CN115385603B - 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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- CN115385603B CN115385603B CN202211031603.9A CN202211031603A CN115385603B CN 115385603 B CN115385603 B CN 115385603B CN 202211031603 A CN202211031603 A CN 202211031603A CN 115385603 B CN115385603 B CN 115385603B
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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, wherein the pores of the zeolite particles contain a hydrophobic agent, the pores of the surface layer of the zeolite particles are filled with a component containing hydratable filler and nano silicon dioxide, and the filler and the zeolite are bonded through partial hydration products in the filler. The method comprises the following steps: (1) Mixing zeolite particles with a hydrophobic agent, and then drying to obtain modified zeolite particles. (2) Preparing hydratable filler, nano silicon dioxide and liquid alcohol into slurry, filling the slurry into surface layer pores of the modified zeolite particles, and performing steam curing on the zeolite particles after completion to obtain the concrete mineral admixture aggregate. The preparation process of the invention uses zeolite particles as light aggregate, and further overcomes the defects existing when zeolite is used as the light 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 disclosure of this background section is only intended to increase the 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 already known to those of ordinary skill in the art.
The lightweight concrete is a novel lightweight thermal insulation material which is formed by adding materials such as foaming agent and the like into cement and then naturally curing the materials and contains a large number of closed pores. The lightweight concrete has the technical advantages of small density, good heat preservation and insulation performance, good sound insulation and fire resistance performance, good low-elasticity shock absorption performance and the like, and is widely applied to manufacturing products such as lightweight wallboards, sandwich components of precast reinforced concrete, roof heat preservation layers and the like. The study shows that the light concrete is adopted in the building structures such as the inner wall body, the outer wall body, the layer surface, the floor, the upright posts and the like of the building, so that the self weight of the building can be reduced by more than 20 percent, and some of the self weight can be even 30 to 40 percent, the self weight of the building can be obviously reduced, and obvious economic benefit is generated.
The basic composition of the lightweight concrete comprises cement, fly ash, crushed shale ceramsite aggregate and the like, and other additives can be added, so that the concrete materials are mostly adopted at the wall, the layer, the floor and the like of the building. However, the preparation process of the shale ceramsite aggregate is not only tedious, but also comprises the procedures of preheating, high-temperature roasting and the like, so that the production energy consumption of the lightweight aggregate is high. And a large number of microcracks are easily caused in the obtained aggregate in the process of crushing the shale ceramsite, so that the mechanical properties of the aggregate are affected. Therefore, it is necessary to explore the development of new lightweight concrete aggregates.
Disclosure of Invention
The invention provides a concrete mineral admixture aggregate, a preparation process and application thereof, wherein zeolite particles are used as light aggregate in the preparation process, and the defect that natural zeolite is directly used as the light aggregate is further overcome after modification. In order to achieve the above purpose, the present invention discloses the following technical solutions.
In a first aspect, the invention provides a concrete mineral admixture aggregate comprising zeolite particles, wherein the pores of the zeolite particles contain a hydrophobic agent, the pores of the surface layer of the zeolite particles are filled with a component containing a hydratable filler and nano-silica, and the filler and the zeolite are bonded through partial hydration products in the filler.
In a further technical solution, the hydrophobizing agent includes: any one of tridecafluorooctyltriethoxysilane, heptadecafluorodecyltriethoxysilane, n-octyltriethoxysilane, isobutyltriethoxysilane, and the like.
In a further aspect, the hydratable fill comprises: any one of tricalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. The method can not only realize the sealing of the surface pores of the zeolite particles, but also participate in the hydration process of the light concrete in the subsequent process, so that the mineral admixture aggregate prepared by the method is strongly combined with the concrete matrix.
In a second aspect, the invention provides a process for preparing a concrete mineral admixture aggregate comprising:
(1) Mixing zeolite particles with a hydrophobic agent to suck the zeolite particles into the zeolite particles, and then drying the zeolite particles to obtain modified zeolite particles for later use.
(2) Preparing hydratable filler, nano silicon dioxide and liquid alcohol into slurry, filling the slurry into surface layer pores of the modified zeolite particles, and performing steam curing on the zeolite particles after completion to obtain the concrete mineral admixture aggregate.
In a further embodiment, in the step (1), the zeolite particles have a particle size of 3 to 5mm.
In a further technical scheme, in the step (1), the hydrophobizing agent is a diluent formed by the hydrophobizing agent and isopropanol. Optionally, the mass fraction of the hydrophobe in the diluent is 2.5-4%.
In a further embodiment, the zeolite particles are present in a ratio to the diluent of 1g: 200-350 ml.
In a further aspect, in step (1), the drying method includes: any one of blow drying, heat drying, and the like. Optionally, the time of the air drying is 60-80 min. Or the temperature of the heating and drying is 45-60 ℃ and the drying time is 30-45 min. The solvent in the diluent of the hydrophobe is removed from the zeolite particles by drying.
In a further technical scheme, in the step (2), the liquid alcohol comprises 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 filling in the slurry is avoided by using a liquid alcohol as solvent.
In a further technical scheme, in the step (2), the weight part ratio of the filler to the nano silicon dioxide is 1.0 part: 0.2 to 0.35 part. The nano silicon dioxide can carry out secondary hydration reaction with calcium hydroxide generated by hydration in the later period, and the 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 tumbling and mixing, so that the slurry is filled in the pores on the surface layer 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 to 2.3 parts: 0.8 to 1.0 part; 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 temperature of the steam curing is 50-65 ℃, the time is 2-3 hours, and the relative humidity is 90-95%. Through the steam curing process, not only can the liquid alcohol in the slurry be removed, but also part of the hydratable filler is subjected to hydration reaction, so that the filler is tightly combined with 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 admixture aggregate in the field of constructional engineering, preferably as an aggregate of light concrete, which not only has the characteristic of light weight, but also can participate in the hydration process of the light concrete, construct a hydrophobic network system and improve the waterproof and impervious performances of the light concrete.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention discovers that the porous characteristic of zeolite provides good conditions for the zeolite to be used as the aggregate of light concrete. However, the invention further discovers that the zeolite is directly used as the aggregate of the light concrete, and has the problems of low strength, poor waterproof and impervious performances and the like. After research, the main reason is that the porous characteristic of zeolite can absorb a large amount of water after the zeolite is added into concrete, so that the cement in the concrete is insufficiently hydrated, and the strength of the concrete is affected. Meanwhile, the porous characteristic of zeolite also influences the water-proof and impervious properties of concrete.
In order to overcome the above problems, first, the present invention mixes zeolite with a hydrophobic agent using its porous property, thereby adsorbing a large amount of hydrophobic agent in the interstices of the zeolite. Secondly, the invention also adopts the hydratable filler, nano silicon dioxide and liquid alcohol to prepare slurry to fill the pores of the zeolite surface layer, and the modified zeolite well solves the problems of low strength, poor waterproof and impervious performances and the like of the natural zeolite when the natural zeolite is used as the aggregate of light concrete. The reason for this is that: (1) The hydrophobizing agent in the zeolite can effectively prevent moisture 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 moisture to complete the hydration process, more hydration products are generated, and the strength of the concrete is ensured. (2) And as the hydration filler and the nano silicon dioxide are consumed in the cement hydration process, part of the hydrophobing agent in the zeolite is released into the concrete to construct a hydrophobic network system together with hydration products and the like, so that the overall waterproof and impervious performance of the concrete is improved. Meanwhile, the release of the hydrophobizing agent is delayed in the hydration process, so that the problem that the contact of cement particles and water molecules is blocked too early by the release of the hydrophobizing agent to influence hydration is solved. (3) By filling the hydration filler and nano silica in the surface layer pores of the zeolite, on the one hand, the zeolite can still maintain the characteristics of porous and light weight by only filling the surface layer pores. On the other hand, the zeolite aggregate can participate in the hydration process of cement after entering the lightweight concrete, so that more hydration products are generated to improve the strength of the zeolite aggregate, and further improve the overall strength of the concrete. Meanwhile, the hydration product can enable the zeolite aggregate to be combined with the concrete matrix more tightly and firmly, and the overall strength of the concrete is improved. In addition, the nano-silica can be secondarily hydrated with calcium hydroxide, which is one of hydration products, not only consumes the harmful hydration products, but also converts the harmful hydration products into a beneficial product, namely hydrated calcium silicate gel, thereby contributing to the improvement of the strength of the concrete. (4) The invention also adopts the 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, so that the filler is tightly combined with the zeolite, and the problem that the filler is pulverized and falls off from the zeolite due to volatilization of the liquid alcohol is solved. At the same time, hydration of the hydratable filling in the slurry is avoided by formulating the slurry with a liquid alcohol.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Figure 1 is a graph of the effect of zeolite particles used in the following examples.
Fig. 2 is an effect diagram of the lightweight concrete prepared in the following examples.
Detailed Description
The invention is further illustrated below in connection with specific examples which are provided to illustrate the invention and are not to be construed as limiting the scope of the invention, which is defined by the preferred embodiments and materials described herein for illustrative purposes only. It is to be noted that all terms of art and science used herein have the same meanings as those familiar to those skilled in the art unless otherwise defined.
In addition, the reagents or raw materials used in the present invention can be obtained by purchasing them in a conventional manner, and unless otherwise specified, they are used in a conventional manner in the art or according to the product specifications.
Example 1
A preparation process of concrete mineral admixture aggregate comprises the following steps:
(1) Natural zeolite particles with the particle size of 3-5 mm (refer to figure 1) are screened, washed by water and dried for later use.
(2) The heptadecafluorodecyl triethoxysilane is mixed with isopropanol to form a diluent of the heptadecafluorodecyl triethoxysilane with the mass percentage of 3.5 percent for standby.
(3) Mixing the zeolite particles with a diluent in an amount of 1g: mixing at a ratio of 300ml, standing for 10min, and taking out zeolite particles. And then continuously drying the zeolite particles for 60min by blowing to obtain modified zeolite particles for standby.
(4) Mixing tricalcium silicate powder and nano silicon dioxide with ethanol (the mass concentration is 95%) and then performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 47.6%, wherein the tricalcium silicate powder and the nano silicon dioxide are 1.0 weight part: 0.3 parts by weight. Mixing the slurry with modified zeolite particles according to 2 parts by weight: the mixture of 0.9 parts by weight was placed in a drum mixer and tumble mixed for 30 minutes. And (3) performing steam curing (at 60 ℃ for 3 hours and with relative humidity of 95%) on the obtained zeolite particles after completion to obtain the concrete mineral admixture aggregate.
Example 2
A preparation process of concrete mineral admixture aggregate comprises the following steps:
(1) Natural zeolite particles with the particle size of 3-5 mm (refer to figure 1) are screened, washed by water and dried for later use.
(2) The heptadecafluorodecyl triethoxysilane is mixed with isopropanol to form a dilution of the heptadecafluorodecyl triethoxysilane with the mass percentage of 2.5 percent for standby.
(3) Mixing the zeolite particles with a diluent in an amount of 1g: mixing at a ratio of 350ml, standing for 10min, and taking out zeolite particles. And then continuously drying the zeolite particles for 80 minutes by blowing to obtain modified zeolite particles for standby.
(4) Mixing tricalcium aluminate powder, nano silicon dioxide and absolute ethyl alcohol, and performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 40%, wherein the tricalcium aluminate powder and the nano silicon dioxide are 1.0 weight part: 0.2 parts by weight. Mixing the slurry with modified zeolite particles according to 1.5 parts by weight: the mixture is placed in a drum mixer for 20min in a tumbling mixing mode according to the weight ratio of 0.8 part. And (3) performing steam curing (the temperature is 65 ℃ and the time is 2 hours, and the relative humidity is 95%) on the obtained zeolite particles after completion, thus obtaining the concrete mineral admixture aggregate.
Example 3
A preparation process of concrete mineral admixture aggregate comprises the following steps:
(1) Natural zeolite particles with the particle size of 3-5 mm (refer to figure 1) are screened, washed by water and dried for later use.
(2) The tridecyl fluorodecyl triethoxysilane is mixed with isopropanol to form a dilution of the heptadecyl fluorodecyl triethoxysilane with the mass percentage of 4.0 percent for standby.
(3) Mixing the zeolite particles with a diluent in an amount of 1g: mixing at a ratio of 200ml, standing for 10min, and taking out zeolite particles. And then drying the zeolite particles at 45 ℃ for 45min to obtain modified zeolite particles for standby.
(4) Mixing tetracalcium aluminoferrite powder, nano silicon dioxide and methanol (the mass concentration is 95%) and then performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 55%, wherein the tetracalcium aluminoferrite powder and the nano silicon dioxide are 1.0 weight part: 0.35 parts by weight. Mixing the slurry with modified zeolite particles according to 2.3 parts by weight: 1.0 parts by weight of the components are placed in a drum mixer for tumbling and mixing for 40 minutes. And (3) performing steam curing (the temperature is 50 ℃, the time is 3 hours, and the relative humidity is 90%) on the obtained zeolite particles after completion, thus obtaining the concrete mineral admixture aggregate.
Example 4
A preparation process of concrete mineral admixture aggregate comprises the following steps:
(1) Natural zeolite particles with the particle size of 3-5 mm (refer to figure 1) are screened, washed by water and dried for later use.
(2) The heptadecafluorodecyl triethoxysilane is mixed with isopropanol to form a diluent of the heptadecafluorodecyl triethoxysilane with the mass percentage of 3.0 percent for standby.
(3) Mixing the zeolite particles with a diluent in an amount of 1g:270ml of the zeolite particles were mixed and allowed to stand for 15 minutes. And then drying the zeolite particles at 60 ℃ for 30min to obtain modified zeolite particles for standby.
(4) Mixing tricalcium silicate powder and nano silicon dioxide with ethanol (the mass concentration is 95%) and then performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 51.2%, wherein the tricalcium silicate powder and the nano silicon dioxide are 1.0 weight part: 0.26 parts by weight. Mixing the slurry with modified zeolite particles according to 1.8 parts by weight: the mixture of 0.8 weight parts is put into a drum mixer for tumbling and mixing for 25min. And (3) performing steam curing (the temperature is 55 ℃ and the relative humidity is 95%) on the obtained zeolite particles after completion, thus obtaining the concrete mineral admixture aggregate.
Example 5
A preparation process of concrete mineral admixture aggregate comprises the following steps:
(1) Natural zeolite particles with the particle size of 3-5 mm (refer to figure 1) are screened, washed by water and dried for later use.
(2) Mixing the zeolite particles with isopropyl alcohol according to 1g: mixing at a ratio of 300ml, standing for 10min, and taking out zeolite particles. And then continuously drying the zeolite particles for 60min by blowing to obtain modified zeolite particles for standby.
(3) Mixing tricalcium silicate powder and nano silicon dioxide with ethanol (the mass concentration is 95%) and then performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 47.6%, wherein the tricalcium silicate powder and the nano silicon dioxide are 1.0 weight part: 0.3 parts by weight. Mixing the slurry with modified zeolite particles according to 2 parts by weight: the mixture of 0.9 parts by weight was placed in a drum mixer and tumble mixed for 30 minutes. And (3) performing steam curing (at 60 ℃ for 3 hours and with relative humidity of 95%) on the obtained zeolite particles after completion to obtain the concrete mineral admixture aggregate.
Example 6
A preparation process of concrete mineral admixture aggregate comprises the following steps:
(1) Natural zeolite particles with the particle size of 3-5 mm (refer to figure 1) are screened, washed by water and dried for later use.
(2) The heptadecafluorodecyl triethoxysilane is mixed with isopropanol to form a diluent of the heptadecafluorodecyl triethoxysilane with the mass percentage of 3.5 percent for standby.
(3) Mixing the zeolite particles with a diluent in an amount of 1g: mixing at a ratio of 300ml, standing for 10min, and taking out zeolite particles. And then continuously drying the zeolite particles for 60min by blowing to obtain modified zeolite particles for standby.
(4) Mixing tricalcium silicate powder and nano silicon dioxide with ethanol (the mass concentration is 95%) and then performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 47.6%, wherein the tricalcium silicate powder and the nano silicon dioxide are 1.0 weight part: 0.3 parts by weight. Mixing the slurry with modified zeolite particles according to 2 parts by weight: the mixture of 0.9 parts by weight was placed in a drum mixer and tumble mixed for 30 minutes. And heating the obtained zeolite particles for 3 hours at 60 ℃ under natural humidity after completion to obtain the concrete mineral admixture aggregate.
Example 7
A preparation process of concrete mineral admixture aggregate comprises the following steps:
(1) Natural zeolite particles with the particle size of 3-5 mm (refer to figure 1) are screened, washed by water and dried for later use.
(2) Mixing the zeolite particles with isopropyl alcohol according to 1g: mixing at a ratio of 350ml, standing for 10min, and taking out zeolite particles. And then continuously drying the zeolite particles for 80 minutes by blowing to obtain modified zeolite particles for standby.
(3) Mixing tricalcium aluminate powder, nano silicon dioxide and heptadecafluorodecyl triethoxysilane with isopropanol, and performing ultrasonic dispersion for 20min to obtain slurry with a solid content of 40%, wherein the tricalcium aluminate powder and the nano silicon dioxide are 1.0 weight part: 0.2 part by weight, and the slurry contains heptadecafluorodecyl triethoxysilane with the mass percentage of 2.5 percent. Mixing the slurry with modified zeolite particles according to 1.5 parts by weight: the mixture is placed in a drum mixer for 20min in a tumbling mixing mode according to the weight ratio of 0.8 part. And (3) performing steam curing (the temperature is 65 ℃ and the time is 2 hours, and the relative humidity is 95%) on the obtained zeolite particles after completion, thus obtaining the concrete mineral admixture aggregate.
Example 8
A preparation process of concrete mineral admixture aggregate comprises the following steps:
(1) Natural zeolite particles with the particle size of 3-5 mm (refer to figure 1) are screened, washed by water and dried for later use.
(2) The tridecyl fluorodecyl triethoxysilane is mixed with isopropanol to form a dilution of the heptadecyl fluorodecyl triethoxysilane with the mass percentage of 4.0 percent for standby.
(3) Mixing the zeolite particles with a diluent in an amount of 1g: mixing at a ratio of 200ml, standing for 10min, and taking out zeolite particles. And then drying the zeolite particles at 45 ℃ for 45min to obtain modified zeolite particles for standby.
(4) Mixing nano silicon dioxide and methanol (the mass concentration is 95%) and then performing ultrasonic dispersion for 20min to obtain slurry with the solid content of 55%. Mixing the slurry with modified zeolite particles according to 2.3 parts by weight: 1.0 parts by weight of the components are placed in a drum mixer for tumbling and mixing for 40 minutes. And (3) performing steam curing (the temperature is 50 ℃, the time is 3 hours, and the relative humidity is 90%) on the obtained zeolite particles after completion, thus obtaining the concrete mineral admixture aggregate.
Example 9
A preparation process of concrete mineral admixture aggregate comprises the following steps:
(1) Natural zeolite particles with the particle size of 3-5 mm (refer to figure 1) are screened, washed by water and dried for later use.
(2) The heptadecafluorodecyl triethoxysilane is mixed with isopropanol to form a diluent of the heptadecafluorodecyl triethoxysilane with the mass percentage of 3.0 percent for standby.
(3) Mixing the zeolite particles with a diluent in an amount of 1g:270ml of the zeolite particles were mixed and allowed to stand for 15 minutes. And then drying the zeolite particles at 60 ℃ for 30min to obtain modified zeolite particles for standby.
(4) And mixing tricalcium silicate powder with ethanol (the mass concentration is 95%) and then performing ultrasonic dispersion for 20min to obtain the slurry with the solid content of 51.2%. Mixing the slurry with modified zeolite particles according to 1.8 parts by weight: the mixture of 0.8 weight parts is put into a drum mixer for tumbling and mixing for 25min. And (3) performing steam curing (the temperature is 55 ℃ and the relative humidity is 95%) on the obtained zeolite particles after completion, thus obtaining the concrete mineral admixture aggregate.
Example 10
A preparation process of concrete mineral admixture aggregate comprises the following steps:
(1) Natural zeolite particles with the particle size of 3-5 mm (refer to figure 1) are screened, washed by water and dried for later use.
(2) The heptadecafluorodecyl triethoxysilane is mixed with isopropanol to form a diluent of the heptadecafluorodecyl triethoxysilane with the mass percentage of 3.0 percent for standby.
(3) Mixing the zeolite particles with a diluent in an amount of 1g:270ml of the zeolite particles were mixed and allowed to stand for 15 minutes. And then drying the zeolite particles at 60 ℃ for 30min to obtain the concrete mineral admixture aggregate.
Performance testing
Lightweight concrete (refer to fig. 2) was produced using the concrete mineral aggregate prepared in examples 1 to 10 as an aggregate. And then preparing the lightweight concrete into concrete test pieces according to the test method standard of physical and mechanical properties of concrete (GB/T50081-2019), and testing the 28d compressive strength of each concrete test piece according to the standard. The contact angle with water of the concrete test pieces prepared from the concrete mineral aggregate of each example was simultaneously tested to test the water-proof and anti-permeability capabilities of the concrete test pieces, and the results are shown in the following table. It can be seen that the lightweight concrete test pieces prepared by taking the concrete mineral blended aggregate prepared in examples 1-4 as aggregate have good mechanical properties and waterproof and impervious properties, namely the comprehensive properties are obviously better than those of other examples, because the zeolite is modified in examples 1-4 by adopting a special process, the defects existing when natural zeolite is taken as the lightweight aggregate are effectively overcome.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. A concrete mineral admixture aggregate, characterized in that the aggregate comprises zeolite particles, the pores of the zeolite particles contain a hydrophobic agent, the pores of the surface layer of the zeolite particles are filled with a component containing a hydratable filler and nano silicon dioxide, and the filler and the zeolite are bonded through partial hydration products in the filler;
the preparation of the concrete mineral admixture aggregate comprises the following steps:
(1) Mixing zeolite particles with a diluent to allow the zeolite particles to be absorbed into the zeolite particles, and then drying the zeolite particles to obtain modified zeolite particles; the diluent is formed by mixing a hydrophobizing agent and isopropanol;
(2) Preparing hydratable filler, nano silicon dioxide and liquid alcohol into slurry, filling the slurry into surface layer pores of the modified zeolite particles, and performing steam curing on the zeolite particles after completion to obtain concrete mineral admixture aggregate;
in the step (2), the hydratable filling comprises any one of tricalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite;
in the step (2), the liquid alcohol comprises any one of methanol and ethanol;
in the step (2), the temperature of steam curing is 50-65 ℃, the time is 2-3 hours, and the relative humidity is 90-95%.
2. The concrete mineral admixture according to claim 1, wherein the water repellent agent comprises any one of tridecafluorooctyltriethoxysilane, heptadecafluorodecyltriethoxysilane, n-octyltriethoxysilane, and isobutyltriethoxysilane.
3. The preparation process of the concrete mineral admixture aggregate is characterized by comprising the following steps of:
(1) Mixing zeolite particles with a diluent to allow the zeolite particles to be absorbed into the zeolite particles, and then drying the zeolite particles to obtain modified zeolite particles; the diluent is formed by mixing a hydrophobizing agent and isopropanol;
(2) Preparing hydratable filler, nano silicon dioxide and liquid alcohol into slurry, filling the slurry into surface layer pores of the modified zeolite particles, and performing steam curing on the zeolite particles after completion to obtain concrete mineral admixture aggregate;
bonding between the filler and the zeolite is achieved through partial hydration products in the filler;
in the step (2), the hydratable filling comprises any one of tricalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite;
in the step (2), the liquid alcohol comprises any one of methanol and ethanol;
in the step (2), the temperature of steam curing is 50-65 ℃, the time is 2-3 hours, and the relative humidity is 90-95%.
4. The process for preparing concrete mineral admixture aggregate according to claim 3, wherein in the step (1), the mass fraction of the water repellent in the diluent is 2.5 to 4%.
5. A process for preparing a concrete mineral admixture according to claim 3, wherein in step (1), the ratio of zeolite particles to diluent is 1g: 200-350 ml.
6. A process for preparing a concrete mineral admixture according to claim 3, wherein in the step (1), the zeolite particles have a particle diameter of 3 to 5mm.
7. A process for preparing a concrete mineral admixture according to claim 3, wherein in step (1), the drying means comprises any one of blow drying and heat drying.
8. The process for preparing a concrete mineral admixture according to claim 7, wherein the time of the air drying is 60 to 80 minutes.
9. The process for preparing concrete mineral admixture according to claim 7, wherein the temperature of the heating and drying is 45-60 ℃ and the drying time is 30-45 min.
10. A process for preparing a concrete mineral admixture according to claim 3, wherein in step (2), the weight ratio of the filler to the nano silica is 1.0 part: 0.2 to 0.35 parts.
11. The process for preparing a concrete mineral admixture according to claim 3, wherein in the step (2), the solid content of the slurry is 40-55% by mass.
12. A process for preparing a concrete mineral admixture according to claim 3, wherein the mass concentration of the liquid alcohol is not less than 95%.
13. The process for preparing a concrete mineral admixture according to claim 3, wherein in the step (2), the slurry and the modified zeolite particles are mixed together by tumbling in a tumbling mixer, and the slurry is filled in the pores of the surface layer of the modified zeolite particles.
14. The process for preparing concrete mineral admixture according to claim 13, wherein the tumbling mixing time is 20 to 40 minutes.
15. The process for preparing a concrete mineral admixture according to claim 13, wherein the ratio of the slurry to the modified zeolite particles is 1.5 to 2.3 parts by weight: 0.8 to 1.0 parts by weight.
16. Use of the concrete mineral admixture according to claim 1 or 2, or the concrete mineral admixture prepared by the preparation process according to any one of claims 3 to 15, in the field of construction engineering.
17. Use according to claim 16 as aggregate for lightweight concrete.
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|---|---|---|---|---|
| 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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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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