LU504510B1 - Machine-made sand geopolymer alkali activator concrete - Google Patents
Machine-made sand geopolymer alkali activator concrete Download PDFInfo
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- LU504510B1 LU504510B1 LU504510A LU504510A LU504510B1 LU 504510 B1 LU504510 B1 LU 504510B1 LU 504510 A LU504510 A LU 504510A LU 504510 A LU504510 A LU 504510A LU 504510 B1 LU504510 B1 LU 504510B1
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- concrete
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- geopolymer
- alkali activator
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- 239000004567 concrete Substances 0.000 title claims abstract description 57
- 239000012190 activator Substances 0.000 title claims abstract description 56
- 239000003513 alkali Substances 0.000 title claims abstract description 56
- 239000004576 sand Substances 0.000 title claims abstract description 49
- 229920000876 geopolymer Polymers 0.000 title claims abstract description 36
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 39
- 239000010881 fly ash Substances 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 21
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 20
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 17
- 239000011707 mineral Substances 0.000 claims abstract description 17
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 12
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims description 26
- 238000002360 preparation method Methods 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 4
- 239000004566 building material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 13
- 238000002156 mixing Methods 0.000 abstract description 4
- 239000010423 industrial mineral Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 11
- 239000002002 slurry Substances 0.000 description 8
- 239000002893 slag Substances 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229920003041 geopolymer cement Polymers 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003469 silicate cement Substances 0.000 description 3
- 239000012670 alkaline solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002894 chemical waste Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009439 industrial construction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic 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
- C04B28/006—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
Abstract
Disclosed is a machine-made sand geopolymer alkali activator concrete, and belongs to the technical field of concrete. The concrete includes the following raw materials in parts by mass: 1470-1500 parts of fly ash, 290-310 parts of mineral powder, 134-187 parts of metakaolin, 2200-2700 parts of gravels, 18-24 parts of graphene oxide and 303-402 parts of water; a dosage of alkali activator is 18-24%, and a sand ratio is 28-35%. The cementing material of the invention takes fly ash, industrial mineral powder and metakaolin as raw materials, alkali solutions such as sodium hydroxide, sodium silicate and sodium carbonate as activator, and graphene oxide as accelerators, and the high-strength machine-made sand geopolymer alkali activator concrete is successfully prepared by reasonably controlling the mixing ratios of the raw materials. The concrete is not easy to dry and crack, and has high strength and good stability.
Description
DESCRIPTION 7504570
MACHINE-MADE SAND GEOPOLYMER ALKALI ACTIVATOR
CONCRETE
The invention belongs to the technical field of concrete, and in particular to a machine-made sand geopolymer alkali activator concrete.
Cement is the most commonly used cementing material for concrete preparation. It has a wide range of uses and a huge amount in the construction industry. Because it consumes a lot of fossil fuels in its production process, it inevitably emits a lot of carbon dioxide. The generation of a large amount of construction waste and the carbon dioxide gas emitted by cement manufacturing have had a destructive impact on the environment. Geopolymer is a new type of high-performance inorganic material. It is a cementitious material prepared from waste residue (such as fly ash and blast furnace slag) discharged from industrial production and replaces cement.
The concept of geopolymer concrete was first put forward in 1978. It is a new type of concrete material with excellent properties, which is prepared with geopolymer as cementing material. Geopolymer concrete is also known as a new type of green material in the 21% century because of its wide sources of raw materials, low energy consumption in the preparation process and little environmental pollution. Geopolymer concrete has the advantages of good fire resistance, frost resistance, corrosion resistance, permeability resistance and long-term strength. But at the same time, there are also some problems, such as too fast condensation speed, alkali-aggregate reaction, easy drying shrinkage and cracks, and uncertainty of strength development. Different kinds HUS04510 and dosage of alkali activator, the use of fly ash, mineral powder and other admixtures, and different curing conditions will all bring about different properties.
Therefore, it is of great significance to find a geopolymer concrete with good performance and strong machinability to replace the ordinary silicate cement concrete for the sustainable development of social economy.
Aiming at the problems existing in the prior art, the invention provides a machine-made sand geopolymer alkali activator concrete.
In order to achieve the above objective, the present invention provides the following technical schemes.
A machine-made sand geopolymer alkali activator concrete, including the following raw materials in parts by mass: 1470-1500 parts of fly ash, 290-310 parts of mineral powder, 134-187 parts of metakaolin, 2200-2700 parts of gravels, 18-24 parts of graphene oxide and 303-402 parts of water; a dosage of alkali activator is 18-24%, and a sand ratio is 28-35%.
Further, the alkali activator is compounded by sodium hydroxide, sodium silicate and sodium carbonate, and a mass ratio is (54-67) :(344-430) (28-37).
Under an appropriate dosage ratio, different alkali activators promote each other and the degree of polymerization is higher.
Further, a raw material for controlling sand ratio is machine-made sand.
Further, the fly ash is first-class fly ash; and the mineral powder is S95 grade mineral powder.
Further, the metakaolin is a powder with more than 200 meshes obtained by calcining natural kaolin at 500-800°C.
The invention also provides a preparation method of the machine-made sand geopolymer alkali activator concrete, including the following steps:
weighing raw materials by mass, dispersing alkali activator in water, HUS04510 adding fly ash, mineral powder and metakaolin in turn, slowly stirring for 2 min, adding machine-made sand, and continuously stirring for 1 min; then adding a part of graphene oxide, slowly stirring for 2 min, then adding the remaining graphene oxide, slowly stirring for 2 min, then changing to fast stirring for 3 min, and then curing, so as to obtain the machine-made sand geopolymer alkali activator concrete.
Further, a rotating speed of the slow stirring is 200-300 rpm; and a rotating speed of the fast stirring is 3000-4500 rpm.
Further, the curing is natural curing for 24 hours after standard curing for 24 hours.
The invention also provides an application of the machine-made sand geopolymer alkali activator concrete as a building material.
Fly ash is mainly in an irregular spherical shape, with a glass structure equivalent to a rolling ball. Slag is in a multi angle granular shape. The rolling ball structure of fly ash may effectively reduce the resistance between slurry particles during relative slip, thereby promoting slurry flow and better performance. However, the slag, due to its large specific surface area and irregular shape, is not conducive to the relative slip of slurry particles, thus reducing the fluidity of the slurry. The structure of metakaolin will be highly destroyed after calcination at high temperature, and the active state of the raw material will change into amorphous. So, the activity of Si and Al substances in the raw material is improved. Its high content of Si and Al substances will provide elements for polymerization, promote the formation of AI-O-AI bonds, and the dissociation of the Al layer will also promote the rapid dissolution of Si.
The interaction between graphene oxide and alkaline solution produces cross-linked reduced graphene oxide. These cross-linked particles make the pores and gaps of fly ash geopolymer fully filled and bridged, making its structure more compact and the performance of concrete greatly improved.
Compared with the prior art, the invention has the following advantages HUS04510 and technical effects.
Cementing materials need good cementitious activity, and fly ash and blast furnace slag after water quenching and granulation have this characteristic, so industrial waste residue mixed with alkaline activator may be used as cementing materials, and the appearance of geopolymer provides the possibility of replacing cement. The cementing material of the invention takes fly ash, industrial mineral powder and metakaolin as raw materials, alkali solutions such as sodium hydroxide, sodium silicate and sodium carbonate as activator, and graphene oxide as accelerators, and the high-strength machine-made sand geopolymer alkali activator concrete is successfully prepared by reasonably controlling the mixing ratios of the raw materials.
The manufactured sand geopolymer alkali activator concrete prepared by the invention is not easy to dry and crack, and has high strength and good stability.
Various exemplary embodiments of the present invention will now be described in detail, which should not be regarded as a limitation of the present invention, but rather as a more detailed description of certain aspects, characteristics and embodiments of the present invention.
It should be understood that the terms described in the present invention are only for describing specific embodiments, and are not intended to limit the present invention. In addition, as for the numerical range in the present invention, it should be understood that every intermediate value between the upper limit and the lower limit of the range is also specifically disclosed.
Intermediate values within any stated value or stated range and every smaller range between any other stated value or intermediate values within the stated range are also included in the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the HUS04510 range.
Unless otherwise stated, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present invention relates. Although the present invention only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein may be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe methods and/or materials related to the documents. In case of conflict with any incorporated documents, the contents of this specification shall prevail.
Without departing from the scope or spirit of the invention, it is obvious to those skilled in the art that many modifications and changes may be made to the specific embodiments of the specification of the invention. Other embodiments derived from the description of the present invention will be apparent to the skilled person. The specification and examples of this application are only exemplary.
As used herein, the terms “including”, “comprising”, “having”, “containing”, etc. are all open terms, and they mean including but not limited to.
The natural temperature mentioned in the present invention refers to normal temperature.
Unless otherwise specified, the "room temperature” and "normal temperature" in the present invention are all calculated at 25+2°C.
Unless otherwise specified, the "parts" mentioned in the present invention are all counted as "parts by mass".
The raw materials used in the following embodiments of the invention are all commercially available. The sodium hydroxide used is commercially technical grade with a purity of 99%. Sodium silicate is commercially technical grade with a modulus of 2.7.
Geopolymer replacing silicate cement may promote the scientific and HUS04510 efficient utilization of solid waste such as fly ash, industrial slag and industrial construction waste, and reduce the damage to natural resources exploitation and natural environment. Moreover, geopolymers have excellent properties of organic polymers, ceramics and cement, such as high strength, good impermeability, good acid and alkali resistance, and may withstand radiation and water for a long time without aging. Especially, the durability of geopolymers is incomparable to that of silicate cement, making it have great potential to replace cement in sealing various chemical wastes, toxic heavy metal ions and nuclear wastes. Aiming at the problems of too fast condensation speed, alkali-aggregate reaction, easy occurrence of drying shrinkage and cracks, and uncertainty of strength development in geopolymer concrete at present, the invention obtains a machine-made sand geopolymer alkali activator concrete with moderate condensation speed, high strength and good stability, and it is not easy to dry shrinkage and cracks, as follows.
A machine-made sand geopolymer alkali activator concrete, including the following raw materials in parts by mass: 1470-1500 parts of fly ash, 290-310 parts of mineral powder, 134-187 parts of metakaolin, 2200-2700 parts of gravels, 18-24 parts of graphene oxide and 303-402 parts of water; a dosage of alkali activator is 18-24%, and a sand ratio is 28-35%.
In some preferred embodiments, the machine-made sand geopolymer alkali activator concrete includes the following raw materials in parts by mass: 1480 parts of fly ash, 296 parts of mineral powder, 159 parts of metakaolin, 2500 parts of gravels, 21 parts of graphene oxide and 336 parts of water; a dosage of alkali activator is 22%, and a sand ratio is 28%.
In some preferred embodiments, the alkali activator is compounded by HUS04510 sodium hydroxide, sodium silicate and sodium carbonate, and a mass ratio is (54-67):(344-430):(28-37). Under an appropriate dosage ratio, different alkali activators promote each other and the degree of polymerization is higher. More preferably, the mass ratio of sodium hydroxide, sodium silicate and sodium carbonate is 6:40:3. The alkali activator in the present invention may also be preferably compounded with sodium hydroxide, sodium silicate and calcium carbonate, with the mass ratio of (54-67):(344-430):(10-18), more preferably 4:28:1.
In some preferred embodiments, a raw material for controlling sand ratio is machine-made sand with a particle size of 10-50 microns. The machine-made sand with this particle size plays the role of micro-aggregate filling in the internal layout, not only improving the strength of concrete, but also improving the workability of concrete.
In some preferred embodiments, the fly ash is first-class fly ash; and the mineral powder is S95 grade mineral powder. The fly ash is mainly in an irregular spherical shape, with a glass structure equivalent to a rolling ball.
Slag is in a multi angle granular shape. The rolling ball structure of fly ash may effectively reduce the resistance between slurry particles during relative slip, thereby promoting slurry flow and better performance. However, the slag, due to its large specific surface area and irregular shape, is not conducive to the relative slip of slurry particles, thus reducing the fluidity of the slurry. The interaction between graphene oxide and alkaline solution produces cross-linked reduced graphene oxide. These cross-linked particles make the pores and gaps of fly ash geopolymer fully filled and bridged, making its structure more compact and the performance of concrete greatly improved.
The gravels are formed by mixing two particle sizes of 5-10 mm and 11-15 mm according to a mass ratio of 1:2.
In some preferred embodiments, the metakaolin is a powder with more than 200 meshes obtained by calcining natural kaolin at 500-800°C. The structure of metakaolin will be highly destroyed after calcination at high HUS04510 temperature, and the active state of the raw material will change into amorphous. So, the activity of Si and Al substances in the raw material is improved. Its high content of Si and Al substances will provide elements for polymerization, promote the formation of Al-O-Al bonds, and the dissociation of the Al layer will also promote the rapid dissolution of Si.
The invention also provides a preparation method of the machine-made sand geopolymer alkali activator concrete, including the following steps: weighing raw materials by mass, dispersing alkali activator in water, adding fly ash, mineral powder and metakaolin in turn, slowly stirring for 2 min, adding machine-made sand, and continuously stirring for 1 min; then adding a part of graphene oxide, slowly stirring for 2 min, then adding the remaining graphene oxide, slowly stirring for 2 min, then changing to fast stirring for 3 min, and then curing, so as to obtain the machine-made sand geopolymer alkali activator concrete.
In some preferred embodiments, a rotating speed of the slow stirring is 200-300 rpm; and a rotating speed of the fast stirring is 3000-4500 rpm. A mass ratio of graphene oxide added twice is 1:1.
In some preferred embodiments, the curing is natural curing for 24 hours after standard curing for 24 hours. The standard curing means curing at the temperature of 20+2°C and the humidity of 98%. The natural curing means that the concrete surface is covered with appropriate materials and watered under the natural condition that the natural temperature is higher than 5°C, so that the concrete may be cured under the natural temperature (higher than +5°C) and humidity of 98%.
The invention also provides an application of the machine-made sand geopolymer alkali activator concrete as a building material.
The main components and contents of fly ash and mineral powder used in HUS04510 the following embodiments of the invention are as follows: 50: [ms re [a0 [10:50 [eo [wo eo a 33.12 | 15.32 0.19 | 35.89 2.41 | 0.46 7.91 | 0.31 powder
The following embodiments serve as a further explanation of the technical scheme of the present invention.
Embodiments 1-3
A preparation method of the machine-made sand geopolymer alkali activator concrete, including the following steps: weighing the raw materials according to the quality shown in Table 1, dispersing alkali activator in water, then adding fly ash, mineral powder and metakaolin in turn, stirring at 250 rpm for 2 min, adding machine-made sand, and continuing stirring at 250 rpm for 1 min; then adding half the mass of graphene oxide, stirring at 250 rpm for 2 min, then adding the remaining graphene oxide, stirring at 250 rpm for 2 min, then stirring at 4000 rpm for 3 min, pouring into a mold, vibrating for 200 times on a vibration table (ZS-15), placing at room temperature for demolding and naturally curing for 24 hours after standard curing, thus obtaining the machine-made sand geopolymer alkali activator concrete.
Table 1 Raw materials and dosage of each embodiment HUS04510
OO
Raw material
Graphene 21 18 20 a fr fe
The sand ratio of each embodiment is controlled to be 28% by the amount of machine-made sand.
The dosage of alkali activator (the mass ratio of sodium hydroxide, sodium silicate and sodium carbonate is 6:40:3) is 22%.
The gravels are formed by mixing two particle sizes of 5-10 mm and 11-15 mm according to a mass ratio of 1:2.
Performance test: 1. The concretes prepared in the above embodiments are made into a concrete cube specimen with a side length of 150 mm and a prism specimen with a side length of 150x150x300 mm, and the compressive strength, axial compressive strength and concrete elastic modulus of the specimens are measured according to the Test Method Standard for Physical and Mechanical
Properties of Concrete (GB/T50081-2019) (see Table 2-3). Each test is repeated for 3 times, and an average value is taken.
The testing equipment is NYL-2000, pressure testing machine and TM-2 elastic modulus tester.
. . . . ; LU504510
Testing method and judging rules: cube specimens provide measured values of compressive strength, while prism specimens provide measured values of axial compressive strength and elastic modulus of a single specimen, so they are not qualified.
Table 2
Embodiment | Embodimen | Embodime 1 t2 nt 3 sw le ms
Compressive strength (MPa)
Table 3 Test results
Compressive strength (MPa)
Elastic modulusx10* (MPa)
Embodiment 1
Axial compressive strength 126 (MPa)
Compressive strength (MPa)
Elastic modulusx10* (MPa)
Embodiment 2
Axial compressive strength 121 (MPa)
Compressive strength (MPa)
Elastic modulusx10* (MPa)
Embodiment 3
Axial compressive strength 124 (MPa)
As may be seen from Table 2-3, the concrete prepared in Embodiment 1 HUS04510 has the highest compressive strength and axial compressive strength, and has good stability. 2. The slump of concretes prepared in Embodiments 1-3 is measured, and the results are shown in Table 4.
Table 4
Embodiment | Embodiment | Embodiment 1 2 3
As may be seen from Table 4, the concretes prepared by the embodiments of the invention have low slump and are not easy to dry and crack.
Embodiment 4
Based on Embodiment 1, the dosage of alkali activator is changed, and the dosages of alkali activator (the mass ratio of sodium hydroxide, sodium silicate and sodium carbonate is 6:40:3) are 18%, 20%, 22% (Embodiment 1) and 24%, respectively. The influence of different dosages of alkali activator on concrete performance is studied, and the results of 28d compressive strength are shown in Table 5.
Table 5 LU504510
As may be seen from Table 5, the dosage of alkali activator is not the more the better, nor the less the better. Only in a specific proportion may the concrete with the strongest performance be obtained.
Embodiment 5
Based on Embodiment 1, the sand ratio is changed, and the sand ratios are set to be 28% (Embodiment 1), 30%, 33% and 35% respectively. The influence of different sand ratios on concrete performance is studied, and the results of 28d compressive strength are shown in Table 6.
Table 6
SE
As may be seen from Table 6, the performance of concrete is the strongest when the sand ratio is kept at 28%.
Embodiment 6
It is the same as in Embodiment 1, except that the alkali activator is replaced by sodium hydroxide, sodium silicate and calcium carbonate with a mass ratio of 4:28:1. The 28d compressive strength of the obtained concrete is 135 MPa and the slump degree is 12 mm.
Comparative embodiment 1 HUS04510
It is the same as in Embodiment 1, except that the mass ratio of sodium hydroxide, sodium silicate and sodium carbonate in the alkali activator is adjusted to 1:8:1. The 28d compressive strength of the obtained concrete is 135 MPa and the slump degree is 20 mm.
Comparative embodiment 2
It is the same as in Embodiment 1, except that sodium hydroxide, water glass, sodium carbonate and calcium carbonate were mixed in the mass ratio of 1:8:1:1 to prepare a new alkali activator to replace the alkali activator in the
Embodiment 1. The 28d compressive strength of the obtained concrete is 119
MPa and the slump degree is 36 mm.
Comparative embodiment 3
It is the same as in Embodiment 1, except that all gravels are replaced with gravels with a particle size of 5-10 mm. The 28d compressive strength of the obtained concrete is 128 MPa and the slump degree is 15 mm.
Comparative embodiment 4
It is the same as in Embodiment 1, except that the curing condition is changed to: standard curing for 48 hours. The 28d compressive strength of the obtained concrete is 133 MPa and the slump degree is 14 mm.
The above are only the preferred embodiments of this application, but the protection scope of this application is not limited to this. Any change or replacement that may be easily thought of by any technician familiar with the technical field within the scope of technology disclosed in this application should be covered by the scope of protection of this application. Therefore, the scope of protection of this application shall be subject to the scope of protection of the claims.
Claims (9)
1. A machine-made sand geopolymer alkali activator concrete, comprising the following raw materials in parts by mass: 1470-1500 parts of fly ash, 290-310 parts of mineral powder, 134-187 parts of metakaolin, 2200-2700 parts of gravels, 18-24 parts of graphene oxide and 303-402 parts of water; a dosage of alkali activator is 18-24%, and a sand ratio is 28-35%.
2. The machine-made sand geopolymer alkali activator concrete according to claim 1, characterized in that the alkali activator is compounded by sodium hydroxide, sodium silicate and sodium carbonate, and a mass ratio is (54-67):(344-430):(28-37).
3. The machine-made sand geopolymer alkali activator concrete according to claim 1, characterized in that a raw material for controlling sand ratio is machine-made sand.
4. The machine-made sand geopolymer alkali activator concrete according to claim 1, characterized in that the fly ash is first-class fly ash; and the mineral powder is S95 grade mineral powder.
5. The machine-made sand geopolymer alkali activator concrete according to claim 1, characterized in that the metakaolin is a powder with more than 200 meshes obtained by calcining natural kaolin at 500-800°C.
6. A preparation method of the machine-made sand geopolymer alkali HUS04510 activator concrete according to any one of claims 1-5, comprising: weighing raw materials by mass, dispersing alkali activator in water, adding fly ash, mineral powder and metakaolin in turn, slowly stirring for 2 min, adding machine-made sand, and continuously stirring for 1 min; then adding a part of graphene oxide, slowly stirring for 2 min, then adding the remaining graphene oxide, slowly stirring for 2 min, then changing to fast stirring for 3 min, and then curing, so as to obtain the machine-made sand geopolymer alkali activator concrete.
7. The preparation method according to claim 6, characterized in that a rotating speed of the slow stirring is 200-300 rpm; and a rotating speed of the fast stirring is 3000-4500 rpm.
8. The preparation method according to claim 6, characterized in that the curing is natural curing for 24 hours after standard curing for 24 hours.
9. An application of the machine-made sand geopolymer alkali activator concrete according to any one of claims 1-5 as a building material.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310602170 | 2023-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU504510B1 true LU504510B1 (en) | 2023-12-18 |
Family
ID=89384454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU504510A LU504510B1 (en) | 2023-05-24 | 2023-06-15 | Machine-made sand geopolymer alkali activator concrete |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU504510B1 (en) |
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2023
- 2023-06-15 LU LU504510A patent/LU504510B1/en active IP Right Grant
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