CN112794669A - Lightweight aggregate wrapped with fiber and method for inhibiting lightweight aggregate from floating upwards - Google Patents
Lightweight aggregate wrapped with fiber and method for inhibiting lightweight aggregate from floating upwards Download PDFInfo
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- CN112794669A CN112794669A CN202110182151.3A CN202110182151A CN112794669A CN 112794669 A CN112794669 A CN 112794669A CN 202110182151 A CN202110182151 A CN 202110182151A CN 112794669 A CN112794669 A CN 112794669A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1074—Silicates, e.g. glass
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1062—Metals
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
Abstract
The invention discloses a lightweight aggregate wrapped with fiber and a method for inhibiting the lightweight aggregate from floating, wherein the prewetted lightweight aggregate and the fiber are connected into a whole through a small amount of cementing material slurry, a layer of cementing material slurry thin layer with the fiber is formed on the surface of the lightweight aggregate, a hairy spherical lightweight aggregate with the fiber is prepared after coagulation and hardening, and the lightweight aggregate is used as a novel coarse aggregate to prepare lightweight concrete. Therefore, the floating problem of the lightweight aggregate is effectively solved, and the homogeneity of the test piece is ensured; one end of the light aggregate surface fiber is embedded in the cementing material thin layer coated on the aggregate surface, and the other end of the light aggregate surface fiber is embedded in the concrete slurry, so that the contact area between the aggregate and the cement slurry is increased.
Description
Technical Field
The invention relates to a lightweight aggregate wrapped with fiber and a method for inhibiting the lightweight aggregate from floating, belonging to the technical field of concrete.
Background
The lightweight aggregate concrete is concrete using lightweight aggregate, and its apparent density is not more than 1950kg/m3. The common lightweight aggregate comprises natural lightweight aggregate and artificial lightweight aggregate, wherein the natural lightweight aggregate comprises pumice and scoria; the artificial lightweight aggregate comprises shale ceramsite, clay ceramsite, expanded perlite and the like, and in addition, industrial waste materials such as fly ash ceramsite and expanded slag beads can also be used as the lightweight aggregate to prepare lightweight aggregate concrete. Because the lightweight aggregate concrete has the characteristics of light weight, high strength, heat preservation, heat insulation, good shock resistance, good deformation performance and the like, the lightweight aggregate concrete is widely applied to industrial and civil buildings and other projects in recent years and has better application prospect. The lightweight aggregate concrete is easy to float upwards in the pouring process, so that the concrete is separated in layers, the workability and durability of the newly mixed concrete are influenced, and the service life of a concrete structure and a member is further influenced. In order to effectively control the floating of lightweight aggregate in lightweight concrete, the prior Chinese invention patents adopt methods of adding additives in 'a method for improving the floating of lightweight aggregate in concrete', 'lightweight concrete for inhibiting the floating of aggregate' and 'lightweight ceramsite concrete for preventing the floating of aggregate and a preparation method thereof', and inhibit the floating of lightweight aggregate by increasing the consistency of slurry, but the methods can not accurately control the doping amount of the additives and can inevitably cause certain influence on the construction performance of concrete. The invention aims to provide a novel lightweight aggregate and a method for inhibiting the lightweight aggregate from floating, and the lightweight aggregate is inhibited from floating on the premise of ensuring the good workability of concrete.
Disclosure of Invention
The invention aims to design a lightweight aggregate wrapped with fibers and a method for inhibiting the lightweight aggregate from floating, which can effectively improve the floating phenomenon of the lightweight aggregate in concrete, thereby ensuring the uniformity and appearance smoothness of a pouring test piece, further improving the durability of a structure or a member and ensuring the engineering quality.
A lightweight aggregate capable of inhibiting floating upward and a preparation method thereof, comprising the following steps: firstly, mixing the pre-wetted lightweight aggregate with the cementing material slurry and uniformly stirring; then adding fibers and stirring to form a layer of gelled material slurry thin layer with the fibers on the surface of the lightweight aggregate, wherein one end of the fibers is embedded in the wrapping slurry on the surface layer of the lightweight aggregate, and the other end of the fibers is exposed on the surface of the slurry to form particles in a fuzzy ball shape; finally, the ball-shaped lightweight aggregate is screened into single particles, and the ball-shaped lightweight aggregate wrapped with fibers is formed after coagulation and hardening.
In the process of pouring concrete prepared by the lightweight aggregate with the fibers, the fibers uniformly distributed on the surface of the lightweight aggregate increase the contact area between the lightweight aggregate and the surrounding mortar, so that the cementing surface of the lightweight aggregate and the mortar is increased, and the lightweight aggregate is subjected to larger cementing action force; and the free end of the surface fiber of the lightweight aggregate is embedded in the surrounding mortar, and when the lightweight aggregate moves, the tensile force and the frictional resistance for preventing the lightweight aggregate from floating upwards can be generated, so that the lightweight aggregate cannot float upwards and is uniformly distributed in a concrete test piece, and the problem that the lightweight aggregate in the concrete floats upwards is effectively solved.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) compared with other methods, the invention prepares a novel lightweight aggregate: the invention firstly integrates the prewetted lightweight aggregate and the fiber through a small amount of cementing material slurry, a layer of cementing material slurry thin layer with the fiber is formed on the surface of the lightweight aggregate, the lightweight aggregate is coagulated and hardened to prepare the hairy spherical lightweight aggregate with the fiber, and the lightweight aggregate is used as a novel coarse aggregate to prepare the lightweight concrete. The lightweight aggregate in the concrete is uniformly distributed in the concrete sample due to the tension effect among fibers and the cementation effect of mortar, and the lightweight aggregate cannot float upwards. Therefore, the floating problem of the lightweight aggregate is effectively solved, and the homogeneity of the test piece is ensured;
(2) in the prepared lightweight concrete, one end of the novel lightweight aggregate surface fiber is embedded and fixed in a cementing material thin layer coated on the aggregate surface, and the other end of the novel lightweight aggregate surface fiber is embedded and fixed in concrete slurry, so that the contact area of the aggregate and cement paste is increased, and compared with a method of directly adding the fiber, the concrete prepared by the method has higher tensile strength and interface bonding strength of the aggregate and the cement paste, so that the lightweight aggregate is prevented from floating upwards more effectively;
(3) concrete is used as a brittle material and is easy to crack and damage, but because of fibers on the surface of aggregate, the crack development resistance and the bonding performance of concrete are improved, the durability of a structure or a member is further improved, and the engineering quality is ensured.
Drawings
FIG. 1 is a preparation process of an anti-floating lightweight aggregate
FIG. 2 is an equivalent model diagram of a lightweight aggregate
FIG. 3 schematic diagram of light aggregate screening
FIG. 4 light concrete preparation process
FIG. 5 is a stress analysis diagram of the novel lightweight aggregate and the common aggregate in the test piece
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 specific embodiment is as follows:
as shown in FIG. 1, the preparation method of the novel lightweight aggregate of the present invention comprises the following steps:
(1) preparing a gelled material slurry: the gelled material slurry is prepared by mixing a gelled material, water, a chemical additive and a mineral admixture according to a certain proportion. The mixture ratio of the cementing material to the chemical additive to the mineral admixture is 1: 0.45: 0.03: 0.7, wherein the cementing material is ordinary portland cement with the grade of 52.5; the mineral admixture comprises fly ash, granulated blast furnace slag, silica fume and the like, wherein the fly ash is I-grade fly ash, and S95-grade mineral powder is taken as the granulated blast furnace slag; the additive is a polycarboxylic acid high-performance water reducing agent with the concentration of 30%.
(2) Preparing a lightweight aggregate for inhibiting floating: and (2) mixing the pre-wetted lightweight aggregate with the cementing material slurry prepared in the step (1), uniformly stirring, adding a certain amount of fibers, and uniformly stirring to form a layer of cementing material slurry thin layer with the fibers on the surface of the lightweight aggregate, wherein one end of the fibers is embedded in the wrapping slurry on the surface layer of the lightweight aggregate, and the other end of the fibers is exposed on the surface of the slurry to form particles in a fuzzy ball shape. At the moment, the lightweight aggregate is sieved into particles by a sieve with proper aperture, and the particles are coagulated and hardened to form the lightweight aggregate with fibers. Wherein the lightweight aggregate is sintered ceramsite with the particle size of 30mm, the grading is continuous, the thickness is uniform, and the ceramsite is pre-wetted before being stirred for ensuring the workability and the strength of concrete because the lightweight aggregate has high water absorption; the fiber is steel fiber with diameter of 18-48 μm, length of 20mm, and fiber content of 2%.
(3) Preparing lightweight concrete by using the lightweight aggregate obtained in the step (2) as a novel coarse aggregate, wherein the mixture ratio of cement to mineral admixture to coarse aggregate to fine aggregate to water to admixture is 1:0.7:1.4:1.6:0.4:0.03, and the fine aggregate adopts river sand and ceramic sand, and the mass ratio is 4: 1; and then the prepared lightweight concrete is filled into a mold and vibrated to be uniform and dense, so that the required concrete structure or member is prepared.
(4) After the concrete is vibrated and before the concrete is initially set, manually plastering the top of the test piece, and repeatedly plastering and pressing the test piece. The aim is to press part of the floating lightweight aggregate back into the cement slurry by manual pressure, so as to reduce the floating of the lightweight aggregate and ensure the surface of the test piece to be smooth; and the test piece is cured in a standard curing room after being manufactured.
The core of the invention is that lightweight aggregate and fiber are bonded together through a thin layer of cementing material slurry to prepare a novel wool ball-shaped lightweight aggregate wrapped with fiber, then the lightweight aggregate is used as a novel coarse aggregate to prepare lightweight concrete, and the floating of the lightweight aggregate in the concrete is inhibited by increasing the gravity of the aggregate, the interface bonding strength of the aggregate and the concrete slurry, the tension acting force of the fiber on the aggregate and the like.
As shown in figure 1, a thin layer of cementing material 1 is wrapped on the periphery of a common lightweight aggregate 2, one end of a fiber 3 is wrapped in the cementing material thin layer 1, the other end of the fiber is exposed on the surface, the prepared novel lightweight aggregate 4 is a ball-shaped particle, in order to obtain more obvious experimental effect, an ideal novel lightweight aggregate model 5 is equivalently substituted for 4, and the effect is shown in figure 2.
As shown in fig. 3, the aggregate is sieved into roughly spherical particles by a sieve 6 to obtain a novel lightweight aggregate 5, and the prepared novel lightweight aggregate 5 is used as a coarse aggregate to prepare lightweight concrete as shown in fig. 4.
In order to better show the experimental effect, the stress analysis of the aggregate was performed on lightweight concrete prepared with the novel lightweight aggregate and the ordinary lightweight aggregate, respectively, as shown in fig. 5:
the two different lightweight aggregates are respectively prepared into the same concrete sample 7, the left sample in fig. 5 is prepared by using the novel lightweight aggregate 5, the right sample is prepared by using the common lightweight aggregate, and the single aggregate is subjected to stress analysis respectively to obtain: the novel lightweight aggregate 5 and the common lightweight aggregate 2 are both coated by mortar 8, both aggregates are subjected to the same floating force 9, compared with the common lightweight aggregate, the novel lightweight aggregate is subjected to larger gravity 10 and larger interface bonding force 12, and a fiber tension acting force 11 exists, so that the floating of the aggregates can be effectively inhibited, and the novel lightweight aggregate 5 is uniformly distributed in a concrete test piece.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in detail, and should not be construed as limiting the invention, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A method for suppressing the floating of a lightweight aggregate, characterized by comprising: the method comprises the following steps: firstly, mixing the pre-wetted lightweight aggregate with the cementing material slurry and uniformly stirring; then adding fibers and stirring to form a layer of gelled material slurry thin layer with the fibers on the surface of the lightweight aggregate, wherein one end of the fibers is embedded in the wrapping slurry on the surface layer of the lightweight aggregate, and the other end of the fibers is exposed on the surface of the slurry to form particles in a fuzzy ball shape; finally, the ball-shaped lightweight aggregate is screened into single particles, and the ball-shaped lightweight aggregate wrapped with fibers is formed after coagulation and hardening.
2. The method for suppressing the floating of a lightweight aggregate according to claim 1, wherein: the gelled material slurry is formed by mixing a gelled material, water, a chemical additive and a mineral admixture according to a certain proportion; the mixture ratio of the cementing material to the chemical additive to the mineral admixture is 1: 0.45: 0.03: 0.7, wherein the cementing material is ordinary portland cement with the grade of 52.5; the mineral admixture comprises fly ash, granulated blast furnace slag, silica fume and the like, wherein the fly ash is I-grade fly ash, and S95-grade mineral powder is taken as the granulated blast furnace slag; the additive is a polycarboxylic acid high-performance water reducing agent with the concentration of 30%.
3. The method for suppressing the floating of a lightweight aggregate according to claim 1, wherein: the fiber is steel fiber with diameter of 18-48 μm, length of 20mm, and fiber content of 2%.
4. The method for suppressing the floating of a lightweight aggregate according to claim 1, wherein: the lightweight concrete comprises cement, a mineral admixture, coarse aggregate, fine aggregate, water and an additive in a mass ratio of 1:0.7:1.4:1.6:0.4:0.03, wherein the fine aggregate is river sand and ceramic sand, and the mass ratio is 4:1.
5. The method for suppressing the floating of a lightweight aggregate according to claim 1, wherein: a thin layer of cementing material is wrapped on the periphery of the common lightweight aggregate, one end of the fiber is wrapped in the thin layer of the cementing material, the other end of the fiber is exposed on the surface, and the prepared novel lightweight aggregate is a hair ball-shaped particle.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113605168A (en) * | 2021-08-04 | 2021-11-05 | 黄鹏宇 | Old cement concrete adds spreads and reforms transform structure |
| CN113735497A (en) * | 2021-09-13 | 2021-12-03 | 江苏绿利新材料科技有限公司 | High-viscosity special mortar for prefabricated building and preparation method thereof |
| CN115477513A (en) * | 2022-09-14 | 2022-12-16 | 重庆中吉达环保科技有限公司 | High-strength lightweight aggregate concrete and preparation method thereof |
| CN115636645A (en) * | 2022-10-31 | 2023-01-24 | 深圳市航天新材科技有限公司 | Superfine sea sand concrete and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113605168A (en) * | 2021-08-04 | 2021-11-05 | 黄鹏宇 | Old cement concrete adds spreads and reforms transform structure |
| CN113735497A (en) * | 2021-09-13 | 2021-12-03 | 江苏绿利新材料科技有限公司 | High-viscosity special mortar for prefabricated building and preparation method thereof |
| CN115477513A (en) * | 2022-09-14 | 2022-12-16 | 重庆中吉达环保科技有限公司 | High-strength lightweight aggregate concrete and preparation method thereof |
| CN115477513B (en) * | 2022-09-14 | 2023-08-04 | 重庆中吉达环保科技有限公司 | High-strength lightweight aggregate concrete and preparation method thereof |
| CN115636645A (en) * | 2022-10-31 | 2023-01-24 | 深圳市航天新材科技有限公司 | Superfine sea sand concrete and preparation method thereof |
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