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Method and special equipment for preparing unidirectionally-distributed steel fiber reinforced cement paste

A special equipment and steel fiber technology, which is applied in the field of preparing unidirectionally distributed steel fiber reinforced cement slurry, can solve the problems of increased raw material cost and low effective utilization efficiency of steel fiber, and achieve the increase of raw material cost and outstanding substantive effects.

Inactive Publication Date: 2012-07-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the distribution density of effective steel fibers must reach a certain value in order to truly resist cracking. To solve this problem, the method of increasing the overall content of steel fibers is generally adopted in engineering, so that even if they are randomly distributed, the steel along the direction of tensile stress There are still enough fibers to bear the corresponding load, and the performance of the cement slurry can be improved. The disadvantage of this is that the effective utilization efficiency of the steel fibers in the cement slurry is very low, and a large part of the steel fibers cannot play their due role. At the same time, it also leads to a substantial increase in the cost of raw materials for steel fiber reinforced cement slurry.

Method used

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  • Method and special equipment for preparing unidirectionally-distributed steel fiber reinforced cement paste
  • Method and special equipment for preparing unidirectionally-distributed steel fiber reinforced cement paste
  • Method and special equipment for preparing unidirectionally-distributed steel fiber reinforced cement paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The first step is to prepare the steel fiber cement slurry mixture

[0047] According to the mass ratio of water: cement: superplasticizer = 0.60: 1: 0 to form cement slurry, add steel fiber with a volume content of 0.3% in the cement slurry, first put the weighed mixing water into the mixer, Then put in the weighed cement and stir for 20 seconds, then slowly put in the weighed steel fiber while keeping the mixer continuously stirring, keep the mixer continuously stirring during the steel fiber feeding process, and continue stirring for 60 seconds after the steel fiber feeding is completed. Material, the measured fluidity of the steel fiber cement slurry mixture is 180mm;

[0048] The second step, pouring into the test mold

[0049] Pour the steel fiber cement slurry mixture prepared in the first step into a non-metallic test mold of 40mm×40mm×160mm;

[0050] The third step is to apply a magnetic field

[0051] Place the non-metallic test mold obtained in the second ...

Embodiment 2

[0059] The first step is to prepare the steel fiber cement slurry mixture

[0060] According to the mass ratio of water: cement: high-efficiency water reducer = 0.20:1:0.0075 to form cement slurry, add steel fiber with a volume content of 1.0% in the cement slurry, first mix the weighed mixing water and high-efficiency water reducer Put the water agent into the mixer, then put in the weighed cement and stir for 120 seconds, then slowly put in the weighed steel fiber while keeping the mixer continuously stirring, keep the mixer continuously stirring during the steel fiber feeding process, and continue to stir after the steel fiber feeding is completed After stirring for 300 seconds, the material is discharged, and the fluidity of the steel fiber cement slurry mixture is determined to be 90mm;

[0061] The second step, pouring into the test mold

[0062] Pour the steel fiber cement slurry mixture prepared in the first step into a non-metallic test mold of 40mm×40mm×160mm;

[0...

Embodiment 3

[0072] The first step is to prepare the steel fiber cement slurry mixture

[0073] According to the mass ratio of water: cement: high-efficiency water reducer = 0.35:1:0.004 to form cement slurry, in this cement slurry, add steel fiber with a volume content of 0.4%, first mix the weighed water and high-efficiency water reducer Put the water agent into the mixer, then put in the weighed cement and stir for 120 seconds, then slowly put in the weighed steel fiber while keeping the mixer continuously stirring, keep the mixer continuously stirring during the steel fiber feeding process, and continue to stir after the steel fiber feeding is completed After stirring for 300 seconds, the material is discharged, and the fluidity of the steel fiber cement slurry mixture is determined to be 135mm;

[0074] The second step, pouring into the test mold

[0075] Pour the steel fiber cement slurry mixture prepared in the first step into a non-metallic test mold of 40mm×40mm×160mm;

[0076] ...

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Abstract

The invention discloses a method and special equipment for preparing unidirectionally-distributed steel fiber reinforced cement paste and relates to fiber reinforced cement paste. The method comprises the following key steps of: pouring a prepared steel fiber cement paste mixture into a nonmetallic test mold and putting the test mold into a cavity in a framework of a coil of the special equipmentfor preparing the unidirectionally-distributed steel fiber reinforced cement paste; putting the coil and the test mold on a vibrating table of the special equipment; switching on a direct current power supply of the special equipment to electrify the coil so as to form a magnetic field; applying the magnetic field to the prepared steel fiber cement paste mixture so as to orient steel fiber; and keeping the direction of the magnetic field accordant with that of pulling stress during test piece testing or in a working state, wherein the special equipment consists of the vibrating table, the coil and the direct current power supply. Compared with steel fiber reinforced cement paste prepared by the conventional method, the unidirectionally-distributed steel fiber reinforced cement paste prepared by the method and the special equipment of the invention has breaking strength increased by 20 to 100 percent or saves the steel fiber by 25 to 60 percent.

Description

technical field [0001] The technical proposal of the present invention relates to fiber-reinforced cement slurry, in particular to a method for preparing unidirectionally distributed steel fiber-reinforced cement slurry and its special equipment. Background technique [0002] Cement slurry is widely used in construction engineering, and is generally used as repairing, grouting, plastering or leveling materials, such as prestressed hole grouting of post-tensioned prestressed cement slurry structure, cable-stayed bridge cable casing grouting, large-volume cement slurry hole Joint grouting, joint grouting of prefabricated assembled structures and crack repair and caulking, etc. The common characteristics of cement materials are high compressive strength, low tensile strength, small ultimate strain and high brittleness. Due to these characteristics, hardened cement slurry has poor toughness and is easy to crack, resulting in a decline in project quality. Adding steel fiber is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/087B28B1/52B28B11/24C04B28/00C04B14/48
Inventor 田稳苓慕儒赵全明白彦刚
Owner HEBEI UNIV OF TECH
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