Formula and preparation technology for domestic polypropylene fiber cement-based material

A polypropylene fiber and cement-based material technology, applied in the field of large-deformation cement-based composite materials, can solve problems such as reducing production efficiency and prolonging mixing time, and achieve the effects of preventing local agglomeration, prolonging mixing time, and reducing costs.

Inactive Publication Date: 2020-01-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in order to ensure that the fibers are fully and evenly dispersed in the mixture, people have to greatly prolong the stirring time, which reduces the production efficiency

Method used

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  • Formula and preparation technology for domestic polypropylene fiber cement-based material
  • Formula and preparation technology for domestic polypropylene fiber cement-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 670g cement and 450g fly ash and dry mix for 30s, add 280g water and stir quickly for 2min. Turn the mixer to slow speed, divide 13g fiber into the clean slurry in three times, then add 4g water reducing agent, and stir rapidly for 5 minutes. Set the mixer to slow speed, add 500g of fine sand to the mixture, then add 4g of water reducing agent and 20g of water, and stir rapidly for 5 minutes.

[0025] The mixed mixture is poured into a 15mm×100mm×400mm test mold for molding, demolded after 24 hours and put into a standard curing room for health preservation.

[0026] Cement: 42.5 grade ordinary Portland cement produced by a factory in Changchun is used.

[0027] Fly ash: First-class fly ash produced by a factory in Henan is used.

[0028] Sand grains: Ultra-fine river sand with a maximum grain size of 0.3 mm is used.

[0029] Fiber: Polypropylene monofilament fiber produced by a factory in Hubei, with a diameter of 38 μm and a length of 12 mm.

[0030] Water re...

Embodiment 2

[0039]Take 560g of cement and 560g of fly ash and dry mix for 30s, add 280g of water and stir quickly for 2min. Turn the mixer to slow speed, divide 15g fiber into the clean slurry in three times, then add 4g water reducer, and stir rapidly for 5 minutes. Set the mixer to slow speed, add 500g of fine sand to the mixture, then add 4g of water reducer and 10g of water, and stir rapidly for 5 minutes.

[0040] The mixed mixture is poured into a 15mm×100mm×400mm test mold for molding, demolded after 24 hours and put into a standard curing room for health preservation.

[0041] Cement: 42.5 grade ordinary Portland cement produced by a factory in Changchun is used.

[0042] Fly ash: First-class fly ash produced by a factory in Henan is used.

[0043] Sand grains: Ultra-fine river sand with a maximum grain size of 0.6 mm is used.

[0044] Fiber: Polypropylene monofilament fiber produced by a factory in Beijing, with a diameter of 30 μm, a length of 12 mm, a Y-shaped cross-section,...

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Abstract

The invention discloses a formula and a preparation technology for a domestic polypropylene fiber cement-based material. The formula is prepared from the components in parts by weight: 560-670 parts of cement, 450-560 parts of coal ash, 450-550 parts of fine sand, 13-17 parts of polypropylene fibers, 6-8 parts of a superplasticizer and 290-315 parts of water. The preparation technology includes the following steps that firstly, the cement and the coal ash are mixed and then stirred at a low speed for 30 s, part of the water are added to make the water-cement ratio about 0.25, then the mixtureis rapidly stirred for 2 min, thus neat paste can be thickened fully, secondly, the fibers are added into the neat paste in low-speed stirring in three times, part of the water reducer is added to improve the instantaneous fluidity of the mixture, then the mixture is rapidly stirred for 5 min to fully disperse the fibers, and finally, the sand, the remaining water and the water reducer are successively added into the mixture and stirred rapidly for 5 min to prepare for pouring and forming. According to the formula and the preparation technology, large-deformation cement-based materials with typical characteristics of multi-seam cracking and deformation hardening can be prepared, an improved preparation method is provided, and the problems of difficult stirring and long stirring time of ultra-high toughness synthetic fiber reinforced concrete are solved.

Description

technical field [0001] The invention relates to a key technology of a large-deformation cement-based composite material with deformation hardening and multi-slit cracking characteristics prepared by using domestic polypropylene fiber, specifically, it relates to a formula and preparation technology of a domestic polypropylene fiber cement-based material . Background technique [0002] The "functionalization" and "composite" of cement-based materials have become an important direction of modern concrete research. Ultra-high toughness synthetic fiber reinforced cement-based materials are one of the emerging functional concrete materials. They are used in the field of road and bridge construction materials. It has great application potential. One of the advantages of this fiber-reinforced cement-based material over conventional concrete materials is its excellent crack control capabilities. Usually cement-based materials are difficult to limit the expansion of initial cracks,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/08C04B14/06C04B16/0633C04B2103/302Y02W30/91
Inventor 谭国金朱志清吴春利宫亚峰马桂荣毕海鹏周培蕾孔庆雯姜霖欧吉杨正赵宇朱德祺王英涵
Owner JILIN UNIV
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