CN113754379B - Low-volume-weight iron tailing powder active powder concrete and preparation method thereof - Google Patents
Low-volume-weight iron tailing powder active powder concrete and preparation method thereof Download PDFInfo
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- CN113754379B CN113754379B CN202111102968.1A CN202111102968A CN113754379B CN 113754379 B CN113754379 B CN 113754379B CN 202111102968 A CN202111102968 A CN 202111102968A CN 113754379 B CN113754379 B CN 113754379B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 239000000843 powder Substances 0.000 title claims abstract description 98
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 58
- 239000004567 concrete Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 101
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000004576 sand Substances 0.000 claims abstract description 49
- 239000006004 Quartz sand Substances 0.000 claims abstract description 46
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 239000004568 cement Substances 0.000 claims abstract description 20
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 47
- 239000002245 particle Substances 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims description 10
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 239000008030 superplasticizer Substances 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 239000002910 solid waste Substances 0.000 abstract description 3
- 238000006467 substitution reaction Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 239000004574 high-performance concrete Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 6
- 239000010453 quartz Substances 0.000 description 6
- 238000007605 air drying Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the field of high-performance building materials and application of solid wastes in high-performance concrete, and particularly relates to low-volume-weight iron tailing powder active powder concrete and a preparation method thereof. The low-volume-weight iron tailing powder reactive powder concrete comprises the following raw materials in parts by weight: 200-220 parts of cement, 50-60 parts of silica fume, 112-126 parts of quartz sand coarse sand, 66-74 parts of quartz sand medium sand, 36-40 parts of quartz sand fine sand, 70-76 parts of iron tailing powder, 36-44 parts of water, 32-38 parts of steel fiber and 2-4 parts of water reducer. The invention not only can reduce the cost of the active powder concrete, but also can solve the problem of mass stockpiling of the iron tailings, and in addition, the substitution of the iron tailings improves the compressive strength and the flexural strength of the active powder concrete and reduces the volume weight of the active powder concrete. The iron tailing powder active powder concrete has considerable compressive strength and flexural strength, relatively simple preparation process and low volume weight, and can be used for collision walls, sidewalks and cable cover plates.
Description
Technical Field
The invention belongs to the field of high-performance building materials and application of solid wastes in high-performance concrete, and particularly relates to low-volume-weight iron tailing powder active powder concrete and a preparation method thereof.
Background
The active powder concrete is prepared by performing special curing modes such as steam curing and the like on ultrafine active materials and steel fibers, and comprises the components of cement, silica fume, quartz sand, steel fibers, quartz powder, a water reducing agent and water. The active powder concrete has higher compactness without adding coarse aggregate in the aggregate, and the compressive strength and durability of the active powder concrete are greatly improved. The addition of the fiber material can improve the flexural strength of the reactive powder concrete and improve the brittleness of the reactive powder concrete.
The iron tailings are wastes generated after the ore dressing of iron ores, and belong to low-volume-weight industrial solid wastes. The stockpiling amount of the iron tailings in China is up to billions of tons, which exceeds 30 percent of the total stockpiling amount of the tailings in China, most of the iron tailings are simply stockpiled, the land is occupied, meanwhile, the waste of manpower and property resources is caused, and the harm to the environment is not ignored. At present, the relatively wide tailing utilization ways are to produce building blocks, prepare sand by a preparation machine and the like, but the utilization mode is relatively simple, and the generated added value is generally low, so that the method cannot bring good economic benefits to enterprises.
The invention aims to expand the application path of iron tailings by using iron tailing powder as an active powder component in the active powder concrete and reduce the preparation cost of the active powder concrete to a certain extent.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a low-volume-weight iron tailing powder reactive powder concrete and a preparation method thereof. The invention aims to solve the problem that the dead weight of the structure is larger due to the overhigh volume weight of the conventional reactive powder concrete, improve the strength of the reactive powder concrete and reduce the preparation cost of the reactive powder concrete.
In order to achieve the purpose, the invention adopts the following technical scheme.
The low-volume-weight iron tailing powder reactive powder concrete comprises the following raw materials in parts by weight: 200-220 parts of cement, 50-60 parts of silica fume, 112-126 parts of quartz sand coarse sand, 66-74 parts of quartz sand medium sand, 36-40 parts of quartz sand fine sand, 70-76 parts of iron tailing powder, 36-44 parts of water, 32-38 parts of steel fiber and 2-4 parts of water reducer.
Further, the cement is ordinary portland cement with the reference number of 42.5.
Further, the main chemical components of the iron tailing powder comprise the following components in percentage by weight: siO 2 2 68.75~70.00％、Fe 2 O 3 10.08~12.14％、Al 2 O 3 5.07~6.32％、MgO 4.24~5.16％、CaO 4.30~5.00％、Na 2 0.72 to 1.04 percent of O, and the particle size is larger than 400 meshes.
Further, the main chemical components of the silica fume comprise the following components in percentage by weight: siO 2 2 93.5~94％、MgO 1.20~1.22％、SO 3 0.85~0.90％、CaO 0.80~0.85％、Al 2 O 3 0.70~0.75％、Fe 2 O 3 1.43~1.50％、Na 2 O1.30 to 1.34 percent, and the particle size is larger than 1000 meshes.
Further, the particle size of the quartz sand coarse sand is 0.3-0.6mm, the particle size of the medium sand is 0.15-0.3mm, the particle size of the fine sand is 0-0.15mm, and the quartz sand is SiO 2 White quartz sand with content higher than 95%.
Furthermore, the steel fiber is copper-plated steel fiber with the diameter of 200 to 210 mu m and the length of 12 to 15mm.
Further, the water reducing agent is a Cika 325C type polycarboxylate superplasticizer, and the water reducing rate is 30%.
A preparation method of low volume weight iron tailing powder active powder concrete specifically comprises the following steps:
1. fully wetting the stirrer with water, standing for 10 to 30min, and draining accumulated water in the stirrer.
2. Mixing a release agent with water to obtain a release agent solution, adhering a label to the bottom of a test mold, covering holes at the bottom of the test mold, uniformly coating the release agent solution in the test mold, and standing for 1 to 2h.
3. Spreading the wet material in a tray for air drying, and turning over the air drying material every 20min until the surfaces and the insides of the components are not obviously wet and agglomerated.
4. Weighing the components according to the mass fraction, mixing the water reducing agent with water, and uniformly mixing.
5. Respectively pouring the weighed quartz sand and steel fibers into a stirrer, stirring at a constant speed for 180-210s, observing whether stirring is uniform or not, continuing stirring for 60-120s if stirring is not uniform, adding cement, silica fume and iron tailing powder into the stirrer, stirring at a constant speed for 210-240s, observing whether stirring is uniform or not, and continuing stirring for 120-150s if stirring is not uniform.
6. And starting a stirrer to stir for 180 to 210s, simultaneously pouring half of the uniformly mixed water reducing agent solution in 30 to 45s at a constant speed, pouring the rest of the water reducing agent solution at a constant speed, stirring for 300 to 360s, pouring into a mold after stirring is finished, and vibrating.
7. And (3) standing the poured test piece for 24h to 48h under the conditions of 95% relative humidity and 20 ℃, and then demolding.
8. And (5) putting the demoulded test piece into a steam curing box for steam curing for 72 to 84h.
Further, the mass part ratio of the release agent to water in the step 2 is 1: (2 to 5).
Further, in the step 4, the mass parts of the coarse sand, the medium sand and the fine sand are (0.8-1): (0.4-0.7): 0.3-0.4).
Further, in the step 7, the curing temperature is 75-85 ℃, the initial temperature is 20-25 ℃, the temperature rise and the cooling rate are 15 ℃/h, and accumulated water in the internal steam curing box is drained periodically.
Compared with the prior art, the invention has the beneficial effects of.
According to the invention, the iron tailing powder is used as the active powder to prepare the low-volume-weight active powder concrete instead of quartz powder, so that the cost of the active powder concrete can be reduced, the problem of mass stockpiling of the iron tailings can be solved, the compressive strength and the flexural strength of the active powder concrete are improved by replacing the iron tailings, and the volume weight of the active powder concrete is reduced. The iron tailing powder active powder concrete has considerable compressive strength and flexural strength, relatively simple preparation process and low volume weight, and can be used for anti-collision walls, sidewalks and cable cover plates.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The low volume weight iron tailing powder active powder concrete comprises the following raw materials in parts by weight: 200-220 parts of cement, 50-60 parts of silica fume, 112-126 parts of quartz sand coarse sand, 66-74 parts of quartz sand medium sand, 36-40 parts of quartz sand fine sand, 70-76 parts of iron tailing powder, 36-44 parts of water, 32-38 parts of steel fiber and 2-4 parts of a water reducer.
Further, the cement is ordinary portland cement with the reference number of 42.5.
Further, the main chemical components of the iron tailing powder comprise the following components in percentage by weight: siO 2 2 68.75~70.00％、Fe 2 O 3 10.08~12.14％、Al 2 O 3 5.07~6.32％、MgO 4.24~5.16％、CaO 4.30~5.00％、Na 2 0.72 to 1.04 percent of O, and the particle size is larger than 400 meshes.
Further, the main chemical components of the silica fume comprise the following components in percentage by weight: siO 2 2 93.5~94％、MgO 1.20~1.22％、SO 3 0.85~0.90％、CaO 0.80~0.85％、Al 2 O 3 0.70~0.75％、Fe 2 O 3 1.43~1.50％、Na 2 O1.30 to 1.34 percent, and the particle size is larger than 1000 meshes.
Furthermore, the particle size of the quartz sand coarse sand is 0.3-0.6mm, the particle size of the medium sand is 0.15-0.3mm, the particle size of the fine sand is 0-0.15mm, and the quartz sand is SiO 2 White quartz sand with content higher than 95%.
Furthermore, the steel fiber is copper-plated steel fiber with the diameter of 200 to 210 mu m and the length of 12 to 15mm.
Further, the water reducing agent is a Cika 325C type polycarboxylate superplasticizer, and the water reducing rate is 30%.
A preparation method of low volume weight iron tailing powder active powder concrete specifically comprises the following steps:
1. fully wetting the stirrer with water, standing for 10 to 30min, and draining accumulated water in the stirrer.
2. Mixing a release agent with water to obtain a release agent solution, adhering a label to the bottom of a test mold, covering holes at the bottom of the test mold, uniformly coating the release agent solution in the test mold, and standing for 1 to 2h.
3. Spreading the wet material in a tray for air drying, and turning over the air drying material every 20min until the surfaces and the insides of the components are not obviously wet and agglomerated.
4. Weighing the components according to the mass fraction, mixing the water reducing agent with water, and uniformly mixing.
5. Respectively pouring the weighed quartz sand and steel fibers into a stirrer, stirring at a constant speed for 180-210s, observing whether stirring is uniform or not, continuing stirring for 60-120s if stirring is not uniform, adding cement, silica fume and iron tailing powder into the stirrer, stirring at a constant speed for 210-240s, observing whether stirring is uniform or not, and continuing stirring for 120-150s if stirring is not uniform.
6. And starting a stirrer to stir for 180 to 210s, simultaneously pouring half of the uniformly mixed water reducing agent solution in 30 to 45s at a constant speed, pouring the rest of the water reducing agent solution at a constant speed, stirring for 300 to 360s, pouring into a mold after stirring is finished, and vibrating.
7. And (3) standing the poured test piece for 24h to 48h at the relative humidity of 95% and the temperature of 20 ℃, and then demolding.
8. And (5) putting the demoulded test piece into a steam curing box for steam curing for 72 to 84h.
Further, the mass part ratio of the release agent to water in the step 2 is 1: (2 to 5).
Further, in the step 4, the mass parts of the coarse sand, the medium sand and the fine sand are (0.8-1): (0.4-0.7): 0.3-0.4).
Further, in the step 7, the curing temperature is 75-85 ℃, the initial temperature is 20-25 ℃, the temperature rise and the cooling rate are 15 ℃/h, and accumulated water in the internal steam curing box is drained periodically.
Example 1.
Weighing 112 parts of quartz sand coarse sand, 66 parts of quartz sand medium sand, 36 parts of quartz sand fine sand, 36 parts of steel fiber, 200 parts of cement, 50 parts of silica fume, 70 parts of iron tailing powder, 3 parts of water reducer and 40 parts of water.
Uniformly stirring a water reducing agent and water; putting quartz sand and steel fibers into a stirrer and stirring at a constant speed for 180s; then placing the weighed cement, silica fume and iron tailing powder in a stirrer and stirring at a constant speed for 210s; starting the stirrer to stir for 180s, simultaneously pouring half of the uniformly mixed water reducing agent solution at a constant speed within 30s, pouring the rest water reducing agent solution at a constant speed and stirring for 300s, pouring into a test mold after stirring is finished, and vibrating; and (3) standing the poured test piece for 24 hours under the conditions of 95% relative humidity and 20 ℃, demolding, putting the demolded test piece into a steam curing box for steam curing for 72 hours, wherein the curing temperature is 85 ℃, the initial temperature is 20 ℃, the heating and cooling rates are 15 ℃/h, and taking out the test piece to obtain the low-volume-weight iron tailing powder active powder concrete.
Through determination: the compressive strength of the low volume weight iron tailing powder active powder concrete is as follows: 120MPa; the breaking strength is: 19MPa, volume weight: 2240.
example 2.
Weighing 100 parts of quartz sand coarse sand, 66 parts of quartz sand medium sand, 38 parts of quartz sand fine sand, 36 parts of steel fiber, 220 parts of cement, 50 parts of silica fume and 73 parts of iron tailings powder, weighing 4 parts of water reducing agent and 44 parts of water, and uniformly stirring. Putting quartz sand and steel fibers into a stirrer, stirring at a constant speed for 180s, then putting weighed cement, silica fume and iron tailing powder into the stirrer, stirring at a constant speed for 210s, starting the stirrer, stirring for 210s, simultaneously pouring half of the uniformly mixed water reducing agent solution at a constant speed within 30s, pouring the rest water reducing agent solution at a constant speed, stirring for 330s, pouring into a test mold and vibrating after stirring, standing the poured test piece for 24h under the conditions of 95% relative humidity and 20 ℃, demolding, putting the demolded test piece into a steam curing box, performing steam curing for 72h at the curing temperature of 85 ℃, the initial temperature of 20 ℃, the rising and cooling rate of 15 ℃/h, and taking out the test piece to obtain the iron tailing powder active powder concrete.
Through determination: the compressive strength of the low volume weight iron tailing powder active powder concrete is as follows: 124MPa; the breaking strength is: 21MPa, volume weight: 2270.
example 3.
Weighing 100 parts of quartz sand coarse sand, 66 parts of quartz sand medium sand, 40 parts of quartz sand fine sand, 38 parts of steel fiber, 220 parts of cement, 60 parts of silica fume and 76 parts of iron tailings powder, and weighing 4 parts of water reducing agent and 37 parts of water. Uniformly stirring a water reducing agent and water to prepare a water reducing agent solution; placing quartz sand and steel fibers in a stirrer and stirring at a constant speed for 210s; then placing the weighed cement, silica fume and iron tailing powder in a stirrer and stirring at a constant speed for 240s; starting the stirrer to stir for 210s, simultaneously pouring half of the uniformly mixed water reducing agent solution at a constant speed within 45s, pouring the rest water reducing agent solution at a constant speed and stirring for 330s, pouring into a test mold after stirring is finished, and vibrating; and standing the poured test piece for 24 hours under the conditions of 95% relative humidity and 20 ℃, demolding, putting the demolded test piece into a steam curing box for steam curing for 72 hours, wherein the curing temperature is 85 ℃, the initial temperature is 20 ℃, the temperature rising and reducing rate is 15 ℃/h, and taking out the test block to obtain the iron tailing powder active powder concrete.
Through determination: the compressive strength of the low volume weight iron tailing powder active powder concrete is as follows: 130MPa; the breaking strength is: 23MPa, volume weight: 2300.
comparative example 1.
112 parts of quartz sand coarse sand, 66 parts of quartz sand medium sand, 36 parts of quartz sand fine sand, 36 parts of steel fiber, 200 parts of cement, 50 parts of silica fume, 3 parts of water reducing agent, 40 parts of water and 70 parts of quartz powder with the content of more than 95% and the particle size of 1000 meshes are weighed. The same mixing procedure and curing mechanism as in example 1 were used to obtain a low volume weight reactive powder concrete.
Through determination: the low volume weight reactive powder concrete has the following compression strength: 107MPa, and the breaking strength is as follows: 17MPa, volume weight: 2330.
comparative example 2.
Weighing 100 parts of quartz sand coarse sand, 66 parts of quartz sand medium sand, 38 parts of quartz sand fine sand, 36 parts of steel fiber, 220 parts of cement, 50 parts of silica fume, 73 parts of quartz powder described in comparative example 1, 4 parts of water reducing agent and 44 parts of water. The same mixing procedure and curing mechanism as in example 2 were used to obtain the low volume weight reactive powder concrete.
Through determination: the low volume weight reactive powder concrete has the following compression strength: 112MPa, and the breaking strength is as follows: 19MPa, volume weight: 2350.
comparative example 3.
Weighing 100 parts of quartz sand coarse sand, 66 parts of quartz sand medium sand, 40 parts of quartz sand fine sand, 38 parts of steel fiber, 220 parts of cement, 60 parts of silica fume, 76 parts of quartz powder described in comparative example 1, 4 parts of water reducer and 37 parts of water. The same mixing procedure and curing mechanism as in example 3 were used to obtain a low volume weight reactive powder concrete.
Through determination: the low volume weight reactive powder concrete has the following compression strength: 120MPa, and the breaking strength is as follows: 21MPa, volume weight: 2380.
by comprehensively comparing examples 1 to 3 with comparative examples 1 to 3, after the iron tailing powder completely replaces quartz powder according to the mass ratio, the volume weight of the iron tailing active powder concrete is reduced compared with that of the conventional low volume weight active powder concrete, and the compressive strength and the flexural strength are improved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (4)
1. The low-volume-weight iron tailing powder active powder concrete is characterized by comprising the following raw materials in parts by weight: 200-220 parts of cement, 50-60 parts of silica fume, 112-126 parts of quartz sand coarse sand, 66-74 parts of quartz sand medium sand, 36-40 parts of quartz sand fine sand, 70-76 parts of iron tailing powder, 36-44 parts of water, 32-38 parts of steel fiber and 2-4 parts of water reducer;
the iron tailing powder comprises the following main chemical components in percentage by weight: siO 2 2 68.75~70.00％、Fe 2 O 3 10.08~12.14％、Al 2 O 3 5.07~6.32％、MgO 4.24~5.16％、CaO 4.30~5.00％、Na 2 0.72 to 1.04 percent of O, and the particle size is larger than 400 meshes;
the particle size of the quartz sand coarse sand is 0.3-0.6mm, the particle size of the medium sand is 0.15-0.3mm, the particle size of the fine sand is 0-0.15mm, and the quartz sand is SiO 2 White quartz sand with the content higher than 95 percent;
the preparation method of the low-volume-weight iron tailing powder active powder concrete specifically comprises the following steps:
step 1, fully wetting a stirrer with water, standing for 10 to 30min, and draining accumulated water inside;
step 2, mixing a release agent with water to obtain a release agent solution, adhering a label to the bottom of a test mold, covering holes at the bottom of the test mold, uniformly coating the release agent solution in the test mold, standing for 1 to 2h, wherein the mass part ratio of the release agent to the water is 1: (2 to 5);
step 3, spreading the wet materials in a material tray for airing, and turning over the aired materials every 20min until the surfaces and the interiors of the components are not obviously wet and conglomerated;
step 4, weighing the components according to the mass fraction, mixing the water reducing agent with water, and uniformly mixing, wherein the mass parts of the coarse sand, the medium sand and the fine sand are (0.8-1): (0.4-0.7): 0.3-0.4);
step 5, pouring the weighed quartz sand and steel fibers into a stirrer, stirring at a constant speed for 180 to 210s, observing whether the materials are uniformly stirred or not, if the materials are not uniformly stirred, continuing to stir for 60 to 120s, adding the cement, the silica fume and the iron tailing powder into the stirrer, stirring at a constant speed for 210 to 240s, observing whether the materials are uniformly stirred or not, and continuing to stir for 120 to 150s if the materials are not uniformly stirred;
step 6, starting a stirrer, stirring for 180 to 210s, simultaneously pouring half of the uniformly mixed water reducing agent solution within 30 to 45s at a constant speed, pouring the rest water reducing agent solution at a constant speed, stirring for 300 to 360s, pouring into a test mold after stirring is finished, and vibrating;
step 7, standing the poured test piece for 24h to 48h at the relative humidity of 95% and the temperature of 20 ℃, and then demolding;
and 8, putting the demoulded test piece into a steam curing box, performing steam curing for 72 to 84h, wherein the curing temperature is 75 to 85 ℃, the initial temperature is 20 to 25 ℃, the temperature rise rate is 15 ℃/h, and draining off the accumulated water in the internal steam curing box periodically.
2. The low volume weight iron ore tailings powder reactive powder concrete according to claim 1, wherein the cement is ordinary portland cement designated by 42.5; the steel fiber is a copper-plated steel fiber with the diameter of 200 to 210 mu m and the length of 12 to 15mm.
3. The low volume weight iron tailings powder reactive powder concrete of claim 1, wherein the silica fume comprises the following main chemical components in percentage by weight: siO 2 2 ：93.5~94％、MgO:1.20~1.22％、SO 3 :0.85~0.90％、CaO:0.80~0.85％、Al 2 O 3 ：0.70~0.75％、Fe 2 O 3 :1.43~1.50％、Na 2 O:1.30~1.34 percent, and the grain diameter is larger than 1000 meshes.
4. The low volume weight iron tailings powder reactive powder concrete of claim 1, wherein the water reducing agent is a polycarboxylate superplasticizer of the type Cika 325C, and the water reducing rate is 30%.
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