CN112759306A - Fly ash-based chlorine salt resistant mortar and preparation method thereof - Google Patents
Fly ash-based chlorine salt resistant mortar and preparation method thereof Download PDFInfo
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- CN112759306A CN112759306A CN202011625326.5A CN202011625326A CN112759306A CN 112759306 A CN112759306 A CN 112759306A CN 202011625326 A CN202011625326 A CN 202011625326A CN 112759306 A CN112759306 A CN 112759306A
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- fly ash
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 63
- 239000010881 fly ash Substances 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 125000001309 chloro group Chemical class Cl* 0.000 title 1
- 239000004113 Sepiolite Substances 0.000 claims abstract description 47
- 229910052624 sepiolite Inorganic materials 0.000 claims abstract description 47
- 235000019355 sepiolite Nutrition 0.000 claims abstract description 47
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 239000004568 cement Substances 0.000 claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004576 sand Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000008030 superplasticizer Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 5
- 238000007580 dry-mixing Methods 0.000 claims abstract description 3
- 238000005260 corrosion Methods 0.000 claims description 20
- 230000007797 corrosion Effects 0.000 claims description 20
- 150000001804 chlorine Chemical class 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- 230000003628 erosive effect Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 3
- 239000010883 coal ash Substances 0.000 claims 1
- 238000005457 optimization Methods 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 2
- -1 by mass Substances 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
- C04B14/042—Magnesium silicates, e.g. talc, sepiolite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a fly ash-based anti-chloride mortar and a preparation method thereof, wherein the mortar is prepared from the following raw materials, by mass, cement, sand, fly ash, sepiolite and water; firstly, determining the optimal mixing amount of the fly ash; secondly, selecting the optimum blending amount of the fly ash as a fixed value, blending different parts of sepiolite, and obtaining the optimum blending amount of the sepiolite through performance optimization, wherein the proportion of other components of the mortar is unchanged; weighing a certain amount of cement, fly ash and sepiolite, and uniformly mixing, wherein the method comprises the steps of putting the powder into a mortar stirring pot for dry-mixing and pre-homogenizing; adding the sand into a stirring pot for pre-mixing; finally, water is added, and a superplasticizer is adopted to adjust the state of the mortar. And after the adjustment is finished, forming, removing the mold, and putting into a standard curing room for curing.
Description
Technical Field
The method relates to raw materials such as fly ash, iron powder, sepiolite and the like, and can effectively improve the chlorine salt corrosion resistance of the mortar through the optimization of the proportion and the preparation method.
Background
With the mass construction of civil engineering, the domestic infrastructure has been greatly improved. The service environment of different projects determines the required cement-based material properties. The chlorine salt corrosion resistance of seaport engineering and the like is high, and the chlorine salt corrosion resistance of the fly ash can be effectively improved by doping the fly ash, but due to the non-uniform quality of the fly ash and the limitation of yield, the construction of related engineering is seriously affected. Therefore, the development of a new admixture capable of effectively improving the chlorine salt corrosion resistance of the cement-based material has important significance. The invention introduces sepiolite on the basis of fly ash, provides a preparation method of chloride corrosion resistant mortar, obtains better chloride corrosion resistant effect, and further improves the chloride corrosion resistant performance of cement-based materials.
Disclosure of Invention
The invention adopts materials such as fly ash, cement, sepiolite, sand, water, superplasticizer and the like, and improves the strength of the mortar and the comprehensive performance of the mortar while improving the chlorine salt corrosion resistance of the mortar by optimizing the experimental matching ratio and the operation flow.
The invention adopts the following technical scheme:
the invention discloses a fly ash-based chlorine salt corrosion resistant mortar, which is prepared from 16-22 parts of cement by mass; sand: 63-67 parts; fly ash: 1-7 parts; sepiolite: 1-6 parts; water: 10-11 parts; a superplasticizer: 0.3-1.93% of the total amount of the cementing material (mortar).
A preparation method of fly ash-based chlorine salt corrosion resistant mortar comprises the following steps: (1) determining the optimal proportion of materials: firstly, determining the optimal mixing amount of the fly ash; secondly, selecting the optimum blending amount of the fly ash as a fixed value, blending different parts of sepiolite, and obtaining the optimum blending amount of the sepiolite through performance optimization, wherein the proportion of other components of the mortar is unchanged; (2) mixing and forming: firstly, weighing a certain amount of cement, fly ash and sepiolite and uniformly mixing, wherein the method comprises the steps of putting the powder into a mortar stirring pot for dry-mixing and pre-homogenizing for 120 s; then, adding the sand into a stirring pot for premixing for 120 s; finally, water is added, and a superplasticizer is adopted to adjust the state of the mortar. (3) And after the adjustment is finished, forming, removing the mold, and putting into a standard curing room for curing.
Optimizing the material proportion: the proportion is developed by taking mortar as an example, and the water-cement ratio is set to be 0.5. The technology mainly comprises the obtaining of the optimal mixing amount of the fly ash and the sepiolite base. Firstly, the optimization of the fly ash and the sepiolite is carried out, and then, the research of the compound doping of the fly ash and the sepiolite is carried out. Wherein, the optimal mixing amount of the fly ash is fixed, so as to further analyze the influence rule of different mixing amounts of sepiolite on the mortar strength and the anti-chloride ion erosion performance. Finally obtaining the optimal proportion of the sepiolite to the fly ash.
Forming and maintaining: firstly, weighing a certain amount of cement, fly ash and sepiolite, and uniformly mixing, wherein the method comprises the steps of putting the powder into a mortar stirring pot, and pre-stirring for 120 s; then, pre-mixing the mixture in a sand stirring pot for 120 s; finally, water is added, and a superplasticizer is adopted to adjust the state of the mortar. And after the adjustment is finished, forming, removing the mold, putting into a standard curing room, and curing at different ages.
And (3) testing the strength: the mortar samples under different working conditions are subjected to strength test according to the specification GBT 17671-1999 Cement mortar Strength test method (ISO method).
Chloride ion performance: the mortar samples under different working conditions are tested according to the standard JTJ270-1998 concrete test rule of water transportation engineering.
The fly ash-based anti-chlorine salt erosion mortar is especially a building material necessary for engineering with chlorine salt erosion working condition. The industrial waste fly ash is added to improve the chlorine salt corrosion resistance of the mortar, and the mineral sepiolite is further introduced into the cement base case, so that the chlorine salt corrosion resistance of the mortar is further enhanced. The development of the mortar can improve the durability of the mortar, further reduce the consumption of cement in the mortar, and has important practical significance for recycling minerals and industrial wastes. The sepiolite and the fly ash are mixed, so that the component proportion of the mortar is changed, and the chlorine salt corrosion resistance of the mortar is improved. The synergistic action mechanism of the fly ash and the sepiolite is considered, the gradual optimization of the double systems is realized, and the durability of the cement-based composite material is greatly improved. Under the condition of improving the chlorine salt corrosion resistance of the mortar, the strength of the mortar is further improved, and the comprehensive performance of the mortar is improved.
Drawings
FIG. 1 is a micro-topography of fly ash/sepiolite, (a) micro-topography of sepiolite; (b) micro-morphology of fly ash.
FIG. 2 is a flow chart of a fly ash/sepiolite mortar molding process.
FIG. 3 strength of the chlorine salt resistant mortar (a) effect of single sepiolite on mortar strength; b) the influence of the single-doped fly ash on the mortar strength.
FIG. 4 shows the effect of the fly ash/sepiolite complex doping on mortar strength and chlorine salt erosion resistance; (a) the influence of the compound doping on the mortar strength; (b) the influence of the compound doping on the anti-chlorine salt erosion performance of the mortar.
Detailed Description
The sepiolite has stronger adsorption performance, so that the sepiolite has greater potential when the sepiolite prevents chloride ions from permeating into the cement-based material. If the sepiolite can improve the chloride ion corrosion resistance of the cement-based material to a greater extent, the application range of the sepiolite can be expanded, and the service life of the cement-based structural material can be prolonged to a certain extent.
Sepiolite, as a mineral material, has water-absorbing properties, is microscopically fibrous, has a rough surface, and adversely affects the workability of cement-based materials. The fly ash obviously improves the workability of mortar due to the good morphological effect of the fly ash, but at present, the combination of the fly ash and the fly ash is rarely studied to improve the anti-chloride ion corrosion performance of a cement-based material. Through the system design, the following ratios are given. Shown in tables 1 and 2:
TABLE 1 fly ash and sepiolite Single blend design
TABLE 2 fly ash and sepiolite compounding ratio design
As seen from the figure 3, the addition of the fly ash affects the strength of the mortar to a certain extent, and basically has a descending trend, and the addition and the strength factor are comprehensively considered, so that the fly ash has a better effect when the addition is 20%; as can be seen from FIG. 4, the composite doping of the fly ash and the sepiolite significantly improves the compressive strength of the mortar, and particularly, when 20% of the fly ash and 20% of the sepiolite are doped, the chloride ion erosion resistance of the mortar can be significantly improved.
Analysis of examples
As can be seen from Table 2, the fly ash and the sepiolite are added into the mortar in a complex mixing manner, so that the chloride ion corrosion resistance of the mortar can be effectively improved. The expansion degree reaches more than 180 multiplied by 185mm, the compressive strength (56day) can be more than 45MPa, the maximum strength is 53MPa, the strength of the mortar is ensured, the chloride ion corrosion resistance of the mortar is further improved, and the chloride ion diffusion coefficient can be improved by 69.6 percent when the mortar is optimally doped.
Therefore, through systematic research, the proportion of each component of the mortar is as follows:
16-22 parts of cement; sand: 63-67 parts; fly ash: 1-7 parts; sepiolite: 1-6 parts; water: 10-11 parts; a superplasticizer: 0.3 to 1.93 percent of the total amount of the cementing material.
Claims (3)
1. A fly ash-based anti-chlorine salt erosion mortar is prepared from 16-22 parts of cement by mass; sand: 63-67 parts; fly ash: 1-7 parts; sepiolite: 1-6 parts; water: 10-11 parts; a superplasticizer: 0.3% -1.93% of the total amount of the cementing material, namely the mortar; the sum of all the components is one hundred percent.
2. A preparation method of fly ash-based chlorine salt corrosion resistant mortar is characterized by comprising the following steps: determining the optimal proportion of materials: firstly, determining the blending amount of the fly ash; secondly, selecting the coal ash doping amount as a fixed value, and doping different parts of sepiolite to obtain the doping amount of the sepiolite, wherein the proportion of other components of the mortar is unchanged;
mixing and forming: firstly, weighing a certain amount of cement, fly ash and sepiolite and uniformly mixing, wherein the method comprises the steps of putting the powder into a mortar stirring pot for dry-mixing and pre-homogenizing for 120 s; then, adding the sand into a stirring pot for premixing for 120 s; finally, adding water, and adjusting the state of the mortar by adopting a superplasticizer; (3) after the adjustment is finished, forming, removing the mold, and putting into a standard curing room for curing;
in the mortar, the water-cement ratio is set to be 0.5; the method comprises the steps of obtaining the optimal mixing amount of the fly ash and the sepiolite; firstly, optimizing the fly ash and the sepiolite, and then, researching the complex doping of the fly ash and the sepiolite; wherein, the optimal mixing amount of the fly ash is fixed, so as to analyze the influence rule of different mixing amounts of sepiolite on the mortar strength and the anti-chloride ion erosion performance; finally obtaining the optimal proportion of the sepiolite to the fly ash.
3. The preparation method of the fly ash-based chlorine salt corrosion resistant mortar according to claim 2, characterized by comprising the following steps: forming and maintaining: firstly, weighing a certain amount of cement, fly ash and sepiolite, and uniformly mixing, wherein the method comprises the steps of putting the powder into a mortar stirring pot, and pre-stirring for 120 s; then, pre-mixing the mixture in a sand stirring pot for 120 s; finally, adding water, and adjusting the state of the mortar by adopting a superplasticizer; and after the adjustment is finished, forming, removing the mold, putting into a standard curing room, and curing at different ages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011625326.5A CN112759306A (en) | 2020-12-31 | 2020-12-31 | Fly ash-based chlorine salt resistant mortar and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011625326.5A CN112759306A (en) | 2020-12-31 | 2020-12-31 | Fly ash-based chlorine salt resistant mortar and preparation method thereof |
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| CN112759306A true CN112759306A (en) | 2021-05-07 |
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| CN202011625326.5A Pending CN112759306A (en) | 2020-12-31 | 2020-12-31 | Fly ash-based chlorine salt resistant mortar and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115259738A (en) * | 2022-08-08 | 2022-11-01 | 广西南宁市邦华建材有限公司 | Special composite marine concrete anti-corrosion preservative and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106278059A (en) * | 2016-08-29 | 2017-01-04 | 石家庄铁道大学 | A kind of precenting chlorate corrosion mortar and preparation method thereof |
| CN110054452A (en) * | 2018-12-27 | 2019-07-26 | 中山大学 | A kind of seawater sea sand fire resisting corrosion resistant concrete and preparation method thereof |
| KR102158503B1 (en) * | 2020-02-11 | 2020-09-23 | 김종철 | Mortar composition for repair and reinforcement of concrete structure and repair and reinforcement method of concrete structure using same |
-
2020
- 2020-12-31 CN CN202011625326.5A patent/CN112759306A/en active Pending
Patent Citations (3)
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|---|---|---|---|---|
| CN106278059A (en) * | 2016-08-29 | 2017-01-04 | 石家庄铁道大学 | A kind of precenting chlorate corrosion mortar and preparation method thereof |
| CN110054452A (en) * | 2018-12-27 | 2019-07-26 | 中山大学 | A kind of seawater sea sand fire resisting corrosion resistant concrete and preparation method thereof |
| KR102158503B1 (en) * | 2020-02-11 | 2020-09-23 | 김종철 | Mortar composition for repair and reinforcement of concrete structure and repair and reinforcement method of concrete structure using same |
Non-Patent Citations (1)
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| 孙凯利等: "海泡石对砂浆抗氯离子和碳化侵蚀性能的影响", 《硅酸盐通报》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115259738A (en) * | 2022-08-08 | 2022-11-01 | 广西南宁市邦华建材有限公司 | Special composite marine concrete anti-corrosion preservative and preparation method thereof |
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Application publication date: 20210507 |