CN115304295A - High-doped waste marble powder-slag-based alkali-activated cementing material and preparation method thereof - Google Patents
High-doped waste marble powder-slag-based alkali-activated cementing material and preparation method thereof Download PDFInfo
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- CN115304295A CN115304295A CN202210829282.0A CN202210829282A CN115304295A CN 115304295 A CN115304295 A CN 115304295A CN 202210829282 A CN202210829282 A CN 202210829282A CN 115304295 A CN115304295 A CN 115304295A
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- 239000004579 marble Substances 0.000 title claims abstract description 94
- 239000002699 waste material Substances 0.000 title claims abstract description 93
- 239000003513 alkali Substances 0.000 title claims abstract description 76
- 239000000463 material Substances 0.000 title claims abstract description 58
- 239000002893 slag Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 113
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 75
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 47
- 239000011707 mineral Substances 0.000 claims abstract description 47
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 38
- 239000007864 aqueous solution Substances 0.000 claims abstract description 38
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 38
- 238000003756 stirring Methods 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 26
- 239000012190 activator Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000005303 weighing Methods 0.000 claims abstract description 6
- 239000011734 sodium Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000011812 mixed powder Substances 0.000 claims description 5
- 239000002243 precursor Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 11
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 239000002910 solid waste Substances 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 2
- 239000004575 stone Substances 0.000 abstract description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000010438 granite Substances 0.000 description 2
- 238000003837 high-temperature calcination Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010998 test method Methods 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A high-content waste marble powder-slag-based alkali-activated cementing material and a preparation method thereof relate to the technical field of low-carbon building materials, and the cementing material comprises the following components in parts by weight: 220-320 parts of waste marble powder, 120-220 parts of S95 mineral powder, 150-250 parts of alkali activator and 80-130 parts of water; the alkali activator consists of sodium silicate aqueous solution and sodium hydroxide particles; the method comprises the steps of weighing the raw materials according to weight, and mixing and stirring uniformly to obtain the cementing material. The waste marble powder adopted by the invention is derived from solid waste of a stone processing factory, and is mixed with mineral powder to prepare the binary gelled material, so that the problem of insufficient activity of the waste marble powder as a precursor can be solved, and the problem of too short setting time of unitary slag cement can be solved; and the mixing amount of the waste marble powder is greatly improved, so that the aim of maximally utilizing resources in the field of alkali-activated precursor materials is fulfilled.
Description
Technical Field
The invention relates to the technical field of low-carbon building materials, in particular to a high-content waste marble powder-slag-based alkali-activated cementing material and a preparation method thereof.
Background
With the rapid development of social economy, the building industry shows a growing trend like bamboo shoots in spring after rain, and cement is used as an indispensable cementing material in building engineering, and the yield of the cement is continuously increased. However, the production of cement requires a 'two-grinding and one-burning' process, consumes a large amount of energy and discharges a large amount of CO 2 Is one of the important causes of the greenhouse effect. The alkali-activated cement can be excited in an alkaline medium to form strength by using the solid waste rich in aluminosilicate as a precursor material, is expected to become a novel low-carbon cementing material for replacing cement, realizes the aims of recycling solid waste and reducing carbon emission, and becomes a research hotspot in recent years.
Granulated blast furnace slag is waste slag generated in the steel industry, has extremely strong pozzolanic property after being ground, and can form a high-strength cementing material under the alkali excitation condition. However, the setting time of the unitary slag cement is too short, and even flash set occurs, so that the unitary slag cement cannot meet the application in engineering.
In addition, as a decorative material commonly used in the construction industry, the yield of marble slabs shows a tendency to increase continuously. However, the waste powder is inevitably generated during the processing of the panel, and if it is not properly treated, the waste marble powder accumulated everywhere occupies a large amount of land resources, and there is a high possibility that the influence on the local ecological environment is caused. Since the main component of the waste marble powder is calcium carbonate and is inert, the waste marble powder is mainly used as a filler in concrete at present, but the utilization rate is still low, and a better way is needed to be found for further improving the recycling rate of the waste marble powder. The invention patent application with publication number CN 110981234A discloses a cementing material and a preparation method thereof, wherein the cementing material comprises the following raw material components in parts by weight: 40-60 parts of slag, 10-30 parts of marble powder, 10-30 parts of granite powder and 3-8 parts of alkali activator. Although the patent can effectively utilize marble powder and granite powder, the dosage of the waste marble powder is still less, and the defect of short condensation time exists.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the high-doping-amount waste marble powder-slag-based alkali-activated cementing material and the preparation method thereof are provided, so that the aim of realizing the maximum utilization of resources in the field of alkali-activated precursor materials by the waste marble powder is fulfilled by reducing the consumption of slag and greatly increasing the doping amount of the waste marble powder on the basis of obtaining the cementing material with excellent mechanical properties, and the problem of too short setting time of unitary slag cement in the prior art is solved.
The technical scheme for solving the technical problems is as follows: a high-content waste marble powder-slag-based alkali-activated cementing material comprises the following raw materials in parts by weight: 220-320 parts of waste marble powder, 120-220 parts of mineral powder, 150-250 parts of alkali activator and 80-130 parts of water.
The further technical scheme of the invention is as follows: the basic parameters of the waste marble powder are as follows: caO is more than or equal to 50wt%, ignition loss is more than or equal to 38wt%, and specific surface area is more than or equal to 1m 2 /g。
The further technical scheme of the invention is as follows: the mineral powder is S95 mineral powder, and the basic parameters of the S95 mineral powder are as follows: caO more than or equal to 50wt%, siO 2 ≥20wt%，Al 2 O 3 More than or equal to 10wt%, ignition loss more than or equal to 0.6wt%, and specific surface area more than or equal to 0.4m 2 /g。
The further technical scheme of the invention is as follows: the alkali activator is a mixed solution of a sodium silicate aqueous solution and sodium hydroxide particles, and the sodium silicate aqueous solution comprises the following chemical components in percentage by weight: siO2 2 ≥25wt%，Na 2 O≥6wtPercent, the modulus of the sodium silicate aqueous solution is 3.0-3.8; the mass fraction ratio of the sodium silicate aqueous solution to the sodium hydroxide particles is (4-6) to 1.
The other technical scheme of the invention is as follows: a preparation method of a high-doped waste marble powder-slag-based alkali-activated cementing material comprises the following steps:
(1) weighing the following materials in parts by weight: 220-320 parts of waste marble powder, 120-220 parts of mineral powder, 150-250 parts of alkali activator and 80-130 parts of water;
(2) adding the waste marble powder and the mineral powder into a stirring pot, and stirring at a low speed for 1-3 min to prepare mixed powder;
(3) uniformly mixing an alkali activator and water to prepare a mixed alkali liquor;
(4) and adding the mixed alkali liquor into the stirring pot, and stirring at a low speed for 1-3 min to prepare the high-doped waste marble powder-slag-based alkali-activated cementing material.
The further technical scheme of the invention is as follows: the basic parameters of the waste marble powder are as follows: caO is more than or equal to 50wt%, ignition loss is more than or equal to 38wt%, and specific surface area is more than or equal to 1m 2 /g。
The invention has the further technical scheme that: the mineral powder is S95 mineral powder, and the basic parameters of the S95 mineral powder are as follows: caO is more than or equal to 50wt%, siO 2 ≥20wt%，Al 2 O 3 More than or equal to 10wt%, ignition loss more than or equal to 0.6wt%, and specific surface area more than or equal to 0.4m 2 /g。
The invention has the further technical scheme that: the alkali activator is a mixed solution of a sodium silicate aqueous solution and sodium hydroxide particles, and the sodium silicate aqueous solution comprises the following chemical components in percentage by weight: siO2 2 ≥25wt%，Na 2 O is more than or equal to 6wt%, and the modulus of the sodium silicate aqueous solution is 3.0-3.8; the mass fraction ratio of the sodium silicate aqueous solution to the sodium hydroxide particles is (4-6) to 1.
The further technical scheme of the invention is as follows: in the steps (2) and (4), the low-speed stirring refers to the stirring speed of 140 +/-5 revolutions per minute.
Due to the adoption of the structure, compared with the prior art, the high-doped waste marble powder-slag-based alkali-activated cementing material and the preparation method thereof have the following beneficial effects:
1. can obtain the cementing material with excellent mechanical property
The cementing material comprises the following raw materials in parts by weight: 220-320 parts of waste marble powder, 120-220 parts of mineral powder, 150-250 parts of alkali activator and 80-130 parts of water. The waste marble powder is waste powder generated by cutting and polishing in a marble material processing factory, and the main component of the marble powder is calcium carbonate; calcium carbonate is a feasible solution as an alkali-activated precursor material, but the activity of calcium carbonate is low, and the alkali-activated precursor material with high activity needs to be doped to meet the requirement of basic mechanical properties. Therefore, the invention can prepare the cementing material with excellent mechanical properties by adding a small amount of S95 mineral powder with higher activity while greatly increasing the dosage of the waste marble powder and reasonably proportioning. Tests prove that the cementing material prepared by the invention has good fluidity, the initial setting time meets the specification that the Portland cement is more than or equal to 45min in the current specification, and the construction requirement can be met. In addition, the invention selects the alkali-activator with proper proportion, when the mixing amount of the waste marble powder reaches 72.7 percent, the compressive strength at the age of 28d reaches more than 42.5MPa, and the invention meets the requirement of Portland cement with the specification P.II 42.5R.
2. Can maximize the utilization of the waste marble powder
According to the invention, through reasonable proportioning optimization, the usage amount of slag obtained only by high-temperature calcination is reduced, and simultaneously, a large amount of waste marble powder is doped, wherein the doping amount of the waste marble powder is 50-72.7%, and the doping amount of the waste marble powder is the mass sum of the waste marble powder and the mineral powder and the proportion of the waste marble powder. Therefore, the invention greatly improves the utilization rate of solid waste resources of the waste marble powder, changes waste into valuable and realizes the maximum utilization of resources in the field of alkali-activated precursor materials.
3. Not only can solve the problem of insufficient activity of the waste marble powder as a precursor, but also can solve the problem of too short setting time of the unary slag cement
On the one hand, if only the waste marble powder is used as a precursor material, the activity is insufficient; on the other hand, the activity of the ore dust is so high that the setting time of the monadic system is too short if only the ore dust is used as a precursor. The binary gelled material is prepared by adopting a technical means of re-doping the waste marble powder with a large amount and a small amount of mineral powder, has a complementary effect, solves the problem of insufficient activity of the waste marble powder as a precursor, reduces the activity of only the mineral powder as a unitary precursor system, and slows down the condensation speed.
4. Low production cost, energy saving and environmental protection
Compared with the situation that high-volcanic ash active raw materials such as slag and the like can be obtained after high-temperature calcination, the waste marble powder adopted by the invention is used as natural industrial solid waste and can be used after simple treatment, so that the production cost is greatly reduced, and the low-carbon energy-saving concept is met.
In addition, the invention can greatly adjust the condensation time only by adjusting the mixing amount of the waste marble powder, and is more environment-friendly and easier to realize than adjusting the alkali activator. Compared with cement production, the method has the functions of energy conservation and emission reduction, and has important significance in the aspects of alleviating greenhouse effect and protecting ecological environment.
The technical features of a highly doped waste marble dust-slag based alkali-activated cementitious material and a method for preparing the same according to the present invention will be further described with reference to examples.
Detailed Description
Example one
A high-content waste marble powder-slag-based alkali-activated cementing material comprises the following raw materials in parts by weight: 320 parts of waste marble powder, 120 parts of mineral powder, 180 parts of alkali activator and 100 parts of water; wherein:
the basic parameters of the waste marble powder are as follows: caO content 54.1wt%, loss on ignition 42.5wt%, specific surface area 1.1m 2 /g；
The mineral powder is S95 mineral powder, the S95 mineral powder is finely ground granulated blast furnace slag powder, and the basic parameters of the S95 mineral powder are as follows: caO content 56.9wt%, siO 2 25.6wt% of Al 2 O 3 The content is 12.1wt%, the loss on ignition is 0.72wt%, and the specific surface area is 0.43m 2 /g；
The alkali activator is a mixed solution of sodium silicate aqueous solution and sodium hydroxide particles, silicic acidThe chemical composition and content of the sodium water solution are as follows: siO2 2 27.7wt% of Na 2 The O content is 8.4wt%, and the modulus of the sodium silicate aqueous solution is 3.4; the mass fraction ratio of the sodium silicate aqueous solution to the sodium hydroxide particles is 5:1, namely 150 parts of sodium silicate aqueous solution and 30 parts of sodium hydroxide particles, wherein the purity of the sodium hydroxide particles is more than or equal to 96 percent.
The preparation method of the high-content waste marble powder-slag-based alkali-activated cementing material comprises the following steps:
(1) weighing the following materials in parts by weight: 320 parts of waste marble powder, 120 parts of mineral powder, 150 parts of sodium silicate aqueous solution, 30 parts of sodium hydroxide particles and 100 parts of water;
(2) adding waste marble powder and mineral powder into a stirring pot, and stirring at a low speed for 2min to prepare mixed powder;
(3) uniformly mixing water, a sodium silicate aqueous solution and sodium hydroxide particles to prepare a mixed alkali liquor;
(4) and adding the mixed alkali liquor into the stirring pot, and stirring at a low speed for 2min to obtain the high-content waste marble powder-slag-based alkali-activated cementing material.
In the steps (2) and (4), the low-speed stirring refers to the stirring speed of 140 +/-5 revolutions per minute.
Example two
A high-content waste marble powder-slag-based alkali-activated cementing material comprises the following raw materials in parts by weight: 270 parts of waste marble powder, 170 parts of mineral powder, 180 parts of alkali activator and 100 parts of water;
the basic parameters of the waste marble powder are as follows: caO content 54.1wt%, loss on ignition 42.5wt%, specific surface area 1.1m 2 /g；
The mineral powder is S95 mineral powder, the S95 mineral powder is finely ground granulated blast furnace slag powder, and the basic parameters of the S95 mineral powder are as follows: caO content 56.9wt%, siO 2 25.6wt% of Al 2 O 3 The content is 12.1wt%, the loss on ignition is 0.72wt%, and the specific surface area is 0.43m 2 /g；
The alkali activator is a mixed solution of sodium silicate aqueous solution and sodium hydroxide particles, and the sodium silicate aqueous solution comprises the following chemical components in percentage by weight: siO2 2 27.7wt% of Na 2 O content 8.4wt%, sodium silicateThe modulus of the aqueous solution is 3.4; the mass fraction ratio of the sodium silicate aqueous solution to the sodium silicate aqueous solution is 5 percent, namely 150 parts of the sodium silicate aqueous solution and 30 parts of sodium hydroxide particles, wherein the purity of the sodium hydroxide particles is more than or equal to 96 percent.
The preparation method of the high-content waste marble powder-slag-based alkali-activated cementitious material in the second embodiment includes the following steps:
(1) weighing the following materials in parts by weight: 270 parts of waste marble powder, 170 parts of S95 mineral powder, 150 parts of sodium silicate aqueous solution, 30 parts of sodium hydroxide particles and 100 parts of water;
(2) adding waste marble powder and mineral powder into a stirring pot, and stirring at a low speed for 2min to prepare mixed powder;
(3) uniformly mixing water, a sodium silicate aqueous solution and sodium hydroxide particles to prepare a mixed alkali liquor;
(4) and adding the mixed alkali liquor into the stirring pot, and stirring at a low speed for 2min to obtain the high-content waste marble powder-slag-based alkali-activated cementing material.
In the steps (2) and (4), the low-speed stirring refers to the stirring speed of 140 +/-5 revolutions per minute.
EXAMPLE III
A high-content waste marble powder-slag-based alkali-activated cementing material comprises the following raw materials in parts by weight: 220 parts of waste marble powder, 220 parts of mineral powder, 180 parts of alkali activator and 100 parts of water;
the basic parameters of the waste marble powder are as follows: caO content 54.1wt%, loss on ignition 42.5wt%, specific surface area 1.1m 2 /g；
The mineral powder is S95 mineral powder, the S95 mineral powder is ground granulated blast furnace slag powder, and the basic parameters of the S95 mineral powder are as follows: caO content 56.9wt%, siO 2 Content 25.6wt%, al 2 O 3 The content is 12.1wt%, the loss on ignition is 0.72wt%, and the specific surface area is 0.43m 2 /g；
The alkali activator is a mixed solution of sodium silicate aqueous solution and sodium hydroxide particles, and the sodium silicate aqueous solution comprises the following chemical components in percentage by weight: siO2 2 27.7wt% of Na 2 The O content is 8.4wt%, and the modulus of the sodium silicate aqueous solution is 3.4; the mass fraction ratio of the sodium silicate aqueous solution to the sodium hydroxide particles is 530 parts of particles, and the purity of the sodium hydroxide particles is more than or equal to 96 percent.
The preparation method of the high-content waste marble powder-slag-based alkali-activated cementing material comprises the following steps of:
(1) weighing the following materials in parts by weight: 220 parts of waste marble powder, 220 parts of mineral powder, 150 parts of sodium silicate aqueous solution, 30 parts of sodium hydroxide particles and 100 parts of water;
(2) adding waste marble powder and mineral powder into a stirring pot, and stirring at a low speed for 2min to prepare mixed powder;
(3) uniformly mixing water and an alkali activator to prepare a mixed alkali solution;
(4) and adding the mixed alkali liquor into the stirring kettle, and stirring at a low speed for 2min to obtain the high-content waste marble powder-slag-based alkali-activated cementing material.
In the steps (2) and (4), the low-speed stirring means that the stirring speed is 140 +/-5 revolutions per minute.
In the first to third embodiments, all raw materials except the waste marble powder from the stone processing plant can be purchased in commercial sources.
In order to detect the strength of the high-doped waste marble powder-slag-based alkali-activated cementing material, according to the national standard GB/T17671-2021 cement mortar strength test method (ISO method), the high-doped waste marble powder-slag-based alkali-activated cementing material prepared in the first to third embodiments is respectively and uniformly stirred with 1550 parts by weight of Chinese ISO standard sand to obtain alkali-activated mortar, the mortar is poured into a mold and vibrated to be compact, a plastic film is covered on the mold, the mold is placed indoors and is disassembled after 24 hours to obtain a mortar test piece, then the mortar test piece is placed in a curing box for curing, the temperature in the curing box is 20 +/-2 ℃, and the relative humidity is more than or equal to 95%. The flexural strength and the compressive strength of the mortar test pieces 3d, 7d and 28d were measured, and the measurement results are shown in the attached table I.
Attached watch 1
As can be seen from the attached table I, the high-content waste marble powder-slag-based alkali-activated cementing materials prepared in the first to third embodiments have good fluidity, and the initial setting time meets the specification that the portland cement is more than or equal to 45min in the existing specification, and can meet the construction requirements. The invention selects the proper alkali activator, in the embodiment that the mixing amount of the waste marble powder is up to 72.7 percent, the compressive strength at the age of 28d reaches more than 42.5MPa, and meets the requirement of Portland cement with the label P.II 42.5R, and the invention can greatly improve the resource utilization rate of the waste marble powder.
Example four to example eight
The raw materials used in the high-content waste marble powder-slag-based alkali-activated cementing material are the same as those in the first to third examples, except that the specific content, namely the weight part, is changed, and the specific details are shown in the attached table II.
And B, attaching a table II: EXAMPLES IV TO EI, the raw material contents are shown in the table (in parts by weight)
As a variation of examples one to eight, the highly doped waste marble dust-slag based alkali-activated cementitious material generally comprises, in parts by weight: 220-320 parts of waste marble powder, 120-220 parts of mineral powder, 150-250 parts of alkali activator and 80-130 parts of water.
As a further variation of the first to eighth embodiments, the basic parameters of the waste marble powder are generally: caO is more than or equal to 50wt%, ignition loss is more than or equal to 38wt%, and specific surface area is more than or equal to 1m 2 /g。
As another variation of the first to eighth embodiments, the basic parameters of the S95 ore powder are generally: caO more than or equal to 50wt%, siO 2 ≥20wt%，Al 2 O 3 More than or equal to 10wt%, the ignition loss is more than or equal to 0.6wt%, and the specific surface area is more than or equal to 0.4m 2/g.
As a further variation of examples one to eight, the chemical composition and content of the aqueous sodium silicate solution is: siO2 is more than or equal to 25wt%, na2O is more than or equal to 6wt%, and the modulus of the sodium silicate aqueous solution is 3.0-3.8; the mass fraction ratio of the sodium silicate aqueous solution to the sodium hydroxide particles is (3-5) to 1.
Claims (9)
1. A high-doped waste marble powder-slag-based alkali-activated cementing material is characterized in that: the material comprises the following raw materials in parts by weight: 220-320 parts of waste marble powder, 120-220 parts of mineral powder, 150-250 parts of alkali activator and 80-130 parts of water.
2. The highly-doped waste marble powder-slag-based alkali-activated cementitious material as claimed in claim 1, wherein: the basic parameters of the waste marble powder are as follows: caO is more than or equal to 50wt%, ignition loss is more than or equal to 38wt%, and specific surface area is more than or equal to 1m 2 /g。
3. The highly-doped waste marble powder-slag-based alkali-activated cementitious material as claimed in claim 1, wherein: the mineral powder is S95 mineral powder, and the basic parameters of the S95 mineral powder are as follows: caO is more than or equal to 50wt%, siO 2 ≥20wt%，Al 2 O 3 More than or equal to 10wt%, ignition loss more than or equal to 0.6wt%, and specific surface area more than or equal to 0.4m 2 /g。
4. The high-doped waste marble powder-slag-based alkali-activated cement of claim 1, wherein: the alkali activator is a mixed solution of sodium silicate aqueous solution and sodium hydroxide particles, and the sodium silicate aqueous solution comprises the following chemical components in percentage by weight: siO2 2 ≥25wt%，Na 2 O is more than or equal to 6wt%, and the modulus of the sodium silicate aqueous solution is 3.0-3.8; the mass fraction ratio of the sodium silicate aqueous solution to the sodium hydroxide particles is (4-6) to 1.
5. A preparation method of a high-doped waste marble powder-slag-based alkali-activated cementing material is characterized by comprising the following steps of: the method comprises the following steps:
(1) weighing the following materials in parts by weight: 220-320 parts of waste marble powder, 120-220 parts of mineral powder, 150-250 parts of alkali activator and 80-130 parts of water;
(2) adding the waste marble powder and the mineral powder into a stirring pot, and stirring at a low speed for 1-3 min to prepare mixed powder;
(3) uniformly mixing an alkali activator and water to prepare a mixed alkali liquor;
(4) and adding the mixed alkali liquor into the stirring pot, and stirring at a low speed for 1-3 min to prepare the high-doped waste marble powder-slag-based alkali-activated cementing material.
6. The method for preparing a highly-doped waste marble powder-slag-based alkali-activated cement according to claim 5, wherein: the basic parameters of the waste marble powder are as follows: caO is more than or equal to 50wt%, ignition loss is more than or equal to 38wt%, and specific surface area is more than or equal to 1m 2 /g。
7. The method for preparing a highly-doped waste marble powder-slag-based alkali-activated cement according to claim 5, wherein: the mineral powder is S95 mineral powder, and the basic parameters of the S95 mineral powder are as follows: caO more than or equal to 50wt%, siO 2 ≥20wt%，Al 2 O 3 More than or equal to 10wt%, ignition loss more than or equal to 0.6wt%, and specific surface area more than or equal to 0.4m 2 /g。
8. The method for preparing a highly-doped waste marble powder-slag-based alkali-activated cement according to claim 5, wherein: the alkali activator is a mixed solution of a sodium silicate aqueous solution and sodium hydroxide particles, and the sodium silicate aqueous solution comprises the following chemical components in percentage by weight: siO2 2 ≥25wt%，Na 2 O is more than or equal to 6wt%, and the modulus of the sodium silicate aqueous solution is 3.0-3.8; the mass fraction ratio of the sodium silicate aqueous solution to the sodium hydroxide particles is (4-6) to 1.
9. The method for preparing a highly-doped waste marble powder-slag-based alkali-activated cement according to claim 5, wherein: in the steps (2) and (4), the low-speed stirring means that the stirring speed is 140 +/-5 revolutions per minute.
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