CN111718161B - Concrete with multiple doped steel wastes - Google Patents
Concrete with multiple doped steel wastes Download PDFInfo
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- CN111718161B CN111718161B CN202010630944.2A CN202010630944A CN111718161B CN 111718161 B CN111718161 B CN 111718161B CN 202010630944 A CN202010630944 A CN 202010630944A CN 111718161 B CN111718161 B CN 111718161B
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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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
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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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/144—Slags from the production of specific metals other than iron or of specific alloys, e.g. ferrochrome 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
- 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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- 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 & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The raw materials of the concrete with the steel waste doped more comprise coarse aggregate, fine aggregate, fiber material, cement, a water reducing agent, water and bicarbonate soluble to the water, wherein the coarse aggregate comprises nickel slag, steel slag and broken stone, the fine aggregate comprises river sand and steel slag magnetic separation tailings, and the dosage of the bicarbonate is as follows: 10-20g/m 2 The bicarbonate is measured on the basis of the surface area of the fiber material; the fiber material is pretreated by lime water solution. In the concrete technology for recycling solid wastes, aiming at the physicochemical characteristics of solid wastes such as steel slag, nickel slag and the like, the scheme of the invention designs the concrete technology for triggering the self components to participate in the reaction by utilizing the induction reaction, fully exciting and utilizing the hydration activity of the components, thereby obtaining the concrete with excellent performance, effectively structuring the solid wastes such as the steel slag and the like, and realizing the recycling of waste resources.
Description
Technical Field
The invention belongs to the technical field of building concrete, and particularly relates to a multi-doped steel waste concrete for recycling solid waste resources such as steel slag, nickel slag, steel scrap fiber and the like.
Background
The steel slag, the nickel slag, the steel scrap fiber and the like are solid wastes with huge inventory in China, and have certain application in the fields of cement production, brick making, concrete aggregate and the like at present.
The steel slag is industrial solid waste, is slag discharged from steel making, and is divided into converter slag, open furnace slag and electric furnace slag according to furnace types. Mainly comprises calcium, iron, silicon, magnesium and a small amount of oxides of aluminum, manganese, phosphorus and the like.
The main mineral phases of the calcium-magnesium-calcium-phosphate composite material are solid melts formed by tricalcium silicate, dicalcium silicate, calcium forsterite, calcium magnesium roseptite, calcium aluminoferrite and oxides of silicon, magnesium, iron, manganese and phosphorus, and a small amount of free calcium oxide, metallic iron, fluorapatite and the like. In some regions, the ore contains titanium and vanadium, and the steel slag contains a little of these components. The contents of various components in the steel slag are greatly different according to the type of the steel-making furnace, the steel type and the steel smelting stage of each furnace.
The steel slag is formed at the temperature of 1500-1700 ℃, is liquid at high temperature, and is in a block shape after being slowly cooled, and is generally dark gray and dark brown. Sometimes, the contained free calcium and magnesium oxides are converted into hydroxide through reaction with water or moisture, so that the slag blocks expand in volume and are broken; sometimes, the calcium silicate contained in a large amount is cracked by the transformation from the beta-form to the gamma-form during cooling (at approximately 675 ℃). If the liquid steel slag is treated with a proper amount of water, the steel slag can be quenched into granules.
The nickel slag is solid waste slag generated in the smelting of ferronickel, which is mainly used for stainless steel production, and therefore, the nickel slag is also called stainless steel slag or ferronickel slag. The nickel slag is divided into dry slag, water slag, high nickel slag, low nickel slag and other different types. The nickel-iron alloy contained in the dry slag is higher, the nickel-iron alloy content in the granulated slag is lower, and the nickel-iron alloy content in the high-nickel slag is high and hardly magnetized. The nickel-iron alloy in the low-nickel slag has low nickel content and high magnetic permeability.
According to the relevant performance criteria, in the concrete related art, the upper limit of the nominal size fraction in the coarse aggregate is called the maximum particle size. For the traditional aggregate, when the particle size of the aggregate is increased, the specific surface area is reduced, and the cement consumption of concrete is also reduced, so that the maximum particle size of the coarse aggregate is selected to be larger as much as possible on the premise of meeting the technical requirements. In reinforced concrete engineering, the particle size of the coarse aggregate is not more than 1/4 which is the smallest dimension of the section of the concrete structure and not more than 3/4 which is the smallest clear distance of the steel bars. The maximum grain size of the concrete solid slab should not be larger than 1/3, which is the thickness of the slab, and should not exceed 40 mm. The broken stones for pumping concrete should not be larger than 1/3 of the inner diameter of the conveying pipe, and the pebbles should not be larger than 1/2.5 of the inner diameter of the conveying pipe. In the application of the solid waste in concrete aggregate, the solid waste has large porosity and hard crushing related to nickel slag, for example, due to the consideration of the reasons; the steel slag has complex components, easy volume retraction and low hydration activity of the magnesium oxide-containing component; the steel scrap fiber has fluffy surface due to corrosion and the like, so that the compact structure of the concrete is influenced, and the application amount of the steel scrap fiber in the concrete is low.
Disclosure of Invention
The invention aims to provide the concrete with the steel waste, which triggers the self components to participate in the reaction by utilizing the induction reaction, fully excites and utilizes the hydration activity of the concrete, thereby obtaining the concrete with excellent performance, effectively solving the problem of solid wastes such as steel slag and the like, and realizing the reutilization of waste resources.
The pretreatment related to the scheme can be performed by adopting the modes of solution soaking, spray soaking, slurry coating, dry material mixing and the like.
The invention discloses a steel waste concrete with multiple adulterations, which comprises the following raw materials of coarse aggregate, fine aggregate, fiber material, cement, water reducing agent, water and bicarbonate which is soluble to water, wherein the coarse aggregate comprises nickel slag, steel slag and broken stone, the fine aggregate comprises river sand and steel slag magnetic separation tailings, and the dosage of the bicarbonate is as follows: 10-20g/m 2 The bicarbonate is measured on the basis of the surface area of the fiber material (e.g. a portion of concrete added with a total surface area of 2m 2 When the fiber material is used, the dosage is 10g/m 2 The addition amount of carbonate in the part of concrete is 20 g); the fiber material is pretreated by lime water solution (after pretreatment, bicarbonate is taken as a raw material when concrete is mixed and then is solidified with other raw materials, and the reaction is further carried out). Preferably, the fiber material is steel fiber (including waste steel wire, etc., such as waste iron wire, tyre wire, etc., the rusted part on the surface is not treated, and does not need to be treated by reagents such as acid, etc., but the surface structural form of the rusted part is utilized, so that the activation performance is improved, and the fiber material is also beneficial to overcoming the problems that the surface material of the nickel slag is high in smoothness and not beneficial to mixing, etc. in the stirring and forming process). The solution, which uses fiber material, is mainly related to the surface area of the fiber material, so that the amount of bicarbonate is also related to the amount of bicarbonate, especially steel scrap fiber, which generally has a rusted surfaceAfter the lime water is pretreated, enough hydrated lime is adsorbed on the surface of the lime water, and the operation is completed before concrete mixing and stirring, so that in the mixing and stirring process, mixing and reaction are carried out along with the addition of bicarbonate, and a calcium bicarbonate intermediate product is produced, so that the surface structure of the fiber material can be filled, and a reinforced structure with more effective and stable filling form is obtained. Meanwhile, a small amount of strong base generated after reaction can further excite the silicon compound in the concrete, thereby further improving the hydration activity. Further, the aqueous lime solution for pretreating the fiber material is saturated lime water. And excessive hydrated lime is added into the lime water to form supplement, so that sufficient deposition can be effectively carried out on the surface of the fiber material, and the reaction after mixing is facilitated.
The invention discloses an improvement of a multi-doped steel waste concrete, wherein the size of a coarse aggregate is 5-60 mm.
The invention discloses an improvement of a multi-doped steel waste concrete, wherein the size of a fine aggregate is 0.15mm-4.75 mm.
The invention discloses an improvement of multi-doped steel waste concrete, which is characterized in that steel slag and partial steel slag magnetic separation tailings accounting for 30-40% of the total mass of the steel slag magnetic separation tailings are mixed and pretreated by water-soluble bisulfate. Preferably, the particle size of the steel slag magnetic separation tailings in the fine aggregate is 0.15mm-0.2 mm. The small-particle fine aggregate has stronger activity, particularly calcium oxide, silicate components and the like in the small-particle fine aggregate, and can effectively overcome the defect of high void ratio of steel slag and nickel slag through the filling effect so as to improve the generation of a cavity structure in a concrete structure, thereby integrally improving the structural strength of the concrete. And the pretreatment work of the bisulfate is matched, so that the reaction of hydrogen ion induction and calcium oxide components is effectively provided, and sulfate ions are provided in a matched manner to further form gypsum components, so that the filling and enhancing performance of the steel slag is improved, and meanwhile, hydrogen ions can participate in activation in the mixing process and finally balance the acid-base environment formed in the mixing process. In addition, the formed gypsum component has better dispersibility, and can also improve the early strength performance of the concrete to a certain extent.
The invention discloses an improvement of a multi-doped steel waste concrete, wherein bicarbonate is sodium bicarbonate or potassium bicarbonate.
The invention discloses an improvement of multi-doped steel waste concrete, wherein the dosage of bisulfate is 30-50g/100kg by taking the total mass of steel slag magnetic separation tailings as reference. If the total mass of the steel slag magnetic separation tailings with the weight of 200kg is added into a certain part of concrete, the dosage is 50g/100kg, and the addition amount of the hydrogen sulfate in the part of concrete is 100 g. The selection refers to that the steel slag magnetic separation tailings have fine particle forms, so that the functional components in the steel slag have stronger activity, and the surface part of the rest coarse aggregate steel slag is generally considered, so that the steel slag magnetic separation tailings are considered in the early stage to judge the dosage of the bisulfate. In addition, after the nickel slag is introduced by matching with the bisulfate, the hydration performance of the nickel slag is further improved.
The invention discloses an improvement of a multi-doped steel waste concrete, wherein the bisulfate is sodium bisulfate or potassium bisulfate.
The scheme provides feasibility for doping a large amount of wastes such as steel slag, nickel slag and the like in the concrete, and can effectively ensure the quality of concrete products while realizing the resource utilization of solid wastes.
Detailed Description
The present invention will be described in detail below with reference to various embodiments. The embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are included in the scope of the present invention.
The following examples are included, but not limited to, only to demonstrate that the application of the scheme in different multi-doped steel waste concrete can meet the performance requirements of concrete products when the substitution amount of nickel slag and steel slag in coarse aggregate is more than 30%.
In the implementation of the scheme, GB50081-2002 standard of mechanical property test method for common concrete is adopted to measure the compressive strength of the concrete test block. The shrinkage rate of the concrete test block is determined by GB50082-2009 test method Standard for Long-term Performance and durability of ordinary concrete. The observation of the surface morphology was performed under normal maintenance.
Example set one
The basic raw materials of the concrete in the group comprise: 30-50 parts of cement, 60-80 parts of fine aggregate, 70-100 parts of coarse aggregate, 5-10 parts of waste fiber, 10-20 parts of water and 0.5-1 part of water reducing agent. Wherein the water reducing agent is a polycarboxylic acid water reducing agent. Wherein the fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30-60% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 10-20% of the total mass of the coarse aggregate and steel slag accounting for 20-40% of the total mass of the coarse aggregate. The waste fiber is waste tyre reinforcing steel wire. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30-60% of the total mass of the fine aggregate, wherein the steel slag magnetic separation tailings form 0.15-0.2 mm-grade fine aggregate, and the river sand forms 0.3-4.5 mm-grade ingredients. The coarse aggregate comprises broken stone, nickel slag accounting for 10-20% of the total mass of the coarse aggregate and steel slag accounting for 20-40% of the total mass of the coarse aggregate, wherein the steel slag forms 20-30mm graded aggregate, the nickel slag forms 30-60mm graded aggregate, the broken stone forms 5-15mm graded aggregate, and the three types of aggregate form a coarse aggregate grading system together.
Example 101
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 30 parts of cement, 60 parts of fine aggregate, 70 parts of coarse aggregate, 5 parts of waste fiber, 10 parts of water, 0.5 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a polycarboxylic acid water reducing agent. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 10% of the total mass of the coarse aggregate and steel slag accounting for 20% of the total mass of the coarse aggregate. The waste fiber is a recycled product of waste tire reinforcing steel wire, and the surface area of each weight part of waste fiber is calculated to be about 40m 2 The amount of the bicarbonate added is 10g/m 2 In this case, the amount of the bicarbonate to be added is about 400g per part by weight of the waste fibers, and this example is potassium bicarbonate.
In the embodiment, the recycled product of the waste tire reinforcing steel wire is soaked in saturated lime water solution for more than 30min in advance, then coarse aggregate, fine aggregate, fiber material, cement, water reducing agent, water and potassium bicarbonate are mixed together in a stirrer to obtain a concrete finished product, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, a test sample is extracted, and a test sample is obtained.
Example 102
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 40 parts of cement, 70 parts of fine aggregate, 85 parts of coarse aggregate, 8 parts of waste fiber, 15 parts of water, 0.75 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a polycarboxylic acid water reducing agent. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 50% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 15% of the total mass of the coarse aggregate and steel slag accounting for 30% of the total mass of the coarse aggregate. The waste fiber is a recycled product of waste tire reinforcing steel wire, and the surface area of each weight part of waste fiber is calculated to be about 40m 2 The amount of the bicarbonate added is 15g/m 2 In this case, the amount of the hydrogencarbonate added per part by weight of the waste fibers was about 600g, in this example potassium hydrogencarbonate.
In the embodiment, the recycled product of the waste tire reinforcing steel wire is soaked in saturated lime water solution for more than 30min in advance, then coarse aggregate, fine aggregate, fiber material, cement, water reducing agent, water and potassium bicarbonate are mixed together in a stirrer to obtain a concrete finished product, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, a test sample is extracted, and a test sample is obtained.
Example 103
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 50 parts of cement, 80 parts of fine aggregate, 100 parts of coarse aggregate, 10 parts of waste fiber, 20 parts of water, 1 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a polycarboxylic acid water reducing agent. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30-60% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 20% of the total mass of the coarse aggregate and steel slag accounting for 40% of the total mass of the coarse aggregate. The waste fiber is a recycled product of waste tire reinforcing steel wire, and the surface area of each weight part of waste fiber is calculated to be about 40m 2 The amount of the bicarbonate added is 20g/m 2 In this case, the amount of the bicarbonate to be added per part by weight of the waste fibers is about 800g, in this case potassium bicarbonate.
In the embodiment, the recycled product of the waste tire reinforcing steel wire is soaked in saturated lime water solution for more than 30min in advance, then coarse aggregate, fine aggregate, fiber material, cement, water reducing agent, water and potassium bicarbonate are mixed together in a stirrer to obtain a concrete finished product, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, a test sample is extracted, and a test sample is obtained.
Example 104
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 30 parts of cement, 60 parts of fine aggregate, 70 parts of coarse aggregate, 5 parts of waste fiber, 10 parts of water, 0.5 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a polycarboxylic acid water reducing agent. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 10% of the total mass of the coarse aggregate and steel slag accounting for 20% of the total mass of the coarse aggregate. The waste fiber is a recycled product of waste tire reinforcing steel wire, and the surface area of each weight part of waste fiber is calculated to be about 40m 2 The amount of the bicarbonate added is 10-20g/m 2 In this case, the amount of the bicarbonate per part by weight of the waste fibers is about 400-800g, in this case potassium bicarbonate. In addition, the steel slag is mixed with partial steel slag magnetic separation tailings accounting for 30-40% of the total mass of the steel slag magnetic separation tailings and is pretreated by water-soluble bisulfate. The dosage of the bisulfate is 50g/100kg by taking the total mass of the steel slag magnetic separation tailings as a reference, and the embodiment is potassium bisulfate.
In the embodiment, the recycled product of the waste tire reinforcing steel wire is soaked in saturated lime water solution for more than 30min in advance, then the coarse aggregate, the fine aggregate, the fiber material, the cement, the water reducing agent, the water and the potassium bicarbonate are mixed together in a stirrer to be stirred to obtain a concrete finished product, a prefabricated product is obtained by pouring, a test sample is extracted to obtain a test sample.
Example 105
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 40 parts of cement, 70 parts of fine aggregate, 85 parts of coarse aggregate, 8 parts of waste fiber, 15 parts of water, 0.75 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a polycarboxylic acid water reducing agent. The fine aggregate comprises river sand and is in the total amount of the fine aggregate50% of steel slag magnetic separation tailings. The coarse aggregate comprises broken stone, nickel slag accounting for 15% of the total mass of the coarse aggregate and steel slag accounting for 30% of the total mass of the coarse aggregate. The waste fiber is a recycled product of waste tire reinforcing steel wire, and the surface area of each weight part of waste fiber is calculated to be about 40m 2 The amount of the bicarbonate added is 10-20g/m 2 In this case, the amount of the bicarbonate per part by weight of the waste fibers is about 400-800g, in this case potassium bicarbonate. In addition, the steel slag is mixed with partial steel slag magnetic separation tailings accounting for 30-40% of the total mass of the steel slag magnetic separation tailings and is pretreated by water-soluble bisulfate. The dosage of the bisulfate is 30g/100kg by taking the total mass of the steel slag magnetic separation tailings as a reference, and the embodiment is potassium bisulfate.
In the embodiment, the recycled product of the waste tire reinforcing steel wire is soaked in saturated lime water solution for more than 30min in advance, then the coarse aggregate, the fine aggregate, the fiber material, the cement, the water reducing agent, the water and the potassium bicarbonate are mixed together in a stirrer to be stirred to obtain a concrete finished product, a prefabricated product is obtained by pouring, a test sample is extracted to obtain a test sample.
Comparative example 111
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 30 parts of cement, 60 parts of fine aggregate, 70 parts of coarse aggregate, 5 parts of waste fiber, 10 parts of water and 0.5 part of water reducing agent. Wherein the water reducing agent is a polycarboxylic acid water reducing agent. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 10% of the total mass of the coarse aggregate and steel slag accounting for 20% of the total mass of the coarse aggregate. The waste fiber is a recovery product of waste tire reinforcing steel wires.
In the embodiment, coarse aggregate, fine aggregate, fiber material, cement, water reducer and water are mixed together in a stirrer, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, and a test sample is extracted to obtain a test sample.
Sample Performance test data for the foregoing examples and comparative examples are as follows (3 batches for each sample, 5 samples for each batch, data averaged)
Example group two
The basic raw materials of the concrete in the group comprise: 35-45 parts of ordinary portland cement, 40-68 parts of fine aggregate, 65-95 parts of coarse aggregate, 5-10 parts of waste fiber, 15-26 parts of water, 6-8 parts of fly ash and 0.5-1 part of a water reducing agent. Wherein the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent and other conventional commercial water reducing agents. Wherein the fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30-60% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 10-20% of the total mass of the coarse aggregate and steel slag accounting for 20-40% of the total mass of the coarse aggregate. The waste fiber is waste steel wire for binding. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30-60% of the total mass of the fine aggregate, wherein the steel slag magnetic separation tailings form 0.15-0.2 mm-grade fine aggregate, and the river sand forms 0.3-4.5 mm-grade ingredients. The coarse aggregate comprises broken stone, nickel slag accounting for 10-20% of the total mass of the coarse aggregate and steel slag accounting for 20-40% of the total mass of the coarse aggregate, wherein the steel slag forms 20-30mm graded aggregate, the nickel slag forms 30-60mm graded aggregate, the broken stone forms 5-15mm graded aggregate, and the three types of aggregate form a coarse aggregate grading system together.
Example 201
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 35 parts of ordinary portland cement, 68 parts of fine aggregate, 95 parts of coarse aggregate, 5 parts of waste fiber, 20 parts of water, 6 parts of fly ash, 0.8 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent and other conventional commercial water reducing agents. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 15% of the total mass of the coarse aggregate and steel slag accounting for 40% of the total mass of the coarse aggregate. The waste fiber is used as binding waste steel wire, and the surface area of each weight of waste fiber is calculated to be about 40m 2 The amount of the bicarbonate added is 10g/m 2 In this case, the amount of the bicarbonate added per part by weight of the waste fibers is about 400g, in this case sodium bicarbonate.
In the embodiment, the binding waste steel wires are soaked in saturated lime water solution for more than 30min in advance, then coarse aggregate, fine aggregate, fiber material, cement, water reducing agent, water and potassium bicarbonate are mixed together in a stirrer to obtain a concrete finished product, a prefabricated product is obtained by pouring, and a test sample is extracted to obtain a test sample.
Example 202
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 45 parts of ordinary portland cement, 50 parts of fine aggregate, 65 parts of coarse aggregate, 7 parts of waste fiber, 15 parts of water, 8 parts of fly ash, 0.5 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent and other conventional commercial water reducing agents. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 60% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 20% of the total mass of the coarse aggregate and steel slag accounting for 30% of the total mass of the coarse aggregate. The waste fiber is used as binding waste steel wire, and the surface area of each weight of waste fiber is calculated to be about 40m 2 The amount of the bicarbonate added was 14g/m 2 In this case, the amount of the bicarbonate added per part by weight of the waste fibers is about 560g, in this case sodium bicarbonate.
In the embodiment, the binding waste steel wires are soaked in saturated lime water solution for more than 30min in advance, then coarse aggregate, fine aggregate, fiber material, cement, water reducing agent, water and potassium bicarbonate are mixed together in a stirrer to obtain a concrete finished product, a prefabricated product is obtained by pouring, and a test sample is extracted to obtain a test sample.
Example 203
The concrete in the embodiment comprises the following raw materials in parts by weight of 100 kg: 38 parts of ordinary portland cement, 40 parts of fine aggregate, 80 parts of coarse aggregate, 10 parts of waste fiber, 26 parts of water, 7 parts of fly ash, 1 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent and other conventional commercial water reducing agents. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 50% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 10% of the total mass of the coarse aggregate and steel slag accounting for 20% of the total mass of the coarse aggregate. The waste fiber is used as binding waste steel wire, and the weight of each part of waste fiber is calculatedThe surface area is about 40m 2 The amount of the bicarbonate added is 20g/m 2 In this case, the amount of the bicarbonate to be added is about 800g per part by weight of the waste fibers, and this is sodium bicarbonate in this example.
In the embodiment, the binding waste steel wires are soaked in saturated lime water solution for more than 30min in advance, then coarse aggregate, fine aggregate, fiber material, cement, water reducing agent, water and potassium bicarbonate are mixed together in a stirrer to obtain a concrete finished product, a prefabricated product is obtained by pouring, and a test sample is extracted to obtain a test sample.
Example 204
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 35 parts of ordinary portland cement, 68 parts of fine aggregate, 95 parts of coarse aggregate, 5 parts of waste fiber, 20 parts of water, 6 parts of fly ash, 0.8 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent and other conventional commercial water reducing agents. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 15% of the total mass of the coarse aggregate and steel slag accounting for 40% of the total mass of the coarse aggregate. The waste fiber is used as binding waste steel wire, and the surface area of each weight of waste fiber is calculated to be about 40m 2 The amount of the bicarbonate added is 10g/m 2 In this case, the amount of the bicarbonate added per part by weight of the waste fibers is about 400g, in this case sodium bicarbonate. In addition, the steel slag is mixed with partial steel slag magnetic separation tailings accounting for 30-40% of the total mass of the steel slag magnetic separation tailings and is pretreated by water-soluble bisulfate. The dosage of the bisulfate is 40g/100Kg by taking the total mass of the steel slag magnetic separation tailings as a reference, and the embodiment is sodium bisulfate.
In the embodiment, the binding waste steel wires are soaked in saturated lime water solution for more than 30min in advance, then the coarse aggregate, the fine aggregate, the fiber material, the cement, the water reducing agent, the water and the potassium bicarbonate are mixed together in a stirrer to obtain a concrete finished product, a precast product is obtained by pouring, and a test sample is extracted to obtain a test sample.
Example 205
The concrete in this example comprises, per weight, the following raw materialsMeasured in 100 kg: 45 parts of ordinary portland cement, 50 parts of fine aggregate, 65 parts of coarse aggregate, 7 parts of waste fiber, 15 parts of water, 8 parts of fly ash, 0.5 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent and other conventional commercial water reducing agents. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 60 percent of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 20% of the total mass of the coarse aggregate and steel slag accounting for 30% of the total mass of the coarse aggregate. The waste fiber is used as binding waste steel wire, and the surface area of each weight of waste fiber is calculated to be about 40m 2 The amount of the bicarbonate added was 14g/m 2 In this case, the amount of the bicarbonate added per part by weight of the waste fibers is about 560g, in this case sodium bicarbonate. In addition, the steel slag is mixed with partial steel slag magnetic separation tailings accounting for 30-40% of the total mass of the steel slag magnetic separation tailings and is pretreated by water-soluble bisulfate. The dosage of the bisulfate is 40g/100kg by taking the total mass of the magnetic separation tailings of the steel slag as reference, and the embodiment is sodium bisulfate.
In the embodiment, the binding waste steel wires are soaked in saturated lime water solution for more than 30min in advance, then the coarse aggregate, the fine aggregate, the fiber material, the cement, the water reducing agent, the water and the potassium bicarbonate are mixed together in a stirrer to obtain a concrete finished product, a precast product is obtained by pouring, and a test sample is extracted to obtain a test sample.
Comparative example 211
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 45 parts of ordinary portland cement, 50 parts of fine aggregate, 65 parts of coarse aggregate, 7 parts of waste fiber, 15 parts of water, 8 parts of fly ash and 0.5 part of water reducing agent. Wherein the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent and other conventional commercial water reducing agents. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 60% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 20% of the total mass of the coarse aggregate and steel slag accounting for 30% of the total mass of the coarse aggregate. The waste fiber is waste steel wire for binding.
In the embodiment, the raw materials are mixed together in a stirrer, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, and a test sample is obtained by extracting the sample.
Sample Performance test data for the foregoing examples and comparative examples are as follows (3 batches for each sample, 5 samples for each batch, data averaged)
Example group three
The basic raw materials of the concrete in the group comprise: 40-50 parts of cement, 66-76 parts of fine aggregate, 100-120 parts of coarse aggregate, 5-10 parts of waste fiber, 16-18 parts of water and 0.5-1 part of water reducing agent. Wherein the water reducing agent is a naphthalene water reducing agent. Wherein the fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30-60% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 10-20% of the total mass of the coarse aggregate and steel slag accounting for 20-40% of the total mass of the coarse aggregate. The waste fiber is waste iron wire. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30-60% of the total mass of the fine aggregate, wherein the steel slag magnetic separation tailings form 0.15-0.2 mm-grade fine aggregate, and the river sand forms 0.3-4.5 mm-grade ingredients. The coarse aggregate comprises broken stone, nickel slag accounting for 10-20% of the total mass of the coarse aggregate and steel slag accounting for 20-40% of the total mass of the coarse aggregate, wherein the steel slag forms 20-30mm graded aggregate, the nickel slag forms 30-60mm graded aggregate, the broken stone forms 5-15mm graded aggregate, and the three types of aggregate form a coarse aggregate grading system together.
Example 301
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 45 parts of cement, 66 parts of fine aggregate, 120 parts of coarse aggregate, 5 parts of waste fiber, 16 parts of water, 0.5 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a naphthalene water reducing agent. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 60% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 20% of the total mass of the coarse aggregate and steel slag accounting for 20% of the total mass of the coarse aggregate. The waste fiber is waste iron wire, and the surface area of each weight part of waste fiber is calculated to be about 30m 2 The amount of the bicarbonate added is 10g/m 2 In this case, the amount of the bicarbonate to be added is about 300g per part by weight of the waste fibers, and this example is potassium bicarbonate.
In the embodiment, the waste iron wire is soaked in a saturated lime water solution for more than 30min in advance, then coarse aggregate, fine aggregate, fiber material, cement, a water reducing agent, water and potassium bicarbonate are mixed together in a stirrer, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, a sample is extracted, and a test sample is obtained.
Example 302
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 40 parts of cement, 76 parts of fine aggregate, 100 parts of coarse aggregate, 8 parts of waste fiber, 17 parts of water, 0.7 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a naphthalene water reducing agent. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 40% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 10% of the total mass of the coarse aggregate and steel slag accounting for 30% of the total mass of the coarse aggregate. The waste fiber is waste iron wire, and the surface area of each weight part of waste fiber is calculated to be about 30m 2 The amount of the bicarbonate added is 15g/m 2 In this case, the amount of the bicarbonate added per part by weight of the waste fibers is about 450g, in this case potassium bicarbonate.
In the embodiment, the waste iron wire is soaked in a saturated lime water solution for more than 30min in advance, then coarse aggregate, fine aggregate, fiber material, cement, a water reducing agent, water and potassium bicarbonate are mixed together in a stirrer, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, a sample is extracted, and a test sample is obtained.
Example 303
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 50 parts of cement, 70 parts of fine aggregate, 110 parts of coarse aggregate, 10 parts of waste fiber, 18 parts of water, 1 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a naphthalene water reducing agent. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 19 percent of the total mass of the coarse aggregate and steel slag accounting for 40 percent of the total mass of the coarse aggregate. The waste fiber is waste iron wire, and the surface area of each weight part of waste fiber is calculated to be about 30m 2 The amount of the bicarbonate added is 20g/m 2 When the temperature of the water is higher than the set temperature,the amount of bicarbonate added per weight of waste fibre is about 600g, in this case potassium bicarbonate.
In the embodiment, the waste iron wire is soaked in a saturated lime water solution for more than 30min in advance, then coarse aggregate, fine aggregate, fiber material, cement, a water reducing agent, water and potassium bicarbonate are mixed together in a stirrer, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, a sample is extracted, and a test sample is obtained.
Example 304
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 45 parts of cement, 66 parts of fine aggregate, 120 parts of coarse aggregate, 5 parts of waste fiber, 16 parts of water, 0.5 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is a naphthalene water reducing agent. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 60% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 20% of the total mass of the coarse aggregate and steel slag accounting for 20% of the total mass of the coarse aggregate. The waste fiber is waste iron wire, and the surface area of each weight part of waste fiber is calculated to be about 30m 2 The amount of the bicarbonate added is 10g/m 2 In this case, the amount of the bicarbonate to be added is about 300g per part by weight of the waste fibers, and this example is potassium bicarbonate. In addition, the steel slag is mixed with partial steel slag magnetic separation tailings accounting for 30-40% of the total mass of the steel slag magnetic separation tailings and is pretreated by water-soluble bisulfate. The dosage of the bisulfate is 40g/100kg by taking the total mass of the steel slag magnetic separation tailings as a reference, and the embodiment is potassium bisulfate.
In the embodiment, the waste iron wire is soaked in a saturated lime water solution for more than 30min in advance, then the coarse aggregate, the fine aggregate, the fiber material, the cement, the water reducing agent, the water and the potassium bicarbonate are mixed together in a stirrer, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, and a test sample is extracted to obtain a test sample.
Example 305
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 40 parts of cement, 76 parts of fine aggregate, 100 parts of coarse aggregate, 8 parts of waste fiber, 17 parts of water, 0.7 part of water reducing agent and a proper amount of bicarbonate. Wherein the water reducing agent is naphthalene water reducing agentAnd (3) preparing. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 40% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 10% of the total mass of the coarse aggregate and steel slag accounting for 30% of the total mass of the coarse aggregate. The waste fiber is waste iron wire, and the surface area of each weight part of waste fiber is calculated to be about 30m 2 The amount of the bicarbonate added is 15g/m 2 In this case, the amount of the bicarbonate added per part by weight of the waste fibers is about 450g, in this case potassium bicarbonate. In addition, the steel slag is mixed with partial steel slag magnetic separation tailings accounting for 30-40% of the total mass of the steel slag magnetic separation tailings and is pretreated by water-soluble bisulfate. The dosage of the bisulfate is 35g/100Kg by taking the total mass of the magnetic separation tailings of the steel slag as a reference, and the embodiment is potassium bisulfate.
In the embodiment, the waste iron wire is soaked in a saturated lime water solution for more than 30min in advance, then the coarse aggregate, the fine aggregate, the fiber material, the cement, the water reducing agent, the water and the potassium bicarbonate are mixed together in a stirrer, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, and a test sample is extracted to obtain a test sample.
Comparative example 311
The concrete in the embodiment comprises the following raw materials in parts by weight, measured in 100 kg: 40 parts of cement, 76 parts of fine aggregate, 100 parts of coarse aggregate, 8 parts of waste fiber, 17 parts of water and 0.7 part of water reducing agent. Wherein the water reducing agent is a naphthalene water reducing agent. The fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 40% of the total mass of the fine aggregate. The coarse aggregate comprises broken stone, nickel slag accounting for 10% of the total mass of the coarse aggregate and steel slag accounting for 30% of the total mass of the coarse aggregate. The waste fiber is waste iron wire.
In the embodiment, the raw materials are mixed together in a stirrer, a concrete finished product is obtained by stirring, a prefabricated product is obtained by pouring, and a test sample is obtained by extracting the sample.
Sample Performance test data for the foregoing examples and comparative examples are as follows (3 batches for each sample, 5 samples for each batch, data averaged)
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The multi-doped steel waste concrete is characterized by comprising, by weight, 30-50 parts of cement, 60-80 parts of fine aggregate, 70-100 parts of coarse aggregate, 5-10 parts of waste fiber, 10-20 parts of water and 0.5-1 part of water reducing agent, wherein the water reducing agent is a polycarboxylic acid water reducing agent, the fine aggregate comprises river sand and steel slag magnetic separation tailings accounting for 30-60% of the total mass of the fine aggregate, the coarse aggregate comprises broken stone, nickel slag accounting for 10-20% of the total mass of the coarse aggregate and steel slag accounting for 20-40% of the total mass of the coarse aggregate, the steel slag forms 20-30mm graded aggregate, the nickel slag forms 30-60mm graded aggregate, and 5-15mm graded aggregate; the raw material also comprises bicarbonate which is soluble to water, and the dosage of the bicarbonate is as follows: 10-20g/m 2 The bicarbonate is measured on the basis of the surface area of the fiber material; the fiber material is pretreated by lime water; the surface area per part by weight of the waste fibers is 30 or 40m 2 Soaking the fiber material in a saturated lime water solution for more than 30min in advance, then mixing the coarse aggregate, the fine aggregate, the fiber material, cement, a water reducing agent, water and bicarbonate in a stirrer together, stirring to obtain a concrete finished product, and pouring to obtain a prefabricated product;
the steel slag and part of steel slag magnetic separation tailings accounting for 30-40% of the total mass of the steel slag magnetic separation tailings are mixed and pretreated by water soluble bisulfate, and the dosage of the bisulfate is 30-50g/100kg by taking the total mass of the steel slag magnetic separation tailings as reference.
2. The multi-doped steel waste concrete according to claim 1, wherein the fiber material is steel fiber.
3. The multi-doped steel waste concrete according to claim 1, wherein the coarse aggregate has a size of 5mm to 60 mm.
4. The heavily doped steel waste concrete according to claim 1, characterized in that the size of the fine aggregate is 0.15mm-4.75 mm.
5. The heavily doped steel waste concrete as claimed in claim 1 or 4, wherein the particle size of the steel slag magnetic separation tailings in the fine aggregate is 0.15mm-0.2 mm.
6. The multi-doped steel waste concrete according to claim 1, wherein the bicarbonate is sodium bicarbonate or potassium bicarbonate.
7. The heavily doped steel waste concrete according to claim 1, wherein the bisulfate salt is sodium bisulfate or potassium bisulfate.
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