AU2021101939A4 - A concrete durability surface protection intervention material and a preparation method thereof - Google Patents
A concrete durability surface protection intervention material and a preparation method thereof Download PDFInfo
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- AU2021101939A4 AU2021101939A4 AU2021101939A AU2021101939A AU2021101939A4 AU 2021101939 A4 AU2021101939 A4 AU 2021101939A4 AU 2021101939 A AU2021101939 A AU 2021101939A AU 2021101939 A AU2021101939 A AU 2021101939A AU 2021101939 A4 AU2021101939 A4 AU 2021101939A4
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- 239000000463 material Substances 0.000 title claims abstract description 86
- 239000004567 concrete Substances 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 48
- 239000011248 coating agent Substances 0.000 claims abstract description 45
- 239000002131 composite material Substances 0.000 claims abstract description 33
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 29
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 16
- 239000002344 surface layer Substances 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 22
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 20
- 239000007864 aqueous solution Substances 0.000 claims description 20
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 20
- 239000004568 cement Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000011398 Portland cement Substances 0.000 claims description 8
- 239000006004 Quartz sand Substances 0.000 claims description 8
- XYRAEZLPSATLHH-UHFFFAOYSA-N trisodium methoxy(trioxido)silane Chemical compound [Na+].[Na+].[Na+].CO[Si]([O-])([O-])[O-] XYRAEZLPSATLHH-UHFFFAOYSA-N 0.000 claims description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 239000013543 active substance Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- 238000003760 magnetic stirring Methods 0.000 claims description 3
- 239000002086 nanomaterial Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 7
- 239000004566 building material Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 31
- 238000010521 absorption reaction Methods 0.000 description 11
- 239000002585 base Substances 0.000 description 6
- 230000035699 permeability Effects 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- HSFQBFMEWSTNOW-UHFFFAOYSA-N sodium;carbanide Chemical group [CH3-].[Na+] HSFQBFMEWSTNOW-UHFFFAOYSA-N 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001804 chlorine Chemical class 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010227 cup method (microbiological evaluation) Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/06—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement
- C09D1/08—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement with organic additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Wood Science & Technology (AREA)
- Structural Engineering (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
Abstract
The present invention discloses a concrete durability surface protection intervention material
and a preparation method thereof, the invention belongs to the technical field of building
materials. The concrete surface protection intervention material provided by the invention
comprises a bonding material and a hydrophobic breathable surface layer, wherein the bonding
material is composed of an inorganic-organic composite permeable material, and the
hydrophobic breathable surface layer is composed of a nano-modified waterborne fluorocarbon
coating, and the nano-modified waterborne fluorocarbon coating is coated on the surface of the
inorganic-organic composite permeable material to obtain the concrete surface protection
intervention material. The appearance quality of the concrete treated by the surface intervention
protection material process can be preserved for a long time, the durability of the concrete
structure is greatly improved, the material is very suitable for the protection of concrete in
alpine regions.
Description
A concrete durability surface protection intervention material and a preparation
method thereof
The present invention belongs to the technical field of building materials, in particular
refers to a concrete durability surface protection intervention material and a preparation
method thereof.
Concrete is a non-uniform porous material, which is easily degraded by natural
environment, thus affecting its durability. There are many factors that affect the durability
of concrete, such as fresh water corrosion, chemical erosion, freeze-thaw cycle, alkali
aggregate reaction and corrosion of steel bars in concrete. Usually, the concrete structure
in service is corroded by various harmful substances, which makes the steel bar corroded
or the concrete surface cracked and peeled off, thus seriously affecting the durability of
the reinforced concrete structure.
In the seasonal frozen soil distribution area, the winter snow covers for a long time, and
the temperature difference between day and night is large. At the same time, the soil
quality in the area is usually characterized by dispersion, hydrophilicity and expansibility.
This kind of soil is dry, hard and brittle after losing water, but slippery, soft and plastic
after meeting water, with heavy stickiness and poor permeability. In the service process
of concrete structures, the heavy use of deicing salt due to snowfall will greatly increase
the concentration of chlorine salt in the environment, which will make concrete freeze
and produce higher osmotic pressure and supercooled water, thus aggravating the damage
of freeze-thaw cycle to concrete and causing serious denudation of concrete surface. The use of chloride deicing agent will also cause a large amount of chloride ions to penetrate into the bridge concrete structure, which will cause serious corrosion to the steel bars in the concrete. At the same time, the construction in windy and arid environment will easily cause concrete to lose water quickly and cause shrinkage cracks, and it is easy to cause concrete cracking under the condition of large temperature difference between day and night. Based on the above complex engineering service environment, the requirements for durability of concrete is beyond the conventional technical requirements.
In order to ensure the quality of construction projects, and meet the requirements of
engineering construction, build a high-quality concrete project of Songyuan-Tongyu
Expressway with good appearance and solid quality, and meet the requirements of high
quality concrete, it is imperative to develop a new type of concrete protection material in
alpine regions.
The purpose of the invention is to provide a concrete durability surface protection
intervention material and a preparation method thereof, so as to solve the problems
existing in the prior art and realize the protection of concrete in alpine regions and saline
alkali regions.
To achieve the above purpose, the present invention provides the following scheme:
The invention provides a concrete surface protection intervention material, which
comprises a bonding material and a hydrophobic breathable surface layer. The bonding
material is composed of inorganic-organic composite permeable materials, and the hydrophobic breathable surface layer is composed of nano-modified waterborne fluorocarbon coating.
-18 parts of film-forming substances, 8-10 parts of active substances and 50-60 parts of
skeleton substances.
The film-forming substances comprise organic film-forming substances and inorganic
film-forming substances, and the mass ratio of the organic film-forming substances to the
inorganic film-forming substances is 1:2.
The active substance is one of sodium carbonate, sodium sulfate or sodium methyl
silicate.
Furthermore, the organic film-forming substance is polyvinyl alcohol. The inorganic
film-forming substance is a mixture of ordinary portland cement and white cement
according to the mass ratio of 3:1.
Furthermore, the skeleton material is quartz sand.
Furthermore, the nano-modified material of the nano-modified waterbome fluorocarbon
coating is nano TiO2, nanoSiO2or nano A1203.
Furthermore, the preparation method of the inorganic-organic composite permeable
material comprises the following steps:
(1) polyvinyl alcohol and deionized water are stirred at high speed to obtain polyvinyl
alcohol aqueous solution.
(2) stirring the polyvinyl alcohol aqueous solution and sodium methyl silicate at high
speed to obtain active aqueous solution.
(3) mixing the inorganic film-forming material with the active aqueous solution, adding
quartz sand, and stirring at high speed to prepare the inorganic-organic composite
permeable material.
Furthermore, the preparation method of the nano-modified waterbome fluorocarbon
coating comprises the following steps:
(1) obtaining the nano slurry by magnetic stirring nano materials and deionized water.
(2) carrying out high speed dispersion on the nano slurry and the waterbome fluorocarbon
to obtain the nano-modified waterborne fluorocarbon coating.
The invention also provides a preparation method of the concrete surface protection
intervention material, which comprises the following steps: coating the nano-modified
waterborne fluorocarbon coating on the surface of the inorganic-organic composite
permeable material to obtain the concrete surface protection intervention material.
The invention discloses the following technical effects:
According to the invention, cement and polyvinyl alcohol are used asfilm-forming
substances, and sodium methyl silicate is used as active chemical substance, so that the
inorganic-organic composite permeable bonding material has strong bonding strength and
impermeability, and micro cracks in concrete can be effectively reduced, thereby
improving the durability of concrete.
According to the invention, the nano-modified waterborne fluorocarbon coating is used
as the surface layer, so that a good hydrophobic breathable effect can be achieved, and
from the cost aspect, when using nano SiO2 modified waterborne fluorocarbon coating as
the surface layer, the economic benefit is the highest.
The appearance quality of the concrete treated by the surface intervention protection
material process can be kept effective for a long time, and the durability of the concrete
structure is greatly improved at the same time.
In order to explain the embodiments of the present invention or the technical scheme in
the prior art more clearly, the figures needed in the embodiments will be briefly
introduced below. Obviously, the figures in the following description are only some
embodiments of the present invention, and for ordinary technicians in the field, other
figures can be obtained according to these figures without paying creative labor.
Fig. 1 is a process flow chart for preparing the inorganic-organic composite permeable
bonding material of the present invention.
Fig. 2 is a process flow chart for preparing the hydrophobic breathable surface layer of
nano-modified coating of the present invention.
Fig. 3 is a bonding strength diagram of the inorganic-organic composite permeable
bonding material of the present invention.
Fig. 4 is a diagram of water vapor permeability of different nano-modified waterborne
fluorocarbons according to the present invention.
Various exemplary embodiments of the present invention will be described in detail
below, which should not be regarded as a limitation of the present invention, but rather as
a more detailed description of certain aspects, characteristics and embodiments of the
present invention.
Unless otherwise specified, "parts" mentioned in the present invention are calculated by
mass parts.
Fig. 1 is a process flow chart for preparing the inorganic-organic composite permeable
bonding material of the present invention.
Fig. 2 is a process flow chart for preparing the hydrophobic breathable surface layer of
nano-modified coating of the present invention.
Embodiment 1
A, preparing inorganic-organic composite permeable bonding material.
The raw materials of the inorganic-organic composite permeable bonding material
comprise the following components in parts by mass:
parts of film-forming substance, 8 parts of sodium methyl silicate and 50 parts of
quartz sand.
The film-forming substances comprise organic film-forming substances and inorganic
film-forming substances, and the mass ratio of the organic film-forming substances to the
inorganic film-forming substances is 1:2.
Among them, the organic film-forming substance is polyvinyl alcohol, and the inorganic
film-forming substance is a mixture of ordinary portland cement and white cement
according to the mass ratio of 3:1.
Preparation method:
(1) polyvinyl alcohol and deionized water are stirred at high speed to obtain polyvinyl
alcohol aqueous solution.
(2) stirring the polyvinyl alcohol aqueous solution and sodium methyl silicate at high
speed to obtain active aqueous solution.
(3) mixing inorganic film-forming material (mixture of ordinary portland cement and
white cement according to the mass ratio of 3:1) with active aqueous solution, adding
quartz sand, and stirring at high speed to prepare inorganic-organic composite permeable
bonding material.
B, preparing hydrophobic breathable material.
(1) obtaining the nano slurry by magnetic stirring nano TiO2and deionized water.
(2) carrying out high speed dispersion on the nano slurry and the waterbome fluorocarbon
to obtain the hydrophobic breathable material.
C, preparing concrete surface protection intervention material.
Coating the nano-modified waterborne fluorocarbon coating on the surface of the
inorganic-organic composite permeable material to obtain the concrete surface protection
intervention material.
Embodiment 2
A, preparing inorganic-organic composite permeable bonding material.
The raw materials of the inorganic-organic composite permeable bonding material
comprise the following components in parts by mass:
16 parts of film-forming substances, 9 parts of sodium carbonate and 55 parts of quartz
sand.
The film-forming substances comprise organic film-forming substances and inorganic
film-forming substances, and the mass ratio of the organic film-forming substances to the
inorganic film-forming substances is 1:2.
Among them, the organic film-forming substance is polyvinyl alcohol, and the inorganic
film-forming substance is a mixture of ordinary portland cement and white cement
according to the mass ratio of 3:1.
Preparation method:
(1) polyvinyl alcohol and deionized water are stirred at high speed to obtain polyvinyl
alcohol aqueous solution.
(2) stirring polyvinyl alcohol aqueous solution and sodium carbonate at high speed to
obtain active aqueous solution.
(3) mixing inorganic film-forming material (mixture of ordinary portland cement and
white cement according to the mass ratio of 3:1) with active aqueous solution, adding
quartz sand, and stirring at high speed to prepare inorganic-organic composite permeable
bonding material.
B, preparing hydrophobic breathable materials
(1) magnetically stirring nano SiO2 and deionized water to obtain nano slurry.
(2) carrying out high speed dispersion on the nano slurry and the waterborne fluorocarbon
to obtain the hydrophobic breathable material.
C, preparing concrete surface protection intervention material
Coating the nano-modified waterborne fluorocarbon coating on the surface of the
inorganic-organic composite permeable material to obtain the concrete surface protection
intervention material.
Embodiment 3
A, preparing inorganic-organic composite permeable bonding material.
The raw materials of the inorganic-organic composite permeable bonding material
comprise the following components in parts by mass:
18 parts of film-forming substances, 10 parts of sodium sulfate and 60 parts of quartz
sand.
The film-forming substances comprise organic film-forming substances and inorganic
film-forming substances, and the mass ratio of the organic film-forming substances to the
inorganic film-forming substances is 1:2.
Among them, the organic film-forming substance is polyvinyl alcohol, and the inorganic
film-forming substance is a mixture of ordinary portland cement and white cement
according to the mass ratio of 3:1.
Preparation method:
(1) polyvinyl alcohol and deionized water are stirred at high speed to obtain polyvinyl
alcohol aqueous solution.
(2) stirring polyvinyl alcohol aqueous solution and sodium sulfate at high speed to obtain
active aqueous solution.
(3) mixing inorganic film-forming material (mixture of ordinary portland cement and
white cement according to the mass ratio of 3:1) with active aqueous solution, adding
quartz sand, and stirring at high speed to prepare inorganic-organic composite permeable
bonding material.
B, preparing hydrophobic breathable materials.
(1) magnetically stirring nano A1203 and deionized water to obtain nano slurry.
(2) carrying out high speed dispersion on the nano slurry and the waterborne fluorocarbon
to obtain the hydrophobic breathable material.
C, preparing concrete surface protection intervention material.
Coating the nano-modified waterborne fluorocarbon coating on the surface of the
inorganic-organic composite permeable material to obtain the concrete surface protection
intervention material.
I. Performance verification of inorganic-organic composite permeable bonding material.
Through impermeability test and bond strength test, the performance of base coat
composed of different chemical active substances is verified, and the test scheme is
shown in Table 1.
Table 1
Groups Processing mode
0# Blank group, establish blank contrast specimens according to the on-site C40 concrete mixture ratio
1# Coating an inorganic-organic composite permeable bonding material with black and white cement and polyvinyl alcohol as film forming substances and sodium carbonate as active chemical substances 2# Coating an inorganic-organic composite permeable bonding material with black and white cement and polyvinyl alcohol as film forming substances and sodium sulfate as active chemical substances 3# Coating an inorganic-organic composite permeable bonding material with black-and white cement and polyvinyl alcohol as film forming substances and sodium methyl silicate as active chemical substances
(1) impermeability test
According to the Chinese national standard Cementitious Capillary Crystalline
Waterproofing Coatings (GB 18445-2012), 12 concrete specimens were formed, which
were divided into 4 groups after demoulding. Three groups were selected to be coated
with inorganic-organic composite permeable bonding base coat, and after curing to the
age of 14 days under standard conditions, the specimens were taken out, wiped clean and
dried. Seal the specimen with sealing material and put it into the concrete penetrameter
for impermeability test. The impermeability pressure value of concrete is measured by the
step-by-step pressurization method, and two impermeability tests are carried out for all
specimens. The water pressure of the impermeability test starts from O.1MPa, and then
increases by 0.1MPa every 8 hours. Observe and record the water seepage of the end face
of the specimen at any time. After the first impermeability test is finished, the specimen is
demoulded and sent to the standard room for continuous curing for 28 days, and then the
second impermeability test is carried out. The pressure test method is the same as the first
impermeability test. Table 2 shows the results of impermeability test.
Table 2
Group First impermeability pressure /MPa Second impermeability pressure /MPa
1 2 3 Average 1 2 3 Average 0# 0.4 0.5 0.4 0.43 0.2 0.2 0.2 0.2 1# 0.9 0.8 0.9 0.87 1.0 1.0 1.1 1.03 2# 0.7 0.7 0.6 0.67 0.8 0.8 0.7 0.77 3# 1.0 1.1 0.9 1.0 1.2 1.3 1.1 1.2
(2) Bond strength test
The test is carried out according to the national standard Cementitious Capillary
Crystalline Waterproofing Coatings (GB 18445-2012). After the demoulded specimen is cured by soaking in water under standard conditions (soaking in standard concrete slab, but not coating specimen) for 27 days, the floating slurry on the surface is polished off with sandpaper, and the corresponding joint is bonded to the molding surface of the specimen with high-strength adhesive, and the specimen is tested after standing for 24 hours under standard curing conditions. The tensile bond strength of specimens was measured by electronic universal testing machine. The average value is taken as the wet bond strength of the specimen. The test results of each group are shown in Fig 3.
It can be seen from the figure that the adhesive strength of wet joint surface of coatings
doped with active chemical substances is greater than the requirement of 1.OMPa in the
standard, and the adhesive strength of base coat coating doped with sodium methyl
silicate is the best, which indicates that the adhesive force between inorganic-organic
composite permeable bonding material doped with sodium methyl silicate and cement
based material base surface is better.
II, hydrophobic breathable surface performance test
See table 3 for the experimental scheme.
Table 3
Group Processing mode
0# Blank group, establish blank contrast specimens according to the on-site C40 concrete mixture ratio 1# Coating nano-TiO2modified waterbome fluorocarbon coating 2# Coating nano-SiO2modified waterborne fluorocarbon coating 3# Coating nano-A1203modified waterborne fluorocarbon coating
(1) contact angle test
Four concrete specimens were formed according to the C40 pier mix ratio used in the
field. After curing for 28 days under the standard condition, they were coated with nano
TiO2 modified waterborne fluorocarbon coating, nano-SiO2 modified waterborne
fluorocarbon coating and nano-A1203 modified waterbome fluorocarbon coating. After
the surface of the specimens was dry, the contact angle was tested, and each specimen
was tested for 10 times. The test results are shown in Table 4.
Table 4
Group Contact Angle
1 2 3 4 5 Average 0# 82 85 87 81 88 84.6 1# 124 124 118 117 115 119.6 2# 113 118 115 121 116 116.6 3# 126 117 121 112 125 120.2
(2) air permeability test
The air permeability test of the coating shall be carried out according to the Test method
for water vapor transmissionofplasticfilms and sheets - Cup method (GB1037-88). The
permeability of the surface layer is characterized by a certain water vapor pressure
difference and the amount of water vapor transmitted by the unit area sample within 24h
under the specified temperature and relative humidity. See Fig. 4 for the results of water
vapor transmission. It can be seen from the figure that the water vapor transmission per
square meter of concrete coated with nano-modified coating is obviously better than that of concrete block without coating, which indicates that the nano-modified waterborne fluorocarbon surface layer has good air permeability.
III. Performance test of multifunctional concrete protective materials
(1) physical and mechanical properties test
According to the Methods of testing cements - Determination ofstrength (GB/T 17671
1999), three groups of specimens were formed respectively, and after curing for 28 days
under standard conditions, compressive and flexural tests were carried out. The test
results are shown in Table 5.
Table 5
Group Rupture strength Compressive strength Benchmark group 9.27 41.97 Painting group 9.52 42.23
(2) durability test
The test was carried out in accordance with the Standardfortest methods of long-term
performance and durability of ordinary concrete (GB/T 50082-2009). The freezing
resistance was selected by the "quick frost method", and the chloride ion penetration test
was selected by the RCM method. The test mix ratio and scheme are shown in Table 6,
and the results are shown in Table 7.
Table 6
Number Cement Flyash Silica River Coarse Protective Slump Gas fume sand aggregate material mm content Initial %
/1h 1 315 63 42 775 1070 Blank 230/210 4.5 2 Base coating 230/210 4.4 3 Surface coating 230/210 4.5 4 Base 230/210 4.6 coating+Surface coating
Table 7
Number Chloride ion diffusion Frost resistance coefficient (10-12m 2/s) 28d 56d Initial/Termination Cycle times of Frost dynamic elastic 60% dynamic resistance modulus (GPa) elastic index modulus 1 3.7 2.8 56.31/34.35 425 0.86 2 3.2 2.5 61.24/36.14 475 0.93 3 2.7 2.1 60.25/46.75 >500 >1.20 4 2.4 1.9 57.17/43.73 >500 >1.27
(3) water absorption test
The specific test method of water absorption rate is:
(1) taking out the coated surface intervention modification materials and unpainted
specimens after curing to the specified age, put them into an oven at 75-80°C for drying
(48±5)h, and then put them to room temperature for weighing.
(2) placing the specimens horizontally in a plastic box, adding water to immerse one third
of the specimen in water, marking the water surface height with a line, testing the water absorption of the specimen after 1h, 2h, 4h, 8h, 12h, 24h and 48h, drying the surface water before weighing, putting it back into the water tank after weighing, and putting the cover back. During the test, replenish the water in the tank at any time to ensure that the liquid level is on the mark scale.
(3) The calculation method of water absorption rate is as shown in Formula (2)
Mg -MO W- = M XlO10 (2)
In the formula, WR is the water absorption rate of the specimen (%).
Mg is the mass of the specimen after absorbing water (g).
Mo is the constant weight of the specimen at room temperature (g).
The test results are shown in Table 8.
Table 8
Type of Quality after Mass after Mass Water Average water specimen drying water difference absorption absorption absorption Benchmark 43.5 47.2 3.7 8.51% 8.32% group 45.3 49.0 3.7 8.17% (not coated) 45.8 49.6 3.8 8.30% Comparative 44.5 45.5 1 2.25% 2.49% group 46.8 48.0 1.2 2.56% (coated) 45.1 46.3 1.2 2.66%
It can be seen from Table 8 that the water absorption rate of concrete coated with surface
intervention modification materials is much lower than that of ordinary concrete, and
after soaking for the same time, its water absorption rate is only 30% of that of ordinary
concrete, which indicates that surface intervention modification materials can effectively
reduce the water absorption rate of concrete, prevent water from invading concrete under rainfall and snowfall environment, and avoid concrete corrosion and freeze-thaw damage at low temperature.
The above embodiments only describe the preferred mode of the invention, but do not
limit the scope of the invention. On the premise of not departing from the design spirit of
the invention, various modifications and improvements made by ordinary technicians in
the field to the technical scheme of the invention shall fall within the protection scope
determined by the claims of the invention.
Claims (7)
1. A concrete surface protection intervention material, which is characterized by
comprising: a bonding material and a hydrophobic breathable surface layer. The bonding
material is composed of inorganic-organic composite permeable materials, and the
hydrophobic breathable surface layer is composed of nano-modified waterborne
fluorocarbon coating.
The inorganic-organic composite permeable material comprises the following raw
materials in parts by weight:
-18 parts of film-forming substances, 8-10 parts of active substances and 50-60 parts of
skeleton substances.
The film-forming substances comprise organic film-forming substances and inorganic
film-forming substances, and the mass ratio of the organic film-forming substances to the
inorganic film-forming substances is 1:2.
The active substance is one of sodium carbonate, sodium sulfate or sodium methyl
silicate.
2. The concrete surface protection intervention material according to claim 1,
characterized in that the organic film-forming substance is polyvinyl alcohol. The
inorganic film-forming substance is a mixture of ordinary portland cement and white
cement according to the mass ratio of 3:1.
3. The concrete surface protection intervention material according to claim 1,
characterized in that the skeleton material is quartz sand.
4. The concrete surface protection intervention material according to claim 1,
characterized in that the nano-modified material of the nano-modified waterbome
fluorocarbon coating is nano TiO2, nano SiO2 or nano A1203.
5. The concrete surface protection intervention material according to claim 2,
characterized in that the preparation method of the inorganic-organic composite
permeable material comprises the following steps:
(1) polyvinyl alcohol and deionized water are stirred at high speed to obtain polyvinyl
alcohol aqueous solution.
(2) stirring the polyvinyl alcohol aqueous solution and sodium methyl silicate at high
speed to obtain active aqueous solution.
(3) mixing the inorganic film-forming material with the active aqueous solution, adding
quartz sand, and stirring at high speed to prepare the inorganic-organic composite
permeable material.
6. The concrete surface protection intervention material according to claim 1,
characterized in that the preparation method of the nano-modified waterborne
fluorocarbon coating comprises the following steps:
(1) obtaining the nano slurry by magnetic stirring nano materials and deionized water.
(2) carrying out high speed dispersion on the nano slurry and the waterbome fluorocarbon
to obtain the nano-modified waterborne fluorocarbon coating.
7. The preparation method of the concrete surface protection intervention material
according to any one of claims 1-6, characterized by comprises following steps: coating
the nano-modified waterborne fluorocarbon coating on the surface of the inorganic- organic composite permeable material to obtain the concrete surface protection interventionmaterial.
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| CN117105610A (en) * | 2023-10-23 | 2023-11-24 | 中北大学德州产业技术研究院 | Baking-free brick of coal slime and household garbage incineration fly ash and preparation process thereof |
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| CN117105610A (en) * | 2023-10-23 | 2023-11-24 | 中北大学德州产业技术研究院 | Baking-free brick of coal slime and household garbage incineration fly ash and preparation process thereof |
| CN117105610B (en) * | 2023-10-23 | 2023-12-19 | 中北大学德州产业技术研究院 | Baking-free brick of coal slime and household garbage incineration fly ash and preparation process thereof |
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