A high-strength, high-toughness, low-viscosity modified ECC concrete sound barrier board and its preparation method

Abstract

The invention discloses a high-strength, high-toughness and low-viscosity modified ECC concrete sound barrier plate and a preparation method of the sound barrier plate. The sound barrier plate consists of a concrete unit plate and a pottery sand concrete sound absorption layer which covers a sound facing area of the concrete unit plate, wherein the concrete unit plate is prepared from the following components: cement, fly ash, a microbead, silicon ash, quartz sand, a water reducing agent, a PVA fiber, a steel fiber and water at a weight ratio of 1:(0.05-0.15):(0.05-0.15):(0.25-0.35):1.3:(0.05-0.08):(0.005-0.01):(0.2-0.25):(0.20-0.25); the pottery sand concrete sound absorption layer is prepared from the following components: cement, fly ash, a microbead, silicon ash, pottery sand, quartz sand, a water reducing agent, a PVA fiber, a steel fiber and water at a weight ratio of 1:(0.05-0.15):(0.05-0.15):(0.25-0.35):(0.2-0.25):1.3:(0.05-0.08):(0.005-0.01):(0.2-0.25):(0.20-0.25). The modified ECC concrete sound barrier plate is low in viscosity, high in strength and high in toughness, can be used for pouring a sheet concrete sound barrier unit, and overcomes the defects of heavy load and excessive transport and mounting cost.

Description

technical field [0001] The invention relates to the technical field of sound barriers, in particular to a high-strength, high-toughness and low-viscosity modified ECC concrete sound barrier plate and a preparation method thereof. Background technique [0002] According to "Hong Kong Rail Transit Experience and Enlightenment" ("Urban and Regional Planning Research", Ouyang Nanjiang, Chen Zhongping, Yang Jingsheng), the experience of Hong Kong rail transit thick-walled concrete sound barriers shows that its sound insulation effect is very good, and the concrete The amount of maintenance and repair is small, and the cost is low. However, when it is used in the fully enclosed sound barrier of high-speed railway, it is technically difficult, and a series of problems such as material performance, structural structure, aerodynamic force, and structural vibration need to be solved. At present, the concrete cover plate of the sound barrier needs to be made of high-strength, high-tou...

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Problems solved by technology

[0003] However, the existing sound barrier materials have the following deficiencies: (1) the existing ordinary concrete structure has very small ultimate tensile strain, low tensile strength, easy cracking, and poor impact toughness; (2) the tensile strength of reactive powder concrete (RPC) The compressive strength is very high, but the brittleness is large when the size is small; (3) Fiber reinforced lightweight aggregate concrete is used as the cover material, which can reduce the weight of the sound barrier by about 12%, but the tensile strength of the cover material is low, and the toughness is not ideal (4) Ordinary high-performance fiber concrete usually uses a large volume of steel fiber, which is costly, heavy, and difficult to construct, and it is difficult to control the crack width within a few hundred microns, especially when the strain exceeds 1.5 % basically no longer control the crack width

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