CN115353359A - Concrete recycled aggregate and preparation method thereof - Google Patents
Concrete recycled aggregate and preparation method thereof Download PDFInfo
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- CN115353359A CN115353359A CN202210754878.9A CN202210754878A CN115353359A CN 115353359 A CN115353359 A CN 115353359A CN 202210754878 A CN202210754878 A CN 202210754878A CN 115353359 A CN115353359 A CN 115353359A
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- 239000004567 concrete Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title description 4
- 239000002994 raw material Substances 0.000 claims abstract description 103
- 239000002245 particle Substances 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 15
- 239000011707 mineral Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 239000011449 brick Substances 0.000 claims abstract description 14
- 239000000919 ceramic Substances 0.000 claims abstract description 13
- 239000011521 glass Substances 0.000 claims abstract description 13
- 239000010438 granite Substances 0.000 claims abstract description 13
- 239000010440 gypsum Substances 0.000 claims abstract description 13
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- 238000004140 cleaning Methods 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- 239000011261 inert gas Substances 0.000 claims description 16
- 235000010755 mineral Nutrition 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 238000012216 screening Methods 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- 238000007605 air drying Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000005496 tempering Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000000889 atomisation Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 9
- 238000010304 firing Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 13
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- C04B28/14—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 calcium sulfate 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
- 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)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a concrete recycled aggregate, wherein the particle size of the recycled aggregate is 5-20mm, and the bulk density is 800-1200kg/m 3 (ii) a The raw materials are proportioned as follows according to weight kg: the raw materials comprise 24-30kg of cement, 12-20kg of mineral powder, 7-14kg of fly ash, 2-6kg of steel slag, 6-12kg of granite, 6-14kg of gypsum, 4-8kg of broken bricks, such as 3-6kg of shale, 2-6.5kg of ceramic and 1.5-3kg of regenerated glass. The invention can fully utilize more renewable waste materials for processing, effectively save resources, and prepare the high-strength recycled aggregate with the quality superior to that of the existing concrete aggregate by firing.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a concrete recycled aggregate and a preparation method thereof.
Background
Along with the development of urbanization process, the discharge amount of construction waste is increased year by year, and the proportion of renewable components is also continuously improved. However, most of the construction waste is not treated at all and is transported to the suburbs or the periphery of cities for simple landfill or open-air stockpiling, which not only wastes land and resources, but also pollutes the environment; on the other hand, with the increasing population, the demand of sandstone aggregate for the construction industry is increasing. For a long time, as the sandstone aggregate is widely and easily available in source and low in price, the sandstone aggregate is regarded as an inexhaustible raw material and is randomly exploited, so that the resource is exhausted, the landslide and the riverbed diversion are caused, and the natural environment is seriously damaged. The production and utilization of the construction waste recycled aggregate have important significance for saving resources, protecting the environment and realizing the sustainable development of the construction industry. Aggregates prepared from waste concrete are called recycled concrete aggregates (referred to as recycled aggregates for short). The recycled aggregate prepared only by simple crushing and screening processes has more edges and corners, rough surface, and also contains hardened cement mortar in components, and in addition, a large amount of microcracks are caused in the interior due to damage accumulation in the crushing process of concrete blocks, so that the recycled aggregate has high porosity, high water absorption, small stacking density, high porosity and high crushing index. The recycled concrete prepared by the recycled aggregate has large water content, low strength after hardening, low elastic modulus, and lower durability such as impermeability, frost resistance, carbonization resistance, shrinkage, creep, chloride ion permeability resistance and the like than common concrete. Because the quality difference of the waste concrete is large, the performance difference of the recycled aggregate prepared by a simple process is also large, and the popularization and the application of the recycled aggregate are not convenient.
The existing building made of semi-recycled coarse aggregate concrete has the defects of large porosity, high water absorption and low strength, and aiming at the problems, a concrete recycled aggregate and a preparation method thereof are provided.
Disclosure of Invention
In order to solve the technical defects, the invention adopts a modified technical scheme, and provides a concrete recycled aggregate, wherein the particle size of the recycled aggregate is 5-20mm, and the bulk density is 800-1200kg/m 3 (ii) a The raw materials are proportioned as follows according to weight kg: the raw materials comprise 24-30kg of cement, 12-20kg of mineral powder, 7-14kg of fly ash, 2-6kg of steel slag, 6-12kg of granite, 6-14kg of gypsum, 4-8kg of broken bricks, such as 3-6kg of shale, 2-6.5kg of ceramic and 1.5-3kg of regenerated glass.
In a further preferred embodiment of the present invention, the raw materials include 30kg of cement, 20kg of mineral powder, 14kg of fly ash, 6kg of steel slag, 12kg of granite, 14kg of gypsum, 8kg of broken bricks, such as 6kg of shale, 6.5kg of ceramic and 3kg of recycled glass.
As a further preferable mode of the invention, the raw materials comprise 24kg of cement, 12kg of mineral powder, 7kg of fly ash, 2kg of steel slag, 6-kg of granite, 6kg of gypsum, 4kg of broken brick, such as 3kg of shale, 2kg of ceramic and 1.5kg of recycled glass.
As a further preferred mode of the present invention, there is provided a method comprising the steps of,
s1, weighing raw materials according to a kg weight ratio, cleaning the raw materials by adopting a weak acid mixed solution, filtering impurities by using clear water after cleaning, air-drying or drying the raw materials, and crushing the raw materials, wherein the size of the raw material crushing treatment is controlled to be 1.5-4.5 mm;
s2, feeding the raw materials into a dry ball mill for grinding, adding water after grinding, mixing and passing through a 280-320 mesh screen for later use;
s3, feeding the mixture into a ball forming mill through a belt, controlling the feeding speed through adjusting the belt, atomizing additional water, and spraying the atomized additional water into the ball forming mill, wherein the amount of the additional water is 12% of the total weight of the material, adjusting the inclination angle and the rotation speed of the ball forming mill by adopting a conventional technology to adjust the particle size of raw material balls, automatically overflowing the raw material balls out of the ball forming mill after the particle size of the raw material balls reaches 3-8 mm, and continuously drying at a low temperature, wherein the drying temperature is controlled to be 65-125 ℃;
s4, conveying the dried raw material balls into a kiln through a belt for roasting, firstly, starting a vacuumizing device to vacuumize a tempering furnace before the temperature rises to 800 ℃, and removing air; secondly, filling inert gas into the furnace pipe when the furnace temperature is increased to 1200 ℃, starting a circulating fan to heat and temper, keeping the temperature at 20 ℃/min for increasing in the heating process, keeping the temperature at 800-1000 ℃ for 20min, and keeping the temperature at 1200 ℃ for 45min;
and S5, naturally cooling the manufactured raw materials, and screening by using a multi-stage screening machine after cooling is finished, so that the manufacturing is finished.
As a further preferable mode of the invention, in the step S1, in the cleaning and mixing process, the raw materials are stirred and mixed by utilizing the driving of a motor, the rotating speed is controlled to be 140-260r/min, the time lasts for 30min, and the temperature is controlled to be 85 ℃.
In a further preferred embodiment of the present invention, in step S2, the weak acid solution comprises a mixture of acetic acid, hydrofluoric acid and sodium bicarbonate, wherein the concentration of acetic acid is 0.65mol/L to 0.85mol/L, the concentration of hydrofluoric acid is 0.2mol/L to 0.45mol/L, and the concentration of sodium bicarbonate is 0.15mol/L to 0.35mol/L.
In a further preferred embodiment of the present invention, in step S4, argon is added as an inert gas, and the mixture is uniformly injected in an amount of 250 ml/min.
The invention has the following beneficial effects: the invention can fully utilize more renewable waste materials for processing, effectively save resources, and prepare the high-strength recycled aggregate with the quality superior to that of the existing concrete aggregate by firing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: in a further preferred embodiment of the present invention, the recycled concrete aggregate has a particle size of 5mm to 20mm and a bulk density of 800 to 1200kg/m 3 (ii) a The raw materials are proportioned as follows according to weight kg: the raw materials comprise 24-30kg of cement, 12-20kg of mineral powder, 7-14kg of fly ash, 2-6kg of steel slag, 6-12kg of granite, 6-14kg of gypsum, 4-8kg of broken bricks, such as 3-6kg of shale, 2-6.5kg of ceramic and 1.5-3kg of regenerated glass.
The raw materials comprise 30kg of cement, 20kg of mineral powder, 14kg of fly ash, 6kg of steel slag, 12kg of granite, 14kg of gypsum, 8kg of broken bricks, such as 6kg of shale, 6.5kg of ceramic and 3kg of regenerated glass.
The raw materials comprise 24kg of cement, 12kg of mineral powder, 7kg of fly ash, 2kg of steel slag, 6-kg of granite, 6kg of gypsum, 4kg of broken bricks, such as 3kg of shale, 2kg of ceramic and 1.5kg of regenerated glass.
Comprises the following steps of (a) carrying out,
s1, weighing raw materials according to a kg weight ratio, cleaning the raw materials by adopting a weak acid mixed solution, filtering impurities by using clear water after cleaning, air-drying or drying the raw materials, and crushing the raw materials, wherein the size of the raw material crushing treatment is controlled to be 1.5-4.5 mm;
s2, feeding the raw materials into a dry ball mill for grinding, adding water after grinding, mixing and passing through a 280-320-mesh screen for later use;
s3, feeding the mixture into a ball forming mill through a belt, controlling the feeding speed through adjusting the belt, spraying additional water into the ball forming mill after atomization, wherein the using amount of the additional water is 12% of the total weight of the material, adjusting the inclination angle and the rotating speed of the ball forming mill by adopting a conventional technology to adjust the particle size of raw material balls, automatically overflowing the raw material balls out of the ball forming mill after the particle size of the raw material balls reaches 3-8 mm, and continuously drying at a low temperature, wherein the drying temperature is controlled to be 65-125 ℃;
s4, conveying the dried raw material balls into a kiln through a belt for roasting, firstly, starting a vacuumizing device to vacuumize a tempering furnace before the temperature rises to 800 ℃, and removing air; secondly, filling inert gas into the furnace pipe when the furnace temperature is increased to 1200 ℃, starting a circulating fan to heat and temper, keeping the temperature at 20 ℃/min for increasing in the heating process, keeping the temperature at 800-1000 ℃ for 20min, and keeping the temperature at 1200 ℃ for 45min;
and S5, naturally cooling the manufactured raw materials, and screening by adopting a multi-stage screening machine after cooling is finished, so that the manufacturing is finished.
In the step S1, in the cleaning and mixing process, the raw materials are stirred and mixed by utilizing the driving of a motor, the rotating speed is controlled to be 140-260r/min, the time lasts for 30min, and the temperature is controlled to be 85 ℃.
In the step S2, the weak acid solution comprises a mixed solution of acetic acid, hydrofluoric acid and sodium bicarbonate, wherein the concentration of the acetic acid is 0.65-0.85 mol/L, the concentration of the hydrofluoric acid is 0.2-0.45 mol/L, and the concentration of the sodium bicarbonate is 0.15-0.35 mol/L.
In step S4, the inert gas is argon, the injection amount is 250ml/min, and the inert gas is uniformly injected.
Example 1
The raw materials comprise 30kg of cement, 20kg of mineral powder, 14kg of fly ash, 6kg of steel slag, 12kg of granite, 14kg of gypsum, 8kg of broken bricks, such as 6kg of shale, 6.5kg of ceramic and 3kg of regenerated glass.
Cleaning raw materials by using weak acid mixed liquor, removing impurities on the surfaces of the raw materials in the weak acid cleaning process, improving the purity of the raw materials, stirring and mixing the raw materials by using the driving of a motor in the cleaning and mixing process, controlling the rotating speed at 260r/min for 30min, controlling the temperature at 85 ℃, improving the diffusion and mixing of the raw materials under the effects of the rotating speed and the temperature, filtering the impurities by using clean water after the cleaning process, air-drying or drying the raw materials, crushing the raw materials, and controlling the size of the raw material crushing process to be 4.5mm; the raw materials are put into a dry ball mill for grinding, and water is added for mixing and passing through a 320-mesh screen for later use after grinding; feeding the mixture into a ball forming mill through a belt, controlling the feeding speed by adjusting the belt, atomizing the added water, spraying the atomized water into the ball forming mill, spraying the atomized water in the process of conveying the mixture into the belt, accelerating the rapid fusion of the raw materials, adjusting the inclination angle and the rotation speed of the ball forming mill by adopting the conventional technology to adjust the particle size of the raw material balls, automatically overflowing the raw material balls into the ball forming mill after the raw material balls reach the particle size of 8mm, and continuously drying at low temperature, wherein the drying temperature is controlled at 125 ℃; feeding the dried raw material balls into a kiln through a belt for roasting, firstly, starting a vacuumizing device to vacuumize a tempering furnace before the temperature rises to 800 ℃, heating in vacuum, obtaining high-purity raw materials, and removing air; secondly, filling inert gas into the furnace pipe when the furnace temperature is increased to 1200 ℃, wherein the added inert gas is argon, the addition of the inert gas prevents the raw material from being oxidized, ensures that the raw material is stable and does not have chemical reaction in the heating process, keeps the original chemical property of the raw material, has the injection amount of 250ml/min, uniformly injects the raw material, then starts a circulating fan to heat and temper, keeps the temperature increase at 20 ℃/min in the heating process, lasts for 20min at 1000 ℃, and then keeps the temperature at 1200 ℃ for 45min; and naturally cooling the manufactured raw materials, and screening by adopting a multi-stage screening machine after cooling is finished, thus finishing the manufacturing.
Example 2
The raw materials comprise 24kg of cement, 12kg of mineral powder, 7kg of fly ash, 2kg of steel slag, 6-kg of granite, 6kg of gypsum, 4kg of broken bricks such as 3kg of shale, 2kg of ceramic and 1.5kg of regenerated glass.
Cleaning the raw materials by adopting weak acid mixed liquor, stirring and mixing the raw materials by utilizing the driving of a motor in the cleaning and mixing processes, controlling the rotating speed at 140r/min, lasting for 30min and the temperature at 85 ℃, filtering impurities by using clear water after cleaning, then carrying out air drying or drying treatment on the raw materials, and crushing the raw materials, wherein the size of the raw material crushing treatment is controlled to be 1.5mm; the raw materials are put into a dry ball mill for grinding, and water is added after grinding to be mixed and pass through a 280-mesh screen for standby; the mixture is sent into a granulator through a belt, the feeding speed is controlled by adjusting the belt, the added water is atomized and then sprayed into the granulator, the amount of the added water is 12% of the total weight of the materials, the bonding performance among the regenerated coarse aggregates can be promoted under the action of the added water, the crack resistance of the concrete is improved, the compressive strength of the manufactured concrete is effectively improved, the particle size of raw material balls is adjusted by adjusting the inclination angle and the rotating speed of the granulator by adopting the conventional technology, the raw material balls automatically overflow out of the granulator after reaching the particle size of 3mm, the low-temperature drying is continuously carried out, and the drying temperature is controlled at 65 ℃; feeding the dried raw material balls into a kiln through a belt for roasting, firstly, starting a vacuumizing device to vacuumize a tempering furnace before the temperature rises to 800 ℃, and removing air; secondly, when the furnace temperature is increased to 1200 ℃, filling inert gas into the furnace container, adding argon as the inert gas with the injection amount of 250ml/min, uniformly injecting, continuously and uniformly injecting in the heating process, controlling the pressure in the furnace, facilitating the rapid heating, starting a circulating fan to heat and temper, keeping the temperature at 20 ℃/min for improvement in the heating process, keeping the temperature at 800 ℃ for 20min, and keeping the temperature at 1200 ℃ for 45min; and naturally cooling the manufactured raw materials, and screening by adopting a multi-stage screening machine after cooling is finished, thus finishing the manufacturing.
Example 3
The raw materials comprise 25kg of cement, 16kg of mineral powder, 10kg of fly ash, 4kg of steel slag, 10kg of granite, 12kg of gypsum, 6kg of broken bricks, such as 5kg of shale, 4kg of ceramic and 2kg of regenerated glass.
Cleaning raw materials by adopting weak acid mixed liquor, stirring and mixing the raw materials by utilizing the driving of a motor in the cleaning and mixing process, controlling the rotating speed at 200r/min for 30min, controlling the temperature at 85 ℃, filtering impurities by using clear water after cleaning, then carrying out air drying or drying treatment on the raw materials, crushing the raw materials, controlling the size of the crushing treatment of the raw materials at 3mm, measuring the crushing value by adopting a stone crushing value tester, and adjusting the crushing size according to JGJ52-2006 standard so as to influence the water absorption rate of the recycled aggregate when manufacturing concrete; the raw materials are put into a dry ball mill for grinding, and water is added after grinding to be mixed and pass through a 300-mesh screen for standby; feeding the mixture into a ball forming mill through a belt, controlling the feeding speed by adjusting the belt, atomizing additional water, and spraying the atomized additional water into the ball forming mill, wherein the amount of the additional water is 12% of the total weight of the material, adjusting the inclination angle and the rotating speed of the ball forming mill by adopting the conventional technology to adjust the particle size of the raw material balls, automatically overflowing the raw material balls into the ball forming mill after the raw material balls reach the particle size of 6mm, and continuously drying at a low temperature, wherein the drying temperature is controlled at 100 ℃; feeding the dried raw material balls into a kiln through a belt for roasting, and firstly, starting a vacuumizing device to vacuumize a tempering furnace before the temperature rises to 800 ℃ to remove air; secondly, when the furnace temperature is increased to 1200 ℃, filling inert gas into the furnace pipe, adding argon as the inert gas with the injection amount of 250ml/min, uniformly injecting, starting a circulating fan to heat up and temper, keeping the temperature at 20 ℃/min during the heating process for 20min at 900 ℃, keeping the temperature at 1200 ℃ for 45min, keeping the temperature at the uniform temperature during the heating process for increasing, uniformly heating the raw materials, keeping the high-temperature heating for more than 20min, and forming the raw materials with high hardness; and naturally cooling the manufactured raw materials, and screening by adopting a multi-stage screening machine after cooling is finished, thus finishing the manufacturing.
According to the invention, various wastes are used as raw materials, the recycled coarse aggregate is treated, the prepared recycled coarse aggregate replaces natural aggregate to be utilized for multiple times, the performances of the recycled coarse aggregate with the thickness of 5-20mm prepared in examples 1-3 are studied, and GB/T4111-2013 concrete block
And brick test method, molding with dimensions of 280mm 150mm 100mm, outer wall thickness of 25mm, and rib thickness of 18mm to obtain concrete block.
Concrete blocks manufactured in the first, second and third examples have the following specific parameter tables
| 3d compressive Strength (MPA) | 7d compressive Strength (MPA) | 28d compressive Strength (MPA) | Surface porosity | Water absorption rate | |
| 28.5 | 39.5 | 52.4 | 1.8% | 1.4% | Example one |
| 29.3 | 37.8 | 47.5 | 2.3% | 1.55% | Example two |
| 30.1 | 39.3 | 48.3 | 3.1% | 1.65% | EXAMPLE III |
| 28 | 36.5 | 45.5 | 2.5% | 2% | Prior Art |
The compression resistance of the first embodiment and the third embodiment is better than that of the second embodiment, so that when the amount of the cement, the mineral powder, the fly ash and the steel slag is larger than the lower limit value of the raw materials, the compression strength is improved along with the increase of the amount of the cement, the mineral powder, the fly ash and the steel slag.
The surface porosity and water absorption of the three examples were the greatest, but the compressive strength was superior to that of the second example.
With the upper limit of the raw material limit, the compression strength at 28d is significantly better than that of the second and third examples, and the compression strength at 7d is better than that of the second and third examples.
The extreme value of the raw materials of the second example is lower than that of the first example, and the compressive strength of the second example is slightly poorer than that of the third example at 3 d.
The overall water absorption of the first, second and third examples was less than 2%.
The first embodiment, the second embodiment and the third embodiment are superior to the prior art in compressive strength and have higher strength.
In conclusion, the invention not only realizes the resource utilization of the solid waste, but also greatly improves the compressive strength.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A recycled aggregate for concrete is characterized in that: the recycled aggregate has the particle size of 5-20mm and the bulk density of 800-1200kg/m 3 (ii) a The raw materials are proportioned as follows according to weight kg: the raw materials comprise 24-30kg of cement, 12-20kg of mineral powder, 7-14kg of fly ash, 2-6kg of steel slag, 6-12kg of granite, 6-14kg of gypsum, 4-8kg of broken bricks, such as 3-6kg of shale, 2-6.5kg of ceramic and 1.5-3kg of regenerated glass.
2. The recycled concrete aggregate according to claim 1, which is characterized by comprising the following raw materials in parts by weight: the raw materials comprise 30kg of cement, 20kg of mineral powder, 14kg of fly ash, 6kg of steel slag, 12kg of granite, 14kg of gypsum, 8kg of broken bricks, such as 6kg of shale, 6.5kg of ceramic and 3kg of regenerated glass.
3. The recycled concrete aggregate according to claim 1, which is characterized by comprising the following raw materials in parts by weight: the raw materials comprise 24kg of cement, 12kg of mineral powder, 7kg of fly ash, 2kg of steel slag, 6-kg of granite, 6kg of gypsum, 4kg of broken bricks, such as 3kg of shale, 2kg of ceramic and 1.5kg of regenerated glass.
4. The method for preparing recycled concrete aggregate according to claim 1, comprising the steps of,
s1, weighing raw materials according to a kg weight ratio, cleaning the raw materials by adopting a weak acid mixed solution, filtering impurities by using clear water after cleaning, air-drying or drying the raw materials, and crushing the raw materials, wherein the size of the raw material crushing treatment is controlled to be 1.5-4.5 mm;
s2, feeding the raw materials into a dry ball mill for grinding, adding water after grinding, mixing and passing through a 280-320-mesh screen for later use;
s3, feeding the mixture into a ball forming mill through a belt, controlling the feeding speed through adjusting the belt, spraying additional water into the ball forming mill after atomization, wherein the using amount of the additional water is 12% of the total weight of the material, adjusting the inclination angle and the rotating speed of the ball forming mill by adopting a conventional technology to adjust the particle size of raw material balls, automatically overflowing the raw material balls out of the ball forming mill after the particle size of the raw material balls reaches 3-8 mm, and continuously drying at a low temperature, wherein the drying temperature is controlled to be 65-125 ℃;
s4, conveying the dried raw material balls into a kiln through a belt for roasting, firstly, starting a vacuumizing device to vacuumize a tempering furnace before the temperature rises to 800 ℃, and removing air; secondly, filling inert gas into the furnace pipe when the furnace temperature is increased to 1200 ℃, starting a circulating fan to heat and temper, keeping the temperature at 20 ℃/min for increasing in the heating process, keeping the temperature at 800-1000 ℃ for 20min, and keeping the temperature at 1200 ℃ for 45min;
and S5, naturally cooling the manufactured raw materials, and screening by using a multi-stage screening machine after cooling is finished, so that the manufacturing is finished.
5. The method for preparing recycled aggregate for concrete according to claim 4, wherein in the step S1, the raw materials are stirred and mixed by a motor, the rotating speed is controlled to be 140-260r/min for 30min, and the temperature is controlled to be 85 ℃.
6. The method as claimed in claim 4, wherein in step S2, the weak acid solution comprises a mixture of acetic acid, hydrofluoric acid and sodium bicarbonate, wherein the concentration of acetic acid is 0.65mol/L-0.85mol/L, the concentration of hydrofluoric acid is 0.2mol/L-0.45mol/L, and the concentration of sodium bicarbonate is 0.15mol/L-0.35mol/L.
7. The method for preparing recycled concrete aggregate according to claim 4, wherein the inert gas used in step S4 is argon gas, and the amount of the inert gas is 250ml/min, and the inert gas is uniformly injected.
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| CN117645454A (en) * | 2024-01-29 | 2024-03-05 | 济南大学 | Preparation process of red brick recycled aggregate pervious concrete |
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