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

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...

AI Technical Summary

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 strongly alkaline material, and the cement generates Ca(OH) during hydration. 2 , so that the concrete contains a large amount of hydroxide ions, and its pH value can reach 12-14, while the plant fiber is in a strong alkali environment, the breaking strength of the fiber decreases and the softness increases, and the bonding force between the fiber and cement-based concrete Low, affecting the durability of concrete, resulting in a decrease in the compactness of concrete, poor chlorine resistance, crack resistance and load-bearing

Images