Effect of ultra-low temperature on flexural properties of steel fiber reinforced rubber concrete
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摘要: 采用钢纤维和再生橡胶颗粒制备混凝土可以实现固废资源化利用并保证其良好的力学性能。本文针对超低温(低至−196℃)极端工况下钢纤维增强橡胶混凝土(SFRRC)抗弯性能演变开展研究,设计了7组不同配比的钢纤维增强橡胶混凝土梁式试件,经过低温深冷处理后进行四点弯曲试验,分析了超低温作用对钢纤维橡胶混凝土弯曲性能的影响,结果表明:常温下随着钢纤维和橡胶体积掺量的增加,SFRRC抗弯强度均会明显提升。随着温度的降低,钢纤维增强橡胶混凝土的弯拉强度有明显提升,当温度降低至−196℃时,其抗弯强度最大可提升151.6%;同时SFRRC在超低温环境下韧性会随着温度的降低而下降。研究成果为钢纤维橡胶混凝土的性能优化设计和在超低温工程中的应用提供支持。Abstract: The use of steel fibers and recycled rubber aggregate to prepare concrete can achieve the utilization of solid waste resources and ensure its good mechanical properties. In this paper, the flexural performance evolution of steel fiber reinforced rubber concrete (SFRRC) under the extreme conditions of ultra-low temperature (up to −196℃) was investigated, and seven groups of beam specimens with different ratios of steel fiber reinforced rubber concrete were designed to carry out four-point bending tests after low-temperature deep-cooling treatment to analyze the effect of ultra-low temperature on the flexural properties of SFRRC. It is demonstrated that with the increase of steel fiber and rubber volume admixture, the flexural strength of SFRRC is significantly increased at room temperature. As the temperature decreases, the bending and tensile strength of steel fiber reinforced rubber concrete is significantly improved, and when the temperature decreases to −196℃, its bending strength can be improved by 151.6%. Meanwhile the SFRRC toughness decreases in the ultra-low temperature environments. The research results provide support for the optimal design of steel fiber reinforced rubber concrete and its application in ultra-low temperature engineering.
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Key words:
- ultra-low temperature /
- steel fiber /
- rubberized concrete /
- bending performance /
- toughness
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表 1 镀铜微丝钢纤维性能指标
Table 1. Performance index of copper plated microfilament steel fiber
Type Density/(g·cm−3) Diameter/mm Length/mm Elastic modulus/GPa Tensile strength/MPa Copper plated micro wire steel fiber 7.8 0.25 13 200 ≥2850 表 2 橡胶颗粒性能指标
Table 2. Performance index of rubber particles
Type Mesh Apparent density /(kg·m-3) Bulk density/(kg·m-3) Average particle size /μm Rubber particles 80 1180 299 175 表 3 钢纤维橡胶混凝土配合比及试件分组
Table 3. Mix proportion of steel fiber rubber concrete and the grouping of test pieces
Specimen Volume fraction of
steel fiber/vol%Volume fraction of
rubber particle/vol%Steel fiber/
(kg·m−3)Rubber particle/
(kg·m−3)Fly ash/
(kg·m−3)Cement/
(kg·m−3)Sand/
(kg·m−3)Water/
(kg·m−3)NC 0 0 0 0 533.33 120 133.3 248 20%RC 0 20 0 0.24 0.5%SF-20%RC 0.5 20 0.16 0.24 1%SF-10%RC 1.0 10 0.31 0.12 1%SF-20%RC 1.0 20 0.31 0.24 1%SF-30%RC 1.0 30 0.31 0.36 1.5%SF-20%R 1.5 20 0.47 0.24 表 4 SFRRC平均弯拉强度试验值(MPa)
Table 4. Average flexural strength test value of SFRRC specimens (MPa)
Specimen 20℃ 0℃ −50℃ −100℃ −150℃ −196℃ NC 2.70 3.31 6.14 5.73 2.77 0.35 20%RC 2.24 1.95 4.91 10.39 5.82 5.13 0.5%SF-20%RC 2.28 4.84 10.39 14.02 11.87 12.76 1%SF-10%RC 2.96 2.46 6.35 4.98 7.22 6.38 1%SF-20%RC 4.36 4.57 8.00 10.98 8.67 10.18 1%SF -30%RC 4.51 4.87 8.35 14.95 9.76 9.13 1.5%SF -20%RC 7.06 3.68 8.81 18.91 14.82 17.43 -
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