CN115745555A - Quick-hardening type alkali-activated gypsum-slag-based high-flow concrete and preparation method thereof - Google Patents
Quick-hardening type alkali-activated gypsum-slag-based high-flow concrete and preparation method thereof Download PDFInfo
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- 239000003513 alkali Substances 0.000 title claims abstract description 55
- 239000004567 concrete Substances 0.000 title claims abstract description 49
- 239000002893 slag Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title abstract description 9
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical class O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 65
- 239000012190 activator Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 21
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 17
- 239000011707 mineral Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 14
- 239000002699 waste material Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000001354 calcination Methods 0.000 claims abstract description 5
- 238000000227 grinding Methods 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000000395 magnesium oxide Substances 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical group [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims description 2
- 239000002562 thickening agent Substances 0.000 claims description 2
- 239000012452 mother liquor Substances 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 10
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract description 5
- 239000002440 industrial waste Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 20
- 238000010276 construction Methods 0.000 description 9
- 239000004568 cement Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 4
- 239000004566 building material Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
- 239000000347 magnesium hydroxide Substances 0.000 description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 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
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete additives, in particular to a quick-hardening alkali-activated gypsum-slag-based high-flow concrete and a preparation method thereof, wherein the raw materials of the quick-hardening alkali-activated gypsum-slag-based high-flow concrete comprise mineral powder, modified phosphogypsum, an alkali activator, machine-made sand, coarse aggregate, water and an additive; the modified phosphogypsum is prepared by mixing waste phosphogypsum and an alkaline improver, calcining at 700-1000 ℃ to obtain alpha-type phosphogypsum and beta-type phosphogypsum, and grinding into powder to obtain the modified phosphogypsum with the specific surface area of 800-1100 m 2 Modified phosphogypsum per kg. The quick-hardening alkali-activated gypsum-slag-based high-flow concrete cementing material adopts industrial waste materials, namely phosphogypsum and phosphogypsumSlag provides a new solution for the problems of industrial solid waste stacking and resource utilization, and has great potential for replacing common silicate concrete to be applied to engineering.
Description
Technical Field
The invention relates to the field of building materials, in particular to quick-hardening alkali-activated gypsum-slag-based high-flow concrete and a preparation method thereof.
Background
At present, the building material industry is subjected to multiple limitations from the aspects of resources, energy, environmental protection and the like, the development speed of the building material industry is greatly limited, and in order to meet the ever-increasing requirements of engineering construction, a new method is needed in the building material industry, and novel materials are vigorously developed so as to meet the requirements of the engineering construction on the premise of ensuring the sustainable development. Compared with silicate cement, the alkali slag cement has the advantages of low heat of hydration, high strength, good durability and the like, and shows good development and application prospects in the aspects of civil engineering, nuclear fixation and solid waste, high strength, sealing, high-temperature materials and the like. Because the price of metakaolin is higher, the preparation of the alkali-activated composite cementing material by partially or completely replacing metakaolin with various industrial waste residues, such as fly ash, slag, furnace slag, tailings and other aluminosilicate materials, becomes a research hotspot at home and abroad in recent years.
Disclosure of Invention
In order to solve the problems of high cost, long setting time and mineral admixture resource shortage of the existing high-flow concrete in the background art, the invention provides a quick-hardening alkali-activated gypsum-slag-based high-flow concrete, wherein the raw materials comprise mineral powder, modified phosphogypsum, an alkali activator, machine-made sand, coarse aggregate, water and an additive;
the modified phosphogypsum is prepared by mixing waste phosphogypsum and an alkaline improver, calcining at 700-1000 ℃ to obtain alpha-type phosphogypsum and beta-type phosphogypsum, and grinding into powder to obtain the modified phosphogypsum with the specific surface area of 800-1100 m 2 Modified phosphogypsum per kg.
The modified phosphogypsum is prepared by modifying industrial byproducts for producing phosphoric acid, and is prepared by simply mixing waste phosphogypsum and alkaline improver to neutralize residual acidic substances, calcining at 700-1000 ℃ to remove organic substances and easily-decomposed substances, activating gypsum crystals to obtain alpha-type and beta-type phosphogypsum, and grinding into powder to obtain the phosphogypsum with the specific surface area of 800-1100 m 2 The modified phosphogypsum of/kg can be ground by a planetary ball mill, but other ball mills can also be adopted.
In addition, the invention mainly utilizes the modification method to ensure that the obtained alpha-type and beta-type modified phosphogypsum can meet the use conditions of the invention, and although the waste phosphogypsum from different sources has certain difference by the production process or composition, the influence of the factors on the performance of the finished concrete finally prepared by the invention can be controlled within 5 percent.
On the basis of the scheme, the mass ratio of the waste phosphogypsum to the alkalinity improver is 90-100: 3 to 5.
On the basis of the scheme, the alkaline improver is paraffin, carbide slag, limestone and sodium hydroxide according to a mass ratio of 9-7: 13 to 10:15 to 9:1 to 0.6.
On the basis of the scheme, the modified phosphogypsum-containing additive further comprises 60-80 parts of mineral powder, 10-20 parts of modified phosphogypsum, 6-7.5 parts of alkali activator, 95-120 parts of machine-made sand, 130-160 parts of coarse aggregate, 23-27 parts of water and 0.8-1.2 parts of additive in parts by weight.
On the basis of the scheme, the activity level of the ore powder is not lower than S95 level, and the alkalinity coefficient is greater than 1, and the mass coefficient is greater than 1.2.
On the basis of the scheme, the alkali-activator is magnesium oxide, the mass content of the alkali-activator is higher than 90%, and industrial-grade magnesium oxide can be adopted.
On the basis of the scheme, the fineness of the machine-made sand is 2.3-2.7, and the apparent density is not lower than 2500kg/m 3 。
On the basis of the scheme, the coarse aggregate is impact broken stone with the grain diameter of 5-20 mm.
On the basis of the scheme, the additive is a polycarboxylic acid water reducing agent which is prepared by compounding a polycarboxylic acid mother solution, a retarder, a thickening agent and an air entraining agent and has the water reducing rate of 30-34%.
The invention also provides a preparation method of the quick-hardening alkali-activated gypsum-slag-based high-flow concrete, which comprises the following steps:
(1) Mixing mineral powder, modified phosphogypsum, an alkali activator, machine-made sand and coarse aggregate, and then uniformly stirring to form a mixture A;
mixing the additive and water, and uniformly stirring to obtain a mixed solution B;
(2) And pouring the mixture A into a stirrer to be stirred for 90-120 s, adding the mixed solution B to be stirred for 240-480 s, and obtaining the fast-hardening alkali-activated gypsum-slag-based high-fluidity concrete.
Compared with the prior art, the quick-hardening alkali-activated gypsum-slag-based high-flow concrete provided by the invention has the following technical principles and beneficial effects:
(1) The quick-hardening alkali-activated gypsum-slag-based high-flow concrete utilizes a mechanical force chemical activation technology and an alkali-activated activation technology to modify industrial solid waste phosphogypsum, magnesium oxide and water are combined under a certain condition to generate magnesium hydroxide, the magnesium hydroxide is in a slightly alkaline reaction, the pH value of a saturated aqueous solution of the magnesium hydroxide is 10.3, and the modified phosphogypsum and slag release active silicon-aluminum substances under the condition so as to enable OH to be OH - And Mg 2+ With the active substance SiO 2 、Al 2 O 3 The zeolite-like and tobermorite-like are generated, the mechanical strength can be greatly improved, the utilization rate of solid wastes is improved, and the industrial solid waste recycling is realized.
(2) The alkali activator can form hydrated gel together with modified phosphogypsum and mineral powder, can accelerate the coagulation speed, and has good later strength development.
(3) The quick-hardening alkali-activated gypsum-slag-based high-flow concrete has the characteristic of short setting time, can be set within 30-50 min, has a short construction period, and can greatly improve the construction efficiency.
(4) The quick-hardening alkali-activated gypsum-slag-based high-flow-state concrete has the characteristics of high expansion degree and good flow state, the concrete slump/expansion degree of the quick-hardening alkali-activated gypsum-slag-based high-flow-state concrete can reach more than 210mm/620mm, and compared with common silicate concrete, the quick-hardening alkali-activated gypsum-slag-based high-flow-state concrete is more suitable for special-shaped molds and can be automatically leveled only by simple vibration.
(5) The quick-hardening alkali-activated gypsum-slag-based high-flow concrete cementing material adopts industrial waste materials, namely phosphogypsum and slag, provides a new solution for the problems of industrial solid waste stacking and resource utilization, and has great potential for replacing common silicate concrete to be applied to engineering.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following description will clearly and completely describe the embodiments of the present invention, and obviously, the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention also provides the following embodiments:
example 1
The raw materials comprise the following components in parts by weight: 70 parts of mineral powder and 1000m of specific surface area 2 20 parts of modified phosphogypsum per kg, 100 parts of machine-made sand, 130 parts of coarse aggregate, 7.5 parts of alkali activator, 24 parts of tap water and 0.90 part of polycarboxylic acid water reducing agent.
Example 2
The raw materials comprise the following components in parts by weight: 80 parts of mineral powder and 900m of specific surface area 2 18 parts of modified phosphogypsum per kg, 115 parts of machine-made sand, 130 parts of coarse aggregate, 7 parts of alkali activator, 26 parts of tap water and 1 part of polycarboxylic acid water reducing agent.
Example 3
The raw materials comprise the following components in parts by weight: 65 parts of mineral powder and 1100m of specific surface area 2 13 parts of modified phosphogypsum per kg, 105 parts of machine-made sand, 140 parts of coarse aggregate, 8 parts of alkali activator, 23 parts of tap water and 0.80 part of polycarboxylic acid water reducing agent.
The raw material component parameters or the preparation method of the embodiment are as follows:
the activity level of the mineral powder is not lower than S95 level, and the alkalinity coefficient is more than 1, and the mass coefficient is more than 1.2.
The preparation method of the modified phosphogypsum comprises the following steps of mixing the waste phosphogypsum which is an industrial byproduct for producing phosphoric acid and an alkaline improver according to the mass ratio of 100:3 to 90:5, then calcining at 700-1000 ℃ to obtain alpha-type and beta-type phosphogypsum, and finally grinding by adopting a planetary ball mill to obtain the phosphogypsum with the specific surface area of 800-1100 m 2 Per kg ofThe modified phosphogypsum is prepared from alkaline improver paraffin, carbide slag, limestone and sodium hydroxide according to the mass ratio of 9:13:15:1 by mixing.
The phosphogypsum of the example 1 is waste phosphogypsum from a certain solid waste piling plant in Guizhou, the phosphogypsum of the example 2 is waste by-product from a certain phosphoric acid production plant in Guizhou, and the phosphogypsum of the example 3 is waste phosphogypsum from a certain commercial concrete mixing plant in Xiamen city.
The fineness of the machine-made sand is 2.3-2.7, and the apparent density is not lower than 2500kg/m 3 。
The alkali activator is industrial-grade magnesium oxide, and the mass content of the alkali activator is higher than 90 percent. .
The coarse aggregate is impact broken stone with the grain diameter of 5-20 mm.
The polycarboxylate superplasticizer is S13 type superplasticizer of Kejie New materials group Co.
The preparation method of the above example is as follows:
(1) Mixing mineral powder, modified phosphogypsum, an alkali activator, machine-made sand and coarse aggregate, and then uniformly stirring to form a mixture A;
and mixing the polycarboxylic acid water reducing agent and tap water, and uniformly stirring to obtain a mixed solution B.
(2) And pouring the mixture A into a stirrer for stirring for 90-120 s, adding the mixed solution B, and stirring for 240-480 s to obtain the fast-hardening alkali-activated gypsum-slag-based high-flow concrete.
The invention also provides the following comparative examples
Comparative example 1
This comparative example differs from example 1 only in that the cement of example 1 (which is composed of powdered ore and has a specific surface area of 1000 m) is replaced by a mass of Portland cement (P.O 42.5) 2 Kg of modified phosphogypsum and alkali activator), the rest being in accordance with example 1.
Comparative example 2
This comparative example differs from example 2 only in that a cement (cement of the same) such as ordinary portland cement (P · O42.5) was used in place of the cement of example 2 in qualityThe material consists of mineral powder and has a specific surface area of 900m 2 /kg modified phosphogypsum with alkali activator), otherwise identical to example 2.
Comparative example 3
This comparative example differs from example 3 only in that a mass of Portland cement (P.O 42.5) was used instead of the cement of example 3 (the cement was composed of ore fines, having a specific surface area of 1100 m) 2 Kg modified phosphogypsum and alkali activator), otherwise identical to example 3.
Comparative example 4
This comparative example differs from example 2 only in that the gypsum used was phosphogypsum which had not been modified by treatment and which was used as an equivalent mass to replace the 900m specific surface area of example 2 2 Per kg of modified phosphogypsum, otherwise identical to example 2.
Comparative example 5
This comparative example is different from example 2 only in that the alkali activator used is sodium hydroxide, and the magnesium oxide in example 2 is replaced with sodium hydroxide or the like, and the others are the same as example 2.
It should be noted that the specific parameters or some reagents in the above embodiments are specific examples or preferred embodiments under the concept of the present invention, and are not limited thereto; those skilled in the art can adapt the same within the spirit and scope of the present invention.
The quick-hardening alkali-activated gypsum-slag-based high-flow concrete prepared by the above method is subjected to standard: GB/T50080 Standard for testing the Performance of common concrete mixtures, GB/T50081 Standard for testing the mechanical Properties of common concrete and GB/T50107 Standard for testing and evaluating the Strength of concrete, the results are shown in Table 1:
TABLE 1
| Performance test items | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Extension/mm | 640 | 665 | 625 | 540 | 550 | 525 | 600 | 460 |
| Slump/mm | 255 | 260 | 230 | 205 | 220 | 190 | 200 | 155 |
| Coagulation time/min | 80 | 95 | 76 | 164 | 180 | 158 | 103 | 49 |
| 28d compressive strength/MPa | 59.3 | 66.6 | 62.4 | 55.2 | 60.8 | 56.3 | 48.7 | 53.2 |
As can be seen from the test results and comparative examples in Table 1, the concrete provided by the invention has the advantages of fast setting time, high expansion degree, good fluidity, high 28d compressive strength, and can effectively shorten the construction time and improve the construction efficiency, and is better suitable for special-shaped mold construction or vibration-free construction.
Compared with the comparative examples 1, 2 and 3, the concrete prepared by the embodiment has the advantages that the expansion degree can be increased by 90-115 mm, and the setting time can be shortened by 70-90 min under the same conditions, so that the cementing material (composed of mineral powder, modified phosphogypsum and alkali activator) is expected to replace common portland cement, promote the reclamation of industrial solid wastes, and is expected to be applied to projects with short construction period and high requirements on fluidity. Compared with the common silicate concrete, the concrete provided by the invention is more suitable for special-shaped molds, and can be automatically leveled only by simple vibration.
The combination of the comparative example 4 shows that the modification treatment of the waste phosphogypsum can greatly improve the gelling activity of the waste phosphogypsum, so that the waste phosphogypsum can be applied to preparing high-flow concrete and the utilization rate of solid wastes is improved.
From the results of comparative example 5, it can be seen that the invention adopts magnesium oxide as the alkali-activator, and can significantly improve the comprehensive properties of the finished concrete.
In conclusion, the quick-hardening alkali-activated gypsum-slag-based high-flow concrete provided by the invention has the characteristics of high expansion degree and good flow state, the cementing materials are all industrial waste materials, namely phosphogypsum and slag, a new solution is provided for the problems of industrial solid waste stacking and resource utilization, and the quick-hardening alkali-activated gypsum-slag-based high-flow concrete has great potential for replacing common silicate concrete to be applied to engineering.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The quick-hardening alkali-activated gypsum-slag-based high-flow concrete is characterized in that raw materials comprise mineral powder, modified phosphogypsum, an alkali activator, machine-made sand, coarse aggregate, water and an additive;
the modified phosphogypsum is prepared by mixing waste phosphogypsum and an alkaline improver, calcining at 700-1000 ℃ to obtain alpha-type phosphogypsum and beta-type phosphogypsum, and grinding into powder to obtain the modified phosphogypsum with the specific surface area of 800-1100 m 2 Per kg of modified phosphogypsum.
2. The rapid hardening type alkali-activated gypsum-slag-based high-flow concrete according to claim 1, wherein: the mass ratio of the waste phosphogypsum to the alkaline improver is 90-100: 3 to 5.
3. The rapid hardening type alkali-activated gypsum-slag-based high-flow concrete according to claim 1, wherein: the alkaline improver is paraffin, carbide slag, limestone and sodium hydroxide according to a mass ratio of 9-7: 13 to 10:15 to 9:1 to 0.6.
4. The fast hardening type alkali-activated gypsum-slag-based high-fluidity concrete according to claim 3, wherein: the modified phosphogypsum-containing material comprises, by weight, 60-80 parts of mineral powder, 10-20 parts of modified phosphogypsum, 6-7.5 parts of alkali activator, 95-120 parts of machine-made sand, 130-160 parts of coarse aggregate, 23-27 parts of water and 0.8-1.2 parts of additive.
5. The quick-hardening alkali-activated gypsum-slag-based high-flow concrete according to claim 1, wherein: the activity level of the mineral powder is not lower than S95 level, and the alkalinity coefficient is more than 1, and the mass coefficient is more than 1.2.
6. The quick-hardening alkali-activated gypsum-slag-based high-flow concrete according to claim 1, wherein: the alkali activator is magnesium oxide, and the mass content of the alkali activator is higher than 90%.
7. The quick-hardening alkali-activated gypsum-slag-based high-flow concrete according to claim 1, wherein: the fineness of the machine-made sand is 2.3-2.7, and the apparent density is not lower than 2500kg/m 3 。
8. The quick-hardening alkali-activated gypsum-slag-based high-flow concrete according to claim 7, wherein: the coarse aggregate is impact broken stone with the grain diameter of 5-20 mm.
9. The quick-hardening alkali-activated gypsum-slag-based high-flow concrete according to claim 1, wherein: the additive is a polycarboxylic acid water reducing agent which is prepared by compounding a polycarboxylic acid mother liquor, a retarder, a thickening agent and an air entraining agent and has the water reducing rate of 30-34%.
10. A method for preparing a fast hardening type alkali-activated gypsum-slag-based high-fluidity concrete according to any one of claims 1 to 9, comprising the steps of:
(1) Mixing mineral powder, modified phosphogypsum, an alkali activator, machine-made sand and coarse aggregate, and then uniformly stirring to form a mixture A;
mixing the additive and water, and uniformly stirring to obtain a mixed solution B;
(2) And pouring the mixture A into a stirrer to be stirred for 90-120 s, adding the mixed solution B to be stirred for 240-480 s, and obtaining the fast-hardening alkali-activated gypsum-slag-based high-fluidity concrete.
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| CN105645804A (en) * | 2015-12-29 | 2016-06-08 | 中建商品混凝土有限公司 | Composite powder for cement concrete |
| CN106630882A (en) * | 2015-11-04 | 2017-05-10 | 北京高能时代环境技术股份有限公司 | Medium/high-strength concrete prepared from modified phosphogypsum based binding material and manufacturing method of concrete |
| CN108947449A (en) * | 2018-09-05 | 2018-12-07 | 江苏夫科技股份有限公司 | A kind of ardealite ultra-sulphate cement and preparation method thereof |
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