CN115650649A - C80 solid waste concrete and preparation method thereof - Google Patents
C80 solid waste concrete and preparation method thereof Download PDFInfo
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- CN115650649A CN115650649A CN202211062243.9A CN202211062243A CN115650649A CN 115650649 A CN115650649 A CN 115650649A CN 202211062243 A CN202211062243 A CN 202211062243A CN 115650649 A CN115650649 A CN 115650649A
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- 239000004567 concrete Substances 0.000 title claims abstract description 71
- 239000002910 solid waste Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000002131 composite material Substances 0.000 claims abstract description 47
- 239000002893 slag Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 26
- 239000010440 gypsum Substances 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 20
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 20
- 239000011707 mineral Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000002253 acid Substances 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000004576 sand Substances 0.000 claims abstract description 13
- 238000013329 compounding Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 11
- 238000006477 desulfuration reaction Methods 0.000 claims description 10
- 230000023556 desulfurization Effects 0.000 claims description 10
- 239000000654 additive Substances 0.000 claims description 6
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000006227 byproduct Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000007246 mechanism Effects 0.000 abstract description 10
- 238000003723 Smelting Methods 0.000 abstract description 6
- 239000002159 nanocrystal Substances 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 9
- 239000000047 product Substances 0.000 description 7
- 239000011265 semifinished product Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000011178 precast concrete Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application relates to C80 solid waste concrete and a preparation method thereof, wherein the concrete comprises the following components in parts by weight: 134 to 140 portions of water, 265 to 277 portions of cement, 184 to 200 portions of composite admixture, 780 to 800 portions of tailing manufactured sand, 215 to 230 portions of graded 5 to 15 tailing mechanism coarse aggregate, 863 to 875 portions of graded 5 to 25 tailing mechanism coarse aggregate and 4.6 to 5.0 portions of polycarboxylic acid water reducer. Wherein the composite admixture is prepared by proportionally compounding mineral powder, steel slag, desulfurized gypsum and nanocrystalline core type early strength agent. The C80 solid waste concrete is excellent in strength, a large amount of doped composite admixture fully utilizes the smelting slag solid waste such as steel slag, mineral powder and desulfurized gypsum, and is matched with the composite admixture prepared by the nano crystal nucleus in a gun machine to replace 40% of cement in concrete, so that the activity of the composite admixture is completely excited under the steam curing condition, the early strength of a concrete system is improved, the combination of smelting slag resources and steam curing concrete prefabricated component products is promoted, and the cost is greatly reduced.
Description
Technical Field
The application relates to the technical field of building materials, in particular to C80 solid waste concrete and a preparation method thereof.
Background
With the acceleration of basic facilities such as buildings, roads, railways, bridges and the like and the urbanization construction in China, the rapid development of city reconstruction and building industry, the service life of some old buildings, structures and city basic facilities is removed due to the end, more and more construction wastes are generated, and the share of concrete is the largest. The traditional treatment method of the construction waste is stacking or landfill, which not only occupies a large amount of cultivated land, but also causes environmental pollution. In addition, in the production process of concrete, the aggregate accounts for about 75% of the total amount of concrete, and it is increasingly difficult to ensure high-quality aggregate supply as ore resources tend to be depleted.
The steel industry is one of the main emission sources of solid wastes of a large amount of industries in China, and particularly, the steel slag is used as waste slag discharged in the steel making process, and the quantity of the waste slag is about 15% -20% of the yield of crude steel. However, the current situation is that the comprehensive utilization of water granulated slag, fly ash and other resources in the waste slag discharged from steel plants is relatively mature, and the main reason for restricting the overall utilization level of steel smelting slag is steel slag. The problems of low comprehensive utilization of steel slag, low grade of steel slag products, high steel slag treatment cost and the like generally exist in steel slag in China, and the overall level of the comprehensive utilization industry of smelting slag is seriously hindered.
The steam curing process adopted in the concrete industry at present mainly has two directions, one is a pressure-steaming-free production process of a concrete prefabricated pipe pile, and the steam curing process at 80-90 ℃ is adopted. The other is a winter steam curing production process of the prefabricated member, which adopts a production process at 50-60 ℃. The steam curing process can effectively improve the early strength development of concrete and improve the turnover efficiency of the mould. However, the concrete generally needs a large amount of cement, so that the preparation cost of the concrete is high.
Disclosure of Invention
In view of the above, there is a need to provide a low-cost C80 solid waste concrete and a preparation method thereof.
In a first aspect, the present application provides a C80 solid waste concrete, where the C80 solid waste concrete is composed of the following raw materials in parts by weight: 134 to 140 portions of water, 265 to 277 portions of cement, 184 to 200 portions of composite admixture, 780 to 800 portions of tailing machine-made sand, 215 to 230 portions of graded 5 to 15 tailing machine-made coarse aggregate, 863 to 875 portions of graded 5 to 25 tailing machine-made coarse aggregate and 4.6 to 5.0 portions of polycarboxylic acid water reducer;
wherein the composite admixture is prepared by proportionally compounding mineral powder, steel slag, desulfurized gypsum and nanocrystalline core type early strength agent.
In one embodiment, the mineral powder accounts for 45-55 wt%, the steel slag accounts for 25-30 wt%, the desulfurized gypsum accounts for 15-20 wt%, and the nanocrystalline core type early strength agent accounts for 3-5 wt%.
In one embodiment, the 1d steam curing activity index of the composite admixture is more than 120%, and the 3d steam curing activity index is more than 130%.
In one embodiment, the solid waste doping amount in the composite admixture is more than 60wt%, the total solid waste doping amount in the C80 solid waste concrete is more than 70wt%, the 1d steam-cured strength of the C80 solid waste concrete is more than 80MPa, and the 3d steam-cured strength is more than 90MPa.
In one embodiment, the specific surface area of the steel slag is more than 400m 2 Kg, the 7d activity index is 55-65%, and the 28d activity index is 65-75%.
In one embodiment, the gypsum is industrial desulfurization byproduct gypsum, wherein calcium sulfate dihydrate is selected as a raw material for industrial desulfurization, and the content of the calcium sulfate dihydrate is more than 80% before industrial desulfurization.
In a second aspect, the present application provides a method for preparing C80 solid waste concrete, for preparing the C80 solid waste concrete of the first aspect of the present application, the method comprising:
fully mixing 45-55 wt% of mineral powder, 25-30 wt% of steel slag, 15-20 wt% of desulfurized gypsum and 3-5 wt% of nanocrystalline core type early strength agent to obtain a composite admixture;
putting 265-277 parts by weight of cement, 184-200 parts by weight of the composite admixture, 780-800 parts by weight of tailing machine-made sand, 215-230 parts by weight of graded 5-15 tailing machine-made coarse aggregate, 863-875 parts by weight of graded 5-25 tailing machine-made coarse aggregate and 4.6-5.0 parts by weight of a polycarboxylic acid water reducer into a mixing container in sequence according to the feeding sequence, and carrying out dry stirring to obtain a first mixture;
adding 134-140 parts by weight of water and an additive into the first mixture twice, and stirring each time the water and the additive are added to obtain a second mixture;
standing the second mixture after the second mixture is formed, then placing the second mixture in a steam quick curing box, setting the temperature to be increased to 80 ℃ within a specified time, and carrying out constant-temperature curing to obtain a third mixture;
and cooling the third mixture to room temperature, taking out the third mixture, and removing the mold to obtain C80 solid waste concrete.
In one embodiment, the step of placing the second mixture after the second mixture is formed and standing in a steam fast curing box, and setting the temperature to be increased to 80 ℃ for a specified time and curing at a constant temperature comprises the following steps:
standing for 4h, placing in the steam rapid curing box, setting the temperature for 1h and 20min, heating to 80 ℃, and curing at constant temperature for 6h.
The C80 solid waste concrete and the preparation method thereof are characterized in that 265-277 parts by weight of cement, 184-200 parts by weight of composite admixture prepared by fully mixing 45-55 wt% of mineral powder, 25-30 wt% of steel slag, 15-20 wt% of desulfurized gypsum and 3-5 wt% of nanocrystalline nucleation type early strength agent, 780-800 parts by weight of tailing machine-made sand, 215-230 parts by weight of graded 5-15 tailing machine-made coarse aggregate, 863-875 parts by weight of graded 5-25 tailing machine-made coarse aggregate and 4.6-5.0 parts by weight of polycarboxylic acid water reducer are put into a mixing container and are subjected to dry stirring, 134-140 parts by weight of water and additives are added twice, and finally constant temperature maintenance is carried out through a steam quick maintenance box, so that the prepared C80 solid waste concrete has excellent strength, a large amount of composite admixture is doped, the solid waste of smelting slag such as the steel slag, the desulfurized gypsum and the like are fully utilized, the composite admixture prepared by a nano-meter crystal nucleus machine replaces 40% of concrete, the composite admixture is completely maintained under the condition, and the early stage maintenance of the composite admixture is greatly improved, and the active reinforcement of the prefabricated concrete is greatly combined with the prefabricated structural component.
Drawings
Fig. 1 is a flow chart of a method for preparing C80 solid waste concrete according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The use of the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like in the description of the present application is for purposes of illustration only and is not intended to represent the only embodiment.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of this application, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In one embodiment, the C80 solid waste concrete is composed of the following raw materials in parts by weight: 134 to 140 portions of water, 265 to 277 portions of cement, 184 to 200 portions of composite admixture, 780 to 800 portions of tailing ore-made sand, 215 to 230 portions of graded 5 to 15 tailing machine-made coarse aggregate, 863 to 875 portions of graded 5 to 25 tailing machine-made coarse aggregate and 4.6 to 5.0 portions of polycarboxylic acid water reducer.
Wherein the composite admixture is prepared by proportionally compounding mineral powder, steel slag, desulfurized gypsum and nanocrystalline core type early strength agent.
In the embodiment, the composite admixture comprises 45-55 wt% of mineral powder, 25-30 wt% of steel slag, 15-20 wt% of desulfurized gypsum and 3-5 wt% of nanocrystalline core type early strength agent, wherein the wt% is weight percentage.
The composite admixture has a 1d steam curing activity index of more than 120 percent and a 3d steam curing activity index of more than 130 percent. The total solid waste mixing amount in the C80 solid waste concrete is more than 70wt%, the 1d steam-curing strength of the C80 solid waste concrete is more than 80MPa, the 3d steam-curing strength is more than 90MPa, and the specific surface area of the steel slag is more than 400m 2 The activity index of 7d is 55-65%, and the activity index of 28d is 65-75%. The gypsum is the byproduct gypsum of industrial desulfurization, wherein, the industrial desulfurization selects calcium sulfate dihydrate as raw material, and before the industrial desulfurization, the calcium sulfate dihydrate is used as the raw materialThe content is more than 80 percent.
As shown in fig. 1, in one embodiment, a method for preparing C80 solid waste concrete comprises the following steps:
step S110, mixing 45-55 wt% of mineral powder, 25-30 wt% of steel slag, 15-20 wt% of desulfurized gypsum and 3-5 wt% of nanocrystalline core type early strength agent fully to obtain the composite admixture.
Specifically, 45-55 wt% of mineral powder, 25-30 wt% of steel slag, 15-20 wt% of desulfurized gypsum and 3-5 wt% of nanocrystalline core type early strength agent are put into a mixing container to be fully mixed.
Step S120, putting 265-277 parts by weight of cement, 184-200 parts by weight of composite admixture, 780-800 parts by weight of tailing machine-made sand, 215-230 parts by weight of graded 5-15 tailing machine-made coarse aggregate, 863-875 parts by weight of graded 5-25 tailing machine-made coarse aggregate and 4.6-5.0 parts by weight of polycarboxylic acid water reducer into a mixing container in sequence according to the feeding sequence, and performing dry stirring to obtain a first mixture.
Specifically, 265-277 parts by weight of cement, 184-200 parts by weight of the composite admixture prepared in step S110, 780-800 parts by weight of tailing machine-made sand, 215-230 parts by weight of graded 5-15 tailing machine-made coarse aggregate, 863-875 parts by weight of graded 5-25 tailing machine-made coarse aggregate and 4.6-5.0 parts by weight of polycarboxylic acid water reducer are sequentially added into a mixing container according to the feeding sequence and are subjected to dry stirring.
And S130, adding 134 to 140 parts by weight of water and the admixture into the first mixture twice, and stirring the mixture every time the water and the admixture are added to obtain a second mixture.
Specifically, after the first mixture is obtained in step S120, 134 to 140 parts by weight of water and the admixture are added to the mixing vessel twice, the first addition of the water and the admixture is followed by continuous stirring to uniformly coat the slurry on the surface of the aggregate, and the second addition of the remaining water and the admixture is followed by continuous stirring and then discharged from the mixing vessel, thereby obtaining a second mixture.
And step S140, standing the formed second mixture, then placing the second mixture in a steam quick curing box, raising the temperature to 80 ℃ within the set time, and carrying out constant-temperature curing to obtain a third mixture.
In this example, after the second mixture was molded, it was left to stand for 4 hours, and then placed in a steam rapid curing oven, and the temperature was set to 1 hour and 20 minutes, raised to 80 ℃ and maintained at constant temperature for 6 hours.
And S150, cooling the third mixture to room temperature, taking out the third mixture, and removing the mold to obtain C80 solid waste concrete.
Specifically, the third mixture prepared in step S140 is cooled to room temperature, and then taken out and demolded to obtain C80 solid waste concrete.
The C80 solid waste concrete and the preparation method thereof are characterized in that 265-277 parts by weight of cement, 184-200 parts by weight of composite admixture prepared by fully mixing 45-55 wt% of mineral powder, 25-30 wt% of steel slag, 15-20 wt% of desulfurized gypsum and 3-5 wt% of nanocrystalline nucleation type early strength agent, 780-800 parts by weight of tailing machine-made sand, 215-230 parts by weight of graded 5-15 tailing mechanism coarse aggregate, 863-875 parts by weight of graded 5-25 tailing mechanism coarse aggregate and 4.6-5.0 parts by weight of polycarboxylic acid water reducer are put into a mixer and are subjected to dry stirring, 134-140 parts by weight of water and additives are added twice, and finally constant temperature curing is carried out through a steam quick curing box, so that the prepared C80 solid waste concrete has excellent strength, a large amount of composite admixture is doped, the solid waste of steel slag, desulfurized gypsum and other smelting slag is fully utilized, the composite admixture prepared by a nano-meter gun machine replaces 40% of cement in the concrete, the composite admixture is cured under the condition of steam curing, the composite admixture is greatly combined with the precast admixture, the early strength of the precast concrete is improved, and the cost of the precast concrete is reduced, and the precast concrete member is promoted.
The present application is further illustrated by the following examples 1-3.
Example 1:
putting 77wt% of mineral powder, 0wt% of steel slag, 20wt% of desulfurized gypsum and 3wt% of nanocrystalline core type early strength agent into a mixing container, and fully mixing to obtain the composite admixture. According to the weight, when the C80 solid waste concrete per cubic meter is prepared, 276kg of cement, 184kg of prepared composite admixture, 781kg of tailing ore-made sand, 216kg of graded 5-15 tailing mechanism coarse aggregate, 863kg of graded 5-25 tailing mechanism coarse aggregate and 4.6kg of polycarboxylic acid water reducer are sequentially put into a stirring machine for dry stirring, then 134kg of water is added into the stirring machine twice, the stirring is continued for one minute after the admixture is added during the first addition of the water so as to uniformly wrap the surface slurry of the aggregate, and the stirring is continued for two minutes after the rest of the water and the admixture are added for the second addition of the water and the admixture, so that a semi-finished product of the C80 solid waste concrete is obtained.
Example 2:
putting 55wt% of mineral powder, 25wt% of steel slag, 15wt% of desulfurized gypsum and 5wt% of nano crystal nucleus type early strength agent into a mixing container, and fully mixing to obtain the composite admixture. According to the weight, when preparing C80 solid waste concrete per cubic meter, 276kg of cement, 184kg of prepared composite admixture, 781kg of tailing machine-made sand, 216kg of graded 5-15 tailing mechanism coarse aggregate, 863kg of graded 5-25 tailing mechanism coarse aggregate and 5.5kg of polycarboxylic acid water reducing agent are put into a stirrer in sequence and are subjected to dry stirring, 133kg of water is added into the stirrer twice, the admixture is added during the first time, the stirring is continued for one minute so as to uniformly wrap slurry on the surface of the aggregate, the rest water and the admixture are added during the second time, the stirring is continued for two minutes, and then the stirrer is taken out, so that a semi-finished product of the C80 solid waste concrete is obtained.
Example 3:
putting 45wt% of mineral powder, 30wt% of steel slag, 20wt% of desulfurized gypsum and 5wt% of nano crystal nucleus type early strength agent into a mixing container, and fully mixing to obtain the composite admixture. According to the weight, when preparing C80 solid waste concrete per cubic meter, 276kg of cement, 184kg of prepared composite admixture, 781kg of tailing machine-made sand, 216kg of graded 5-15 tailing mechanism coarse aggregate, 863kg of graded 5-25 tailing mechanism coarse aggregate and 5.5kg of polycarboxylic acid water reducing agent are put into a stirrer in sequence and are subjected to dry stirring, 133kg of water is added into the stirrer twice, the admixture is added during the first time, the stirring is continued for one minute so as to uniformly wrap slurry on the surface of the aggregate, the rest water and the admixture are added during the second time, the stirring is continued for two minutes, and then the stirrer is taken out, so that a semi-finished product of the C80 solid waste concrete is obtained.
And (3) carrying out 1d and 3d steam curing activity index tests on the composite admixture containing the steel slag in the embodiment 2 and the embodiment 3, wherein in the steam curing activity index test, the proportion of the composite admixture replacing cement in the semi-finished product of the C80 solid waste concrete is 50%, the steam curing system is that a mortar test piece is placed in a standard curing box for standing and curing for 12h after being formed, then the mortar test piece is placed in the steam curing box for 2h, the temperature is raised to 90 ℃ from the room temperature and then is kept for 4h, then the mortar test piece is cooled to the room temperature to obtain a finished product of the C80 solid waste concrete, and after the finished product is added with water for 1d and 3d, the strength of the finished product is tested, and the activity index is calculated. And the steam-curing activity indexes of the complex admixtures of examples 2 and 3 were compared with those of the S95 ore powder and the S105 ore powder, as shown in table 1:
TABLE 1
From the results, the activity index of the large-mixing-amount solid waste C80 solid waste concrete composite admixture under the steam curing condition is far higher than that of S95 mineral powder and is higher than that of S105 mineral powder. The desulfurization gypsum in the composite admixture system has a strong excitation effect on mineral powder and steel slag under a high-temperature condition, and the steam curing activity of the composite admixture is further improved by adding the nanocrystalline core type early strength agent.
Processing the semi-finished product of the C80 solid waste concrete prepared in the above examples 1-3 into a finished product, and performing a 1d and 3d steam curing strength test, wherein during the steam curing strength test, the proportion of the composite admixture replacing cement is 40%, the steam curing system is that the concrete is formed, then standing for 4h, then placing the concrete into a steam quick curing box, setting the temperature for 1h and 20min, raising the temperature to 80 ℃, curing for 6h at a constant temperature, then opening the cover and cooling to room temperature to obtain a C80 solid waste concrete finished product, taking the finished product out, and testing the steam curing strength after adding water for 1d and 3d, as shown in Table 2:
TABLE 2
| Name (R) | Example 1 | Example 2 | Example 3 |
| 1d steam curing strength/MPa | 66.5 | 81.2 | 80.7 |
| 3d steam curing strength/MPa | 81.3 | 95.0 | 96.1 |
| Slump/mm | 195 | 185 | 195 |
From the test results, compared with the example 1 in which steel slag is not doped in the composite admixture, 25wt% and 30wt% of steel slag is respectively doped in the C80 solid waste concrete in the examples 2 and 3, the 1d steam-cured strength of the C80 solid waste concrete is greater than 80MPa, the 3d steam-cured strength of the C80 solid waste concrete reaches more than 90MPa, and the strength advantage is better.
In summary, under the condition that the steel slag is added to the prepared C80 solid waste concrete to improve the solid waste proportion in the concrete, the composite admixture is excited through steam curing conditions, and the prepared large-doping-amount solid waste C80 solid waste concrete has high steam curing strength, so that the cost can be saved, the hot curing sparks of the concrete can be improved, the steel slag can be utilized, and the method has important economic benefits, social benefits and industrial values.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, the combinations should be considered as the scope of the present description.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, many variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (8)
1. The C80 solid waste concrete is characterized by comprising the following raw materials in parts by weight: 134 to 140 portions of water, 265 to 277 portions of cement, 184 to 200 portions of composite admixture, 780 to 800 portions of tailing machine-made sand, 215 to 230 portions of graded 5 to 15 tailing machine-made coarse aggregate, 863 to 875 portions of graded 5 to 25 tailing machine-made coarse aggregate and 4.6 to 5.0 portions of polycarboxylic acid water reducer;
wherein the composite admixture is prepared by proportionally compounding mineral powder, steel slag, desulfurized gypsum and nanocrystalline core type early strength agent.
2. The C80 solid waste concrete as claimed in claim 1, wherein the mineral powder accounts for 45-55 wt%, the steel slag accounts for 25-30 wt%, the desulfurized gypsum accounts for 15-20 wt%, and the nanocrystalline core type early strength agent accounts for 3-5 wt%.
3. The C80 solid waste concrete according to claim 1, wherein the compound admixture has a steam-curing activity index of more than 120% in 1d and a steam-curing activity index of more than 130% in 3 d.
4. The C80 solid waste concrete according to claim 1, wherein the solid waste mixing amount in the composite admixture is more than 60wt%, the total solid waste mixing amount in the C80 solid waste concrete is more than 70wt%, the 1d steam-cured strength of the C80 solid waste concrete is more than 80MPa, and the 3d steam-cured strength is more than 90MPa.
5. The C80 solid waste concrete according to claim 1, wherein the specific surface area of the steel slag is more than 400m 2 The activity index of 7d is 55-65%, and the activity index of 28d is 65-75%.
6. The C80 solid waste concrete according to claim 1, wherein the gypsum is industrial desulfurization byproduct gypsum, wherein calcium sulfate dihydrate is selected as a raw material for industrial desulfurization, and the content of the calcium sulfate dihydrate is more than 80% before industrial desulfurization.
7. A method for preparing C80 solid waste concrete, for preparing the C80 solid waste concrete according to any one of claims 1 to 6, comprising:
fully mixing 45-55 wt% of mineral powder, 25-30 wt% of steel slag, 15-20 wt% of desulfurized gypsum and 3-5 wt% of nanocrystalline core type early strength agent to obtain a composite admixture;
putting 265-277 parts by weight of cement, 184-200 parts by weight of the composite admixture, 780-800 parts by weight of tailing manufactured sand, 215-230 parts by weight of graded 5-15 tailing manufactured coarse aggregate, 863-875 parts by weight of graded 5-25 tailing manufactured coarse aggregate and 4.6-5.0 parts by weight of polycarboxylic acid water reducer into a mixing container in turn according to the feeding sequence, and performing dry stirring to obtain a first mixture;
adding 134-140 parts by weight of water and an additive into the first mixture twice, and stirring each time the water and the additive are added to obtain a second mixture;
standing the second mixture after the second mixture is formed, then placing the second mixture in a steam quick curing box, setting the temperature to be increased to 80 ℃ within a specified time, and carrying out constant-temperature curing to obtain a third mixture;
and cooling the third mixture to room temperature, taking out the third mixture, and removing the mold to obtain the C80 solid waste concrete.
8. The method for preparing C80 solid waste concrete according to claim 7, wherein the step of placing the second mixture after forming and standing in a steam fast curing box, raising the temperature to 80 ℃ for a specified time and curing at a constant temperature comprises the following steps:
standing for 4h, placing in the steam rapid curing box, setting the temperature for 1h and 20min, heating to 80 ℃, and curing at constant temperature for 6h.
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