CN115385603A - Concrete mineral blended aggregate and preparation process and application thereof - Google Patents
Concrete mineral blended aggregate and preparation process and application thereof Download PDFInfo
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- CN115385603A CN115385603A CN202211031603.9A CN202211031603A CN115385603A CN 115385603 A CN115385603 A CN 115385603A CN 202211031603 A CN202211031603 A CN 202211031603A CN 115385603 A CN115385603 A CN 115385603A
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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
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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 relates to the technical field of preparation of mineral admixture, and particularly discloses concrete mineral admixture aggregate and a preparation process and application thereof. The aggregate comprises zeolite particles, the pores of the zeolite particles contain a hydrophobic agent, the pores on the surface layers of the zeolite particles are filled with a component containing hydratable filler and nano-silica, and bonding between the filler and the zeolite is realized through partial hydration products in the filler. The method comprises the following steps: (1) And mixing the zeolite particles with a hydrophobic agent, and drying to obtain the modified zeolite particles. (2) Preparing hydratable filler, nano-silica and liquid alcohol into slurry, then filling the slurry into the surface pores of the modified zeolite particles, and performing steam curing on the zeolite particles after the completion to obtain the concrete mineral blended aggregate. The preparation process of the invention takes the zeolite particles as the lightweight aggregate, and further overcomes the defects existing when the zeolite is used as the lightweight aggregate after modification.
Description
Technical Field
The invention relates to the technical field of preparation of mineral admixture, in particular to concrete mineral admixture aggregate and a preparation process and application thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The lightweight concrete is a novel lightweight heat-insulating material containing a large number of closed air holes and formed by adding materials such as foaming agent and the like into cement and then naturally curing. The lightweight concrete has the technical advantages of small density, good heat insulation performance, good sound and fire resistance, good low-elasticity shock absorption performance and the like, and is widely applied to the manufacture of products such as lightweight wallboards, sandwich components of prefabricated reinforced concrete, roof heat insulation layers and the like. Research shows that the dead weight of the building can be reduced by more than 20 percent, and some can even reach 30 to 40 percent by adopting the lightweight concrete in building structures such as inner and outer walls, layers, floors, columns and the like of the building, so that the dead weight of the building can be obviously reduced, and obvious economic benefit is generated.
The basic components of the lightweight concrete comprise cement, fly ash, crushed shale ceramsite aggregate and the like, other additives can be added, and the concrete materials are adopted on the wall, the layer surface, the floor and the like of a building. However, the preparation process of the shale ceramsite aggregate is not only complicated, but also the procedures of preheating, high-temperature roasting and the like contained in the preparation process cause that the energy consumption for producing the lightweight aggregate is high. And a large amount of microcracks are easily caused in the obtained aggregate in the process of crushing the shale ceramisite, so that the mechanical property of the aggregate is influenced. Therefore, it is necessary to search for a new lightweight concrete aggregate.
Disclosure of Invention
The invention provides a concrete mineral blended aggregate and a preparation process and application thereof. In order to achieve the purpose, the invention discloses the following technical scheme.
In a first aspect, the present invention provides a concrete mineral admixture aggregate comprising zeolite particles, the pores of the zeolite particles containing a hydrophobic agent therein, and the pores of the surface layers of the zeolite particles being filled with a composition comprising a hydratable filler, nanosilica, and the filler and zeolite being bound together by a portion of the hydration products in the filler.
In a further aspect, the hydrophobic agent comprises: decafluorooctyltriethoxysilane, heptadecafluorodecyltriethoxysilane, n-octyltriethoxysilane, isobutyltriethoxysilane, etc.
In a further aspect, the hydratable filler comprises: tricalcium silicate, tricalcium aluminate, and tetracalcium aluminoferrite. The method not only can seal the surface pores of the zeolite particles, but also can participate in the hydration process of the lightweight concrete in the subsequent process, so that the mineral blended aggregate prepared by the method is strongly combined with the concrete matrix.
In a second aspect, the present invention provides a process for preparing a concrete mineral aggregate blend, comprising:
(1) The zeolite particles are mixed with a hydrophobizing agent to be absorbed into the zeolite particles, and then the zeolite particles are dried to obtain modified zeolite particles for later use.
(2) Preparing hydratable filler, nano-silica and liquid alcohol into slurry, then filling the slurry into the surface pores of the modified zeolite particles, and performing steam curing on the zeolite particles after the completion to obtain the concrete mineral blended aggregate.
In a further technical scheme, in the step (1), the particle size of the zeolite particles is 3-5 mm.
In a further technical scheme, in the step (1), the hydrophobic agent is a diluent formed by the hydrophobic agent and isopropanol. Optionally, the mass fraction of hydrophobing agent in the diluent is 2.5 to 4%.
In a further technical scheme, the ratio of the zeolite particles to the diluent is 1g:200 to 350ml.
In a further technical solution, in the step (1), the drying manner includes: air-drying, heat-drying, or the like. Optionally, the time for drying by blowing is 60-80 min. Or the heating and drying temperature is 45-60 ℃, and the drying time is 30-45 min. The solvent in the hydrophobizing agent dilution in the zeolite particles is removed by drying.
In a further technical scheme, in the step (2), the liquid alcohol includes any one of methanol, ethanol and the like. Preferably, the mass concentration of the liquid alcohol is not less than 95%. Hydration of the hydratable filler in the slurry can be avoided by using liquid alcohol as a solvent.
In a further technical scheme, in the step (2), the weight part ratio of the filler to the nano-silica is 1.0 part: 0.2 to 0.35 portion. The nano silicon dioxide can perform secondary hydration reaction with calcium hydroxide generated by hydration in a later period, and a harmful hydration product calcium hydroxide is consumed.
In a further technical scheme, in the step (2), the solid content of the slurry is 40-55% (mass fraction).
In a further technical scheme, in the step (2), the slurry and the modified zeolite particles are placed in a drum mixer together for rolling and mixing, so that the slurry is filled in pores on the surface layers of the modified zeolite particles, and the modified zeolite particles are obtained. Preferably, the weight part ratio of the slurry to the modified zeolite particles is 1.5-2.3: 0.8 to 1.0 portion; the mixing time is 20-40 min, and the proportion of the slurry and the modified zeolite particles and the mixing time can be adjusted according to actual needs.
In a further technical scheme, in the step (2), the steam curing temperature is 50-65 ℃, the time is 2-3 hours, and the relative humidity is 90-95%. Through the steam curing process, the liquid alcohol in the slurry can be removed, and part of the hydratable filler is subjected to hydration reaction, so that the filler is tightly combined with the zeolite, and the problem that the filler falls off from the zeolite due to volatilization of the liquid alcohol is solved.
In a third aspect, the invention discloses application of the concrete mineral blended aggregate in the field of constructional engineering, preferably as an aggregate of lightweight concrete, which not only has the characteristic of light weight, but also can participate in the hydration process of the lightweight concrete, and a hydrophobic network system is constructed to improve the waterproof and anti-permeability performance of the lightweight concrete.
Compared with the prior art, the invention has the following beneficial effects:
the porous characteristic of the zeolite is found to provide good conditions for the zeolite to be used as an aggregate of lightweight concrete. However, the present invention has further found that the direct use of zeolite as an aggregate for lightweight concrete has problems of low strength, poor water-and water-barrier properties, and the like. After research, the main reason is that the zeolite can absorb a large amount of water after being added into concrete due to the porous characteristic, so that cement in the concrete is not fully hydrated, and the strength of the concrete is influenced. Meanwhile, the porous property of zeolite also affects the waterproof and anti-permeability performance of concrete.
In order to overcome the above problems, first, the present invention mixes zeolite with a hydrophobizing agent using its porous characteristic, thereby allowing a large amount of the hydrophobizing agent to be adsorbed in the voids of the zeolite. In addition, the invention also adopts the hydratable filler, the nano-silica and the liquid alcohol to prepare the slurry to fill the pores on the surface layer of the zeolite, and the modified zeolite well overcomes the problems of low strength, poor waterproof and anti-permeability performance and the like of the natural zeolite when being used as the aggregate of the lightweight concrete. The reason for this is that: (1) The hydrophobic agent in the zeolite can effectively prevent the water in the concrete from being adsorbed by the zeolite and locked in the pores of the zeolite, so that the cement in the concrete is hydrated with sufficient water to complete the hydration process, more hydration products are generated, and the strength of the concrete is ensured. (2) As the hydration filler and the nano-silica are consumed in the cement hydration process, part of the hydrophobic agent in the zeolite is released into the concrete to jointly construct a hydrophobic network system with hydration products and the like, so that the overall waterproof and anti-permeability performance of the concrete is improved. Meanwhile, the release of the water repellent agent lags behind the hydration process, so that the problem that the release of the water repellent agent prematurely hinders the contact of cement particles and water molecules to influence the hydration is avoided. (3) By filling the hydrated filler and the nano-silica in the surface layer pores of the zeolite, on one hand, the zeolite can still keep the characteristics of porosity and light weight by filling only the surface layer pores. On the other hand, the zeolite aggregate can participate in the hydration process of cement after entering the lightweight concrete, more hydration products are generated, the strength of the zeolite aggregate is improved, and the overall strength of the concrete is further improved. Meanwhile, the hydration product can ensure that the combination of the zeolite aggregate and the concrete matrix is tighter and firmer, and the integral strength of the concrete is improved. In addition, the nano-silica can be secondarily hydrated with calcium hydroxide which is one of hydration products, so that the harmful hydration product is consumed, and the nano-silica is converted into calcium silicate hydrate gel which is a beneficial product, thereby being beneficial to improving the strength of the concrete. (4) The invention also adopts a process of steam curing the filled modified zeolite particles, not only can remove the liquid alcohol in the slurry through short-time steam curing, but also can hydrate part of the hydratable filler to tightly combine the filler and the zeolite, thereby overcoming the problems of pulverization of the filler and falling off from the zeolite caused by volatilization of the liquid alcohol. At the same time, hydration of the hydratable filler in the slurry can be avoided by configuring the slurry with liquid alcohol.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a graph showing the effects of zeolite particles used in the following examples.
FIG. 2 is a graph showing the effect of lightweight concrete prepared in the following examples.
Detailed Description
The present invention is further described in the following examples, which are intended to be illustrative only and not to be limiting as to the scope of the invention, wherein the preferred methods and materials are set forth in the following description. It is to be understood that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art, unless otherwise defined.
In addition, the reagents or raw materials used in the present invention can be purchased from conventional sources, and unless otherwise specified, the reagents or raw materials used in the present invention can be used in a conventional manner in the art or in accordance with the product specification.
Example 1
A preparation process of concrete mineral blended aggregate comprises the following steps:
(1) Screening natural zeolite particles with the particle size of 3-5 mm (refer to figure 1), washing with water, and drying for later use.
(2) The heptadecafluorodecyltriethoxysilane was mixed with isopropanol to form a 3.5% by mass dilution of heptadecafluorodecyltriethoxysilane for use.
(3) Mixing the zeolite particles with a diluent according to a ratio of 1g: mixing at a ratio of 300ml, standing for 10min, and taking out zeolite particles. And then continuously blowing and drying the zeolite particles for 60min to obtain modified zeolite particles for later use.
(4) Mixing tricalcium silicate powder, nano silicon dioxide and ethanol (the mass concentration is 95%), and performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 47.6%, wherein the weight parts of the tricalcium silicate powder and the nano silicon dioxide are 1.0: 0.3 part by weight. Mixing the slurry with modified zeolite particles according to the following weight ratio of 2 parts: 0.9 part by weight of the mixture was placed in a tumbler mixer and tumbled and mixed for 30 minutes. And (3) performing steam curing on the obtained zeolite particles (at the temperature of 60 ℃, for 3 hours and at the relative humidity of 95%) to obtain the concrete mineral blended aggregate.
Example 2
A preparation process of concrete mineral blended aggregate comprises the following steps:
(1) Screening natural zeolite particles with the particle size of 3-5 mm (refer to figure 1), washing with water, and drying for later use.
(2) Mixing heptadecafluorodecyltriethoxysilane with isopropanol to form a 2.5 mass percent heptadecafluorodecyltriethoxysilane diluent for later use.
(3) Mixing the zeolite particles with a diluent according to a ratio of 1g: mixing at a ratio of 350ml, standing for 10min, and taking out zeolite particles. And then continuously blowing and drying the zeolite particles for 80min to obtain modified zeolite particles for later use.
(4) Mixing tricalcium aluminate powder, nano silicon dioxide and absolute ethyl alcohol, and then carrying out ultrasonic dispersion for 20min to obtain slurry with the solid content of 40%, wherein the weight parts of the tricalcium aluminate powder and the nano silicon dioxide are 1.0: 0.2 part by weight. Mixing the slurry with modified zeolite particles according to the following weight ratio of 1.5: 0.8 part by weight of the mixture was placed in a tumbler mixer and tumbled and mixed for 20 minutes. And (3) performing steam curing on the obtained zeolite particles (the temperature is 65 ℃, the time is 2 hours, and the relative humidity is 95%) to obtain the concrete mineral blended aggregate.
Example 3
A preparation process of concrete mineral blended aggregate comprises the following steps:
(1) Screening natural zeolite particles with the particle size of 3-5 mm (refer to figure 1), washing with water, and drying for later use.
(2) Tridecafluorodecyltriethoxysilane was mixed with isopropanol to form a 4.0% by mass dilution of heptadecafluorodecyltriethoxysilane for future use.
(3) Mixing the zeolite particles with a diluent according to a ratio of 1g: mixing at a ratio of 200ml, standing for 10min, and taking out zeolite particles. And drying the zeolite particles at 45 ℃ for 45min to obtain modified zeolite particles for later use.
(4) Mixing tetracalcium aluminoferrite powder, nano-silica and methanol (with the mass concentration of 95%), and performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 55%, wherein the weight parts of the tetracalcium aluminoferrite powder and the nano-silica are 1.0: 0.35 parts by weight. Mixing the slurry and modified zeolite particles according to the following weight ratio of 2.3: 1.0 part by weight of the mixture was placed in a tumbler mixer and tumbled and mixed for 40min. And (3) performing steam curing on the obtained zeolite particles (the temperature is 50 ℃, the time is 3 hours, and the relative humidity is 90%) to obtain the concrete mineral blended aggregate.
Example 4
A preparation process of concrete mineral blended aggregate comprises the following steps:
(1) Screening natural zeolite particles with the particle size of 3-5 mm (refer to figure 1), washing with water, and drying for later use.
(2) The heptadecafluorodecyltriethoxysilane was mixed with isopropanol to form a 3.0% by mass dilution of heptadecafluorodecyltriethoxysilane for use.
(3) Mixing the zeolite particles with a diluent in a ratio of 1g:270ml, standing for 15min, and taking out zeolite particles. And drying the zeolite particles at 60 ℃ for 30min to obtain modified zeolite particles for later use.
(4) Mixing tricalcium silicate powder, nano silicon dioxide and ethanol (the mass concentration is 95%), and performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 51.2%, wherein the weight parts of the tricalcium silicate powder and the nano silicon dioxide are 1.0: 0.26 part by weight. Mixing the slurry with modified zeolite particles according to the following weight ratio of 1.8: 0.8 part by weight of the mixture was placed in a tumbler mixer and tumbled and mixed for 25min. And (3) performing steam curing on the obtained zeolite particles (the temperature is 55 ℃, the time is 3 hours, and the relative humidity is 95%) to obtain the concrete mineral blended aggregate.
Example 5
A preparation process of concrete mineral blended aggregate comprises the following steps:
(1) Screening natural zeolite particles with the particle size of 3-5 mm (refer to figure 1), washing with water, and drying for later use.
(2) The zeolite particles were mixed with isopropanol in a ratio of 1g: mixing at a ratio of 300ml, standing for 10min, and taking out zeolite particles. And then continuously blowing and drying the zeolite particles for 60min to obtain modified zeolite particles for later use.
(3) Mixing tricalcium silicate powder, nano silicon dioxide and ethanol (the mass concentration is 95%), performing ultrasonic dispersion for 20min, and obtaining slurry with the solid content of 47.6%, wherein the weight parts of the tricalcium silicate powder and the nano silicon dioxide are as follows: 0.3 part by weight. Mixing the slurry with modified zeolite particles according to the following weight ratio of 2 parts: 0.9 part by weight of the mixture was placed in a tumbler mixer and tumbled and mixed for 30 minutes. And (3) performing steam curing on the obtained zeolite particles (at the temperature of 60 ℃, for 3 hours and at the relative humidity of 95%) to obtain the concrete mineral blended aggregate.
Example 6
A preparation process of concrete mineral blended aggregate comprises the following steps:
(1) Screening natural zeolite particles with the particle size of 3-5 mm (refer to figure 1), washing with water, and drying for later use.
(2) Mixing heptadecafluorodecyltriethoxysilane with isopropanol to form a diluent of heptadecafluorodecyltriethoxysilane with the mass percent of 3.5 percent for later use.
(3) Mixing the zeolite particles with a diluent in a ratio of 1g: mixing at a ratio of 300ml, standing for 10min, and taking out zeolite particles. And then continuously blowing and drying the zeolite particles for 60min to obtain modified zeolite particles for later use.
(4) Mixing tricalcium silicate powder, nano silicon dioxide and ethanol (the mass concentration is 95%), and performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 47.6%, wherein the weight parts of the tricalcium silicate powder and the nano silicon dioxide are 1.0: 0.3 part by weight. Mixing the slurry with modified zeolite particles according to the following weight ratio of 2 parts: 0.9 part by weight of the mixture was placed in a tumbler mixer and tumbled and mixed for 30 minutes. And heating the obtained zeolite particles for 3 hours at the temperature of 60 ℃ under natural humidity to obtain the concrete mineral blended aggregate.
Example 7
A preparation process of concrete mineral blended aggregate comprises the following steps:
(1) Screening natural zeolite particles with the particle size of 3-5 mm (refer to figure 1), washing with water, and drying for later use.
(2) The zeolite particles were mixed with isopropanol in a ratio of 1g: mixing at a ratio of 350ml, standing for 10min, and taking out zeolite particles. And then continuously blowing and drying the zeolite particles for 80min to obtain modified zeolite particles for later use.
(3) Mixing tricalcium aluminate powder, nano silicon dioxide, heptadecafluorodecyltriethoxysilane and isopropanol, and then carrying out ultrasonic dispersion for 20min to obtain slurry with the solid content of 40%, wherein the weight parts of the tricalcium aluminate powder and the nano silicon dioxide are 1.0: 0.2 part by weight, and the slurry contains 2.5% by mass of heptadecafluorodecyltriethoxysilane. Mixing the slurry with modified zeolite particles according to the following weight ratio of 1.5: 0.8 part by weight of the mixture was placed in a tumbler mixer and tumbled for 20 minutes. And (3) performing steam curing on the obtained zeolite particles (the temperature is 65 ℃, the time is 2 hours, and the relative humidity is 95%) to obtain the concrete mineral blended aggregate.
Example 8
A preparation process of concrete mineral blended aggregate comprises the following steps:
(1) Screening natural zeolite particles with the particle size of 3-5 mm (refer to figure 1), washing with water, and drying for later use.
(2) Tridecafluordecyltriethoxysilane is mixed with isopropanol to form a 4.0% by mass dilution of heptadecafluorodecyltriethoxysilane for use.
(3) Mixing the zeolite particles with a diluent in a ratio of 1g: mixing at a ratio of 200ml, standing for 10min, and taking out zeolite particles. And drying the zeolite particles at 45 ℃ for 45min to obtain modified zeolite particles for later use.
(4) Mixing nano silicon dioxide and methanol (mass concentration is 95 percent), and performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 55 percent. Mixing the slurry with modified zeolite particles according to the following weight ratio of 2.3: 1.0 part by weight of the mixture was placed in a tumbler mixer and tumbled and mixed for 40 minutes. And (3) performing steam curing on the obtained zeolite particles (the temperature is 50 ℃, the time is 3 hours, and the relative humidity is 90%) to obtain the concrete mineral blended aggregate.
Example 9
A preparation process of concrete mineral blended aggregate comprises the following steps:
(1) Screening natural zeolite particles with the particle size of 3-5 mm (refer to figure 1), washing with water, and drying for later use.
(2) Mixing heptadecafluorodecyltriethoxysilane with isopropanol to form a diluent of heptadecafluorodecyltriethoxysilane with the mass percent of 3.0% for later use.
(3) Mixing the zeolite particles with a diluent in a ratio of 1g:270ml, standing for 15min, and taking out zeolite particles. And drying the zeolite particles at 60 ℃ for 30min to obtain modified zeolite particles for later use.
(4) Mixing tricalcium silicate powder with ethanol (the mass concentration is 95 percent), and performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 51.2 percent. Mixing the slurry with modified zeolite particles according to the following weight ratio of 1.8: 0.8 part by weight of the mixture was placed in a tumbler mixer and tumbled and mixed for 25min. And (3) performing steam curing on the obtained zeolite particles (at the temperature of 55 ℃, for 3 hours and at the relative humidity of 95%) to obtain the concrete mineral blended aggregate.
Example 10
A preparation process of concrete mineral blended aggregate comprises the following steps:
(1) Screening natural zeolite particles with the particle size of 3-5 mm (refer to figure 1), washing with water, and drying for later use.
(2) The heptadecafluorodecyltriethoxysilane was mixed with isopropanol to form a 3.0% by mass dilution of heptadecafluorodecyltriethoxysilane for use.
(3) Mixing the zeolite particles with a diluent in a ratio of 1g:270ml, standing for 15min, and taking out zeolite particles. And then drying the zeolite particles at 60 ℃ for 30min to obtain the concrete mineral blended aggregate.
Performance testing
Lightweight concrete was produced by using the concrete mineral aggregate prepared in examples 1 to 10 as an aggregate (see FIG. 2). Then, preparing the lightweight concrete into concrete samples according to the concrete physical mechanical property test method standard (GB/T50081-2019), and testing the 28d compressive strength of each concrete sample according to the standard. The concrete test pieces prepared from the concrete mineral aggregate blend of each example were also tested for their contact angle with water to test their water and permeation resistance, and the results are shown in the following table. It can be seen that the lightweight concrete samples prepared by using the concrete mineral blended aggregate prepared in examples 1 to 4 as the aggregate have good mechanical properties and waterproof and anti-permeability properties, i.e. the comprehensive properties are obviously superior to those of other examples, because the zeolite is modified by using a special process in examples 1 to 4, the defects existing when natural zeolite is used as the lightweight aggregate are effectively overcome.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A concrete mineral admixture aggregate, wherein the aggregate comprises zeolite particles, pores of the zeolite particles contain a hydrophobic agent, pores of a surface layer of the zeolite particles are filled with a component containing a hydratable filler and nano silica, and bonding between the filler and zeolite is achieved by partial hydration products in the filler.
2. The concrete mineral blended aggregate according to claim 1, wherein the water repellent agent comprises any one of tridecafluorooctyltriethoxysilane, heptadecafluorodecyltriethoxysilane, n-octyltriethoxysilane, and isobutyltriethoxysilane.
3. The concrete mineral blend aggregate of claim 1 or 2, wherein the hydratable filler comprises any one of tricalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite.
4. A preparation process of concrete mineral blended aggregate is characterized by comprising the following steps:
(1) Mixing the zeolite particles with a hydrophobic agent to enable the zeolite particles to be absorbed into the zeolite particles, and then drying to obtain modified zeolite particles for later use;
(2) Preparing hydratable filler, nano-silica and liquid alcohol into slurry, then filling the slurry into the surface pores of the modified zeolite particles, and performing steam curing on the zeolite particles after the completion to obtain the concrete mineral blended aggregate.
5. The process for preparing a concrete mineral blended aggregate according to claim 4, wherein in the step (1), the hydrophobizing agent is a diluted solution of a hydrophobizing agent and isopropyl alcohol;
preferably, the mass fraction of the hydrophobing agent in the diluent is 2.5-4%;
preferably, the ratio of zeolite particles to diluent is 1g:200 to 350ml
Preferably, in step (1), the zeolite particles have a particle size of 3 to 5mm.
6. The process for preparing a concrete mineral blended aggregate according to claim 4, wherein in the step (1), the drying means includes any one of air-blowing drying and heat-drying;
preferably, the time of the air blowing drying is 60-80 min;
preferably, the temperature for heating and drying is 45-60 ℃, and the drying time is 30-45 min.
7. The process for preparing the concrete mineral blended aggregate according to claim 4, wherein in the step (2), the weight part ratio of the filler to the nano silica is 1.0 part: 0.2 to 0.35 portion; preferably, in the step (2), the solid content of the slurry is 40-55% by mass fraction;
preferably, in the step (2), the liquid alcohol includes any one of methanol and ethanol;
preferably, the mass concentration of the liquid alcohol is not less than 95%.
8. The process for preparing a concrete mineral blended aggregate according to claim 4, wherein in the step (2), the slurry and the modified zeolite particles are placed together in a drum mixer to be tumbled and mixed, and the slurry is filled in pores on the surface layer of the modified zeolite particles;
preferably, the mixing time is 20-40 min;
preferably, the ratio of the slurry to the modified zeolite particles is 1.5 to 2.3 parts by weight: 0.8 to 1.0 weight portion.
9. The process for producing a concrete mineral aggregate according to any one of claims 4 to 8, wherein in the step (2), the steam curing is carried out at a temperature of 50 to 65 ℃ for 2 to 3 hours and at a relative humidity of 90 to 95%.
10. Use of the concrete mineral admixture aggregate according to any one of claims 1 to 3 or the concrete mineral admixture aggregate prepared by the production process according to any one of claims 4 to 9 in the field of construction engineering, preferably as an aggregate for lightweight concrete.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112194396A (en) * | 2020-09-21 | 2021-01-08 | 东南大学 | Slow-release hydrophobing agent for cement-based material, hydrophobic cement and preparation method thereof |
| CN112551943A (en) * | 2020-12-16 | 2021-03-26 | 华南理工大学 | Organic silicon slow-release type powder water repellent and preparation method thereof |
| CN112919849A (en) * | 2020-12-16 | 2021-06-08 | 中冶建筑研究总院有限公司 | Organic-inorganic composite hydrophobic functional material and preparation method thereof |
| KR102345422B1 (en) * | 2021-03-16 | 2021-12-29 | 한양대학교 에리카산학협력단 | Admixture of water-repellent impregnated natural zeolite and method for preparing the same |
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2022
- 2022-08-26 CN CN202211031603.9A patent/CN115385603B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112194396A (en) * | 2020-09-21 | 2021-01-08 | 东南大学 | Slow-release hydrophobing agent for cement-based material, hydrophobic cement and preparation method thereof |
| CN112551943A (en) * | 2020-12-16 | 2021-03-26 | 华南理工大学 | Organic silicon slow-release type powder water repellent and preparation method thereof |
| CN112919849A (en) * | 2020-12-16 | 2021-06-08 | 中冶建筑研究总院有限公司 | Organic-inorganic composite hydrophobic functional material and preparation method thereof |
| KR102345422B1 (en) * | 2021-03-16 | 2021-12-29 | 한양대학교 에리카산학협력단 | Admixture of water-repellent impregnated natural zeolite and method for preparing the same |
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