CN113754374B - Low-clinker ultra-high performance concrete and preparation method thereof - Google Patents
Low-clinker ultra-high performance concrete and preparation method thereof Download PDFInfo
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- CN113754374B CN113754374B CN202111047121.8A CN202111047121A CN113754374B CN 113754374 B CN113754374 B CN 113754374B CN 202111047121 A CN202111047121 A CN 202111047121A CN 113754374 B CN113754374 B CN 113754374B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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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 invention discloses a low-clinker ultra-high performance concrete and a preparation method thereof. The raw materials comprise: the concrete comprises a cementing material, fine aggregate, water, a water reducing agent and fiber; the cementing material comprises molybdenum tailing powder, cement, converter steel slag powder, slag powder and desulfurized gypsum; the fiber accounts for 1% -5% of the total volume of the concrete; the raw materials except the fiber comprise the following components in parts by weight: 10-200 parts of molybdenum tailing powder, 50-150 parts of cement, 50-300 parts of converter steel slag powder, 200-500 parts of slag powder, 50-150 parts of desulfurized gypsum, 1000-1200 parts of fine aggregate, 150-180 parts of water and 5-15 parts of polycarboxylic acid water reducing agent; wherein the total weight part of the cementing material is 1000 parts. The invention can greatly reduce the cement consumption of the ultra-high performance concrete, simultaneously realize the resource utilization of molybdenum tailings and other solid wastes, reduce the production cost and reduce the environmental pollution caused by solid waste stacking.
Description
Technical Field
The invention relates to the technical field of resource environment and concrete preparation, in particular to low-clinker ultra-high performance concrete.
Background
Ultra-high Performance Concrete (UHPC for short) is a fiber reinforced cement-based composite material with Ultra-high durability and Ultra-high mechanical properties, wherein the compressive strength exceeds 150MPa. The preparation of the ultra-high performance concrete does not use coarse aggregate, but uses silica fume and fiber, and the cement consumption is large, and the water-cement ratio is very low.
With the development of mining industry, the comprehensive utilization of tailings becomes an important subject of waste resource utilization and environmental protection.
For example, the chinese application CN111072345A discloses an ecological ultra-high performance concrete and an application thereof, wherein lead-zinc tailings are used for preparing the ultra-high performance concrete instead of part of cement, the mass proportion of the lead-zinc tailings in the ultra-high performance concrete is less than 40%, wherein the cement amount accounts for more than 45% of the mass proportion of the cementing material of the ultra-high performance concrete, and the utilization rate of the lead-zinc tailings is low.
For another example, chinese application CN108558304A discloses a high-slip-resistance long-life ultra-high performance concrete pavement road, wherein the cement content in the cementitious material is 65%, milled copper tailing powder, silica fume and ultrafine mineral admixture are used as admixture, and copper tailing raw ore is used as partial fine aggregate to prepare the ultra-high performance concrete pavement material.
The method for preparing the ultra-high performance concrete in the prior art has the advantages that the cement consumption is high, the proportion of the cement in the cementing material is generally 45-70%, the high proportion of the cement consumption can cause the hydration temperature rise of the concrete to be large, and the risk of temperature stress cracking is generated; moreover, the comprehensive utilization rate of the tailings in the prior art is low.
Chinese application CN108751819A discloses a method for preparing high-performance concrete by using molybdenum tailings and waste stones, which is characterized in that the waste stones and the molybdenum tailings are obtained by mining molybdenum ores, the waste stones with the grain size of 4.5 mm-10 mm are used as concrete coarse aggregates, the molybdenum tailings with the grain size of 150 mu m-4.5 mm are used as concrete fine aggregates, and the molybdenum tailings with the grain size less than 150 mu m are ground to the specific surface area of 450-650 m 2 And mixing the coarse concrete aggregate, the fine concrete aggregate and the composite cementing material, and adding a water reducing agent and water to prepare the high-performance concrete. The concrete obtained by the method has 28d compressive strength up to 77.1MPa.
Although the method improves the utilization rate of the molybdenum tailings waste stone, the dosage of the cement clinker still reaches 31.7 percent, and the strength of the prepared concrete does not meet the strength requirement of the ultra-high performance concrete.
In summary, the main problems of the prior art are as follows: 1) The strength of the concrete prepared by molybdenum tailings in the prior art cannot meet the requirement of the ultra-high performance concrete; 2) The cement consumption for preparing the ultra-high performance concrete in the prior art is high, so that the hydration temperature rise of the concrete is high, and the risk of temperature stress cracking is generated; 3) The existing ultra-high performance concrete preparation technology has lower utilization rate of industrial solid wastes and higher production cost.
Disclosure of Invention
The invention aims to provide low-clinker ultra-high performance concrete and a preparation method thereof, which can greatly reduce the cement consumption of the ultra-high performance concrete, realize the resource utilization of molybdenum tailings and other solid wastes, reduce the production cost and reduce the environmental pollution caused by solid waste stacking.
The above purpose of the invention is realized by the following technical scheme:
according to one aspect of the invention, the invention provides a low clinker ultra-high performance concrete, which comprises the following raw materials: the concrete comprises a cementing material, fine aggregate, water, a water reducing agent and fiber; wherein the cementing material comprises molybdenum tailing powder, cement, converter steel slag powder, slag powder and desulfurized gypsum;
the fiber accounts for 1% -5% of the total volume of the concrete;
the raw materials except the fiber comprise the following components in parts by weight:
optionally, the molybdenum tailings powder is obtained by drying and grinding molybdenum tailings.
Optionally, the molybdenum tailings powder has a specific surface area of 700m 2 /kg～2000m 2 /kg。
Optionally, the molybdenum tailings mainly comprise the following chemical components in percentage by weight: siO 2 2 65％～80％，Al 2 O 3 8％～13％，Fe 2 O 3 0.1％～5％，K 2 O 3％～8％，Na 2 O 1％～5％，CaO 0.1％～4％。
Optionally, the cement is portland cement or ordinary portland cement having a strength grade of not less than 42.5.
Optionally, the converter steel slag powder has a specific surface area of 400m 2 /kg～500m 2 In terms of/kg. The alkalinity of the converter steel slag is more than or equal to 1.8.
Optionally, the slag powder has a specific surface area of 450m 2 /kg～600m 2 (iv) kg. The vitreous body content of the slag powder is more than or equal to 85 percent.
Optionally, theDesulfurized gypsum having a specific surface area of 400m 2 /kg～500m 2 And/kg, wherein the sulfur trioxide content in the desulfurized gypsum is more than 35 percent.
Alternatively, the fine aggregate may be medium sand.
Optionally, the fiber may be a reinforcing and toughening fiber such as a steel fiber or a polyoxymethylene fiber.
Alternatively, the water reducing agent may be a polycarboxylic acid-based water reducing agent.
Optionally, the 28d compressive strength of the low-clinker ultra-high performance concrete is 100MPa to 170MPa, and the flexural strength is 35MPa to 46MPa.
According to another aspect of the invention, the invention provides a preparation method of low-clinker ultra-high performance concrete, which comprises the following steps:
drying and grinding the molybdenum tailings to obtain molybdenum tailing powder;
grinding the converter steel slag powder, the slag powder and the desulfurized gypsum by adopting a single grinding and/or mixed grinding mode;
and mixing the low clinker ultra-high performance concrete according to the mixing proportion, and uniformly stirring by using a stirrer to obtain the low clinker ultra-high performance concrete.
Alternatively, when a mixed grinding mode is adopted, the mixed materials can be mixed and ground to the specific surface area of 500m 2 /kg～600m 2 /kg。
Compared with the prior art, the low-clinker ultra-high performance concrete and the preparation method thereof can greatly reduce the cement consumption of the ultra-high performance concrete, realize the resource utilization of molybdenum tailings and other solid wastes, reduce the production cost and reduce the environmental pollution caused by stacking of the solid wastes.
The advantages of the invention are mainly embodied in the following aspects:
(1) The invention utilizes the characteristics of finer molybdenum tailings particles, good grindability and high silicon dioxide content to grind the molybdenum tailings into powder fineness, for example, the molybdenum tailings are ground into the specific surface area of 700m 2 /kg～2000m 2 The fineness of/kg, thereby fully exerting the reaction activity of the superfine silicon dioxide and preparing the ultra-high performance concrete. Moreover, the invention utilizes the molybdenum tailings to prepare the super-high-grade molybdenumThe performance concrete realizes the resource utilization and high value-added utilization of the molybdenum tailings, and solves the problem of environmental pollution caused by the mass stockpiling of the molybdenum tailings.
(2) According to the invention, by selecting appropriate raw materials and optimizing the proportion, the cement consumption of the ultra-high performance concrete is greatly reduced, the proportion of the cement in the cementing material is reduced to 5-15% from 45-70% in the prior art, such as 10%, 15%, 5% and the like, the carbon emission is reduced, and the greenness of the ultra-high performance concrete is improved.
(3) The invention synergistically utilizes various industrial solid wastes such as molybdenum tailings, converter steel slag, desulfurized gypsum and the like to replace high-cost raw materials such as silica fume, cement and the like to prepare the ultra-high performance concrete, reduces the pollution of industrial solid waste stockpiling to the environment, greatly reduces the production cost, and has remarkable economic benefit and environmental benefit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides low-clinker ultra-high performance concrete which comprises the following raw materials: cementing materials, fine aggregates, water, polycarboxylic acid water reducing agents and fibers; wherein the cementing material comprises molybdenum tailing powder, cement, converter steel slag powder, slag powder and desulfurized gypsum; the fiber accounts for 1% -5% of the total volume of the concrete; the raw materials except the fiber comprise the following components in parts by weight: molybdenum tailings powder: 10-200 parts; cement: 50-150 parts; converter steel slag powder: 50-300 parts; slag powder: 200-500 parts; desulfurized gypsum: 50-150 parts; fine aggregate: 1000-1200 parts; water: 150-180 parts; polycarboxylic acid water reducing agent: 5-15 parts; wherein the total weight of the cementing material is 1000 parts. In the embodiment, the molybdenum tailing powder, the converter steel slag powder, the slag powder and the desulfurized gypsum are all industrial solid wastes, so that the recycling and high-added-value utilization of the molybdenum tailing and other solid wastes are realized, the production cost of the ultra-high-performance concrete is reduced, and the consumption of the cement is greatly reduced.
The molybdenum tailing powder is obtained by drying and grinding molybdenum tailings. The specific surface area of the molybdenum tailing powder is 700m 2 /kg～2000m 2 In terms of/kg. The molybdenum tailings comprise the following main chemical components in percentage by weight: siO 2 2 65％～80％，Al 2 O 3 8％～13％，Fe 2 O 3 0.1％～5％，K 2 O 3％～8％，Na 2 1 to 5 percent of O and 0.1 to 4 percent of CaO. SiO in the molybdenum tailing powder 2 The content is high, the fineness requirement is high, the embodiment can fully exert the reaction activity of the superfine silicon dioxide, and the ultrahigh-performance concrete can be prepared, for example, the 28d compressive strength can reach more than 160 MPa.
Optionally, the specific surface area of the converter steel slag powder is 400m 2 /kg～500m 2 (iv) kg. The alkalinity coefficient of the converter steel slag is more than or equal to 1.8. The specific surface area of the slag powder is 450m 2 /kg～600m 2 And/kg, wherein the vitreous body content of the slag powder is more than or equal to 85 percent. The specific surface area of the desulfurized gypsum is 400m 2 /kg～500m 2 Per kg, the sulfur trioxide content is more than 35 percent. The converter steel slag powder, the slag powder and the desulfurized gypsum can fully play the alkaline environment generated by the hydration of the steel slag and the chemical excitation effect of sulfate ions generated by the hydrolysis of the desulfurized gypsum on vitreous bodies in the slag powder, thereby forming a large amount of hydration products and becoming one of the sources of concrete strength.
The cement is Portland cement or ordinary Portland cement with the strength grade not lower than 42.5. The fine aggregate can be medium sand and the like, the fineness modulus of the medium sand is 3.0-2.3, and the average grain diameter is 0.5-0.35 mm. The fiber can be steel fiber or reinforced and toughened fiber such as polyformaldehyde fiber and the like.
According to the embodiment of the invention, the molybdenum tailings, the converter steel slag, the desulfurized gypsum and other industrial solid wastes are synergistically utilized to replace high-cost raw materials such as silica fume, cement and the like to prepare the ultra-high performance concrete, so that the pollution of industrial solid waste stockpiling to the environment is reduced, the resource utilization of the molybdenum tailings and the like is realized, the production cost of the concrete is reduced, the proportion of the cement in the cementing material is greatly reduced and can be reduced to 5-15%, and the economic benefit and the environmental benefit are obvious. The 28d compressive strength of the low-clinker ultrahigh-performance concrete prepared by the mixing proportion in the embodiment reaches over 160MPa, and the flexural strength reaches over 45 MPa.
The preparation method of the low-clinker ultra-high performance concrete provided by the embodiment of the invention comprises the following steps:
and S10, drying and grinding the molybdenum tailings to obtain molybdenum tailing powder. Wherein the molybdenum tailings mainly comprise the following chemical components in percentage by weight: siO 2 2 65％～80％，Al 2 O 3 8％～13％，Fe 2 O 3 0.1％～5％，K 2 O 3％～8％，Na 2 1 to 5 percent of O and 0.1 to 4 percent of CaO. Further, the preparation of the molybdenum tailings powder can specifically comprise the following steps: firstly, carrying out filter pressing or filter dehydration on the molybdenum tailings until the water content is not higher than 20%, and then drying by using a dryer; grinding the dried molybdenum tailings to a specific surface area of 700m 2 /kg～2000m 2 And/kg, obtaining the molybdenum tailing powder.
And S20, grinding the converter steel slag powder, the slag powder and the desulfurized gypsum by adopting a single grinding and/or mixed grinding mode. For example, the three parts may be separately ground; the desulfurized gypsum and the converter steel slag powder/slag powder can be mixed and ground firstly; or mixing and grinding the three components together; wherein, during the mixing and grinding, the powder is ground to the specific surface area of 500m 2 /kg～600m 2 /kg。
When the converter steel slag powder, the slag powder and the desulfurized gypsum are ground in a single grinding mode, the desulfurized gypsum can be dried and ground to the specific surface area of 400m 2 /kg～500m 2 Per kg, the content (mass fraction) of sulfur trioxide in the desulfurized gypsum is more than 35 percent; grinding the crushed and dried converter steel slag to 400m of specific surface area 2 /kg～500m 2 The alkalinity of the converter steel slag is more than or equal to 1.8; grinding granulated blast furnace slag to specific surfaceProduct 450m 2 /kg～600m 2 And/kg, wherein the vitreous body content (mass fraction) of the granulated blast furnace slag is more than or equal to 85%.
In the embodiment, the three materials are ground by adopting a single grinding mode, the respective fineness of the three materials can be controlled more accurately, required grinding equipment is increased correspondingly, and construction investment and energy consumption are increased.
When the converter steel slag and the desulfurized gypsum are mixed and ground firstly, the converter steel slag and the desulfurized gypsum can be mixed and ground according to the proportion until the specific surface area is 560m 2 /kg～600m 2 In terms of/kg. Preferably, the mass ratio of the converter steel slag to the desulfurized gypsum may be 3.
When the granulated blast furnace slag and the desulfurized gypsum are mixed and ground in advance, the desulfurized gypsum and the slag powder can be mixed and ground in proportion until the specific surface area is 530m 2 /kg～570m 2 In terms of/kg. Preferably, the mass ratio of the desulfurized gypsum to the slag powder can be 1.
The two mixed grinding modes, namely the mode of mixing and grinding the desulfurized gypsum and the converter steel slag/granulated blast furnace slag, can reduce the input of grinding equipment, improve the output per hour of grinding machine and reduce the energy consumption of unit products, but the respective fineness control accuracy of the materials during the mixed grinding is slightly reduced due to the difference of the grindability of the materials. Moreover, in the two preferred embodiments, the mixing amount of the easy-to-grind material desulfurized gypsum is controlled, so that the phenomenon of false specific surface area caused by the difference of the easy-to-grind properties between the materials can be reduced, namely, the easy-to-grind material is ground to be very thin, while the difficult-to-grind material is thick, but the specific surface area meets the requirement; the influence of the false specific surface area on the fineness of the mixed material can be overcome as much as possible, so that the steel slag or slag particles with poor grindability can be prevented from being ground to the required fineness.
When the three are mixed and ground together, the slag powder, the converter steel slag and the desulfurized gypsum can be mixed and ground to 500m according to the proportion 2 /kg～600m 2 In terms of/kg. For example, it may be milled to 520m 2 /kg、540m 2 /kg、560m 2 /kg、580m 2 /kg、600m 2 Kg, etc.
The embodiment adopts a mode of mixing and grinding the three materials together, can reduce the input and the energy consumption of the grinding equipment, but the accuracy of controlling the respective fineness of the materials during mixing and grinding is reduced due to the difference of the grindability of the materials.
Preferably, when the three materials are mixed and ground, the mixing amount proportion of the desulfurized gypsum in the mixed and ground material is controlled to be less than 25 percent, for example, the proportion of the desulfurized gypsum in the mixed and ground material can be 5 percent, 10 percent, 15 percent, 20 percent, 24 percent and the like, so as to reduce the phenomenon of false specific surface area caused by the difference of grindability between the materials, namely the desulfurized gypsum is ground to be very fine, and the slag powder and the converter steel slag are thicker, but the specific surface area meets the requirement; the influence of the false specific surface area on the fineness of the mixed material is overcome as much as possible, and the problem that the material with poor grindability is not ground to the required fineness is prevented.
And S30, uniformly stirring and mixing the mixture by adopting a forced mixer according to the mixing proportion to obtain a low-clinker ultra-high performance concrete mixture, and performing standard curing for 28 days after molding, wherein the compressive strength is 100MPa to 170MPa, and the flexural strength is 35MPa to 46MPa.
The technical solution of the present invention is further described below with reference to specific embodiments:
example 1
The formulation of the low-clinker ultra-high performance concrete in this example is shown in table 2.
The molybdenum tailings are obtained from the molybdenum tailings in the sand terrace ditch, and the chemical components are shown in the following table 1.
TABLE 1 sandplateau ditch molybdenum tailings sample chemistry
The preparation method of the low-clinker ultra-high performance concrete in the embodiment is as follows:
1) Feeding the molybdenum tailings into a high-pressure filter press for filter pressing, wherein the water content of a filter cake is 15% -20%, crushing the filter cake by a crusher, and then feeding the crushed filter cake into a dryer for drying;
2) The dried molybdenum tailings are ground to 1500m of specific surface area by a superfine mill 2 /kg～2000m 2 The result of the test is carried out on the kg by adopting a laser particle size analyzer;
3) Outsourcing S105 level granulated blast furnace slag powder with the specific surface area of 510m 2 /kg；
4) The method comprises the following steps of (1) purchasing desulfurization gypsum of a thermal power plant outside, testing the sulfur trioxide content (mass percent) in the desulfurization gypsum to be 40.2%, and drying the desulfurization gypsum by a dryer;
5) The alkalinity of the converter steel slag purchased from outsourcing is 2.1, the converter steel slag crushed and dried and the desulfurized gypsum dried are sent into a ball mill according to the mass ratio of 3 2 Per kg, obtaining mixed powder A;
6) The ultra-high performance concrete is produced according to the mixing proportion in the table 2, test pieces of compressive strength and flexural strength are molded and maintained according to the national standard GB/T50081-2019 of concrete physical and mechanical property test method standard, the age strength of the test pieces is tested for 3 days, 7 days and 28 days, and the test results are shown in the table 2.
Comparative example 1
The formulation of the concrete in this comparative example is shown in table 2.
The raw materials of the concrete in this comparative example were in accordance with the relevant national standards, and ultra-high performance concrete was produced in the same manner as in the examples of the present invention.
Curing and performance testing, the results are shown in table 2, and the test standards are the same as in example 1.
TABLE 2 ultra-high performance concrete mix ratio and compressive and flexural strengths
Example 2
The formulation of the low-clinker ultra-high performance concrete in this example is shown in table 4.
The molybdenum tailings in Chengde are used as raw materials, and the chemical components are shown in the following table 3.
TABLE 3 chemical composition of molybdenum tailings sample from Chengde
The preparation method of the low-clinker ultra-high performance concrete in the embodiment is as follows:
1) Feeding molybdenum tailings in a tailing field into a high-pressure filter press for filter pressing, wherein the water content of a filter cake is 13% -16%, crushing the filter cake by a crusher, and then feeding the crushed filter cake into a dryer for drying;
2) Grinding the dried molybdenum tailings to a specific surface area of 800m by using a ball mill 2 /kg～950m 2 Kg, testing results by adopting a laser particle size analyzer;
3) Testing 38.5% of sulfur trioxide in the desulfurization gypsum by mass percent, and drying the desulfurization gypsum by using a dryer;
4) Outsourcing S95 level granulated blast furnace slag powder with specific surface area of 425m 2 /kg；
5) Feeding the dried desulfurized gypsum and the granulated blast furnace slag powder into a ball mill according to the mass ratio of 1 2 Per kg, obtaining mixed powder B;
6) Purchased steel slag powder with the specific surface area of 400m 2 /kg；
7) The ultra-high performance concrete is produced according to the mixing proportion in the table 4, test pieces of compressive strength and flexural strength are molded and maintained according to the national standard GB/T50081-2019 of concrete physical mechanical property test method standard, and the age strength of the test pieces in 3 days, 7 days and 28 days is shown in the table 4.
Comparative example 2
The formulation of the concrete in this comparative example is shown in Table 4.
The raw materials of the concrete in this comparative example were in accordance with the relevant national standards, and ultra high performance concrete was produced in the same manner as in the example of the present invention.
Curing and performance testing, the results are shown in table 4, and the test standards are the same as example 2.
TABLE 4 concrete mix ratio and compression and rupture strengths of example 2 and comparative example 2
Example 3
The formulation of the low clinker ultra high performance concrete in this example is shown in table 6.
The molybdenum tailings in the east China ditch are used as raw materials, and the chemical components are shown in the following table 5.
TABLE 5 Toho molybdenum tailings sample chemical composition
The preparation method of the low clinker ultra-high performance concrete in the embodiment is as follows:
1) Drying the molybdenum tailings, and grinding the molybdenum tailings to the specific surface area of 1000m by using a ball mill 2 /kg～1200m 2 Kg, testing results by adopting a laser particle size analyzer;
2) The desulfurization gypsum of outsourcing thermal power plant is tested to have the sulfur trioxide content of 37.8 percent and the water content of 16.4 percent;
3) Outsourcing granulated blast furnace slag, wherein the vitreous body content is 90 percent, and the water content is 15 percent; the converter steel slag purchased externally has the alkalinity of 2.2 and the water content of 5 percent;
4) Granulating blast furnace slag, converter steel slag and desulfurized gypsum according to a dry basis mass ratio of 5:3:1.5 preparing materials, grinding in a vertical mill until the specific surface area is 520 +/-20 m 2 Per kg, obtaining mixed powder C;
5) The ultra-high performance concrete is produced according to the mixing proportion in the table 6, test pieces of compressive strength and flexural strength are formed and maintained according to the national standard GB/T50081-2019 of concrete physical mechanical property test method standard, and the age strength of the test pieces in 3 days, 7 days and 28 days is shown in the table 6.
Comparative example 3
The blending ratio of the concrete in this comparative example is shown in Table 6.
The raw materials of the concrete in this comparative example were in accordance with the relevant national standards, and ultra high performance concrete was produced in the same manner as in the example of the present invention.
Curing and performance testing, the results are shown in table 6, and the test standards are the same as in example 3.
TABLE 6 concrete mix ratio and compression and rupture strengths of example 3 and comparative example 3
The above examples and comparative examples of the invention show that: the invention utilizes a plurality of industrial solid wastes such as molybdenum tailings, converter steel slag, desulfurized gypsum, slag powder and the like to replace high-cost raw materials such as silica fume, cement and the like to prepare the ultra-high performance concrete, reduces the environmental pollution caused by industrial solid waste stockpiling under the requirements of the mixing proportion and fineness of the invention, greatly reduces the cement consumption of the ultra-high performance concrete, reduces the carbon emission from 45-70% in the prior art to 5-15%, reduces the production cost, and has remarkable economic benefit and environmental benefit, and the 28d compressive strength of the ultra-high performance concrete prepared by the invention can reach more than 160 MPa.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (6)
1. The low-clinker ultra-high performance concrete is characterized by comprising the following raw materials: cementing materials, fine aggregates, water, a water reducing agent and fibers; the cementing material comprises molybdenum tailing powder, cement, converter steel slag powder, slag powder and desulfurization gypsum;
the fiber accounts for 1% -5% of the total volume of the concrete;
the raw materials except the fiber comprise the following components in parts by weight:
wherein the molybdenum tailing powder is obtained by drying and grinding molybdenum tailings, and the specific surface area of the molybdenum tailing powder is 700m 2 /kg～2000m 2 /kg；
The alkalinity of the converter steel slag powder is more than or equal to 1.8, the vitreous body content of the slag powder is more than or equal to 85%, and the sulfur trioxide content in the desulfurized gypsum is more than 35%;
and when the low-clinker ultra-high performance concrete is prepared, the mixing amount of the desulfurized gypsum is controlled, and the converter steel slag powder, the slag powder and the desulfurized gypsum are ground into the specific surface area of 500m by adopting a mixed grinding mode of mixing and grinding the converter steel slag powder, the slag powder and the desulfurized gypsum or a mixed grinding mode of mixing and grinding the converter steel slag powder, the slag powder and the desulfurized gypsum 2 /kg～600m 2 /kg of forming a mixed powder;
wherein, when the converter steel slag and the desulfurized gypsum are mixed and ground, the mixture is ground until the specific surface area is 560m 2 /kg～600m 2 The mass ratio of the converter steel slag to the desulfurized gypsum is controlled to be 3 to 1; when the desulfurized gypsum and the slag powder are mixed and ground, the mixture is ground until the specific surface area is 530m 2 /kg～570m 2 The mass ratio of the desulfurized gypsum to the slag powder is controlled to be 1;
when the slag powder, the converter steel slag and the desulfurized gypsum are mixed and ground, the mixture is ground to 500m 2 /kg～600m 2 And/kg, and controlling the mixing amount proportion of the desulfurized gypsum in the mixed grinding material to be less than 25 percent.
2. The low clinker ultra-high performance concrete of claim 1, wherein the molybdenum tailings comprise the following main chemical components in percentage by weight: siO 2 2 65％～80％，Al 2 O 3 8％～13％，Fe 2 O 3 0.1％～5％，K 2 O 3％～8％，Na 2 O 1％～5％，CaO 0.1％～4％。
3. The low clinker ultra high performance concrete of claim 1, wherein the cement is portland cement or ordinary portland cement having a strength grade of not less than 42.5.
4. The low clinker ultra-high performance concrete of claim 1, wherein the fine aggregate is medium sand; the fiber is steel fiber or polyformaldehyde fiber; the water reducing agent is a polycarboxylic acid water reducing agent.
5. The low clinker ultra-high performance concrete of claim 1, wherein the 28d compressive strength of the low clinker ultra-high performance concrete is 100MPa to 170MPa, and the flexural strength is 35MPa to 46MPa.
6. The preparation method of the low-clinker ultra-high performance concrete is characterized by comprising the following steps:
drying and grinding the molybdenum tailings to the specific surface area of 700m 2 /kg～2000m 2 Obtaining molybdenum tailing powder;
the converter steel slag powder, the slag powder and the desulfurized gypsum are ground into the specific surface area of 500m by adopting a mixed grinding mode of the two or the three 2 /kg～600m 2 Forming mixed powder per kg, and controlling the mixing amount of the desulfurized gypsum; wherein, when the converter steel slag and the desulfurized gypsum are mixed and ground, the mixture is ground until the specific surface area is 560m 2 /kg～600m 2 The mass ratio of the converter steel slag to the desulfurized gypsum is controlled to be 3 to 1; when the desulfurized gypsum and the slag powder are mixed and ground, the mixture is ground until the specific surface area is 530m 2 /kg～570m 2 The mass ratio of the desulfurized gypsum to the slag powder is controlled to be 1; when the slag powder, the converter steel slag and the desulfurized gypsum are mixed and ground, the mixture is ground to 500m 2 /kg～600m 2 The mixing amount of the desulfurized gypsum in the mixed grinding material is controlled to be less than 25 percent; the alkalinity of the converter steel slag powder is more than or equal to 1.8, the vitreous body content of the slag powder is more than or equal to 85%, and the sulfur trioxide content in the desulfurized gypsum is more than 35%;
the low clinker ultra-high performance concrete of claim 1 is mixed according to the mixing proportion and is uniformly stirred by a stirrer to obtain the low clinker ultra-high performance concrete.
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