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A kind of spray-type ductile PP fiber reinforced cement-based 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. Low operating environment, good toughness and stable mechanical properties

Inactive Publication Date: 2016-05-04
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of spray-type ductile PP fiber reinforced cement-based composite material and preparation method thereof

Examples

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 stone (particle size 5-10mm), 12 parts of water, 0.2 parts of powdered water reducing agent, 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 are as follows in parts by weight:

[0029] (1) One-time mixing: Add redispersible latex powder, powdery water reducer, rubber powder and PP fiber into the mixer for dry mixing. The mixing time is 2 minutes until the four base materials are mixed evenly; The material is packed into bags, and the bagged mixture is obtained, which is transported to the construction site for use;

[0030] (2) Secondary mixing: Take the bagged mixture obtained in step (1), add cement, fly ash, river sand and stones, put it into the first screw mixer, mix and t...

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 (5-10mm in size), 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 are as follows in parts by weight:

[0036] (1) One-time mixing: Add redispersible latex powder, powdery water reducer, rubber powder and PP fiber into the mixer for dry mixing. The mixing time is 3 minutes until the four base materials are evenly mixed; The material is packed into bags, and the bagged mixture is obtained, which is transported to the construction site for use;

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

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 stone (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 parts of accelerator.

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

[0043] (1) One-time mixing: Add redispersible latex powder, powdery water reducer, rubber powder and PP fiber into the mixer for dry mixing. The mixing time is 3 minutes until the four base materials are evenly mixed; The material is packed into bags, and the bagged mixture is obtained, which is transported to the construction site for use;

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

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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 in soft rock support projects such as mine roadways, railway road tunnels, and subway tunnels, and a preparation method thereof, in particular to a spray-type ductile fiber-reinforced cement-based composite material and its preparation method. The preparation method belongs to the technical field of building materials. Background technique [0002] The theory of ductile fiber concrete materials was first proposed by Professor Victor C.Li of the University of Michigan in the United States and Professor Christopher K.Y.Leung of the Massachusetts Institute of Technology in 1992. It was the first attempt to use polyethylene fibers (Polyethylene, PE for short) to solve cement-based composite materials. Strengthening and toughening problems. In 1997, Victot.C.Li and others began to use PVA for ECC, and made polyvinyl alcohol (PolyvinylAlcohol, PVA for short) fiber-reinforced ce...

Claims

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Application Information

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Patent Type & Authority Patents(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