CN114956748A - Polyacrylic acid emulsion modified alkali-activated slag material for repairing and preparation method thereof - Google Patents
Polyacrylic acid emulsion modified alkali-activated slag material for repairing and preparation method thereof Download PDFInfo
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- CN114956748A CN114956748A CN202210373364.9A CN202210373364A CN114956748A CN 114956748 A CN114956748 A CN 114956748A CN 202210373364 A CN202210373364 A CN 202210373364A CN 114956748 A CN114956748 A CN 114956748A
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- activated slag
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- 239000002893 slag Substances 0.000 title claims abstract description 103
- 239000003513 alkali Substances 0.000 title claims abstract description 74
- 229920002125 Sokalan® Polymers 0.000 title claims abstract description 72
- 239000004584 polyacrylic acid Substances 0.000 title claims abstract description 72
- 239000000839 emulsion Substances 0.000 title claims abstract description 69
- 239000000463 material Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title abstract description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 93
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims description 9
- 230000008439 repair process Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000004570 mortar (masonry) Substances 0.000 description 25
- 238000012360 testing method Methods 0.000 description 21
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 17
- 230000007797 corrosion Effects 0.000 description 13
- 238000005260 corrosion Methods 0.000 description 13
- 239000004567 concrete Substances 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 206010003549 asthenia Diseases 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000004566 building material Substances 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000012496 blank sample Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
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- 238000002329 infrared spectrum Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 238000012644 addition polymerization Methods 0.000 description 1
- 238000007718 adhesive strength test Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000004132 cross linking Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229920000876 geopolymer Polymers 0.000 description 1
- 239000005414 inactive ingredient Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004660 morphological change Effects 0.000 description 1
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- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 239000000523 sample Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
Images
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
- C04B28/02—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
- C04B28/08—Slag cements
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a polyacrylic acid emulsion modified alkali-activated slag material for repairing, which comprises the following components in parts by weight: 30.41-35.96 parts of water glass, 3.21-5.70 parts of sodium hydroxide, 1-2 parts of polyacrylic acid, 100 parts of slag, 300 parts of river sand and 35.84-38.89 parts of water. The preparation method comprises the following steps: dissolving weighed sodium hydroxide in water glass, stirring until the sodium hydroxide is fully dissolved, covering a film on a beaker, and cooling to room temperature for later use; pouring the prepared water glass solution into a stirring pot, adding the polyacrylic acid emulsion, the slag, the river sand and the water, and stirring and forming to obtain the polyacrylic acid emulsion modified alkali-activated slag material for repairing. The invention has high strength, good durability, high bonding strength and small shrinkage.
Description
Technical Field
The invention relates to a repairing material and preparation thereof, in particular to a polyacrylic emulsion modified alkali-activated slag material for repairing and a preparation method thereof.
Background
The problem of cracks in concrete structures is a not negligible problem in engineering. Concrete is heterogeneous and heterogeneousThe generation of cracks of the brittle material is almost unavoidable, and is determined by the physical property and the mechanical property of the brittle material, the concrete structure is influenced by adverse factors such as fatigue damage, temperature, shrinkage, uneven settlement and the like in the using process, and deformation and damage accumulation can be generated in the concrete due to different properties such as thermal expansion coefficients, elastic modulus and the like of various materials in the concrete, so that fine cracks and local damage can be inevitably generated. The appearance of the concrete is affected by the generation of cracks, more importantly, the bending strength of the concrete is greatly reduced, and the concrete is CO 2 、NO x 、H 2 S, water, sulfate, chloride and other corrosion concrete provide channels, and greatly influence the service life of the structure. Cracks are a precursor to failure and when the size and number of cracks develop to a certain extent, structural failure will result.
Alkali-activated cement is an inorganic non-metallic material that has been newly developed in recent years and is prepared from an alkali activator and an active inorganic cement, also called a geopolymer. The alkali-activated cementing material does not need to be calcined by clinker, the carbon dioxide emission amount can be reduced by about 80 percent compared with the ordinary Portland cement during preparation, and industrial waste can be greatly utilized, so the alkali-activated cementing material is an environment-friendly building material. The alkali-activated cementing material has the characteristics of early strength, corrosion resistance, water and seepage resistance, high temperature resistance, simple production process, good compactness and the like, and is developed and applied to the fields of novel ceramic materials, concrete rapid repair materials, heat-insulating coatings, corrosion-resistant coatings and the like.
The slag is used as one of alkali-activated cementing materials and is powder obtained by processing blast furnace slag, and the higher the alkalinity coefficient, activity coefficient and mass coefficient of the slag is, the higher the activity of slag micro powder is. The alkalinity coefficient is more than 1, and the slag belongs to alkaline slag; the activity coefficient is higher than 0.25, and the slag belongs to high-activity slag; the mass coefficient is more than 1.2, and the slag belongs to high-quality slag; the hydraulic coefficient is more than 1, and the content of active ingredients in the slag is more than that of inactive ingredients. However, the alkali-activated slag material has high brittleness and high shrinkage rate, and is difficult to effectively repair concrete cracks.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a polyacrylic acid emulsion modified alkali-activated slag material for repairing and a preparation method thereof, and solves the problems of high brittleness and high shrinkage rate of the existing alkali-activated slag material.
The technical scheme is as follows: the polyacrylic acid emulsion modified alkali-activated slag material for repairing comprises the following components in parts by weight:
30.41-35.96 parts of water glass, 3.21-5.70 parts of sodium hydroxide, 1-2 parts of polyacrylic acid, 100 parts of slag, 300 parts of river sand and 35.84-38.89 parts of water.
The strength development is facilitated, the stirring forming is facilitated, the modulus of the water glass is 3.3, and the baume degree is 40.
The solid content of the polyacrylic acid is more than or equal to 30 percent.
The hydraulic coefficient of the slag is 2.18, the activity coefficient is 0.25, the alkalinity coefficient is 1.11, the mass coefficient is 2.07, the particle size distribution is d (0.1) is 1.647um, d (0.5) is 9.490um, and d (0.9) is 27.984 um.
The river sand has the maximum grain diameter of 2.5mm and the bulk density of 1.6g/cm 3 Apparent density of 2.5g/cm 3 。
The preparation method of the polyacrylic acid emulsion modified alkali-activated slag material for repairing, disclosed by the invention, comprises the following steps of:
(1) dissolving weighed sodium hydroxide in water glass, stirring until the sodium hydroxide is fully dissolved, covering a film on a beaker, and cooling to room temperature for later use;
(2) pouring the water glass solution prepared in the step (1) into a stirring pot, adding polyacrylic acid emulsion, slag, river sand and water, and stirring and forming to obtain the polyacrylic acid emulsion modified alkali-activated slag material for repairing.
The technical mechanism is as follows: the raw materials adopted by the invention are that polyacrylic emulsion is filled in gaps of amorphous gelled substances, is connected to two sides of a matrix, is embedded into the matrix and mutually overlapped to form a net structure, thereby enhancing the material strength, reducing the generation of microcracks, and delaying the evaporation and the dissipation of water in the matrix, so that the shrinkage rate is reduced.
Has the advantages that: the invention takes the slag as the main raw material, does not need to calcine the clinker, can reduce the emission of carbon dioxide by about 80 percent compared with the emission of the common Portland cement during the preparation, can also greatly utilize industrial waste, and is an environment-friendly building material. In addition, the alkali-activated slag cementing material has the characteristics of early strength, corrosion resistance, water and permeability resistance, high temperature resistance, simple production process, good compactness and the like; the performance of the alkali-activated slag cementing material is further improved by adding polyacrylic acid emulsion for modification, and the alkali-activated slag repairing material with high strength, good durability, high bonding strength and small shrinkage can be prepared by optimizing the proportioning design; the raw materials used are wide in source and low in preparation cost, the defect of high cost in the prior art is overcome, and the preparation method is simple in equipment, convenient to operate and easy for industrial production.
Drawings
FIG. 1 shows the flexural strength and compressive strength of alkali-activated slag materials with different sodium silicate moduli, with 1% and 2% slag weight percentage of polyacrylic acid emulsion being incorporated;
FIG. 2 shows the adhesive strength of the alkali-activated slag material after modification with the polyacrylic acid emulsion;
FIG. 3 is the drying shrinkage data for alkali-activated slag mortars of different polyacrylic acid loadings;
FIG. 4 is the strength of polyacrylic acid emulsion modified alkali-activated slag mortar after sulfate attack;
FIG. 5 is a graph showing the corrosion resistance coefficient of alkali-activated slag mortars with different polyacrylic acid loadings;
FIG. 6 shows the strength loss of alkali-activated slag under sulfate attack with different polyacrylic acid loadings;
FIG. 7 is an XRD pattern of polyacrylic acid emulsion with a mixing amount of 1 wt% and 2 wt%, respectively;
FIG. 8 is a diagram of the morphology of 7 d-age slurry of polyacrylic acid emulsion with different mixing amounts;
FIG. 9 is SEM photographs before and after the alkali-activated slag mortar attacks the sodium sulfate solution;
FIG. 10 is an infrared spectrum of polyacrylic acid emulsion modified alkali-activated slag neat paste with different doping amounts.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The raw material modulus of the water glass adopted in the following examples is 3.3, the baume degree is 40, and the modulus of the water glass is regulated and controlled by sodium hydroxide in each example to obtain the water glass with different moduli.
Example 1
A polyacrylic acid emulsion modified alkali-activated slag material (1#) for repairing comprises the following components in parts by mass:
30.41 parts of water glass
5.70 parts of sodium hydroxide
100 portions of slag
300 portions of river sand
38.89 parts of water
The preparation method of the polyacrylic acid emulsion modified alkali-activated slag material for repairing comprises the following steps:
1) dissolving weighed sodium hydroxide in water glass, using a magnetic stirrer to fully dissolve the sodium hydroxide (the modulus of the water glass is 1.2), coating a film on a beaker, and cooling to room temperature for later use, wherein sodium hydroxide particles do not exist in the solution;
2) pouring the prepared water glass solution into a stirring pot, adding polyacrylic acid emulsion, slag, river sand and water, and stirring and forming;
example 2
A polyacrylic acid emulsion modified alkali-activated slag material (1#) for repairing comprises the following components in parts by mass:
30.41 parts of water glass
5.70 portions of sodium hydroxide
100 portions of slag
300 portions of river sand
38.89 parts of water
The preparation method of the polyacrylic acid emulsion modified alkali-activated slag material for repairing comprises the following steps:
1) dissolving weighed sodium hydroxide in water glass, using a magnetic stirrer to fully dissolve the sodium hydroxide (the modulus of the water glass is 1.2), coating a film on a beaker, and cooling to room temperature for later use, wherein sodium hydroxide particles do not exist in the solution;
2) pouring the prepared water glass solution into a stirring pot, adding polyacrylic acid emulsion, slag, river sand and water, and stirring and forming;
example 3
A polyacrylic acid emulsion modified alkali-activated slag material (1#) for repairing comprises the following components in parts by mass:
33.51 parts of water glass
Sodium hydroxide 4.31 parts
100 portions of slag
300 portions of river sand
37.18 parts of water
The preparation method of the polyacrylic acid emulsion modified alkali-activated slag material for repairing comprises the following steps:
1) dissolving weighed sodium hydroxide in water glass, using a magnetic stirrer to fully dissolve the sodium hydroxide (the modulus of the water glass is 1.5), coating a film on a beaker, and cooling to room temperature for later use;
2) pouring the prepared water glass solution into a stirring pot, adding polyacrylic acid emulsion, slag, river sand and water, and stirring and forming;
example 4
A polyacrylic acid emulsion modified alkali-activated slag material (1#) for repairing comprises the following components in parts by mass:
33.51 parts of water glass
Sodium hydroxide 4.31 parts
100 portions of slag
300 portions of river sand
37.18 parts of water
The preparation method of the polyacrylic acid emulsion modified alkali-activated slag material for repairing comprises the following steps:
1) dissolving weighed sodium hydroxide in water glass, using a magnetic stirrer to fully dissolve the sodium hydroxide (the modulus of the water glass is 1.5), coating a film on a beaker, and cooling to room temperature for later use;
2) pouring the prepared water glass solution into a stirring pot, adding polyacrylic acid emulsion, slag, river sand and water, and stirring and forming;
example 5
A polyacrylic acid emulsion modified alkali-activated slag material (1#) for repairing comprises the following components in parts by mass:
35.96 portions of water glass
3.21 parts of sodium hydroxide
100 portions of slag
300 portions of river sand
35.84 portions of water
The preparation method of the polyacrylic acid emulsion modified alkali-activated slag material for repairing comprises the following steps:
1) dissolving weighed sodium hydroxide into water glass, and fully dissolving the sodium hydroxide by using a magnetic stirrer (the modulus of the water glass is 1.8); no sodium hydroxide particles exist in the solution, a beaker is coated with a film, and the beaker is cooled to room temperature for later use;
2) pouring the prepared water glass solution into a stirring pot, adding polyacrylic acid emulsion, slag, river sand and water, and stirring and forming;
example 6
A polyacrylic acid emulsion modified alkali-activated slag material (1#) for repairing comprises the following components in parts by mass:
35.96 parts of water glass
3.21 parts of sodium hydroxide
100 portions of slag
300 portions of river sand
35.84 portions of water
The preparation method of the polyacrylic acid emulsion modified alkali-activated slag material for repairing comprises the following steps:
1) dissolving weighed sodium hydroxide in water glass, using a magnetic stirrer to fully dissolve the sodium hydroxide (the modulus of the water glass is 1.8), coating a film on a beaker, and cooling to room temperature for later use;
2) pouring the prepared water glass solution into a stirring pot, adding polyacrylic acid emulsion, slag, river sand and water, and stirring and forming;
the performance analysis of various parameters of the raw materials used in the embodiments 1 to 6 and the prepared polyacrylic acid emulsion modified alkali-activated slag material for repairing includes:
carrying out a compression strength and bending strength experiment by using an AEC-201 type cement strength testing machine;
testing the lengths of the test pieces with different curing times by using an SP-175 comparator, and calculating the shrinkage rate;
the mortar test block formed by ordinary portland cement is prepared in advance in the experiment, when the test block is maintained to 28 days, an electric saw is used for sawing the test block into two identical parts, the cross section is grooved, the depth is 2-3mm, the occlusal force of a bonding surface is increased, and then alkali-activated slag mortar is poured. Testing the bonding strength on an anti-bending testing machine after the standard curing room is cured to a specified age;
preparing two groups of same mortar test blocks according to the proportion, curing for 24 hours under standard conditions, then demoulding, putting the demoulded test piece into 50 ℃ water for curing for 7 days, after curing, putting the first group into 20 ℃ water for curing, and soaking the second group in 3 mass percent of Na 2 SO 4 In solution, 0.5mol/l of H is used per day 2 SO 4 The solution was titrated to neutralize the alkali that had precipitated in the test piece and the flexural test was performed when the soaking time reached 28 days. The ratio of 28d flexural strength of the mortar test block soaked in the sulfate solution to 28d flexural strength of the mortar test block soaked in water is the corrosion resistance coefficient.
Analyzing the microstructure of the polyacrylic acid emulsion modified alkali-activated slag material for repairing by using a scanning electron microscope;
characterizing the pore structure of the polyacrylic acid emulsion modified alkali-activated slag material by a mercury porosimeter;
the chemical components of the polyacrylic acid emulsion modified alkali-activated slag material are researched and analyzed by using Fourier transform infrared spectroscopy;
specifically, as shown in FIGS. 1 to 10:
FIG. 1 shows the mortar strength of alkali-activated slag for different polypropylene emulsions in examples 1-6. In all the examples, the 28d flexural strength is higher than that of the blank group, and the 28d flexural strength of the groups of examples 1, 3 and 5 is respectively improved by 8 percent, 15 percent and 6 percent and reaches 8.9 MPa; in all the examples, the 28d strength is higher than 50MPa, the requirement of the compressive strength of the repair material is met, the compressive strength of the examples 1 and 3 is higher than that of the blank group, the 28d compressive strength is improved by 12 percent and 6 percent and respectively reaches 69.71MPa and 68.33MPa, and the influence of the examples 5 and 6 on the compressive strength of the alkali-activated slag mortar is small.
FIG. 2 shows the adhesive strength of examples 1-2, 3-4 and 5-6, the adhesive strength increases with the addition of the emulsion when the water glass modulus is 1.2, 1.5 and 1.8, the highest adhesive strength of examples 2, 4 and 6 is 3.63MPa, 3.56MPa and 3.12MPa, respectively, which meets the requirements of building material industry standards on the adhesive strength of repair mortar, and all the adhesive strength tests are firstly broken at the adhesive interface.
FIG. 3 shows the drying shrinkage of examples 1 to 2, 3 to 4 and 5 to 6, and the shrinkage rate becomes stable after 28 days. The shrinkage at 28d in the examples 1 and 2 was lower than that in the blank sample without addition polymerization of the acrylic emulsion, and the shrinkage reduction effect was the best in the example 1, and the shrinkage was 21% lower than that in the blank sample. The shrinkage of the alkali activated slag mortar samples was reduced in all of examples 3-4, and the shrinkage of example 3 was the smallest and was 54% lower than that of the blank without the addition of the polyacrylic acid. The shrinkage of the alkali-activated slag mortar samples was also reduced in examples 5-6, and the shrinkage of example 3 was the smallest, with 28d being 15% lower than the blank. By adding the polyacrylic acid emulsion, the shrinkage rate of the alkali-activated slag cementing material is remarkably reduced, because the polyacrylic acid emulsion improves the flexural strength of the alkali-activated slag, reduces the generation of microcracks, and therefore the shrinkage rate is reduced.
Fig. 4 shows the strength of the polyacrylic emulsion modified alkali-activated slag mortar in examples 1 to 6 after sulfate corrosion, the strength of the test block after soaking in sulfate is reduced slightly, the compressive strengths of the mortar test block without the emulsion after sulfate corrosion are 65.24MPa, 61.10MPa and 65.59MPa, the strength of the mortar test block without the emulsion after sulfate corrosion is slightly higher than that of the blank group, and the flexural strength and the strength of the mortar test block without the emulsion are changed slightly. Example 6 compressive strength was 21% higher than the blank group, respectively.
Fig. 5 shows the corrosion resistance coefficient of the alkali-activated slag mortar in examples 1 to 6, which should be greater than 0.85, and experiments show that the corrosion resistance coefficient of all the components is greater than 0.85, which meets the requirement of the building material industry on the corrosion resistance coefficient of the repair mortar.
Fig. 6 shows the strength loss of alkali-activated slag under the corrosion of sulfate in examples 1 to 6, the compressive strength loss of the alkali-activated slag mortar after soaking in the sulfate solution is within 12%, and the compressive strength loss of the added polyacrylic acid solution is small. The strength loss of the alkali-activated slag mortar of the blank groups was 9%, 10%, and 5% respectively at water glass moduli of 1.2, 1.5, and 1.8, and the strength loss was the lowest in each group of examples 3, 6, and 7, 5%, and 2%, respectively, after the addition of the polyacrylic acid emulsion. The addition of the polymer solution improves the sulfate attack resistance of the alkali-activated slag material.
FIG. 7 is an XRD pattern in which the blending amounts of polyacrylic acid emulsion are 1 wt% and 2 wt%, the components in the slag are basically amorphous substances, the base of the alkali-activated slag neat paste control group without the addition of the polymer emulsion is mostly amorphous substances, a dispersion peak appears at about 30 degrees 2 theta in the pattern, the dispersion peak is a diffraction peak of C-S-H gel, and the pattern has a large amount of CaCO 3 The diffraction peak of (1). It can be seen that the XRD spectrum of the alkali-activated slag clean slurry cured 28d formed after the polyacrylic emulsion is added for modification is basically consistent with the spectrum peak value and the peak height of a sample without the polymer emulsion, no new mineral crystalline phase is generated, the diffraction peak or the peak intensity is very weak, and the main crystalline phase is still an amorphous mineral phase. The analysis of the bonding strength shows that the flexural strength and the compressive strength of the polymer emulsion on the alkali-activated slag clear slurry are improved not because of the chemical reaction to form a new high-strength product but because of the physical gap filling and crosslinking effects of the polymer emulsion.
FIG. 8 is a structural diagram of slurry of 7d age with different amounts of polyacrylic acid emulsion, the alkali-activated slag clear slurry added with polyacrylic acid emulsion has neat and compact cross section, and the hydration product amount in the slurry is continuously increased and gradually and uniformly distributed in 7 days, so that the cross section is flat and compact, a small amount of particles are wrapped by the hydration product slurry as can be seen in (c) and (d), and the surfaces of the slag particles in other figures are smooth and have no attachment.
Fig. 9 is SEM photographs before and after the alkali-activated slag mortar attacks the sodium sulfate solution, and it can be seen from the photographs that the SEM photographs did not show a significant morphological change before and after the sulfate attack and the microstructure morphology was similar. (a) Compared with the (b), the test block before sulfate erosion has a smooth and fine surface and a more compact structure, and the alkali-activated slag mortar after sulfate erosion forms a small amount of microcracks, which may be formed by the existence of unreacted slag particles to sulfate and is one of the factors influencing the sulfate erosion resistance of the test block.
FIG. 10 is an infrared spectrum of a polyacrylic acid emulsion modified alkali-activated slag neat paste with different doping amounts, when a polyacrylic acid emulsion is doped, the characteristic peak is not much different from that of alkali-activated slag without the addition of the emulsion, which indicates that the chemical bond types contained in the hydration product are basically the same. 433.17cm after incorporation of the polyacrylic emulsion -1 The peak position is shifted to the high peak position, and the peak positions are respectively shifted to 441.26cm under different mixing amounts -1 ,441.39cm -1 ,437.29cm -1 This shows that the polymerization degree of the aluminum octahedron as the hydration product is increased when the polyacrylic acid emulsion is added in 1% or 2%. 953.81cm -1 The peak positions of the plants are shifted to 947.71 cm respectively -1 ,945.36cm -1 ,946.23cm -1 Here, the asymmetric stretching vibration of Si-O-Si (Al) is a characteristic peak, and the peak shifts to a low peak position after the incorporation of the polyacrylic emulsion, indicating that the polymerization of silicon-oxygen tetrahedron is not favored.
In conclusion, the test results show that the 28d flexural strength in all the examples is superior to that in the blank group, and the mechanical property of the alkali-activated slag mortar is generally improved when the mixing amount of the polyacrylic acid emulsion is lower. The adhesive strength of examples 1-6 was improved and the 28d shrinkage was less than the shrinkage of the blank. Examples 1-6 had less loss of strength after sulfate attack.
Claims (6)
1. The polyacrylic acid emulsion modified alkali-activated slag material for repairing is characterized by comprising the following components in parts by weight:
30.41-35.96 parts of water glass, 3.21-5.70 parts of sodium hydroxide, 1-2 parts of polyacrylic acid, 100 parts of slag, 300 parts of river sand and 35.84-38.89 parts of water.
2. The repair polyacrylic acid emulsion-modified alkali-activated slag material according to claim 1, wherein the water glass has a modulus of 3.3 and a baume degree of 40.
3. The repairing polyacrylic acid emulsion-modified alkali-activated slag material according to claim 1, wherein a solid content of the polyacrylic acid is 30% or more.
4. The polyacrylic acid emulsion-modified alkali-activated slag material for repair according to claim 1, wherein the slag hydraulic coefficient is 2.18, the coefficient of activity is 0.25, the coefficient of basicity is 1.11, the mass coefficient is 2.07, and the particle size distribution is d (0.1) of 1.647um, d (0.5) of 9.490um, and d (0.9) of 27.984 um.
5. The repair polyacrylic acid emulsion-modified alkali-activated slag material according to claim 1, wherein the river sand has a maximum particle diameter of 2.5mm and a bulk density of 1.6g/cm 3 Apparent density of 2.5g/cm 3 。
6. The method for producing a polyacrylic emulsion-modified alkali-activated slag material for repair according to any one of claims 1 to 5, comprising the steps of:
(1) dissolving weighed sodium hydroxide in water glass, stirring until the sodium hydroxide is fully dissolved, covering a film on a beaker, and cooling to room temperature for later use;
(2) pouring the water glass solution prepared in the step (1) into a stirring pot, adding polyacrylic acid emulsion, slag, river sand and water, and stirring and forming to obtain the polyacrylic acid emulsion modified alkali-activated slag material for repairing.
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