Ejection type ductile PP fiber strengthened cement base composite material and preparation method thereof

A fiber-reinforced cement and composite material technology is applied in the field of fiber-reinforced cement-based composite materials and their preparation, and in the field of spray-type ductile fiber-reinforced cement-based composite materials and their preparation. The effect of low operating environment, strong toughness and low price

Inactive Publication Date: 2014-01-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the current support method, the roadway has been repeatedly damaged during the service period and needs to be repaired several times (according to statistics from the Datun mining area in Jiangsu and the Huaibei mining area in Anhui, the annual repair fee per meter of roadway needs to be more than 2,000 yuan). The annual repair cost of the mining roadway is as high as 3.6 billion yuan, which seriously affects the normal production of the mine and the economic development of the enterprise

Method used

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  • Ejection type ductile PP fiber strengthened cement base composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 23.5 parts of cement, 2.5 parts of rubber powder, 22 parts of fly ash, 20 parts of river sand (M=2.5-3.2), 15 parts of stones (particle size 5-10mm), 12 parts of water, 0.2 parts of powdered water reducer, 1.8 parts of redispersible latex powder, 1.5 parts of polypropylene fiber, and 1.5 parts of accelerator.

[0028] The preparation method of the spray-type ductile PP fiber-reinforced cement-based composite material, the steps by weight are as follows:

[0029] (1) One-time stirring: add redispersible latex powder, powdery water reducing agent, rubber powder and PP fiber into the mixer for dry stirring, the stirring time is 2 minutes, until the four base materials are stirred evenly; Bag the material, get the bagged mixture, and transport it to the construction site for use;

[0030] (2) Secondary stirring: take the bagged mixture obtained in step (1), add cement, fly ash, river sand and stones, put it into the first screw mixer, stir and transport it to the second sc...

Embodiment 2

[0034] 27 parts of cement, 1.9 parts of rubber powder, 26 parts of fly ash, 23.5 parts of river sand (M=2.5-3.2), 10 parts of stones (particle size 5-10mm), 7 parts of water, 0.2 parts of powdered water reducer, 1.6 parts of redispersible latex powder, 1.2 parts of polypropylene fiber, and 1.6 parts of accelerator.

[0035] The preparation method of the spray-type ductile PP fiber-reinforced cement-based composite material, the steps by weight are as follows:

[0036] (1) One-time stirring: Add the redispersible latex powder, powdery water reducing agent, rubber powder and PP fiber into the mixer for dry stirring, the stirring time is 3 minutes, until the four base materials are stirred evenly; Bag the material, get the bagged mixture, and transport it to the construction site for use;

[0037] (2) Secondary stirring: take the bagged mixture obtained in step (1), add cement, fly ash, river sand and stones, put it into the first screw mixer, stir and transport it to the second...

Embodiment 3

[0041] 22 parts of cement, 3 parts of rubber powder, 25.6 parts of fly ash, 19 parts of river sand (M=2.5-3.2), 14 parts of stones (particle size 5-10mm), 13 parts of water, 0.1 part of powdered water reducer, 1 part of redispersible latex powder, 1 part of polypropylene fiber, 1.3 part of accelerator.

[0042] The preparation method of the spray-type ductile PP fiber-reinforced cement-based composite material, the steps by weight are as follows:

[0043] (1) One-time stirring: Add the redispersible latex powder, powdery water reducing agent, rubber powder and PP fiber into the mixer for dry stirring, the stirring time is 3 minutes, until the four base materials are stirred evenly; Bag the material, get the bagged mixture, and transport it to the construction site for use;

[0044] (2) Secondary stirring: take the bagged mixture obtained in step (1), add cement, fly ash, river sand and stones, put it into the first screw mixer, stir and transport it to the second screw mixer,...

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Abstract

The invention relates to an ejection type ductile fiber strengthened cement base composite material and a preparation method thereof, and belongs to the technical field of construction material. The composite material formula comprises the following raw materials in parts by weight: 19 to 36 parts of cement, 1.9 to 5.7 parts of rubber powder, 11 to 40 parts of fly ash, 12 to 35 parts of river sand, 10 to 30 parts of stone, 7 to 18 parts of water, 1 to 2.2 parts of accelerator, 0.1 to 0.8 part of powder water reducer, 1 to 1.8 parts of redispersible latex powder, and 0.8 to 2 parts of PP fiber. The ejection type ductile PP fiber strengthened cement base composite material is prepared through following steps: primary stirring, secondary stirring, and final set. The invention provides a fiber strengthened cement base composited material, which has the advantages of low cost, simple processing, low requirements on processing technology and operation environment, and stable mechanical properties, and a preparation method thereof.

Description

technical field [0001] The invention relates to a fiber-reinforced cement-based composite material used for soft rock supporting projects such as mine roadways, railway highway tunnels, subway tunnels and the like and a preparation method thereof, in particular to a spray-type ductile fiber-reinforced cement-based composite material and the same The preparation method belongs to the technical field of building materials. Background technique [0002] The theory of ductile fiber reinforced concrete material was first proposed by Professor Victor C. Li of the University of Michigan and Professor Christopher K. Y. Leung of the Massachusetts Institute of Technology in 1992. The earliest attempt was to use polyethylene fibers (Polyethylene, referred to as PE) to solve the problem. Strengthening and toughening of cement-based composites. In 1997, Victot. C. Li et al. began to use PVA for ECC, and made polyvinyl alcohol (Polyvinyl Alcohol, PVA for short) fiber-reinforced cement-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B16/06C04B18/08C04B14/02
CPCY02W30/91
Inventor 毕远志姜勇张大林华渊贡鸣
Owner JIANGNAN UNIV
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