CN114477917A - Super-hydrophobic concrete and use method thereof - Google Patents
Super-hydrophobic concrete and use method thereof Download PDFInfo
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- CN114477917A CN114477917A CN202210212737.4A CN202210212737A CN114477917A CN 114477917 A CN114477917 A CN 114477917A CN 202210212737 A CN202210212737 A CN 202210212737A CN 114477917 A CN114477917 A CN 114477917A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses super-hydrophobic concrete which comprises cement, sand, a water-based hydrophobic admixture and special composite fibers, wherein the super-hydrophobic concrete comprises the following raw materials in parts by weight: 1000 parts of cement, 800 parts of sand, 1200 parts of water-based hydrophobic admixture and 30-60 parts of special composite fiber. The super-hydrophobic concrete adopts a mode of combining the water-based hydrophobic admixture and the special composite fiber with the concrete base material, namely cement and sand, so that the common concrete has super-hydrophobic performance, wherein the special composite fiber can improve the bending resistance, tensile strength, impact resistance and other performances of the cement-based concrete material and is beneficial to forming a hydrophobic porous net structure; the concrete cementing material has hydrophobic property due to the addition of the water-based hydrophobic admixture, and meanwhile, the water-based hydrophobic admixture can be well dispersed in the concrete cementing material to form a nano-micron porous network structure on the surface layer of the concrete, so that the concrete has super-hydrophobic property.
Description
Technical Field
The invention relates to the technical field of concrete and use of concrete, in particular to super-hydrophobic concrete and a preparation method thereof.
Background
The concrete is used as a main material for engineering construction, has the excellent properties of easy casting formability, high impact resistance, high strength and stability after being combined with a framework and the like, and therefore has an irreplaceable effect in infrastructure construction. The concrete is a porous material with more surface micropores, after water is contacted with the solidified concrete, the water can be adsorbed to the external surface by the capillary action produced by the micropores on the surface of the concrete, then the water can be gradually infiltrated into the internal structure of the concrete, if the water contains Cl-、SO-4 2Ions which can have an erosive effect on the concrete, and the ions can followThe water penetrates into the concrete to cause the corrosion damage of the concrete and the internal steel reinforcement framework.
In general, reinforced concrete structures do not face large amounts of Cl in ordinary use environments-、SO-4 2、Mg2+Etc., and the concrete can show good durability even in such an environment, and the use rate of the concrete in a common environment is very high, so that research on the improvement of the concrete performance is mainly focused on the strength of the concrete structure, and neglects the problem that the concrete structure has poor durability in special environments such as water immersion and moisture, and the problem that the concrete structure can be irreversibly damaged by overcast and rainy water in south for a long time, and therefore, the cost is huge.
In recent years, with the rapid development of economy in China, not only urban and rural construction is rapidly developed, but also infrastructure construction such as bridge construction, highway paving and the like enters a high-speed development stage, and a large amount of concrete cannot be used in various engineering constructions. The concrete used in the prior art has the defects of poor water resistance, easy erosion and the like, and influences the long-term stability of engineering construction to a certain extent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides concrete with high structural strength and super-hydrophobic surface and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the super-hydrophobic concrete is composed of cement, sand, a water-based hydrophobic admixture and special composite fibers, wherein the super-hydrophobic concrete comprises the following raw materials in parts by weight: 1000 parts of cement, 800 parts of sand, 1200 parts of water-based hydrophobic admixture and 30-60 parts of special composite fiber.
Further, the cement is P.O42.5 ordinary portland cement.
Further, the sand is fine sand screened by a 60-mesh fine screen.
Further, the water-based hydrophobic admixture is organosilicon hydrophobic modified water-based polyurethane.
Further, the preparation method of the organosilicon hydrophobic modified waterborne polyurethane comprises the following steps: putting hydroxyl polydimethylsiloxane, polytetramethylene ether glycol and dimethyl pentamethylene diamine into a reaction container, stirring at a certain temperature, adding isophorone diisocyanate and an organic bismuth catalyst DY-20, reacting at a controlled temperature for a certain time, adding isophorone diisocyanate and 1, 4-dihydroxy butane to react to obtain an aqueous polyurethane-silicon prepolymer, sequentially adding acetone and triethylamine to continue reacting, adding deionized water under high-speed stirring to emulsify, adding ethylenediamine sodium ethanesulfonate and ethylenediamine to obtain a hydrophobic silicon-aqueous polyurethane emulsion, and finally adding KH550 to react to obtain the organosilicon hydrophobic modified aqueous polyurethane. The organosilicon hydrophobic modified waterborne polyurethane is used as a waterborne hydrophobic admixture, can be uniformly blended with other materials and water in a concrete material, and avoids the problems that in the process of preparing super-hydrophobic concrete by blending fluorosilicone, polysiloxane and the like with a concrete base material in the prior art, the raw materials such as the fluorosilicone, the polysiloxane and the like are difficult to uniformly disperse in the concrete base material and the water, aggregation and the like are easy to occur, so that the cured concrete is difficult to realize super-hydrophobic performance.
Further, the special composite fiber is composed of micron-sized calcium sulfate whiskers and alkali-resistant glass fibers, wherein the mass ratio of the calcium sulfate whiskers to the alkali-resistant glass fibers is 1-3:1, namely 1-3 parts by mass of the calcium sulfate whiskers are mixed with 1 part by mass of the alkali-resistant glass fibers to obtain the special composite fiber. The calcium sulfate whisker is short fiber, can be added into concrete products to strengthen, toughen and improve the tensile strength and the like, and the special composite fiber composed of micron-sized calcium sulfate whisker and alkali-resistant glass fiber can form a coating surface with certain roughness on the surface of concrete, the water-based hydrophobic admixture has good binding degree with the water-based hydrophobic admixture, and the water-based hydrophobic admixture can be well filled among micron-sized special composite fiber materials on the surface of a concrete large-particle material to form surface concave-convex from nanometer to micron on the surface of the concrete, the surface concave-convex of the whole surface layer is connected into a continuous porous net-shaped structure, the concave-convex parts can prevent water from permeating into the grooves because air exists in the grooves with concave-convex surfaces, and a structure similar to an air cushion is formed on the surface, so that the super-hydrophobic concrete has very strong hydrophobic property.
The invention also provides a using method of the super-hydrophobic concrete, which comprises the following steps:
(1) preparing the following raw materials in parts by weight: 1000 parts of cement, 800 parts of sand and 1200 parts of water-based hydrophobic admixture, 10-20 parts of special composite fiber and 500 parts of water and 600 parts of water;
(2) fully and uniformly mixing ordinary portland cement, fine sand and special composite fibers, adding water, and fully and uniformly stirring to obtain concrete slurry;
(3) adding a water-based hydrophobic admixture into the concrete slurry and fully and uniformly mixing to obtain hydrophobic concrete slurry;
(4) and pouring, hardening and forming the obtained hydrophobic concrete slurry to obtain the super-hydrophobic concrete structure.
Compared with the prior art, the invention has the beneficial effects that:
the super-hydrophobic concrete of the invention adopts a mode of combining the water-based hydrophobic admixture and the special composite fiber with the concrete base material-cement and sand to ensure that the common concrete has the super-hydrophobic performance, wherein the special composite fiber can improve the bending resistance, tensile resistance, shock resistance and other performances of the cement-based concrete material and enhance the anti-shrinkage performance, early anti-cracking performance and other performances of the cement-based cementing material, meanwhile, the special composite fiber plays a role in enhancing the interface fusion of the concrete, the interface combination performance of the fiber concrete is improved, and the micron-sized special composite fiber can form micron-sized bulges on the surface of the formed concrete, thereby forming a hydrophobic porous reticular structure; the concrete cementing material has hydrophobic property due to the addition of the water-based hydrophobic admixture, meanwhile, the water-based hydrophobic admixture can be well dispersed in the concrete cementing material, the aggregation phenomenon can not occur, and the water-based hydrophobic admixture can fill large particles on the surface layer of the concrete and large gaps among the protrusions of the micron-sized fibers, so that a nano-micron porous network structure is formed on the surface layer of the concrete, and the concrete has super-hydrophobic property.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1: the super-hydrophobic concrete is composed of cement, sand, a water-based hydrophobic admixture and special composite fibers, wherein the super-hydrophobic concrete comprises the following raw materials in parts by weight: 1000 parts of cement, 1000 parts of sand, 15 parts of a water-based hydrophobic admixture and 45 parts of special composite fiber.
Further, the cement is P.O42.5 ordinary portland cement; the sand is fine sand screened by a 60-mesh fine screen; the special composite fiber consists of micron-sized calcium sulfate whiskers and alkali-resistant glass fibers, wherein the mass ratio of the calcium sulfate whiskers to the alkali-resistant glass fibers is 2: 1.
Further, the aqueous hydrophobic admixture is organosilicon hydrophobic modified aqueous polyurethane; the specific preparation method of the organosilicon hydrophobic modified waterborne polyurethane comprises the following steps: putting 10 parts of hydroxy polydimethylsiloxane, 4 parts of polytetramethylene ether glycol and 2 parts of dimethyl pentamethylene diamine into a reaction container, stirring for 15min at 55 ℃, then adding 3 parts of isophorone diisocyanate and 0.05 part of organic bismuth catalyst DY-20, keeping the temperature, reacting for 30min, heating to 90 ℃, reacting for 2h, cooling to 70 ℃, adding 1 part of isophorone diisocyanate and 2 parts of 1, 4-dihydroxy butane, reacting for 3h to obtain an aqueous polyurethane-silicon prepolymer, then adding a proper amount of acetone to reduce the system viscosity, adding 5 parts of triethylamine at 40 ℃, continuing to react for 0.5h, finally adding 10 parts of deionized water under high-speed stirring for emulsification, adding 2 parts of ethylenediamine sodium ethanesulfonate and 5 parts of ethylenediamine, reacting for 2h to obtain a hydrophobic silicon-aqueous polyurethane emulsion, and finally adding 10 parts of KH550 at 40 ℃ to react for 1h to obtain the organosilicon hydrophobic modified aqueous polyurethane, the parts described in the present example are all the preferred parts by mass, and the desired product may still be obtained with modifications to the parts by mass in the other examples.
Example 2: the super-hydrophobic concrete is composed of cement, sand, a water-based hydrophobic admixture and special composite fibers, wherein the super-hydrophobic concrete comprises the following raw materials in parts by weight: 1000 parts of cement, 800 parts of sand, 20 parts of water-based hydrophobic admixture and 30 parts of special composite fiber.
Further, the cement is P.O42.5 ordinary portland cement; the sand is fine sand screened by a 60-mesh fine screen; the special composite fiber consists of micron-sized calcium sulfate whiskers and alkali-resistant glass fibers, wherein the mass ratio of the calcium sulfate whiskers to the alkali-resistant glass fibers is 3: 1; the water-based hydrophobic admixture is organosilicon hydrophobic modified water-based polyurethane.
Example 3: the super-hydrophobic concrete is composed of cement, sand, a water-based hydrophobic admixture and special composite fibers, wherein the super-hydrophobic concrete comprises the following raw materials in parts by weight: 1000 parts of cement, 1200 parts of sand, 10 parts of a water-based hydrophobic admixture and 60 parts of special composite fiber.
Further, the cement is P.O42.5 ordinary portland cement; the sand is fine sand screened by a 60-mesh fine screen; the special composite fiber consists of micron-sized calcium sulfate whiskers and alkali-resistant glass fibers, wherein the mass ratio of the calcium sulfate whiskers to the alkali-resistant glass fibers is 1: 1; the water-based hydrophobic admixture is organosilicon hydrophobic modified water-based polyurethane.
Example 4: the super-hydrophobic concrete is composed of cement, sand, a water-based hydrophobic admixture and special composite fibers, wherein the super-hydrophobic concrete comprises the following raw materials in parts by weight: 1000 parts of cement, 900 parts of sand, 18 parts of water-based hydrophobic admixture and 40 parts of special composite fiber.
Further, the cement is P.O42.5 ordinary portland cement; the sand is fine sand screened by a 60-mesh fine screen; the special composite fiber consists of micron-sized calcium sulfate whiskers and alkali-resistant glass fibers, wherein the mass ratio of the calcium sulfate whiskers to the alkali-resistant glass fibers is 3: 2; the water-based hydrophobic admixture is organosilicon hydrophobic modified water-based polyurethane.
A use method of super-hydrophobic concrete comprises the following steps:
(1) preparing the raw materials according to the weight part ratio of the embodiment 1-4;
(2) fully and uniformly mixing ordinary portland cement, fine sand and special composite fibers, adding water, and fully and uniformly stirring to obtain concrete slurry;
(3) adding a water-based hydrophobic admixture into the concrete slurry and fully and uniformly mixing to obtain hydrophobic concrete slurry;
(4) and pouring, hardening and forming the obtained hydrophobic concrete slurry to obtain the super-hydrophobic concrete structure.
Comparative example 1: the super-hydrophobic concrete is composed of cement, sand, a water-based hydrophobic admixture and special composite fibers, wherein the super-hydrophobic concrete comprises the following raw materials in parts by weight: 1000 parts of cement, 1000 parts of sand and 45 parts of special composite fiber.
Further, the cement is P.O42.5 ordinary portland cement; the sand is fine sand screened by a 60-mesh fine screen; the special composite fiber consists of micron-sized calcium sulfate whiskers and alkali-resistant glass fibers, wherein the mass ratio of the calcium sulfate whiskers to the alkali-resistant glass fibers is 2: 1.
The use method of the super-hydrophobic concrete comprises the following steps:
(1) preparing the raw materials according to the weight part ratio of the comparative example 1;
(2) fully and uniformly mixing ordinary portland cement, fine sand and special composite fibers, adding water, and fully and uniformly stirring to obtain concrete slurry;
(3) and pouring, hardening and forming the obtained concrete slurry to obtain the super-hydrophobic concrete structure.
Comparative example 2: the super-hydrophobic concrete is composed of cement, sand, a water-based hydrophobic admixture and special composite fibers, wherein the super-hydrophobic concrete comprises the following raw materials in parts by weight: 1000 parts of cement, 1000 parts of sand and 15 parts of water-based hydrophobic admixture.
Further, the cement is P.O42.5 ordinary portland cement; the sand is fine sand screened by a 60-mesh fine screen; the water-based hydrophobic admixture is organosilicon hydrophobic modified water-based polyurethane.
The use method of the super-hydrophobic concrete comprises the following steps:
(1) preparing the raw materials according to the weight part ratio of the comparative example 2;
(2) fully and uniformly mixing ordinary portland cement and fine sand, adding water, and fully and uniformly stirring to obtain concrete slurry;
(3) adding a water-based hydrophobic admixture into the concrete slurry and fully and uniformly mixing to obtain hydrophobic concrete slurry;
(4) and pouring, hardening and forming the obtained hydrophobic concrete slurry to obtain the super-hydrophobic concrete structure.
The concrete blocks of examples 1 to 4 and comparative examples 1 to 2, which were made 60mm in diameter and 7mm in thickness, were tested, and the test contents included: the contact angle measuring instrument is utilized to test the contact of the hydrophobic coating, a microsyringe is adopted to measure about 5 mu L of deionized water each time and the deionized water is dripped on the surface of a sample to be measured, and the average value of 5 parallel measurements is taken; the abrasion resistance test was carried out by using an abrasion test of sandpaper (standard sandpaper No. 1500), and the test method was: attaching the surface of a sample to be tested to sand paper, placing a 50g weight on the sample, and keeping the weight at 4-5 mm.s-1The sample was dragged at a constant speed of 20cm as a wear cycle to record, and the change in water contact angle after the wear operation was measured using a contact angle measuring instrument, the results are shown in the following table.
The concrete blocks of examples 1 to 4 and comparative examples 1 to 2 were made into test pieces of 15mm × 15mm × 45mm in a cube, 3 test pieces of the same specification were made for each set, and the compressive strength was measured by a pressure gauge after 3 days and 7 days of natural curing, respectively.
The foregoing embodiments further illustrate the principles, main features and advantages of the present invention, and it will be understood by those skilled in the art that the foregoing embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the scope of the invention.
Claims (7)
1. A super-hydrophobic concrete is characterized in that: the super-hydrophobic concrete is composed of cement, sand, a water-based hydrophobic admixture and special composite fibers, wherein the super-hydrophobic concrete comprises the following raw materials in parts by weight: 1000 parts of cement, 800 parts of sand, 1200 parts of water-based hydrophobic admixture and 30-60 parts of special composite fiber.
2. The super-hydrophobic concrete as claimed in claim 1, wherein: the cement is P.O42.5 ordinary portland cement.
3. The super-hydrophobic concrete as claimed in claim 1, wherein: the sand is fine sand screened by a 60-mesh fine screen.
4. The super-hydrophobic concrete as claimed in claim 1, wherein: the water-based hydrophobic admixture is organosilicon hydrophobic modified water-based polyurethane.
5. The super-hydrophobic concrete as claimed in claim 4, wherein: the preparation method of the organosilicon hydrophobic modified waterborne polyurethane comprises the following steps: putting hydroxyl polydimethylsiloxane, polytetramethylene ether glycol and dimethyl pentamethylene diamine into a reaction container, stirring at a certain temperature, adding isophorone diisocyanate and an organic bismuth catalyst DY-20, reacting at a controlled temperature for a certain time, adding isophorone diisocyanate and 1, 4-dihydroxy butane to react to obtain an aqueous polyurethane-silicon prepolymer, sequentially adding acetone and triethylamine to continue reacting, adding deionized water under high-speed stirring to emulsify, adding ethylenediamine sodium ethanesulfonate and ethylenediamine to obtain a hydrophobic silicon-aqueous polyurethane emulsion, and finally adding KH550 to react to obtain the organosilicon hydrophobic modified aqueous polyurethane.
6. The super-hydrophobic concrete as claimed in claim 1, wherein: the special composite fiber consists of micron-sized calcium sulfate whiskers and alkali-resistant glass fibers, wherein the mass ratio of the calcium sulfate whiskers to the alkali-resistant glass fibers is 1-3: 1.
7. The method of using the superhydrophobic concrete of any one of claims 1-6, comprising the steps of:
(1) preparing the following raw materials in parts by weight: 1000 parts of cement, 800 parts of sand and 1200 parts of water-based hydrophobic admixture, 10-20 parts of special composite fiber and 500 parts of water and 600 parts of water;
(2) fully and uniformly mixing ordinary portland cement, fine sand and special composite fibers, adding water, and fully and uniformly stirring to obtain concrete slurry;
(3) adding a water-based hydrophobic admixture into the concrete slurry and fully and uniformly mixing to obtain hydrophobic concrete slurry;
(4) and pouring, hardening and forming the obtained hydrophobic concrete slurry to obtain the super-hydrophobic concrete structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210212737.4A CN114477917A (en) | 2022-03-04 | 2022-03-04 | Super-hydrophobic concrete and use method thereof |
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| CN202210212737.4A CN114477917A (en) | 2022-03-04 | 2022-03-04 | Super-hydrophobic concrete and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115521118A (en) * | 2022-11-24 | 2022-12-27 | 广东潮泰建设有限公司 | Impact-resistant wear-resistant concrete for rapid road restoration and preparation process thereof |
| WO2024051078A1 (en) * | 2022-09-05 | 2024-03-14 | 山东大学 | Super-hydrophobic self-luminous concrete material for 3d printing and preparation method |
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| CN108341635A (en) * | 2018-02-11 | 2018-07-31 | 东南大学 | A kind of super-hydrophobic cement and its preparation method and application |
| CN109503097A (en) * | 2018-11-24 | 2019-03-22 | 北京金中洲建筑材料有限公司 | Outdoor use polymer water proof type cracking resistance environmental protection mortar and preparation method thereof |
| CN111978508A (en) * | 2020-08-28 | 2020-11-24 | 陕西科技大学 | Organic silicon composite modified waterborne polyurethane and preparation method thereof |
| CN112210061A (en) * | 2020-09-23 | 2021-01-12 | 长春工业大学 | Preparation method of organic silicon modified castor oil based waterborne polyurethane film |
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2022
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| US20150191868A1 (en) * | 2014-01-03 | 2015-07-09 | Korea Institute Of Science And Technology | Super-hydrophobic fiber having needle-shaped nano structure on its surface, method for fabricating the same and fiber product comprising the same |
| CN108341635A (en) * | 2018-02-11 | 2018-07-31 | 东南大学 | A kind of super-hydrophobic cement and its preparation method and application |
| CN109503097A (en) * | 2018-11-24 | 2019-03-22 | 北京金中洲建筑材料有限公司 | Outdoor use polymer water proof type cracking resistance environmental protection mortar and preparation method thereof |
| CN111978508A (en) * | 2020-08-28 | 2020-11-24 | 陕西科技大学 | Organic silicon composite modified waterborne polyurethane and preparation method thereof |
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Cited By (2)
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| WO2024051078A1 (en) * | 2022-09-05 | 2024-03-14 | 山东大学 | Super-hydrophobic self-luminous concrete material for 3d printing and preparation method |
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