CN111825392A - Microbial erosion resistant protective concrete and preparation method thereof - Google Patents
Microbial erosion resistant protective concrete and preparation method thereof Download PDFInfo
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- CN111825392A CN111825392A CN202010661933.0A CN202010661933A CN111825392A CN 111825392 A CN111825392 A CN 111825392A CN 202010661933 A CN202010661933 A CN 202010661933A CN 111825392 A CN111825392 A CN 111825392A
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
-
- 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
- C04B2111/2092—Resistance against biological degradation
Abstract
The invention discloses a microorganism erosion resistant protective concrete which comprises the following components in parts by weight: 300 parts of cement 260-broken materials, 80-120 parts of fly ash, 20-30 parts of silica fume, 40-60 parts of mineral powder, 930-broken stone 960 parts, 750 parts of yellow sand 720-broken materials, 8-12 parts of hydrated oxides, 8-12 parts of additives, 40-64 parts of nano silicon dioxide, 2-4 parts of hydrophobic compound pore plugs and 150 parts of water 130-broken materials. The concrete prepared by the invention has excellent mechanical property and volume stability, can effectively resist microbial corrosion for a long time under the condition of not adding an antibacterial component, and is particularly suitable for urban drainage pipelines, sewage treatment systems and other systems.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to microbial erosion resistant protective concrete and a preparation method thereof.
Background
Urban drainage pipelines and sewage treatment systems are important infrastructures, blood vessels and the like of cities, and play an important role in urban construction, production development, improvement of living standard of people, improvement of urban ecological environment and the like. In urban environmental engineering, structures for conveying and treating sewage, such as a sewage discharge pipe, a primary sedimentation tank, an aeration tank, an oxidation ditch, a secondary sedimentation tank and the like, are all of reinforced concrete structures. The treatment storage tanks are buried, semi-buried, closed, semi-closed or open-air, and are subjected to various corrosion effects of acid, alkali, atmosphere, microorganisms and the like for a long time.
The microbial corrosion of concrete causes the surface of a concrete pipe to be stained, mortar to be stripped, the structure is loose, steel bars are exposed to rust, and even crack when the steel bars are serious, so that sewage is leaked out, the service life of the concrete pipe is greatly shortened, the relevant functions of a city are directly influenced, and huge economic and environmental costs are generated when the concrete pipe is rebuilt or maintained.
CN109650790A discloses a high-strength antibacterial concrete and a preparation method thereof, wherein the growth of fungi is inhibited by adding laurel leaf powder. CN104016620A discloses an antibacterial concrete and a preparation method thereof, and the concrete can resist aging, static electricity, bacteria and the like by adding tetrapod-like zinc oxide whiskers with various characteristics. CN103964760B discloses a sea-buckthorn waste residue antibacterial concrete and a preparation method thereof, and CN104230228B discloses a high-temperature resistant antibacterial concrete and a preparation method thereof. Although the antibacterial performance of the concrete is improved quickly and conveniently by adding the antibacterial component, the antibacterial material has poor general compatibility with the concrete, and the service life of the antibacterial material is inconsistent with that of a concrete structure.
Disclosure of Invention
The invention aims to provide microbial erosion resistant protective concrete and a preparation method thereof, wherein the concrete has excellent mechanical properties and volume stability, can effectively resist microbial erosion for a long time under the condition that no antibacterial component is added, and is particularly suitable for urban drainage pipelines, sewage treatment systems and other systems.
In order to achieve the purpose, the technical scheme is as follows:
the microbial erosion resistant protective concrete comprises the following components in parts by weight:
300 parts of cement 260-broken materials, 80-120 parts of fly ash, 20-30 parts of silica fume, 40-60 parts of mineral powder, 930-broken stone 960 parts, 750 parts of yellow sand 720-broken materials, 8-12 parts of hydrated oxides, 8-12 parts of additives, 40-64 parts of nano silicon dioxide, 2-4 parts of hydrophobic compound pore plugs and 150 parts of water 130-broken materials.
According to the scheme, the cement is P.O 42.5 ordinary portland cement.
According to the scheme, the fly ash is I-grade fly ash, and the loss on ignition is less than or equal to 2%.
According to the scheme, SiO in the silica fume2The content is more than 95 wt%.
According to the scheme, the mineral powder is S95 mineral powder.
According to the scheme, the crushed stone is 5-16mm continuous graded crushed stone, the crushing value is less than or equal to 20%, the mud content is less than or equal to 2.0%, and the content of needle-shaped particles is less than or equal to 8 wt%.
According to the scheme, the yellow sand is the medium sand in the area II.
According to the scheme, the hydrated oxide is obtained by adding a silane coupling agent for heating reaction and centrifuging at normal temperature after inorganic nano oxide is uniformly dispersed in a toluene solution by ultrasonic.
According to the scheme, the nano silicon dioxide is white uniform powder, and the average particle size is 10-30 nm.
According to the scheme, the hydrophobic compound pore plug is powdery, and the water absorption (7d) is less than or equal to 1%.
According to the scheme, the additive is a high-performance polycarboxylic acid water reducing agent.
The preparation method of the microbial erosion resistant protective concrete comprises the following steps:
1) uniformly stirring and mixing cement, fly ash, silica fume and mineral powder to obtain a mixture;
2) sequentially adding the macadam, the yellow sand and the nano silicon dioxide into the mixture, adding water and the additive, and stirring for 1-2min to obtain premixed concrete;
3) adding hydrated oxide and hydrophobic compound pore plug substances into the premixed concrete, and stirring for 2-5min again;
4) and curing for 7d in a humid environment at the temperature of 5-25 ℃ after pouring, and then demolding.
Compared with the prior art, the invention has the following beneficial effects:
the size range of the nano-silica is 10-30 nm, and the ranges of gel gaps, capillary gaps and hydrated calcium silicate layer crystal gaps in the concrete are 1-100 nm, so that on one hand, the nano-silica can physically fill the gaps in the concrete to improve the compactness of the concrete, and on the other hand, the nano-silica can perform secondary hydration reaction with a cement hydrated product to generate hydrated calcium silicate gel with strong cementing power and a more compact structure, thereby optimizing a concrete structure, improving the mechanical properties of the concrete such as impact and abrasion resistance and the like, and improving the microbial erosion caused by the structural defects of the concrete.
Meanwhile, the nano silicon dioxide serves as a crystal nucleus in the hydration process, and induces the calcium hydroxide to grow to form calcium hydroxide crystals with complete crystal structures, so that the calcium hydroxide crystals have the minimum internal energy and low reaction activity, and the concrete can maintain higher alkalinity, and the microorganisms grow slowly in a high-alkalinity environment.
The hydrated oxide is an inorganic nano oxide treated by the silane coupling agent, because the hydrated oxide has lower surface free energy, the contact angle of concrete to water drops is increased, the cohesive force between water molecules is greater than the attraction force between the water molecules and material molecules, the surface of the concrete can not be wetted by water, and a corrosion channel of microorganisms to the concrete is cut off.
Detailed Description
The following examples further illustrate the technical solutions of the present invention, but should not be construed as limiting the scope of the present invention.
Example 1
The embodiment of the invention provides microbial erosion resistant protective concrete which comprises the following raw materials of 260 parts of cement, 120 parts of fly ash, 30 parts of silica fume, 60 parts of mineral powder, 960 parts of broken stone, 735 parts of yellow sand, 10 parts of hydrated oxide, 10 parts of additive, 40 parts of nano silicon dioxide, 3 parts of hydrophobic combined pore plug and 150 parts of water.
In a specific embodiment, the cement is Portland cement P.O 42.5.
In a specific embodiment, the fly ash is Huafeng I-grade fly ash, and the ignition loss is 1%.
In a specific embodiment, the silica fume is SiO2The content is 96%.
In a specific embodiment, the ore powder is Xinyuan S95 ore powder.
In a specific embodiment, the macadam is 5-16mm Youkun continuous graded macadam, the crushing value is 9.0%, the mud content is 1.2%, and the content of the needle-shaped flaky particles is 4%.
In a specific embodiment, the yellow sand is Yueyang area II medium sand.
In a specific embodiment, the hydrated oxide is obtained by adding a silane coupling agent for heating reaction after nano silicon dioxide is uniformly dispersed in a toluene solution by ultrasonic wave, and centrifuging at normal temperature.
In a specific embodiment, the nanosilica is a white uniform powder with an average particle size of 20 nm.
In a specific embodiment, the hydrophobically compounded pore plug is in powder form and has a water absorption (7d) of 0.2%.
The preparation method of the microorganism erosion resistant protective concrete comprises the following steps:
a. uniformly stirring and mixing cement, fly ash, silica fume and mineral powder to obtain a mixture;
b. b, sequentially adding broken stone, yellow sand and nano silicon dioxide into the mixture obtained in the step a, adding water and an additive, and stirring for 1min to obtain premixed concrete;
c. b, adding the hydrated oxide and the hydrophobic compound pore plug into the premixed concrete obtained in the step b, and stirring for 3min again;
d. and curing for 7d in a humid environment at the temperature of 5-25 ℃ after pouring, and then demolding.
Example 2
The embodiment of the invention provides microbial erosion resistant protective concrete which comprises the following raw materials of 300 parts of cement, 80 parts of fly ash, 20 parts of silica fume, 40 parts of mineral powder, 945 parts of broken stone, 750 parts of yellow sand, 8 parts of hydrated oxide, 8 parts of additive, 52 parts of nano silicon dioxide, 2 parts of hydrophobic combined pore plug and 140 parts of water.
In a specific embodiment, the cement is Portland cement P.O 42.5.
In a specific embodiment, the fly ash is Huafeng I-grade fly ash, and the ignition loss is 1%.
In a specific embodiment, the silica fume is SiO2The content is 96%.
In a specific embodiment, the ore powder is Xinyuan S95 ore powder.
In a specific embodiment, the macadam is 5-16mm Youkun continuous graded macadam, the crushing value is 9.0%, the mud content is 1.2%, and the content of the needle-shaped flaky particles is 4%.
In a specific embodiment, the yellow sand is Yueyang area II medium sand.
In a specific embodiment, the hydrated oxide is obtained by adding a silane coupling agent for heating reaction after nano silicon dioxide is uniformly dispersed in a toluene solution by ultrasonic wave, and centrifuging at normal temperature.
In a specific embodiment, the nanosilica is a white uniform powder with an average particle size of 20 nm.
In a specific embodiment, the hydrophobically compounded pore plug is in powder form and has a water absorption (7d) of 0.2%.
The preparation method of the microorganism erosion resistant protective concrete comprises the following steps:
a. uniformly stirring and mixing cement, fly ash, silica fume and mineral powder to obtain a mixture;
b. b, sequentially adding broken stone, yellow sand and nano silicon dioxide into the mixture obtained in the step a, adding water and an additive, and stirring for 1min to obtain premixed concrete;
c. b, adding the hydrated oxide and the hydrophobic compound pore plug into the premixed concrete obtained in the step b, and stirring for 2min again;
d. and curing for 7d in a humid environment at the temperature of 5-25 ℃ after pouring, and then demolding.
Example 3
The embodiment of the invention provides microbial erosion resistant protective concrete which comprises the following raw materials of 280 parts of cement, 100 parts of fly ash, 25 parts of silica fume, 50 parts of mineral powder, 9450 parts of broken stone, 720 parts of yellow sand, 12 parts of hydrated oxide, 12 parts of additive, 64 parts of nano silicon dioxide, 4 parts of hydrophobic combined pore plug and 140 parts of water.
In a specific embodiment, the cement is Portland cement P.O 42.5.
In a specific embodiment, the fly ash is Huafeng I-grade fly ash, and the ignition loss is 1%.
In a specific embodiment, the silica fume is SiO2The content is 96%.
In a specific embodiment, the ore powder is Xinyuan S95 ore powder.
In a specific embodiment, the macadam is 5-16mm Youkun continuous graded macadam, the crushing value is 9.0%, the mud content is 1.2%, and the content of the needle-shaped flaky particles is 4%.
In a specific embodiment, the yellow sand is Yueyang area II medium sand.
In a specific embodiment, the hydrated oxide is obtained by adding a silane coupling agent for heating reaction after nano silicon dioxide is uniformly dispersed in a toluene solution by ultrasonic wave, and centrifuging at normal temperature.
In a specific embodiment, the nanosilica is a white uniform powder with an average particle size of 20 nm.
In a specific embodiment, the hydrophobically compounded pore plug is in powder form and has a water absorption (7d) of 0.2%.
The preparation method of the microorganism erosion resistant protective concrete comprises the following steps:
a. uniformly stirring and mixing cement, fly ash, silica fume and mineral powder to obtain a mixture;
b. b, sequentially adding broken stone, yellow sand and nano silicon dioxide into the mixture obtained in the step a, adding water and an additive, and stirring for 3min to obtain premixed concrete;
c. b, adding the hydrated oxide and the hydrophobic compound pore plug into the premixed concrete obtained in the step b, and stirring for 5min again;
d. and curing for 7d in a humid environment at the temperature of 5-25 ℃ after pouring, and then demolding.
Example 4
The embodiment of the invention provides microbial erosion resistant protective concrete which comprises the following raw materials of 28 parts of cement, 100 parts of fly ash, 25 parts of silica fume, 50 parts of mineral powder, 930 parts of crushed stone, 735 parts of yellow sand, 12 parts of hydrated oxide, 12 parts of additive, 64 parts of nano silicon dioxide, 4 parts of hydrophobic combined pore plug and 130 parts of water.
In a specific embodiment, the cement is Portland cement P.O 42.5.
In a specific embodiment, the fly ash is Huafeng I-grade fly ash, and the ignition loss is 1%.
In a specific embodiment, the silica fume is SiO2The content is 96%.
In a specific embodiment, the ore powder is Xinyuan S95 ore powder.
In a specific embodiment, the macadam is 5-16mm Youkun continuous graded macadam, the crushing value is 9.0%, the mud content is 1.2%, and the content of the needle-shaped flaky particles is 4%.
In a specific embodiment, the yellow sand is Yueyang area II medium sand.
In a specific embodiment, the hydrated oxide is obtained by adding a silane coupling agent for heating reaction after nano silicon dioxide is uniformly dispersed in a toluene solution by ultrasonic wave, and centrifuging at normal temperature.
In a specific embodiment, the nanosilica is a white uniform powder with an average particle size of 20 nm.
In a specific embodiment, the hydrophobically compounded pore plug is in powder form and has a water absorption (7d) of 0.2%.
The preparation method of the microorganism erosion resistant protective concrete comprises the following steps:
a. uniformly stirring and mixing cement, fly ash, silica fume and mineral powder to obtain a mixture;
b. b, sequentially adding broken stone, yellow sand and nano silicon dioxide into the mixture obtained in the step a, adding water and an additive, and stirring for 2min to obtain premixed concrete;
c. b, adding the hydrated oxide and the hydrophobic compound pore plug into the premixed concrete obtained in the step b, and stirring for 5min again;
d. and curing for 7d in a humid environment at the temperature of 5-25 ℃ after pouring, and then demolding.
Comparative example 1
The comparative example provides a common concrete, which comprises the following raw materials of 300 parts of cement, 120 parts of fly ash, 20 parts of silica fume, 60 parts of mineral powder, 930 parts of broken stone, 750 parts of river sand, 12 parts of additive and 170 parts of water.
In a specific embodiment, the cement is Portland cement P.O 42.5.
In a specific embodiment, the fly ash is Huafeng I-grade fly ash, and the ignition loss is 1%.
In a specific embodiment, the silica fume is SiO2The content is 96%.
In a specific embodiment, the ore powder is Xinyuan S95 ore powder.
In a specific embodiment, the macadam is 5-16mm Youkun continuous graded macadam, the crushing value is 9.0%, the mud content is 1.2%, and the content of the needle-shaped flaky particles is 4%.
In a specific embodiment, the yellow sand is Yueyang area II medium sand.
The concrete is prepared into a cubic test piece with the thickness of 150mm to 150mm as a corrosion test piece, sewage with the COD of 8000mg/L is used as a corrosion medium, and a performance comparison table of the concrete after 120 days is shown in table 1.
TABLE 1
| Numbering | Concrete mass loss rate (%) | Compressive strength corrosion resistance coefficient | Surface pH | Porosity (%) |
| Example 1 | 0.34 | 0.91 | 10.6 | 18.26 |
| Example 2 | 0.25 | 0.92 | 11.0 | 17.41 |
| Example 3 | 0.21 | 0.94 | 11.2 | 16.25 |
| Example 4 | 0.27 | 0.91 | 11.1 | 17.16 |
| Comparative example 1 | 1.41 | 0.77 | 9.8 | 30.84 |
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. The microbial erosion resistant protective concrete is characterized by comprising the following components in parts by weight:
300 parts of cement 260-broken materials, 80-120 parts of fly ash, 20-30 parts of silica fume, 40-60 parts of mineral powder, 930-broken stone 960 parts, 750 parts of yellow sand 720-broken materials, 8-12 parts of hydrated oxides, 8-12 parts of additives, 40-64 parts of nano silicon dioxide, 2-4 parts of hydrophobic compound pore plugs and 150 parts of water 130-broken materials.
2. The concrete for protecting against microbial attack according to claim 1, wherein said cement is P-O42.5 portland cement.
3. The concrete for protecting against microbial erosion as claimed in claim 1, wherein said fly ash is class i fly ash, loss on ignition is less than or equal to 2%; SiO in the silica fume2The content is more than 95 wt%.
4. The microbial erosion resistant protective concrete according to claim 1, wherein the mineral powder is S95 mineral powder; the yellow sand is the medium sand in the area II.
5. The concrete for protecting against microbial erosion as claimed in claim 1, wherein said crushed stone is a 5-16mm continuous graded crushed stone having a crush value of 20% or less, a mud content of 2.0% or less, and a needle-like particle content of 8 wt% or less.
6. The concrete for resisting microbial erosion and protecting against microbial erosion as claimed in claim 1, wherein the hydrated oxide is obtained by adding silane coupling agent for heating reaction after inorganic nano oxide is dispersed uniformly in toluene solution by ultrasound, and centrifuging at normal temperature.
7. The concrete for protecting against microbial erosion as claimed in claim 1, wherein said nano silica is a white uniform powder having an average particle size of 10 to 30 nm.
8. The concrete for protecting against microbial erosion as claimed in claim 1, wherein said hydrophobic compound plugs are in powder form and have a water absorption (7d) of 1% or less.
9. The concrete for protecting against microbial erosion as claimed in claim 1, wherein said admixture is a high performance polycarboxylic acid water reducing agent.
10. A method of preparing a concrete for protection against microbial attack as claimed in any one of claims 1 to 9, comprising the steps of:
1) uniformly stirring and mixing cement, fly ash, silica fume and mineral powder to obtain a mixture;
2) sequentially adding the macadam, the yellow sand and the nano silicon dioxide into the mixture, adding water and the additive, and stirring for 1-2min to obtain premixed concrete;
3) adding hydrated oxide and hydrophobic compound pore plug substances into the premixed concrete, and stirring for 2-5min again;
4) and curing for 7d in a humid environment at the temperature of 5-25 ℃ after pouring, and then demolding.
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| CN113603427A (en) * | 2021-08-31 | 2021-11-05 | 成都精准混凝土有限公司 | Microbial erosion resistant protective concrete and preparation method thereof |
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