CN115504726A - Preparation method of slow-release hydrophobic microcapsule and hydrophobic concrete - Google Patents
Preparation method of slow-release hydrophobic microcapsule and hydrophobic concrete Download PDFInfo
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- CN115504726A CN115504726A CN202211145745.8A CN202211145745A CN115504726A CN 115504726 A CN115504726 A CN 115504726A CN 202211145745 A CN202211145745 A CN 202211145745A CN 115504726 A CN115504726 A CN 115504726A
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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
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a preparation method of a slow-release hydrophobic microcapsule and hydrophobic concrete, belonging to the field of building materials; the preparation method of the slow-release hydrophobic microcapsule comprises the following steps: compounding an acidic solution and a soluble fluoride to form a corrosive solution, etching the fly ash floating bead, and drying the sinking-bottom floating bead under mechanical stirring to obtain a perforated floating bead; then under the vacuum degree of-70 kPa to-80 kPa, the perforated floating beads are kept in a negative pressure state, then under the condition of keeping the vacuum degree unchanged, the floating beads are loaded with a water repellent, and finally, the soaking is carried out under normal pressure, so that the interior of the floating beads is fully loaded with the water repellent, and the slow release water repellent microcapsule is prepared; applying the prepared slow-release hydrophobic microcapsule to the preparation process of concrete to obtain hydrophobic concrete; the invention utilizes the slow release characteristic of the perforated floating bead and the nano silicon dioxide generated in the hydrolytic polycondensation process of the water repellent to cooperatively regulate and control the protective performance and the mechanical property of the hydrophobic concrete, thereby obviously improving the side effect of the water repellent on the performance of the concrete.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a sustained-release hydrophobic microcapsule and a preparation method of hydrophobic concrete.
Background
Concrete has a porous characteristic, is exposed to various environmental factors for a long time, and is easily subjected to harmful ions (Cl) taking water or other liquids as carriers - ，SO 4 2- Etc.) to cause corrosion of the steel bars, resulting in damage to the building structure and performance degradation; in particular, the absorption of chlorine-containing aqueous solutions, such as deicing salts or seawater, into concrete capillaries can lead to rapid corrosion of the steel reinforcement. Domestic and foreign research has shown that the corrosion of steel bars in concrete structures is mainly caused by moisture and other harmful substances (such as chloride ions) which invade into the concrete along with the diffusion of the moisture. Therefore, the concrete reduces the capillary water absorption performance and the water permeability of the concrete, delays the corrosion of various harmful substances taking water as a medium, and is an effective measure for improving the durability of a concrete structure and reducing the corrosion risk of internal steel bars.
There are various methods for enhancing the durability of concrete by increasing the compactness of the concrete, adding a rust inhibitor inside, or coating a protective layer on the outside. The surface coating can block gas or medium from entering the concrete to play a role in protection, but generally sacrifices the original appearance of the concrete substrate, and gradually loses the protection performance after being used for a period of time. Another effective method for controlling water entry is to use a water repellent to perform water-proof treatment on the concrete, and the silane water repellent is used as a permeable water-proof material and has good water-proof effect. The silane water repellent is different from other waterproof coatings, reduces the permeability of concrete, does not block capillary pores on the surface of the concrete, and enables the concrete to be subjected to waterproof treatmentThe concrete still has good air permeability and original appearance, and Ca (OH) is not influenced 2 Carbonisation to CaCO 3 The concrete has the advantages that the compaction effect of the concrete is improved, meanwhile, the reinforcement can be effectively prevented from being rusted, the reinforcement reacts with inorganic silicate molecules on the surface of the concrete to form stable chemical bonds and generate good hydrophobic effect, and the excellent properties ensure that the reinforcement does not bulge, crack and the like after being applied, and can be used in wear-resistant and corrosion-resistant occasions such as pavements.
However, the water repellent is an oily substance and has strong hydrophobicity, so that the hydration reaction of cement can be influenced when the water repellent is directly doped into concrete, the hydration degree is reduced, and the mechanical property is greatly reduced. Therefore, in order to alleviate the adverse effects of water repellent on the concrete properties, it is necessary to develop a novel additive delivery and release technique to alleviate the "adverse effects" caused by the incompatibility of the two.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a sustained-release hydrophobic microcapsule and a preparation method of hydrophobic concrete, which reduce the side effect of a hydrophobic agent on the performance of the concrete.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of a slow-release hydrophobic microcapsule comprises the following steps:
step 1: compounding an acidic solution and a soluble fluoride to form a corrosive solution, etching the fly ash floating bead, and drying the sinking-bottom floating bead under mechanical stirring to obtain a perforated floating bead;
step 2: firstly, under the vacuum degree of-70 kPa to-80 kPa, the perforated floating beads are kept in a negative pressure state, then the water repellent is sucked in under the condition of keeping the vacuum degree unchanged, the floating beads are loaded with the water repellent, and finally, the floating beads are soaked under the normal pressure, so that the interior of the floating beads is fully loaded with the water repellent, and the slow-release water repellent microcapsule is prepared.
Further, the acidic solution is one or more of hydrochloric acid, nitric acid and oxalic acid.
Further, the soluble fluoride in the step 1 is ammonium fluoride or sodium fluoride.
Further, the mass ratio of the acidic solution to the soluble fluoride is 1 (1-1.5).
Furthermore, the water repellent is one or a combination of more of organic siloxane, tetraethyl orthosilicate and a silane coupling agent are added, and the materials are uniformly mixed and compounded after being stirred.
The hydrophobic concrete comprises the following components in percentage by mass: 10-25% of cement, 40-55% of coarse aggregate, 20-30% of fine aggregate, 6-10% of water and 0.1-30% of slow-release hydrophobic microcapsule.
Further, the preparation method of the hydrophobic concrete comprises the following steps:
s1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the cement, the coarse aggregate and the fine aggregate;
s2, adding mixing water, and stirring to prepare slurry;
and S3, finally taking the slow-release hydrophobic microcapsules, performing saturated surface drying, dispersing and adding the slow-release hydrophobic microcapsules into the slurry, and stirring to obtain the hydrophobic concrete.
The invention has the beneficial effects that:
1. compared with hydrophobic concrete prepared by directly doping the water repellent, the problem of poor compatibility between the water repellent and a cement matrix is relieved, the slow release effect of the hydrophobic microcapsules can improve the mechanical property of the hydrophobic concrete, the hydrophobic effect of the hydrophobic concrete is improved, the durability of the concrete is enhanced, the volatilization of the water repellent in the mixing process and the hardening process is reduced, and the protection effect of the hydrophobic concrete is enhanced;
2. in the development process of concrete strength, tetraethyl orthosilicate or silane coupling agent components in the compound water repellent can undergo hydrolysis-polycondensation reaction to generate silicon dioxide particles in situ, so that secondary hydration is promoted, and the performance of concrete is further enhanced;
3. the invention adopts the perforated floating bead prepared by a chemical etching method, can promote the high value-added utilization of the floating bead and the large consumption of solid wastes; the prepared perforated floating bead can be used as an excellent microcapsule carrier, the shell material of the perforated floating bead is composed of inorganic silicon dioxide and aluminum oxide, the strength is higher, compared with the existing hydrophobic microcapsule, the perforated floating bead is a hard capsule carrier, in the actual application process, the survival capability of the microcapsule is obviously improved, and the microcapsule is not easy to break. When the hydrophobic microcapsule is prepared and applied to the field of construction, the original form of the microcapsule can still be maintained and not damaged in the process of mixing concrete. And the interface between the floating bead and the cement-based material is small, and because the silicon dioxide in the floating bead shell material has the activity of volcanic ash, the silicon dioxide can react with the cement-based material in the maintenance process, so that the interface is further strengthened, and the performance of concrete is enhanced.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a graph showing the results of the compression strength test of examples 1 to 3 of the present invention and comparative examples 1 to 4;
FIG. 2 is a graph showing the results of the capillary water absorption test in examples 1 to 3 of the present invention and comparative examples 1 to 4;
FIG. 3 is a graph showing the results of electric flux experiments in examples 1 to 3 of the present invention and comparative examples 1 to 4;
FIG. 4 is a graph showing the results of the contact angle test in example 3 of the present invention;
FIG. 5 is a graph showing the results of the contact angle test of comparative example 1 of the present invention;
FIG. 6 is a graph showing the results of the contact angle test of comparative example 4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A preparation method of a slow-release hydrophobic microcapsule comprises the following steps:
step 1, preparing perforated floating beads;
acid solutions such as hydrochloric acid, nitric acid, oxalic acid and the like are compounded with soluble fluorides (such as ammonium fluoride, sodium fluoride and the like) to form a corrosive solution, the floating beads (coal ash floating beads which are industrial byproducts are adopted) are etched, and the sinking-bottom floating beads are dried under mechanical stirring to prepare the perforated floating beads; wherein the molar ratio of the acidic solution to the soluble fluoride is 1 (1-1.5), and the reaction time is 8min-2h.
firstly, keeping the perforated floating beads in a negative pressure state for 2 hours under the vacuum degree of-70 kPa to-80 kPa, then sucking the water repellent in a negative pressure state under the condition of keeping the vacuum degree unchanged, loading the water repellent on the floating beads, keeping the temperature for 15 minutes, and finally soaking the floating beads for 12 hours under normal pressure to fully load the water repellent in the floating beads, thus obtaining the slow-release water repellent microcapsule.
Wherein, the water repellent in the step 2 selects organosilane or organosiloxane reagents with high permeability (such as isobutyl triethoxy silane, tetraethoxy silane and the like), and is mixed with tetraethyl orthosilicate and a silane coupling agent to be mixed uniformly and then compounded; the silicon dioxide particles are formed in situ by hydrolysis-polycondensation reaction of tetraethyl orthosilicate or a silane coupling agent in the cement-based material, so that the secondary hydration of concrete is promoted, the microstructure of the cement-based material is densified, the water resistance of the concrete is enhanced, and the mechanical property and the durability of the concrete are improved.
A hydrophobic concrete comprising: 10-25wt% of cement, 40-55wt% of coarse aggregate, 20-30wt% of fine aggregate, 6-10wt% of water and 0.1-10wt% of hydrophobic microcapsule.
The preparation method of the hydrophobic concrete comprises the following steps:
step 1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the cement, the coarse aggregate and the fine aggregate;
and 3, finally, taking a proper amount of hydrophobic microcapsules, performing saturated surface drying, dispersing and adding the hydrophobic microcapsules into the slurry, and stirring to obtain the hydrophobic concrete.
Principle analysis:
the floating bead is a hollow fly ash particle, the shell mainly comprises silicon dioxide and aluminum oxide, and the larger space in the shell can not be fully utilized, therefore, based on the principle of reaction of hydrofluoric acid and silicon dioxide, the invention etches a penetrating hole on the surface of the floating bead, provides a way for utilizing the internal space of the floating bead, so that the floating bead can be used as an excellent additive carrier, a hydrophobic agent is loaded by a vacuum saturation method, the release of the internal hydrophobic agent is controlled by utilizing the perforation on the surface of the floating bead, and the purpose of slow release is achieved, thereby relieving the negative effect of directly doping the hydrophobic agent on the mechanical property of concrete.
Secondly, by controlling the proportion of the corrosive liquid, perforation floating beads with different perforation apertures can be designed, and the release speed of the water repellent in the hydrophobic microcapsule can be regulated, so that the incompatibility of the water repellent and a cement matrix is reduced.
In the conventional organosilane or organosiloxane water repellent, tetraethyl orthosilicate or a silane coupling agent is added for compounding, so that the organosilane or organosiloxane in the composite water repellent has a protective effect on concrete, and simultaneously, the tetraethyl orthosilicate or the silane coupling agent can perform hydrolysis-polycondensation reaction in the concrete to form silica particles in situ, thereby further enhancing the performance of the concrete.
Hydrophobic concrete was prepared by setting 3 examples and 4 comparative examples below and tested for properties:
example 1 (PC 1):
a preparation method of a slow-release hydrophobic microcapsule comprises the following steps:
compounding hydrochloric acid and ammonium fluoride according to a molar ratio of 1.1 to form an acidic corrosive liquid, adding fly ash floating beads, stirring, corroding the surface, and drying a bottom-deposited part to prepare perforated floating beads; then keeping the perforated floating beads in a negative pressure state for 2 hours under the vacuum degree of-70 kPa to-80 kPa, then sucking a water repellent in a negative pressure state under the condition of keeping the vacuum degree unchanged, loading the water repellent on the floating beads, keeping the negative pressure for 15 minutes, and finally soaking for 12 hours under normal pressure to fully load the water repellent in the floating beads, thus obtaining the slow-release water repellent microcapsule.
The preparation method of the hydrophobic concrete comprises the following steps:
a hydrophobic concrete comprising: 14wt% of cement, 52wt% of coarse aggregate, 26wt% of fine aggregate, 7wt% of water and 1wt% of hydrophobic microcapsule.
Step 1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the cement, the coarse aggregate and the fine aggregate;
and 3, finally, taking a proper amount of hydrophobic microcapsules, performing saturated surface drying, dispersing and adding the hydrophobic microcapsules into the slurry, and stirring to obtain the hydrophobic concrete.
Example 2 (PC 3):
a preparation method of a slow-release hydrophobic microcapsule comprises the following steps:
adopting hydrochloric acid and ammonium fluoride, compounding according to a molar ratio of 1.1 to form an acidic corrosive liquid, adding fly ash floating beads, stirring, corroding the surface, taking a bottom-sinking part, and drying to prepare a perforated floating bead; then keeping the perforated floating beads in a negative pressure state for 2 hours under the vacuum degree of-70 kPa to-80 kPa, then sucking a water repellent in a negative pressure state under the condition of keeping the vacuum degree unchanged, loading the water repellent on the floating beads, keeping the negative pressure for 15 minutes, and finally soaking for 12 hours under normal pressure to fully load the water repellent in the floating beads, thus obtaining the slow-release water repellent microcapsule.
The preparation method of the hydrophobic concrete comprises the following steps:
a hydrophobic concrete comprising: 14wt% of cement, 52wt% of coarse aggregate, 24wt% of fine aggregate, 7wt% of water and 3wt% of hydrophobic microcapsule.
Step 1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the cement, the coarse aggregate and the fine aggregate;
and 3, finally, taking a proper amount of hydrophobic microcapsules, performing saturated surface drying, dispersing and adding the hydrophobic microcapsules into the slurry, and stirring to obtain the hydrophobic concrete.
Example 3 (PC 5):
a preparation method of a slow-release hydrophobic microcapsule comprises the following steps:
adopting hydrochloric acid and ammonium fluoride, compounding according to a molar ratio of 1.1 to form an acidic corrosive liquid, adding fly ash floating beads, stirring, corroding the surface, taking a bottom-sinking part, and drying to prepare a perforated floating bead; then keeping the perforated floating beads in a negative pressure state for 2 hours under the vacuum degree of-70 kPa to-80 kPa, then sucking a water repellent in a negative pressure state under the condition of keeping the vacuum degree unchanged, loading the water repellent on the floating beads, keeping the negative pressure for 15 minutes, and finally soaking for 12 hours under normal pressure to fully load the water repellent in the floating beads, thus obtaining the slow-release water repellent microcapsule.
The preparation method of the hydrophobic concrete comprises the following steps:
a hydrophobic concrete comprising: 14wt% of cement, 52wt% of coarse aggregate, 22wt% of fine aggregate, 7wt% of water and 5wt% of hydrophobic microcapsule.
Step 1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the cement, the coarse aggregate and the fine aggregate;
and 3, finally, taking a proper amount of hydrophobic microcapsules, and dispersing and adding the hydrophobic microcapsules into the slurry for stirring after the microcapsules are saturated and dried to obtain the hydrophobic concrete.
Comparative example 1 (C):
a hydrophobic concrete comprising: 14wt% of cement, 53wt% of coarse aggregate, 26wt% of fine aggregate, 7wt% of water and 0wt% of hydrophobic microcapsule.
The preparation steps are as follows:
step 1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the cement, the coarse aggregate and the fine aggregate;
the hydrophobic concrete is prepared.
Comparative example 2 (S1):
a hydrophobic concrete comprising: 14wt% of cement, 52wt% of coarse aggregate, 26wt% of fine aggregate, 7wt% of water, 0wt% of hydrophobic microcapsule and 1wt% of water repellent.
The preparation steps are as follows:
step 1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the cement, the coarse aggregate and the fine aggregate;
and 3, finally, directly adding a proper amount of water repellent into the slurry to be stirred to obtain the hydrophobic concrete.
Comparative example 3 (S3):
a hydrophobic concrete comprising: 14wt% of cement, 52wt% of coarse aggregate, 24wt% of fine aggregate, 7wt% of water, 0wt% of hydrophobic microcapsule and 3wt% of water repellent.
The preparation steps are as follows:
step 1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the cement, the coarse aggregate and the fine aggregate;
and 3, finally, directly adding a proper amount of water repellent into the slurry for stirring to obtain a hydrophobic concrete comparative example 4 (S5):
a hydrophobic concrete comprising: 14wt% of cement, 52wt% of coarse aggregate, 22wt% of fine aggregate, 7wt% of water, 0wt% of hydrophobic microcapsule and 5wt% of water repellent.
The preparation steps are as follows:
step 1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the cement, the coarse aggregate and the fine aggregate;
and 3, finally, directly adding a proper amount of water repellent into the slurry for stirring to obtain the hydrophobic concrete.
According to GB/T50081 Standard of ordinary concrete mechanical property test methods, pouring a cubic test piece of 100 multiplied by 100mm according to the component proportion in the embodiment, and testing the compression strength value of the concrete test piece by using a universal testing machine; according to GB/T50082 'test method standard for long-term performance and durability of common concrete', pouring a cylindrical test piece with the dimension of d multiplied by h =50 multiplied by 100mm, and testing the total electric flux value of the concrete test piece within 6h by using an electric flux tester; according to astm c1585, cylindrical test pieces with d × h =50 × 100mm were prepared, and the capillary water absorption performance of the concrete test pieces was evaluated by testing the change in the water absorption quality of the test pieces within 8 days.
FIG. 1 is data of compressive strength of hydrophobic concrete, and the incorporation of a water repellent significantly reduces the compressive strength of the concrete, negatively affecting the mechanical properties of the concrete; after the slow-release hydrophobic microcapsule is doped, compared with the method of directly doping the hydrophobic agent, the loss of mechanical strength is relieved, the mechanical property is increased, and the mechanical property is greatly reduced due to the incompatibility between the hydrophobic agent and a cement matrix; in addition, as can be seen from fig. 2 to 6, the hydrophobic microcapsules significantly improve the chloride ion permeation resistance and the capillary water absorption performance of the concrete, increase the static contact angle of the concrete, and improve the protective performance of the concrete.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (9)
1. A preparation method of a slow-release hydrophobic microcapsule is characterized by comprising the following steps:
step 1: compounding an acidic solution and a soluble fluoride to form a corrosive solution, etching the fly ash floating bead, and drying the sinking-bottom floating bead under mechanical stirring to obtain a perforated floating bead;
step 2: firstly, under the vacuum degree of-70 kPa to-80 kPa, the perforated floating beads are kept in a negative pressure state, then the floating beads are loaded with a water repellent under the condition of keeping the vacuum degree unchanged, and finally, the floating beads are soaked under normal pressure so as to fully load the water repellent in the floating beads, thus obtaining the slow-release hydrophobic microcapsule.
2. The method as claimed in claim 1, wherein in the step 1, the acidic solution is one or more of hydrochloric acid, nitric acid and oxalic acid.
3. The method for preparing the hydrophobic microcapsule with sustained release and release of the active ingredient as claimed in claim 1, wherein the soluble fluoride in step 1 is one or more of ammonium fluoride and sodium fluoride.
4. The method for preparing the sustained-release hydrophobic microcapsule as claimed in claim 1, wherein the mass ratio of the acidic solution to the soluble fluoride is 1 (1-1.5).
5. The method for preparing the sustained-release hydrophobic microcapsule as claimed in claim 1, wherein the water repellent is one or more of organic silane, tetraethyl orthosilicate and silane coupling agent are added, and the mixture is mixed uniformly after stirring for compounding.
6. A hydrophobic sustained release microcapsule prepared by the method of any one of claims 1 to 5.
7. The use of the hydrophobic microcapsules of claim 6 for the preparation of hydrophobic concrete.
8. The hydrophobic concrete, the composition of which comprises the sustained-release hydrophobic microcapsule of claim 6, wherein the hydrophobic concrete comprises the following components in percentage by mass: 10-25% of cement, 40-55% of coarse aggregate, 20-30% of fine aggregate, 6-10% of water and 0.1-30% of slow-release hydrophobic microcapsule.
9. The method for preparing the hydrophobic concrete of claim 8, comprising the steps of:
s1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the cement, the coarse aggregate and the fine aggregate;
s2, adding mixing water, and stirring to prepare slurry;
and S3, finally taking the slow-release hydrophobic microcapsules, performing saturated surface drying, dispersing and adding the slow-release hydrophobic microcapsules into the slurry, and stirring to obtain the hydrophobic concrete.
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| CN117602892A (en) * | 2023-12-06 | 2024-02-27 | 东北农业大学 | Light nano modified microbead reinforced geopolymer foam concrete and preparation method thereof |
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