聚丙烯纤维混凝土250℃热不稳定性试验研究

Assia Aidoud, M. Bencheikh, N. Khaldi
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引用次数: 0

摘要

混凝土中的高温破坏了水泥浆体中的水化物。这种破坏是指由于材料机械性能的恶化而造成的材料的薄弱。本工作旨在研究高性能纤维混凝土在高温下的性能;具体来说,我们使用聚丙烯纤维,研究其对劣化行为的影响。本研究包括高性能混凝土和三种纤维混凝土,每种混凝土含有特定比例的聚丙烯纤维(0.12%,0.18%和0.24%)。因此,立方体试样(15 cm x 15 cm x 15 cm)承受250℃的温度,速度为2°C/min,在目标温度下进行1小时的步骤,然后冷却到环境温度。结果表明,纤维增强混凝土在温度作用下表现出较好的性能。抗压强度提高了56%,抗拉强度提高了86%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental Research on the Thermal Instability of Fiber Polypropylene Concrete at 250 °C
Abstract The high temperature in the concrete destroys the hydrates of the cement paste. This destruction means the weakness of the materials caused by the deterioration of their mechanical properties. This work aims to study the behavior of high-performance fiber concrete sets at high temperatures; specifically, we used polypropylene fibers and studied their influence on deterioration behavior. This study includes high performance concrete and three types of fiber concrete, each containing a specific ratio of polypropylene fibers (0.12 %, 0.18 %, and 0.24 %). Consequently, cubic test specimens (15 cm x 15 cm x 15 cm) were subjected to the temperature of 250 °C, with a speed of 2 °C/min followed by a step of one hour at the target temperature then cooling to the ambient temperature. The results showed that fiber-reinforced concrete exhibited a better performance when exposed to the temperature studied. The mechanical properties were improved by up to 56% for compressive strength and 86% for tensile strength.
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