CN113213847A - Copper tailing based ultra-high performance concrete and preparation method thereof - Google Patents
Copper tailing based ultra-high performance concrete and preparation method thereof Download PDFInfo
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- CN113213847A CN113213847A CN202110556397.2A CN202110556397A CN113213847A CN 113213847 A CN113213847 A CN 113213847A CN 202110556397 A CN202110556397 A CN 202110556397A CN 113213847 A CN113213847 A CN 113213847A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 79
- 239000010949 copper Substances 0.000 title claims abstract description 79
- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000002002 slurry Substances 0.000 claims abstract description 26
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000004567 concrete Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 13
- 239000011398 Portland cement Substances 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 24
- 238000000498 ball milling Methods 0.000 claims description 13
- 239000006004 Quartz sand Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- 239000008030 superplasticizer Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims 1
- 239000004568 cement Substances 0.000 description 12
- 230000036571 hydration Effects 0.000 description 8
- 238000006703 hydration reaction Methods 0.000 description 8
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000002910 solid waste Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013074 reference sample Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 239000011882 ultra-fine particle 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
- 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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides copper tailing based ultra-high performance concrete and a preparation method thereof, wherein the copper tailing based ultra-high performance concrete comprises the following raw materials of a cementing material and an aggregate, and the mass ratio of the cementing material to the aggregate is 1.1: 1, the cementing material comprises the following raw material components in percentage by mass: P.O 52.5.5 parts of Portland cement, 0-15 parts of silica fume, 5-20 parts of copper tailing slurry, 2.5-3.8 parts of polycarboxylic acid water reducing agent and the balance of water. According to the invention, the copper tailings are used as raw materials to prepare the ultrahigh-performance concrete with high working performance, the concrete has the characteristics of high working performance, high compressive strength and the like, the fluidity reaches 260-285 mm, the 28d compressive strength reaches 121.6-129.4 MPa, and the invention provides a good solution for resource utilization of the copper tailings.
Description
Technical Field
The invention belongs to the technical field of mortar, concrete or similar building materials, and relates to copper tailing based ultra-high performance concrete and a preparation method thereof.
Background
Copper tailings, also called copper tailings, are powdery or gravel-like solid wastes left after natural copper ores are subjected to mineral separation operations such as crushing, sorting and concentration. The tailings are mostly stored in a manner of filling a depression or building a dam for stacking, except a small amount of the tailings serving as fillers of old mines. The continuous accumulation of the copper tailings not only occupies a large amount of land resources and affects the local natural ecology and human landscape, but also easily causes pollution to soil, water, air and the like, and simultaneously can induce natural disasters such as mountain collapse, landslide, debris flow and the like. The copper tailings are both bulk solid wastes and potential secondary resources, so the method has great development potential for secondary resource utilization and harmless treatment of the copper tailings. However, the copper tailings are extremely poor in dispersibility and are easy to agglomerate, so that the application of the copper tailings in the field of building materials is severely limited.
Ultra-high performance concrete (UHPC) is a novel cement-based composite material with ultra-high mechanical properties (>120MPa), durability and working performance, and is formed by a particle close-packed structure. UHPC, prepared on the basis of solid waste, is considered to be a promising setting material, because of its low water-to-gel ratio and the large amount of unhydrated cement that can only be used as an expensive filler.
The invention provides a novel resource utilization scheme of copper tailings, namely, the copper tailings are prepared into slurry to partially replace cement or silica fume in UHPC (ultra high performance concrete), and the copper tailings based ultra-high performance concrete is prepared. The copper tailings applied to the UHPC can open up a new green cement-based material path, improve the utilization rate of the copper tailings, is beneficial to economy, environment and urban construction, and realizes the sustainable development of economy, resources and environment in copper mine areas.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides copper tailing based ultra-high performance concrete prepared by using copper tailings as a raw material and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the copper tailing based ultra-high performance concrete comprises the following raw materials of a cementing material and aggregate, wherein the mass ratio of the cementing material to the aggregate is 1.1: 1, the cementing material comprises the following raw material components in percentage by mass: P.O 52.5.5% of Portland cement, 50-65% of silica fume, 0-15% of copper tailings, 5-20% of copper tailings slurry, 2.5-3.8% of polycarboxylic acid water reducing agent and the balance of water;
the copper tailing slurry is prepared by taking copper tailings as a raw material, the D50 median diameter of solid particles in the slurry is 4-6 mu m, and the slurry does not bleed or segregate within 24 hours, and the preparation method specifically comprises the following steps: and adding the copper tailings, the polycarboxylic acid water reducing agent and water into a ball milling tank, and carrying out ball milling by taking agate balls as ball milling media to obtain copper tailing slurry. And the polycarboxylic acid water reducing agent is added to be ball-milled with the copper tailings, so that the dispersion effect of the copper tailings can be improved. When no polycarboxylic acid water reducing agent is added, the copper tailings can be agglomerated into blocks after being ground, and the dispersibility is extremely poor.
According to the scheme, the mass ratio of the copper tailings, the agate balls, the polycarboxylic acid water reducing agent and the water is 1: 0.2-0.3: 0.04-0.06: 0.15 to 0.25.
According to the scheme, the diameters of the agate balls are respectively 20mm, 10mm and 5mm, and the mass ratio of the agate balls is 1: 2: 1.
according to the scheme, the ball milling process conditions are as follows: ball milling was carried out at a rate of 120rpm for 10 minutes.
According to the scheme, the solid content of the polycarboxylate superplasticizer is 40%, and the water reducing rate is 30-35%.
According to the scheme, the aggregate comprises the following components in percentage by mass:
80-120 meshes of 20-25% of quartz sand,
40-80 meshes and 55-60% of quartz sand,
quartz sand 0.5-1.0 mm 15-25%.
The invention also comprises a preparation method of the copper tailing based ultra-high performance concrete, which comprises the following specific steps:
1) weighing raw materials of the cementing material and the aggregate according to a proportion for later use;
2) P.O 52.5.5 Portland cement, silica fume and copper tailing slurry are mixed uniformly, the uniformly mixed aggregate is added, water and a polycarboxylic acid water reducing agent are added after uniform stirring, and the copper tailing based ultrahigh-performance concrete is obtained after uniform stirring and curing forming.
According to the scheme, the curing and forming conditions in the step 2) are as follows: curing for 1 day under standard curing conditions (temperature 20 + -1 deg.C, humidity > 90%), demolding, and curing for 28 days.
Because a large amount of unhydrated cement or unreacted silica fume exists in the UHPC, the copper tailing slurry is used for partially replacing the cement or silica fume in the UHPC, so that the influence on the generation of hydration products is small, and further the influence on the strength development is small; and because the gap type particle size distribution exists among the cement, the copper tailings and the silica fume, the cement mortar can form a compact and stacked structure and is favorable for the strength of UHPC.
The invention has the beneficial effects that: 1. according to the invention, copper tailings are used as raw materials to prepare the ultrahigh-performance concrete, the concrete has the characteristics of good working performance, high compressive strength and the like, the fluidity reaches 260-285 mm, and the 28d compressive strength reaches 121.6-129.4 MPa; 2. the preparation method disclosed by the invention is simple in process, and the solid waste copper tailings are used for partially replacing unhydrated cement and silica fume in UHPC (ultra high performance concrete), so that the production cost can be saved, the high performance of the UHPC can be maintained, the method can be taken as an effective means for improving the additional value of the copper tailings, and the method has a very good popularization prospect in the aspect of resource utilization of the copper tailings.
Drawings
Fig. 1 is a hydration heat peak preventing chart of the concrete prepared in examples 1 and 7 of the present invention and the reference concrete.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention is further described in detail with reference to the following examples.
The solid content of the polycarboxylate superplasticizer used in the embodiment of the invention is 40%, and the water reducing rate is 30%.
The median particle sizes of the P.O 52.5.5 portland cement, silica fume, and copper tailings used in the examples of the invention are shown in table 1.
TABLE 1 median particle diameter of raw materials
| Raw material | Median particle diameter (μm) |
| P.O 52.5.5 Portland cement | 13.5 |
| Silica fume | 1.2 |
| Copper tailings | 9.4 |
In the embodiment of the invention, the test of the fluidity of the mortar refers to the specification GB/T2419-; the 28d mortar compressive strength test is referred to specification GB/T17671-1999.
Examples 1 to 7
The preparation method of the copper tailing based ultra-high performance concrete comprises the following specific steps:
weighing raw materials of the cementing material and the aggregate according to a proportion for later use;
uniformly mixing aggregate sand I (quartz sand of 80-120 meshes), sand II (quartz sand of 40-80 meshes) and sand III (quartz sand of 0.5-1.0 mm);
P.O 52.5.5 Portland cement, silica fume and copper tailing slurry are mixed, slowly stirred for 1min, the uniformly mixed aggregate is added, slowly stirred for 1min, water and a water reducing agent are added, slowly stirred for 5min and quickly stirred for 2min, the mixture is maintained for 1 day under standard maintenance conditions (the temperature is 20 +/-1 ℃ and the humidity is more than 90 percent), then demoulded, and the copper tailing based ultrahigh-performance concrete is obtained after continuous maintenance for 28 days.
The preparation method of the copper tailing slurry comprises the following steps: adding copper tailings, a polycarboxylic acid water reducing agent and water into a ball milling tank, taking agate balls as ball milling media (the diameters of the agate balls with three specifications are 20mm, 10mm and 5mm respectively, and the mass ratio is 1: 2: 1), wherein the mass ratio of the copper tailings, the agate balls, the polycarboxylic acid water reducing agent and the water is 1: 0.2-0.3: 0.04-0.06: 0.15-0.25, and performing ball milling for 10 minutes at the speed of 120rpm to obtain copper tailing slurry. Through tests, the copper tailing slurry prepared by the embodiment of the invention does not bleed and segregate within 24 hours.
The types of the copper tailing slurries used in examples 1 to 7 are shown in table 1, the sand ratios are shown in table 2, and the concrete ratios (the reference sample is UHPC concrete obtained by not replacing a part of cement and silica fume with the copper tailing slurry, the concrete prepared in examples 1 to 7 is marked as S1 to S7, and the reference sample is marked as D1) and the performance evaluations are shown in table 3.
TABLE 2 copper tailings slurry species
TABLE 3 Sand ratio
Table 3 example formulation and performance evaluation
As can be seen from the performance evaluation data of the examples in Table 3, the fluidity of the ultra-high performance concrete mortar prepared by using the copper tailings in the examples of the invention reaches 260-285 mm, the 28D compressive strength reaches 121.6-129.4 MPa, and compared with the UHPC concrete prepared by using D1, the fluidity of the ultra-high performance concrete mortar is improved, and the 28 compressive strength is slightly reduced, but the difference is small.
As shown in fig. 1, the hydration heat release peaks of the concretes S1, S7 and D1 are shown, and it can be seen from the figure that, compared with D1, when the copper tailing slurry is used to partially replace cement or silica fume, the hydration heat release peak of the concrete system is obviously reduced compared with D1, because the amount of cement or silica fume is reduced due to the dilution effect of the copper tailing slurry, so that the cement or silica fume participating in hydration is reduced, the amount of generated hydration products is reduced, the hydration heat release peak of the concrete system is reduced, internal thermal damage caused by heat release can be reduced, and a certain inhibiting effect on expansion cracking of the concrete is achieved; in addition, the hydration exotherm of the system was slightly advanced after the addition of the copper tailings slurry, probably due to the nucleation induction of the ultra-fine particles in the copper tailings slurry.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The copper tailing based ultra-high performance concrete is characterized in that raw materials of the concrete are gelled materials and aggregates, and the mass ratio of the gelled materials to the aggregates is 1.1: 1, the cementing material comprises the following raw material components in percentage by mass: P.O 52.5.5% of Portland cement, 50-65% of silica fume, 0-15% of copper tailings, 5-20% of copper tailings slurry, 2.5-3.8% of polycarboxylic acid water reducing agent and the balance of water;
the copper tailing slurry is prepared by taking copper tailings as a raw material, the D50 median diameter of solid particles in the slurry is 4-6 mu m, and the slurry does not bleed or segregate within 24 hours, and the preparation method specifically comprises the following steps: and adding the copper tailings, the polycarboxylic acid water reducing agent and water into a ball milling tank, and carrying out ball milling by taking agate balls as ball milling media to obtain copper tailing slurry.
2. The copper tailing based ultra-high performance concrete according to claim 1, wherein the mass ratio of the copper tailings, the agate balls, the polycarboxylic acid water reducing agent and the water is 1: 0.2-0.3: 0.04-0.06: 0.15 to 0.25.
3. The copper tailing based ultra-high performance concrete as claimed in claim 1, wherein the diameters of the agate balls are 20mm, 10mm and 5mm respectively, and the mass ratio is 1: 2: 1.
4. the copper tailing based ultra-high performance concrete according to claim 1, wherein the ball milling process conditions are as follows: ball milling was carried out at a rate of 120rpm for 10 minutes.
5. The copper tailing based ultra-high performance concrete as claimed in claim 1, wherein the solid content of the polycarboxylate superplasticizer is 40%, and the water reducing rate is 30-35%.
6. The copper tailing based ultra-high performance concrete according to claim 1, characterized in that the components and mass percentages of the aggregate are as follows:
80-120 meshes of 20-25% of quartz sand,
40-80 meshes and 55-60% of quartz sand,
quartz sand 0.5-1.0 mm 15-25%.
7. The preparation method of the copper tailing based ultra-high performance concrete as claimed in any one of claims 1 to 6, which is characterized by comprising the following specific steps:
1) weighing raw materials of the cementing material and the aggregate according to a proportion for later use;
2) P.O 52.5.5 Portland cement, silica fume and copper tailing slurry are mixed uniformly, the uniformly mixed aggregate is added, water and a polycarboxylic acid water reducing agent are added after uniform stirring, and the copper tailing based ultrahigh-performance concrete is obtained after uniform stirring and curing forming.
8. The method for preparing the copper tailing based ultra-high performance concrete according to claim 7, wherein the curing and molding conditions in the step 2) are as follows: and (5) curing for 1 day under standard curing conditions, demolding, and continuing curing for 28 days.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113831083A (en) * | 2021-09-30 | 2021-12-24 | 中铁桥研科技有限公司 | Ecological type ultra-high performance concrete and preparation method thereof |
| CN113860814A (en) * | 2021-09-18 | 2021-12-31 | 沈阳工业大学 | Copper tailing powder active powder concrete and preparation method thereof |
| CN114956722A (en) * | 2022-05-06 | 2022-08-30 | 安徽理工大学 | Ultra-high-strength concrete prepared from superfine copper tailings |
| CN114956699A (en) * | 2022-04-22 | 2022-08-30 | 安徽理工大学 | Low-shrinkage concrete material prepared from copper tailings and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860814A (en) * | 2021-09-18 | 2021-12-31 | 沈阳工业大学 | Copper tailing powder active powder concrete and preparation method thereof |
| CN113831083A (en) * | 2021-09-30 | 2021-12-24 | 中铁桥研科技有限公司 | Ecological type ultra-high performance concrete and preparation method thereof |
| CN114956699A (en) * | 2022-04-22 | 2022-08-30 | 安徽理工大学 | Low-shrinkage concrete material prepared from copper tailings and preparation method thereof |
| CN114956722A (en) * | 2022-05-06 | 2022-08-30 | 安徽理工大学 | Ultra-high-strength concrete prepared from superfine copper tailings |
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