CN112299804B - Industrial solid waste concrete for prefabricated part and preparation method and application thereof - Google Patents
Industrial solid waste concrete for prefabricated part and preparation method and application thereof Download PDFInfo
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
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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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- 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
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention relates to industrial solid waste concrete for a prefabricated part and a preparation method and application thereof, wherein the industrial solid waste concrete for the prefabricated part comprises the following raw materials in parts by weight: 220-280 parts of cement, 90-200 parts of composite admixture, 740-790 parts of fine aggregate, 1070-1130 parts of coarse aggregate, 7.5-8 parts of additive and 140-160 parts of water; wherein the composite admixture comprises 16-35 wt.%: 5-10: 2-4: 0.5-1 of fly ash, steel slag, regenerated powder and desulfurized gypsum. The industrial solid waste concrete for the prefabricated part provided by the invention adopts large-mixing-amount multi-element multi-scale industrial solid waste to develop and prepare economic, environment-friendly and industrially produced solid waste concrete for the prefabricated part on the premise of meeting the requirement of the use performance of the prefabricated part concrete.
Description
Technical Field
The invention relates to the technical field of preparation of concrete prefabricated parts, in particular to solid waste concrete for prefabricated parts and a preparation method and application thereof.
Background
The concrete prefabricated part is processed and produced in a standardized mode in a factory to prepare various products, and the products are transported to the site for hoisting and splicing, so that the rapid and low-pollution building of a building can be realized. Therefore, the assembly type building mode based on the precast concrete member reflects the industrialized development trend and the advanced level of the modern building and also becomes an important way for realizing green sustainable development of the modern building.
In the production and preparation of the assembled PC (precast concrete) member, the realization of resource utilization of metallurgical waste residues, mine tailings/waste rocks and urban construction waste is a way to further improve the energy-saving level of buildings. The PC has high requirements on the quality of raw materials, and although the 28-day activity index of the composite concrete admixture mainly made of steel slag and fly ash can reach 85 percent and is applied to the production of part of prefabricated parts in Japan and Europe, the mineral admixture mainly made of fly ash and slag in the concrete for preparing the prefabricated parts at present has lower proportion of the mineral admixture in the total gelled materials. CN 109437718A provides C40 grade solid waste concrete, the mixing amount of the composite admixture is 50%, reinforced recycled coarse aggregate is used to completely replace coarse aggregate, however, the used recycled reinforced coarse aggregate is recycled coarse aggregate reinforced by potassium water glass, so the economic efficiency is not strong. CN 111362631A provides a preparation method for coagulating a full-solid waste cementing material, but the preparation method needs alkali activators such as water glass and steam curing, so that the preparation cost is increased, and the industrial production is not facilitated.
Disclosure of Invention
The embodiment of the invention provides industrial solid waste concrete for a prefabricated part. The industrial solid waste concrete for the prefabricated part provided by the invention adopts large-mixing-amount multi-element multi-scale industrial solid waste to develop and prepare economic, environment-friendly and industrially-producible solid waste concrete for the prefabricated part on the premise of meeting the requirement of the use performance of the prefabricated part concrete.
The embodiment of the invention provides industrial solid waste concrete for a prefabricated part, which comprises the following raw materials in parts by weight: 200-300 parts of cement, 80-300 parts of composite admixture, 700-800 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 5-10 parts of additive and 100-200 parts of water; wherein the composite admixture comprises 16-35 wt.%: 5-10: 2-4: 0.5-1 of fly ash, steel slag, regenerated powder and desulfurized gypsum.
In some preferred embodiments, in the composite blend, the fly ash is class ii fly ash; and/or the steel slag powder is first-grade steel slag powder; and/or the regenerated powder is regenerated micro powder and/or stone powder; and/or the desulfurized gypsum is dihydrate gypsum.
In some preferred embodiments, the composite admixture has a 45mm square hole sieve residue of the fly ash of less than or equal to 30 percent, a water requirement ratio of less than or equal to 105 percent, a sulfur trioxide content of less than or equal to 3 percent, and a 28-day strength activity index of greater than or equal to 75 percent; and/or the specific surface area of the steel slag powder is more than 400m2Kg, 28-day strength activity index is less than or equal to 85 percent; and/or the regenerated micro powder is grade I regenerated micro powder, the screen residue of a 45mm square-hole sieve is less than or equal to 30%, the water demand ratio is less than or equal to 105%, the 28-day strength activity index is more than or equal to 70%, and the MB value is less than 1.4; and/or the stone powder is waste iron tailing stone powder, the screen residue of a 45mm square-hole screen is less than or equal to 30%, the fluidity ratio is more than or equal to 95%, and the 28-day compressive strength ratio is more than or equal to 65%; and/or the dihydrate gypsum is prepared by drying desulfurized gypsum with the purity of more than 85 percent and the water content of less than 15 percent at the temperature of 30-70 ℃.
The invention improves the proportion of the admixture in the cementing material by optimizing the composition and the proportion of the admixture, thereby reducing the dosage of cement in the cementing material. Particularly, the concrete is further compacted by adopting low-value filling materials such as regenerated micro powder, tailing waste stone powder and the like, and the compactness of the concrete is ensured while the cementing materials are reduced.
In some preferred embodiments, the fine aggregate consists of natural river sand, tailings fine aggregate, and recycled fine aggregate; the sum of the weight parts of the tailing fine aggregate and the recycled fine aggregate is more than or equal to 60 parts, and the weight parts of the tailing fine aggregate are more than or equal to 30 parts, based on 100 parts of the fine aggregate.
In some preferred embodiments, the coarse aggregate consists of natural crushed stone, tailings waste stone, and recycled coarse aggregate; the total weight of the tailing waste rock and the recycled coarse aggregate is more than or equal to 80 parts, and the part of the tailing waste rock is more than or equal to 50 parts, based on 100 parts of the total mass of the coarse aggregate.
In some preferred embodiments, the fine aggregate: the fineness modulus of the natural river sand is 2.7-3.1, and the mud content of the type II sand is less than 1.0%; and/or the tailing fine aggregate is machine-made sand obtained by crushing and screening iron tailing waste rocks, the fineness modulus is 2.5-3.0, and the content of stone powder is less than or equal to 5%; and/or the recycled fine aggregate is II-type recycled fine aggregate with the micro powder content of less than 7% and the MB value of less than 1.4, and the fineness modulus is 2.5-3.0; and/or
In some preferred embodiments, the coarse aggregate: in the natural macadam, the content of micro powder is less than or equal to 2 percent, the water absorption rate is less than or equal to 2 percent, and the crushing index is less than or equal to 20 percent; and/or the content of micro powder in the waste tailings is less than or equal to 2 percent, the water absorption rate is less than or equal to 2 percent, and the crushing index is less than or equal to 20 percent; and/or the recycled coarse aggregate has the micro powder content of less than or equal to 2 percent, the water absorption of less than or equal to 5 percent and the crushing index of less than or equal to 14 percent.
According to the present invention, it has been found that the above-mentioned coarse aggregate and fine aggregate can effectively improve the economical efficiency of the concrete while maintaining the performance of the concrete, and further, the concrete can be densified by using the above-mentioned admixture, thereby maintaining the durability of the concrete.
In some preferred embodiments, the admixture is a polycarboxylic acid water reducing agent; and/or the cement used is 42.5 Portland cement.
In some preferred embodiments, 220-280 parts of cement, 90-200 parts of composite admixture, 740-790 parts of fine aggregate, 1070-1130 parts of coarse aggregate, 7.5-8 parts of additive and 140-160 parts of water; preferably, 228-240 parts of cement, 160-200 parts of composite admixture, 740-780 parts of fine aggregate, 1070-1130 parts of coarse aggregate, 7.6-8 parts of admixture and 144-152 parts of water.
The inventor finds that the solid-waste composite admixture, the multi-component multi-scale mixed aggregate and the like in the proportion are matched with each other to develop the large-mixing-amount industrial solid-waste concrete for the prefabricated part based on performance design, and particularly, the invention adopts the multi-component multi-scale industrial solid waste, the recycled building solid waste and the like, so that the problems of insufficient supply of the sandstone aggregate and environmental pressure caused by the large amount of stockpiled solid waste can be solved, and meanwhile, the solid-waste mixing amount in the solid-waste concrete can be improved, the compactness of the solid-waste concrete can be improved by adopting full-aggregate grain-grade optimization and multi-component admixture compatibility, so that the durability of the solid-waste concrete is ensured, and the economical efficiency and the environmental protection performance of the concrete are further improved on the premise of keeping the quality of the concrete.
The embodiment of the present invention further provides a preparation method of the industrial solid waste concrete for prefabricated parts, wherein the cement, the composite admixture, the fine aggregate, the coarse aggregate, the admixture and the water are mixed according to a ratio, and preferably, the preparation method comprises:
1) mixing the steel slag powder, the fly ash, the regenerated powder and the desulfurized gypsum according to the proportion to obtain the composite admixture;
2) mixing the tailing fine aggregate, the recycled fine aggregate, the natural river sand, the composite admixture and the cement, stirring for the first time, adding the recycled coarse aggregate, the tailing waste stone and the natural broken stone, and stirring for the second time to obtain a dry material;
3) adding a proper amount of water and an additive into the dry materials, and stirring for the first time; and adding the rest water and the additive, stirring for the second time, and discharging to obtain the water-based paint.
In some preferred embodiments, in step 2), feeding is performed in the order of tailing fine aggregate, recycled fine aggregate, natural river sand, the composite admixture, and cement; and/or the primary stirring time is 20-40 s; and/or the secondary stirring time is 20-40 s; and/or
In the step 3), the amount of the first water addition is 50-70%; and/or the amount of the additive added for the first time is 50-70%; and/or the primary stirring time is 0.5-1.5 min; and/or the secondary stirring time is 1-3 min.
The embodiment of the invention also provides application of the industrial solid waste concrete for the prefabricated part or the industrial solid waste concrete for the prefabricated part obtained by the preparation method in preparation of prefabricated parts such as large-mixing-amount solid waste concrete prefabricated stairs, large-mixing-amount solid waste concrete prefabricated laminated slabs and the like.
The invention has the beneficial effects that: compared with the prior art, the total solid waste mixing percentage of the large-mixing-amount solid waste concrete for the prefabricated part can reach 70 percent, which is beneficial to relieving the current situation of shortage of the supply of the natural sandstone aggregate, and simultaneously, the solid waste produced in the coal-electricity, metallurgy and mineral industry can be largely consumed, and the environmental pressure can be relieved. And the high-doping-amount solid waste concrete has excellent performance, the prepared prefabricated part completely meets the structural design requirement, and the production cost of the prefabricated part is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of an arrangement of a prefabricated staircase detection loading dial indicator according to an embodiment of the present invention;
FIG. 2 is a deflection curve diagram of the load (including the dead weight) of the prefabricated composite slab provided by the embodiment of the invention;
FIG. 3 is a schematic diagram illustrating an arrangement of a loading dial indicator for detecting a prefabricated composite slab according to an embodiment of the present invention;
fig. 4 is a graph of the load (including dead weight) deflection of the prefabricated staircase provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications.
In the present invention, the instruments and the like used are conventional products which are purchased from regular vendors, not indicated by manufacturers. The process is conventional unless otherwise specified, and the starting materials are commercially available from the open literature. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications.
In the following examples of the invention, the fly ash is class II fly ash in GB/T1596-2017 which conforms to fly ash for cement and concrete, the screen residue of a square hole with the diameter of 45mm is less than or equal to 30 percent, the water demand ratio is less than or equal to 105 percent, the content of sulfur trioxide is less than or equal to 3 percent, and the strength activity index in 28 days is not less than 75 percent; the specific surface area of the steel slag powder is more than 400m2The strength and activity index of the concrete is not lower than 85% after 28 days, and the requirement of GB/T20491 first-grade steel slag powder in Steel slag powder for cement and concrete is met; the regenerated micro powder is grade I regenerated micro powder with the screen residue of a 45mm square-hole screen being less than or equal to 30%, the water demand ratio being less than or equal to 105%, the 28-day strength activity index being more than or equal to 70% and the MB value being less than 1.4; the stone powder is iron tailing waste stone powder with the screen residue of a square-hole screen of 45mm being less than or equal to 30 percent, the fluidity ratio being more than or equal to 95 percent, and the 28-day compressive strength ratio being more than or equal to 65 percent; the desulfurized gypsum is prepared by drying desulfurized gypsum with the purity of more than 85 percent and the water content of less than 15 percent at 50 ℃ to constant weight.
In the following embodiment of the invention, in the composite admixture, the fly ash accounts for 70% of the total admixture mass, the steel slag accounts for 20%, the regenerated micro powder and the stone powder account for 8% of the total admixture mass (the regenerated micro powder: the stone powder is 1:1), and the desulfurized gypsum accounts for 2% of the total admixture mass. In the fine aggregate, the total amount of the tailing fine aggregate and the recycled fine aggregate replacing natural river sand accounts for 70 percent of the total fine aggregate mass fraction, wherein the recycled fine aggregate accounts for 30 percent. In the coarse aggregate, the total amount of the tailing waste stones and the recycled coarse aggregate accounts for 80% of the mass fraction of the total coarse aggregate, wherein the recycled coarse aggregate accounts for 20%. The additive is a polycarboxylic acid water reducing agent; the used cement is P.O 42.5.5 ordinary portland cement; the water used was tap water.
Example 1
The concrete proportioning design (cement, composite admixture, fine aggregate, coarse aggregate, admixture and water) of the multi-component multi-scale industrial solid waste concrete for the large-doping-amount prefabricated part provided by the embodiment is shown in table 1. And then preparing the weighed components into the fresh concrete according to the charging sequence and the preparation method.
The embodiment of the invention provides a preparation method of multi-element multi-scale industrial solid waste concrete for a large-volume Prefabricated (PC) member, which comprises the following steps:
step 1), weighing steel slag powder, fly ash, regenerated micro powder/stone powder and desulfurized gypsum according to the composition of the composite admixture, and adding the steel slag powder, the fly ash, the regenerated micro powder/stone powder and the desulfurized gypsum into a mixing container for fully mixing to prepare the composite admixture;
step 2), weighing fine aggregate and coarse aggregate according to the proportion of the solid waste concrete, feeding the tailing fine aggregate, the recycled fine aggregate, the natural river sand, the composite admixture obtained in the step 1) and cement in sequence, stirring for 30s, then adding the recycled coarse aggregate, the tailing waste stone and the natural broken stone, and stirring for 30s to uniformly mix the obtained dry materials;
step 3), adding 50-70% of partial water and 50-70% of an additive into the dry material mixed in the step 2), and stirring for 1min to uniformly wrap the slurry on the surface of the aggregate; then adding the rest water and the additive, stirring for 2min, and discharging.
Examples 2 to 12
Fresh concrete was prepared using the same materials and methods as in example 1, except that the following concrete mix ratios were varied (see table 1).
TABLE 1 concrete mix proportions in examples 1-12
Experimental example 1
Slump, mechanical properties of hardened concrete, chloride ion permeation resistance and frost resistance of fresh concrete were tested according to the test methods in Standard test methods for Performance of ordinary concrete mixtures GB/T50080, Standard test methods for mechanical Properties of ordinary concrete GB/T50081 and test methods for Long-term Performance and durability of ordinary concrete GB/T50082, and the test results of the properties of the concretes in examples 1 to 12 are shown in Table 2.
Table 2 examples 1-12 performance parameters
According to the test results of the embodiments 1-12, the solid waste content in the concrete is more than or equal to 65%, the 28-day compressive strength is more than 40MPa, the 28-day electric flux is 546-934C, the index requirements of the concrete with the assembled structure are met, and the mechanical property and durability indexes are excellent. Meanwhile, because a large amount of solid wastes in cities and industries are doped, the cost of the concrete is greatly reduced, the product is more economic and environment-friendly, the technical obstacle is overcome, and the concrete has good social and economic values.
Experimental example 2 prefabricated staircase with large mixing amount of solid waste concrete
Taking the concrete prepared in the example 1 as an example, the prepared prefabricated staircase has flexibility, cracks and bearing capacity tested according to GB/T50204 and 2015 acceptance for construction quality of concrete structural engineering, and the test result is shown in FIG. 1. The proportion of the composite admixture in the embodiment 1 is higher, and various performances such as workability and durability of the prepared concrete also meet the use requirements.
The large-mixing-amount solid waste concrete prefabricated staircase has no crack at the bottom of the staircase plate in the whole loading process, has no bearing capacity limit state mark, has a bearing capacity test coefficient of 1.2, and at least meets the design requirements of a common prefabricated staircase.
Experimental example 3 solid waste concrete precast composite slab with large mixing amount
Taking the concrete prepared in example 1 as an example, the prepared prefabricated composite slab is tested for deflection, cracks and bearing capacity according to GB/T50204 and 2015 acceptance for construction quality of concrete structural engineering, and the test result is shown in FIG. 2.
The large-mixing-amount solid waste concrete prefabricated staircase has the advantages that no crack is seen at the bottom of the staircase before the total external load reaches the load standard combination value, the deflection is obviously smaller than the limit value design requirement, the bearing capacity test coefficient is 1.22, and the design requirement of a common laminated slab is at least met.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The industrial solid waste concrete for the prefabricated part is characterized by comprising the following raw materials in parts by weight: 200-280 parts of cement, 90-300 parts of composite admixture, 740-790 parts of fine aggregate, 1070-1130 parts of coarse aggregate, 7.5-8 parts of additive and 100-200 parts of water; wherein the composite admixture comprises 16-35 wt.%: 5-10: 2-4: 0.5-1 of fly ash, steel slag powder, regeneration powder and desulfurized gypsum;
the fine aggregate consists of natural river sand, tailing fine aggregate and recycled fine aggregate; the sum of the weight parts of the tailing fine aggregate and the recycled fine aggregate is more than or equal to 60 parts, and the weight parts of the tailing fine aggregate is more than or equal to 30 parts, based on 100 parts of the fine aggregate; the coarse aggregate consists of natural broken stones, tailing waste stones and recycled coarse aggregate; the total weight of the tailing waste rock and the recycled coarse aggregate is more than or equal to 80 parts, and the part of the tailing waste rock is more than or equal to 50 parts, based on 100 parts of the total mass of the coarse aggregate; in the composite admixture, the fly ash is grade II fly ash; the steel slag powder is first-grade steel slag powder; the regenerated powder is regenerated micro powder and/or stone powder; the desulfurized gypsum is dihydrate gypsum; in the composite admixture, the fly ash with 45mm square holes has the screen residue less than or equal to 30 percent, the water demand ratio is less than or equal to 105 percent, the sulfur trioxide content is less than or equal to 3 percent, and the 28-day strength activity index is more than or equal to 75 percent; the specific surface area of the steel slag powder is more than 400m2Kg, 28-day strength activity index is less than or equal to 85 percent; the regenerated micro powder is grade I regenerated micro powder, the screen residue of a 45mm square-hole screen is less than or equal to 30 percent, the water demand ratio is less than or equal to 105 percent, the 28-day strength activity index is more than or equal to 70 percent, and the MB value is less than 1.4; the stone powder is waste iron tailing powder, the screen residue of a 45mm square-hole screen is less than or equal to 30 percent, the fluidity ratio is more than or equal to 95 percent, and the 28-day compressive strength ratio is more than or equal to 65 percent; the dihydrate gypsum is prepared by drying desulfurized gypsum with the purity of more than 85 percent and the water content of less than 15 percent at the temperature of 30-70 ℃.
2. The industrial solid waste concrete for prefabricated parts according to claim 1, wherein the fine aggregate: the fineness modulus of the natural river sand is 2.7-3.1, and the mud content is less than 1.0 percent of the type II sand; the tailing fine aggregate is machine-made sand obtained by crushing and screening iron tailing waste rocks, the fineness modulus is 2.5-3.0, and the content of stone powder is less than or equal to 5%; the recycled fine aggregate is II-type recycled fine aggregate with the micro powder content of less than 7 percent and the MB value of less than 1.4, and the fineness modulus is 2.5-3.0; the coarse aggregate: in the natural macadam, the content of micro powder is less than or equal to 2 percent, the water absorption rate is less than or equal to 2 percent, and the crushing index is less than or equal to 20 percent; in the tailing waste rock, the content of micro powder is less than or equal to 2 percent, the water absorption rate is less than or equal to 2 percent, and the crushing index is less than or equal to 20 percent; in the recycled coarse aggregate, the content of micro powder is less than or equal to 2 percent, the water absorption rate is less than or equal to 5 percent, and the crushing index is less than or equal to 14 percent.
3. The industrial solid waste concrete for the prefabricated parts according to claim 1 or 2, wherein the admixture is a polycarboxylic acid water reducing agent; the cement used was 42.5 portland cement.
4. The industrial solid waste concrete for the prefabricated part according to claim 1 or 2, wherein the concrete comprises 220 to 280 parts of cement, 90 to 200 parts of a composite admixture, 740 to 790 parts of fine aggregate, 1070 to 1130 parts of coarse aggregate, 7.5 to 8 parts of an admixture and 140 to 160 parts of water.
5. The industrial solid waste concrete for the prefabricated part according to claim 4, wherein the concrete comprises 228 to 240 parts of cement, 160 to 200 parts of composite admixture, 740 to 780 parts of fine aggregate, 1070 to 1130 parts of coarse aggregate, 7.6 to 8 parts of admixture and 144 to 152 parts of water.
6. The method for preparing industrial solid waste concrete for prefabricated parts according to any one of claims 1 to 5, wherein the cement, the composite admixture, the fine aggregate, the coarse aggregate, the admixture and the water are mixed in a ratio, and the preparation comprises:
1) mixing the steel slag powder, the fly ash, the regenerated powder and the desulfurized gypsum according to the proportion to obtain the composite admixture;
2) mixing the tailing fine aggregate, the recycled fine aggregate, the natural river sand, the composite admixture and the cement, stirring for the first time, adding the recycled coarse aggregate, the tailing waste stone and the natural macadam, and stirring for the second time to obtain a dry material;
3) adding a proper amount of water and an additive into the dry materials, and stirring for the first time; and adding the rest water and the additive, stirring for the second time, and discharging to obtain the water-based paint.
7. The method for preparing industrial solid waste concrete for prefabricated parts according to claim 6, wherein in the step 2), feeding is performed according to the sequence of tailing fine aggregate, recycled fine aggregate, natural river sand, composite admixture and cement; the primary stirring time is 20-40 s; the secondary stirring time is 20-40 s; in the step 3), the amount of the first water addition is 50-70%; the amount of the additive added for the first time is 50-70%; the primary stirring time is 0.5-1.5 min; the secondary stirring time is 1-3 min.
8. Use of the industrial solid waste concrete for the prefabricated part according to any one of claims 1 to 5 or the industrial solid waste concrete for the prefabricated part obtained by the preparation method according to claim 6 or 7 in preparation of a large-volume solid waste concrete prefabricated staircase and a large-volume solid waste concrete prefabricated laminated slab.
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| CN116082003A (en) * | 2023-02-23 | 2023-05-09 | 常州大学 | Machine-made sand recycled concrete of composite floor slab member and preparation method thereof |
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