CN112279583A - Self-compacting concrete prepared from aluminum sludge - Google Patents
Self-compacting concrete prepared from aluminum sludge Download PDFInfo
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- CN112279583A CN112279583A CN202011082780.0A CN202011082780A CN112279583A CN 112279583 A CN112279583 A CN 112279583A CN 202011082780 A CN202011082780 A CN 202011082780A CN 112279583 A CN112279583 A CN 112279583A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to the technical field of building materials, and particularly discloses self-compacting concrete prepared from aluminum sludge, which comprises, by weight, 305-340 parts of cement, 80-90 parts of fly ash, 50-60 parts of aluminum sludge powder, 800-840 parts of fine aggregate, 910-940 parts of coarse aggregate, 5-7 parts of a water reducing agent and 160-180 parts of water. The invention has the characteristics of easily obtained raw materials, environmental protection, less cement consumption, lower manufacturing cost and more perfect component composition.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to self-compacting concrete prepared from aluminum sludge.
Background
The self-compacting concrete belongs to special concrete, has the characteristics of high fluidity, no segregation, uniformity, stability and the like, flows by virtue of self weight during pouring, is compacted without vibration, has slump expansion degree of not less than 550mm, is particularly suitable for pouring concrete structures and members with complicated shapes or dense reinforcing bars, and is widely applied to concrete engineering for maintenance and reinforcement.
Compared with common concrete, the self-compacting concrete greatly improves the construction and pouring speed, saves the on-site labor force, reduces or eliminates the vibration noise pollution, and improves the concrete pouring construction environment. Self-compacting concrete has comparatively strict requirement to raw and other materials, and the design of its mix proportion also is different from ordinary concrete, has hindered self-compacting concrete ground to a certain extent and has popularized and applied.
With the continuous development and progress of the self-compacting concrete technology, a great deal of research shows that some industrial solid wastes including various tailing stone powders can also be used for preparing the self-compacting concrete and are successfully applied in actual engineering, the manufacturing cost of the self-compacting concrete is greatly reduced, the possibility is provided for applying the self-compacting concrete to common engineering, and the application range of the self-compacting concrete is greatly expanded.
With the development of urban construction, the standards of tap water are higher and higher, and the demand of tap water is rising, so that more and more tap water plants with different scales are built. When tap water is produced by a water works, a certain amount of sludge of the water works is inevitably generated, and the sludge is greatly different from sewage sludge, commercial concrete mixing plant sludge, different types of pipeline sludge and the like, particularly main components of the sludge. The chemical composition of the sludge in the waterworks is greatly influenced by the properties of raw water pollutants, the process flow of tap water production, the type and the amount of a coagulant and the like. The currently used coagulants are mainly novel aluminum salt coagulants. Therefore, since the waterworks sludge generally contains a large amount of aluminum, the waterworks sludge is also called aluminum sludge. According to incomplete statistics, the annual production of aluminium sludge is over 15 billions of cubic meters for china alone. If the waste water is not reasonably recycled, not only a large amount of resources are wasted, but also serious environmental pollution is caused. With the increase of environmental awareness, it is urgently needed to perform efficient recycling treatment of a large amount of aluminum sludge.
The current technical method for disposing the aluminum sludge mainly comprises sanitary landfill, drying incineration, sewage purification and the like, has low utilization rate of the aluminum sludge and does not well exert the maximum value of the aluminum sludge. Researches show that the aluminum sludge has certain chemical potential activity and can be used for producing building materials such as ceramsite, bricks, some cement-based materials and the like.
Along with the rapid development of the economy of China, the pace of the basic construction project is accelerated, the demand of the self-compacting concrete is continuously promoted, cement is one of main components for preparing the self-compacting concrete, and along with the promotion of the demand of the self-compacting concrete, the consumption of the cement is increasingly large, so that the cost of the self-compacting concrete is continuously promoted. Therefore, the components of the self-compacting concrete need to be improved, and the compressive strength and the working performance of the self-compacting concrete are ensured on the premise of reducing the cement consumption and the cost.
Therefore, the existing concrete has the problems of more cement consumption, higher manufacturing cost and less perfect component composition.
Disclosure of Invention
The self-compacting concrete belongs to special concrete, has the characteristics of high fluidity, no segregation, uniformity, stability and the like, flows by virtue of self weight during pouring, is compacted without vibration, has slump expansion degree of not less than 550mm, is particularly suitable for pouring concrete structures and members with complicated shapes or dense reinforcing bars, and is widely applied to concrete engineering for maintenance and reinforcement.
Compared with common concrete, the self-compacting concrete greatly improves the construction and pouring speed, saves the on-site labor force, reduces or eliminates the vibration noise pollution, and improves the concrete pouring construction environment. Self-compacting concrete has comparatively strict requirement to raw and other materials, and the design of its mix proportion also is different from ordinary concrete, has hindered self-compacting concrete ground to a certain extent and has popularized and applied.
With the continuous development and progress of the self-compacting concrete technology, a great deal of research shows that some industrial solid wastes including various tailing stone powders can also be used for preparing the self-compacting concrete and are successfully applied in actual engineering, the manufacturing cost of the self-compacting concrete is greatly reduced, the possibility is provided for applying the self-compacting concrete to common engineering, and the application range of the self-compacting concrete is greatly expanded.
With the development of urban construction, the standards of tap water are higher and higher, and the demand of tap water is rising, so that more and more tap water plants with different scales are built. When tap water is produced by a water works, a certain amount of sludge of the water works is inevitably generated, and the sludge is greatly different from sewage sludge, commercial concrete mixing plant sludge, different types of pipeline sludge and the like, particularly main components of the sludge. The chemical composition of the sludge in the waterworks is greatly influenced by the properties of raw water pollutants, the process flow of tap water production, the type and the amount of a coagulant and the like. The currently used coagulants are mainly novel aluminum salt coagulants. Therefore, since the waterworks sludge generally contains a large amount of aluminum, the waterworks sludge is also called aluminum sludge. According to incomplete statistics, the annual production of aluminium sludge is over 15 billions of cubic meters for china alone. If the waste water is not reasonably recycled, not only a large amount of resources are wasted, but also serious environmental pollution is caused. With the increase of environmental awareness, it is urgently needed to perform efficient recycling treatment of a large amount of aluminum sludge.
The current technical method for disposing the aluminum sludge mainly comprises sanitary landfill, drying incineration, sewage purification and the like, has low utilization rate of the aluminum sludge and does not well exert the maximum value of the aluminum sludge. Researches show that the aluminum sludge has certain chemical potential activity and can be used for producing building materials such as ceramsite, bricks, some cement-based materials and the like.
Along with the rapid development of the economy of China, the pace of the basic construction project is accelerated, the demand of the self-compacting concrete is continuously promoted, cement is one of main components for preparing the self-compacting concrete, and along with the promotion of the demand of the self-compacting concrete, the consumption of the cement is increasingly large, so that the cost of the self-compacting concrete is continuously promoted. Therefore, the components of the self-compacting concrete need to be improved, and the compressive strength and the working performance of the self-compacting concrete are ensured on the premise of reducing the cement consumption and the cost.
Therefore, the existing concrete has the problems of more cement consumption, higher manufacturing cost and less perfect component composition.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
The self-compacting concrete prepared by adopting the aluminum sludge comprises the following components in parts by weight,
305-340 parts of cement, 80-90 parts of fly ash, 50-60 parts of aluminum sludge powder, 800-840 parts of fine aggregate, 910-940 parts of coarse aggregate, 5-7 parts of water reducing agent and 160-180 parts of water.
Cement, fly ash and aluminum sludge powder form a cementing material, and the water-to-gel ratio is 0.35-0.4; the strength grade of the self-compacting concrete is C25-C35; the cement is 42.5 cement; the fly ash is I-grade fly ash.
The preparation method of the aluminum sludge powder comprises the following steps,
selecting sludge from a water works, drying, calcining for 1-3 hours at the temperature of 600-800 ℃, and grinding to obtain the product.
The specific surface area of the aluminum sludge powder is more than or equal to 425m2Per kg; the 28-day activity index of the aluminum sludge powder is more than or equal to 85 percent; al in aluminum sludge powder2O3And SiO2The mass fraction of (A) is more than 35%.
The fine aggregate is prepared by mixing aluminum sludge and river sand; the mass ratio of the aluminum sludge to the river sand in the fine aggregate is 1: (2-5).
The preparation method of the aluminum sludge in the fine aggregate comprises the following steps,
selecting sludge from a water plant, drying, roasting at the temperature of 200-300 ℃ for 1-3 hours, and sieving to obtain aluminum sludge particles with the particle size not greater than 5 mm;
the river sand is medium sand, and the grain composition of the river sand is a II area, so that the technical requirements of I type or II type are met.
The fineness modulus of aluminum sludge particles in the fine aggregate is 2.5-3.0; the particle size of the aluminum sludge particles in the fine aggregate is set as a zone II.
The coarse aggregate is prepared by mixing aluminum sludge and crushed stone; the mass ratio of the aluminum sludge to the crushed stones in the coarse aggregate is 1: (2-5).
The preparation method of the aluminum sludge in the coarse aggregate comprises the following steps,
selecting sludge from a waterworks, drying, roasting for 1-3 hours at the temperature of 200-300 ℃, and sieving to obtain aluminum sludge particles with the particle size of 5-20 mm;
the particle size of the broken stone is 5-20 mm, and the broken stone meets the technical requirements of class I or class II.
The water reducing agent is a sulfamic acid water reducing agent, and the solid content in the water reducing agent is not less than 20%.
Example 1:
the self-compacting concrete prepared by adopting the aluminum sludge comprises the following components in parts by weight,
305 parts of cement, 80 parts of fly ash, 50 parts of aluminum sludge powder, 800 parts of fine aggregate, 910 parts of coarse aggregate, 5.3 parts of water reducing agent and 174 parts of water.
Cement, fly ash and aluminum sludge powder form a cementing material, and the water-to-gel ratio is 0.4; the strength grade of the self-compacting concrete is C25-C35; the cement is 42.5 cement; the fly ash is I-grade fly ash.
The preparation method of the aluminum sludge powder comprises the following steps,
selecting sludge from a water works, drying, calcining for 1 hour at the temperature of 600 ℃, and grinding to obtain the product.
The specific surface area of the aluminum sludge powder is more than or equal to 425m2Per kg; the 28-day activity index of the aluminum sludge powder is more than or equal to 85 percent; al in aluminum sludge powder2O3And SiO2The mass fraction of (A) is more than 35%.
The fine aggregate is prepared by mixing aluminum sludge and river sand; the mass ratio of the aluminum sludge to the river sand in the fine aggregate is 1: 2.
the preparation method of the aluminum sludge in the fine aggregate comprises the following steps,
selecting sludge from a waterworks, drying, roasting for 1 hour at the temperature of 200 ℃, and sieving to obtain aluminum sludge particles with the particle size of not more than 5 mm;
the river sand is medium sand, and the grain composition of the river sand is a II area, so that the technical requirements of I type or II type are met.
The fineness modulus of the aluminum sludge particles in the fine aggregate is 2.5; the particle size of the aluminum sludge particles in the fine aggregate is set as a zone II.
The coarse aggregate is prepared by mixing aluminum sludge and crushed stone; the mass ratio of the aluminum sludge to the crushed stones in the coarse aggregate is 1: 2.
the preparation method of the aluminum sludge in the coarse aggregate comprises the following steps,
selecting sludge from a waterworks, drying, roasting for 1 hour at the temperature of 200 ℃, and sieving to obtain aluminum sludge particles with the particle size of 5-20 mm;
the particle size of the broken stone is 5-20 mm, and the broken stone meets the technical requirements of class I or class II.
The water reducing agent is a sulfamic acid water reducing agent, and the solid content in the water reducing agent is not less than 20%.
The workability and 28-day compressive strength of the self-compacting concrete prepared with the aluminum sludge obtained in this example are shown in table 1.
Example 2:
the self-compacting concrete prepared by adopting the aluminum sludge comprises the following components in parts by weight,
320 parts of cement, 85 parts of fly ash, 55 parts of aluminum sludge powder, 825 parts of fine aggregate, 925 parts of coarse aggregate, 6.1 parts of water reducing agent and 170 parts of water.
Cement, fly ash and aluminum sludge powder form a cementing material, and the water-to-gel ratio is 0.37; the strength grade of the self-compacting concrete is C25-C35; the cement is 42.5 cement; the fly ash is I-grade fly ash.
The preparation method of the aluminum sludge powder comprises the following steps,
selecting sludge from a water works, drying, calcining for 2 hours at the temperature of 700 ℃, and grinding to obtain the product.
The specific surface area of the aluminum sludge powder is more than or equal to 425m2Per kg; the 28-day activity index of the aluminum sludge powder is more than or equal to 85 percent; al in aluminum sludge powder2O3And SiO2The mass fraction of (A) is more than 35%.
The fine aggregate is prepared by mixing aluminum sludge and river sand; the mass ratio of the aluminum sludge to the river sand in the fine aggregate is 1: 4.
the preparation method of the aluminum sludge in the fine aggregate comprises the following steps,
selecting sludge from a waterworks, drying, roasting for 2 hours at the temperature of 250 ℃, and sieving to obtain aluminum sludge particles with the particle size of not more than 5 mm;
the river sand is medium sand, and the grain composition of the river sand is a II area, so that the technical requirements of I type or II type are met.
The fineness modulus of the aluminum sludge particles in the fine aggregate is 2.7; the particle size of the aluminum sludge particles in the fine aggregate is set as a zone II.
The coarse aggregate is prepared by mixing aluminum sludge and crushed stone; the mass ratio of the aluminum sludge to the crushed stones in the coarse aggregate is 1: 4.
the preparation method of the aluminum sludge in the coarse aggregate comprises the following steps,
selecting sludge from a waterworks, drying, roasting for 2 hours at the temperature of 250 ℃, and sieving to obtain aluminum sludge particles with the particle size of 5-20 mm;
the particle size of the broken stone is 5-20 mm, and the broken stone meets the technical requirements of class I or class II.
The water reducing agent is a sulfamic acid water reducing agent, and the solid content in the water reducing agent is not less than 20%.
The workability and 28-day compressive strength of the self-compacting concrete prepared with the aluminum sludge obtained in this example are shown in table 1.
Example 3:
the self-compacting concrete prepared by adopting the aluminum sludge comprises the following components in parts by weight,
340 parts of cement, 90 parts of fly ash, 60 parts of aluminum sludge powder, 820 parts of fine aggregate, 920 parts of coarse aggregate, 6.8 parts of water reducing agent and 171.5 parts of water.
Cement, fly ash and aluminum sludge powder form a cementing material, and the water-to-gel ratio is 0.35; the strength grade of the self-compacting concrete is C25-C35; the cement is 42.5 cement; the fly ash is I-grade fly ash.
The preparation method of the aluminum sludge powder comprises the following steps,
selecting sludge from a water works, drying, calcining for 3 hours at the temperature of 800 ℃, and grinding to obtain the product.
The specific surface area of the aluminum sludge powder is more than or equal to 425m2Per kg; the 28-day activity index of the aluminum sludge powder is more than or equal to 85 percent; al in aluminum sludge powder2O3And SiO2The mass fraction of (A) is more than 35%.
The fine aggregate is prepared by mixing aluminum sludge and river sand; the mass ratio of the aluminum sludge to the river sand in the fine aggregate is 1: 5.
the preparation method of the aluminum sludge in the fine aggregate comprises the following steps,
selecting sludge from a waterworks, drying, roasting for 3 hours at the temperature of 300 ℃, and sieving to obtain aluminum sludge particles with the particle size of not more than 5 mm;
the river sand is medium sand, and the grain composition of the river sand is a II area, so that the technical requirements of I type or II type are met.
The fineness modulus of the aluminum sludge particles in the fine aggregate is 3.0; the particle size of the aluminum sludge particles in the fine aggregate is set as a zone II.
The coarse aggregate is prepared by mixing aluminum sludge and crushed stone; the mass ratio of the aluminum sludge to the crushed stones in the coarse aggregate is 1: 5.
the preparation method of the aluminum sludge in the coarse aggregate comprises the following steps,
selecting sludge from a waterworks, drying, roasting for 3 hours at the temperature of 300 ℃, and sieving to obtain aluminum sludge particles with the particle size of 5-20 mm;
the particle size of the broken stone is 5-20 mm, and the broken stone meets the technical requirements of class I or class II.
The water reducing agent is a sulfamic acid water reducing agent, and the solid content in the water reducing agent is not less than 20%.
The workability and 28-day compressive strength of the self-compacting concrete prepared with the aluminum sludge obtained in this example are shown in table 1.
Table 1: working performance and 28-day compressive strength of self-compacting concrete prepared from aluminum sludge
Claims (10)
1. The self-compacting concrete prepared from the aluminum sludge is characterized in that: comprises the following components in parts by weight,
305-340 parts of cement, 80-90 parts of fly ash, 50-60 parts of aluminum sludge powder, 800-840 parts of fine aggregate, 910-940 parts of coarse aggregate, 5-7 parts of water reducing agent and 160-180 parts of water.
2. The self-compacting concrete prepared from aluminum sludge according to claim 1, wherein: the cement, the fly ash and the aluminum sludge powder form a cementing material, and the water-to-gel ratio is 0.35-0.4; the strength grade of the self-compacting concrete is C25-C35; the cement is 42.5 cement; the fly ash is I-grade fly ash.
3. The self-compacting concrete prepared from aluminum sludge according to claim 1, wherein: the preparation method of the aluminum sludge powder comprises the following steps,
selecting sludge from a water works, drying, calcining for 1-3 hours at the temperature of 600-800 ℃, and grinding to obtain the product.
4. The self-compacting concrete prepared from aluminum sludge according to claim 1, wherein: the specific surface area of the aluminum sludge powder is more than or equal to 425m2Per kg; the 28-day activity index of the aluminum sludge powder is more than or equal to 85 percent; al in the aluminum sludge powder2O3And SiO2The mass fraction of (A) is more than 35%.
5. The self-compacting concrete prepared from aluminum sludge according to claim 1, wherein: the fine aggregate is prepared by mixing aluminum sludge and river sand; the mass ratio of the aluminum sludge to the river sand in the fine aggregate is 1: (2-5).
6. The self-compacting concrete prepared from aluminum sludge according to claim 5, wherein: the preparation method of the aluminum sludge in the fine aggregate comprises the following steps,
selecting sludge from a water plant, drying, roasting at the temperature of 200-300 ℃ for 1-3 hours, and sieving to obtain aluminum sludge particles with the particle size not greater than 5 mm;
the river sand is medium sand, and the grain composition of the river sand is a II area, so that the technical requirements of I type or II type are met.
7. The self-compacting concrete prepared from aluminum sludge according to claim 6, wherein: the fineness modulus of the aluminum sludge particles in the fine aggregate is 2.5-3.0; the particle size distribution of the aluminum sludge particles in the fine aggregate is a zone II.
8. The self-compacting concrete prepared from aluminum sludge according to claim 1, wherein: the coarse aggregate is prepared by mixing aluminum sludge and crushed stone; the mass ratio of the aluminum sludge to the crushed stones in the coarse aggregate is 1: (2-5).
9. The self-compacting concrete prepared from aluminum sludge according to claim 8, wherein: the preparation method of the aluminum sludge in the coarse aggregate comprises the following steps,
selecting sludge from a waterworks, drying, roasting for 1-3 hours at the temperature of 200-300 ℃, and sieving to obtain aluminum sludge particles with the particle size of 5-20 mm;
the particle size of the macadam is 5-20 mm, and the technical requirements of I type or II type are met.
10. The self-compacting concrete prepared from aluminum sludge according to claim 1, wherein: the water reducing agent is a sulfamic acid water reducing agent, and the solid content in the water reducing agent is not less than 20%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113480279A (en) * | 2021-08-09 | 2021-10-08 | 艾思尔信息科技(上海)有限公司 | Aluminum foil sludge-based cementing material and preparation method thereof |
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Cited By (2)
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| CN113480279A (en) * | 2021-08-09 | 2021-10-08 | 艾思尔信息科技(上海)有限公司 | Aluminum foil sludge-based cementing material and preparation method thereof |
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Application publication date: 20210129 |