CN110790547A - Light high-strength concrete doped with recycled aggregate, machine-made sand and stone powder - Google Patents
Light high-strength concrete doped with recycled aggregate, machine-made sand and stone powder Download PDFInfo
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- CN110790547A CN110790547A CN201911084803.9A CN201911084803A CN110790547A CN 110790547 A CN110790547 A CN 110790547A CN 201911084803 A CN201911084803 A CN 201911084803A CN 110790547 A CN110790547 A CN 110790547A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight 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
- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a light high-strength concrete doped with recycled aggregate, machine-made sand and stone powder, which comprises 350-450 parts of cement, 200-500 parts of recycled aggregate, 500-700 parts of machine-made sand, 100-400 parts of stone powder, 5-15 parts of a water reducing agent, 100-300 parts of a reinforcing agent and 100-200 parts of water, wherein the grain diameter of the machine-made sand is less than 2.5mm, the content of the stone powder is 16-17%, and the apparent density is 2-3 g/cm3The porosity is 28% -29%, and the fineness modulus is 2-2.5; the particle size of the recycled aggregate is less than 25mm, and the apparent density is 2400-2500 kg/m3The bulk density is 1500-1600 kg/m3The porosity is 50% -52%, and the water absorption is 4% -4.5%; meanwhile, the invention also provides a preparation method and application of the light high-strength concrete. By selecting proper machine-made sand, recycled aggregate and stone powder and scientifically proportioning, the concrete has two incompatible performances of low density and high strength, and the density is as low as 1829-2058 kg/m3And the compressive strength can reach 78.9-85.6 MPa.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to light high-strength concrete doped with recycled aggregate, machine-made sand and stone powder.
Background
With the rapid development of economy and the acceleration of urbanized construction process in China, billions of tons of natural aggregates collected for pouring concrete are consumed every year, and a large amount of construction waste is generated by dismantling old buildings, so that a series of problems of resource exhaustion, environmental pollution, energy consumption and the like are caused. In order to alleviate the contradiction, the aggregate made by crushing and screening the waste concrete in the construction waste is called recycled aggregate. The recycled concrete generated by the recycled aggregate through a series of treatments can not only improve the disaster prevention capability of the structure, but also make full use of the waste aggregate; the method can protect the ecological environment of the concrete aggregate producing area, solve the problems of land occupation and environmental pollution caused by stacking urban waste, and has obvious economic, social and environmental benefits, thereby having wide application prospect.
In recent years, high-speed rails and highways are built in the areas of the Chinese and western parts of China, such as Yunnan, Guizhou, Guangxi, Chongqing and the like, but in the infrastructure construction of the areas, because natural sand resources are extremely scarce, environmental protection limits exploitation and other reasons, the natural sand is expensive and not beneficial to ecological construction, and the preparation of concrete by using the machine-made sand instead of the natural sand is imperative.
However, the quality and quality of the machine-made sand in various regions are different at present, the gradation and the grain shape of the prepared machine-made sand are poor, the content of the stone powder is high, and the repeatability of the working performance and the mechanical performance of the prepared concrete is poor, so that the popularization and the use of the concrete are influenced.
Disclosure of Invention
The invention aims to provide light high-strength concrete doped with recycled aggregate, machine-made sand and stone powder, wherein the density of the concrete is 1829-2058 kg/m3The compressive strength can reach 78.9-85.6 MPa, and the density of the concrete can be reduced under the condition of keeping high strength.
The raw materials of the light high-strength concrete doped with the recycled aggregate, the machine-made sand and the stone powder comprise the following components in parts by mass:
the grain size of the machine-made sand is less than 2.5mm, the content of stone powder is 16-17%, and the apparent density is 2-3 g/cm3The porosity is 28% -29%, and the fineness modulus is 2-2.5. In a more preferred embodiment, the machine-made sand has a particle size of < 2.5mm, a stone dust content of 16.4%, and an apparent density of 2.685g/cm3The porosity was 28.9%, and the fineness modulus was 2.3.
Preferably, the particle size of the recycled aggregate is less than 25mm, and the apparent density is 2400-2500 kg/m3The bulk density is 1500-1600 kg/m3The porosity is 50-52%, and the water absorption is 4-4.5%. More preferably, the recycled aggregate has a particle size of < 25mm and an apparent density of 2460kg/m3Bulk density of 1570kg/m3The porosity was 50.7%, and the water absorption was 4.2%.
In a preferred embodiment, the particle size of the stone powder is less than 1.35mm, the non-uniformity coefficient is 1-1.5, and the curvature coefficient is 0.5-0.8. More preferably, the particle size of the stone powder is less than 1.35mm, the uneven coefficient is 1.36, and the curvature coefficient is 0.74.
In a preferred embodiment, the water reducing agent has a solid content of less than or equal to 20% and a relative density of 1-1.2 g/cm3The water reducing rate is 30-35%. More preferably, the water reducing agent has a solid content of 20% and a relative density of 1.05g/cm3The water reduction rate is 35%.
In a preferred embodiment, the water reducer comprises at least one of an aliphatic high range water reducer, an amino high range water reducer, and a polycarboxylic acid high range water reducer.
In a preferred embodiment, the enhancer comprises 8-13% of diethylene glycol, 3-6% of glycerol, 2-6% of triethanolamine and 2-4% of anhydrous sodium sulfite by mass.
In a preferred embodiment, the cement is a P.O 52.5R and above grade cement.
In a preferred embodiment, the raw materials of the lightweight high-strength concrete doped with the recycled aggregate, the machine-made sand and the stone powder comprise the following components in parts by mass:
the preparation method of the light high-strength concrete doped with the recycled aggregate, the machine-made sand and the stone powder, provided by the invention, comprises the following steps:
(1) uniformly mixing cement, recycled aggregate and machine-made sand to obtain a sand material;
(2) mixing the stone powder, the water reducing agent and the reinforcing agent uniformly, adding the sand material, adding water and stirring uniformly to obtain the water-based paint.
The invention also provides application of the light high-strength concrete doped with the recycled aggregate, the machine-made sand and the stone powder in preparation of well covers, sandwich components or port rock walls.
The inventor researches the performance of concrete and finds that the mechanical strength and the density of the concrete are in positive correlation generally, namely, the mechanical strength of the concrete is correspondingly enhanced along with the increase of the density of the concrete. The density of the concrete is influenced by the performance of the raw materials, generally, the lower the density of the raw materials is, the lower the porosity is, the more dense the concrete is, and the higher the mechanical strength is; on the contrary, if the density of the raw materials is high and the porosity is high, the gap in the concrete structure is increased, so that the density of the concrete is reduced, and the mechanical strength is reduced.
However, the inventor simultaneously researches the performances of raw materials such as the machine-made sand, the recycled aggregate, the stone powder and the like, and finds that the properties of the machine-made sand, such as the particle size, the stone powder content, the density, the porosity, the fineness modulus and the like, have influence on the positive correlation between the density and the mechanical strength of the concrete, the particle size of the machine-made sand is less than 2.5mm, the stone powder content is 16-17%, and the apparent density is 2-3 g/cm3Under the conditions that the porosity is 28% -29% and the fineness modulus is 2-2.5, hydration reaction products of the machine-made sand, cement and water have high chemical bond strength in molecules and sufficient bonding strength among the molecules, so that the concrete has high mechanical strength; meanwhile, the concrete has more pores inside, so that the concrete has very low density. In addition, the inventors have also found that recycled aggregates also have a similar effect when used in the production of a recycled aggregateThe recycled aggregate has the grain diameter of less than 25mm and the apparent density of 2400-2500 kg/m3The bulk density is 1500-1600 kg/m3The concrete has high strength and low density when the porosity is 50-52% and the water absorption is 4-4.5%. The performance of raw materials such as stone powder, a water reducing agent, a reinforcing agent and the like is further optimized, and the mechanical property and the density of the concrete can be finely adjusted.
Therefore, the concrete prepared by selecting the proper machine-made sand, the recycled aggregate, the stone powder, the water reducing agent and the reinforcing agent and scientifically proportioning has the following beneficial effects:
(1) the density is low, and the self weight of the structure can be greatly reduced;
(2) the material has good mechanical properties, and is not easy to damage, resist compression, fracture and deformation;
(3) various waste resources can be utilized, the saving and circular economy are met, and the problems of occupied stacking area, environmental pollution and the like of urban waste can be solved;
(4) the preparation method is simple, the raw material source is wide, the operation is convenient, and the production cost is low.
Drawings
FIG. 1 is a flow chart of a preparation method of the present invention;
fig. 2 is a well cover prepared using the concrete of the present invention.
Detailed Description
The technical scheme of the invention is further illustrated by the following specific examples.
The raw materials of the light high-strength concrete doped with the recycled aggregate, the machine-made sand and the stone powder comprise the following components in parts by mass: 350-450 parts of cement, 200-500 parts of recycled aggregate, 500-700 parts of machine-made sand, 100-400 parts of stone powder, 5-15 parts of water reducing agent, 100-300 parts of reinforcing agent and 100-200 parts of water.
Wherein the grain diameter of the machine-made sand is less than 2.5mm, the content of the stone powder is 16-17 percent, and the apparent density is 2-3 g/cm3The porosity is 28% -29%, and the fineness modulus is 2-2.5; the recycled aggregate is formed by crushing and screening waste concrete in construction waste, the particle size of the recycled aggregate is less than 25mm, and the apparent density is 2400-2500kg/m3The bulk density is 1500-1600 kg/m3The porosity is 50% -52%, and the water absorption is 4% -4.5%; the particle size of the stone powder is less than 1.35mm, the nonuniform coefficient is 1-1.5, and the curvature coefficient is 0.5-0.8. The solid content of the water reducing agent is less than or equal to 20 percent, and the relative density is 1-1.2 g/cm3The water reducing rate is 30-35%, and one or more of aliphatic high-efficiency water reducing agent, amino high-efficiency water reducing agent and polycarboxylic acid high-performance water reducing agent can be selected; the reinforcing agent comprises 8-13% of diglycol, 3-6% of glycerol, 2-6% of triethanolamine and 2-4% of anhydrous sodium sulfite by mass.
The preparation method is shown in a flow chart of figure 1 and comprises the following steps:
(1) firstly, mixing and metering according to the mixture ratio shown in tables 1-3, then uniformly stirring the stone powder and the recycled aggregate, adding machine-made sand, and uniformly stirring to obtain the sand material.
(2) And in addition, uniformly mixing the powdery water reducing agent and the reinforcing agent, adding the sand material, uniformly mixing and stirring, and simultaneously adding water and stirring until the mixture is viscous and fluid to obtain the concrete.
For comparison, the same preparation method was used to prepare corresponding ordinary concrete according to the raw materials and the mixture ratio shown in table 3.
TABLE 1 concrete raw material proportions of examples 1 and 2
TABLE 2 concrete raw material ratios of examples 3 and 4
TABLE 3 raw material proportions of examples 5 and 6 and general concrete
For 100mm prepared as described above3The high-strength concrete test block is subjected to 28d density and compressive strength performance test, and the test method comprises the following steps:
(1) and (3) testing the density: calculating the volume V according to the prepared test block; placing the prepared test block on a high-precision electronic scale, and measuring the mass m of the test block; the density is calculated from the measured mass and volume.
(2) And (3) testing the compressive strength: calculating the stress sectional area A of the test block to be accurate to 1 mm; the side surface of the test block is taken as an upper pressure surface and a lower pressure surface, and the center of the test block is centered with the geometric center of the press; when the test block is close to damage and begins to deform, stopping the accelerator of the testing machine until the test block is damaged, and recording the damage limit load F (N)'; the strength was calculated from the measured ultimate load and the sectional area.
The test results are shown in table 4.
TABLE 4 concrete test block Density and compressive Strength
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Ordinary concrete | |
| Density (kg/m)3) | 2138 | 1829 | 1938 | 2058 | 2100 | 2079 | 2425 |
| Compressive strength (MPa) | 62.6 | 78.9 | 83.8 | 85.6 | 74.2 | 40.6 | 35.7 |
As can be seen from Table 4, in the raw materials of examples 1 to 5, the densities of the machine-made sand and the recycled aggregate are gradually increased, but the densities of the concrete are not correspondingly increased and do not show monotonous positive correlation or negative correlation; meanwhile, the compressive strength of the concrete is not in monotonous positive correlation with the density.
In examples 2 to 4, the machine-made sand had a particle size of less than 2.5mm, a content of stone powder of 16 to 17% and an apparent density of 2 to 3g/cm3The porosity is 28-29%, the fineness modulus is 2-2.5, and the recycled aggregate also has similar effects, the particle size of the recycled aggregate is less than 25mm, and the apparent density is 2400-2500 kg/m3The bulk density is 1500-1600 kg/m3The density of the concrete is 1829-2058 kg/m when the porosity is 50-52 percent and the water absorption is 4-4.5 percent3The density of the concrete is 2425 kg/m compared with that of the common concrete3Small; meanwhile, the 28d compressive strength is over 78.9MPa and can reach 85.6MPa at most, and compared with the common concrete, the concrete has higher strengthThe purpose of reducing the self weight and the pressure resistance of the structure can be achieved. Meanwhile, in the embodiment 6, although the density of the concrete without the recycled aggregate is similar to that of the embodiments 2 to 4, the strength of the concrete is only 35.7MPa, which is far inferior to the compressive strength of the embodiments 2 to 4; however, its density is lower than that of ordinary concrete, and its compressive strength is higher.
Experiments prove that the concrete has two performances of high strength and low density which are difficult to be obtained simultaneously by scientifically selecting the machine-made sand, the recycled aggregate and other raw materials. After the viscous fluid concrete is prepared, it can be cast into a mold to prepare building materials requiring high strength and low density performance, such as well covers (as shown in fig. 2), sandwich members, harbor rock walls, and the like.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. The light high-strength concrete doped with the recycled aggregate, the machine-made sand and the stone powder is characterized in that: the paint comprises the following components in parts by mass:
the grain size of the machine-made sand is less than 2.5mm, the content of stone powder in the machine-made sand is 16-17%, and the apparent density is 2-3 g/cm3The porosity is 28% -29%, and the fineness modulus is 2-2.5.
2. The lightweight high-strength concrete doped with recycled aggregate, machine-made sand and stone powder according to claim 1, which is characterized in that: the particle size of the recycled aggregate is less than 25mm, and the apparent density is 2400-2500 kg/m3The bulk density is 1500-1600 kg/m3The porosity is 50-52%, and the water absorption is 4-4.5%.
3. The lightweight high-strength concrete doped with recycled aggregate, machine-made sand and stone powder according to claim 2, characterized in that: the particle size of the stone powder is less than 1.35mm, the nonuniform coefficient is 1-1.5, and the curvature coefficient is 0.5-0.8.
4. The lightweight high-strength concrete doped with recycled aggregate, machine-made sand and stone powder according to claim 1, which is characterized in that: the solid content of the water reducing agent is less than or equal to 20 percent, and the relative density is 1-1.2 g/cm3The water reducing rate is 30-35%.
5. The lightweight high-strength concrete doped with recycled aggregate, machine-made sand and stone powder according to claim 4, which is characterized in that: the water reducing agent comprises at least one of an aliphatic high-efficiency water reducing agent, an amino high-efficiency water reducing agent and a polycarboxylic acid high-performance water reducing agent.
6. The lightweight high-strength concrete doped with recycled aggregate, machine-made sand and stone powder according to claim 1, which is characterized in that: the reinforcing agent comprises 8-13% of diglycol, 3-6% of glycerol, 2-6% of triethanolamine and 2-4% of anhydrous sodium sulfite by mass.
7. The lightweight high-strength concrete doped with recycled aggregate, machine-made sand and stone powder according to claim 1, which is characterized in that: the cement comprises P.O 52.5R or above grade cement.
8. A preparation method of light high-strength concrete doped with recycled aggregate, machine-made sand and stone powder is characterized by comprising the following steps: the raw material of the light high-strength concrete with the recycled aggregate, the machine-made sand and the stone powder mixed in the machine-made sand is as defined in any one of claims 1 to 7, and comprises the following steps:
(1) uniformly mixing cement, recycled aggregate and machine-made sand to obtain a sand material;
(2) mixing the stone powder, the water reducing agent and the reinforcing agent uniformly, adding the sand material, adding water and stirring uniformly to obtain the water-based paint.
9. The use of the lightweight high-strength concrete doped with recycled aggregate, machine-made sand or stone powder according to any one of claims 1 to 7 in the preparation of well covers, sandwich members or port rock walls.
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| CN113004009A (en) * | 2021-04-24 | 2021-06-22 | 上海石化安东混凝土有限公司 | Environment-friendly high-strength concrete and preparation method thereof |
| CN113638604A (en) * | 2021-08-05 | 2021-11-12 | 广州市艺杰园林建设工程有限公司 | Safe construction method for long-life garden ecological stone wall |
| CN114477861A (en) * | 2020-10-27 | 2022-05-13 | 成都岷江混凝土有限公司 | Light recycled concrete and preparation method thereof |
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| CN113638604A (en) * | 2021-08-05 | 2021-11-12 | 广州市艺杰园林建设工程有限公司 | Safe construction method for long-life garden ecological stone wall |
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