WO2021133353A2 - A method for increasing the electrical characteristics of high iron-contained calcium aluminate cements by hydrating under the magnetic field without any additives - Google Patents
A method for increasing the electrical characteristics of high iron-contained calcium aluminate cements by hydrating under the magnetic field without any additives Download PDFInfo
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- WO2021133353A2 WO2021133353A2 PCT/TR2020/051378 TR2020051378W WO2021133353A2 WO 2021133353 A2 WO2021133353 A2 WO 2021133353A2 TR 2020051378 W TR2020051378 W TR 2020051378W WO 2021133353 A2 WO2021133353 A2 WO 2021133353A2
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- WO
- WIPO (PCT)
- Prior art keywords
- magnetic field
- calcium aluminate
- under
- cement
- additives
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0003—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability making use of electric or wave energy or particle radiation
- C04B40/0007—Electric, magnetic or electromagnetic fields
-
- 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
-
- 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
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
Definitions
- the invention is about after the hydration process of CACs with high iron content (Calcium Aluminate Cement) is carried out under the magnetic field. And it is related with significantly increasing the conductivity without addition or without any doping contrary to what is known in the literature uses carbon nanotube (CN) and / or carbon fiber (CF) additive or another chemical to increase electrical conductivity in CAC materials.
- CN carbon nanotube
- CF carbon fiber
- CAC Calcium aluminate cement
- CN carbon nanotube
- CF carbon fiber
- the additives provides increase in the strength values, but also cause significant conductivity problems due to the formation of heterogeneous regions in the final product structure depending on the addition methods.
- the use of high amounts of additives also leads to decrease in compression strength values, which are the most important of the basic requirements provided by such cementitious materials, and the materials produced from such cements easily break during use.
- Our invention is aimed at increasing the electrical conductivity without adding CN and / or CF or any other chemicals or making any doping in order to increase the electrical conductivity in such materials, contrary to what is known in the literature, after the hydration process of CACs with high iron content is performed under magnetic field.
- CACs with high iron content is performed under magnetic field.
- CAC Calcium Aluminate Cement
- water and hydrated under magnetic field effect CA cement is a fast setting cement.
- CA cement is placed in a mold under magnetic field before it is mixed with water. This magnetic field is created by using magnets.
- the mixture was prepared by adding water in a ratio of 0.5 w / c (water / cement) into CA cement under the magnetic field. In this way, the mixture is left under the magnetic field from the first stage to the last stage of hydration. After the hydration and setting are completed, the solidified material in the mold is removed after approximately 1 hour. The obtained material is a CAC sample containing crystals oriented under magnetic field. Afterwards, mechanical (bending and compression strength tests in accordance with standards), microstructural (using optical microscope or electron microscope) and electrical (by conductivity measurement) characterization are performed in the direction where the magnetic field is applied.
- the electrical conductivity values of CACs with high iron content are surprisingly increased by using only the magnetic field effect without any additives.
- Ca 2+ , Al 3+ , Fe 2+ , O 2 and H + ions which are the basic ions in the structures of CACs and dissolved in the aqueous system, come together depending on time in the first stage of the hydration process.
- the solution can be achieved by obtaining the targeted high conductivity thanks to the microstructure, cavity, ionization and crystallization that increase the electrical conduction by forming oriented crystals under magnetic field effect.
- CAC phases with a crystal size between 0.0001 pm and 1000 pm were obtained in the structure by using optical microscope or electron microscope.
- the electrical conductivity values of CA cements whose electrical conductivity was increased by hydrating under magnetic field, were measured between 1 Hz - 5x10 3 kHz values were between 0.1 x 10 6 S / m and 1000 S / m, and the mechanical (compression strength value) tests were between 5 MPa and 65 MPa. has been seen.
- the density value is between 0.6 - 2.7 g / cm 3 and the pore ratio is between 0.5 - 15% by volume.
- This application can be preferred for areas intended for the production and application of different types of materials for high electrical conductivity or can form a basic step for such applications. It is possible to produce materials in different sizes and shapes for the purposes to be applied.
- the final product can be obtained by shaping between the plates that create magnetic fields according to the target material size or shape.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Inorganic Fibers (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The invention is about after the hydration process of CACs with high iron content (Calcium Aluminate Cement) is carried out under the magnetic field. And it is related with significantly increasing the conductivity without addition or without any doping contrary to what is known in the literature uses carbon nanotube (CN) and / or carbon fiber (CF) additive or another chemical to increase electrical conductivity in CAC materials.
Description
DESCRIPTION
INCREASING THE ELECTRICAL CHARACTERISTICS OF HIGH IRON- CONTAINED CALCIUM ALUMINATE CEMENTS BY HYDRATING UNDER THE MAGNETIC FIELD WITHOUT ANY ADDITIVES
TECHNICAL FIELD
The invention is about after the hydration process of CACs with high iron content (Calcium Aluminate Cement) is carried out under the magnetic field. And it is related with significantly increasing the conductivity without addition or without any doping contrary to what is known in the literature uses carbon nanotube (CN) and / or carbon fiber (CF) additive or another chemical to increase electrical conductivity in CAC materials.
PREVIOUS TECHNIQUE
Calcium aluminate cement (CAC) has a very limited electrical conductivity. Electrical conductivity values of cements are tried to be increased by the addition of additives with high electrical conductive materials such as carbon nanotube (CN), carbon fiber (CF). It is known that every addition made to improve the properties requires both additional costs and additional doping processes due to the use of such materials. In addition, the additives provides increase in the strength values, but also cause significant conductivity problems due to the formation of heterogeneous regions in the final product structure depending on the addition methods. Finally, it is known that the use of high amounts of additives also leads to decrease in compression strength values, which are the most important of the basic requirements provided by such cementitious materials, and the materials produced from such cements easily break during use.
When the state of the art was examined on cement hydration studies using magnetic fields, improvements on the effects of cement hydration have been made on the mechanical strength and setting time of cements, apart from the electrical conductivity. In addition, the effect between electrical conductivity and setting time and strength has been investigated. In cement-based materials, additives such as carbon nanotube (CN) and carbon fiber (CF) have been used to provide/increase the electrical conductivity. In addition, besides these additives,
the effects of materials such as water or plasticizers in systems modified with magnetic field was investigated instead of magnetic field effect on cement phases. However, it appears that electrical properties are not studied in similar systems. Although there are studies on calcium aluminate (CA) cements with low iron content, no research has been found in the literature to increase electrical conductivity in high iron content CACs.
BRIEF DESCRIPTION OF THE INVENTION
Our invention is aimed at increasing the electrical conductivity without adding CN and / or CF or any other chemicals or making any doping in order to increase the electrical conductivity in such materials, contrary to what is known in the literature, after the hydration process of CACs with high iron content is performed under magnetic field. Thus, unlike the known, low cost CAC product with high electrical conductivity is obtained directly and quickly without any additional processing.
DETAILED DESCRIPTION OF THE INVENTION
Within our invention, CAC (Calcium Aluminate Cement) is mixed with water and hydrated under magnetic field effect. CA cement is a fast setting cement. In this study, CA cement is placed in a mold under magnetic field before it is mixed with water. This magnetic field is created by using magnets. The mixture was prepared by adding water in a ratio of 0.5 w / c (water / cement) into CA cement under the magnetic field. In this way, the mixture is left under the magnetic field from the first stage to the last stage of hydration. After the hydration and setting are completed, the solidified material in the mold is removed after approximately 1 hour. The obtained material is a CAC sample containing crystals oriented under magnetic field. Afterwards, mechanical (bending and compression strength tests in accordance with standards), microstructural (using optical microscope or electron microscope) and electrical (by conductivity measurement) characterization are performed in the direction where the magnetic field is applied.
In our invention, the electrical conductivity values of CACs with high iron content (15-20%) are surprisingly increased by using only the magnetic field effect without any additives. Thus, with the magnetic field effect applied, Ca2+, Al3+, Fe2+, O2 and H+ ions, which are the basic ions in the structures of CACs and dissolved
in the aqueous system, come together depending on time in the first stage of the hydration process. The solution can be achieved by obtaining the targeted high conductivity thanks to the microstructure, cavity, ionization and crystallization that increase the electrical conduction by forming oriented crystals under magnetic field effect.
The steps of hydration method under magnetic field in order to increase the electrical properties of calcium aluminate cements with high iron content, which are the subject of our invention, are as follows;
- Putting Calcium Aluminate Cements in a mold under 0.1-10000 Gauss magnetic field created by using magnets before mixing with water,
- Preparing the mixture by adding water to the CA cement under the magnetic field with the water/cement ratio of 0.2-0.7,
- After the hydration and setting are completed, the solidified material in the mold is removed after 1-55 hours.
After examining the microstructures of CA cements whose electrical conductivity was increased by hydrating under magnetic field, it was observed that CAC phases with a crystal size between 0.0001 pm and 1000 pm were obtained in the structure by using optical microscope or electron microscope.
The electrical conductivity values of CA cements, whose electrical conductivity was increased by hydrating under magnetic field, were measured between 1 Hz - 5x103 kHz values were between 0.1 x 106 S / m and 1000 S / m, and the mechanical (compression strength value) tests were between 5 MPa and 65 MPa. has been seen. In addition, it has been determined that the density value is between 0.6 - 2.7 g / cm3 and the pore ratio is between 0.5 - 15% by volume.
This application can be preferred for areas intended for the production and application of different types of materials for high electrical conductivity or can form a basic step for such applications. It is possible to produce materials in different sizes and shapes for the purposes to be applied. The final product can be obtained by shaping between the plates that create magnetic fields according to the target material size or shape.
Claims
1. A method of hydrating under magnetic field in order to increase the electrical properties of calcium aluminate cements with high iron content without additives characterized by the steps below:
- Putting Calcium Aluminate Cements in a mold under 0.1-10000 Gauss magnetic field created with the help of magnets before mixing with water,
- Preparing the mixture by adding water to the CA cement under the magnetic field in a water / cement ratio of 0.2-0.7,
- removing the solidified material in the mold after the hydration and setting are completed, after being kept at +18 to +24 °C for a period of 1-55 hours.
2. It is CA cement whose electrical conductivity is increased by hydration under magnetic field characterized by its electrical conductivity values are between 0.1 x 106 S / m and 1000 S / m that measured between 1 Hz - 5x103 kHz, compression strength value between 5 MPa and 65 MPa, density value 0.6 - 2.7 g / cm3 and the pore ratio is between 0.5 - 15% by volume.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TR2019/21386A TR201921386A2 (en) | 2019-12-24 | 2019-12-24 | Increasing the electrical properties of calcium aluminate cements with high iron content without additives by hydrating them under magnetic field. |
| TR2019/21386 | 2019-12-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2021133353A2 true WO2021133353A2 (en) | 2021-07-01 |
| WO2021133353A3 WO2021133353A3 (en) | 2021-09-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/TR2020/051378 WO2021133353A2 (en) | 2019-12-24 | 2020-12-24 | A method for increasing the electrical characteristics of high iron-contained calcium aluminate cements by hydrating under the magnetic field without any additives |
Country Status (2)
| Country | Link |
|---|---|
| TR (1) | TR201921386A2 (en) |
| WO (1) | WO2021133353A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115504799A (en) * | 2022-09-09 | 2022-12-23 | 西安建筑科技大学 | Binding agent, C/SiC high-temperature wave-absorbing material and preparation method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1112014A (en) * | 1997-06-19 | 1999-01-19 | Sanyo Chem Ind Ltd | Cement composition |
| CN108117365B (en) * | 2017-12-27 | 2020-09-25 | 广州大学 | Method for producing conductive material and conductive material |
| CN109467382B (en) * | 2018-10-24 | 2021-05-04 | 武汉理工大学 | Based on gamma-C2S conductive material and preparation method thereof |
-
2019
- 2019-12-24 TR TR2019/21386A patent/TR201921386A2/en unknown
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2020
- 2020-12-24 WO PCT/TR2020/051378 patent/WO2021133353A2/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115504799A (en) * | 2022-09-09 | 2022-12-23 | 西安建筑科技大学 | Binding agent, C/SiC high-temperature wave-absorbing material and preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| TR201921386A2 (en) | 2021-07-26 |
| WO2021133353A3 (en) | 2021-09-23 |
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