CN113860814A - Copper tailing powder active powder concrete and preparation method thereof - Google Patents
Copper tailing powder active powder concrete and preparation method thereof Download PDFInfo
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- CN113860814A CN113860814A CN202111101489.8A CN202111101489A CN113860814A CN 113860814 A CN113860814 A CN 113860814A CN 202111101489 A CN202111101489 A CN 202111101489A CN 113860814 A CN113860814 A CN 113860814A
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- 229910052802 copper Inorganic materials 0.000 title claims abstract description 104
- 239000010949 copper Substances 0.000 title claims abstract description 104
- 239000000843 powder Substances 0.000 title claims abstract description 103
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 239000004567 concrete Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000006004 Quartz sand Substances 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 20
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 41
- 239000002245 particle Substances 0.000 claims description 41
- 239000004576 sand Substances 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 14
- 238000011049 filling Methods 0.000 claims description 7
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052681 coesite Inorganic materials 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 229910052682 stishovite Inorganic materials 0.000 claims description 6
- 229910052905 tridymite Inorganic materials 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052745 lead Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 3
- 239000004574 high-performance concrete Substances 0.000 abstract description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000002440 industrial waste Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
Abstract
The invention belongs to the field of application of industrial solid wastes in high-performance concrete and application of road and bridge structures, and mainly relates to copper tailing powder reactive powder concrete and a preparation method thereof. The copper tailing powder reactive powder concrete comprises the following raw materials in parts by weight: 100-120 parts of cement, 25-35 parts of silica fume, 16-22 parts of steel fiber, 107-135 parts of quartz sand, 50-75 parts of copper tailings, 18-26 parts of water and 1-3 parts of a high-efficiency water reducing agent. The copper tailings disclosed by the invention are extremely low in content of harmful substances, and most of mineral components are granular, so that the copper tailings can be closely stacked, the compactness of RPC is effectively improved, and the mechanical property of the RPC is improved. The copper tailing powder active powder concrete disclosed by the invention has considerable compressive strength and flexural strength, can be used for engineering structures such as concrete sound barrier unit plates, highway curb stones and anti-collision walls, and is convenient to construct and low in cost.
Description
Technical Field
The invention belongs to the field of application of industrial solid wastes in high-performance concrete and application of road and bridge structures, and mainly relates to copper tailing powder reactive powder concrete and a preparation method thereof.
Background
Reactive powder concrete, also known as RPC, was first produced in france and has been used to date. The coarse aggregate is removed, and the components such as silica fume, a steel fiber water reducing agent and the like are added, so that the compactness of RPC is improved, the compressive strength index and the durability of the RPC are greatly increased, and the toughness of the RPC is increased by adding the steel fiber, so that the brittleness of the RPC is greatly reduced.
The increasingly updated and diversified development of engineering components. The common strength cement concrete can not meet the requirements of the current members more and more, and in the aspect of the current engineering members, because the manufacturing cost of the reactive powder concrete is higher, the reactive powder concrete has certain difficulty in large-scale utilization, and is worthy of further discussion and research from the aspects of high performance and economic benefit.
The copper tailings are industrial waste residues generated in the process of smelting copper by a pyrogenic process, and belong to industrial solid wastes. According to statistics, the discharge amount of copper slag in China is 4000-5000 ten thousand tons, and the copper slag is a non-ferrous metal with very large discharge amount. The large amount of accumulation not only occupies the land area, but also easily generates acidic and alkaline substances after a long time, and causes irreversible harm to the land and the environment. The method takes the copper slag powder as the fine aggregate component of the active powder concrete to prepare the active powder concrete, increases the utilization rate of the copper tailings, actively responds to the national policy, and reduces the burden on the land environment.
Disclosure of Invention
Based on the technical field of the background, the invention aims to provide copper tailing powder active powder concrete and a preparation method thereof. Not only reduces the cost, but also effectively solves the problems of environmental pollution and land occupation.
In order to achieve the purpose, the invention adopts the following technical scheme.
The copper tailing powder reactive powder concrete comprises the following raw materials in parts by weight: 100-120 parts of cement, 25-35 parts of silica fume, 16-22 parts of steel fiber, 107-135 parts of quartz sand, 50-75 parts of copper tailings, 18-26 parts of water and 1-3 parts of a high-efficiency water reducing agent.
Further, the cement is 42.5 ordinary portland cement.
Further, the steel fiber is a straight steel fiber, the diameter of the straight steel fiber is 200-210 mu m, and the length of the straight steel fiber is 12-14 mm.
Further, the chemical composition content of the silica fume is expressed as follows in percentage: SiO 22：90％-93％、MgO：0.2％-0.4％、C：2％-2.1％、CaO：0.9％-1％、Al2O3：0.7％-0.75％、Fe2O3：0.4％-0.5％、Na2O: 0.1-0.15% and the grain diameter is larger than 1000 meshes.
Further, the quartz sand is SiO2White quartz sand with content higher than 95%.
Further, the chemical composition content of the copper tailing powder is expressed as follows according to percentage: fe: 40% -42% of SiO2：24.3％-24.5％、Ag:32.10％-32.15％、Cu：4.10％-4.20％、Al2O3：1.20％-1.25％、Pb：0.25％-0.30％、CaO：0.65％-0.70％、Na2O：0.10％-0.15％。
Further, the water reducing agent is a Cika high-performance polycarboxylic acid powder water reducing agent, and the water reducing rate is more than or equal to 30%.
A preparation method of copper tailing powder active powder concrete specifically comprises the following steps:
1. and (4) grinding the copper tailings by a ball mill for later use.
2. Wetting the stirrer, and simultaneously uniformly brushing a release agent on the mould (sticking the bottom cavity before smearing to prevent difficult demoulding), and reserving for later use.
3. Adding the prepared copper tailing powder and steel fiber of each particle size fraction into a mixture of cement, silica fume and quartz sand which is mixed for standby in advance, and stirring at a constant speed for 120-180 s.
4. Adding the uniformly stirred water solution of the water reducing agent into the mixed aggregate mixture, stirring at a constant speed for 300-480s, taking out the mixture, immediately measuring the fluidity, and simultaneously filling into a mold and vibrating.
5. And placing the test piece in an environment with the relative humidity of 95% and the temperature condition of 20 ℃, standing for 24h, and then demoulding.
6. And (3) putting the demoulded test piece into a high-temperature steam curing box for high-temperature steam curing for 72 hours, setting the curing temperature to be increased to 85-90 ℃, setting the initial temperature to be 15-20 ℃, and setting the temperature rising and reducing rate to be 15 ℃/h, regularly observing the internal condition of the curing box and draining accumulated water in time.
Further, after the copper tailings in the step 1 are ground, the particle sizes of the copper tailings after being screened by a vibrating screen are divided into three size fractions of 0.6mm-0.3mm, 0.3mm-0.15mm and less than 0.15mm, and the proportion of the copper tailings of the three size fractions is (0.6-1.2): (1.3-2.4): 1.9-2.8).
Further, in the step 3, the particle size of the fine quartz sand is 0.3-0.6mm, the particle size of the medium fine sand is 0.15-0.3mm, the particle size of the extra fine sand is less than 0.15mm, and the proportion of the medium fine sand, the extra fine sand and the extra fine sand is as follows: (2.2-2.7), (1.2-1.5) and (1.6-1.9).
Compared with the prior art, the invention has the following beneficial effects.
(1) The copper tailings disclosed by the invention are extremely low in content of harmful substances, and most of mineral components are granular, so that the copper tailings can be closely stacked, the compactness of RPC is effectively improved, and the mechanical property of the RPC is improved.
(2) The copper tailings contain a large amount of glass bodies and a certain amount of magnetite, and the reaction with the components of the cementing material is more thorough, so that the long-term mechanical property of the copper tailings is ensured.
(3) The active powder concrete is prepared by doping the copper tailing powder, so that the cost of the active powder concrete can be reduced, the problem of land accumulation of the copper tailing can be solved, and the addition of the copper tailing plays a promoting role in improving the strength index of the active powder concrete.
(4) The copper tailing powder active powder concrete disclosed by the invention has considerable compressive strength and flexural strength, can be used for engineering structures such as concrete sound barrier unit plates, highway curb stones and anti-collision walls, and is convenient to construct and low in cost.
Drawings
FIG. 1 is a ball mill for grinding copper tailings.
FIG. 2 is a vibrating screen machine for vibrating and screening fine copper tailings.
FIG. 3 is a mixer in mixing.
FIG. 4 shows a copper tailing reactive powder concrete specimen.
Fig. 5 shows the mold required for pouring the impact wall.
Fig. 6 shows the mold required for pouring the impact wall.
FIG. 7 is a disassembled RPC anti-collision wall member made of copper tailings.
FIG. 8 is a disassembled RPC anti-collision wall member made of copper tailings.
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 copper tailing powder reactive powder concrete comprises the following raw materials in parts by weight: 100-120 parts of cement, 25-35 parts of silica fume, 16-22 parts of steel fiber, 107-135 parts of quartz sand, 50-75 parts of copper tailings, 18-26 parts of water and 1-3 parts of a high-efficiency water reducing agent.
Further, the cement is 42.5 ordinary portland cement.
Further, the steel fiber is a straight steel fiber, the diameter of the straight steel fiber is 200-210 mu m, and the length of the straight steel fiber is 12-14 mm.
Further, the chemical composition content of the silica fume is expressed as follows in percentage: SiO 22：90％-93％、MgO：0.2％-0.4％、C：2％-2.1％、CaO：0.9％-1％、Al2O3：0.7％-0.75％、Fe2O3：0.4％-0.5％、Na2O: 0.1-0.15% and the grain diameter is larger than 1000 meshes.
Further, the quartz sand is SiO2White quartz sand with content higher than 95%.
Further, the chemical composition content of the copper tailing powder is expressed as follows according to percentage: fe: 40% -42% of SiO2：24.3％-24.5％、Ag:32.10％-32.15％、Cu：4.10％-4.20％、Al2O3：1.20％-1.25％、Pb：0.25％-0.30％、CaO：0.65％-0.70％、Na2O：0.10％-0.15％。
Further, the water reducing agent is a Cika high-performance polycarboxylic acid powder water reducing agent, and the water reducing rate is more than or equal to 30%.
A preparation method of copper tailing powder active powder concrete specifically comprises the following steps:
1. and (4) grinding the copper tailings by a ball mill for later use.
2. Wetting the stirrer, and simultaneously uniformly brushing a release agent on the mould (sticking the bottom cavity before smearing to prevent difficult demoulding), and reserving for later use.
3. Adding the prepared copper tailing powder and steel fiber of each particle size fraction into a mixture of cement, silica fume and quartz sand which is mixed for standby in advance, and stirring at a constant speed for 120-180 s.
4. Adding the uniformly stirred water solution of the water reducing agent into the mixed aggregate mixture, stirring at a constant speed for 300-480s, taking out the mixture, immediately measuring the fluidity, and simultaneously filling into a mold and vibrating.
5. And placing the test piece in an environment with the relative humidity of 95% and the temperature condition of 20 ℃, standing for 24h, and then demoulding.
6. And (3) putting the demoulded test piece into a high-temperature steam curing box for high-temperature steam curing for 72 hours, setting the curing temperature to be increased to 85-90 ℃, setting the initial temperature to be 15-20 ℃, and setting the temperature rising and reducing rate to be 15 ℃/h, regularly observing the internal condition of the curing box and draining accumulated water in time.
Further, after the copper tailings in the step 1 are ground, the particle sizes of the copper tailings after being screened by a vibrating screen are divided into three size fractions of 0.6mm-0.3mm, 0.3mm-0.15mm and less than 0.15mm, and the proportion of the copper tailings of the three size fractions is (0.6-1.2): (1.3-2.4): 1.9-2.8).
Further, in the step 3, the particle size of the fine quartz sand is 0.3-0.6mm, the particle size of the medium fine sand is 0.15-0.3mm, the particle size of the extra fine sand is less than 0.15mm, and the proportion of the medium fine sand, the extra fine sand and the extra fine sand is as follows: (2.2-2.7), (1.2-1.5) and (1.6-1.9).
Example 1.
The embodiment of the invention comprises the following components in parts by weight: 50 parts of fine quartz sand with the particle size of 0.6-0.3 mm, 27 parts of medium-fine quartz sand with the particle size of 0.3-0.15 mm, 35 parts of extra-fine quartz sand with the particle size of less than 0.15mm, 18 parts of steel fiber, 100 parts of cement, 25 parts of silica fume, 10 parts of copper tailing powder with the particle size of 0.6-0.3 mm, 23 parts of copper tailing powder with the particle size of 0.3-0.15 mm, 32 parts of copper tailing powder with the particle size of less than 0.15mm, 2 parts of water reducing agent and 24 parts of water.
The specific implementation steps are as follows:
(1) adding the prepared copper tailing powder of each grain size fraction and steel fiber into a mixture of cement, silica fume and quartz sand which is mixed for later use in advance, and stirring for 180s at a constant speed.
(2) And adding the uniformly stirred water reducing agent aqueous solution into the mixed aggregate mixture, stirring at a constant speed for 300s, taking out the mixture, measuring the fluidity of 200mm, and simultaneously filling the mixture into a mold and vibrating.
(3) And placing the test piece in an environment with the relative humidity of 95% and the temperature condition of 20 ℃, standing for 24h, and then demoulding.
(4) And (5) putting the demoulded test piece into a curing box for curing for 3d and taking out.
The compressive strength of example 1 was determined to be: 118 MPa; the breaking strength is: 17 MPa. The compressive strength of the reactive powder concrete without copper tailing powder in the same proportion in comparative example 1 is as follows: 110MPa, and the breaking strength is as follows: 17 MPa.
Example 2.
The embodiment of the invention comprises the following components in parts by weight: 55 parts of fine quartz sand with the particle size of 0.6-0.3 mm, 25 parts of medium-fine quartz sand with the particle size of 0.3-0.15 mm, 35 parts of extra-fine quartz sand with the particle size of less than 0.15mm, 18 parts of steel fiber, 110 parts of cement, 25 parts of silica fume, 15 parts of copper tailing powder with the particle size of 0.6-0.3 mm, 20 parts of copper tailing powder with the particle size of 0.3-0.15 mm, 35 parts of copper tailing powder with the particle size of less than 0.15mm, 3 parts of water reducing agent and 26 parts of water.
The specific implementation steps are as follows:
(1) adding the prepared copper tailing powder of each grain size fraction and steel fiber into a mixture of cement, silica fume and quartz sand which is mixed for later use in advance, and stirring at a constant speed for 120 s.
(2) Adding the uniformly stirred water reducing agent aqueous solution into the mixed aggregate mixture, stirring for 480s at a constant speed, taking out the mixture, measuring the fluidity of the mixture to be 195mm, and simultaneously filling the mixture into a mold and vibrating the mixture.
(3) And placing the test piece in an environment with the relative humidity of 95% and the temperature condition of 20 ℃, standing for 24h, and then demoulding.
(4) And (5) putting the demoulded test piece into a curing box for curing for 3d and taking out.
Example 2 was determined to have a compressive strength of: 122 MPa; the breaking strength is: 21 MPa. The compressive strength of the reactive powder concrete of comparative example 2 without copper tailing powder is as follows: 112MPa, and the breaking strength is as follows: 20 MPa.
Example 3.
The embodiment of the invention comprises the following components in parts by weight: 55 parts of fine quartz sand with the particle size of 0.6-0.3 mm, 28 parts of medium-fine quartz sand with the particle size of 0.3-0.15 mm, 35 parts of extra-fine quartz sand with the particle size of less than 0.15mm, 18 parts of steel fiber, 112 parts of cement, 25 parts of silica fume, 10 parts of copper tailing powder with the particle size of 0.6-0.3 mm, 20 parts of copper tailing powder with the particle size of 0.3-0.15 mm, 40 parts of copper tailing powder with the particle size of less than 0.15mm, 3 parts of water reducing agent and 26 parts of water.
The specific implementation steps are as follows:
(1) adding the prepared copper tailing powder of each grain size fraction and steel fiber into a mixture of cement, silica fume and quartz sand which is mixed for later use in advance, and stirring for 180s at a constant speed.
(2) And adding the uniformly stirred water reducing agent aqueous solution into the mixed aggregate mixture, stirring at a constant speed for 300s, taking out the mixture, measuring the fluidity of the mixture to be 171mm, and simultaneously filling the mixture into a mold and vibrating the mixture.
(3) And placing the test piece in an environment with the relative humidity of 95% and the temperature condition of 20 ℃, standing for 24h, and then demoulding.
(4) And (5) putting the demoulded test piece into a curing box for curing for 3d and taking out.
Example 3 was determined to have a compressive strength of: 125 MPa; the breaking strength is: 21 MPa. The compressive strength of the reactive powder concrete of the comparative example 3 without copper tailing powder in the same proportion is as follows: 120MPa, and the breaking strength is as follows: 20 MPa.
Example 4.
The embodiment of the invention comprises the following components in parts by weight: 55 parts of fine quartz sand with the particle size of 0.6-0.3 mm, 25 parts of medium-fine quartz sand with the particle size of 0.3-0.15 mm, 40 parts of extra-fine quartz sand with the particle size of less than 0.15mm, 18 parts of steel fiber, 115 parts of cement, 25 parts of silica fume, 10 parts of copper tailing powder with the particle size of 0.6-0.3 mm, 30 parts of copper tailing powder with the particle size of 0.3-0.15 mm, 25 parts of copper tailing powder with the particle size of less than 0.15mm, 3 parts of water reducing agent and 24 parts of water.
The specific implementation steps are as follows:
(1) adding the prepared copper tailing powder of each grain size fraction and steel fiber into a mixture of cement, silica fume and quartz sand which is mixed for later use in advance, and stirring at a constant speed for 120 s.
(2) And adding the uniformly stirred water reducing agent aqueous solution into the mixed aggregate mixture, stirring for 480s at a constant speed, taking out the mixture, measuring the fluidity of the mixture to be 192mm, and simultaneously filling the mixture into a mold and vibrating the mixture.
(3) And placing the test piece in an environment with the relative humidity of 95% and the temperature condition of 20 ℃, standing for 24h, and then demoulding.
(4) And (5) putting the demoulded test piece into a curing box for curing for 3d and taking out.
Example 4 was determined to have a compressive strength of: 135 MPa; the breaking strength is: 22 MPa. The compressive strength of the reactive powder concrete without copper tailing powder in the same proportion in the comparative example 4 is as follows: 117MPa, breaking strength: 19 MPa.
The ratio and data index after statistics are shown in tables 1-4 below.
Table 1 examples 1-4 raw material compositions and ratios table.
Table 2 comparison group 1-4 raw material composition and ratio table.
The cementing material in tables 1 and 2 is a mixture of cement and silica fume.
Table 3 examples 1-4 performance index tables.
Table 4 comparative groups 1-4 performance index table.
The results of analyzing the results of the standard reactive powder concrete prepared by using the quartz sand for the copper tailing powder reactive powder concrete prepared by using the copper tailing powder in the above examples 1 to 4 and the control groups 1 to 4 which are not doped with the copper tailing powder, show that the fluidity effect of the reactive powder concrete prepared by doping the copper tailing powder is excellent, and the compressive strength and the flexural strength are both improved, which further proves the excellent mechanical properties and durability of the copper tailing powder reactive powder concrete.
Application example: copper tailings RPC highway anti-collision wall component.
Compared with the performance indexes, the copper tailing reactive powder concrete prepared by taking the more prominent example 4 as the mixture ratio is used as the material of the solid body of the anti-collision wall member, and the anti-collision wall member is poured into an anti-collision wall model for preparation and molding, and the mold is shown in figures 5-6.
The copper tailings RPC anti-collision wall is prepared according to the proportion of example 4, and the components are formed by mixing materials and curing under standard conditions, and the obtained copper tailings RPC anti-collision wall components are shown in figures 7-8.
Ordinary concrete anticollision wall is because of self intensity is lower and perishable, and the surface is easy to ftracture to produce the crack, and RPC anticollision wall is then difficult to appear above problem because of the active material that its used, especially the intensity index is outstanding, causes the cost of this kind of anticollision wall itself higher, and copper tailings RPC not only intensity surpasss the RPC of standard ratio on this basis, and has reduced the cost of manufacture, makes this kind of industrial waste of copper tailings utilized again. And because the activity of the copper tailings is excited, the copper tailings are not easy to crack and corrode, and the copper tailings have obvious advantages in engineering significance and economic benefit.
In conclusion, the active powder concrete is prepared by doping the copper tailing powder as the aggregate in the RPC, so that the prepared highway anti-collision wall member not only plays a role in promoting the economic benefit of preparing the active powder concrete and actively responds to the national policy, but also recycles the industrial waste residue copper tailing to a high value; the copper tailing powder reactive powder concrete has high compressive strength and flexural strength, is simple and convenient in preparation process, is suitable for construction of engineering structures such as concrete sound barrier unit plates, highway kerbs, anti-collision walls and the like, and is convenient to construct and low in cost.
The above exemplary embodiments are selected as representative embodiments of the invention, and example 4 with excellent indexes is prepared as slurry material for road anti-collision walls, and the test results are combined with practical engineering applications, and the specific test cases are not limited to the above 4 embodiments, and the specific application examples are not limited to the above examples. Various modifications, changes, simplifications, and adaptations thereof may be made by those skilled in the art without departing from the spirit and principles of the present invention and are intended to be included within the scope of the present invention.
Claims (10)
1. The copper tailing powder active powder concrete is characterized by comprising the following raw materials in parts by weight: 100-120 parts of cement, 25-35 parts of silica fume, 16-22 parts of steel fiber, 107-135 parts of quartz sand, 50-75 parts of copper tailings, 18-26 parts of water and 1-3 parts of a high-efficiency water reducing agent.
2. The copper tailings powder reactive powder concrete of claim 1, wherein the cement is 42.5 Portland cement.
3. The copper tailings powder reactive powder concrete according to claim 1, wherein the steel fiber is a straight steel fiber, the diameter is 200 to 210 μm, and the length is 12 to 14 mm.
4. The copper tailings powder reactive powder concrete according to claim 1, wherein the chemical component content of the silica fume is expressed by the following percentage: SiO 22 ：90%-93％、MgO：0.2%-0.4％、C：2%-2.1%、CaO：0.9%-1％、Al2O3：0.7%-0.75％、Fe2O3：0.4%-0.5％、Na2O: 0.1-0.15% and the grain diameter is larger than 1000 meshes.
5. The copper tailings powder reactive powder concrete of claim 1, wherein the quartz sand is SiO2White quartz sand with content higher than 95%.
6. The copper tailings powder reactive powder concrete according to claim 1, wherein the copper tailings powder comprises the following chemical components in percentage by weight: fe: 40% -42% of SiO2：24.3%-24.5％、Ag:32.10%-32.15%、Cu：4.10%-4.20％、Al2O3：1.20%-1.25％、Pb：0.25%-0.30％、CaO：0.65%-0.70％、Na2O：0.10%-0.15％。
7. The copper tailings powder active powder concrete of claim 1, wherein the water reducing agent is a high-performance polycarboxylic acid powder water reducing agent with a water reducing rate of not less than 30%.
8. The preparation method of the copper tailing powder active powder concrete is characterized by comprising the following steps:
step 1, grinding copper tailings by a ball mill for later use;
step 2, wetting the stirrer, and simultaneously uniformly brushing a release agent on the mould (adhering a bottom cavity before smearing to prevent difficult demoulding) for later use;
step 3, adding prepared copper tailing powder and steel fiber of each particle size fraction into a mixture of cement, silica fume and quartz sand which is mixed for standby in advance, and stirring at a constant speed for 120-180 seconds;
step 4, adding the uniformly stirred water solution of the water reducing agent into the mixed aggregate mixture, stirring for 300-480s at a constant speed, taking out the mixture, immediately measuring the fluidity, and simultaneously filling the mixture into a mold and vibrating the mixture;
step 5, placing the test piece in an environment with the relative humidity of 95% and the temperature condition of 20 ℃, standing for 24 hours, and then demolding;
and 6, putting the demoulded test piece into a high-temperature steam curing box for high-temperature steam curing for 72 hours, setting the curing temperature to be increased to 85-90 ℃, setting the initial temperature to be 15-20 ℃, setting the temperature increasing and reducing rate to be 15 ℃/h, regularly observing the internal condition of the curing box, and draining accumulated water in time.
9. The method for preparing the copper tailing powder reactive powder concrete according to claim 8, wherein after the copper tailings in the step 1 are ground, the particle size of the ground copper tailings after being screened by a vibrating screen is divided into three particle sizes of 0.6mm-0.3mm, 0.3mm-0.15mm and less than 0.15mm, and the proportion of the copper tailings of the three particle sizes is (0.6-1.2): (1.3-2.4): (1.9-2.8).
10. The method for preparing copper tailing powder reactive powder concrete according to claim 8, wherein in the step 3, the particle size of quartz sand fine sand is 0.3-0.6mm, the particle size of medium fine sand is 0.15-0.3mm, the particle size of extra fine sand is less than 0.15mm, and the proportion of medium fine sand, fine sand and extra fine sand is as follows: (2.2-2.7), (1.2-1.5) and (1.6-1.9).
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