CN115504726B - 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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- CN115504726B CN115504726B CN202211145745.8A CN202211145745A CN115504726B CN 115504726 B CN115504726 B CN 115504726B CN 202211145745 A CN202211145745 A CN 202211145745A CN 115504726 B CN115504726 B CN 115504726B
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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
Abstract
The invention discloses a slow-release hydrophobic microcapsule and a preparation method of hydrophobic concrete, belonging to the field of building materials; the preparation method of the slow-release hydrophobic microcapsule comprises the following steps: etching the fly ash floating beads by utilizing an acidic solution and a soluble fluoride to form an etching solution, and drying the bottom floating beads under mechanical stirring to prepare perforated floating beads; then, the perforated floating beads are kept in a negative pressure state under the vacuum degree of-70 kPa to-80 kPa, then the floating beads are loaded with a water repellent under the condition of keeping the vacuum degree unchanged, and finally are soaked under normal pressure, so that the inside of the floating beads is fully loaded with the water repellent, and the slow-release water repellent microcapsule is prepared; the prepared slow-release hydrophobic microcapsule is applied to the preparation process of concrete to obtain hydrophobic concrete; according to the invention, the protective performance and the mechanical performance of the hydrophobic concrete are enhanced by utilizing the slow release characteristic of the perforated floating beads and the synergistic regulation and control of the nano silicon dioxide generated in the hydrolytic polycondensation process of the hydrophobic agent, so that the side effect of the hydrophobic agent on the concrete performance is obviously improved.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a slow-release hydrophobic microcapsule and a preparation method of hydrophobic concrete.
Background
Concrete has porous characteristics, and is exposed to various environmental factors for a long time and is easy to be subjected to harmful ions (Cl) taking water or other liquids as carriers - ，SO 4 2- Etc.), resulting in corrosion of the steel bar, damage to the building structure and deterioration of performance; in particular, absorption of chlorine-containing aqueous solutions, such as deicing salts or seawater, by concrete capillaries can lead to rapid corrosion of the rebar. Research at home and abroad has shown that steel reinforcement corrosion in concrete structures is mainly caused by moisture and other various harmful substances (such as chloride ions) which invade the interior of the concrete along with the diffusion of the moisture. Therefore, the capillary water absorption performance and the water permeability of the concrete are reduced, the erosion of various harmful substances taking water as a medium is delayed, and the method is an effective measure for improving the durability of the concrete structure and reducing the corrosion risk of internal reinforcing steel bars.
There are various methods for enhancing durability of concrete by improving compactness of concrete, internally adding a rust inhibitor, or externally coating a protective layer. The surface coating can block gas or medium from entering the interior of the concrete so as to play a role in protection, but generally sacrifices the original appearance of the concrete base material, and gradually loses the protection performance after a period of use. Another effective method for controlling the entry of moisture is to use a water repellent to waterproof concrete, and the silane water repellent is used as a permeable waterproof material and has good waterproof effect. The silane water repellent is different from other waterproof coatings, and does not block capillary pores on the surface of the concrete while reducing the permeability of the concrete, so that the concrete subjected to the waterproof treatment still has good air permeability and original appearance, and Ca (OH) cannot be influenced 2 Carbonization into CaCO 3 Therefore, the compaction effect of the concrete is improved, meanwhile, the corrosion of the steel bars can be effectively prevented, stable chemical bonds are formed by the reaction of the steel bars and inorganic silicate molecules on the surface of the concrete, a good hydrophobic effect is produced, and the excellent properties ensure that the steel bars cannot bulge, crack and the like after being applied, and can be used in occasions such as pavement with wear resistance and corrosion resistance.
However, since the water repellent is an oily substance and has strong hydrophobicity, the water repellent is directly doped into concrete to affect the hydration reaction of cement, reduce the hydration degree and greatly reduce the mechanical property. Therefore, in order to alleviate the adverse effects of water repellent on concrete properties, it is necessary to develop new admixture delivery and release techniques to alleviate the "side effects" caused by incompatibility of the two.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a slow-release hydrophobic microcapsule and a preparation method of hydrophobic concrete, which lighten the side effect of a water repellent on the performance of the concrete.
The aim of the invention can be achieved by the following technical scheme:
a preparation method of a slow-release hydrophobic microcapsule comprises the following steps:
step 1: etching the fly ash floating beads by utilizing an acidic solution and a soluble fluoride to form an etching solution, and drying the bottom floating beads under mechanical stirring to prepare perforated floating beads;
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 negative pressure is sucked into the water repellent under the condition of keeping the vacuum degree unchanged, the floating beads are enabled to load the water repellent, and finally, the floating beads are soaked under normal pressure, so that the water repellent is fully loaded inside the floating beads, 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).
Further, the water repellent is one or a combination of a plurality of organic siloxanes, tetraethyl orthosilicate and a silane coupling agent are mixed, and the mixture is uniformly mixed for compounding after stirring.
A 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 microcapsules.
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 materials;
s2, adding mixing water to stir to prepare slurry;
and S3, finally taking the slow-release hydrophobic microcapsules, dispersing the slow-release hydrophobic microcapsules into the slurry after saturation and drying, and stirring to obtain the hydrophobic concrete.
The invention has the beneficial effects that:
1. compared with the hydrophobic concrete prepared by directly doping the hydrophobic agent, the method has the advantages that the problem of poor compatibility between the hydrophobic agent and the cement matrix is solved, the slow release effect of the hydrophobic microcapsule 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, and the volatilization of the hydrophobic agent in the mixing process and the hardening process is reduced, so that the protection effect of the hydrophobic concrete is enhanced;
2. in the process of the development of the strength of the concrete, tetraethyl orthosilicate or a silane coupling agent component in the compound water repellent can generate hydrolysis-polycondensation reaction in situ to generate silicon dioxide particles, so that the secondary hydration is promoted, and the performance of the concrete is further enhanced;
3. the floating beads are used as hollow fly ash particles, belong to industrial solid wastes, and are prepared by adopting a chemical etching method, so that the high value-added utilization of the floating beads and the bulk consumption of solid wastes can be promoted; the prepared perforated floating beads can be used as an excellent microcapsule carrier, the shell material of the perforated floating beads consists of inorganic silicon dioxide and aluminum oxide, the strength is higher, and compared with the existing hydrophobic microcapsule, the perforated floating beads are hard capsule carriers, and in the practical application process, the viability of the microcapsule is obviously improved, and the microcapsule is not easy to break. When the prepared hydrophobic microcapsule is applied to the field of construction, the original shape of the microcapsule can be maintained without being destroyed in the concrete mixing process. And the interface between the floating beads and the cement-based material is smaller, and the silicon dioxide in the floating bead shell material has pozzolanic activity and can react with the cement-based material in the curing process, so that the interface is further reinforced, and the performance of the concrete is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a graph showing the results of compressive strength experiments of examples 1 to 3 and comparative examples 1 to 4 according to the present invention;
FIG. 2 is a graph showing the results of capillary water absorption experiments of examples 1 to 3 and comparative examples 1 to 4 according to the present invention;
FIG. 3 is a graph showing the results of the electric flux experiments of examples 1 to 3 and comparative examples 1 to 4 according to the present invention;
FIG. 4 is a graph showing the experimental results of the contact angle of example 3 of the present invention;
FIG. 5 is a graph showing the experimental results of contact angle of comparative example 1 of the present invention;
FIG. 6 is a graph showing the results of contact angle experiments of comparative example 4 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A preparation method of a slow-release hydrophobic microcapsule comprises the following steps:
step 1, preparing perforated floating beads;
etching floating beads (adopting industrial byproducts of fly ash floating beads) by utilizing acid solutions such as hydrochloric acid, nitric acid, oxalic acid and the like to be compounded with soluble fluorides (such as ammonium fluoride, sodium fluoride and the like) to form an etching solution, and drying the floating beads at the bottom of the sediment under mechanical stirring to obtain perforated floating beads; wherein the mol ratio of the acid solution to the soluble fluoride is 1 (1-1.5), and the reaction time is 8min-2h.
Step 2, loading a water repellent by using a vacuum saturation method;
firstly, under the vacuum degree of-70 kPa to-80 kPa, the perforated floating beads are kept in a negative pressure state for 2 hours, then the negative pressure is absorbed into the water repellent under the condition of keeping the vacuum degree unchanged, the floating beads are enabled to load the water repellent, the water repellent is kept for 15 minutes, and finally, the floating beads are soaked for 12 hours under normal pressure, so that the water repellent is fully loaded in the floating beads, and the slow-release water repellent microcapsule is prepared.
Wherein, the water repellent in the step 2 is selected from organosilane or organosiloxane reagents (such as isobutyl triethoxysilane, tetraethoxysilane, etc.) with high permeability, and tetraethyl orthosilicate and silane coupling agent are mixed and uniformly stirred for compounding; the Si-O bond is formed between the silane hydrolysis and the cement matrix, so that the organic hydrophobic group faces the outer side of the pore, the hydrophobic effect is realized, and the hydrolysis-polycondensation reaction of tetraethyl orthosilicate or a silane coupling agent in the cement matrix material is utilized to form silica particles in situ, so that the secondary hydration of concrete is promoted, the microstructure of the cement matrix is densified, and the mechanical property and durability of the concrete are improved while the waterproof property of the concrete is enhanced.
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, cement, coarse aggregate and fine aggregate are added and fully stirred to be uniformly dispersed;
step 2, adding mixing water to stir;
and step 3, finally, taking a proper amount of hydrophobic microcapsules, and dispersing the hydrophobic microcapsules into the slurry after saturation and drying, 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 inside the shell is not fully utilized, so the invention etches penetrating holes on the surface of the floating bead based on the reaction principle of hydrofluoric acid and silicon dioxide, provides a way for utilizing the space inside the floating bead, can be used as an excellent additive carrier, loads the water repellent through a vacuum saturation method, and controls the release of the water repellent inside by utilizing the perforation on the surface of the floating bead so as to achieve the aim of slow release, thereby relieving the negative influence of the direct doping of the water repellent on the mechanical property of concrete.
Secondly, through controlling the proportion of the corrosive liquid, perforated floating beads with different perforated apertures can be designed, and the release speed of the water repellent inside the water repellent microcapsule is regulated and controlled, 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 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 meanwhile, the tetraethyl orthosilicate or the silane coupling agent can perform hydrolysis-polycondensation reaction in the concrete to form silica particles in situ, so that the performance of the concrete is further enhanced.
The following hydrophobic concrete was prepared by setting 3 examples and 4 comparative examples, and its properties were tested:
example 1 (PC 1):
a preparation method of a slow-release hydrophobic microcapsule comprises the following steps:
hydrochloric acid and ammonium fluoride are adopted to be compounded according to the mol ratio of 1:1.1 to form acidic corrosive liquid, fly ash floating beads are added to be stirred, after the surface corrosion, the sinking bottom part is taken to be dried to prepare perforated floating beads; then, under the vacuum degree of-70 kPa to-80 kPa, the perforated floating beads are kept in a negative pressure state for 2 hours, then the negative pressure is sucked into the water repellent under the condition of keeping the vacuum degree unchanged, the floating beads are enabled to load the water repellent, the water repellent is kept for 15 minutes under the negative pressure, and finally, the floating beads are soaked for 12 hours under normal pressure, so that the water repellent is fully loaded in the floating beads, and the slow-release water repellent microcapsule is prepared.
The preparation method of the hydrophobic concrete comprises the following steps:
a hydrophobic concrete comprising: 14% of cement, 52% of coarse aggregate, 26% of fine aggregate, 7% of water and 1% of hydrophobic microcapsule.
Step 1, cement, coarse aggregate and fine aggregate are added and fully stirred to be uniformly dispersed;
step 2, adding mixing water to stir;
and step 3, finally, taking a proper amount of hydrophobic microcapsules, and dispersing the hydrophobic microcapsules into the slurry after saturation and drying, and stirring to obtain the hydrophobic concrete.
Example 2 (PC 3):
a preparation method of a slow-release hydrophobic microcapsule comprises the following steps:
hydrochloric acid and ammonium fluoride are adopted to be compounded according to the mol ratio of 1:1.1 to form acidic corrosive liquid, fly ash floating beads are added to be stirred, after the surface corrosion, the sinking bottom part is taken to be dried to prepare perforated floating beads; then, under the vacuum degree of-70 kPa to-80 kPa, the perforated floating beads are kept in a negative pressure state for 2 hours, then the negative pressure is sucked into the water repellent under the condition of keeping the vacuum degree unchanged, the floating beads are enabled to load the water repellent, the water repellent is kept for 15 minutes under the negative pressure, and finally, the floating beads are soaked for 12 hours under normal pressure, so that the water repellent is fully loaded in the floating beads, and the slow-release water repellent microcapsule is prepared.
The preparation method of the hydrophobic concrete comprises the following steps:
a hydrophobic concrete comprising: 14% of cement, 52% of coarse aggregate, 24% of fine aggregate, 7% of water and 3% of hydrophobic microcapsule.
Step 1, cement, coarse aggregate and fine aggregate are added and fully stirred to be uniformly dispersed;
step 2, adding mixing water to stir;
and step 3, finally, taking a proper amount of hydrophobic microcapsules, and dispersing the hydrophobic microcapsules into the slurry after saturation and drying, and stirring to obtain the hydrophobic concrete.
Example 3 (PC 5):
a preparation method of a slow-release hydrophobic microcapsule comprises the following steps:
hydrochloric acid and ammonium fluoride are adopted to be compounded according to the mol ratio of 1:1.1 to form acidic corrosive liquid, fly ash floating beads are added to be stirred, after the surface corrosion, the sinking bottom part is taken to be dried to prepare perforated floating beads; then, under the vacuum degree of-70 kPa to-80 kPa, the perforated floating beads are kept in a negative pressure state for 2 hours, then the negative pressure is sucked into the water repellent under the condition of keeping the vacuum degree unchanged, the floating beads are enabled to load the water repellent, the water repellent is kept for 15 minutes under the negative pressure, and finally, the floating beads are soaked for 12 hours under normal pressure, so that the water repellent is fully loaded in the floating beads, and the slow-release water repellent microcapsule is prepared.
The preparation method of the hydrophobic concrete comprises the following steps:
a hydrophobic concrete comprising: 14% of cement, 52% of coarse aggregate, 22% of fine aggregate, 7% of water and 5% of hydrophobic microcapsule.
Step 1, cement, coarse aggregate and fine aggregate are added and fully stirred to be uniformly dispersed;
step 2, adding mixing water to stir;
and step 3, finally, taking a proper amount of hydrophobic microcapsules, and dispersing the hydrophobic microcapsules into the slurry after saturation and drying, and stirring to obtain the hydrophobic concrete.
Comparative example 1 (C):
a hydrophobic concrete comprising: 14% of cement, 53% of coarse aggregate, 26% of fine aggregate, 7% of water and 0% of hydrophobic microcapsule.
The preparation method comprises the following steps:
step 1, cement, coarse aggregate and fine aggregate are added and fully stirred to be uniformly dispersed;
step 2, adding mixing water to stir;
the hydrophobic concrete is prepared.
Comparative example 2 (S1):
a hydrophobic concrete comprising: 14% of cement, 52% of coarse aggregate, 26% of fine aggregate, 7% of water, 0% of hydrophobic microcapsule and 1% of water repellent.
The preparation method comprises the following steps:
step 1, cement, coarse aggregate and fine aggregate are added and fully stirred to be uniformly dispersed;
step 2, adding mixing water to stir;
and 3, finally, a proper amount of water repellent is directly added into the slurry to be stirred, so that the hydrophobic concrete is prepared.
Comparative example 3 (S3):
a hydrophobic concrete comprising: 14% of cement, 52% of coarse aggregate, 24% of fine aggregate, 7% of water, 0% of hydrophobic microcapsule and 3% of water repellent.
The preparation method comprises the following steps:
step 1, cement, coarse aggregate and fine aggregate are added and fully stirred to be uniformly dispersed;
step 2, adding mixing water to stir;
and 3, finally, a proper amount of water repellent is directly added into the slurry to be stirred, so that the hydrophobic concrete comparative example 4 is prepared (S5):
a hydrophobic concrete comprising: 14% of cement, 52% of coarse aggregate, 22% of fine aggregate, 7% of water, 0% of hydrophobic microcapsule and 5% of water repellent.
The preparation method comprises the following steps:
step 1, cement, coarse aggregate and fine aggregate are added and fully stirred to be uniformly dispersed;
step 2, adding mixing water to stir;
and 3, finally, a proper amount of water repellent is directly added into the slurry to be stirred, so that the hydrophobic concrete is prepared.
According to the component proportion in the embodiment of GB/T50081 standard of common concrete mechanical property test method, casting a 100X 100mm cube test piece, and testing the compressive strength value of the concrete test piece by using a universal tester; according to GB/T50082 Standard of method for testing the long-term performance and durability of ordinary concrete, casting a cylindrical test piece with d×h=50×100mm, and testing the total electric flux value of the concrete test piece within 6h by adopting an electric flux tester; according to astm c1585, cylindrical test pieces of d×h=50×100mm were prepared, and capillary water absorption properties of concrete test pieces were evaluated by testing the change in water absorption mass of the test pieces over 8 days.
FIG. 1 is a graph showing compressive strength data of a hydrophobic concrete, wherein the compressive strength value of the concrete is remarkably reduced by adding a water repellent, and the mechanical property of the concrete is negatively affected; after the slow-release hydrophobic microcapsules are doped, compared with the direct doping of the hydrophobic agents, the slow-release hydrophobic microcapsules relieve the loss of mechanical strength, increase the mechanical properties, and effectively improve the incompatibility between the hydrophobic agents and the cement matrix to greatly reduce the mechanical properties; in addition, as can be seen in fig. 2-6, the hydrophobic microcapsules significantly improve the chloride ion permeation resistance and 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 of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal 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, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (8)
1. The preparation method of the slow-release hydrophobic microcapsule is characterized by comprising the following steps of:
step 1: etching the fly ash floating beads by utilizing an acidic solution and a soluble fluoride to form an etching solution, and drying the bottom floating beads under mechanical stirring to prepare perforated floating beads;
step 2: firstly, under the vacuum degree of-70 kPa to-80 kPa, making perforated floating beads keep a negative pressure state, then making the floating beads load a water repellent under the condition of keeping the vacuum degree unchanged, and finally soaking under normal pressure to make the inside of the floating beads fully loaded with the water repellent, thus obtaining the slow-release water repellent microcapsule;
the water repellent is one or a combination of a plurality of organic silanes, tetraethyl orthosilicate and a silane coupling agent are mixed, and the mixture is uniformly mixed for compounding after stirring.
2. The method for preparing a slow release hydrophobic micro-capsule according to 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 of claim 1, wherein the soluble fluoride in step 1 is one or more of ammonium fluoride and sodium fluoride.
4. The method for preparing a slow release hydrophobic micro-capsule according to claim 1, wherein the mass ratio of the acidic solution to the soluble fluoride is 1 (1-1.5).
5. A slow release hydrophobic microcapsule prepared by the method of any one of claims 1-4.
6. Use of the slow release hydrophobic microcapsules of claim 5 in the preparation of hydrophobic concrete.
7. A hydrophobic concrete comprising the slow release hydrophobic microcapsules of claim 5, wherein the hydrophobic concrete comprises the following components in mass ratio: 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 microcapsules.
8. A method of preparing the hydrophobic concrete of claim 7, comprising the steps of:
s1, adding cement, coarse aggregate and fine aggregate, and fully stirring to uniformly disperse the materials;
s2, adding mixing water to stir to prepare slurry;
and S3, finally taking the slow-release hydrophobic microcapsules, dispersing the slow-release hydrophobic microcapsules into the slurry after saturation and drying, and stirring to obtain the hydrophobic concrete.
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