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Calcium sulfate-doped high-performance fiber cement-based composite material and preparation method thereof

A high-performance fiber and composite material technology, applied in the field of cement materials, can solve the problems of low matrix strength and achieve the effects of improving interface performance, reducing carbon emissions, and good toughness

Inactive Publication Date: 2019-06-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fresh fiber cement-based composites prepared by referring to the previous literature often have low matrix strength when obtaining high tensile properties due to the difference in physical and chemical properties between the raw material components.

Method used

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  • Calcium sulfate-doped high-performance fiber cement-based composite material and preparation method thereof
  • Calcium sulfate-doped high-performance fiber cement-based composite material and preparation method thereof
  • Calcium sulfate-doped high-performance fiber cement-based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A high-performance fiber cement-based composite material mixed with calcium sulfate in the present invention, calculated by mass parts, the composition and content of raw materials in the composite material are as follows:

[0039] Cement: 500.1 parts

[0040] Fly ash: 1083.5 parts

[0041] Silica fume: 83.3 parts

[0042] Quartz sand: 600.1 parts

[0043] Calcium sulfate: 33.3 parts

[0044] Water: 450.1 parts

[0045] Water reducing agent: 15.2 parts

[0046] Thickener: 1 part

[0047] PVA fiber: 39.3 parts

[0048] The cement described in the examples is ordinary Portland cement of strength grade 42.5.

[0049] The fly ash described in the examples is primary fly ash.

[0050] The silica fume described in the examples is silica fume with a silicon content of 94wt%.

[0051] The quartz sand described in the embodiment is 80-120 mesh quartz sand.

[0052] Calcium sulfate described in the embodiment is calcium sulfate dihydrate whisker-like powder.

[0053] T...

Embodiment 2

[0064] A high-performance fiber cement-based composite material mixed with calcium sulfate in the present invention, calculated by mass parts, the composition and content of raw materials in the composite material are as follows:

[0065] Cement: 500.1 parts

[0066] Fly ash: 1083.5 parts

[0067] Silica fume: 83.3 parts

[0068] Quartz sand: 600.1 parts

[0069] Calcium sulfate: 66.6 parts

[0070] Water: 450.1 parts

[0071] Water reducing agent: 15.2 parts

[0072] Thickener: 1 part

[0073] PVA fiber: 39.3 parts

[0074] Other implementation content and steps are the same as embodiment 1.

[0075] The mechanical test results of the specimens obtained in this embodiment are shown in Table 2. The specimens were cured in a standard manner, and the curing age was 28 days.

[0076] Table 2: The mechanical performance test results of the specimens obtained in Example 2

[0077]

Embodiment 3

[0079] A high-performance fiber cement-based composite material mixed with calcium sulfate in the present invention, calculated by mass parts, the composition and content of raw materials in the composite material are as follows:

[0080] Cement: 750.1 parts

[0081] Fly ash: 833.4 parts

[0082] Silica fume: 83.3 parts

[0083] Quartz sand: 600.1 parts

[0084] Calcium sulfate: 33.3 parts

[0085] Water: 416.8 parts

[0086] Water reducing agent: 18 parts

[0087] Thickener: 1 part

[0088] PVA fiber: 38.4 parts

[0089] Other implementation content and steps are the same as embodiment 1.

[0090] The mechanical test results of the test piece obtained in this embodiment are shown in Table 3, and the test piece adopts standard curing, and the curing age is 28 days.

[0091] Table 3: The mechanical performance test results of the specimens obtained in Example 3

[0092]

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Abstract

The invention discloses a calcium sulfate-doped high-performance fiber cement-based composite material and a preparation method thereof, and belongs to the technical field of cement materials. The calcium sulfate-doped high-performance fiber cement-based composite material consists of cement, fly ash, silica fume, quartz sand, calcium sulfate, water, a water reducing agent, a thickening agent andPVA fibers. The preparation method comprises the following steps of: mixing and pouring the cement, the fly ash, the silica fume, the quartz sand, the calcium sulfate and the thickening agent into a stirrer for dry stirring for two minutes; pouring the water reducing agent into the water, and pouring the mixture of the water reducing agent and the water into the stirrer for stirring for four minutes after being fully and uniformly mixed; and then adding the PVA fibers into a stirring pot for stirring for three minutes at the speed of 90-100 revolutions per minute and for one minute at the speed of 180-190 revolutions per minute. According to the composite material and the preparation method thereof, the raw materials are convenient to obtain, the preparation process is simple, and the strength of a test piece is improved while the good tensile mechanical property of the test piece is maintained by adding the calcium sulfate. Meanwhile, the fly ash is adopted to replace the cement in the cementing material, so that an industrial waste residue is consumed, and the carbon emission is reduced.

Description

technical field [0001] The invention belongs to the field of cement materials and relates to a cement-based composite material, in particular to a high-toughness PVA fiber-reinforced cement-based composite material mixed with calcium sulfate and a preparation method thereof. technical background [0002] Concrete is currently the most widely used civil engineering structural material in the world. It is easy to cast and form to obtain the required size and style of various components and structures, and has good water resistance and fire resistance. However, ordinary concrete materials have poor tensile properties, are brittle and easy to crack, and it is difficult to control the crack width after cracking. These defects affect the durability and are not conducive to the long-term use of the structure. In order to overcome these shortcomings and prolong the service life of concrete material structures, various high-performance cement-based composite materials have emerged in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/20C04B111/34
Inventor 王秋生罗昊温唯高晓静周济兵
Owner BEIJING UNIV OF TECH
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