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Seawater coral sand high-ductility cement-based composite material and preparation method thereof

A composite material and coral sand technology, applied in the field of cement-based composite materials, can solve the problems of poor workability of coral concrete, damage of concrete structure, accelerated corrosion of steel bars, etc., and achieve the effects of protecting the ecological environment, low cost and high ductility

Inactive Publication Date: 2022-07-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is usually forbidden to use seawater and coral sand as raw materials for traditional reinforced concrete materials, because the chloride ions in them will accelerate the corrosion of steel bars, resulting in the destruction and failure of concrete structures, and coral sand is light and porous, and the prepared coral concrete usually has poor workability and low strength

Method used

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  • Seawater coral sand high-ductility cement-based composite material and preparation method thereof
  • Seawater coral sand high-ductility cement-based composite material and preparation method thereof
  • Seawater coral sand high-ductility cement-based composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] A seawater coral sand high ductility cement-based composite material, each component is calculated as a mass component, as shown in Table 1.

[0036] Table 1 embodiment 1 product mix ratio (mass parts ratio)

[0037] Numbering cement fly ash seawater coral sand water reducer fiber Example 1 200 800 300 210 1.6 15

[0038] The above cement is ordinary Portland cement with a strength grade of 42.5, the coral sand particle size is 0.6 mm, the seawater chloride ion concentration is 30000 mg / L, and the fibers are polyvinyl alcohol fibers.

[0039] The preparation steps are as follows:

[0040] (1) Add coral sand and a certain weight of seawater into the mixer, stir for 1 minute, mix well, and let stand for 10 minutes;

[0041] (2) adding cement, fly ash and water reducing agent to the mixer for dry mixing for 2 minutes;

[0042] (3) Pour seawater into the mixture and stir for 3 minutes;

[0043] (4) Add fiber and stir for 4 minutes; ...

Embodiment 2

[0047] A seawater coral sand high ductility cement-based composite material, each component is calculated as a mass component, as shown in Table 1.

[0048] Table 2 embodiment 2 product mix ratio (mass ratio)

[0049] Numbering cement fly ash seawater coral sand water reducer fiber Example 2 400 600 300 300 2.0 25

[0050] The above cement is ordinary Portland cement with a strength grade of 42.5, the coral sand particle size is 0.6 mm, the seawater chloride ion concentration is 15000 mg / L, and the fibers are polyvinyl alcohol fibers.

[0051] The preparation steps are as follows:

[0052] (1) Add coral sand and a certain weight of seawater into the mixer, stir for 3 minutes, mix well, and let stand for 15 minutes;

[0053] (2) adding cement, fly ash and water reducing agent to the mixer for dry mixing for 3 minutes to obtain a well-mixed mixture;

[0054] (3) Pour seawater into the mixture and stir for 4 minutes;

[0055] (4) Add fiber...

Embodiment 3

[0059] A seawater coral sand high ductility cement-based composite material, each component is calculated as a mass component, as shown in Table 1.

[0060] Table 3 embodiment 3 product mix ratio (mass parts ratio)

[0061] Numbering cement fly ash seawater coral sand water reducer fiber Example 3 400 600 330 300 2.6 22

[0062] The above-mentioned cement is Portland cement of strength grade 42.5, the particle size of coral sand is 0.6 mm, the concentration of seawater chloride ion is 20000 mg / L, and the fiber is polyvinyl alcohol fiber.

[0063] The preparation steps are as follows:

[0064] (1) Add coral sand and a certain weight of seawater into the mixer, stir for 1 minute, mix well, and let stand for 10 minutes;

[0065] (2) adding cement, fly ash and water reducing agent to the mixer for dry mixing for 2 minutes to obtain a well-mixed mixture;

[0066] (3) Pour seawater into the mixture and stir for 3 minutes;

[0067] (4) Add fiber...

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Abstract

The invention discloses a seawater coral sand cement-based composite material and a preparation method thereof, the seawater coral sand cement-based composite material comprises the following components by mass: 200-400 parts of cement, 600-800 parts of fly ash, 300-330 parts of seawater, 210-350 parts of coral sand, 1.6-2.6 parts of a water reducer, and 15-25 parts of fiber; the preparation method comprises the following steps: firstly, adding the coral sand and a certain mass of seawater into a stirrer, stirring for 1-5 minutes, and then standing for at least 10-30 minutes; adding the cement, the fly ash and the water reducing agent into the stirrer, and carrying out dry mixing for 2-5 minutes; then adding seawater and stirring for 3-5 minutes; then adding fibers and stirring for 3-9 minutes; finally, mold filling and demolding are conducted, and then curing is conducted to a specified age. Seawater and coral sand are used as raw materials, local materials can be used during island reef construction, and the cost is low; the preparation method is simple, green and environment-friendly.

Description

technical field [0001] The invention relates to a cement-based composite material, in particular to a seawater coral sand high-ductility cement-based composite material and a preparation method thereof. Background technique [0002] my country is a big maritime country with a long coastline and abundant marine resources. There are more than 260 islands and reefs in the sea area of ​​nearly 3 million square kilometers. The islands and reefs are far from the mainland, and the environment is harsh. There is a lack of conventional building materials such as fresh water, aggregates, and steel bars. The realization of local materials is an important prerequisite for promoting the construction of islands and reefs. [0003] It is usually forbidden to use seawater and coral sand as raw materials for traditional reinforced concrete materials, because the chloride ions in it will accelerate the corrosion of steel bars, resulting in the destruction and failure of the concrete structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/28C04B22/00
CPCC04B28/04C04B14/28C04B22/0026C04B2201/50C04B2111/00017C04B18/08C04B2103/302C04B16/0641
Inventor 郭丽萍赵翎亦吕邦成费香鹏秦姚毅
Owner SOUTHEAST UNIV