CN117361988A - Sulphoaluminate cement repair material and preparation method thereof - Google Patents
Sulphoaluminate cement repair material and preparation method thereof Download PDFInfo
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- CN117361988A CN117361988A CN202311166811.4A CN202311166811A CN117361988A CN 117361988 A CN117361988 A CN 117361988A CN 202311166811 A CN202311166811 A CN 202311166811A CN 117361988 A CN117361988 A CN 117361988A
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- cement
- sodium gluconate
- powder
- repair material
- sulfoaluminate cement
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- 239000004568 cement Substances 0.000 title claims abstract description 151
- 239000000463 material Substances 0.000 title claims abstract description 69
- 230000008439 repair process Effects 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 101
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000000176 sodium gluconate Substances 0.000 claims abstract description 86
- 229940005574 sodium gluconate Drugs 0.000 claims abstract description 86
- 235000012207 sodium gluconate Nutrition 0.000 claims abstract description 86
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 239000002994 raw material Substances 0.000 claims description 24
- 238000005303 weighing Methods 0.000 claims description 18
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 13
- 235000010755 mineral Nutrition 0.000 claims description 13
- 239000011707 mineral Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 4
- 239000010440 gypsum Substances 0.000 claims description 4
- 229910052602 gypsum Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 239000000654 additive Substances 0.000 abstract description 5
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 230000036632 reaction speed Effects 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 24
- 238000006703 hydration reaction Methods 0.000 description 23
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 21
- 230000036571 hydration Effects 0.000 description 21
- 239000002245 particle Substances 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000011398 Portland cement Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 7
- 239000004570 mortar (masonry) Substances 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 239000004567 concrete Substances 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011083 cement mortar Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 206010016807 Fluid retention Diseases 0.000 description 2
- GQCYCMFGFVGYJT-UHFFFAOYSA-N [AlH3].[S] Chemical compound [AlH3].[S] GQCYCMFGFVGYJT-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002459 porosimetry Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000013074 reference sample Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- ZMESHQOXZMOOQQ-UHFFFAOYSA-N 1-(naphthalen-1-ylmethyl)naphthalene Chemical compound C1=CC=C2C(CC=3C4=CC=CC=C4C=CC=3)=CC=CC2=C1 ZMESHQOXZMOOQQ-UHFFFAOYSA-N 0.000 description 1
- 206010053567 Coagulopathies Diseases 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000035602 clotting Effects 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 1
- 239000004137 magnesium phosphate Substances 0.000 description 1
- 229960002261 magnesium phosphate Drugs 0.000 description 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 1
- 235000010994 magnesium phosphates Nutrition 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 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
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000011374 ultra-high-performance concrete Substances 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 230000003313 weakening effect Effects 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
- C04B28/02—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
- C04B28/06—Aluminous cements
-
- 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)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a sulfoaluminate cement repair material and a preparation method thereof, belonging to the technical field of cement additives. The mass ratio of the sulfoaluminate cement to the ultrafine powder in the sulfoaluminate cement repair material is (7-9) to (1-3), and the sodium gluconate accounts for 0.05-0.25% of the total mass of the sulfoaluminate cement and the ultrafine powder. The invention utilizes superfine powder, sulphoaluminate cement and sodium gluconate powder material to form micro-grade effect, improves the compactness of the silicon-aluminum repair material, promotes the continuous increase of the cement strength in the later period, uses sodium gluconate to adjust the reaction speed of the sulphoaluminate cement, uses the superfine powder to improve the strength of the cement and the setting time of the sulphoaluminate cement, adjusts the setting time of the sulphoaluminate cement by adjusting the mixing amount of the superfine powder and the sodium gluconate, and realizes further regulation and control, thereby leading the use scene of the silicon-aluminum cement-based repair material to be more diversified.
Description
Technical Field
The invention belongs to the technical field of cement additives, and particularly relates to a sulfoaluminate cement repair material and a preparation method thereof.
Background
Cement mortar and concrete have been widely used worldwide due to their excellent mechanical properties and durability. Since the last century, mortar and concrete infrastructure has evolved considerably worldwide. However, the building structure is exposed to the natural environment for a long time, and is subject to the erosion of severe environment and the action of mechanical external force, so that local damage phenomenon is easy to occur, the erosion damage is accelerated, and the service life of the building structure is reduced. To avoid further development of structural failure, it is common practice to remove the damaged portion and repair and reinforce it with repair materials.
At present, the important point of research in the field of repair and protection is the repair and reinforcement of urban buildings such as important infrastructure, and in recent years, along with the development of economic construction, a great number of building structures inevitably generate structural failure phenomenon due to the increase of service time, and the service life of the building structures is shortened. However, the repairing and reinforcing of the existing building structures of villages and towns such as masonry structures, brick-concrete structures and low-grade concrete structures (less than or equal to C30) are not paid attention to, a large number of building structures need to be repaired and reinforced, and the required amount of repairing materials is large and can be known.
Therefore, the repair material suitable for the existing buildings in villages and towns has great market demands. The repair materials commonly used in the market at present mainly comprise: (1) Polymer repairing materials, commonly known are high molecular resin polymers such as epoxy resin, polyester resin and the like; (2) Cement-based repairing materials using special cement such as sulphoaluminate cement, magnesium phosphate cement and the like as main cementing materials. Compared with expensive polymer repairing materials, the special cement repairing materials are widely applied due to the characteristics of low price, excellent performance, good compatibility with matrix structures such as mortar, concrete and the like. Unlike flexible pavement, once local damage occurs to the cement concrete pavement, if not handled in time, very serious consequences can be caused, resulting in great economic and social losses.
Wherein the calcining temperature required by the production of the sulphoaluminate cement is low, the required calcareous raw material is less, and the CO is the same as that of the sulphoaluminate cement 2 The discharge amount can be reduced by 50-85%, and the sulphoaluminate cement has the excellent characteristics of quick solidification, quick development of early strength, freezing resistance, low shrinkage or micro expansion, corrosion resistance and the like, and is widely applied to the special fields of road repair, high-altitude cold environment construction, rush repair and rush construction, seawater corrosion resistance, ultra-high performance concrete and the like. Although the sulphoaluminate cement has been used in the building for many years, the sulphoaluminate cement has a plurality of problems such as higher raw material cost, inverted shrinkage of later strength, concentrated hydration heat release, difficult regulation and control of setting time, poor compatibility with additives and the like, and the problems restrict the wide use of the sulphoaluminate cement in the practical engineering field to a certain extent.
For example, patent application No. 201510475045.9 proposes a retarder suitable for sulphoaluminate cement, which consists of the following raw materials in parts by weight: 7-60 parts of urea, 3-11 parts of sodium lignin sulfonate, 2-7 parts of dinaphthyl methane disulfonate, 2-5 parts of water reducer and 30-70 parts of vermiculite, wherein the retarder can effectively delay the setting speed of the sulphoaluminate cement, remarkably improve the fluidity of the sulphoaluminate cement slurry, reduce the water demand of the sulphoaluminate cement during mixing, but has higher raw material cost in the preparation process. The patent of application number 201711440073.2 proposes a retarder suitable for sulphoaluminate cement, the initial setting time of the manufactured sulphoaluminate cement retarder can be prolonged to 76min, the final setting time is 103min, but the setting time still does not meet the requirements, and the like.
The superfine mineral additive is superfine powder with high volcanic ash activity, and is named as superfine powder. After the material is made into superfine powder by superfine process, besides possessing huge specific surface area and surface energy, its mechanical, thermodynamic and surface and interface characteristics can be changed, and when it is mixed into material, it can produce unexpected effect. Based on the above, the invention provides a novel sulphoaluminate cement coagulant.
Disclosure of Invention
In order to solve the technical problems, the invention provides a sulfoaluminate cement repair material and a preparation method thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
according to one of the technical schemes of the invention, the sulfoaluminate cement repair material comprises sulfoaluminate cement, sodium gluconate and ultrafine powder, wherein the mass ratio of the sulfoaluminate cement to the ultrafine powder is (7-9) to (1-3), and the sodium gluconate accounts for 0.05% -0.25% of the total mass of the sulfoaluminate cement and the ultrafine powder.
Further, the mass ratio of the sulphoaluminate cement to the ultrafine powder is 7:3, and the sodium gluconate accounts for 0.25% of the total mass of the sulphoaluminate cement and the ultrafine powder.
Further, the raw materials of the sulfoaluminate cement repair material also comprise water, and the water consumption is 50% of the total mass of the sulfoaluminate cement and the superfine powder.
Further, the specific surface area of the superfine powder is 700-900m 2 Per kg, the median diameter is less than or equal to 5 mu m.
Further, the components of the superfine powder comprise CaO and SiO 2 、Al 2 O 3 、Fe 2 O 3 、SO 3 、MgO、TiO 2 、P 2 O 5 、K 2 O and Na 2 O。
Further, the raw materials of the superfine powder comprise mineral powder, fly ash and gypsum.
Further, the preparation method of the superfine powder is a ball mill superfine powder grinding and winnowing process, and specifically comprises the following steps: conveying raw material mineral powder, fly ash and gypsum into a superfine ball mill by a lifter for grinding, wherein a dust collector is arranged at an outlet of the superfine ball mill to collect dust at a dust raising position; the ground materials are sent to a powder selecting machine by a lifter for powder selecting, and the specific surface area is 700-900m 2 Collecting/kg of superfine powder by powder collector, and passing through airThe chute is sent to a finished product elevator for warehousing; the unqualified fine powder returns to the inlet of the superfine ball mill from the outlet at the bottom of the powder concentrator through an air chute and reenters the ball mill for grinding until the powder is qualified superfine powder.
The second technical scheme of the invention is that the preparation method of the sulfoaluminate cement repair material comprises the following steps:
weighing the required sulphoaluminate cement, sodium gluconate, superfine powder and water according to the mass ratio, dissolving the sodium gluconate with water to obtain sodium gluconate solution, uniformly mixing the superfine powder and the sulphoaluminate cement, adding the mixture into the sodium gluconate solution, and uniformly stirring to obtain the sulphoaluminate cement repair material.
The sulfoaluminate cement repairing material disclosed by the invention takes the sulfoaluminate cement as a main component, sodium gluconate is used for adjusting the reaction speed of the sulfoaluminate cement, and ultrafine powder is used for improving the strength of the cement and the setting time of the sulfoaluminate cement. The invention aims at reducing the preparation cost of the silica-alumina cement-based repair mortar and improving the setting time of the repair material, and takes the ultrafine powder as an additive to prepare the repair material with adjustable setting time, and compared with the prior art, the invention has the following advantages and technical effects:
(1) According to the invention, the superfine powder and the sulphoaluminate cement are mixed again according to different proportions, and the setting time of the sulphoaluminate cement is regulated by regulating the mixing amount of the superfine powder and the sodium gluconate, so that the further regulation and control are realized, and the use scene of the silica-alumina cement-based repair material is more diversified.
(2) The superfine powder prepared by controlling the technical parameters of the mill and the proportion of raw materials has the characteristic of adjustable fineness, can realize the efficient industrialized production of the superfine powder, and reduces the preparation cost of the repair material.
(3) The ultrafine powder particle size of the sulfoaluminate cement setting agent raw material is in the micron order, the specific surface area is high, the ultrafine powder particle size can form a micro-grade matching effect with the sulfoaluminate cement, the structure of the silica-alumina cement-based repair material is improved, the compactness and uniformity of the repair material are improved, and the workability and the water retention of the repair mortar are improved.
(4) The superfine powder has high volcanic ash activity, can perform secondary chemical reaction with cement hydration products, has low hydration heat release, improves the hydration degree of cement stones, and promotes the later-stage continuous increase of cement strength.
(5) The invention utilizes superfine powder, sulphoaluminate cement and sodium gluconate powder material to form micro-grade matching effect, improves the compactness and uniformity of the silicon-aluminum repair material, reduces the porosity of the repair mortar, and improves the microstructure of the repair mortar; the hydration heat release is low; the superfine powder and the hydration product of the aluminum sulfate cement can be subjected to secondary chemical reaction, so that the hydration degree of the cement stone is improved, and the later-stage continuous increase of the cement strength is promoted; the superfine powder has the particle size reaching submicron level, high specific surface area, better water retention property and homogeneity, no segregation or water seepage and improved construction performance of the sulfur-aluminum cement mortar repair material.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
FIG. 1 is a time-comparison bar graph of initial and final set of each sample prepared in the examples;
FIG. 2 is an SEM micro-morphology map of a raw material sulphoaluminate cement at 5000 times magnification;
FIG. 3 is an SEM microtopography at 1000 Xmagnification of a raw material sulphoaluminate cement;
FIG. 4 is an SEM microtopography of a raw material micropowder at 5000 Xmagnification;
FIG. 5 is an SEM microtopography of the feedstock micropowder at 1000 Xmagnification;
FIG. 6 is a graph of particle size distribution of a raw material sulphoaluminate cement;
FIG. 7 is a graph showing the particle size distribution of the raw material ultra-fine powder;
FIG. 8 is a graph showing the results of the porosimetry of the repair materials 28d of samples 7, 8, 10 and 11 prepared in the examples;
FIG. 9 is a graph showing the results of measurement of the effect of the samples prepared in examples 13 to 16 on the cement hydration exotherm (a) and the hydration exotherm rate (b);
FIG. 10 shows the results of measuring the compressive strength of the repair materials of samples 7, 8, 10 and 11 prepared in the examples.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples of the present invention are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The process of the present invention examples and performance tests were all performed in the university of jersey laboratory.
The cement used in the embodiment of the invention is sulphoaluminate cement specified in Chinese national standard GB/T37125-2018.
The superfine powder raw materials used in the embodiment of the invention comprise mineral powder, fly ash and gypsum, and are produced by institutions belonging to the university of Jinan and have specific surface area of 700-900m 2 Per kg, the median diameter is less than or equal to 5 mu m. The mass percentages of the ultrafine powder components used in the embodiment of the invention are shown in the table 1:
TABLE 1 superfine powder component mass percent
The parts used in the examples of the present invention are parts by weight unless otherwise specified.
The technical scheme of the invention is further described by the following examples.
Example 1
Weighing 300 parts of sulphoaluminate cement and 150 parts of water according to parts by weight;
pouring the sulphoaluminate cement and water into a stirrer, stirring at a constant speed of 2000r/min for 60s, and immediately pouring out after uniform mixing to obtain a sulphoaluminate cement reference sample, wherein the sample number is 1.
Example 2
Weighing 300 parts of sulphoaluminate cement, 150 parts of water and 0.15 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker and stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring the sodium gluconate solution and the sulphoaluminate cement into a stirrer, stirring at a constant speed of 2000r/min for 60s, and immediately pouring out the mixture after uniform mixing to obtain a sulphoaluminate cement reference sample No. 2.
Example 3
Weighing 270 parts of sulphoaluminate cement, 150 parts of water, 30 parts of ultrafine powder and 0.15 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker for stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring ultrafine powder and aluminum sulfate cement into a stirrer, uniformly stirring at 2000r/min for 10s, adding the sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, immediately pouring out after uniform mixing to obtain the aluminum sulfate cement repair material, and sample number 3.
Example 4
Weighing 240 parts of sulphoaluminate cement, 150 parts of water, 60 parts of ultrafine powder and 0.15 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker for stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring ultrafine powder and aluminum sulfate cement into a stirrer, uniformly stirring at 2000r/min for 10s, adding the sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, immediately pouring out after uniform mixing to obtain the aluminum sulfate cement repair material, and sample number 4.
Example 5
Weighing 210 parts of sulphoaluminate cement, 150 parts of water, 90 parts of ultrafine powder and 0.15 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker for stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring ultrafine powder and aluminum sulfate cement into a stirrer, uniformly stirring at 2000r/min for 10s, adding the sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, immediately pouring out after uniform mixing to obtain the aluminum sulfate cement repair material, and sample number 5.
Example 6
Weighing 300 parts of sulphoaluminate cement, 150 parts of water and 0.3 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker for stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring ultrafine powder and aluminum sulfate cement into a stirrer, uniformly stirring at 2000r/min for 10s, adding the sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, immediately pouring out after uniform mixing to obtain the aluminum sulfate cement repair material, and sample number 6.
Example 7
Weighing 300 parts of sulphoaluminate cement, 150 parts of water and 0.45 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker for stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring ultrafine powder and aluminum sulfate cement into a stirrer, uniformly stirring at 2000r/min for 10s, adding the sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, immediately pouring out after uniform mixing to obtain the aluminum sulfate cement repair material, and sample number 7.
Example 8
Weighing 270 parts of sulphoaluminate cement, 150 parts of water, 30 parts of ultrafine powder and 0.45 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker for stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring ultrafine powder and aluminum sulfate cement into a stirrer, uniformly stirring at 2000r/min for 10s, adding the sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, immediately pouring out after uniform mixing to obtain the aluminum sulfate cement repair material, and sample number 8.
Example 9
Weighing 240 parts of sulphoaluminate cement, 150 parts of water, 60 parts of ultrafine powder and 0.45 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker for stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring ultrafine powder and aluminum sulfate cement into a stirrer, uniformly stirring at 2000r/min for 10s, adding the sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, immediately pouring out after uniform mixing to obtain the aluminum sulfate cement repair material, and sample number 9.
Example 10
Weighing 240 parts of sulphoaluminate cement, 150 parts of water, 60 parts of ultrafine powder and 0.6 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker for stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring ultrafine powder and aluminum sulfate cement into a stirrer, uniformly stirring at 2000r/min for 10s, adding the sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, and immediately pouring out after uniform mixing to obtain the aluminum sulfate cement repair material, wherein the sample number is 10.
Example 11
Weighing 210 parts of sulphoaluminate cement, 150 parts of water, 90 parts of ultrafine powder and 0.6 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker for stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring ultrafine powder and aluminum sulfate cement into a stirrer, uniformly stirring at 2000r/min for 10s, adding the sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, immediately pouring out after uniform mixing to obtain the aluminum sulfate cement repair material, and sample number 11.
Example 12
Weighing 210 parts of sulphoaluminate cement, 150 parts of water, 90 parts of ultrafine powder and 0.75 part of sodium gluconate according to parts by weight;
pouring sodium gluconate and water into a beaker for stirring until the sodium gluconate is completely melted to obtain sodium gluconate solution, pouring ultrafine powder and aluminum sulfate cement into a stirrer, uniformly stirring at 2000r/min for 10s, adding the sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, immediately pouring out after uniform mixing to obtain the aluminum sulfate cement repair material, and sample number 12.
Example 13
Weighing 100 parts of ordinary Portland cement and 50 parts of water according to parts by weight;
pouring ordinary Portland cement into a stirrer, stirring at a constant speed of 2000r/min for 10s, adding sodium gluconate solution after stirring uniformly, stirring at a constant speed for 60s by the stirrer, pouring out immediately after mixing uniformly, and obtaining Portland cement paste, sample No. 13.
Example 14
Weighing 90 parts of sulphoaluminate cement, 50 parts of water and 10 parts of ultrafine powder according to parts by weight;
pouring ordinary Portland cement and superfine powder into a stirrer, uniformly stirring at 2000r/min for 10s, adding sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, and immediately pouring out after uniform mixing to obtain Portland cement paste, wherein the sample is No. 14.
Example 15
Weighing 80 parts of sulphoaluminate cement, 50 parts of water and 20 parts of ultrafine powder according to parts by weight;
pouring ordinary Portland cement and superfine powder into a stirrer, uniformly stirring at 2000r/min for 10s, adding sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, immediately pouring out after uniform mixing, and obtaining Portland cement paste, sample number 15.
Example 16
Weighing 70 parts of sulphoaluminate cement, 50 parts of water and 30 parts of ultrafine powder according to parts by weight;
pouring ordinary Portland cement and superfine powder into a stirrer, uniformly stirring at 2000r/min for 10s, adding sodium gluconate solution after uniform stirring, uniformly stirring for 60s by the stirrer, and immediately pouring out after uniform mixing to obtain Portland cement paste, wherein the sample is No. 16.
Performance testing
1. Initial setting time and final setting time
The initial setting time and final setting time of samples 1-12 were determined according to the method in GB/T1346-2001 method for testing Water, setting time and stability for Cement Standard consistencies, the results are shown in Table 2, and the time-versus-column for initial and final setting of each sample is shown in FIG. 1.
TABLE 2 initial set time and final set time for samples 1-12
As can be seen from table 2 and fig. 1, sample 1 was free of sodium gluconate and ultrafine powder and had a short clotting time; comparing samples 2, 6 and 7, the fact that the setting time of the sulphoaluminate cement is gradually increased along with the increase of the dosage of the sodium gluconate shows that the sodium gluconate has obvious retarding effect on the sulphoaluminate cement; under the condition of adding sodium gluconate with the same mixing amount, samples 2, 3 and 4 gradually reduce the setting time of the sulphoaluminate cement along with the increase of the mixing amount of the ultrafine powder, which shows that the setting time of the ultrafine powder on the sulphoaluminate cement is a promoting effect.
The setting time of the sulphoaluminate cement, such as samples 8, 9, 10, 11 and 12, is adjusted by adjusting the mixing amount of the ultrafine powder and the sodium gluconate. In the actual construction process, aiming at different construction requirements and construction environments, the coagulation time of the cement-based repairing material can be adjusted by adjusting and doping sodium gluconate and superfine powder in different proportions, so that the use scene of the silica-alumina cement-based repairing material is more diversified.
2. SEM test
SEM tests were performed on the raw material sulfoaluminate cement and the ultra-fine powder used in the preparation process of each example, and the test results are shown in fig. 2 to 5, wherein fig. 2 and 3 are SEM micro-morphology graphs of the raw material sulfoaluminate cement at 5000 times and 1000 times, respectively, and fig. 4 and 5 are SEM micro-morphology graphs of the raw material ultra-fine powder at 5000 times and 1000 times, respectively.
As can be seen from fig. 2 to 5, the particle size of the ultra-fine powder is smaller than that of the sulphoaluminate cement.
3. Particle size distribution test
Particle size distribution tests were performed on the raw material sulfoaluminate cement and the ultra-fine powder used in the preparation process of each example, fig. 6 is a graph of particle size distribution of the raw material sulfoaluminate cement, and fig. 7 is a graph of particle size distribution of the raw material ultra-fine powder.
As can be seen from fig. 6 and 7, the particle size of the ultrafine powder is far smaller than that of the sulphoaluminate cement, so that on one hand, the self compact filling effect can be exerted, the particle size distribution of the repair material is optimized, and the self porosity of the repair material is reduced; on the other hand, the filling water in the pores of the repairing material can be replaced by the superfine mineral admixture, and the replaced free water can increase the thickness of the lubricating layer on the surfaces of the raw material particles of the repairing material, so that the workability of the repairing material is improved.
4. Porosity of the porous material
There is a close relationship between the pore structure and the strength and durability of the repair material. The results of the porosimetry of the repair materials 28d of the samples 7, 8, 10 and 11 prepared in the examples were measured by the mercury intrusion test method, as shown in fig. 8. As can be seen from fig. 8, in the sample cured 28d, as the amount of the ultrafine mineral admixture increases, the total pore volume of the sample showed a tendency to decrease, and the porosities of samples 7, 8, 10 and 11 were 10.2%, 9.7%, 8.1% and 7.8%, respectively, and the total pore volume of the sample doped with the ultrafine mineral admixture was decreased by 0.5%, 2.1% and 2.4% with respect to sample 7, respectively.
5. Hydration exotherm
The effect of the samples prepared in examples 13 to 16 on the hydration heat release and the hydration heat release rate of cement was tested, and fig. 9 (a) shows the effect of the samples prepared in examples 13 to 16 on the hydration heat release of cement, and as shown in fig. 9 (a), the addition of the ultrafine mineral admixture reduced the hydration heat release of the cement-based material. When the mixing amount of the superfine mineral admixture is 20% (the proportion of the superfine powder to the total mass of the sulphoaluminate cement and the superfine powder), the hydration heat release amount of the sample is the lowest and is 203.68J/g. When the superfine mineral admixture was reduced to 10% or increased to 30%, the hydration heat release of the samples slightly increased, 221.79J/g, 211.32J/g respectively, but all lower than 234.85J/g of the blank. The reduction in hydration exotherm in sample 3d, spiked with the ultra-fine mineral blend, was 5.57%, 13.3% and 10.02% compared to the blank (example 13), respectively.
FIG. 9 (b) shows the effect of the samples prepared in examples 13 to 16 on the heat release rate of cement hydration, and as shown in FIG. 9 (b), the cement has three heat release peaks in early hydration, and the three heat release peaks are respectively a dissolution heat release peak, a silicon phase reaction peak and an aluminum phase reaction peak in order of appearance time. As can be seen from FIG. 9 (b), the addition of the ultra-fine fraction increases the hydration heat release rate of the cement, and shortens the interval between the silicon phase peak and the aluminum phase peak. The ultra-high specific surface area can provide nucleation sites for the generation of hydration products and promote the progress of cement hydration reaction. The appearance time of the aluminum phase reaction peak was advanced, compared with the blank (example 13), when the aluminum phase reaction peak appearedThe interval is most rapidly advanced by about 1h, and the aluminum phase reaction peak-to-peak height increases. The aluminum phase part in the superfine fraction participates in the reaction, and the active silicon and the C-S-H gel generated by the reaction of the active aluminum and the calcium hydroxide in the superfine fraction can adsorb sulfate ions in the system, thereby promoting C 3 The hydration reaction of A increases the peak height of the aluminum phase reaction peak. The peak height of the silicon phase reaction peak is reduced, the peak clipping phenomenon occurs, the occurrence time of the silicon phase reaction peak is delayed, the addition of the superfine mineral admixture leads to the reduction of the cement dosage, the reduction of the silicon phase content in the system, and the weakening of the peak height.
6. Compressive Strength
The compressive strength of the repair materials of samples 7, 8, 10 and 11 prepared in examples was tested, and the test results are shown in fig. 10. As shown in FIG. 10, in comparison with 7, 8, 10 and 11, the strength of the ultrafine powder to the sulfur-aluminum cement mortar is obviously improved, and the strength of the ultrafine powder to the repair mortar with the mixing amount of 30% is maximally improved.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. The sulfoaluminate cement repairing material is characterized by comprising sulfoaluminate cement, sodium gluconate and superfine powder, wherein the weight ratio of the sulfoaluminate cement to the superfine powder is (7-9) to (1-3), and the sodium gluconate accounts for 0.05-0.25% of the total weight of the sulfoaluminate cement and the superfine powder.
2. The sulfoaluminate cement repair material according to claim 1, wherein the mass ratio of the sulfoaluminate cement to the ultra-fine powder is 7:3, and the sodium gluconate accounts for 0.25% of the total mass of the sulfoaluminate cement and the ultra-fine powder.
3. The sulfoaluminate cement repair material according to claim 1, wherein the raw material further comprises water in an amount of 50% of the total mass of the sulfoaluminate cement and the ultra-fine powder.
4. The sulfoaluminate cement repair material according to claim 1, wherein the specific surface area of the ultra-fine powder is 700-900m 2 Per kg, the median diameter is less than or equal to 5 mu m.
5. The sulfoaluminate cement repair material according to claim 3, wherein the ultra-fine powder comprises CaO, siO 2 、Al 2 O 3 、Fe 2 O 3 、SO 3 、MgO、TiO 2 、P 2 O 5 、K 2 O and Na 2 O。
6. The sulfoaluminate cement repair material according to claim 3, wherein the raw materials of the ultra-fine powder include mineral powder, fly ash and gypsum.
7. A method of preparing the sulfoaluminate cement repair material of any one of claims 1 to 6, comprising the steps of:
weighing the required sulphoaluminate cement, sodium gluconate, superfine powder and water according to the mass ratio, dissolving the sodium gluconate with water to obtain sodium gluconate solution, uniformly mixing the superfine powder and the sulphoaluminate cement, adding the mixture into the sodium gluconate solution, and uniformly stirring to obtain the sulphoaluminate cement repair material.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103288372A (en) * | 2013-04-09 | 2013-09-11 | 宁波大学 | Composite thickening time control agent capable of improving working performance of sulphoaluminate cement and application thereof |
| CN110746165A (en) * | 2019-11-14 | 2020-02-04 | 广西云燕特种水泥建材有限公司 | Ocean engineering repair mortar and preparation method thereof |
| CN112851185A (en) * | 2021-02-01 | 2021-05-28 | 重庆大学 | Retarder for adjusting initial setting time of sulphoaluminate cement and preparation method and use method thereof |
| CN114507055A (en) * | 2022-03-07 | 2022-05-17 | 西安建筑科技大学 | High-permeability blended hydraulic lime repair slurry prepared from superfine volcanic ash powder |
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2023
- 2023-09-11 CN CN202311166811.4A patent/CN117361988A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103288372A (en) * | 2013-04-09 | 2013-09-11 | 宁波大学 | Composite thickening time control agent capable of improving working performance of sulphoaluminate cement and application thereof |
| CN110746165A (en) * | 2019-11-14 | 2020-02-04 | 广西云燕特种水泥建材有限公司 | Ocean engineering repair mortar and preparation method thereof |
| CN112851185A (en) * | 2021-02-01 | 2021-05-28 | 重庆大学 | Retarder for adjusting initial setting time of sulphoaluminate cement and preparation method and use method thereof |
| CN114507055A (en) * | 2022-03-07 | 2022-05-17 | 西安建筑科技大学 | High-permeability blended hydraulic lime repair slurry prepared from superfine volcanic ash powder |
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