CN113087465A - Method for preparing green ultrahigh-performance concrete by using construction waste in full component manner - Google Patents
Method for preparing green ultrahigh-performance concrete by using construction waste in full component manner Download PDFInfo
- Publication number
- CN113087465A CN113087465A CN202110347761.4A CN202110347761A CN113087465A CN 113087465 A CN113087465 A CN 113087465A CN 202110347761 A CN202110347761 A CN 202110347761A CN 113087465 A CN113087465 A CN 113087465A
- Authority
- CN
- China
- Prior art keywords
- concrete
- waste
- construction waste
- micron
- powder
- 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.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for preparing green ultrahigh-performance concrete by utilizing construction wastes in a full-component manner, which takes the construction wastes as main raw materials; the preparation method comprises the steps of preparing a green ultra-high performance concrete cementing material, performing superfine treatment on raw materials by using a mill, preparing a nano-micron grade superfine admixture by using solid construction waste as the raw materials, and using the nano-micron grade solid construction waste as an early strength agent to promote the concrete to form closest accumulation and improve the compactness of the concrete. In consideration of the problems that a large amount of solid construction waste generated in the construction industry causes pollution to the ecological environment and the like, the invention improves the utilization rate of the solid construction waste and reduces the production cost of the ultra-high performance concrete. Provides a method for preparing green ultra-high performance concrete by utilizing construction waste in a full component manner.
Description
Technical Field
The invention relates to the field of concrete, in particular to a method for preparing green ultrahigh-performance concrete by utilizing construction waste in a full-component manner.
Background
The raw materials for preparing the green ultra-high performance concrete by utilizing the construction wastes are common portland cement (P.I 52.5), waste aerated concrete blocks, quartz sand, steel fibers, a polycarboxylic acid high performance water reducing agent and the like, and the production cost is 2-3 times that of the common concrete. In most projects, traditional concrete can meet performance requirements, and ultrahigh-performance concrete is expensive and difficult to replace traditional concrete, so that popularization of the concrete is limited. The waste aerated concrete is crushed and separated, and then wet grinding is carried out to replace part of cementing materials, so that full components are utilized, the production cost of the cementing materials is reduced to a certain extent, and the mechanical property of the concrete is improved; the waste aerated concrete construction waste is utilized in the whole component, so that the exploitation of natural sand stones in the construction industry is reduced, and the secondary utilization efficiency of the construction waste is improved; the waste aerated concrete building garbage is utilized to prepare the green ultra-high performance concrete, thereby achieving the purposes of protecting the natural environment and reducing the energy consumption and generating good economic benefit, social benefit and environmental protection benefit.
CN109584973A discloses a design and preparation method of building waste powder-based ecological ultra-high performance concrete, which adopts building waste powder to replace part of cementing materials, reduces the cement consumption, is ecological and environment-friendly, but has insufficient mechanical properties.
CN109293311A discloses an ultrahigh-performance concrete slurry, an ultrahigh-performance concrete and a preparation method thereof, wherein the material components comprise cement, micro silicon powder, nano silicon dioxide, quartz powder, silica sand, steel fiber, a water reducing agent and water, an experimental formula is calculated through a closest packing model, and the ultrahigh-performance concrete with excellent mechanical properties is prepared, but the ultrahigh-performance concrete has multiple material types, high cost and no application popularization.
The green concrete is a necessary result of modern concrete technical development, is a necessary direction of concrete development, has increasing demand for ultra-high performance concrete, and adheres to the principle of sustainable development on the premise of meeting the production and use requirements of modern concrete. Therefore, the research and development of the green ultrahigh-performance concrete prepared by using the construction waste in all components has very important significance.
Disclosure of Invention
The invention aims to solve the technical problems and provides the preparation method of the green ultrahigh-performance concrete, which has the advantages of simple process, low energy consumption, low production cost, environmental friendliness and high waste residue utilization rate.
In order to achieve the purpose, the invention provides a method for preparing green ultra-high performance concrete by utilizing construction waste in full components, which is characterized by comprising the following steps: the method comprises the following steps:
s1: feeding the solid massive construction waste into a middle crusher for crushing to obtain solid construction waste aggregate; then feeding the solid construction waste aggregate into a horizontal ball mill for grinding to obtain solid construction waste powder;
s2: separating the solid construction waste powder in the step S1 through a liquid phase grinding system to obtain a siliceous raw material and solid construction waste powder slurry;
s3: feeding the solid construction waste powder slurry obtained by separation in the step S2 into a vertical ball mill for wet grinding, and controlling the grinding time to obtain micron-grade and nano-micron-grade solid construction waste powder slurry;
s4: and (3) uniformly mixing and stirring the solid construction waste aggregate and the solid construction waste powder in the step S1, the siliceous raw material in the step S2, the micron-sized and nano-micron-sized solid massive construction waste powder slurry obtained in the step S3, the siliceous raw material powder and the cement in proportion, feeding the mixture into a stirrer for continuous stirring, sequentially adding water, a polycarboxylic acid high-performance water reducer and copper-plated steel fibers, and stirring and forming to obtain the green ultrahigh-performance concrete prepared by utilizing the construction waste in all components.
Preferably, in step S1, the solid massive construction waste is waste aerated concrete blocks, the solid construction waste aggregate is waste aerated concrete block aggregate, and the solid construction waste powder is waste aerated concrete powder; the waste aerated concrete block mainly comprises cement, fly ash, gypsum and quartz sand;
in the step S2, the siliceous raw material is quartz sand, and the solid construction waste powder slurry is waste aerated concrete powder slurry.
Further, in the step S3, the waste aerated concrete powder slurry with the solid content of 45% is subjected to wet grinding to obtain micron-sized and nano-micron-sized waste aerated powder slurries.
Further, in the step S1 and the step S3, the crusher is a jaw crusher, the feed particle size is less than 50cm, and the liquid phase grinding system is a linear concrete sand-stone separator;
in the step S1, the capacity of the jaw ball mill is 50-120t/h, and the grinding time of the jaw ball mill is 30-60 min;
the working time of the linear concrete sand-stone separator in the step S2 is 8-10 min;
the rotating speed of the vertical ball mill in the step S3 is 400 rad/min.
Further, the specific process of step S4 is as follows:
pre-stirring portland cement, micron-grade and nano-micron-grade waste aerated powder slurry for 2min, adding solid construction waste aggregate and solid construction waste powder, and stirring for 1 min; adding a mixture of water and the polycarboxylic acid high-performance water reducing agent twice during stirring; continuously stirring the concrete slurry, then uniformly adding the steel fibers, and stirring for 8min to obtain the green ultrahigh-performance concrete prepared from the construction waste in full components;
the nano-micron waste aerated concrete powder slurry is mainly used as a green ultra-high performance concrete superfine admixture, so that the internal curing performance of waste aerated concrete is improved;
the total amount of the polycarboxylic acid high-performance water reducing agent accounts for 0.4-0.7% of the cementing material.
Furthermore, in the step S4, the solid construction waste powder replaces quartz sand, and the nano-micron waste aerated powder slurry replaces part of silica fume, so that the use amount of silica fume is reduced, and the production cost of concrete is reduced; the waste aerated block powder slurry with the particle size of 10-14 mu m is obtained by controlling the wet grinding time, and the micron-sized waste aerated block powder slurry is used for replacing cement, so that the full-component utilization of building wastes for preparing green ultrahigh-performance concrete is promoted; the waste aerated concrete building garbage is treated to reach different particle sizes, and is filled at different levels, so that the compactness of concrete is improved, and a closest packing model is formed.
As most preferred embodiments, reference is made to the following:
s1: feeding the waste aerated concrete blocks into a middle crusher for crushing to obtain waste aerated concrete block aggregates; feeding the crushed waste aerated concrete blocks into a horizontal ball mill for grinding to obtain waste aerated concrete powder; the average grain diameter of the waste aerated concrete powder is 0.5-1.0 mm;
s2: separating the waste aerated concrete powder in the step S1 through a liquid phase grinding system to obtain quartz sand and waste aerated concrete powder slurry; the average grain diameter of the quartz sand is 0.8-1.5 mm;
s3: feeding the waste aerated concrete powder slurry separated in the step S2 into a vertical ball mill for wet grinding to obtain micron-grade and nano-micron-grade waste aerated concrete powder slurry; obtaining waste aerated concrete powder slurry with the particle size of 10-14 mu m and the particle size of 300-400nm by different wet grinding time; mixing waste aerated concrete powder slurry and water according to a corresponding proportion (the water-material ratio is 3:4), then carrying out wet grinding for 25-35min, standing for 5-10min, repeating for at least 3 times, wherein the total grinding time is 85-125 min, and obtaining nano-micron powder slurry with the particle size of 200-300 nm; along with the increase of the wet grinding time, the temperature of the machine and the aggregate rises, and the phenomenon that the grinding efficiency of the machine is reduced due to overhigh temperature of the machine and the aggregate can be effectively relieved by standing;
s4: uniformly mixing and stirring 600 parts by mass of the solid waste aerated block aggregate obtained in the step S1, 200 parts by mass of the waste aerated concrete powder, 25-45 parts by mass of the nano-micron waste aerated concrete powder slurry obtained in the step S3, 50-90 parts by mass of the micron waste aerated concrete powder slurry and 450 parts by mass of the cement in a certain proportion, sending the mixture into a stirrer for continuous stirring, sequentially adding 225 parts by mass of water in 125, 4-7 parts by mass of a polycarboxylic acid high-performance water reducing agent and 50-80 parts by mass of copper-plated steel fiber, and stirring and molding to obtain green ultrahigh-performance concrete; the polycarboxylic acid high-performance water reducing agent is a self-made water reducing agent, and the solid content is 40%; the length-diameter ratio of the steel fiber is 47-56.
The invention has the following advantages and beneficial effects:
1. the wet grinding process utilizes the advantages of high wet grinding efficiency, low energy consumption and optimized particle size distribution of particles. The waste gas-adding block contains SiO2(36.0％)，CaO(22.4％)，Al2O3(18.5%) and the like, wherein the silicon dioxide is used as a wet grinding medium, and the activity of the waste aerated block powder is excited through wet grinding, so that the prepared nano-micron waste aerated slurry early strength agent has the characteristics of no pollution and high dispersion stability.
2. According to the invention, the waste aerated concrete powder and water are subjected to wet grinding, micron-grade and nano-micron-grade waste aerated concrete powder slurry is obtained by controlling the grinding time, and micro-pores generated in concrete by a cementing material are filled in the micron-grade and nano-micron-grade waste aerated concrete powder slurry, so that the internal compactness of the concrete is increased. Carrying out wet grinding on waste aerated concrete powder and water to facilitate the preparation of superfine active slurry; the waste aerated concrete powder is used as fine powder to replace quartz powder and other fine powder.
3. According to the invention, the quartz sand is separated by adopting a liquid-phase grinding system, so that the application of the aggregate is reduced to a certain extent, and meanwhile, the utilization way of the waste building materials is expanded.
4. The preparation method adopts wet grinding, and the nano-micron waste aerated concrete powder slurry replaces silica fume, so that the construction cost is saved, the use amount of materials such as silica fume, cement, quartz powder and the like is reduced, the production cost of the ultra-high performance concrete is reduced, the current situation of stacking construction waste is relieved, and the green sustainable development of the cement-based materials is promoted to a certain extent.
Drawings
FIG. 1 is an SEM image of spent aerated concrete and wet-milled nano-micron spent aerated concrete;
FIG. 2 is a graph of compressive strength of nano waste aerated concrete with different doping amounts.
Detailed Description
In order to further illustrate the contents of the present invention, the following examples are specifically enumerated to further describe the present invention in detail. The examples are given by way of illustration to prepare the following green ultra high performance concrete, specific examples of which are as follows:
example 1
In the embodiment, the raw materials for preparing the green ultrahigh-performance concrete by using the construction wastes are generally ordinary portland cement (P.I 52.5), waste aerated concrete blocks, quartz sand, steel fibers, a polycarboxylic acid high-performance water reducing agent and the like according to the mass ratio, and the preparation method comprises the following steps:
s1: feeding the waste aerated concrete blocks into a middle crusher for crushing to obtain waste aerated concrete block aggregates; feeding the crushed waste aerated concrete blocks into a horizontal ball mill for grinding to obtain waste aerated concrete powder;
s2: separating the waste aerated concrete powder in the step S1 through a liquid phase grinding system to obtain quartz sand and waste aerated concrete powder slurry;
s3: feeding the waste aerated concrete powder slurry separated in the step S2 into a vertical ball mill for wet grinding, and controlling the grinding time to obtain micron-grade and nano-micron-grade waste aerated concrete powder slurry;
s4: uniformly mixing and stirring 600 parts by mass of the solid waste aerated block aggregate obtained in the step S1, 200 parts by mass of the waste aerated concrete powder, 25-45 parts by mass of the nano-micron waste aerated concrete powder slurry obtained in the step S3 and 50 parts by mass of the micron waste aerated concrete powder slurry (the nano-micron powder slurry accounts for 2% of the gelled material), 450 parts by mass of cement 250-containing material and 400 parts by mass of quartz sand 300-containing material according to a certain proportion, sending the mixture into a stirrer for continuous stirring, sequentially adding 225 parts by mass of water 125-containing material, 4-7 parts by mass of a polycarboxylic acid high-performance water reducer and 50-80 parts by mass of copper-plated steel fiber, and stirring and molding to obtain green ultrahigh-performance concrete;
example 2
In the embodiment, the raw materials for preparing the green ultrahigh-performance concrete by using the construction wastes are generally ordinary portland cement (P.I 52.5), waste aerated concrete blocks, quartz sand, steel fibers, a polycarboxylic acid high-performance water reducing agent and the like according to the mass ratio, and the preparation method comprises the following steps:
s1: feeding the waste aerated concrete blocks into a middle crusher for crushing to obtain waste aerated concrete block aggregates; feeding the crushed waste aerated concrete blocks into a horizontal ball mill for grinding to obtain waste aerated concrete powder;
s2: separating the waste aerated concrete powder in the step S1 through a liquid phase grinding system to obtain quartz sand and waste aerated concrete powder slurry;
s3: feeding the waste aerated concrete powder slurry separated in the step S2 into a vertical ball mill for wet grinding, and controlling the grinding time to obtain micron-grade and nano-micron-grade waste aerated concrete powder slurry;
s4: uniformly mixing and stirring 600 parts by mass of the solid waste aerated block aggregate obtained in the step S1, 200 parts by mass of the waste aerated concrete powder, 25-45 parts by mass of the nano-micron waste aerated concrete powder slurry obtained in the step S3 and 60 parts by mass of the micron waste aerated concrete powder slurry (the nano-micron powder slurry accounts for 4% of the gelled material), 450 parts by mass of cement 250-type and 400 parts by mass of quartz sand 300-type into a stirrer, continuously stirring, sequentially adding 225 parts by mass of water 125-type, 4-7 parts by mass of a polycarboxylic acid high-performance water reducer and 50-80 parts by mass of copper-plated steel fibers, and stirring and molding to obtain green ultrahigh-performance concrete;
example 3
In the embodiment, the raw materials for preparing the green ultrahigh-performance concrete by using the construction wastes are generally ordinary portland cement (P.I 52.5), waste aerated concrete blocks, quartz sand, steel fibers, a polycarboxylic acid high-performance water reducing agent and the like according to the mass ratio, and the preparation method comprises the following steps:
s1: feeding the waste aerated concrete blocks into a middle crusher for crushing to obtain waste aerated concrete block aggregates; feeding the crushed waste aerated concrete blocks into a horizontal ball mill for grinding to obtain waste aerated concrete powder;
s2: separating the waste aerated concrete powder in the step S1 through a liquid phase grinding system to obtain quartz sand and waste aerated concrete powder slurry;
s3: feeding the waste aerated concrete powder slurry separated in the step S2 into a vertical ball mill for wet grinding to obtain micron-grade and nano-micron-grade waste aerated concrete powder slurry;
s4: uniformly mixing and stirring 600 parts by mass of the solid waste aerated block aggregate obtained in the step S1, 200 parts by mass of the waste aerated concrete powder, 25-45 parts by mass of the nano-micron waste aerated concrete powder slurry obtained in the step S3 and 70 parts by mass of the micron waste aerated concrete powder slurry (the nano-micron powder slurry accounts for 6 percent of the gelled material), 450 parts by mass of cement 250-type and 400 parts by mass of quartz sand 300-type, feeding the mixture into a stirrer for continuous stirring, sequentially adding 125-type water, 225 parts by mass of polycarboxylic acid, 4-7 parts by mass of a high-performance water reducing agent and 50-80 parts by mass of copper-plated steel fibers, and stirring and molding to obtain green ultrahigh-performance concrete;
example 4
In the embodiment, the raw materials for preparing the green ultrahigh-performance concrete by using the construction wastes are generally ordinary portland cement (P.I 52.5), waste aerated concrete blocks, quartz sand, steel fibers, a polycarboxylic acid high-performance water reducing agent and the like according to the mass ratio, and the preparation method comprises the following steps:
s1: feeding the waste aerated concrete blocks into a middle crusher for crushing to obtain waste aerated concrete block aggregates; feeding the crushed waste aerated concrete blocks into a horizontal ball mill for grinding to obtain waste aerated concrete powder;
s2: separating the waste aerated concrete powder in the step S1 through a liquid phase grinding system to obtain quartz sand and waste aerated concrete powder slurry;
s3: feeding the waste aerated concrete powder slurry separated in the step S2 into a vertical ball mill for wet grinding to obtain micron-grade and nano-micron-grade waste aerated concrete powder slurry;
s4: uniformly mixing and stirring 600 parts by mass of the solid waste aerated block aggregate obtained in the step S1, 200 parts by mass of the waste aerated concrete powder, 25-45 parts by mass of the nano-micron waste aerated concrete powder slurry obtained in the step S3 and 80 parts by mass of the micron waste aerated concrete powder slurry (the nano-micron powder slurry accounts for 8 percent of the gelled material), 450 parts by mass of cement 250-type and 400 parts by mass of quartz sand 300-type into a stirrer, continuously stirring, sequentially adding 225 parts by mass of water 125-type, 4-7 parts by mass of a polycarboxylic acid high-performance water reducer and 50-80 parts by mass of copper-plated steel fibers, and stirring and molding to obtain green ultrahigh-performance concrete;
example 5
In the embodiment, the raw materials for preparing the green ultrahigh-performance concrete by using the construction wastes are generally ordinary portland cement (P.I 52.5), waste aerated concrete blocks, quartz sand, steel fibers, a polycarboxylic acid high-performance water reducing agent and the like according to the mass ratio, and the preparation method comprises the following steps:
s1: feeding the waste aerated concrete blocks into a middle crusher for crushing to obtain waste aerated concrete block aggregates; feeding the crushed waste aerated concrete blocks into a horizontal ball mill for grinding to obtain waste aerated concrete powder;
s2: separating the waste aerated concrete powder in the step S1 through a liquid phase grinding system to obtain quartz sand and waste aerated concrete powder slurry;
s3: feeding the waste aerated concrete powder slurry separated in the step S2 into a vertical ball mill for wet grinding to obtain micron-grade and nano-micron-grade waste aerated concrete powder slurry;
s4: uniformly mixing and stirring 600 parts by mass of the solid waste aerated block aggregate obtained in the step S1, 200 parts by mass of the waste aerated concrete powder, 25-45 parts by mass of the nano-micron waste aerated concrete powder slurry obtained in the step S3 and 90 parts by mass of the micron waste aerated concrete powder slurry (the nano-micron powder slurry accounts for 10% of the gelled material), 450 parts by mass of cement 250-type and 400 parts by mass of quartz sand 300-type into a stirrer, continuously stirring, sequentially adding 225 parts by mass of water 125-type, 4-7 parts by mass of a polycarboxylic acid high-performance water reducer and 50-80 parts by mass of copper-plated steel fibers, and stirring and molding to obtain green ultrahigh-performance concrete;
control group 0-0
Uniformly mixing and stirring 600 parts by mass of solid waste aerated block aggregate, 200 parts by mass of waste aerated concrete powder, 25-45 parts by mass of micron-sized waste aerated concrete powder slurry (nano-micron powder slurry accounts for 0 percent of gelled material), 450 parts by mass of cement and 300 parts by mass of quartz sand, sending the mixture into a stirrer for continuous stirring, sequentially adding 225 parts by mass of water, 4-7 parts by mass of polycarboxylic acid high-performance water reducer and 50-80 parts by mass of copper-plated steel fiber, and stirring and molding to obtain green ultrahigh-performance concrete;
the mechanical property test is carried out by manufacturing a standard test block according to GB/T50081-2002 Standard of mechanical property test methods of common concrete, and measuring the compressive strength of the standard test block maintained for 28 d; the 28d compressive strength test refers to the basic performance and test method of the ultra-high performance concrete of China building materials Association standard T/CBMF 37-2018.
Table 1: performance testing
As can be seen from table 1, as the mixing amount of the nano-micron waste aerated powder slurry increases, the density gradually increases, and the fluidity of the concrete decreases, because the nano-micron slurry fills the tiny pores in the concrete, the compactness of the concrete is improved; along with the increase of the mixing amount, the compressive strength of the concrete 28 is in a rising trend, and the strength is improved by 112 percent to the maximum; as the doping amount of the nano-micron slurry increases, the shrinkage strain of the nano-micron slurry tends to increase, and the electric flux tends to decrease. In conclusion, the method for preparing the green ultra-high performance concrete by using the construction waste meets the Chinese standard, and provides a new way for green recycling of the construction waste.
From fig. 1, it can be obviously observed that the pores of the waste aerated concrete are obviously reduced, and the wet-milled nano waste aerated concrete has better filling effect, so that the porosity of the concrete is reduced, and the compressive strength of the waste aerated ultra-high performance concrete is improved.
As shown in fig. 2, as the mixing amount of the nano-micron waste aerated concrete is increased, the strength of 1d is increased and then decreased compared with the strength of a control group, which is caused by the negative effect of the water reducing agent, the strengths of 7d and 28d are increased compared with the strength of the control group, the negative effect of the water reducing agent disappears, and the nuclear effect and the filling effect generated by the nano-micron waste aerated concrete promote the strength increase of the waste aerated concrete. As the mixing amount of the nano-micron slurry in the examples 1 to 5 is increased, the 28d compressive strength is in an increased state and is consistent with the result that the pore volume of the wet-milled nano-micron waste aerated slurry is reduced in an SEM picture, and the result proves that the all-component waste aerated block can be used for preparing the ultra-high performance concrete.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for preparing green ultra-high performance concrete by utilizing construction waste in all components is characterized by comprising the following steps: the method comprises the following steps:
s1: feeding the solid massive construction waste into a middle crusher for crushing to obtain solid construction waste aggregate; then feeding the solid construction waste aggregate into a horizontal ball mill for grinding to obtain solid construction waste powder;
s2: separating the solid construction waste powder in the step S1 through a liquid phase grinding system to obtain a siliceous raw material and solid construction waste powder slurry;
s3: feeding the solid construction waste powder slurry obtained by separation in the step S2 into a vertical ball mill for wet grinding, and controlling the grinding time to obtain micron-grade and nano-micron-grade solid construction waste powder slurry;
s4: and (3) uniformly mixing and stirring the solid construction waste aggregate and the solid construction waste powder in the step S1, the siliceous raw material in the step S2, the micron-sized and nano-micron-sized solid massive construction waste powder slurry obtained in the step S3, the siliceous raw material powder and the cement in proportion, feeding the mixture into a stirrer for continuous stirring, sequentially adding water, a polycarboxylic acid high-performance water reducer and copper-plated steel fibers, and stirring and forming to obtain the green ultrahigh-performance concrete prepared by utilizing the construction waste in all components.
2. The method for preparing green ultra-high performance concrete by using construction waste in full components according to claim 1, which is characterized in that:
in the step S1, the solid massive construction waste is waste aerated concrete blocks, the solid construction waste aggregate is waste aerated concrete block aggregate, and the solid construction waste powder is waste aerated concrete powder; the waste aerated concrete block mainly comprises cement, fly ash, gypsum and quartz sand;
in the step S2, the siliceous raw material is quartz sand, and the solid construction waste powder slurry is waste aerated concrete powder slurry.
3. The method for preparing green ultra-high performance concrete by using the construction waste in full components according to claim 1 or 2, which is characterized in that: in the step S3, the waste aerated concrete powder slurry with the solid content of 45% is subjected to wet grinding to obtain micron-sized and nano-micron-sized waste aerated powder slurries.
4. The method for preparing green ultra-high performance concrete by using the construction waste in full components according to claim 1 or 2, which is characterized in that: in the step S1 and the step S3, the crusher is a jaw crusher, the feed particle size is less than 50cm, and the liquid phase grinding system is a linear concrete sand-stone separator;
in the step S1, the capacity of the jaw ball mill is 50-120t/h, and the grinding time of the jaw ball mill is 30-60 min;
the working time of the linear concrete sand-stone separator in the step S2 is 8-10 min;
the rotating speed of the vertical ball mill in the step S3 is 400 rad/min.
5. The method for preparing green ultra-high performance concrete by using construction waste in full components according to claim 3, which is characterized in that: in the step S1 and the step S3, the crusher is a jaw crusher, the feed particle size is less than 50cm, and the liquid phase grinding system is a linear concrete sand-stone separator;
in the step S1, the capacity of the jaw ball mill is 50-120t/h, and the grinding time of the jaw ball mill is 30-60 min;
the working time of the linear concrete sand-stone separator in the step S2 is 8-10 min;
the rotating speed of the vertical ball mill in the step S3 is 400 rad/min.
6. The method for preparing green ultra-high performance concrete by using the full components of the construction waste according to the claim 1, 2 or 5, is characterized in that: the specific process of step S4 is as follows:
pre-stirring portland cement, micron-grade and nano-micron-grade waste aerated powder slurry for 2min, adding solid construction waste aggregate and solid construction waste powder, and stirring for 1 min; adding a mixture of water and the polycarboxylic acid high-performance water reducing agent twice during stirring; continuously stirring the concrete slurry, then uniformly adding the steel fibers, and stirring for 8min to obtain the green ultrahigh-performance concrete prepared from the construction waste in full components;
the nano-micron waste aerated concrete powder slurry is mainly used as a green ultra-high performance concrete superfine admixture, so that the internal curing performance of waste aerated concrete is improved;
the total amount of the polycarboxylic acid high-performance water reducing agent accounts for 0.4-0.7% of the cementing material.
7. The method for preparing green ultra-high performance concrete by using the construction waste in full components according to claim 6, which is characterized in that: in the step S4, the solid construction waste powder replaces quartz sand, and the nano-micron waste aerated powder slurry replaces part of silica fume, so that the use amount of the silica fume is reduced, and the production cost of the concrete is reduced; the waste aerated block powder slurry with the particle size of 10-14 mu m is obtained by controlling the wet grinding time, and the micron-sized waste aerated block powder slurry is used for replacing cement, so that the full-component utilization of building wastes for preparing green ultrahigh-performance concrete is promoted; the waste aerated concrete building garbage is treated to reach different particle sizes, and is filled at different levels, so that the compactness of concrete is improved, and a closest packing model is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110347761.4A CN113087465B (en) | 2021-03-31 | 2021-03-31 | Method for preparing green ultrahigh-performance concrete by using construction waste in full component manner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110347761.4A CN113087465B (en) | 2021-03-31 | 2021-03-31 | Method for preparing green ultrahigh-performance concrete by using construction waste in full component manner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113087465A true CN113087465A (en) | 2021-07-09 |
| CN113087465B CN113087465B (en) | 2023-03-10 |
Family
ID=76671648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110347761.4A Active CN113087465B (en) | 2021-03-31 | 2021-03-31 | Method for preparing green ultrahigh-performance concrete by using construction waste in full component manner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113087465B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860807A (en) * | 2021-10-22 | 2021-12-31 | 山东居欢新型材料科技有限公司 | Building material produced by waste autoclaved aerated concrete product |
| CN113999582A (en) * | 2021-11-26 | 2022-02-01 | 甘肃中研同创材料科技有限责任公司 | Water-based building garbage waterproof coating and preparation method thereof |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2837609A1 (en) * | 2013-08-12 | 2015-02-18 | Rigas Tehniska Universitate | Ultra-high performance nano-modified concrete composition with borosilicate glass lamp waste powder |
| CN105384374A (en) * | 2015-09-15 | 2016-03-09 | 上海市建筑科学研究院 | Green compound admixture prepared by using construction waste recycled fine powder |
| WO2016145548A1 (en) * | 2015-03-16 | 2016-09-22 | 清华大学 | Self-compacting concrete prepared from industrial solid waste and preparation method therefor |
| WO2017082747A1 (en) * | 2015-11-13 | 2017-05-18 | Instituto Superior Técnico | High-performance concrete made with no natural aggregates and its preparation |
| CN107226643A (en) * | 2017-05-03 | 2017-10-03 | 武汉理工大学 | Regenerative pervious concrete material that a kind of full constituent is prepared using building waste and preparation method thereof |
| CN107954656A (en) * | 2017-11-01 | 2018-04-24 | 同济大学 | A kind of regenerative micro powder concrete with superelevation ductility and preparation method thereof |
| CN109293311A (en) * | 2018-11-07 | 2019-02-01 | 广东工业大学 | Ultra-high performance concrete slurry, ultra-high performance concrete and preparation method thereof |
| CN109584973A (en) * | 2018-11-22 | 2019-04-05 | 中安瑞宝建设集团有限公司 | A kind of building castoff powder base ecotype ultra-high performance concrete designs and prepares method |
| CN109836097A (en) * | 2019-02-27 | 2019-06-04 | 湖南大学 | A kind of ecotype ultra-high performance concrete |
| CN110627426A (en) * | 2019-10-29 | 2019-12-31 | 湖北工业大学 | Preparation method of green ultrahigh-performance concrete |
| AU2020101096A4 (en) * | 2020-06-23 | 2020-07-23 | Qian’an Weisheng Solid Waste Environmental Protection Industrial co., LTD | The Preparation Method of Steel Fiber Reinforced Ultra-high Performance Concrete by Synergistic Utilization of Multi-solid Waste |
| CN112174591A (en) * | 2020-08-26 | 2021-01-05 | 北京鼎创科技环保集团有限公司 | Production of ultra-high performance concrete by using construction waste micropowder |
| CN112430036A (en) * | 2020-11-30 | 2021-03-02 | 湖北工业大学 | In-situ preparation method of cementing material for offshore area infrastructure |
-
2021
- 2021-03-31 CN CN202110347761.4A patent/CN113087465B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2837609A1 (en) * | 2013-08-12 | 2015-02-18 | Rigas Tehniska Universitate | Ultra-high performance nano-modified concrete composition with borosilicate glass lamp waste powder |
| WO2016145548A1 (en) * | 2015-03-16 | 2016-09-22 | 清华大学 | Self-compacting concrete prepared from industrial solid waste and preparation method therefor |
| CN105384374A (en) * | 2015-09-15 | 2016-03-09 | 上海市建筑科学研究院 | Green compound admixture prepared by using construction waste recycled fine powder |
| WO2017082747A1 (en) * | 2015-11-13 | 2017-05-18 | Instituto Superior Técnico | High-performance concrete made with no natural aggregates and its preparation |
| CN107226643A (en) * | 2017-05-03 | 2017-10-03 | 武汉理工大学 | Regenerative pervious concrete material that a kind of full constituent is prepared using building waste and preparation method thereof |
| CN107954656A (en) * | 2017-11-01 | 2018-04-24 | 同济大学 | A kind of regenerative micro powder concrete with superelevation ductility and preparation method thereof |
| CN109293311A (en) * | 2018-11-07 | 2019-02-01 | 广东工业大学 | Ultra-high performance concrete slurry, ultra-high performance concrete and preparation method thereof |
| CN109584973A (en) * | 2018-11-22 | 2019-04-05 | 中安瑞宝建设集团有限公司 | A kind of building castoff powder base ecotype ultra-high performance concrete designs and prepares method |
| CN109836097A (en) * | 2019-02-27 | 2019-06-04 | 湖南大学 | A kind of ecotype ultra-high performance concrete |
| CN110627426A (en) * | 2019-10-29 | 2019-12-31 | 湖北工业大学 | Preparation method of green ultrahigh-performance concrete |
| AU2020101096A4 (en) * | 2020-06-23 | 2020-07-23 | Qian’an Weisheng Solid Waste Environmental Protection Industrial co., LTD | The Preparation Method of Steel Fiber Reinforced Ultra-high Performance Concrete by Synergistic Utilization of Multi-solid Waste |
| CN112174591A (en) * | 2020-08-26 | 2021-01-05 | 北京鼎创科技环保集团有限公司 | Production of ultra-high performance concrete by using construction waste micropowder |
| CN112430036A (en) * | 2020-11-30 | 2021-03-02 | 湖北工业大学 | In-situ preparation method of cementing material for offshore area infrastructure |
Non-Patent Citations (2)
| Title |
|---|
| 李道松: ""基于再生回收废料设计生态型超高性能"", 《福建建材》 * |
| 杨进等: ""Eco-friendly UHPC prepared from high volume wet-grinded ultrafine GGBS slurry"", 《CONSTRUCTION AND BUILDING MATERIALS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860807A (en) * | 2021-10-22 | 2021-12-31 | 山东居欢新型材料科技有限公司 | Building material produced by waste autoclaved aerated concrete product |
| CN113999582A (en) * | 2021-11-26 | 2022-02-01 | 甘肃中研同创材料科技有限责任公司 | Water-based building garbage waterproof coating and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113087465B (en) | 2023-03-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2020101154A4 (en) | A Cementitious Material, A Concrete Prepared And Its Preparation Method | |
| CN102992722B (en) | Ultrahigh-strength grouting material based on iron tailing sand and cement and preparation method of grouting material | |
| CN110526628B (en) | Preparation method of high-doping-amount wet-grinding phosphorus-solid waste super-retarding cementing material | |
| CN110627426B (en) | Preparation method of green ultrahigh-performance concrete | |
| CN112125584B (en) | Preparation method of low-hydration-heat green self-leveling concrete | |
| CN103159450B (en) | Production method of foamed concrete block manufactured from steel slag | |
| CN108623196A (en) | A kind of lime excitation large dosage industrial residue low-carbon cement and preparation method thereof | |
| CN113087465B (en) | Method for preparing green ultrahigh-performance concrete by using construction waste in full component manner | |
| CN111116142B (en) | Ecological concrete prepared from building waste soil sintered micro powder and preparation method of concrete product thereof | |
| CN108546009B (en) | CaCO doped with multi-scale particle size3High performance concrete slurry admixture | |
| CN113880506A (en) | Geopolymer cementing material prepared by exciting magnesium-nickel-rich slag with phosphoric acid and preparation method thereof | |
| CN112159176A (en) | Wear-resistant self-leveling cement mortar doped with waste glass and preparation method thereof | |
| CN110590294A (en) | Regenerated powder concrete with good durability and preparation method thereof | |
| CN112194405B (en) | Preparation method and application of carbide slag super-early-strength additive | |
| CN112079583A (en) | Building material product based on rapid carbonization of regenerated cementing material and preparation method thereof | |
| CN111848053A (en) | Fly ash-based nano-micron crystal nucleus additive suitable for concrete prefabricated part and preparation method and application thereof | |
| CN112608043A (en) | High-strength nickel slag-based solid waste cementing material and preparation method thereof | |
| CN112125543B (en) | Composite gel material prepared from bulk solid wastes and preparation method thereof | |
| CN109437766A (en) | A kind of Reactive Powder Concrete suitable for road and bridge engineering | |
| CN114315184A (en) | Ultra-fine admixture for solid waste based composite lithium slag and preparation method and application thereof | |
| CN114195461A (en) | Molybdenum tailing active powder concrete archaized brick and preparation method thereof | |
| CN106478018A (en) | A kind of ecological environment-friendly type nano cement based composites | |
| JP6165447B2 (en) | Method for producing concrete with reduced bleeding | |
| CN109384433A (en) | Low-heat damages use in concrete member cementitious material | |
| CN112209641B (en) | Method for preparing cement by using waste sintered shale |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |