CN112551953A - Fly ash-based polymer mortar repair material and preparation method thereof - Google Patents
Fly ash-based polymer mortar repair material and preparation method thereof Download PDFInfo
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- CN112551953A CN112551953A CN202011409374.0A CN202011409374A CN112551953A CN 112551953 A CN112551953 A CN 112551953A CN 202011409374 A CN202011409374 A CN 202011409374A CN 112551953 A CN112551953 A CN 112551953A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 title claims abstract description 43
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 43
- 230000008439 repair process Effects 0.000 title claims abstract description 26
- 229920000642 polymer Polymers 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 68
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 63
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 44
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 31
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 30
- 239000011575 calcium Substances 0.000 claims abstract description 26
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920000876 geopolymer Polymers 0.000 claims abstract description 13
- 239000000741 silica gel Substances 0.000 claims abstract description 8
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims description 16
- 239000000377 silicon dioxide Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 239000003513 alkali Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000012190 activator Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 239000005543 nano-size silicon particle Substances 0.000 claims description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 8
- 239000010883 coal ash Substances 0.000 claims description 5
- 238000007580 dry-mixing Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000005059 solid analysis Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 28
- 238000011056 performance test Methods 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 239000000499 gel Substances 0.000 description 5
- 239000003570 air Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- YAIQCYZCSGLAAN-UHFFFAOYSA-N [Si+4].[O-2].[Al+3] Chemical compound [Si+4].[O-2].[Al+3] YAIQCYZCSGLAAN-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229920003041 geopolymer cement Polymers 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation 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
- 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- 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
- C04B14/38—Fibrous materials; Whiskers
- C04B14/383—Whiskers
-
- 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
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
-
- 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
- C04B2111/00008—Obtaining or using nanotechnology related materials
-
- 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
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of road repairing materials, and particularly relates to a fly ash-based polymer mortar repairing material and a preparation method thereof, wherein the fly ash-based polymer mortar repairing material comprises the following components in parts by weight: 32-45 parts of low-calcium fly ash, 8-12 parts of water glass solution, 3-4 parts of NaOH, 1-2 parts of nano silica gel, 1.6-2.5 parts of steel fiber, 0.2-0.3 part of calcium carbonate whisker, 8-11 parts of pure water and 64-90 parts of medium sand. The geopolymer mortar repair material has the characteristics of cleanness, greenness, high strength, short open traffic time, good durability, strong interface effect of new and old concrete and good shrinkage performance.
Description
Technical Field
The invention belongs to the technical field of road repairing materials, and particularly relates to a fly ash-based polymer mortar repairing material and a preparation method thereof.
Background
Road traffic infrastructure in China is developed greatly, the total mileage of roads is the first place in the world, and at present, the total mileage of roads in China exceeds four million kilometers, wherein more than half of road surfaces are cement concrete road surfaces. As traffic volume and road surface loads increase, traditional early cement concrete roads suffer from different levels of damage, such as pitted surfaces, slab staggering, cracking, peeling, and the like. These disruptions can have a more severe impact on road traffic.
The traditional cement-based repairing material has the problems of weak bonding property of new and old cement concrete interfaces, large energy consumption and the like, gradually does not meet the requirement of quick green repairing, and limits the further application of the material. Therefore, a road patching material with excellent performance, high early strength, good interface bonding and small shrinkage is needed.
Geopolymers are a new class of inorganic gelling materials. The reaction mechanism is as follows: the silicon-aluminum oxide breaks aluminum-oxygen bonds (Al-O) and silicon-oxygen bonds (Si-O) in an alkaline environment, and the product forms an oligomeric structural unit by breaking oxygen bridges in medium water. The product has the advantages of fast setting and hardening, high early strength, high bonding strength, good durability and the like, and is an excellent repairing material. The fly ash is fine ash captured from flue gas after high-temperature calcination of raw coal, and the effective utilization rate of the fly ash in the world is only 20-30% according to statistics, and the fly ash is mostly used as a mineral component to have synergistic effect with portland cement. The rest of the fly ash is discarded in the landfill, causing pollution to soil, water and air. From the perspective of environmental protection, however, the fly ash has a good pozzolanic effect, does not need to consume a large amount of energy in the alkali excitation process, reduces unnecessary carbon dioxide emission, and conforms to the trend of the building industry for sustainable development. Therefore, the potential of the prepared geopolymer mortar repair material prepared by utilizing the fly ash can be better exerted, and the advantages of the repair material are fully utilized.
How to design a fly ash based polymer mortar repair material to replace the traditional cement repair material becomes a problem for those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide a fly ash based polymer mortar repair material.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the fly ash-based polymer mortar repair material comprises the following components in parts by weight:
32-45 parts of low-calcium fly ash, 8-12 parts of water glass solution, 3-4 parts of NaOH, 1-2 parts of nano silica gel, 1.6-2.5 parts of steel fiber, 0.2-0.3 part of calcium carbonate whisker, 8-11 parts of pure water and 64-90 parts of medium sand.
Preferably, the water glass is water glass for buildings, the Baume degree is 35-40, and the modulus of the water glass is 3.0-3.3.
Preferably, the NaOH is pure as a solid assay with a purity of 99.5%.
Preferably, the low-calcium powdered coal ash powder comprises Al2O3And SiO2(ii) a And the particle size of the low-calcium fly ash is within the range of 0.1-50 mu m.
Preferably, the particle size of the medium sand is within the range of 0.25mm-0.5mm, and the fineness modulus is 1.6-3.7.
Preferably, the colloidal nanosilica has an average particle size in the range of 8mm to 14mm, a solids content of 30% to 35%, and a pH of 7 to 7.5.
Preferably, the length of the steel fiber is 10mm-15mm, the diameter is 0.08mm-0.12mm, and the tensile strength is more than 1200 MPa; the length of the calcium carbonate crystal whisker is 3mm-5mm, the diameter is 2 μm-3 μm, and the tensile strength is more than 2200 MPa.
The invention also provides a preparation method of the fly ash-based polymer mortar repair material, which comprises the following steps:
s1, preparing 32-45 parts of low-calcium fly ash, 8-12 parts of water glass solution, 3-4 parts of NaOH, 1-2 parts of nano silica gel, 1.6-2.5 parts of steel fiber, 0.2-0.3 part of calcium carbonate whisker, 8-11 parts of pure water and 64-90 parts of medium sand by weight;
s2, mixing the water glass solution with NaOH to obtain an alkali activator, and standing for 24 hours;
s3, mixing the low-calcium fly ash and the medium sand, and performing dry mixing for 3-5 minutes to obtain a premix;
s4, adding the alkali activator, the colloidal nano-silica and the pure water obtained in the step S2 into the premix obtained in the step S3, and continuing to stir for 3-5 minutes;
and S5, after uniformly stirring, gradually adding the steel fibers and the calcium carbonate whiskers, and stirring for 3 minutes to obtain uniform slurry.
Compared with the prior art, the invention has the advantages that:
1. the geopolymer mortar repair material has the characteristics of cleanness, greenness, high strength, short open traffic time, good durability, strong interface effect of new and old concrete and good shrinkage performance.
2. The invention adopts colloidal nano silicon dioxide and multi-scale fiber, and fully exerts the synergistic optimization effect of the colloidal nano silicon dioxide and the multi-scale fiber on the performance of the geopolymer concrete test block: the colloidal nanosilica fills a portion of the polymer pores and the reaction during the polymerization process produces a large amount of reaction products of aluminosilicate gel and the primary raw materials, making the matrix more dense. The steel fiber and the calcium carbonate whisker have larger size and length difference to form a multi-scale fiber system, which can further increase the toughness of the geopolymer mortar, restrain the plastic deformation of the material and bear a part of internal force. The addition of the materials reduces the construction cost and improves the performance and the construction performance of the materials.
3. The fly ash-based mortar repair material doped with colloidal nano-silica and multi-scale fibers has a simple preparation process and is easy to popularize.
Detailed Description
The following detailed description of specific embodiments of the present invention is provided to facilitate understanding and appreciation of the inventive concepts.
Example 1:
the fly ash-based polymer mortar repair material comprises the following components in parts by weight:
32 parts of low-calcium fly ash, 8 parts of water glass solution, 3 parts of NaOH, 1 part of nano-silica gel, 1.6 parts of steel fiber, 0.2 part of calcium carbonate whisker, 8 parts of pure water and 64 parts of medium sand.
Wherein the water glass is water glass for buildings, the Baume degree is 35-40, and the modulus of the water glass is 3.0-3.3.
Better performance can be obtained by adding colloidal nano-silica to the mortar mixture; this is attributed to the better dispersibility of colloidal nanosilica, the large specific surface area and the greatly reduced degree of agglomeration. The nanoparticles fill more into the pores and participate in the reaction. The colloidal nanosilica fine particles fill a portion of the pores, reducing the porosity. The reaction during the polymerization process generates a large amount of reaction products of aluminosilicate gel and the main raw materials, so that amorphous compounds in the matrix are converted into crystalline compounds;
the multi-scale fibers are wrapped and distributed between the aggregate joint surfaces through the geopolymer cementing material, so that the stress distribution of the weakest area in the mortar is obviously improved, and the generation of cracks is reduced; the fiber bears most of the force when the mortar is acted by external force, thereby improving the toughness and the crack resistance of the matrix. And the intermingling of different sized fibers can produce a different intermingling effect than a single fiber.
In this example, NaOH was pure as a solid, and the purity was 99.5%.
The low-calcium powdered coal ash powder comprises Al2O3And SiO2(ii) a And the particle size of the low-calcium fly ash is within the range of 0.1-50 mu m.
The grain diameter of the medium sand is within the range of 0.25mm-0.5mm, and the fineness modulus is 1.6-3.7.
The colloidal nano silicon dioxide has the average particle diameter of 8mm-14mm, the solid content of 30% -35% and the PH value of 7-7.5.
The length of the steel fiber is 10mm-15mm, the diameter is 0.08mm-0.12mm, and the tensile strength is more than 1200 MPa; the length of the calcium carbonate crystal whisker is 3mm-5mm, the diameter is 2 μm-3 μm, and the tensile strength is more than 2200 MPa.
The preparation method of the fly ash-based polymer mortar repair material comprises the following steps:
s1, preparing the following materials in parts by weight:
the main component is Al2O3And SiO232 parts of low-calcium fly ash with the particle size of 0.1-50 mu m;
the Baume degree is 35-40, the modulus is 8 parts of 3.0-3.3 water glass solution;
3 parts of NaOH with the purity of 99.5 percent;
1 part of nano silicon dioxide gel with the average grain diameter of 8mm-14mm, the solid content of 30% -35% and the PH value of 7-7.5;
1.6 parts of steel fiber with the length of 10mm-15mm, the diameter of 0.08mm-0.12mm and the tensile strength of more than 1200 MPa;
0.2 portion of calcium carbonate crystal whisker with the length of 3mm-5mm, the diameter of 2 μm-3 μm and the tensile strength of more than 2200 MPa;
8 parts of pure water;
64 parts of medium sand with the grain diameter of 0.25mm-0.5mm and the fineness modulus of 1.6-3.7.
S2, mixing the water glass solution and NaOH to obtain the alkali activator, and standing for 24 hours.
And S3, mixing the low-calcium fly ash and the medium sand, and performing dry mixing for 3-5 minutes to obtain the premix.
S4, adding the alkali activator obtained in the step S2, colloidal nano silica and pure water to the premix obtained in the step S3, and then continuing to stir for 3-5 minutes.
And S5, after uniformly stirring, gradually adding the steel fibers and the calcium carbonate whiskers, and stirring for 3 minutes to obtain uniform slurry.
When in use, the slurry is directly smeared at the crack or injected into a mould for maintenance according to different purposes.
And (3) carrying out a compressive strength test and an anti-bending test according to 'a basic performance test method of building mortar' JGJ/T70-2009. Specifically, the method comprises the following steps:
the compression strength test adopts a mortar test block of 100 × 100mm, and the test instrument is an WEW-2000D universal tester. The anti-breaking strength test selects a 40X 160mm mortar test block, and the test instrument is a DYE-2000 electrohydraulic pressure tester. The specific data are as follows:
| Time | 3 days | 7 days | 14 days | 28 days |
| Compressive strength (MPa) | 7.1 | 12.0 | 28.5 | 36.1 |
| Flexural strength (MPa) | 1.9 | 3.7 | 5.8 | 7.4 |
A void fraction of 13.6% for 28 days; the porosity testing method comprises the following steps: according to the basic performance test method for building mortar JGJ/T70-2009, apparent porosity measurements were made by measuring the saturated mass in air, the saturated mass immersed in water and the dry mass of three 50mm x 50mm cubic specimens.
Example 2
The fly ash-based polymer mortar repair material comprises the following components in parts by weight:
45 parts of low-calcium fly ash, 12 parts of water glass solution, 4 parts of NaOH, 2 parts of nano-silica gel, 2.5 parts of steel fiber, 0.3 part of calcium carbonate whisker, 11 parts of pure water and 90 parts of medium sand.
Wherein the water glass is water glass for buildings, the Baume degree is 35-40, and the modulus of the water glass is 3.0-3.3.
NaOH is pure in solid analysis, and the purity is 99.5%.
The low-calcium powdered coal ash powder comprises Al2O3And SiO2(ii) a And the particle size of the low-calcium fly ash is within the range of 0.1-50 mu m.
The grain diameter of the medium sand is within the range of 0.25mm-0.5mm, and the fineness modulus is 1.6-3.7.
The colloidal nano silicon dioxide has the average particle diameter of 8mm-14mm, the solid content of 30% -35% and the PH value of 7-7.5.
The length of the steel fiber is 10mm-15mm, the diameter is 0.08mm-0.12mm, and the tensile strength is more than 1200 MPa; the length of the calcium carbonate crystal whisker is 3mm-5mm, the diameter is 2 μm-3 μm, and the tensile strength is more than 2200 MPa.
The preparation method of the fly ash-based polymer mortar repair material comprises the following steps:
s1, preparing the following materials in parts by weight:
the main component is Al2O3And SiO245 parts of low-calcium fly ash with the particle size of 0.1-50 mu m;
baume degree 35-40, modulus 3.0-3.3 water glass solution 12 parts;
4 parts of NaOH with the purity of 99.5 percent;
2 parts of nano silicon dioxide gel with the average particle size of 8mm-14mm, the solid content of 30% -35% and the PH value of 7-7.5;
2.5 parts of steel fiber with the length of 10mm-15mm, the diameter of 0.08mm-0.12mm and the tensile strength of more than 1200 MPa;
0.3 portion of calcium carbonate crystal whisker with the length of 3mm-5mm, the diameter of 2 μm-3 μm and the tensile strength of more than 2200 MPa;
11 parts of pure water;
90 portions of medium sand with the grain diameter of 0.25mm-0.5mm and the fineness modulus of 1.6-3.7.
S2, mixing the water glass solution and NaOH to obtain the alkali activator, and standing for 24 hours.
And S3, mixing the low-calcium fly ash and the medium sand, and performing dry mixing for 3-5 minutes to obtain the premix.
S4, adding the alkali activator obtained in the step S2, colloidal nano silica and pure water to the premix obtained in the step S3, and then continuing to stir for 3-5 minutes.
And S5, after uniformly stirring, gradually adding the steel fibers and the calcium carbonate whiskers, and stirring for 3 minutes to obtain uniform slurry.
When in use, the slurry is directly smeared at the crack or injected into a mould for maintenance according to different purposes.
And (3) carrying out a compressive strength test and an anti-bending test according to 'a basic performance test method of building mortar' JGJ/T70-2009. Specifically, the method comprises the following steps:
the compression strength test adopts a mortar test block of 100 × 100mm, and the test instrument is an WEW-2000D universal tester. The anti-breaking strength test selects a 40X 160mm mortar test block, and the test instrument is a DYE-2000 electrohydraulic pressure tester. The specific data are as follows:
| Time | 3 days | 7 days | 14 days | 28 days |
| Compressive strength (MPa) | 7.6 | 12.9 | 29.7 | 37.2 |
| Flexural strength (MPa) | 1.8 | 3.6 | 5.6 | 7.4 |
Void fraction 28 days 14.2%; the porosity testing method comprises the following steps: according to the basic performance test method for building mortar JGJ/T70-2009, apparent porosity measurements were made by measuring the saturated mass in air, the saturated mass immersed in water and the dry mass of three 50mm x 50mm cubic specimens.
Example 3
The fly ash-based polymer mortar repair material comprises the following components in parts by weight:
40 parts of low-calcium fly ash, 10 parts of water glass solution, 3.5 parts of NaOH, 1.5 parts of nano silica gel, 2 parts of steel fiber, 0.25 part of calcium carbonate whisker, 10 parts of pure water and 75 parts of medium sand.
Wherein the water glass is water glass for buildings, the Baume degree is 35-40, and the modulus of the water glass is 3.0-3.3.
NaOH is pure in solid analysis, and the purity is 99.5%.
The low-calcium powdered coal ash powder comprises Al2O3And SiO2(ii) a And the particle size of the low-calcium fly ash is within the range of 0.1-50 mu m.
The grain diameter of the medium sand is within the range of 0.25mm-0.5mm, and the fineness modulus is 1.6-3.7.
The colloidal nano silicon dioxide has the average particle diameter of 8mm-14mm, the solid content of 30% -35% and the PH value of 7-7.5.
The length of the steel fiber is 10mm-15mm, the diameter is 0.08mm-0.12mm, and the tensile strength is more than 1200 MPa; the length of the calcium carbonate crystal whisker is 3mm-5mm, the diameter is 2 μm-3 μm, and the tensile strength is more than 2200 MPa.
The preparation method of the fly ash-based polymer mortar repair material comprises the following steps:
s1, preparing the following materials in parts by weight:
the main component is Al2O3And SiO240 parts of low-calcium fly ash with the particle size of 0.1-50 mu m;
baume degree 35-40, modulus 3.0-3.3 water glass solution 10 parts;
3.5 parts of NaOH with the purity of 99.5 percent;
1.5 parts of nano silicon dioxide gel with the average particle size of 8-14 mm, the solid content of 30-35 percent and the PH value of 7-7.5;
2 parts of steel fiber with the length of 10mm-15mm, the diameter of 0.08mm-0.12mm and the tensile strength of more than 1200 MPa;
0.25 portion of calcium carbonate crystal whisker with the length of 3mm-5mm, the diameter of 2 μm-3 μm and the tensile strength of more than 2200 MPa;
10 parts of pure water;
75 portions of medium sand with the grain diameter of 0.25mm-0.5mm and the fineness modulus of 1.6-3.7.
S2, mixing the water glass solution and NaOH to obtain the alkali activator, and standing for 24 hours.
And S3, mixing the low-calcium fly ash and the medium sand, and performing dry mixing for 3-5 minutes to obtain the premix.
S4, adding the alkali activator obtained in the step S2, colloidal nano silica and pure water to the premix obtained in the step S3, and then continuing to stir for 3-5 minutes.
And S5, after uniformly stirring, gradually adding the steel fibers and the calcium carbonate whiskers, and stirring for 3 minutes to obtain uniform slurry.
When in use, the slurry is directly smeared at the crack or injected into a mould for maintenance according to different purposes.
And (3) carrying out a compressive strength test and an anti-bending test according to 'a basic performance test method of building mortar' JGJ/T70-2009. Specifically, the method comprises the following steps:
the compression strength test adopts a mortar test block of 100 × 100mm, and the test instrument is an WEW-2000D universal tester. The anti-breaking strength test selects a 40X 160mm mortar test block, and the test instrument is a DYE-2000 electrohydraulic pressure tester. The specific data are as follows:
a porosity of 13.8% for 28 days; the porosity testing method comprises the following steps: according to the basic performance test method for building mortar JGJ/T70-2009, apparent porosity measurements were made by measuring the saturated mass in air, the saturated mass immersed in water and the dry mass of three 50mm x 50mm cubic specimens.
The above are only typical examples of the present invention, and besides, the present invention may have other embodiments, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the present invention.
Claims (8)
1. A fly ash-based polymer mortar repair material is characterized in that: the paint comprises the following components in parts by weight:
32-45 parts of low-calcium fly ash, 8-12 parts of water glass solution, 3-4 parts of NaOH, 1-2 parts of nano silica gel, 1.6-2.5 parts of steel fiber, 0.2-0.3 part of calcium carbonate whisker, 8-11 parts of pure water and 64-90 parts of medium sand.
2. The fly ash based geopolymer mortar repair material as claimed in claim 1, wherein: the water glass is water glass for buildings, the Baume degree is 35-40, and the modulus of the water glass is 3.0-3.3.
3. The fly ash based geopolymer mortar repair material as claimed in claim 1, wherein: NaOH is pure in solid analysis, and the purity is 99.5%.
4. The fly ash based geopolymer mortar repair material as claimed in claim 1, wherein: the low-calcium powdered coal ash powder comprises Al2O3And SiO2(ii) a And the particle size of the low-calcium fly ash is within the range of 0.1-50 mu m.
5. The fly ash based geopolymer mortar repair material as claimed in claim 1, wherein: the grain diameter of the medium sand is within the range of 0.25mm-0.5mm, and the fineness modulus is 1.6-3.7.
6. A fly ash based geopolymer mortar repair material according to claims 1-5, characterized in that: the colloidal nano silicon dioxide has the average particle diameter of 8mm-14mm, the solid content of 30% -35% and the PH value of 7-7.5.
7. The fly ash based geopolymer mortar repair material as claimed in claim 1, wherein: wherein the length of the steel fiber is 10mm-15mm, the diameter is 0.08mm-0.12mm, and the tensile strength is more than 1200 MPa; the length of the calcium carbonate crystal whisker is 3mm-5mm, the diameter is 2 μm-3 μm, and the tensile strength is more than 2200 MPa.
8. The method for preparing the fly ash based geopolymer mortar repair material according to any one of claims 1 to 7, which is characterized by comprising the following steps:
s1, preparing 32-45 parts of low-calcium fly ash, 8-12 parts of water glass solution, 3-4 parts of NaOH, 1-2 parts of nano silica gel, 1.6-2.5 parts of steel fiber, 0.2-0.3 part of calcium carbonate whisker, 8-11 parts of pure water and 64-90 parts of medium sand by weight;
s2, mixing the water glass solution with NaOH to obtain an alkali activator, and standing for 24 hours;
s3, mixing the low-calcium fly ash and the medium sand, and performing dry mixing for 3-5 minutes to obtain a premix;
s4, adding the alkali activator, the colloidal nano-silica and the pure water obtained in the step S2 into the premix obtained in the step S3, and continuing to stir for 3-5 minutes;
and S5, after uniformly stirring, gradually adding the steel fibers and the calcium carbonate whiskers, and stirring for 3 minutes to obtain uniform slurry.
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