CN114380550B - Aggregate and preparation method and application thereof - Google Patents
Aggregate and preparation method and application thereof Download PDFInfo
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- CN114380550B CN114380550B CN202111627734.9A CN202111627734A CN114380550B CN 114380550 B CN114380550 B CN 114380550B CN 202111627734 A CN202111627734 A CN 202111627734A CN 114380550 B CN114380550 B CN 114380550B
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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
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
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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
- 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
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/10—Burned or pyrolised refuse
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an aggregate, a preparation method and application thereof, wherein the aggregate comprises the following preparation raw materials: cement, deposited beads, silica fume, garbage incinerator slag, an exciting agent, closed-cell vitrified micro bubbles and carbon fiber powder; the garbage incinerator slag consists of first particle garbage incinerator slag and second particle garbage incinerator slag; the fineness of the first granular garbage incinerator slag is 90-120 meshes; the fineness of the second granular garbage incinerator slag is 60-80 meshes. The invention combines the rehydration of the aggregate and the formation of the concrete slurry well when preparing the concrete, avoids the weak links of the aggregate and the slurry, is used for preparing the light high-strength concrete, and has good performance and advantages.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to aggregate, and a preparation method and application thereof.
Background
As a variety of light concrete, the high-strength light concrete not only ensures the strength of the concrete structure, but also provides an effective way for reducing the dead weight of the concrete structure. The inside of the aggregate used for the high-strength lightweight concrete is porous and has certain strength, and the dense natural aggregate is replaced by the pore body in the concrete, so that the aim of reducing the apparent density of the concrete material is fulfilled. The method for reducing the structural dead weight by using natural porous lightweight aggregate has a very long history, and Roman's palace dome which is constructed by using natural volcanic cinders as aggregate and spans 433 meters is still intact in ancient Roman period, which can be regarded as a prototype of modern high-strength lightweight concrete.
The high-strength light concrete has the following advantages:
1. the structural benefit is good. Under the condition of the same strength grade, the apparent density of the high-strength lightweight concrete is 20% -40% lower than that of the common concrete material, the specific strength of the high-strength lightweight concrete is greater than that of the common concrete structure, and the structural mass is reduced. Under the condition that the structural sections are the same, the structural bearing capacity can be improved due to the reduction of the dead weight of the high-strength light concrete.
2. The anti-seismic performance is strong. The high-strength lightweight concrete has the advantages of small apparent density, light structural mass, low elastic modulus and strong dynamic load bearing capacity. The earthquake force born by the earthquake load is small, the transmission speed of the vibration wave is slow, the self-vibration period of the structure is long, the absorption of impact energy is fast, and the damping effect is obvious.
3. Has good fire resistance. The high-strength lightweight concrete has low heat conductivity coefficient and large thermal resistance value, so that the transmission speed of temperature from the surface to the inside is greatly slowed down under the action of high temperature, and the steel bars can be protected. For the components with the same fire resistance grade, the thickness of the high-strength lightweight concrete slab can be reduced by 20 to 30 percent compared with that of the common concrete slab.
4. The durability is good. Because high-strength lightweight concrete has excellent bonding and interface transition areas between lightweight aggregate and mortar, and the interface transition areas are one of the important factors affecting the durability of concrete materials, the high-strength lightweight concrete has good permeability resistance, freezing resistance and resistance to various chemical attacks.
5. The economy is excellent. Although the high-strength lightweight aggregate concrete has high unilateral construction cost and common concrete with the same strength grade, the source is enlarged along with the improvement of the artificial lightweight aggregate production technology, the cost of the lightweight aggregate can be greatly reduced, the structural section is reduced, the dead weight of the structure is lightened, the use area is increased, the steel consumption is reduced, and the foundation construction cost is reduced, so that the high-strength lightweight aggregate concrete has remarkable comprehensive economic benefit.
In order to achieve the high-strength light-weight performance, the aggregate with excellent performance is needed, the pressure intensity of the traditional natural aggregate and the artificial haydite cylinder is generally below 10MPa, the high-strength light-weight concrete with more than C60 is difficult to prepare, and the application of the high-strength light-weight concrete in high-rise buildings and large-span bridges is limited.
Therefore, there is a need to develop an aggregate having high cylinder compaction.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the aggregate, which has high cylinder pressure intensity.
The invention also provides a preparation method of the aggregate.
The invention also provides application of the aggregate in concrete preparation.
Specifically, the first aspect of the invention provides an aggregate, which comprises the following preparation raw materials: cement, deposited beads, silica fume, garbage incinerator slag, an exciting agent, closed-cell vitrified micro bubbles and carbon fiber powder;
the garbage incinerator slag consists of first particle garbage incinerator slag and second particle garbage incinerator slag;
the fineness of the first granular garbage incinerator slag is 90-120 meshes;
the fineness of the second granular garbage incinerator slag is 60-80 meshes.
The invention relates to one of the technical schemes of aggregate, which has at least the following beneficial effects: the aggregate of the invention takes cement, deposited beads and silica fume as the basis, fully utilizes the active ingredients of solid waste of waste incineration slag (the slag ingredients are mainly calcium and siliceous, and are partly active, and can react with cement to generate hydration products), carries out density adjustment by filling closed-cell vitrified microbeads (the density of the closed-cell vitrified microbeads is lower, and different density adjustment is realized by taking different mixing amounts as filling frameworks in a system), and increases the toughness of carbon fiber powder, thereby preparing lightweight high-strength aggregate with excellent performance, and realizing the density of the aggregate at 600kg/m 3 ～1800kg/m 3 The pressure of the cylinder can reach 20MPa at the highest, and the rehydration of the aggregate and the formation of concrete slurry are well combined when the concrete is prepared, so that weak links of the aggregate and the slurry are avoided, and the concrete is used for preparing light high-strength concrete and has good performance and advantages.
The garbage incinerator slag with different fineness is matched for use, so that the compact stacking of different granularities is realized, and the stacking density of aggregate is improved.
According to some embodiments of the invention, the aggregate is prepared from a raw material comprising water and an admixture.
According to some embodiments of the invention, the aggregate comprises the following preparation raw materials in mass fraction: 25-40% of cement, 2-5% of precipitated beads, 8-12% of silica fume, 25-30% of garbage incinerator slag, 0.5-1.0% of exciting agent, 8-35% of closed-cell vitrified microbeads, 0.5-1.0% of carbon fiber powder, 1-2% of additive and 5-10% of water.
By adjusting the components, the adjustment of the intensity is realized.
According to some embodiments of the invention, the cement is one of Portland cement or Portland cement.
According to some embodiments of the invention, the cement-related requirements meet GB/T175 general Portland Cement.
According to some embodiments of the invention, the density of the sinking beads is equal to or more than 1500kg/m 3 。
The quality of the sinking beads is controlled, the content of the floating beads is high in the too light state, and the activity strength is reduced.
According to some embodiments of the invention, siO in the silica fume 2 The mass fraction of the catalyst is more than or equal to 85 percent.
According to some embodiments of the invention, the mass ratio of the first particulate waste incineration slag to the second particulate waste incineration slag is 1:1-2.
According to some embodiments of the invention, the mass ratio of the first particulate waste incineration slag to the second particulate waste incineration slag is 1:1.
According to some embodiments of the invention, the activator is prepared from a starting material comprising calcium hydroxide and sodium silicate.
According to some embodiments of the invention, the active activator is compounded from calcium hydroxide and water glass.
According to some embodiments of the invention, the water content of the water glass is less than or equal to 70% by mass.
According to some embodiments of the invention, the closed cell vitrified microbeads have a fineness of 90 mesh to 120 mesh.
According to the inventionIn some embodiments, the closed cell vitrified microbeads have a close packing density of greater than or equal to 400kg/m 3 。
According to some embodiments of the invention, the closed cell vitrified microbeads have an apparent density of 600kg/m or less 3 。
By controlling the parameters of the closed-cell vitrified microbeads, the density ratio of the close packing is more than or equal to 0.7, so that the closed-cell vitrified microbeads have proper void ratio (proper void ratio is to ensure the close packing of the microbeads, and the close packing density and apparent density are controlled in a coordinated way, and the smaller the closer the packing density and apparent density are, the smaller the void ratio is), low density and high strength.
According to some embodiments of the invention, the fineness of the carbon fiber powder is 600 mesh to 800 mesh.
According to some embodiments of the invention, the carbon fiber powder has a diameter of 6 μm to 8 μm.
According to some embodiments of the invention, the carbon fiber powder has a diameter of 7 μm.
The diameter of the carbon fiber powder refers to the diameter of the single carbon fiber of the carbon fiber powder.
According to some embodiments of the invention, the additive is a water reducing agent.
According to some embodiments of the invention, the water reduction rate of the admixture is > 35%.
According to some embodiments of the invention, the aggregate is a spherical particulate aggregate; the particle size of the spherical particle aggregate is 5 mm-10 mm.
The particle size of the spherical particle aggregate is excessively large, resulting in a decrease in the strength of the aggregate.
The second aspect of the present invention provides a method for preparing the above aggregate, comprising the steps of:
s1, mixing the cement, the sinking beads, the silica fume, the garbage incinerator slag, the excitant, the closed-cell vitrified micro bubbles and the carbon fiber powder to prepare mixed powder;
adding the additive and the water into the mixed powder to prepare mixed slurry;
s2, pelleting the mixed slurry prepared in the step S1, and curing to obtain the finished product.
According to some embodiments of the invention, the mixing time in step S1 is 2min to 3min.
According to some embodiments of the invention, the preparation time of the mixed slurry in step S1 is 8min to 10min.
According to some embodiments of the invention, the curing comprises the steps of: naturally curing for 24-26 h in air, steam curing for 12-14 h at 90-95 ℃, and curing for 6-8 h at 180-200 ℃ and vapor pressure of 1-1.5 MPa.
According to some embodiments of the invention, the natural curing temperature is 10 ℃ to 30 ℃.
According to some embodiments of the invention, the natural curing humidity is above 50%.
According to some embodiments of the invention, the method of preparing aggregate comprises the steps of:
s01, mixing and homogenizing the cement, the sinking beads, the silica fume, the garbage incinerator slag, the excitant, the closed-cell vitrified micro bubbles and the carbon fiber powder for 2-3 min to obtain mixed powder;
s02, adding the additive and the water into the mixed powder prepared in the step S01, and dispersing for 8-10 min to obtain slurry;
s03, pressing the slurry prepared in the step S02 into particles to obtain spherical particle aggregate with the particle size of 5-10 mm.
S04, naturally curing the spherical particle aggregate prepared in the step S03 in air for 24-26 h, then steam curing at 90-95 ℃ for 12-14 h, and finally curing at 180-200 ℃ under the conditions of vapor pressure of 1-1.5 MPa for 6-8 h.
According to some embodiments of the invention, the natural curing temperature is 10 ℃ to 30 ℃.
According to some embodiments of the invention, the natural curing humidity is above 50%.
In a third aspect, the invention provides the use of an aggregate as described above in the preparation of concrete.
According to at least one embodiment of the present invention, the following advantageous effects are provided:
the invention utilizes the waste incineration slag to prepare the light high-strength aggregate with excellent performance, widens the application range of high-strength light concrete, enriches the resource utilization mode of the waste incineration slag, and realizes the green low-carbon development of the concrete industry.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The cement used in each embodiment of the invention adopts the bimodal conch 52.5-grade ordinary Portland cement with the density of 3.21g/cm 3 Specific surface area 365m 2 The compression strength per kg,28d is 58.1MPa.
The sinking beads are produced by using Henan platinum-moist casting material, and the density is 1.50g/cm 3 28d Activity means110%.
The silica fume is semi-encrypted silica fume, siO, provided by Sichuan Langtan Co., ltd 2 98% by weight and 2.15g/cm by weight 3 Specific surface area 12000m 2 The activity index per kg,28d was 105%.
The garbage incinerator slag is taken from a garbage incineration power plant with long sand, and is ground into two types of specified 60-80 meshes and 90-120 meshes according to the mass ratio of 1:1 are uniformly mixed.
The active excitant is formed by compounding commercial calcium hydroxide and water glass (the mass ratio of the calcium hydroxide to the sodium silicate is controlled to be 1:1, and the mass fraction of the water glass is 40%).
The closed-cell vitrified microbeads are closed-cell vitrified microbeads (closed-cell perlite) produced by Xinyang Karster company, the fineness is 90-120 meshes, and the compact stacking density is 420kg/m 3 Apparent density 500kg/m 3 。
The carbon fiber powder is special cement-reinforced carbon fiber powder produced by Shenzhen carbon fiber technology company, the fineness of the carbon fiber powder is 600 meshes, and the diameter of carbon fibers in the carbon fiber powder is 7 mu m.
The high-performance additive adopts a polycarboxylic acid high-performance water reducer provided by new material building company, the water reducing rate is 35%, and the solid content is 40%.
The water is clean tap water.
Example 1
The embodiment is an aggregate, which is prepared from the following raw materials in percentage by mass:
25% of cement, 5% of precipitated beads, 10% of silica fume, 15% of garbage incinerator slag, 0.5% of active excitant, 35% of closed-cell vitrified microbeads, 0.5% of carbon fiber powder, 1% of high-performance additive and 8% of water, wherein the total mass of the high-performance additive meets 100%.
Example 2
The embodiment is an aggregate, which is prepared from the following raw materials in percentage by mass:
30% of cement, 2% of precipitated beads, 8% of silica fume, 25% of garbage incinerator slag, 0.5% of active excitant, 25% of closed-cell vitrified microbeads, 0.5% of carbon fiber powder, 1% of high-performance additive and 8% of water, wherein the total mass of the high-performance additive meets 100%.
Example 3
The embodiment is an aggregate, which is prepared from the following raw materials in percentage by mass:
34% of cement, 3% of precipitated beads, 10% of silica fume, 28% of garbage incinerator slag, 0.5% of active excitant, 15% of closed-cell vitrified microbeads, 0.5% of carbon fiber powder, 1% of high-performance additive and 8% of water, wherein the total mass of the high-performance additive meets 100%.
Example 4
The embodiment is an aggregate, which is prepared from the following raw materials in percentage by mass:
35% of cement, 4% of precipitated beads, 10% of silica fume, 30% of garbage incinerator slag, 1% of active excitant, 10% of closed-cell vitrified microbeads, 1% of carbon fiber powder, 1.5% of high-performance additive and 8% of water, wherein the total mass of the high-performance additive meets 100%.
Example 5
The embodiment is an aggregate, which is prepared from the following raw materials in percentage by mass:
40% of cement, 4% of precipitated beads, 12% of silica fume, 25% of garbage incinerator slag, 0.5% of active excitant, 8% of closed-cell vitrified microbeads, 1% of carbon fiber powder, 2% of high-performance additive and 7.5% of water, wherein the total mass of the high-performance additive meets 100%.
The preparation method of the aggregate in the embodiments 1 to 5 of the invention comprises the following steps:
s1, adding cement, deposited beads, silica fume, garbage incineration slag, an activity excitant, closed-cell vitrified micro bubbles and carbon fiber powder into a stirrer, mixing and homogenizing for 3min to obtain mixed powder;
s2, adding the high-performance additive and water into a stirrer, and uniformly stirring the mixture with the mixed powder for 10min to obtain slurry;
and S3, performing aggregate molding on the slurry prepared in the step S2 by adopting a spherical pill making machine to prepare spherical particle aggregates, and obtaining the spherical particle aggregates with the particle size of 5-10 mm.
S4, naturally curing the spherical granular aggregate prepared in the step S3 in the air for 24 hours, then curing the spherical granular aggregate for 12 hours by steam at 90 ℃, then curing the spherical granular aggregate for 6 hours under the autoclaved condition of 180 ℃ and 1.00MPa, and taking out the spherical granular aggregate after natural cooling.
The aggregate prepared in the embodiments 1 to 5 of the invention is detected in terms of appearance quality, apparent density and cylinder pressure intensity, and the testing method refers to GB/T17431-2010 lightweight aggregate and the testing method thereof; heavy metal leaching safety detection the leaching concentration of heavy metal Cd, pb, cr, as in the product was detected and analyzed according to the sulfuric acid-nitric acid leaching method specified in HJ/T299-2007, and the test results are shown in table 1.
TABLE 1 Performance test results of aggregates corresponding to examples 1 to 5 of the present invention
Note that: no representative ion concentration of less than 0.0001mg/L was detected in the present table.
The results of the tests in examples 1 to 5 of the present invention show that: aggregate in examples 1 to 5 of the present invention had a density grade of 1000kg/m 3 ～1800kg/m 3 The method has the advantages that the method is regulated in a range, the cylinder pressure can reach 23MPa, the performance is excellent, the concentration of heavy metal ions is far lower than the limit value of the national standard GB5083.3-2007, the method is green and harmless, part of garbage incinerator slag is consumed, and the method has wide application prospect and remarkable social benefit.
The aggregate with high cylinder pressure intensity is prepared by reasonably matching the dosage of the cementing material (cement, deposited beads, silica fume and garbage incineration slag) and the dosage of the closed-pore vitrified microbeads; the perlite is used as a light filling material, and the consumption is high and the strength is low.
In conclusion, the aggregate of the invention is based on aluminosilicate cementing materials such as cement, deposited beads and silica fume, and adopts an activity excitant and autoclaved curing conditions (the activity excitant fully excites the activity in slag fully, and the autoclaved curing excites inert SiO under normal temperature conditions) 2 ) The solid waste active ingredients of the municipal refuse incinerator slag are fully utilized, the density is adjusted by filling closed-cell vitrified microbeads, the strength and the toughness of the carbon fiber powder are increased, the light high-strength aggregate with excellent performance is obtained, and the density of the aggregate is 1000kg/m 3 ～1800kg/m 3 In-range adjustment, cartridgeThe highest compressive strength can reach 20MPa, and meanwhile, when the concrete is prepared, the aggregate rehydration and the concrete slurry form are well combined, so that weak links of the aggregate and the slurry are avoided, and the concrete is used for preparing light high-strength concrete and has good performance and advantages.
While the embodiments of the present invention have been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Claims (8)
1. The aggregate is characterized by comprising the following preparation raw materials: cement, deposited beads, silica fume, garbage incinerator slag, an exciting agent, closed-cell vitrified micro bubbles, carbon fiber powder, water and an additive; the additive is a polycarboxylic acid high-performance water reducer;
the garbage incinerator slag consists of first particle garbage incinerator slag and second particle garbage incinerator slag;
the fineness of the first granular garbage incinerator slag is 90-120 meshes;
the fineness of the second granular garbage incinerator slag is 60-80 meshes;
the aggregate comprises the following preparation raw materials in percentage by mass: 25-40% of cement, 2-5% of precipitated beads, 8-12% of silica fume, 25-30% of garbage incinerator slag, 0.5-1.0% of exciting agent, 8-35% of closed-cell vitrified microbeads, 0.5-1% of carbon fiber powder, 1-2% of additive and 5-10% of water. The sum of the dosages of the components is 100 percent;
the close packing density of the closed-cell vitrified microbeads is more than or equal to 400kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The apparent density of the closed-cell vitrified microbeads is less than or equal to 600kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The apparent density of the compact bulk density ratio is more than or equal to 0.7; the density of the sinking beads is more than or equal to 1500kg/m 3 ；
The mass ratio of the first particle garbage incinerator slag to the second particle garbage incinerator slag is 1:1-2;
the exciting agent is prepared by compounding calcium hydroxide and sodium silicate as raw materials.
2. An aggregate according to claim 1, wherein: siO in the silica fume 2 The mass fraction of the catalyst is more than or equal to 85 percent.
3. An aggregate according to claim 1, wherein: the fineness of the closed-cell vitrified microbeads is 90-120 meshes.
4. An aggregate according to claim 1, wherein: the fineness of the carbon fiber powder is 600-800 meshes.
5. An aggregate according to claim 1, wherein: the diameter of the carbon fiber powder is 6-8 mu m.
6. An aggregate according to claim 1, wherein: the aggregate is spherical particle aggregate; the particle size of the spherical particle aggregate is 5 mm-10 mm.
7. A method of preparing an aggregate as claimed in any one of claims 1 to 6, wherein: the method comprises the following steps:
s1, mixing the cement, the sinking beads, the silica fume, the garbage incineration slag, the exciting agent, the closed-cell vitrified micro bubbles and the carbon fiber powder, and homogenizing for 2-3 min to obtain mixed powder;
s2, adding the additive and the water into the mixed powder, and dispersing for 8-10 min to prepare mixed slurry;
s3, pressing the slurry prepared in the step S2 into particles to obtain spherical particle aggregate with the particle size of 5-10 mm;
s4, naturally curing the spherical granular aggregate prepared in the step S3 in air for 24-26 h, then steam curing at 90-95 ℃ for 12-14 h, and finally curing at 180-200 ℃ under the conditions of vapor pressure of 1-1.5 MPa for 6-8 h.
8. Use of an aggregate as defined in any one of claims 1 to 6 in the preparation of concrete.
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