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首页> 外文期刊>Journal of materials in civil engineering >Petrographic Investigation into the Influence of Chopped Basalt Fibers on the Microstructure of Portland Cement Mortars at Elevated Temperatures
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Petrographic Investigation into the Influence of Chopped Basalt Fibers on the Microstructure of Portland Cement Mortars at Elevated Temperatures

机译：切碎玄武岩纤维对高温下波特兰水泥砂浆微观结构影响的岩化研究

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摘要

This research investigated the effects of usage of basalt fiber (BF) in cement mortars at elevated temperatures. Compressive strength, mass loss, and microstructure characteristics, including petrographic analyses and scanning electron microscopy (SEM) images of cement composites, were investigated. BF was added in the mortars at five different ratios: 0%, 0.5%, 1 %, 1.5%, and 2% by volume of the mix. The mortars were subjected to temperatures of 23°C, 200°C, 400°C, 600°C, and 800°C. The mixture with 1% BF had the best residual compressive strength at high temperatures, so that is considered to be the optimum dosage. The lowest amount of mass loss at each temperature was for specimens with 2% BF. The results indicate that adding BF to the mixes decreased the mass loss. Petrographic and SEM images showed that with increasing temperature, the part of the microstructure which began to deteriorate first was the interfacial transition zone between cement matrix and fiber. BF has a significant function in spreading the cracks, and acts like bridge between two parts of cement paste.
机译：本研究研究了玄武岩纤维（BF）在水泥砂浆中升高温度的影响。研究了抗压强度，质量损失和微观结构特性，包括岩体分析和扫描电子显微镜（SEM）水泥复合材料的图像。 BF以五种不同的比例在砂浆中加入：0％，0.5％，1％，1.5％和2重量体积。将砂浆进行23℃，200℃，400℃，600℃和800℃的温度。具有1％BF的混合物在高温下具有最佳的残余抗压强度，因此被认为是最佳剂量。每个温度的最低质量损失是具有2％BF的样品。结果表明，向混合物中添加BF降低质量损失。岩体和SEM图像显示，随着温度的增加，首先开始恶化的微观结构的一部分是水泥基质和纤维之间的界面过渡区。 BF在扩散裂缝方面具有显着的功能，并使水泥膏两部分之间的桥接作用。

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