CN111574134B - Environment-friendly green concrete - Google Patents
Environment-friendly green concrete Download PDFInfo
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- CN111574134B CN111574134B CN202010586711.7A CN202010586711A CN111574134B CN 111574134 B CN111574134 B CN 111574134B CN 202010586711 A CN202010586711 A CN 202010586711A CN 111574134 B CN111574134 B CN 111574134B
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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
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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
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides environment-friendly green concrete which is prepared from the following raw materials in parts by weight: 142-157 parts of cement, 84-121 parts of pretreated fly ash, 58-75 parts of slag powder, 665-790 parts of medium sand, 952-1185 parts of broken stone, 112-147 parts of water, 3.22-3.37 parts of a water reducing agent and 0.87-1.03 part of an air entraining agent. The concrete has high strength performance and fracture toughness, so that the concrete has excellent frost resistance under the low-temperature working condition.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to environment-friendly green concrete.
Background
The infrastructure of China is in a vigorous development stage, the demand of concrete is huge, and the green design and construction of concrete are of unprecedented importance. In order to avoid repeated construction, the durability of the environment-friendly green concrete is the key, and the durability can be achieved only when the environment adaptability is high.
Disclosure of Invention
Aiming at the defects or shortcomings in the prior art, the invention provides environment-friendly green concrete.
In order to achieve the purpose, the technical scheme adopted by the invention is to provide environment-friendly green concrete which is prepared from the following raw materials in parts by weight: 142-157 parts of cement, 84-121 parts of pretreated fly ash, 58-75 parts of slag powder, 665-790 parts of medium sand, 952-1185 parts of broken stone, 112-147 parts of water, 3.22-3.37 parts of a water reducing agent and 0.87-1.03 part of an air entraining agent.
As a further improvement of the invention, the feed additive comprises the following raw materials in parts by weight: 146 parts of cement, 87 parts of pretreated fly ash, 62 parts of slag powder, 671 parts of medium sand, 1012 parts of crushed stone, 135 parts of water, 3.31 parts of water reducing agent and 0.95 part of air entraining agent.
As a further improvement of the invention, the feed additive comprises the following raw materials in parts by weight: 152 parts of cement, 92 parts of pretreated fly ash, 68 parts of slag powder, 772 parts of medium sand, 996 parts of broken stone, 124 parts of water, 2.33 parts of water reducing agent and 0.88 part of air entraining agent.
As a further improvement of the invention, the crushed stone comprises 189-201 parts of recycled aggregate with the grain diameter of 4-8 mm, 567-655 parts of medium crushed stone with the grain diameter of 10-20 mm and 188-220 parts of coarse crushed stone with the grain diameter of 16-31.5 mm.
As a further improvement of the invention, the recycled aggregate is prepared by adding modified grafted TPF, aluminum oxide and silicon carbide into crushed waste concrete, uniformly mixing, pouring into a tank mill, mixing and grinding for 6-7 h, injecting into a high-temperature furnace, performing heat treatment at 986 ℃ for 6h, 1125 ℃ for 3h, 1366 ℃ for 4h and 1485 ℃ for 4h, injecting into a mold, keeping the temperature for 3h, demolding, cooling to 155 ℃ and granulating to obtain 4-8 mm aggregate, maintaining for 3d under the environment with the humidity of 65%, and then baking for 30h at 115 ℃ to obtain the recycled aggregate.
As a further improvement of the invention, the pretreatment fly ash is prepared by firstly taking cheap and easily-obtained fly ash as a raw material, compounding the fly ash with calcium oxide, ferric chloride, magnesium chloride and sodium hypochlorite, then putting the mixture into a hydrogen peroxide solution for mixing reaction, and carrying out suction filtration, washing and drying on the mixture.
As a further improvement of the invention, the pretreated fly ash is obtained by sequentially weighing 68-85 parts of fly ash, 25-26 parts of calcium suboxide, 25-32 parts of ferric chloride, 15-20 parts of magnesium chloride and 35-45 parts of sodium hypochlorite, adding the weighed materials into a device containing 8-12L of hydrogen peroxide solution, carrying out ultrasonic oscillation reaction at the temperature of 63-70 ℃ for 26-35 min at 986-1200 Hz, filtering and drying filter residues.
The invention has the beneficial effects that:
1. in the invention, the fly ash is pretreated, so that the strength performance and the fracture toughness of the concrete are improved, and the concrete has excellent frost resistance under the low-temperature working condition.
2. The recycled aggregate is added into crushed stone, and the recycled aggregate of the invention is prepared by adding modified graft TPF, alumina and silicon carbide into crushed waste concrete (preferably crushed into powder) and uniformly mixing, and then recycling and utilizing waste.
3. According to the invention, the modified grafted TPF, the alumina and the silicon carbide are added for modification at high temperature, and the modified grafted TPF, the alumina and the silicon carbide are subjected to mutual fusion reaction at high temperature, so that the performances of the environment-friendly green concrete, such as durability, crack resistance and the like, are further enhanced.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The invention relates to environment-friendly green concrete which is prepared from the following raw materials in parts by weight: 142-157 parts of cement, 84-121 parts of pretreated fly ash, 58-75 parts of slag powder, 665-790 parts of medium sand, 952-1185 parts of broken stone, 112-147 parts of water, 3.22-3.37 parts of water reducing agent and 0.87-1.03 part of air entraining agent.
The crushed stone comprises 189-201 parts of recycled aggregate with the particle size of 4-8 mm, 567-655 parts of medium crushed stone with the particle size of 10-20 mm and 188-220 parts of coarse crushed stone with the particle size of 16-31.5 mm.
Furthermore, the recycled aggregate is prepared by adding modified grafted TPF, aluminum oxide and silicon carbide into crushed waste concrete, uniformly mixing, pouring into a tank mill, mixing and grinding for 6-7 h, injecting into a high-temperature furnace, performing heat treatment at 986 ℃ for 6h, 1125 ℃ for 3h, 1366 ℃ for 4h and 1485 ℃ for 4h, injecting into a mold, keeping 1110 ℃ for 3h, demolding, cooling to 155 ℃ for granulation to obtain 4-8 mm aggregate, maintaining for 3d under the environment with the humidity of 65%, and then drying for 30h at 115 ℃ to obtain the recycled aggregate.
Further, the pretreatment fly ash is prepared by firstly taking cheap and easily-obtained fly ash as a raw material, compounding the raw material with calcium oxide, ferric chloride, magnesium chloride and sodium hypochlorite, then putting the mixture into a hydrogen peroxide solution for mixing reaction, and performing suction filtration, washing and drying on the mixture.
Preferably, the pretreated fly ash is obtained by sequentially weighing 68-85 parts of fly ash, 25-26 parts of calcium suboxide, 25-32 parts of ferric chloride, 15-20 parts of magnesium chloride and 35-45 parts of sodium hypochlorite, adding the weighed materials into a device containing 8-12L of hydrogen peroxide solution, carrying out ultrasonic oscillation reaction at the temperature of 63-70 ℃ at 986-1200 Hz for 26-35 min, filtering and drying filter residues.
In the case of the example 1, the following examples are given,
the environment-friendly green concrete is prepared from the following raw materials in parts by weight: 146 parts of cement, 87 parts of pretreated fly ash, 62 parts of slag powder, 671 parts of medium sand, 1012 parts of crushed stone, 135 parts of water, 3.31 parts of water reducing agent and 0.95 part of air entraining agent.
Wherein the water reducing agent is a viscosity reduction type polycarboxylic acid water reducing agent, and the air entraining agent is a rosin air entraining agent.
The crushed stone comprises 194 parts of recycled aggregate with the particle size of 4-8 mm, 623 parts of medium crushed stone with the particle size of 10-20 mm and 193 parts of coarse crushed stone with the particle size of 16-31.5 mm.
The pretreated fly ash is prepared by sequentially weighing 72 parts of fly ash, 25 parts of calcium suboxide, 32 parts of ferric chloride, 15 parts of magnesium chloride and 35 parts of sodium hypochlorite, adding the weighed materials into a device containing 10L of hydrogen peroxide solution, carrying out ultrasonic oscillation reaction at the temperature of 65 ℃ for 30min at 1000Hz, filtering and drying filter residues.
Example 2
The environment-friendly green concrete is prepared from the following raw materials in parts by weight: 152 parts of cement, 92 parts of pretreated fly ash, 68 parts of slag powder, 772 parts of medium sand, 996 parts of broken stone, 124 parts of water, 2.33 parts of water reducing agent and 0.88 part of air entraining agent.
Wherein the water reducing agent is a viscosity reduction type polycarboxylic acid water reducing agent, and the air entraining agent is a rosin air entraining agent.
The crushed stone comprises 198 parts of recycled aggregate with the particle size of 4-8 mm, 576 parts of medium crushed stone with the particle size of 10-20 mm and 211 parts of coarse crushed stone with the particle size of 16-31.5 mm.
The pretreated fly ash is prepared by sequentially weighing 85 parts of fly ash, 26 parts of calcium hypochlorite, 28 parts of ferric chloride, 18 parts of magnesium chloride and 41 parts of sodium hypochlorite, adding into a device containing 9.6L of hydrogen peroxide solution, carrying out ultrasonic oscillation reaction at 68 ℃ at 1125Hz for 33min, filtering, and drying filter residues.
Experimental verification
Two groups of environment-friendly green concrete are prepared by adopting the raw materials of the embodiment 1 and the embodiment 2 according to the same method and are respectively marked as a group A and a group B, each group of concrete is respectively prepared with 10 test blocks which are respectively marked as follows according to the sequence: A1-A10, B1-B10. Preparing reference concrete, and testing slump, expansion and apparent density of the recycled coarse aggregate concrete according to the standard of the performance test method of common concrete mixtures (GB/T50080); testing the mechanical property of the recycled coarse aggregate concrete according to a method in the standard of ordinary concrete mechanical property test methods (GB/T50081); carrying out abrasion loss index test on the recycled coarse aggregate concrete according to the abrasion resistance test method of concrete and products thereof (GB 16925); testing the chlorine ion penetration resistance of the recycled coarse aggregate concrete according to an NEL method; the thermal conductivity, water reduction rate, crack loss resistance, etc. of A1-A10 and B1-B10 were recorded as shown in Table 3: the properties of the environmentally friendly green concrete were tested to obtain the following tables 1-3:
table 1: performance of A group environment-friendly green concrete
Table 2: performance of B group environment-friendly green concrete
Table 3: performances of group A and group B environment-friendly green concrete
As can be seen from the data in tables 1 to 3, the concrete prepared by the invention has greater advantages in compression resistance, chloride ion permeation resistance and water resistance than standard concrete (the standard concrete prepared by replacing natural coarse aggregate with construction waste recycled coarse aggregate by 20 percent and preparing the natural coarse aggregate), and the environmental-friendly green concrete has good performances.
The invention carries on the preconditioning to the fly ash, it is raw materials that it is cheap to be apt at first, through compounding with calcium oxide, ferric chloride, magnesium chloride and sodium hypochlorite, put into hydrogen peroxide solution to mix and react, after filtering, washing and drying, get said preconditioning fly ash, reuse mineral powder, cement, etc. to prepare the mixed emulsion, mix with fine sand, rubble, etc. according to the proportion, get the environment-friendly green concrete through stiring. The invention utilizes the mixed emulsion to be dehydrated and attached to the surfaces of the concrete and the activated rubber powder in the concrete, the fly ash, ferric chloride, magnesium chloride and sodium hypochlorite are compounded and then put into the hydrogen peroxide solution for reaction in a mixed reaction to generate precipitates, the adhesive property of the single fly ash is improved and activated, the bonding strength and the compatibility with the concrete are higher, and after the fly ash, the ferric chloride, the magnesium chloride and the sodium hypochlorite are dissolved in hydrogen peroxide, the solution is acidic due to the existence of the hydrogen peroxide, the ferric chloride and the sodium hypochlorite further react to generate precipitates, the magnesium chloride reacts in the acidic solution to generate a sticky film layer, and the sticky film layer further contains and is in fusion adhesion with the fly ash to form a continuous film structure, so that the strength performance and the fracture toughness of the concrete are improved, and the concrete has excellent frost resistance under the low-temperature working condition.
The recycled aggregate of the invention is prepared by adding modified graft TPF, alumina and silicon carbide into crushed waste concrete (preferably crushed into powder) and uniformly mixing, on one hand, the waste is recycled and utilized, on the other hand, the modified graft TPF, the alumina and the silicon carbide are added for modification at high temperature, the modified graft TPF, the alumina and the silicon carbide are mutually fused and reacted at high temperature to generate a modified polymer which is mutually crosslinked in a laminated manner, and in the modification process, the metal oxide, the alumina and the silicon carbide of the recycled concrete are subjected to limited reaction to generate more stable oxide, and as new oxide is generated, the volume density is increased, and simultaneously, the volume is shrunk, so that the internal pores are also increased, and the generated polymer has pores which are tightly and wrongly distributed, thus being beneficial to the inflow of the modified graft TPF, thereby enhancing the ductility, the flexibility and the high temperature resistance of the recycled aggregate, and further enhancing the performances of crack resistance, durability and the like of the environment-friendly green concrete. The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (3)
1. The environment-friendly green concrete is characterized by comprising the following raw materials in parts by weight: 142-157 parts of cement, 84-121 parts of pretreated fly ash, 58-75 parts of slag powder, 665-790 parts of medium sand, 952-1185 parts of broken stone, 112-147 parts of water, 2.33-3.37 parts of water reducing agent and 0.87-1.03 part of air entraining agent;
the pretreatment fly ash is prepared by sequentially weighing 68-85 parts of fly ash, 25-26 parts of calcium oxide, 25-32 parts of ferric chloride, 15-20 parts of magnesium chloride and 35-45 parts of sodium hypochlorite, adding the weighed materials into a device containing 8-12L of hydrogen peroxide solution, carrying out ultrasonic oscillation reaction at the temperature of 63-70 ℃ for 26-35 min at the frequency of 986-1200 Hz, filtering and drying filter residues;
the crushed stone comprises 189-201 parts of recycled aggregate with the particle size of 4-8 mm, 567-655 parts of medium crushed stone with the particle size of 10-20 mm and 188-220 parts of coarse crushed stone with the particle size of 16-31.5 mm;
the recycled aggregate is prepared by adding modified grafted TPF, aluminum oxide and silicon carbide into crushed waste concrete, uniformly mixing, pouring into a tank mill, mixing and grinding for 6-7 h, injecting into a high-temperature furnace, performing heat treatment at 986 ℃ for 6h, 1125 ℃ for 3h, 1366 ℃ for 4h and 1485 ℃ for 4h, injecting into a mold, keeping 1110 ℃ for 3h, demolding, cooling to 155 ℃, granulating to obtain 4-8 mm aggregate, maintaining for 3d under the environment with the humidity of 65%, and then drying at 115 ℃ for 30 h.
2. The environment-friendly green concrete according to claim 1, which is prepared from the following raw materials in parts by weight: 146 parts of cement, 87 parts of pretreated fly ash, 62 parts of slag powder, 671 parts of medium sand, 1012 parts of crushed stone, 135 parts of water, 3.31 parts of water reducing agent and 0.95 part of air entraining agent.
3. The environment-friendly green concrete according to claim 1, which is prepared from the following raw materials in parts by weight: 152 parts of cement, 92 parts of pretreated fly ash, 68 parts of slag powder, 772 parts of medium sand, 996 parts of broken stone, 124 parts of water, 2.33 parts of water reducing agent and 0.88 part of air entraining agent.
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| CN102557561A (en) * | 2011-11-23 | 2012-07-11 | 淄博乾耀固结材料有限公司 | High-performance sand-soil consolidation material, as well as preparation method and using method thereof |
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