复合冰材料单轴压缩性能试验

Uniaxial compression performance test of fiber-reinforced ice

摘要:

为解决纯冰在作为建筑材料时存在的强度低、脆性破坏等问题,采用原生纸浆纤维作为增强材料制备了一种复合冰材料.首先以-15 ℃为标准温度,对含有不同纤维质量（0%、1%、2%、4%、6%）的复合冰材料进行单轴压缩全过程试验研究,然后在-5 ℃下进行了相同工况的试验,探究温度对其性能的影响.研究表明:复合冰材料的强度和延性明显优于纯冰材料,纯冰的破坏属脆性破坏,复合冰的破坏属延性破坏,且变形能力相比纯冰大大增强；温度升高时,复合冰材料的强度、峰值应变和弹性模量均减小；纤维含量提高时,复合冰材料的强度和峰值应变增大,弹性模量减小.基于概率可靠度直接设计法确定了材料强度的标准值,所得结论为复合冰材料在建筑中的应用提供参考.

Abstract:

In order to solve the problems of low strength and brittle failure of fresh ice when used as building material, a kind of fiber-reinforced ice (FRI) material was prepared by using primary pulp fiber as reinforcing material. Firstly, the uniaxial compression tests were carried out for composite ice materials with different fiber contents (0%, 1%, 2%, 4%, 6%) at -15 ℃. To investigate the effects of temperature on the properties of the composite ice materials, tests were also carried out at -5 ℃ under the same conditions. The results show that the strength and ductility of the composite ice material were obviously better than fresh ice. Unlike the brittle failure of fresh ice, the failure of FRI was ductile failure, and the deformation ability was greatly enhanced compared with fresh ice. The strength, peak strain, and modulus of elasticity of the composite ice materials decreased with the increase of temperature, while the strength and peak strain of the composite ice materials increased with the increase of fiber content, and the elasticity modulus decreased. Based on the test results, the standard values of material strength were determined by the direct design method of probability reliability. The conclusions could provide reference for the application of composite ice materials in buildings.