CN112592125A - Self-compacting coral lightweight concrete and preparation method thereof - Google Patents
Self-compacting coral lightweight concrete and preparation method thereof Download PDFInfo
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- CN112592125A CN112592125A CN202011482477.XA CN202011482477A CN112592125A CN 112592125 A CN112592125 A CN 112592125A CN 202011482477 A CN202011482477 A CN 202011482477A CN 112592125 A CN112592125 A CN 112592125A
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
-
- 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
-
- 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
-
- 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
Abstract
The invention discloses self-compacting coral lightweight concrete and a preparation method thereof, belonging to the technical field of building materials and comprising the following components in parts by weight: 350-450 parts of cement, 50-100 parts of fly ash, 30-60 parts of silica fume, 30-50 parts of fly ash floating beads, 750-830 parts of coral sand, 500-560 parts of corallite, 200-250 parts of water, 1.5-5 parts of water reducing agent, 0.1-1 part of defoaming agent and 0.01-0.2 part of thickening agent. The concrete adopts lightweight aggregate coral sand and coral stone to reduce the density of the aggregate, adopts fly ash floating beads to reduce the density of the gelled material slurry, reduces the overall density of the concrete, reduces the density difference between the slurry and the aggregate at the same time, and prevents the aggregate from floating or sinking; the water reducing agent and the thickening agent are mixed, so that the concrete has good workability, and the density of slurry is further reduced; the defoaming agent is adopted to improve the compactness of the gelled material slurry, so that the strength is improved. The self-compacting coral lightweight concrete prepared from local materials has the characteristics of high fluidity, low density and high strength, and meets the construction requirements of an ocean platform.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to self-compacting coral lightweight concrete and a preparation method thereof.
Background
The offshore island engineering construction is increased due to the ocean economic development and ocean equity maintenance in China, but the offshore island is far away from inland and is lack of fresh water and conventional coarse and fine aggregate. And for the ocean platform in the area with shallow water area and complex terrain, if the common concrete is adopted, the self weight of the upper structure is larger, the draft is deeper, and the bearing capacity of the lower structure needs to be increased. In order to reduce the structural section, lighten the self weight of the structure and facilitate the transportation of prefabricated parts, light concrete is required.
Coral is a porous structure material, water and slurry are absorbed seriously, and coral is mostly in a strip shape, so that the concrete using coral sand and coral in a conventional way has extremely poor working performance, small initial slump and quick slump loss; and because the coral aggregates have low strength, the compressive strength of the concrete using the coral aggregates is mostly not more than 30 MPa. In addition, the current research direction is mainly to improve the strength of coral concrete, and the use of coral to make lightweight concrete is rarely reported. Therefore, the self-compacting coral lightweight concrete and the preparation method thereof are very significant.
Disclosure of Invention
Aiming at the defects or defects in the prior art, the invention aims to provide the self-compacting coral lightweight concrete and the preparation method thereof, which can effectively solve the problems of poor workability and low strength in the existing coral concrete and the difficulty in meeting the requirements of ocean platform construction due to high density of the traditional concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides self-compacting coral lightweight concrete which comprises the following components in parts by weight: 350-450 parts of cement, 50-100 parts of fly ash, 30-60 parts of silica fume, 30-50 parts of fly ash floating beads, 750-830 parts of coral sand, 500-560 parts of corallite, 200-250 parts of water, 1.5-5 parts of water reducing agent, 0.1-1 part of defoaming agent and 0.01-0.2 part of thickening agent.
Further, the self-compacting coral lightweight concrete comprises the following components in parts by weight: 450 parts of cement, 100 parts of fly ash, 60 parts of silica fume, 30 parts of fly ash floating beads, 750 parts of coral sand, 560 parts of corallite, 200 parts of water, 5 parts of water reducing agent, 0.25 part of defoaming agent and 0.05 part of thickening agent.
Further, the cement is ordinary portland cement with the strength grade of 42.5 and the specific surface area of 358m2The initial setting time is 220min, the final setting time is 270min, the ignition loss is 3.13 percent, the 28d compressive strength is 56.1MPa, and the 28d flexural strength is 8.8 MPa.
Further, the fly ash is I-grade fly ash, and the apparent density of the fly ash is 2200 to 2500kg/m3。
Further, the silica fume is SiO2Mass fraction is more than or equal to 92 percent, and specific surface area is more than or equal to 15m2(g) high-purity silicon powder for construction with the screening allowance of 45 mu m being less than or equal to 2.0 percent, and the apparent density of the silicon powder for construction is 2000-2400 kg/m3。
Further, the particle size of the fly ash floating bead is 100-200 meshes, and the bulk density is 400-500 kg/m3。
Further, the coral sand is middle coral sand of area II, and the bulk density is 1200-1400 kg/m3。
Further, the corallite has a continuous gradation of 5-16mm in particle size and a bulk density of 900-1050 kg/m3。
Further, the water is seawater.
Further, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than 40%.
Further, the defoaming agent is a solid powdery defoaming agent, preferably a silicone defoaming agent.
Further, the thickener is methylcellulose, carboxymethylcellulose or hydroxypropyl methylcellulose ether, preferably hydroxypropyl methylcellulose ether.
The preparation method of the self-compacting coral lightweight concrete comprises the following steps:
(1) weighing the components according to the raw material ratio, putting the weighed cement, fly ash, silica fume, fly ash floating beads, coral sand, coral stone, a water reducing agent, a defoaming agent and a thickening agent into a stirrer, and stirring for 30-60 s;
(2) adding 1/2 weight of water into the product obtained in the step (1), stirring for 2-5 min, adding the rest weight of water, continuing stirring for 2-5 min, and uniformly stirring to obtain the self-compacting coral lightweight concrete.
The invention has the beneficial effects that:
(1) the lightweight aggregate coral sand and coral stone are adopted to replace the traditional sandstone, so that the density of the concrete aggregate is reduced; the fly ash floating beads are adopted to reduce the density of the slurry of the cementing material, and simultaneously reduce the density difference between the slurry and the aggregate, so that the density of the slurry is matched with that of the aggregate, the density of each component is proper, the problem of uneven distribution of the lightweight aggregate is solved while the density of the concrete is obviously reduced, and the aggregate is prevented from floating upwards or sinking;
(2) the fly ash floating bead has fine and hollow particles and the characteristic of low viscosity, the floating beads can easily flow among each other, the fluidity of concrete can be effectively improved, the density of gelled material slurry is reduced, and the self-compaction coral lightweight concrete can flow by the gravity of the self-compaction coral lightweight concrete;
(3) the water reducing agent, the thickening agent and the defoaming agent are mixed, harmful large-aperture bubbles in concrete are eliminated, the number of capillary holes and small air holes in a concrete matrix is increased, the small air holes are uniformly and discretely distributed, the escape of the bubbles is inhibited, the density of the concrete matrix is further reduced, coral aggregates are in a stable dispersion state, the floating of coral sand and the sinking of coral stones are inhibited, and the coral lightweight concrete has good working performance and mechanical performance and is free of segregation and bleeding phenomena and is a uniform and stable multi-phase body;
(4) the three components of the fly ash, the silica fume and the fly ash floating bead are simultaneously used as admixture, and the active effect of the fly ash and the silica fume is utilized to react with the cement hydration product calcium hydroxide to generate hydrated calcium silicate, hydrated calcium aluminate and other gels, thereby promoting the cement hydration, enhancing the strength of a concrete system and simultaneously improving the corrosion resistance of the concrete; by utilizing the morphological effect and the micro-aggregate effect of the fly ash and the silica fume, the deflocculation effect of the initial cement hydration is promoted, the pores among cement particles in the lightweight concrete are effectively filled through close packing, the compactness of the system is enhanced, and the hardening strength is improved. In addition, the larger the amount of doped silica fume is, the larger the self-contractibility of the concrete is, but if the amount of doped silica fume is too small, the activity effect, the morphological effect and the micro-aggregate effect of the concrete are difficult to exert, so that the self-contractibility of the concrete is gradually reduced with the increase of the amount of the fly ash by adopting the main amount of the fly ash and the auxiliary amount of the silica fume, and the self-contractibility of the concrete is regulated and controlled through the regulation and control of the amounts of the fly ash and the silica fume, so that the mechanical property of the concrete can be greatly improved when the self-contractibility of the concrete is ensured to be smaller;
(5) the preparation method of the self-compacting coral lightweight concrete provided by the invention is simple in process, the required raw materials are simple and easy to obtain, the coral sand, the corallite and the seawater of the offshore island are fully utilized and locally obtained, the transportation cost of the raw materials is reduced, the transportation time is saved, and the prepared self-compacting coral lightweight concrete meets the construction requirement of an ocean platform.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be purely exemplary of the invention and are not intended to be limiting.
Example 1
The embodiment 1 provides a self-compacting coral lightweight concrete, which comprises the following components in parts by weight: 350 parts of cement, 70 parts of fly ash, 50 parts of silica fume, 50 parts of fly ash floating beads, 830 parts of coral sand, 560 parts of corallite, 250 parts of seawater, 1.5 parts of water reducing agent, 0.25 part of defoaming agent and 0.05 part of hydroxypropyl methyl cellulose ether.
The cement is ordinary Portland cement with the strength grade of 42.5 and the specific surface area of 358m2The initial setting time is 220min, the final setting time is 270min, the ignition loss is 3.13 percent, the 28d compressive strength is 56.1MPa, and the 28d flexural strength is 8.8 MPa.
The fly ash is I-grade fly ash, and the apparent density of the fly ash is 2489kg/m3。
The silica fume is SiO2Mass fraction is more than or equal to 92 percent, and specific surface area is more than or equal to 15m2(g) high-purity silicon powder for construction with the screening residue of less than or equal to 2.0 percent and the apparent density of the silicon powder is 2195kg/m3。
The particle diameter of the fly ash floating bead is 100-200 meshes, and the bulk density is 450kg/m3。
Coral sand in zone IISand having a bulk density of 1384kg/m3。
The corallite has 5-16mm continuous grading grain size and 956kg/m bulk density3。
The water reducing agent is solid powdery polycarboxylate water reducing agent, and the water reducing rate is more than 40%.
The defoaming agent is a solid powdery defoaming agent, in particular to an organic silicon defoaming agent.
The preparation method of the self-compacting coral lightweight concrete provided in the embodiment 1 comprises the following steps:
(1) weighing the components according to the raw material ratio, putting the weighed cement, fly ash, silica fume, fly ash floating beads, coral sand, coral stone, water reducing agent, defoaming agent and thickening agent into a stirrer, and stirring for 30 s;
(2) adding 1/2 weight of water into the product obtained in the step (1), stirring for 2min, adding the rest weight of water, continuing stirring for 2min, and uniformly stirring to obtain the self-compacting coral lightweight concrete.
Example 2
The embodiment 2 provides a self-compacting coral lightweight concrete and a preparation method thereof, and the difference from the embodiment 1 is only that: 400 parts of cement, 90 parts of fly ash, 60 parts of silica fume, 30 parts of fly ash floating beads, 783 parts of coral sand, 600 parts of corallite, 233 parts of seawater, 4 parts of water reducing agent, 0.25 part of defoaming agent and 0.05 part of hydroxypropyl methyl cellulose ether, and the rest parameters and the steps of the preparation method are the same.
Example 3
This example 3 provides a self-compacting coral lightweight concrete and a preparation method thereof, which are different from those of example 1 only in that: 450 parts of cement, 100 parts of fly ash, 60 parts of silica fume, 30 parts of fly ash floating bead, 750 parts of coral sand, 560 parts of corallite, 200 parts of seawater, 5 parts of water reducing agent and 0.25 part of defoaming agent
And 0.05 part of hydroxypropyl methyl cellulose ether, and the rest parameters are the same as the steps of the preparation method.
Comparative example 1
This comparative example 1 provides a concrete and a method for preparing the same, which are different from example 1 only in that: 350 parts of cement, 160 parts of silica fume, 50 parts of fly ash floating bead, 830 parts of coral sand, 560 parts of corallite, 250 parts of seawater, 1.5 parts of water reducing agent, 0.25 part of defoaming agent and 0.05 part of hydroxypropyl methyl cellulose ether, and the rest parameters are the same as the steps of the preparation method.
Comparative example 2
Comparative example 2 provides a concrete and a method for preparing the same, which are different from example 1 only in that: 350 parts of cement, 100 parts of fly ash, 60 parts of silica fume, 750 parts of coral sand, 560 parts of corallite, 200 parts of seawater, 5 parts of water reducing agent, 0.25 part of defoaming agent and 0.05 part of hydroxypropyl methyl cellulose ether, and the rest parameters and the steps of the preparation method are the same.
Comparative example 3
This comparative example 3 provides a concrete and a method for preparing the same, which are different from example 1 only in that: 350 parts of cement, 50 parts of fly ash, 100 parts of silica fume, 50 parts of fly ash floating beads, 750 parts of coral sand, 560 parts of corallite, 200 parts of seawater, 5 parts of water reducing agent, 0.25 part of defoaming agent and 0.05 part of hydroxypropyl methyl cellulose ether, and the rest parameters and the steps of the preparation method are the same.
Comparative example 4
This comparative example 4 provides a concrete and a method for preparing the same, which are different from example 1 only in that: 400 parts of cement, 90 parts of fly ash, 60 parts of silica fume, 30 parts of fly ash floating beads, 783 parts of coral sand, 600 parts of corallite, 214 parts of seawater, 5 parts of water reducing agent and 0.05 part of hydroxypropyl methyl cellulose ether, and the rest parameters are the same as the steps of the preparation method.
Comparative example 5
This comparative example 5 provides a concrete and a method for preparing the same, which are different from example 1 only in that: 400 parts of cement, 90 parts of fly ash, 60 parts of silica fume, 30 parts of fly ash floating beads, 783 parts of coral sand, 600 parts of coral stone, 233 parts of seawater, 4 parts of water reducing agent and 0.25 part of defoaming agent, and the rest parameters are the same as the steps of the preparation method.
In order to investigate the performance of the self-compacting coral lightweight concrete prepared by the method, the slump of the fresh concrete is tested by referring to the test methods of a slump test and an expansion test in GB/T50080; after the test is finished, filling the concrete mixture into test molds with the size of 100mm multiplied by 100mm twice, wherein the filling thickness of each layer is equal, the interval between the layers is 10s, each mixing ratio is respectively formed into 6 test blocks, after the test pieces are formed, the surfaces of the test pieces are immediately covered by plastic films, after the test pieces are placed in a room with the temperature of 20 +/-5 ℃ for 1d, the test pieces are demoulded, and after the demoulded, the test pieces are immediately placed into a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of more than or equal to 95 percent for curing until; after the maintenance is finished, three test blocks are respectively taken according to each proportion, the 28d compressive strength is tested according to the compressive strength test method in GB/T50081, and the dry apparent density of the other three test blocks is tested according to the dry apparent density test method in JGJ/T12. The results of the tests of examples 1 to 3 and comparative examples 1 to 5 are shown in Table 1.
TABLE 1 slump, compressive strength and Dry apparent Density of examples 1-3 and comparative examples 1-5
| Numbering | Slump/mm | Extension/mm | Compressive strength/MPa | Dry apparent density/kg/m3 |
| Example 1 | 250 | 550 | 30.0 | 1800 |
| Example 2 | 275 | 600 | 34.1 | 1830 |
| Example 3 | 260 | 560 | 48.9 | 1850 |
| Comparative example 1 | 120 | — | 38.5 | 1842 |
| Comparative example 2 | 270 | 610 | 35.2 | 2245 |
| Comparative example 3 | 265 | 585 | 28.9 | 1895 |
| Comparative example 4 | 280 | 635 | 26.9 | 1814 |
| Comparative example 5 | 200 | — | 42.5 | 1928 |
As can be seen from Table 1, the overall performance of examples 1-3 is superior to that of comparative examples 1-5, and the dry apparent density data indicates that the requirements for lightweight concrete are met. Comparative examples 1-5 show that the dry apparent density of the prepared concrete is higher without using fly ash floating beads; when the usage amount of the silica fume is large, although the silica fume has good compressive strength, the slump is small, and the fluidity is poor; when the defoaming agent is not used, the strength of the concrete is low; when no thickener is used, the concrete has poor fluidity. In conclusion, the self-compacting coral lightweight concrete prepared by the specific components and the specific dosage has the characteristics of low density, good workability and high strength, and can meet the construction requirements on ocean platforms.
The foregoing is merely exemplary and illustrative of the present invention and it is within the purview of one skilled in the art to modify or supplement the embodiments described or to substitute similar ones without the exercise of inventive faculty, and still fall within the scope of the claims.
Claims (10)
1. The self-compacting coral lightweight concrete is characterized by comprising the following components in parts by weight: 350-450 parts of cement, 50-100 parts of fly ash, 30-60 parts of silica fume, 30-50 parts of fly ash floating beads, 750-830 parts of coral sand, 500-560 parts of corallite, 200-250 parts of water, 1.5-5 parts of water reducing agent, 0.1-1 part of defoaming agent and 0.01-0.2 part of thickening agent.
2. The self-compacting coral lightweight concrete of claim 1, comprising the following components in parts by weight: 450 parts of cement, 100 parts of fly ash, 60 parts of silica fume, 30 parts of fly ash floating beads, 750 parts of coral sand, 560 parts of corallite, 200 parts of water, 5 parts of water reducing agent, 0.25 part of defoaming agent and 0.05 part of thickening agent.
3. The self-compacting coral lightweight concrete of claim 1 or 2, wherein the cement is ordinary portland cement, the water is seawater, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than 40%.
4. The self-compacting coral lightweight concrete as claimed in claim 1 or 2, wherein the fly ash is class I fly ash, and the apparent density thereof is 2200 to 2500kg/m3。
5. The self-compacting coral lightweight concrete of claim 1 or 2, wherein said silica fume is SiO2Mass fraction is more than or equal to 92 percent, and specific surface area is more than or equal to 15m2(g) silicon powder with the screening allowance of less than or equal to 2.0 percent and the apparent density of 45 mu m is 2000-2400 kg/m3。
6. The self-compacting coral lightweight concrete according to claim 1 or 2, wherein the fly ash floating beads have a particle size of 100-200 mesh and a bulk density of 400-500 kg/m3。
7. The self-compacting coral lightweight concrete according to claim 1 or 2, wherein said coral sand is a second-zone coral medium sand having a bulk density of 1200 to 1400kg/m3。
8. The self-compacting coral lightweight concrete according to claim 1 or 2, wherein said coral stone is of 5-16mm continuous gradation and has a bulk density of 900-1050 kg/m3。
9. The self-compacting coral lightweight concrete of claim 1 or 2, wherein said thickener is methylcellulose, carboxymethylcellulose or hydroxypropyl methylcellulose ether.
10. The method for preparing the self-compacting coral lightweight concrete according to any one of claims 1 to 9, comprising the following steps:
(1) weighing the components according to the raw material ratio, putting the weighed cement, fly ash, silica fume, fly ash floating beads, coral sand, coral stone, a water reducing agent, a defoaming agent and a thickening agent into a stirrer, and stirring for 30-60 s;
(2) adding 1/2 weight of water into the product obtained in the step (1), stirring for 2-5 min, adding the rest weight of water, continuing stirring for 2-5 min, and uniformly stirring to obtain the self-compacting coral lightweight concrete.
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| CN113582632A (en) * | 2021-09-14 | 2021-11-02 | 深圳市思力佳化工建材有限公司 | High-flow-state lightweight concrete, preparation method thereof and method for applying high-flow-state lightweight concrete to non-bearing wall |
| CN113773006A (en) * | 2021-09-16 | 2021-12-10 | 中交公路长大桥建设国家工程研究中心有限公司 | Ultrahigh-strength lightweight concrete and preparation method thereof |
| CN113860797A (en) * | 2021-11-19 | 2021-12-31 | 中建西部建设西南有限公司 | High-strength lightweight aggregate for concrete and preparation method thereof |
| CN114735985A (en) * | 2022-05-17 | 2022-07-12 | 广州大学 | Anti-cracking high-strength coral mortar and preparation method thereof |
| CN117361982A (en) * | 2023-10-26 | 2024-01-09 | 北京空间智筑技术有限公司 | Light 3D printing concrete and preparation method thereof |
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| CN117361982A (en) * | 2023-10-26 | 2024-01-09 | 北京空间智筑技术有限公司 | Light 3D printing concrete and preparation method thereof |
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