WO2023146489A1 - Production of rapid hardening geopolymer repair material - Google Patents
Production of rapid hardening geopolymer repair material Download PDFInfo
- Publication number
- WO2023146489A1 WO2023146489A1 PCT/TR2022/050078 TR2022050078W WO2023146489A1 WO 2023146489 A1 WO2023146489 A1 WO 2023146489A1 TR 2022050078 W TR2022050078 W TR 2022050078W WO 2023146489 A1 WO2023146489 A1 WO 2023146489A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- repair material
- slag
- furnace slag
- basic oxygen
- activator solution
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
- C04B28/008—Mineral polymers other than those of the Davidovits type, e.g. from a reaction mixture containing waterglass
-
- 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
Definitions
- This invention relates to the production of a rapid hardening repair material suitable for use in the construction industry using slags originating from blast furnace and basic oxygen furnace that are generated during iron and steel manufacturing process, and the related repair material.
- BFS blast furnace slag
- BOF basic oxygen furnace
- the object of the present invention is to develop a method for producing a rapid hardening repair material by using slags originating from blast furnace and basic oxygen furnace that are generated during iron and steel manufacturing process.
- Another object of the present invention is to develop a method that enables the efficient utilization of basic oxygen furnace slag, which is generally stored in waste sites and pose a serious environmental problem, blended with blast furnace slag in the production of repair materials.
- the repair material obtained according to the invention sets in a short time.
- the incorporation of basic oxygen furnace slag enhances the early age compressive strength.
- Basic oxygen furnace slag can be used in high proportions in the repair material and it is ensured that this waste material is used efficiently.
- alkali activator solution containing sodium hydroxide and sodium silicate is added to the mixture of basic oxygen furnace and blast furnace slag.
- the blast furnace slag content varies depending on the ore, fuel and flux content and the details of the process.
- this slag is rich in oxides of mainly flux-derived elements such as silica, calcium oxide and aluminum oxide.
- the basic oxygen furnace slag content also varies depending on the loaded iron and flux content and the details of the pretreatment and oxidation processes. As a result of the oxidation of some of the iron together with the undesirable substances in the loaded iron, this slag contains miscellaneous metal oxides, especially miscellaneous iron(III) oxide, as well as flux-derived calcium oxide.
- the basic oxygen furnace slag used to realize the invention should preferably be weathered in the atmospheric conditions.
- the production method of rapid hardening repair material of the invention includes the steps of
- the slag mixture contains 20 to 80 percent of basic oxygen furnace slag by weight.
- the slag mixture and the activator solution are mixed such that the ratio of the activator solution is between 0.30 and 0.40 by weight.
- fine aggregate can also be added to the mixture of slag mixture and activator solution. Fine aggregate is added at a ratio of 10 to 60 percent by weight.
- the step of grinding at least one of the blast furnace slag and basic oxygen furnace slag can also be applied before the step of preparing the slag mixture.
- the fineness of the basic oxygen furnace slag positively affects the reactivity of this material in the repair material and its contribution to the mechanical properties.
- the diameter of 50% of the basic oxygen furnace slag particles may be smaller than a value between 10 and 60 pm.
- blast furnace slag with a Blaine specific surface area of 5000 ⁇ 500 cm 2 /g and basic oxygen furnace slag with a maximum particle size of less than 200 pm and 50% of the particles with a size of less than the value between 10 and 50 pm are used.
- the step of drying at least one of the blast furnace slag and basic oxygen furnace slag can also be applied. This step can be applied in the cases where stored slags, especially basic oxygen furnace slags, need to be dehumidified.
- Natural sand and/or crushed sand can be used as fine aggregate in the range of 0 to 5 mm.
- the slags whose chemical compositions are given in Table 1 are used.
- a repair material that sets and gains strength in a short time can be produced by adding alkali activator solution to the mixture of basic oxygen furnace and blast furnace slag.
- the repair material obtained with the invention at least meets the requirements of GRH (general rapid hardening) class according to ASTM Cl 600 standard and R2 class according to ASTM C928 standard in terms of strength.
- the invention enables to obtain a repair material that sets quickly and gains high compressive strength in a short time by using basic oxygen furnace slag and blast furnace slag, which are industrial wastes.
- the invention also allows for efficient utilization of basic oxygen furnace slag.
- the comparison of the rapid hardening repair material according to the invention with some repair mortars known in the art is also presented in Table 2 together with the relevant standards.
- the repair material obtained according to the invention has comparable or superior strength to its counterparts known in the art, and sets in a shorter time.
Landscapes
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
This invention relates to the production of a rapid hardening repair material suitable for use in the construction industry using slags originating from blast furnace and basic oxygen furnace that are generated during iron and steel manufacturing process, and the related repair material. With to the invention, it is possible to obtain rapid hardening geopolymer repair material by adding an alkali activator solution to the mixture of ground basic oxygen furnace slag and ground granulated blast furnace slag. The repair material obtained according to the invention sets in a short time. With setting, the repair material gains high early age strength. Basic oxygen furnace slag can be used at high proportions in the repair material and it is ensured that this waste material is efficiently utilized.
Description
DESCRIPTION
PRODUCTION OF RAPID HARDENING GEOPOLYMER REPAIR MATERIAL
Technical Field
This invention relates to the production of a rapid hardening repair material suitable for use in the construction industry using slags originating from blast furnace and basic oxygen furnace that are generated during iron and steel manufacturing process, and the related repair material.
Prior Art
In 2015, Iron and Steel Slag Report prepared by the Turkish Steel Producers Association; it has been stated that approximately 5.4 million tons of steelmaking slag was generated throughout Turkey in 2014, and more than half of these slags could not be utilized and consequently disposed. The blast furnace slag (BFS) is generally included in the inputs of cement and concrete production. On the other hand, basic oxygen furnace (BOF) slag has been previously utilized as aggregate in pavement and as railway ballast, however its application is limited due to the expansive behavior of BOF slag.
Some rapid hardening repair mortars are known in the state of the art. The strength and setting times of such mortars are determined by standards such as ASTM Cl 600 and C928.
Objects and Brief Description of the Invention
The object of the present invention is to develop a method for producing a rapid hardening repair material by using slags originating from blast furnace and basic oxygen furnace that are generated during iron and steel manufacturing process.
Another object of the present invention is to develop a method that enables the efficient utilization of basic oxygen furnace slag, which is generally stored in waste sites and pose a serious environmental problem, blended with blast furnace slag in the production of repair materials.
According to the invention, it is possible to obtain geopolymer repair material by adding an alkali activator solution to the mixture of ground basic oxygen furnace slag and ground
blast furnace slag. The repair material obtained according to the invention sets in a short time. The incorporation of basic oxygen furnace slag enhances the early age compressive strength. Basic oxygen furnace slag can be used in high proportions in the repair material and it is ensured that this waste material is used efficiently.
Detailed Description of the Invention
According to the production method of the rapid hardening repair material of the invention, basically, alkali activator solution containing sodium hydroxide and sodium silicate is added to the mixture of basic oxygen furnace and blast furnace slag.
The blast furnace slag content varies depending on the ore, fuel and flux content and the details of the process. As a result of the reduction of iron oxides in the ore content, this slag is rich in oxides of mainly flux-derived elements such as silica, calcium oxide and aluminum oxide.
The basic oxygen furnace slag content also varies depending on the loaded iron and flux content and the details of the pretreatment and oxidation processes. As a result of the oxidation of some of the iron together with the undesirable substances in the loaded iron, this slag contains miscellaneous metal oxides, especially miscellaneous iron(III) oxide, as well as flux-derived calcium oxide. The basic oxygen furnace slag used to realize the invention should preferably be weathered in the atmospheric conditions.
The production method of rapid hardening repair material of the invention includes the steps of
- preparing a slag mixture by mixing blast furnace slag with basic oxygen furnace slag,
- preparing an aqueous activator solution containing sodium hydroxide in molarity between 4 and 8 M and sodium silicate with a silica modulus between 0.8 and 1.4,
- mixing the solution with the slag mixture.
The slag mixture contains 20 to 80 percent of basic oxygen furnace slag by weight.
The slag mixture and the activator solution are mixed such that the ratio of the activator solution is between 0.30 and 0.40 by weight.
In an embodiment of the invention, fine aggregate can also be added to the mixture of slag mixture and activator solution. Fine aggregate is added at a ratio of 10 to 60 percent by weight.
Depending on the particle sizes of the slags to be used, the step of grinding at least one of the blast furnace slag and basic oxygen furnace slag can also be applied before the step of preparing the slag mixture. The fineness of the basic oxygen furnace slag positively affects the reactivity of this material in the repair material and its contribution to the mechanical properties. The diameter of 50% of the basic oxygen furnace slag particles may be smaller than a value between 10 and 60 pm. In a preferred embodiment of the invention, blast furnace slag with a Blaine specific surface area of 5000±500 cm2/g and basic oxygen furnace slag with a maximum particle size of less than 200 pm and 50% of the particles with a size of less than the value between 10 and 50 pm are used.
Before preparing the slag mixture, the step of drying at least one of the blast furnace slag and basic oxygen furnace slag can also be applied. This step can be applied in the cases where stored slags, especially basic oxygen furnace slags, need to be dehumidified.
Natural sand and/or crushed sand can be used as fine aggregate in the range of 0 to 5 mm.
In a preferred embodiment of the invention, the slags whose chemical compositions are given in Table 1 are used.
Table 1 - Chemical compositions of blast furnace slag and basic oxygen furnace slag
With the invention, a repair material that sets and gains strength in a short time can be produced by adding alkali activator solution to the mixture of basic oxygen furnace and blast furnace slag. The repair material obtained with the invention at least meets the requirements of GRH (general rapid hardening) class according to ASTM Cl 600 standard and R2 class according to ASTM C928 standard in terms of strength.
The invention enables to obtain a repair material that sets quickly and gains high compressive strength in a short time by using basic oxygen furnace slag and blast furnace slag, which are industrial wastes.
The invention also allows for efficient utilization of basic oxygen furnace slag. The comparison of the rapid hardening repair material according to the invention with some repair mortars known in the art is also presented in Table 2 together with the relevant standards.
Table 2 Repair mortars according to the invention and in the state of the art
As can be seen in Table 2, the repair material obtained according to the invention has comparable or superior strength to its counterparts known in the art, and sets in a shorter time.
Claims
CLAIMS A method of producing a rapid hardening repair material by mixing a slag and an activator solution; characterized in that a mixture of basic oxygen furnace slag and blast furnace slag is used as slag, and an aqueous activator solution containing sodium hydroxide and sodium silicate is used as activator solution. A method for producing the repair material according to Claim 1; characterized by an aqueous activator solution containing sodium hydroxide in molarity between 4 and 8 M and sodium silicate with a silica modulus between 0.8 and 1.4. A method for producing the repair material according to Claim 1; characterized in that a slag mixture containing 20 to 80 percent basic oxygen slag by weight is used. A method for producing the repair material according to Claim 1; characterized in that the slag mixture and the activator solution are mixed such that the ratio of the activator solution is between 0.30 and 0.40 by weight. A method for producing the repair material according to Claim 1; characterized in that a fine aggregate is added to the mixture of blended slag and activator solution. A method for producing the repair material according to Claim 5; characterized in that the fine aggregate is added in the ratio of 10 to 60 percent by weight. The rapid hardening repair material produced by the production method of the repair material according to any one of Claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/TR2022/050078 WO2023146489A1 (en) | 2022-01-28 | 2022-01-28 | Production of rapid hardening geopolymer repair material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/TR2022/050078 WO2023146489A1 (en) | 2022-01-28 | 2022-01-28 | Production of rapid hardening geopolymer repair material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023146489A1 true WO2023146489A1 (en) | 2023-08-03 |
Family
ID=87472388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/TR2022/050078 WO2023146489A1 (en) | 2022-01-28 | 2022-01-28 | Production of rapid hardening geopolymer repair material |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2023146489A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11171631A (en) * | 1997-12-12 | 1999-06-29 | Nippon Kayaku Co Ltd | Hydraulic composition |
| MY186371A (en) * | 2017-03-29 | 2021-07-18 | Univ Teknologi Malaysia Utm | Geopolymer mortar for repairing works |
| WO2022203641A2 (en) * | 2021-03-26 | 2022-09-29 | Yildiz Teknik Universitesi | Production method of geopolymer concrete |
-
2022
- 2022-01-28 WO PCT/TR2022/050078 patent/WO2023146489A1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11171631A (en) * | 1997-12-12 | 1999-06-29 | Nippon Kayaku Co Ltd | Hydraulic composition |
| MY186371A (en) * | 2017-03-29 | 2021-07-18 | Univ Teknologi Malaysia Utm | Geopolymer mortar for repairing works |
| WO2022203641A2 (en) * | 2021-03-26 | 2022-09-29 | Yildiz Teknik Universitesi | Production method of geopolymer concrete |
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