Filled plant fiber, preparation method thereof, and high-strength plastic wave-absorbing concrete

A plant fiber, filling technology, applied in the field of composite materials, can solve the problems affecting the durability of concrete, the decrease of fiber breaking strength, chlorine resistance, crack resistance and poor load-bearing capacity, so as to avoid the decrease of breaking strength and maintain the breaking strength. , to ensure the effect of adhesion

Inactive Publication Date: 2020-09-01
中铁二局第二工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The halite, gypsum, and anhydrite in the surrounding rock behind the secondary lining are dissolved in groundwater and easily form cavities and fissures, resulting in further fragmentation, disintegration and even instability of the surrounding rock mass, and the reduction of strength and self-stability. The surrounding pressure of the secondary lining increases, and the secondary lining resists the surrounding rock pressure for a long time, which will cause deformation and damage
[0006] However, cement-based concrete is a str

Method used

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  • Filled plant fiber, preparation method thereof, and high-strength plastic wave-absorbing concrete

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preparation example Construction

[0026] The invention provides a preparation method of filling plant fiber, which comprises the following steps: after soaking the plant fiber in an alkali-resistant filler dispersion liquid, taking it out for cooling, drying and cutting to obtain the filling plant fiber. The alkali-resistant filler solution is poured into the inner cavity of the plant fiber, and then the bonding force between the alkali-resistant filler and the inner cavity of the plant fiber is accelerated under cooling and drying procedures. Since the plant fiber is a long section of fiber, the fiber is cut into short-cut fiber, which is conducive to improving the bonding force between the filling fiber and the cement-based cementitious material, and improving the strength of the concrete. It should be noted that it has been verified by experiments that during the process of soaking the plant fibers in the alkali-resistant filler dispersion, due to the capillary phenomenon inside the fibers, the alkali-resist...

Embodiment 1

[0037] The utility model relates to a filling plant fiber, which uses a hollow tubular plant fiber as a wall material and an alkali-resistant filler as a core material. Hollow tubular plant fibers can be selected from A: sisal fiber, B: ramie fiber, C: bamboo fiber, D: palm fiber, E: coconut shell fiber; alkali-resistant fillers can be selected from a: styrene-acrylic emulsion, b: bentonite, c : silica fume, d: polyethylene acetate, e: styrene-acrylic emulsion and epoxy resin, f: fly ash; g: silica fume; its preparation method is that the plant fiber is put into a 50% resistant After soaking in the alkaline filler dispersion, the ratio of solid to liquid is 1:6, the soaking time is 50min, and the soaking temperature is 30°C. After natural cooling at room temperature, put it in a hot air drying oven to dry, and then cut into 10mm chopped fibers.

Embodiment 2

[0039] A high-strength plastic wave-absorbing concrete, the components are calculated by weight ratio, including: 35 parts of filled plant fibers prepared in Example 1, 275 parts of low-heat cement, 135 parts of fly ash, and 25 parts of calcium sulfoaluminate type expansion Agent, 750 parts of sand, 1000 parts of crushed stone, 6.0 parts of polycarboxylate superplasticizer, 0.55 parts of TY-YQ air-entraining agent and 150 parts of water. The hollow tubular plant fiber is selected from A: sisal fiber, and the alkali-resistant filler is selected from a: styrene-acrylic emulsion.

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Abstract

The invention discloses a filled type plant fiber. The filled plant fiber takes a hollow tubular plant fiber as a pipe and an alkali-resistant filler as a core material. A preparation method of the filled plant fiber comprises the following steps: soaking the plant fiber in an alkali-resistant filler dispersion, taking out the plant fiber, cooling, drying, and cutting to obtain the filled plant fiber. A high-strength plastic wave-absorbing concrete is prepared from, by weight, 20 to 50 parts of the filled plant fiber, 200 to 300 parts of cement, 100 to 150 parts of coal ash, 20 to 50 parts ofan expanding agent, 700 to 800 parts of sands, 950 to 1100 parts of gravel, 5.8 to 6.8 parts of a water reducing agent, 0.35 to 0.70 part of an air entraining agent and 120 to 180 parts of water. Thefilled plant fiber is good in alkali resistance, good in pressure resistance and high in breaking strength, the bonding force between the filled plant fiber and a cement-based cementing material can be improved, and then the compactness, stability and durability of the concrete are improved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a filling plant fiber, a preparation method and high-strength plastic wave-absorbing concrete. Background technique [0002] During the construction of some tunnels, rock-salt formations were discovered, which contained high chloride salts, and the seepage water in the tunnels had a high concentration of chloride ions. The halite is a soluble chemical sedimentary rock, which has the characteristics of dissolution and chemical erosion. It has strong karst characteristics when it encounters water. At the same time, the groundwater solution in the salt rock area generally has different degrees of chemical erosion to the reinforced concrete structure of the tunnel project. . [0003] When the lining cracking tunnel project is located in the sandy mudstone stratum interlayered with rock salt, gypsum and anhydrite, after the construction of the project, the gro...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B20/02C04B20/10C04B18/26C04B18/24C04B18/14C04B14/36C04B14/30C04B111/20
CPCC04B20/023C04B20/1033C04B20/1037C04B20/1066C04B20/1074C04B20/1077C04B28/025C04B2111/00724C04B2111/20C04B2201/50C04B2201/52C04B18/08C04B22/142C04B14/06C04B14/02C04B2103/302C04B2103/304C04B18/248C04B18/26C04B18/146C04B14/308C04B14/368Y02W30/91
Inventor 左洲明袁善文杨世忠向敏李锋刚白小可高金华吴华刘志韬李忠孙涛
Owner 中铁二局第二工程有限公司
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