CN113461355A - High-performance concrete capable of recycling waste solids and preparation method thereof - Google Patents
High-performance concrete capable of recycling waste solids and preparation method thereof Download PDFInfo
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- CN113461355A CN113461355A CN202110981531.3A CN202110981531A CN113461355A CN 113461355 A CN113461355 A CN 113461355A CN 202110981531 A CN202110981531 A CN 202110981531A CN 113461355 A CN113461355 A CN 113461355A
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- concrete
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1074—Silicates, e.g. glass
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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
- 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
- C04B18/18—Waste materials; Refuse organic
- C04B18/20—Waste materials; Refuse organic from macromolecular compounds
- C04B18/22—Rubber, e.g. ground waste tires
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- 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
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a high-performance concrete for recycling waste solids and a preparation method thereof, wherein the high-performance concrete for recycling the waste solids is produced by reprocessing materials mainly recycled by waste tires and waste plastics, removing impurities in the materials, carrying out corresponding surface treatment, and carrying out fusion stirring with the concrete; the invention improves the durability and the crack resistance of the concrete, when cracks are generated, because the tips of the cracks extend to the rubber particles, the deformation capability of the rubber particles dissipates the stress at the tips of the cracks, delays the further extension of the cracks, and shows more excellent residual strength and fracture energy than the common concrete by adding the recycled polypropylene fibers.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to high-performance concrete capable of recycling waste solids and a preparation method thereof.
Background
The production amount of waste tires, waste plastics and the like in life is huge, the waste tires and the waste plastics are generally buried in a burying mode, but the burying of the waste tires and the plastics pollutes the environment in the burying process, the burying places are gradually reduced, the utilization rate of concrete is low, in addition, the utilization rate of the waste tires and the waste plastics is low, a small amount of rubber concrete is added with a rubber material in the concrete preparation process, the concrete has certain ductility compared with the traditional concrete, but the rubber concrete has not high rubber utilization rate, and the performance increase of the concrete is limited, so that the high-performance concrete for recycling waste solids and the preparation method thereof are provided.
Disclosure of Invention
The invention aims to solve the defects of low data processing speed, low utilization rate of waste plastics and poor new energy of concrete in the prior art, and provides high-performance concrete for recycling waste solids and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-performance concrete for recycling the waste solids comprises the following raw materials: 14% of cement, 23% of fine aggregate, 54% of coarse aggregate, 5% of water, 0.2% of water reducing agent and 3.8% of additive, wherein the proportion of polypropylene fiber additive material in the fine aggregate is 10% -15%, and the proportion of rubber particles in the coarse aggregate is 10% -20%.
The preparation method of the high-performance concrete with the recycled waste solids comprises the following steps:
step 2, removing metal substances, cleaning and removing impurities;
step 3, cutting up the rubber material, granulating, using the cut-up rubber material as aggregate, and processing the waste material into a fiber polypropylene fiber additive material;
step 4, further cleaning, removing impurities, and soaking the rubber aggregate and the sodium salt solution;
step 5, cleaning and air-drying the rubber aggregate, mixing the rubber aggregate with concrete, and adding a polypropylene fiber material;
and 6, detecting the mixed concrete material, and comparing data.
Preferably, the addition amount of the polypropylene fiber additive material in the step 3 is 0.5%, which can remarkably improve the toughness after cracking and better control the cracks.
Preferably, the rubber substitution amount of the rubber still shows excellent mechanical strength, good bending resistance, crack resistance and durability when reaching 15 percent.
Preferably, the rubber aggregate is soaked in a sodium silicate solution (water glass) for 20 minutes before concrete mixing, and then is cleaned and dried, so that the hydrophobicity and the microstructure of the surface of the rubber aggregate are changed.
Preferably, according to the step 6, when the high-performance concrete is prepared and detected, the main detection workability, the compressive strength, the tensile strength, the fracture energy and the resistivity are obtained.
Preferably, metal substances such as steel wires and the like in the waste tires are removed in the process of recycling, and untreated clean fine metal particles are adsorbed by magnetic separation in the processes of cutting and granulating rubber particles.
Compared with the prior art, the invention has the beneficial effects that:
1. the method effectively recycles the waste tires, has large production amount of the waste tires in life, small utilization rate and large occupied farmland, causes great harm to fragile ecological environment, recycles and recycles the waste tires and waste plastics, reduces pollution to the environment, realizes high-valued solid waste resources, and assists the nation to realize the aim of carbon neutralization;
2. according to the invention, the waste tires are recycled to prepare the rubber particles, and the rubber particles are compounded with the polypropylene and the concrete to prepare the environment-friendly high-performance concrete, so that the cost is saved, the utilization of solid waste resources is improved, and the influence on the environment is reduced;
3. compared with the traditional concrete, the concrete greatly improves the durability, frost resistance and fracture resistance of the concrete, particularly greatly reduces the tip stress of the crack due to the good elastic property of the rubber particles when the crack is generated and the tip of the crack expands to the rubber particles, prevents the crack from further extending, shows more excellent crack expansion resistance than the common concrete by adding the polypropylene fiber, greatly improves the ductility and fracture resistance, and avoids the brittle failure of the structure.
Drawings
FIG. 1 is a basic flow chart of the waste solid recycled high-performance concrete and the preparation method thereof;
FIG. 2 is a graph showing the comparison between the density of fresh concrete and the quality of concrete after adding fiber and rubber in the high-performance concrete recycled from waste solids and the preparation method thereof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, a method for preparing high-performance concrete by recycling waste solids includes the following steps:
the preparation method of the high-performance concrete with the recycled waste solids comprises the following steps:
step 2, removing metal substances, cleaning and removing impurities;
step 3, cutting up the rubber material, granulating, using the cut-up rubber material as aggregate, and processing the waste material into polypropylene fiber additive material;
step 4, further cleaning, removing impurities, and soaking the rubber aggregate and the sodium salt solution;
step 5, cleaning and air-drying the rubber aggregate, mixing the rubber aggregate with fresh concrete, adding a polypropylene fiber material, and uniformly dispersing;
and 6, detecting the mixed concrete material, and comparing data.
The high-performance concrete for recycling the waste solids comprises the following raw materials: 14% of cement, 23% of fine aggregate, 54% of coarse aggregate, 5% of water, 0.2% of water reducing agent and 3.8% of additive, wherein the proportion of polypropylene fiber additive material in the fine aggregate is 10% -15%, and the proportion of rubber particles in the coarse aggregate is 10% -20%.
The high-performance concrete is produced by reprocessing materials mainly including waste tires and waste plastics, removing impurities in the materials, and blending the materials with concrete to produce the high-performance concrete, wherein the high-performance concrete is prepared by adding a polypropylene fiber material into the high-performance concrete by taking a rubber particle material as an aggregate according to a certain proportion, and the high-performance concrete improves the frost resistance, the strength and the durability of the concrete and reduces cracks of the concrete.
Two kinds of high-performance concrete which are prepared by recycling waste solids with different rubber volume contents are 10% and 15% respectively. A consistent amount of fiber (volume fraction 0.5%) was incorporated. Plain concrete test pieces were prepared simultaneously for comparison with test pieces containing only polypropylene (PP) fibers. The mechanical test result shows that: the breaking energy of the plain concrete can be improved by the addition of the PP fiber and the rubber aggregate. In addition, all test pieces reach the compressive strength of more than 40Mpa, and the ultrasonic pulse speed shows that the quality of the concrete test piece is good. The appearance of the fracture surface of the test piece and the imaging of an Environmental Scanning Electron Microscope (ESEM) show that the rubber aggregate and the PP fiber have positive synergistic effect on inhibiting crack propagation. The PP fiber reinforced rubber concrete improves the residual bearing capacity and the deformation capacity of the concrete after the crack is developed, thereby improving the overall fracture toughness and reducing the brittleness.
The durability performance test result shows that: compared with plain concrete, the PP fiber reinforced rubber concrete also reduces the shrinkage rate and alkali-aggregate reaction (ASR) expansion rate of the test piece. The PP fiber reinforced rubber concrete improves the freeze-thaw cycle resistance, the relative dynamic elastic modulus of the PP fiber reinforced rubber concrete is still kept above 95% after undergoing hundreds of freeze-thaw cycles, and the PP fiber reinforced rubber concrete shows good volume stability.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The high-performance concrete for recycling the waste solids is characterized by comprising the following raw materials: 14% of cement, 23% of fine aggregate, 54% of coarse aggregate, 5% of water, 0.2% of water reducing agent and 3.8% of additive, wherein the proportion of polypropylene fiber additive material in the fine aggregate is 10% -15%, and the proportion of rubber particles in the coarse aggregate is 10% -20%.
2. The preparation method of the high-performance concrete capable of recycling the waste solids is characterized by comprising the following steps of:
step 1, recovering waste solids, waste tires and waste plastics;
step 2, extracting metal objects such as steel wires and the like in the tire, cleaning and removing impurities;
step 3, cutting and screening the tire rubber according to the required particle size, and processing the waste materials into fiber polypropylene fiber additive materials as aggregates;
step 4, further cleaning, removing impurities, and soaking the rubber aggregate and the sodium salt solution;
step 5, cleaning and air-drying the rubber aggregate, mixing the rubber aggregate with fresh concrete, and uniformly adding a polypropylene fiber material to disperse the polypropylene fiber material;
and 6, detecting the mixed concrete material, and comparing data.
3. The method for preparing high-performance concrete by recycling waste solids according to claim 2, wherein the polypropylene fiber additive in step 3 is added in an amount of 0.5% of the total volume of the concrete, so as to significantly improve the toughness after cracking and better control the cracks.
4. The method for preparing high-performance concrete by recycling waste solids according to claim 2, wherein the rubber substitution amount is up to two 15% of the total concrete aggregate, and the high-performance concrete still has excellent mechanical strength, good bending resistance, crack resistance and durability.
5. The method for preparing high-performance concrete by recycling waste solids according to claim 2, wherein the rubber aggregate is soaked in sodium salt solution for 20 minutes before the concrete is mixed, and then is washed and dried to change the hydrophobicity of the rubber mark points.
6. The method for preparing high-performance concrete by recycling waste solids according to claim 2, wherein freshness, compression resistance, tensile strength, fracture sample and resistivity are mainly measured when the high-performance concrete is prepared and tested according to the step 6 in claim 1.
7. The method for preparing high-performance concrete by recycling waste solids according to claim 2, wherein metal substances such as hubs in the waste tires are removed during the recycling process, and fine metal particles are adsorbed by magnets during the cutting and granulating processes of rubber particles.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110981531.3A CN113461355A (en) | 2021-08-25 | 2021-08-25 | High-performance concrete capable of recycling waste solids and preparation method thereof |
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| CN202110981531.3A CN113461355A (en) | 2021-08-25 | 2021-08-25 | High-performance concrete capable of recycling waste solids and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018909A (en) * | 2021-11-08 | 2022-02-08 | 河海大学 | Test bar for rapidly detecting chloride ions in sewage and preparation method and application thereof |
| CN115403329A (en) * | 2022-08-16 | 2022-11-29 | 东至丰达混凝土有限公司 | Concrete based on solid waste recycling and preparation method thereof |
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2021
- 2021-08-25 CN CN202110981531.3A patent/CN113461355A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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