High temperature performance of recycled fine concrete
Abstract
Abstract The objective of this study is to explore the physical and mechanical behaviour of concretes comprising four different ratios of recycled fine (RF), namely (5%, 10%, 15% and 20%) along with that of a reference concrete (Cref-0%), under three different heating–cooling cycles (200 °C, 400 °C and 600 °C). The thermal properties of concrete during heating and cooling (20 °C – 600 °C – 20 °C) were also investigated. It was determined that the physical properties (mass loss and ethanol porosity) of recycled concrete (RC) with 5% of recycled fine (RC-5%) were similar to those of Cref-0%. At ambient temperatures, the higher the ratio of recycled fines, the lower the residual compressive strength and residual elastic modulus of the recycled concrete. After thermal loading at 600 °C, the residual mechanical properties of all types of concrete were equivalent, regardless of the content recycled fine.
Keywords
High temperatures Recycled concrete Thermal properties Residual mechanical properties 摘要 本研究的目的是探索四种不同再生细骨料(RF)取代率5% 10% 15%和20%)的混凝土以及参照组混凝土(Cref-0 ％)在三种不同加热-冷却循环温度下(200℃ 400℃和600℃)的物理和力学性能。研究还分析了再生细骨料 混凝土在加热和冷却(20℃-600℃-20℃)过程中的热学性能。结果表明 含5%再生细骨料(RC-5%)的再生混凝 土(RC)的物理性能(质量损失和孔隙率)与参照组混凝土(Cref-0％)相近。在室温下 再生细骨料掺量越高 再生混凝土的残余抗压强度和残余弹性模量越低。在600℃热载荷后 所有种类的混凝土的残余力学性能均 相当 且与再生细骨料掺量无关。 关键词 高温 再生混凝土 热学性能 残余力学性能
High temperatures
Recycled concrete
Thermal properties
10%
TRM Residual High temperature Cracking DIC
Domains
Engineering Sciences [physics]
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