete is prepared according to the following steps:
1) Washing coarse aggregate with water to make the surface of the coarse aggregate free of impurities such as mud, mud blocks and the like, and airing;
2) Weighing 50 parts of cement and 50 parts of water, adding the cement and the 50 parts of water into a stirrer to stir into slurry, then adding the treated coarse aggregate and machine-made sand, and stirring for 2 minutes;
3) Adding the rest cement, water and water reducer, and continuously stirring for 2 minutes;
4) Filling the concrete in the step 3) into an iron mold, and pre-culturing for 3 hours at room temperature;
5) Moving the concrete in the step 4) to a steam curing chamber, heating to 40 ℃ according to the heating rate of 10 ℃/hour, preserving heat for 6 hours, and then cooling to room temperature according to the cooling rate of 10 ℃/hour;
6) Removing the mould and carrying out standard maintenance for 7 and 28 days.
Example 2
The preparation of the embodiment is carried out according to the following parts by weight: 950 parts of recycled coarse aggregate, 728 parts of machine-made sand, 288 parts of cement, 122 parts of fly ash, 172 parts of water and 2.11 parts of water reducer.
The grain diameter of the regenerated coarse aggregate is 5-20mm, and the content of the adsorption mortar is 21%; the grain diameter of the machine-made sand is 0.075-5mm, the fineness modulus is 2.7, and the stone powder content is 10%; the cement is 42.5 ordinary Portland cement; the fly ash is second-level dry fly ash; the water reducer is a polycarboxylic acid high-efficiency water reducer.
The steam cured concrete is prepared according to the following steps:
1) Washing coarse aggregate with water to make the surface of the coarse aggregate free of impurities such as mud, mud blocks and the like, and airing;
2) Weighing 50 parts of cement and 50 parts of water, adding the cement and the 50 parts of water into a stirrer to stir into slurry, then adding the treated coarse aggregate and machine-made sand, and stirring for 2 minutes;
3) Adding the rest cement, water and water reducer, and continuously stirring for 2 minutes;
4) Filling the concrete in the step 3) into an iron mold, and pre-culturing for 3 hours at room temperature;
5) Moving the concrete in the step 4) to a steam curing chamber, heating to 40 ℃ according to the heating rate of 10 ℃/hour, preserving heat for 6 hours, and then cooling to room temperature according to the cooling rate of 10 ℃/hour;
6) Removing the mould and carrying out standard maintenance for 7 and 28 days.
Example 3
The preparation of the embodiment is carried out according to the following parts by weight: 990 parts of recycled coarse aggregate, 775 parts of machine-made sand, 318 parts of cement, 126 parts of fly ash, 190 parts of water and 2.21 parts of water reducer.
The grain diameter of the regenerated coarse aggregate is 5-20mm, and the content of the adsorption mortar is 21%; the grain diameter of the machine-made sand is 0.075-5mm, the fineness modulus is 2.7, and the stone powder content is 10%; the cement is 42.5 ordinary Portland cement; the fly ash is second-level dry fly ash; the water reducer is a polycarboxylic acid high-efficiency water reducer.
The steam cured concrete is prepared according to the following steps:
1) Washing coarse aggregate with water to make the surface of the coarse aggregate free of impurities such as mud, mud blocks and the like, and airing;
2) Weighing 50 parts of cement and 50 parts of water, adding the cement and the 50 parts of water into a stirrer to stir into slurry, then adding the treated coarse aggregate and machine-made sand, and stirring for 2 minutes;
3) Adding the rest cement, water and water reducer, and continuously stirring for 2 minutes;
4) Filling the concrete in the step 3) into an iron mold, and pre-culturing for 3 hours at room temperature;
5) Moving the concrete in the step 4) to a steam curing chamber, heating to 40 ℃ according to the heating rate of 10 ℃/hour, preserving heat for 6 hours, and then cooling to room temperature according to the cooling rate of 10 ℃/hour;
6) Removing the mould and carrying out standard maintenance for 7 and 28 days.
Example 4
The preparation of the embodiment is carried out according to the following parts by weight: 960 parts of recycled coarse aggregate, 760 parts of machine-made sand, 298 parts of cement, 124 parts of fly ash, 181 parts of water and 2.14 parts of water reducer.
The grain diameter of the regenerated coarse aggregate is 5-20mm, and the content of the adsorption mortar is 21%; the grain diameter of the machine-made sand is 0.075-5mm, the fineness modulus is 2.7, and the stone powder content is 10%; the cement is 42.5 ordinary Portland cement; the fly ash is second-level dry fly ash; the water reducer is a polycarboxylic acid high-efficiency water reducer.
The steam cured concrete is prepared according to the following steps:
1) Washing coarse aggregate with water to make the surface of the coarse aggregate free of impurities such as mud, mud blocks and the like, and airing;
2) Weighing 50 parts of cement and 50 parts of water, adding the cement and the 50 parts of water into a stirrer to stir into slurry, then adding the treated coarse aggregate and machine-made sand, and stirring for 2 minutes;
3) Adding the rest cement, water and water reducer, and continuously stirring for 2 minutes;
4) Filling the concrete in the step 3) into an iron mold, and pre-culturing for 3 hours at room temperature;
5) Moving the concrete in the step 4) to a steam curing chamber, heating to 60 ℃ according to the heating rate of 10 ℃/hour, preserving heat for 6 hours, and then cooling to room temperature according to the cooling rate of 10 ℃/hour;
6) Removing the mould and carrying out standard maintenance for 7 and 28 days.
Example 5
The preparation of the embodiment is carried out according to the following parts by weight: 960 parts of recycled coarse aggregate, 760 parts of machine-made sand, 298 parts of cement, 124 parts of fly ash, 181 parts of water and 2.14 parts of water reducer.
The grain diameter of the regenerated coarse aggregate is 5-20mm, and the content of the adsorption mortar is 31%; the grain diameter of the machine-made sand is 0.075-5mm, the fineness modulus is 2.5, and the stone powder content is 11.5%; the cement is 42.5 ordinary Portland cement; the fly ash is second-level dry fly ash; the water reducer is a polycarboxylic acid high-efficiency water reducer.
The steam cured concrete is prepared according to the following steps:
1) Washing coarse aggregate with water to make the surface of the coarse aggregate free of impurities such as mud, mud blocks and the like, and airing;
2) Weighing 50 parts of cement and 50 parts of water, adding the cement and the 50 parts of water into a stirrer to stir into slurry, then adding the treated coarse aggregate and machine-made sand, and stirring for 2 minutes;
3) Adding the rest cement, water and water reducer, and continuously stirring for 2 minutes;
4) Filling the concrete in the step 3) into an iron mold, and pre-culturing for 3 hours at room temperature;
5) Moving the concrete in the step 4) to a steam curing chamber, heating to 60 ℃ according to the heating rate of 10 ℃/hour, preserving heat for 6 hours, and then cooling to room temperature according to the cooling rate of 10 ℃/hour;
6) Removing the mould and carrying out standard maintenance for 7 and 28 days.
Example 6
The preparation of the embodiment is carried out according to the following parts by weight: 960 parts of recycled coarse aggregate, 760 parts of machine-made sand, 298 parts of cement, 124 parts of fly ash, 181 parts of water and 2.14 parts of water reducer.
The grain diameter of the regenerated coarse aggregate is 5-20mm, and the content of the adsorption mortar is 12%; the grain diameter of the machine-made sand is 0.075-5mm, the fineness modulus is 2.8, and the stone powder content is 7.5%; the cement is 42.5 ordinary Portland cement; the fly ash is second-level dry fly ash; the water reducer is a polycarboxylic acid high-efficiency water reducer.
The steam cured concrete is prepared according to the following steps:
1) Washing coarse aggregate with water to make the surface of the coarse aggregate free of impurities such as mud, mud blocks and the like, and airing;
2) Weighing 50 parts of cement and 50 parts of water, adding the cement and the 50 parts of water into a stirrer to stir into slurry, then adding the treated coarse aggregate and machine-made sand, and stirring for 2 minutes;
3) Adding the rest cement, water and water reducer, and continuously stirring for 2 minutes;
4) Filling the concrete in the step 3) into an iron mold, and pre-culturing for 3 hours at room temperature;
5) Moving the concrete in the step 4) to a steam curing chamber, heating to 60 ℃ according to the heating rate of 10 ℃/hour, preserving heat for 6 hours, and then cooling to room temperature according to the cooling rate of 10 ℃/hour;
6) Removing the mould and carrying out standard maintenance for 7 and 28 days.
Comparative example 1
This example was prepared with reference to example 1, with the difference from example 1 that: and (3) directly carrying out standard maintenance without a demolding process in the step (6).
Comparative example 2
This example was prepared with reference to example 1, with the difference from example 1 that: the stone powder content of the machine-made sand is 15%.
Example 7
The special machine-made sand composite materials for constructing the finished composite floor slabs prepared in examples 1 to 6 and comparative examples 1 and 2 were subjected to performance test, and the test results are shown in table 1.
The test method is described in GB/T50080-2016 Standard for test methods for Properties of common concrete mixtures and GB/T50081 2019 Standard for test methods for physical and mechanical Properties of concrete.
Table 1 performance data of machine-made sand composite materials for construction of final composite floor slabs prepared in examples 1 to 6 and comparative examples 1 and 2
| Project | Compressive strength (MPa) for 7 days | Compressive strength (MPa) for 28 days | Slump of slump |
| Example 1 | 24.2 | 35.6 | 140 |
| Example 2 | 23.6 | 34.2 | 135 |
| Example 3 | 23.4 | 34.4 | 135 |
| Example 4 | 25.6 | 34.7 | 140 |
| Example 5 | 26.3 | 33.6 | 135 |
| Example 6 | 24.8 | 35.2 | 145 |
| Comparative example 1 | 20.2 | 36.5 | 140 |
| Comparative example 2 | 20.5 | 31.2 | 130 |
The content of the mechanical sand powder used in the comparative example 1 and the examples 1-6 is in the range of 5-12%, the measured 28-day compressive strength is about 35MPa, the design requirement is met, and the 28-day compressive strength of the comparative example 2 only can barely meet the requirement of the standard strength value because the content of the stone powder exceeds the specified range, and meanwhile, the slump is reduced and the fluidity is poor because of the excessive stone powder; in the comparative example 1, the standard curing mode is adopted, and the method specified in the invention is not adopted, so that the 7-day compressive strength is obviously smaller than that of the example, and the requirement of the hoisting strength of the composite floor slab member can not be met. The special machine-made sand composite material for the composite floor slab member has better mechanical property and slump.
As can be seen from table 1, the raw material ratios provided in examples 1 to 3 are all capable of achieving the best compression and slump effects for the production of a dedicated machine-made sand composite material conforming to the respective definitions of the composite floor slab members, but the raw material ratios used in example 1 are preferred for the raw material ratios in my invention due to the differences in raw material ratios.
As can be seen from table 1, examples 4, 5, and 6 have the performance advantages of each other, and different performance adjustment can be achieved through different proportions of the raw materials, so that the applicability of the performance of the finished product in my invention is increased.
In the embodiment of the invention, 42.5 ordinary Portland cement is used in the adding implementation process, and under the condition that 42.5 ordinary Portland cement can be used according to the property of Portland cement, the effect of being capable of being used for most ordinary Portland cement exists.
As is clear from the comparison between example 1 and example 4, when the temperature is raised, the compression strength is raised in 7 days, the compression strength is lowered in 28 days, the early strength can be raised by adopting the steam curing mode in the early stage, but the development of the later strength is disadvantageous, when the temperature of the initial steam curing is raised, the energy consumption for heating is greatly increased, and 60 ℃ is the preferable curing temperature based on the aspects of performance and cost.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (9)
1. The machine-made sand recycled concrete of the composite floor slab member is characterized in that: the compressive strength of the recycled concrete for 28 days is more than or equal to 33MPa.
2. A preparation method of machine-made sand recycled concrete for composite floor slab members is characterized by comprising the following steps: the method comprises the following steps:
preparing raw materials: preparing recycled coarse aggregate, machine-made sand, cement, fly ash, water and a water reducing agent;
cleaning coarse aggregate: washing the coarse aggregate with water;
pulping: weighing part of cement and water, stirring to form slurry, adding coarse aggregate and machine-made sand, and stirring and mixing;
continuing stirring: adding the rest cement, water and water reducer, and continuously stirring and uniformly mixing;
mould-forming and pre-curing: filling the evenly stirred concrete into an iron mold, and pre-curing at room temperature;
steaming: steaming the concrete, heating, preserving heat, and then cooling;
curing: and (5) removing the mould and curing the steamed concrete.
3. The method for preparing machine-made sand recycled concrete of composite floor slab members according to claim 2, wherein: in the preparation raw materials, the recycled coarse aggregate comprises the following components in weight: machine-made sand: and (3) cement: fly ash: water: water reducer=950 to 990:728 to 775:288 to 318:122 to 126: 172-190: 2.11 to 2.21.
4. The method for preparing machine-made sand recycled concrete of composite floor slab members according to claim 2, wherein: in the preparation raw materials, the particle size of the recycled coarse aggregate is 5-20mm, and the content of the adsorption mortar is 10-32%.
5. The method for preparing machine-made sand recycled concrete of composite floor slab members according to claim 2, wherein: the fineness modulus of the machine-made sand is 2.3-2.9, and the stone powder content is 5% -12%.
6. The method for preparing machine-made sand recycled concrete of composite floor slab members according to claim 2, wherein: the cement is ordinary silicate cement.
7. The method for preparing machine-made sand recycled concrete of composite floor slab members according to claim 2, wherein: the cement is P.O 42.5.42.5 cement, and SO thereof 3 The content of the additive is less than 2%, the content of chloride ions is less than 0.01%, and the additive is a polycarboxylic acid water reducer.
8. A method of making machine-made sand recycled concrete for composite floor elements according to claim 2 or 3, characterized by: the recycled coarse aggregate comprises the following components in parts by weight: machine-made sand: and (3) cement: fly ash: water: water reducer = 960:760:298:124:181:2.14.
9. the method for preparing machine-made sand recycled concrete of composite floor slab members according to claim 2, wherein: in the steam curing, the temperature is raised to 40-90 ℃.
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