CN112266210A - Light high-strength concrete and preparation method and application thereof - Google Patents

Light high-strength concrete and preparation method and application thereof Download PDF

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Publication number
CN112266210A
CN112266210A CN202011144614.9A CN202011144614A CN112266210A CN 112266210 A CN112266210 A CN 112266210A CN 202011144614 A CN202011144614 A CN 202011144614A CN 112266210 A CN112266210 A CN 112266210A
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ceramsite
concrete
parts
shale
strength
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袁龙华
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Hunan Institute of Technology
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Hunan Institute of Technology
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40Porous or lightweight materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20Mortars, concrete or artificial stone characterised by specific physical values for the density
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • C04B2201/52High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]

Abstract

The invention is applicable to the technical field of concrete, and provides light high-strength concrete and a preparation method and application thereof, wherein the light high-strength concrete comprises the following components: cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water; the shale ceramsite comprises fine ceramsite with the size fraction of 0-9.5 mm and coarse ceramsite with the size fraction of 9.5-19 mm; the mass ratio of the fine ceramsite to the coarse ceramsite is (3-7) to (3-7). According to the light high-strength concrete provided by the invention, the shale ceramisite with different grades is reasonably matched as the coarse aggregate, so that the loose porosity of the concrete can be reduced, the working performance of the concrete mixture is improved, and the compressive strength of the concrete is improved.

Description

Light high-strength concrete and preparation method and application thereof
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to light high-strength concrete and a preparation method and application thereof.
Background
Concrete is the most widely used building material throughout the world. With the deep development of modern high-rise buildings and large-span bridges, a series of requirements such as light weight, high strength, heat preservation, heat insulation, environmental protection and the like are put forward on concrete materials, and the light weight and high strength concrete becomes necessary for development.
The aggregate in the light high-strength concrete accounts for about 60 percent of the total weight, and the workability of the concrete mixture and the strength of the concrete can be greatly influenced by the performance of the aggregate. At present, researchers research the influence of the fly ash, the sand rate and the additive on the performance of various aspects of the concrete, but research and research are less carried out on the aspects that the light coarse aggregate influences the workability and the strength of the light high-strength concrete.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a lightweight high-strength concrete, which aims to solve the problems set forth in the background art.
The embodiment of the invention is realized in such a way that the light high-strength concrete comprises the following components in parts by weight: 350-500 parts of cement, 50-70 parts of silica fume, 50-70 parts of fly ash, 50-70 parts of mineral powder, 75-95 parts of river sand, 250-400 parts of ceramic sand, 550-700 parts of shale ceramsite and 100-200 parts of water; the shale ceramsite comprises fine ceramsite with the size fraction of 0-9.5 mm and coarse ceramsite with the size fraction of 9.5-19 mm; the mass ratio of the fine ceramsite to the coarse ceramsite is (3-7) to (3-7).
As a preferable scheme of the embodiment of the invention, the light-weight high-strength concrete comprises the following components in parts by weight: 400-450 parts of cement, 55-65 parts of silica fume, 55-65 parts of fly ash, 55-65 parts of mineral powder, 80-90 parts of river sand, 300-350 parts of ceramic sand, 600-650 parts of shale ceramsite and 130-170 parts of water.
As another preferable scheme of the embodiment of the invention, the mass ratio of the fine ceramsite to the coarse ceramsite is (4-6): 4-6.
Another object of an embodiment of the present invention is to provide a method for preparing the above light-weight high-strength concrete, which includes the following steps:
weighing cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water according to the weight parts of the components;
mixing cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water to obtain a mixture;
adding an additive into the mixture for mixing to obtain a concrete mixture;
and forming and curing the concrete mixture to obtain the light high-strength concrete.
As another preferable scheme of the embodiment of the invention, the admixture is a polycarboxylic acid water reducing agent.
As another preferable scheme of the embodiment of the invention, the addition amount of the additive is 0.5-1.5% of the mass of the mixture.
Another object of the embodiments of the present invention is to provide a lightweight high-strength concrete prepared by the above preparation method.
As another preferable scheme of the embodiment of the invention, the apparent density of the light high-strength concrete is 1750-1850 kg/m3And the 28d compressive strength is 72.1-76.1 MPa.
Another object of the embodiments of the present invention is to provide an application of the above light weight high strength concrete as a building material.
According to the light high-strength concrete provided by the embodiment of the invention, the shale ceramisites with different grades are reasonably matched to serve as the coarse aggregate, so that the loose porosity of the coarse aggregate can be reduced, the working performance of a concrete mixture is improved, and the compressive strength of the concrete is improved.
Drawings
FIG. 1 is a graph showing the comparison of the compressive strength of concrete made from shale ceramisites with different maximum particle sizes.
FIG. 2 is a graph showing the comparison of the compressive strength of concrete containing shale ceramisites with different size fractions.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Example 1
The embodiment provides a light-weight high-strength concrete, and the preparation method comprises the following steps:
s1, weighing 500kg of cement, 50kg of silica fume, 50kg of fly ash, 50kg of mineral powder, 75kg of river sand, 250kg of ceramic sand, 550kg of shale ceramsite and 100kg of water; wherein the cement is P.O42.5 cement sold in the market; the mineral powder is commercially available S95 mineral powder; pulverized coalThe ash is first-grade fly ash sold in the market; as the light fine aggregate, the ceramic sand can adopt commercial continuous-graded common ceramic sand, and the apparent density is 1540kg/m3Fineness modulus is 2.3; the river sand is commercial grade continuous common river sand, and the apparent density of the river sand is 2600kg/m3Fineness modulus is 2.7; the shale ceramsite is used as a coarse aggregate, and can be high-strength broken stone type shale ceramsite produced by Hubei Yichang Bright ceramsite products Limited, which comprises fine ceramsite with the grain size of 0-9.5 mm and coarse ceramsite with the grain size of 9.5-19 mm; wherein the mass ratio of the fine ceramsite to the coarse ceramsite is 3: 7; the apparent density of the shale ceramsite is 1500kg/m3The loose bulk density is 785kg/m3The water absorption rate is 5.8%, the content of mud lumps is 0.5%, and the barrel pressure strength is 6 MPa.
S2, uniformly stirring and mixing the weighed cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water to obtain a mixture.
S3, adding 0.5% of polycarboxylic acid water reducing agent into the mixture, and uniformly mixing to obtain a concrete mixture; and then, forming and curing the concrete mixture to obtain the light high-strength concrete. Wherein the water reducing rate of the polycarboxylic acid water reducing agent is 28 percent.
Example 2
The embodiment provides a light-weight high-strength concrete, and the preparation method comprises the following steps:
s1, weighing 350kg of cement, 70kg of silica fume, 70kg of fly ash, 70kg of mineral powder, 95kg of river sand, 400kg of ceramic sand, 700kg of shale ceramsite and 200kg of water; wherein the cement is P.O42.5 cement sold in the market; the mineral powder is commercially available S95 mineral powder; the fly ash is first-grade fly ash sold in the market; as the light fine aggregate, the ceramic sand can adopt commercial continuous-graded common ceramic sand, and the apparent density is 1540kg/m3Fineness modulus is 2.3; the river sand is commercial grade continuous common river sand, and the apparent density of the river sand is 2600kg/m3Fineness modulus is 2.7; the shale ceramsite is used as a coarse aggregate, and can be high-strength broken stone type shale ceramsite produced by Hubei Yichang Bright ceramsite products Limited, which comprises fine ceramsite with the grain size of 0-9.5 mm and coarse ceramsite with the grain size of 9.5-19 mm; wherein the fine haydite and the coarse haydite areThe mass ratio is 7: 3; the apparent density of the shale ceramsite is 1500kg/m3The loose bulk density is 785kg/m3The water absorption rate is 5.8%, the content of mud lumps is 0.5%, and the barrel pressure strength is 6 MPa.
S2, uniformly stirring and mixing the weighed cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water to obtain a mixture.
S3, adding 1.5% of polycarboxylic acid water reducing agent into the mixture, and uniformly mixing to obtain a concrete mixture; and then, forming and curing the concrete mixture to obtain the light high-strength concrete. Wherein the water reducing rate of the polycarboxylic acid water reducing agent is 28 percent.
Example 3
The embodiment provides a light-weight high-strength concrete, and the preparation method comprises the following steps:
s1, weighing 380kg of cement, 55kg of silica fume, 55kg of fly ash, 55kg of mineral powder, 80kg of river sand, 280kg of ceramic sand, 680kg of shale ceramsite and 120kg of water; wherein the cement is P.O42.5 cement sold in the market; the mineral powder is commercially available S95 mineral powder; the fly ash is first-grade fly ash sold in the market; as the light fine aggregate, the ceramic sand can adopt commercial continuous-graded common ceramic sand, and the apparent density is 1540kg/m3Fineness modulus is 2.3; the river sand is commercial grade continuous common river sand, and the apparent density of the river sand is 2600kg/m3Fineness modulus is 2.7; the shale ceramsite is used as a coarse aggregate, and can be high-strength broken stone type shale ceramsite produced by Hubei Yichang Bright ceramsite products Limited, which comprises fine ceramsite with the grain size of 0-9.5 mm and coarse ceramsite with the grain size of 9.5-19 mm; wherein the mass ratio of the fine ceramsite to the coarse ceramsite is 3.5: 6.5; the apparent density of the shale ceramsite is 1500kg/m3The loose bulk density is 785kg/m3The water absorption rate is 5.8%, the content of mud lumps is 0.5%, and the barrel pressure strength is 6 MPa.
S2, uniformly stirring and mixing the weighed cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water to obtain a mixture.
S3, adding 0.8% of polycarboxylic acid water reducing agent into the mixture, and uniformly mixing to obtain a concrete mixture; and then, forming and curing the concrete mixture to obtain the light high-strength concrete. Wherein the water reducing rate of the polycarboxylic acid water reducing agent is 28 percent.
Example 4
The embodiment provides a light-weight high-strength concrete, and the preparation method comprises the following steps:
s1, weighing 480kg of cement, 60kg of silica fume, 65kg of fly ash, 65kg of mineral powder, 90kg of river sand, 380kg of ceramic sand, 580kg of shale ceramsite and 180kg of water; wherein the cement is P.O42.5 cement sold in the market; the mineral powder is commercially available S95 mineral powder; the fly ash is first-grade fly ash sold in the market; as the light fine aggregate, the ceramic sand can adopt commercial continuous-graded common ceramic sand, and the apparent density is 1540kg/m3Fineness modulus is 2.3; the river sand is commercial grade continuous common river sand, and the apparent density of the river sand is 2600kg/m3Fineness modulus is 2.7; the shale ceramsite is used as a coarse aggregate, and can be high-strength broken stone type shale ceramsite produced by Hubei Yichang Bright ceramsite products Limited, which comprises fine ceramsite with the grain size of 0-9.5 mm and coarse ceramsite with the grain size of 9.5-19 mm; wherein the mass ratio of the fine ceramsite to the coarse ceramsite is 6.5: 3.5; the apparent density of the shale ceramsite is 1500kg/m3The loose bulk density is 785kg/m3The water absorption rate is 5.8%, the content of mud lumps is 0.5%, and the barrel pressure strength is 6 MPa.
S2, uniformly stirring and mixing the weighed cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water to obtain a mixture.
S3, adding 1.2% of polycarboxylic acid water reducing agent into the mixture, and uniformly mixing to obtain a concrete mixture; and then, forming and curing the concrete mixture to obtain the light high-strength concrete. Wherein the water reducing rate of the polycarboxylic acid water reducing agent is 28 percent.
Example 5
The embodiment provides a light-weight high-strength concrete, and the preparation method comprises the following steps:
s1, weighing 400kg of cement, 55kg of silica fume, 55kg of fly ash, 55kg of mineral powder, 80kg of river sand, 300kg of ceramic sand, 650kg of shale ceramsite and 130kg of water; wherein the cement is commercially availableP.o42.5 cement; the mineral powder is commercially available S95 mineral powder; the fly ash is first-grade fly ash sold in the market; as the light fine aggregate, the ceramic sand can adopt commercial continuous-graded common ceramic sand, and the apparent density is 1540kg/m3Fineness modulus is 2.3; the river sand is commercial grade continuous common river sand, and the apparent density of the river sand is 2600kg/m3Fineness modulus is 2.7; the shale ceramsite is used as a coarse aggregate, and can be high-strength broken stone type shale ceramsite produced by Hubei Yichang Bright ceramsite products Limited, which comprises fine ceramsite with the grain size of 0-9.5 mm and coarse ceramsite with the grain size of 9.5-19 mm; wherein the mass ratio of the fine ceramsite to the coarse ceramsite is 4: 6; the apparent density of the shale ceramsite is 1500kg/m3The loose bulk density is 785kg/m3The water absorption rate is 5.8%, the content of mud lumps is 0.5%, and the barrel pressure strength is 6 MPa.
S2, uniformly stirring and mixing the weighed cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water to obtain a mixture.
S3, adding 1% of polycarboxylic acid water reducing agent into the mixture, and uniformly mixing to obtain a concrete mixture; and then, forming and curing the concrete mixture to obtain the light high-strength concrete. Wherein the water reducing rate of the polycarboxylic acid water reducing agent is 28 percent.
Example 6
The embodiment provides a light-weight high-strength concrete, and the preparation method comprises the following steps:
s1, weighing 450kg of cement, 65kg of silica fume, 65kg of fly ash, 65kg of mineral powder, 90kg of river sand, 350kg of ceramic sand, 600kg of shale ceramsite and 170kg of water; wherein the cement is P.O42.5 cement sold in the market; the mineral powder is commercially available S95 mineral powder; the fly ash is first-grade fly ash sold in the market; as the light fine aggregate, the ceramic sand can adopt commercial continuous-graded common ceramic sand, and the apparent density is 1540kg/m3Fineness modulus is 2.3; the river sand is commercial grade continuous common river sand, and the apparent density of the river sand is 2600kg/m3Fineness modulus is 2.7; the shale ceramsite is used as coarse aggregate, and can be high-strength broken stone type shale ceramsite produced by Hubei Yichang Bright ceramsite products Limited, which comprises fine ceramsite with the grain size of 0-9.5 mm and fine ceramsite with the grain size of 9.5E19mm of coarse ceramic grains; wherein the mass ratio of the fine ceramsite to the coarse ceramsite is 6: 4; the apparent density of the shale ceramsite is 1500kg/m3The loose bulk density is 785kg/m3The water absorption rate is 5.8%, the content of mud lumps is 0.5%, and the barrel pressure strength is 6 MPa.
S2, uniformly stirring and mixing the weighed cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water to obtain a mixture.
S3, adding 1% of polycarboxylic acid water reducing agent into the mixture, and uniformly mixing to obtain a concrete mixture; and then, forming and curing the concrete mixture to obtain the light high-strength concrete. Wherein the water reducing rate of the polycarboxylic acid water reducing agent is 28 percent.
Example 7
The embodiment provides a light-weight high-strength concrete, and the preparation method comprises the following steps:
s1, weighing 420kg of cement, 60kg of silica fume, 60kg of fly ash, 60kg of mineral powder, 84kg of river sand, 336kg of ceramic sand, 620kg of shale ceramsite and 150kg of water; wherein the cement is P.O42.5 cement sold in the market; the mineral powder is commercially available S95 mineral powder; the fly ash is first-grade fly ash sold in the market; as the light fine aggregate, the ceramic sand can adopt commercial continuous-graded common ceramic sand, and the apparent density is 1540kg/m3Fineness modulus is 2.3; the river sand is commercial grade continuous common river sand, and the apparent density of the river sand is 2600kg/m3Fineness modulus is 2.7; the shale ceramsite is used as a coarse aggregate, and can be high-strength broken stone type shale ceramsite produced by Hubei Yichang Bright ceramsite products Limited, which comprises fine ceramsite with the grain size of 0-9.5 mm and coarse ceramsite with the grain size of 9.5-19 mm; wherein the mass ratio of the fine ceramsite to the coarse ceramsite is 5: 5; the apparent density of the shale ceramsite is 1500kg/m3The loose bulk density is 785kg/m3The water absorption rate is 5.8%, the content of mud lumps is 0.5%, and the barrel pressure strength is 6 MPa.
S2, uniformly stirring and mixing the weighed cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water to obtain a mixture.
S3, adding 1% of polycarboxylic acid water reducing agent into the mixture, and uniformly mixing to obtain a concrete mixture; and then, forming and curing the concrete mixture to obtain the light high-strength concrete. Wherein the water reducing rate of the polycarboxylic acid water reducing agent is 28 percent.
Example 8
This example provides a lightweight high-strength concrete, which is different from example 7 only in that the shale ceramisite used has a mass ratio of fine ceramisite to coarse ceramisite of 3: 7.
Example 9
This example provides a lightweight high-strength concrete, which is different from example 7 only in that the shale ceramisite is used in which the mass ratio of the fine ceramisite to the coarse ceramisite is 4: 6.
Example 10
This example provides a lightweight high-strength concrete, which is different from example 7 only in that the shale ceramisite is used in which the mass ratio of the fine ceramisite to the coarse ceramisite is 6: 4.
Example 11
This example provides a lightweight high-strength concrete, which is different from example 7 only in that the mass ratio of the fine ceramsite to the coarse ceramsite in the shale ceramsite used is 7: 3.
Experimental example:
firstly, on the basis of example 7, the influence of the shale ceramisite on the working performance and compressive strength of concrete is researched by changing the maximum particle size of the shale ceramisite. The test results are shown in tables 1 and 2 and FIG. 1:
TABLE 1 working Properties of concrete mixtures of different maximum particle diameters
As can be seen from Table 1, the working performance of the concrete mixture is reduced with the reduction of the maximum particle size of the shale ceramisite, and when the maximum particle size of the ceramisite is less than 4.75mm, the fluidity of the concrete mixture is poor and no slump is produced. The working performance of the concrete mixture is close to that of the shale ceramsite with the maximum particle size of 19.0mm and 16.0mm, on one hand, the shale ceramsite with the maximum particle size of 16.0-19.0mm is selected and contains less components, on the other hand, the difference between the specific surface areas of the shale ceramsite with the maximum particle size of 16.0-19.0mm is smaller and is only 15.8%, and the quantity of cement slurry used for wrapping the shale ceramsite is also close to that of the shale ceramsite, so that the working performance of the concrete mixture is not greatly different. When the maximum particle size of the shale ceramsite is less than 16.0mm, the working performance of the concrete mixture is greatly reduced, and the actual construction operation is greatly influenced, mainly because the specific surface area of the ceramsite is multiplied and increased by 68.5%, 100% and 101.3% along with the reduction of the maximum particle size of the ceramsite, the ceramsite can absorb more water due to the increase of the specific surface area, the water consumption for mixing is not increased, so that sufficient water is not provided for a cementing material to be mixed and dispersed, and the working performance of the concrete mixture is obviously reduced. When the maximum grain diameter of the ceramsite is less than 4.75mm, the concrete mixture basically loses the working performance, the main reason is that the specific surface area of the ceramsite is too large, the quantity of cement slurry is seriously insufficient under the test mixing ratio condition, and the concrete mixture is difficult to mix and form. If the requirement on the working performance is met, the dosage of the cementing material can be properly increased.
TABLE 2 compression Strength of concrete of different maximum particle diameters
As shown in the experiment results of the table 2 and the attached figure 1, the compressive strength is increased with the decrease of the maximum particle size of the shale ceramsite, but the increase is not significant and is only increased by about 2%. The main reason is that with the reduction of the maximum grain size of the shale ceramisite, the gelled material is easier to fill the gaps between the aggregates, and the microcracks in the transition area of the interface between the gelled material slurry and the aggregates in the concrete are reduced, so that the compressive strength is increased, but the reduction range is limited, and the transition area cannot be changed from quantitative change to qualitative change. When the maximum grain diameter of the shale ceramsite is less than 9.5mm, the compressive strength is reduced. The main reason is that the specific surface area of the aggregate is multiplied with the reduction of the maximum particle size, the ceramsite absorbs more water, the mixing water consumption is not increased, so that enough water is not provided for the binding material to be stirred and fully hydrated, and the hardened concrete contains more unhydrated cement particles, so that the compressive strength is reduced.
Secondly, the concrete working performance and the compressive strength of the light high-strength concrete provided by the embodiments 7 to 11 are respectively tested, and the test results are shown in tables 3 and 4 and fig. 2.
TABLE 3 compression Strength of concrete with different size fraction component ratios
According to the experimental results shown in Table 3, as the size fraction of the shale ceramisite is reduced from 9.5mm to 19.0mm, the slump of the concrete mixture is increased and then reduced, and the development trend of the loose porosity of the shale ceramisite is approximately opposite, mainly because the lower the loose porosity of the ceramisite is, the better the working performance of the concrete mixture is. When the grain size of 0-9.5 mm and 9.5-19.0 mm is 1:1, the loose porosity of the shale ceramsite is minimum, the working performance of the concrete mixture is optimal, and the fluidity, the cohesiveness and the water retention are relatively balanced. Under the condition of not changing the working performance of the concrete mixture, the loose porosity of the ceramsite is low, and the using amount of a cementing material can be reduced, so that the resource is saved, the production cost is reduced, the waste discharge is reduced, and the environment is protected. The lower the porosity of the ceramsite is, the better the working performance of the concrete mixture is.
TABLE 4 compression Strength of concrete with different size fraction component ratios
From the experimental results shown in table 4 and fig. 2, it can be known that, along with the decrease of the shale ceramsite size fraction of 9.5 mm-19.0 mm, the compressive strength of the concrete is increased first and then decreased, and then increased, the development trend of the loose porosity of the shale ceramsite is approximately opposite, the main reason is that the loose porosity is small, the coarse aggregate is reasonably graded, the gel material fills the gaps of the fine aggregate, the fine aggregate fills the gaps of the coarse aggregate, the cement is completely hydrated, the compactness of the concrete test block is high, and the internal space is basically filled, so that the compressive strength is increased. But the actual improvement of the compressive strength of the concrete is not obvious, and the maximum improvement is only 5.5 percent. The main reason is that the compressive strength of the light high-strength concrete prepared by the experiment is higher, all of which are above 70MPa, and is close to the performance limit of raw materials, so that the actual improvement of the concrete compressive resistance is not large.
In addition, the apparent density of the light high-strength concrete prepared by the embodiment is 1750-1850 kg/m3
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. The light-weight high-strength concrete is characterized by comprising the following components in parts by weight: 350-500 parts of cement, 50-70 parts of silica fume, 50-70 parts of fly ash, 50-70 parts of mineral powder, 75-95 parts of river sand, 250-400 parts of ceramic sand, 550-700 parts of shale ceramsite and 100-200 parts of water; the shale ceramsite comprises fine ceramsite with the size fraction of 0-9.5 mm and coarse ceramsite with the size fraction of 9.5-19 mm; the mass ratio of the fine ceramsite to the coarse ceramsite is (3-7) to (3-7).
2. The lightweight high-strength concrete according to claim 1, characterized by comprising the following components in parts by weight: 400-450 parts of cement, 55-65 parts of silica fume, 55-65 parts of fly ash, 55-65 parts of mineral powder, 80-90 parts of river sand, 300-350 parts of ceramic sand, 600-650 parts of shale ceramsite and 130-170 parts of water.
3. The lightweight high-strength concrete according to claim 1, wherein the mass ratio of the fine ceramsite to the coarse ceramsite is (4-6) to (4-6).
4. A method for preparing a lightweight high-strength concrete according to any one of claims 1 to 3, characterized by comprising the steps of:
weighing cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water according to the weight parts of the components;
mixing cement, silica fume, fly ash, mineral powder, river sand, ceramic sand, shale ceramsite and water to obtain a mixture;
adding an additive into the mixture for mixing to obtain a concrete mixture;
and forming and curing the concrete mixture to obtain the light high-strength concrete.
5. The method for preparing the light weight and high strength concrete according to claim 4, wherein the admixture is a polycarboxylic acid water reducing agent.
6. The preparation method of the lightweight high-strength concrete according to claim 4, wherein the addition amount of the additive is 0.5-1.5% of the mass of the mixture.
7. A lightweight high-strength concrete prepared by the preparation method of any one of claims 4 to 6.
8. The lightweight high-strength concrete according to claim 7, wherein the apparent density of the lightweight high-strength concrete is 1750-1850 kg/m3And the 28d compressive strength is 72.1-76.1 MPa.
9. Use of the lightweight high-strength concrete according to any one of claims 1 to 4 and 7 to 8 as a building material.
CN202011144614.9A 2020-10-23 2020-10-23 Light high-strength concrete and preparation method and application thereof Pending CN112266210A (en)

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CN112960951A (en) * 2021-03-01 2021-06-15 中冶建筑研究总院有限公司 Precast structure combined by concrete and fiber composite bars and concrete preparation method

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