CN114671651A - Full-solid-waste ultra-high-performance concrete mortar and preparation method thereof - Google Patents
Full-solid-waste ultra-high-performance concrete mortar and preparation method thereof Download PDFInfo
- Publication number
- CN114671651A CN114671651A CN202111515367.3A CN202111515367A CN114671651A CN 114671651 A CN114671651 A CN 114671651A CN 202111515367 A CN202111515367 A CN 202111515367A CN 114671651 A CN114671651 A CN 114671651A
- Authority
- CN
- China
- Prior art keywords
- parts
- concrete mortar
- performance concrete
- iron tailings
- stirring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 81
- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 55
- 239000002910 solid waste Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 118
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910052742 iron Inorganic materials 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000004576 sand Substances 0.000 claims abstract description 32
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 26
- 239000010949 copper Substances 0.000 claims abstract description 26
- 239000002893 slag Substances 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims description 47
- 239000000203 mixture Substances 0.000 claims description 39
- 239000003638 chemical reducing agent Substances 0.000 claims description 22
- 239000004568 cement Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 17
- 229910021487 silica fume Inorganic materials 0.000 claims description 17
- 238000009775 high-speed stirring Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000004567 concrete Substances 0.000 abstract description 35
- 239000006004 Quartz sand Substances 0.000 abstract description 26
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 239000010453 quartz Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 14
- 239000011148 porous material Substances 0.000 description 12
- 239000002253 acid Substances 0.000 description 5
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
-
- 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
-
- 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 belongs to the technical field of concrete, and provides full-solid-waste ultrahigh-performance concrete mortar. The iron tailings, the machine-made sand and the copper slag are used for replacing quartz sand to prepare the concrete mortar, the main component of the iron tailings is quartz, the iron tailings has high hardness and can be used as aggregate to be doped into the concrete mortar to ensure the strength of the concrete mortar, the use of the machine-made sand can improve the compression strength and the flexural strength of the concrete mortar and limit the volume deformation of the mortar, the use of the copper slag can greatly improve the fluidity of the concrete mortar, the water consumption rate is reduced, and the fluidity and the strength of the concrete mortar are ensured while the quartz sand is replaced by the total solid wastes. The results of the examples show that the fluidity of the all-solid-waste ultrahigh-performance concrete mortar provided by the invention is 180mm, the 28d compressive strength is 115.03MPa, and the 28d flexural strength is 19.9 MPa.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to full-solid waste ultra-high performance concrete mortar and a preparation method thereof.
Background
The natural quartz sand is usually adopted as aggregate in the ultrahigh-performance concrete, and the natural sand is a local resource, is not beneficial to long-distance transportation and cannot be regenerated in a short period. With the increasing development of infrastructure construction in China, natural sand resources in many areas in China are gradually in short supply, even no sand is available, and the contradiction between supply and demand of concrete sand is particularly prominent. In addition, due to the disordered production of the natural sand, air and environment pollution is caused during the production, storage and transportation processes.
The total development scale of mineral resources in China is at the forefront of the world, and iron ore resources have the characteristics of low grade and more symbiotic associated ores, so that a large amount of iron tailings are generated in the ore dressing process, 2.5-3 t of tailings are discharged when 1t of iron ore concentrate is produced, but due to ore depletion, the ore dressing ratio of some mine enterprises reaches 5-6, even reaches more than 10. However, the comprehensive utilization rate of the tailings is 14 percent at present, and the utilization rate of the iron tailings is only about 7 percent.
Although the prior art also reports about the preparation of concrete by using iron tailings instead of part of quartz sand, the incorporation of iron tailings can cause other problems, such as high water absorption due to multiple edges and corners on the surface of iron tailings, excessive viscosity of the whole slurry, which affects the fluidity of concrete, and difficulty in compacting by vibration, which cannot achieve the strength equivalent to that of quartz sand concrete.
Disclosure of Invention
The invention provides full-solid waste ultrahigh-performance concrete mortar and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
The invention provides a full-solid waste ultra-high performance concrete mortar, which comprises the following components in parts by weight: 920-930 parts of iron tailings, 195-205 parts of machine-made sand, 195-205 parts of copper slag, 700-705 parts of cement, 175-180 parts of silica fume, 162-165 parts of water and 18-22 parts of a water reducing agent.
Preferably, the total-solid-waste ultrahigh-performance concrete mortar comprises the following components in parts by weight: 924-928 parts of iron tailings, 200-205 parts of machine-made sand, 200-205 parts of copper slag, 700-702 parts of cement, 176-178 parts of silica fume, 164-165 parts of water and 20-22 parts of a water reducing agent.
Preferably, the iron tailings are graded as follows: 215-225 parts of iron tailings with the particle size of less than 0.075mm, 335-340 parts of iron tailings with the particle size of 0.075-0.15 mm, and 360-365 parts of iron tailings with the particle size of 0.15-0.30 mm.
Preferably, the grain size of the machine-made sand is 0.3-0.6 mm.
Preferably, the particle size of the copper slag is 0.6-1.25 mm.
The invention also provides a preparation method of the full-solid waste ultra-high performance concrete mortar, which comprises the following steps:
(1) mixing iron tailings, machine-made sand and copper slag, and stirring to obtain a mixture A;
(2) mixing the mixture A obtained in the step (1) with cement and silica fume, and then stirring to obtain a mixture B;
(3) Mixing the mixture B obtained in the step (2) with part of water and a water reducing agent, and then stirring to obtain a mixture C;
(4) and (4) mixing the mixture C obtained in the step (3) with the rest of water, stirring, and curing to obtain the full-solid waste ultra-high performance concrete mortar.
Preferably, the stirring speed in the step (1), the step (2) and the step (3) is independently rotation 140 +/-5 r/min and revolution 62 +/-5 r/min; the stirring time in the step (1) and the step (2) is independently 1-1.5 min, and the stirring time in the step (3) is 2-2.5 min.
Preferably, the stirring in the step (4) includes low-speed stirring and high-speed stirring.
Preferably, the low-speed stirring speed is 140 +/-5 r/min of rotation and 62 +/-5 r/min of revolution, and the low-speed stirring time is 1-2 min; the high-speed stirring speed is 285 +/-10 r/min of rotation and 125 +/-10 r/min of revolution, and the high-speed stirring time is 1-2 min.
Preferably, the curing temperature in the step (4) is 60-65 ℃, and the curing time is 3-5 days.
The invention provides a full-solid waste ultra-high performance concrete mortar, which comprises the following components in parts by weight: 920-930 parts of iron tailings, 195-205 parts of machine-made sand, 195-205 parts of copper slag, 700-705 parts of cement, 175-180 parts of silica fume, 162-165 parts of water and 18-22 parts of a water reducing agent. The iron tailings, the machine-made sand and the copper slag are used for replacing quartz sand to prepare the concrete mortar, the main component of the iron tailings is quartz, the iron tailings has high hardness and can be used as aggregate to be doped into the concrete mortar to ensure the strength of the concrete mortar, the use of the machine-made sand can improve the compression strength and the flexural strength of the concrete mortar and limit the volume deformation of the mortar, the use of the copper slag can greatly improve the fluidity of the concrete mortar, the water consumption rate is reduced, and the fluidity and the strength of the concrete mortar are ensured while the quartz sand is replaced by the total solid wastes. The results of the examples show that the fluidity of the all-solid-waste ultrahigh-performance concrete mortar provided by the invention is 180mm, the 28d compressive strength is 115.03MPa, and the 28d flexural strength is 19.9 MPa.
Drawings
FIG. 1 is a photograph of an extended surface of a full solid waste ultra-high performance concrete mortar prepared in example 1 of the present invention;
FIG. 2 is a photograph of an extended surface of the quartz sand ultra-high performance concrete mortar prepared in comparative example 1;
FIG. 3 is a graph showing cumulative pore volumes of ultra-high performance concrete mortars prepared in example 1 of the present invention and comparative example 1;
FIG. 4 is a pore distribution diagram of the ultra high performance concrete mortars prepared in example 1 of the present invention and comparative example 1.
Detailed Description
The invention provides a full-solid waste ultra-high performance concrete mortar, which comprises the following components in parts by weight: 920-930 parts of iron tailings, 195-205 parts of machine-made sand, 195-205 parts of copper slag, 700-705 parts of cement, 175-180 parts of silica fume, 162-165 parts of water and 18-22 parts of a water reducing agent.
The total-solid-waste ultrahigh-performance concrete mortar provided by the invention comprises 920-930 parts of iron tailings, and preferably 924-928 parts. In the invention, the main component of the iron tailings is quartz, has strong hardness, and can be used as aggregate to be doped into concrete mortar to ensure the strength of the concrete mortar. The source of the iron tailings is not particularly limited in the invention, and the iron tailings well known to those skilled in the art can be used.
In the invention, the grading of the iron tailings is preferably as follows: 215-225 parts of iron tailings with the particle size of less than 0.075mm, 335-340 parts of iron tailings with the particle size of 0.075-0.15 mm, and 360-365 parts of iron tailings with the particle size of 0.15-0.30 mm. The grading of the iron tailings is preferably controlled within the range, the iron tailings with the particle size of less than 0.075mm play a role in filling fine micropores in the concrete mortar, and the iron tailings with the particle size of 0.075-0.3 mm play a role in supporting the strength in the concrete mortar.
According to the weight part of the iron tailings being 920-930 parts, the total-solid-waste ultrahigh-performance concrete mortar provided by the invention comprises 195-205 parts of machine-made sand, and preferably 200-205 parts. In the invention, the addition of the machine-made sand can improve the compression strength and the flexural strength of the concrete mortar and limit the volume deformation of the mortar.
In the invention, the grain size of the machine-made sand is preferably 0.3-0.6 mm. The invention preferably controls the particle size of the machine-made sand within the range, the solid waste of the 0.3-0.6 mm particle size section is rare, and the machine-made sand can fill the particle size of the section. The invention preferably adopts iron tailing waste rocks to be crushed into machine-made sand.
According to the weight part of the iron tailings of 920-930 parts, the total-solid-waste ultrahigh-performance concrete mortar provided by the invention comprises 195-205 parts of copper slag, and preferably 200-205 parts. The copper slag is added, so that the overall fluidity of the concrete mortar can be increased. The ultra-high performance concrete is characterized by extremely low water-cement ratio, extremely low water consumption and low fluidity, and under the condition, the concrete cannot be compacted to discharge air bubbles to influence the strength of the concrete. The traditional means for solving the fluidity of the ultrahigh-performance concrete is generally to add a high-efficiency water reducing agent, but the high-efficiency water reducing agent usually has a water reducing saturation point, the improvement on the fluidity is very little after the water reducing agent reaches the saturation point, and the cost of adding a large amount of water reducing agent is increased.
In the invention, the particle size of the copper slag is preferably 0.6-1.25 mm. According to the invention, the copper slag with the thickness of 0.6-1.25 mm is preferably adopted to replace quartz sand, and the copper slag as the fine aggregate can greatly improve the fluidity of the concrete mortar and reduce the water consumption rate.
According to the weight part of the iron tailings of 920-930 parts, the total-solid-waste ultrahigh-performance concrete mortar provided by the invention comprises 700-705 parts of cement, preferably 700-702 parts. In the present invention, the cement acts as a cementitious material. The source of the cement is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In the present invention, the cement is preferably 52.5 cement.
According to the weight part of the iron tailings being 920-930 parts, the total-solid-waste ultrahigh-performance concrete mortar provided by the invention comprises 175-180 parts of silica fume, preferably 176-178 parts. In the present invention, the silica fume acts as a gelling material. The source of the silica fume is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used.
According to the weight part of the iron tailings being 920-930 parts, the total-solid-waste ultrahigh-performance concrete mortar provided by the invention comprises 162-165 parts of water, and preferably 164-165 parts. In the present invention, the water is used to mix other components.
According to the weight part of the iron tailings being 920-930 parts, the total-solid-waste ultrahigh-performance concrete mortar provided by the invention comprises 18-22 parts of water reducing agent, preferably 20-22 parts. In the invention, the water reducing agent is preferably a polycarboxylic acid high-efficiency water reducing agent. The source of the water reducing agent is not particularly limited in the present invention, and a commercially available product well known to those skilled in the art may be used.
The invention utilizes the iron tailings, the machine-made sand and the copper slag to replace quartz sand to prepare the full-solid waste ultrahigh-performance concrete mortar, the main component of the iron tailings is quartz, the iron tailings has very strong hardness and can be doped into the concrete mortar as aggregate, the use of the machine-made sand can improve the compression strength and the flexural strength of the concrete mortar and limit the volume deformation of the mortar, the use of the copper slag can greatly improve the fluidity of the concrete mortar, reduce the water consumption rate, realize that the full-solid waste replaces the quartz sand and ensure the fluidity and the strength of the concrete mortar.
The invention also provides a preparation method of the full-solid waste ultra-high performance concrete mortar, which comprises the following steps:
(1) mixing iron tailings, machine-made sand and copper slag, and stirring to obtain a mixture A;
(2) mixing the mixture A obtained in the step (1) with cement and silica fume, and then stirring to obtain a mixture B;
(3) Mixing the mixture B obtained in the step (2) with part of water and a water reducing agent, and then stirring to obtain a mixture C;
(4) and (4) mixing the mixture C obtained in the step (3) with the rest part of water, stirring, and curing to obtain the full-solid waste ultra-high performance concrete mortar.
The method mixes and stirs the iron tailings, the machine-made sand and the copper slag to obtain a mixture A.
In the invention, the stirring speed is preferably 140 +/-5 r/min of rotation and 62 +/-5 r/min of revolution; more preferably, the rotation is 140 +/-3 r/min and the revolution is 62 +/-3 r/min; the stirring time is preferably 1-1.5 min, and more preferably 1 min.
After the mixture A is obtained, the mixture A is mixed with cement and silica fume and then stirred to obtain a mixture B.
In the invention, the stirring speed is preferably 140 +/-5 r/min of rotation and 62 +/-5 r/min of revolution; more preferably, the rotation is 140 +/-3 r/min and the revolution is 62 +/-3 r/min; the stirring time is preferably 1-1.5 min, and more preferably 1 min.
After the mixture B is obtained, the mixture B is mixed with part of water and a water reducing agent and then stirred to obtain a mixture C.
In the present invention, the portion of water is preferably 50% of the total weight part of water. In the invention, the stirring speed is preferably 140 +/-5 r/min of rotation and 62 +/-5 r/min of revolution; more preferably, the rotation is 140 +/-3 r/min and the revolution is 62 +/-3 r/min; the stirring time is preferably 2-2.5 min, and more preferably 2 min.
And after the mixture C is obtained, mixing the mixture C with the rest part of water, stirring, and curing to obtain the full-solid waste ultra-high performance concrete mortar.
In the present invention, the stirring preferably includes low-speed stirring and high-speed stirring. In the invention, the low-speed stirring speed is preferably 140 +/-5 r/min of rotation and 62 +/-5 r/min of revolution, more preferably 140 +/-3 r/min of rotation and 62 +/-3 r/min of revolution; the time of the low-speed stirring is preferably 1-2 min, and more preferably 1 min. In the invention, the high-speed stirring speed is preferably 285 +/-10 r/min of rotation and 125 +/-10 r/min of revolution, more preferably 285 +/-5 r/min of rotation and 125 +/-5 r/min of revolution; the high-speed stirring time is preferably 1-2 min, and more preferably 2 min.
In the invention, the curing temperature is preferably 60-65 ℃, and more preferably 63-65 ℃; the curing time is preferably 3 to 5 days, and more preferably 5 days.
The preparation method provided by the invention is simple to operate, realizes the full mixing of the raw materials, and ensures the performance of the concrete mortar.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The full-solid waste ultra-high performance concrete mortar comprises the following components in parts by weight: 224 parts of iron tailings with the diameter less than 0.075mm, 336 parts of iron tailings with the diameter of 0.075-0.15 mm, 364 parts of iron tailings with the diameter of 0.15-0.30 mm, 200 parts of machine-made sand with the diameter of 0.3-0.6 mm, 200 parts of copper slag with the diameter of 0.6-1.25 mm, 700 parts of 52.5 cement, 176 parts of silica fume, 164 parts of water and 18 parts of polycarboxylic acid high-efficiency water reducing agent.
The preparation method comprises the following steps:
(1) adding 224 parts by weight of iron tailings with the diameter less than 0.075mm, 336 parts by weight of iron tailings with the diameter of 0.075-0.15 mm, 364 parts by weight of iron tailings with the diameter of 0.15-0.30 mm, 200 parts by weight of machine-made sand with the diameter of 0.3-0.6 mm and 200 parts by weight of copper slag with the diameter of 0.6-1.25 mm into a stirrer, and stirring for 1min at the speed of rotation 143r/min and revolution 65r/min to obtain a mixture A;
(2) mixing the mixture A obtained in the step (1) with 700 parts by weight of 52.5 cement and 176 parts by weight of silica fume, and then continuing to stir for 1min at the speed of rotation 143r/min and revolution 65r/min to obtain a mixture B;
(3) mixing the mixture B obtained in the step (2) with 82 parts by weight of water and 18 parts by weight of polycarboxylic acid high efficiency water reducing agent, and then continuing stirring for 2min at the speed of rotation 143r/min and revolution 65r/min to obtain a mixture C;
(4) and (4) mixing the mixture C obtained in the step (3) with the residual 82 parts by weight of water, continuing to stir for 1min at the speed of rotation 143r/min and revolution 65r/min, and then stirring for 2min at the speed of rotation 290r/min and revolution 130r/min to obtain the full-solid-waste ultrahigh-performance concrete mortar.
Comparative example 1
The quartz sand ultra-high performance concrete mortar comprises the following components in parts by weight: 224 parts of quartz sand with the thickness less than 0.075mm, 336 parts of quartz sand with the thickness of 0.075-0.15 mm, 364 parts of quartz sand with the thickness of 0.15-0.30 mm, 200 parts of quartz sand with the thickness of 0.3-0.6 mm, 200 parts of quartz sand with the thickness of 0.6-1.25 mm, 700 parts of 52.5 cement, 176 parts of silica fume, 164 parts of water and 18 parts of polycarboxylic acid high-efficiency water reducing agent.
The preparation method comprises the following steps:
(1) 224 parts of quartz sand with the thickness less than 0.075mm, 336 parts of quartz sand with the thickness of 0.075-0.15 mm, 364 parts of quartz sand with the thickness of 0.15-0.30 mm, 200 parts of quartz sand with the thickness of 0.3-0.6 mm and 200 parts of quartz sand with the thickness of 0.6-1.25 mm are added into a stirrer and stirred for 1min according to the rotation speed of 143r/min and the revolution speed of 65r/min to obtain a mixture A;
(2) mixing the mixture A obtained in the step (1) with 700 parts by weight of 52.5 cement and 176 parts by weight of silica fume, and then continuously stirring for 1min at the speed of rotation 143r/min and revolution 65r/min to obtain a mixture B;
(3) mixing the mixture B obtained in the step (2) with 82 parts by weight of water and 18 parts by weight of polycarboxylic acid high efficiency water reducing agent, and then continuing stirring for 2min at the speed of rotation 143r/min and revolution 65r/min to obtain a mixture C;
(4) and (4) mixing the mixture C obtained in the step (3) with the residual 82 parts by weight of water, continuing to stir for 1min at the speed of rotation 143r/min and revolution 65r/min, and then stirring for 2min at the speed of rotation 290r/min and revolution 130r/min to obtain the quartz sand ultrahigh-performance concrete mortar.
Fig. 1 is a photograph of an extended surface of the all-solid-waste ultra high performance concrete mortar prepared in example 1, and fig. 2 is a photograph of an extended surface of the quartz sand ultra high performance concrete mortar prepared in comparative example 1. As can be seen from fig. 1 and fig. 2, the fluidity of the concrete mortar can be improved by the combination of the iron tailings, the machine-made sand and the copper slag.
The 28d compressive strength and the flexural strength of the ultra-high performance concrete mortar prepared in the example 1 and the comparative example 1 are tested according to GB/T50081-. As can be seen from Table 1, the 28d compressive strength of the all-solid-waste ultra-high performance concrete mortar prepared in example 1 of the invention can reach 97.4% of that of the quartz sand ultra-high performance concrete mortar prepared in comparative example 1, the 28d flexural strength can reach 96.88% of that of comparative example 1, and the fluidity is higher than that of comparative example 1.
TABLE 1 Properties of ultra high Performance concrete mortars prepared in example 1 and comparative example 1
| Fluidity (mm) | Flexural strength (MPa) | Compressive strength (MPa) | |
| Comparative example 1 | 169 | 20.54 | 117.99 |
| Example 1 | 180 | 19.9 | 115.03 |
Fig. 3 is a graph showing cumulative pore volumes of the ultra-high performance concrete mortars prepared in example 1 and comparative example 1, and fig. 4 is a pore distribution diagram of the ultra-high performance concrete mortars prepared in example 1 and comparative example 1. As can be seen from fig. 4, the porosity of the quartz sand ultra high performance concrete mortar prepared in comparative example 1 was 2.61%, and the porosity of the all-solid-waste ultra high performance concrete mortar prepared in example 1 was 4.79%, which was increased by only 2.18%. Generally, the pores in concrete can be classified into 4 types, gel pores (less than 10nm), mesopores (10-100 nm), capillary pores (100-1000 nm), and megaspore pores (greater than 1000nm), wherein pores less than 100nm are considered to be harmless or minimally harmful to concrete. As can be seen from FIG. 3, the increased pore diameter of the all-solid-waste ultra-high performance concrete mortar prepared in example 1 of the present invention is mostly gel pores of less than 10nm, which are harmless pores.
The above examples show that the all-solid-waste ultrahigh-performance concrete mortar provided by the invention has good fluidity, excellent compressive strength and flexural strength, the fluidity is 180mm, the 28d compressive strength is 115.03MPa, and the 28d flexural strength is 19.9 MPa.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The full-solid-waste ultra-high performance concrete mortar comprises the following components in parts by weight: 920-930 parts of iron tailings, 195-205 parts of machine-made sand, 195-205 parts of copper slag, 700-705 parts of cement, 175-180 parts of silica fume, 162-165 parts of water and 18-22 parts of a water reducing agent.
2. The full-solid waste ultra-high performance concrete mortar of claim 1, wherein the full-solid waste ultra-high performance concrete mortar comprises the following components in parts by weight: 924-928 parts of iron tailings, 200-205 parts of machine-made sand, 200-205 parts of copper slag, 700-702 parts of cement, 176-178 parts of silica fume, 164-165 parts of water and 20-22 parts of a water reducing agent.
3. The all-solid-waste ultra-high performance concrete mortar of claim 1 or 2, wherein the iron tailings are graded as follows: 215-225 parts of iron tailings with the particle size of less than 0.075mm, 335-340 parts of iron tailings with the particle size of 0.075-0.15 mm, and 360-365 parts of iron tailings with the particle size of 0.15-0.30 mm.
4. The all-solid-waste ultra-high performance concrete mortar according to claim 1 or 2, wherein the grain size of the machine-made sand is 0.3-0.6 mm.
5. The all-solid-waste ultra-high performance concrete mortar as claimed in claim 1 or 2, wherein the particle size of the copper slag is 0.6-1.25 mm.
6. The preparation method of the full-solid waste ultra-high performance concrete mortar of any one of claims 1 to 5, comprising the following steps:
(1) mixing iron tailings, machine-made sand and copper slag, and stirring to obtain a mixture A;
(2) mixing the mixture A obtained in the step (1) with cement and silica fume, and then stirring to obtain a mixture B;
(3) mixing the mixture B obtained in the step (2) with part of water and a water reducing agent, and then stirring to obtain a mixture C;
(4) and (4) mixing the mixture C obtained in the step (3) with the rest of water, stirring, and curing to obtain the full-solid waste ultra-high performance concrete mortar.
7. The method according to claim 6, wherein the stirring speed in the step (1), the step (2) and the step (3) is independently 140 ± 5r/min of rotation and 62 ± 5r/min of revolution; the stirring time in the step (1) and the step (2) is independently 1-1.5 min, and the stirring time in the step (3) is 2-2.5 min.
8. The production method according to claim 6, wherein the stirring in the step (4) includes low-speed stirring and high-speed stirring.
9. The preparation method according to claim 8, wherein the low-speed stirring speed is 140 ± 5r/min of rotation and 62 ± 5r/min of revolution, and the low-speed stirring time is 1-2 min; the high-speed stirring speed is 285 +/-10 r/min of rotation and 125 +/-10 r/min of revolution, and the high-speed stirring time is 1-2 min.
10. The method of claim 6, wherein: the curing temperature in the step (4) is 60-65 ℃, and the curing time is 3-5 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111515367.3A CN114671651A (en) | 2021-12-13 | 2021-12-13 | Full-solid-waste ultra-high-performance concrete mortar and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111515367.3A CN114671651A (en) | 2021-12-13 | 2021-12-13 | Full-solid-waste ultra-high-performance concrete mortar and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114671651A true CN114671651A (en) | 2022-06-28 |
Family
ID=82070258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111515367.3A Pending CN114671651A (en) | 2021-12-13 | 2021-12-13 | Full-solid-waste ultra-high-performance concrete mortar and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114671651A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116535162A (en) * | 2023-05-08 | 2023-08-04 | 天津水泥工业设计研究院有限公司 | Ultra-high performance concrete prepared by multi-solid waste cooperation and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751866A (en) * | 2018-07-19 | 2018-11-06 | 成都宏基建材股份有限公司 | A kind of copper ashes fine aggregate non-light tight concrete and preparation method thereof |
| CN110877968A (en) * | 2019-11-04 | 2020-03-13 | 东北大学 | Cement-based composite material using iron tailings and preparation method thereof |
| AU2020101143A4 (en) * | 2020-06-25 | 2020-07-30 | Qian'an Weisheng Solid Waste Environmental Protection Industry Co., Ltd | A Method For Preparing The Fast-Hardening Early-Strength High-Performance All-Solid Waste Concrete |
-
2021
- 2021-12-13 CN CN202111515367.3A patent/CN114671651A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751866A (en) * | 2018-07-19 | 2018-11-06 | 成都宏基建材股份有限公司 | A kind of copper ashes fine aggregate non-light tight concrete and preparation method thereof |
| CN110877968A (en) * | 2019-11-04 | 2020-03-13 | 东北大学 | Cement-based composite material using iron tailings and preparation method thereof |
| AU2020101143A4 (en) * | 2020-06-25 | 2020-07-30 | Qian'an Weisheng Solid Waste Environmental Protection Industry Co., Ltd | A Method For Preparing The Fast-Hardening Early-Strength High-Performance All-Solid Waste Concrete |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116535162A (en) * | 2023-05-08 | 2023-08-04 | 天津水泥工业设计研究院有限公司 | Ultra-high performance concrete prepared by multi-solid waste cooperation and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110818356B (en) | Preparation method of high-performance carbonized reinforced concrete | |
| CN102850011B (en) | Technological process for preparing active powder concrete by using iron tailing | |
| CN109928685B (en) | Quick-hardening early-strength concrete prepared from various industrial solid wastes and preparation method thereof | |
| CN109734395B (en) | Synchronous mortar containing slurry shield waste slurry and preparation method thereof | |
| CN104150840B (en) | C60 full-manufactured sand super high-rise pump concrete | |
| CN109279861B (en) | Self-compacting composite concrete, preparation method thereof and concrete wall brick | |
| CN111807777B (en) | Concrete with gold mine tailing powder as full aggregate and preparation method thereof | |
| CN112125543A (en) | Composite gel material prepared from bulk solid wastes and preparation method thereof | |
| CN114890757A (en) | Recycled aggregate concrete and preparation method thereof | |
| CN114671651A (en) | Full-solid-waste ultra-high-performance concrete mortar and preparation method thereof | |
| CN102581922A (en) | Preparation method for aerated concrete building blocks of quartz vein type gold mine tailings | |
| CN108546009B (en) | CaCO doped with multi-scale particle size3High performance concrete slurry admixture | |
| CN112266211B (en) | Early-strength low-shrinkage concrete containing waste stone powder and preparation method thereof | |
| CN113754362A (en) | Shield grouting material and preparation method thereof | |
| CN115849811B (en) | High-stability self-compaction concrete and preparation method thereof | |
| CN113955986B (en) | Composite filling material for exciting gangue solidification and preparation method thereof | |
| CN115010455B (en) | High-performance full-solid waste concrete and preparation method thereof | |
| CN115124298B (en) | High-strength recycled aggregate concrete prepared from waste stone powder and preparation method thereof | |
| JP6165447B2 (en) | Method for producing concrete with reduced bleeding | |
| CN111072299B (en) | Concrete mineral admixture based on steel slag flotation tail mud and preparation method thereof | |
| CN107352895B (en) | Regenerated plastering mortar and preparation method thereof | |
| CN111825356A (en) | High-activity regeneration auxiliary cementing material based on physical ball milling and chemical modification synergistic reinforcement of brick-concrete powder and preparation method thereof | |
| CN111533508A (en) | Early anti-cracking high-strength concrete and preparation method thereof | |
| CN110981393A (en) | High-strength gypsum self-leveling mortar | |
| RU2808259C1 (en) | Raw mix for production of foam concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220628 |
|
| RJ01 | Rejection of invention patent application after publication |