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首页> 美国卫生研究院文献>Materials >Comparison of Long-Term Strength Development of Steel Fiber Shotcrete with Cast Concrete Based on Accelerator Type
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Comparison of Long-Term Strength Development of Steel Fiber Shotcrete with Cast Concrete Based on Accelerator Type

机译：基于加速器型铸造混凝土的钢纤维吸收长期强度发展的比较

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This study analyzed the effect of accelerating agents, such as aluminate, cement mineral, and alkali-free accelerators, on the long-term performance of steel-fiber-reinforced shotcrete. The shotcrete performance was studied based on the type and amount of steel fiber added. Performance tests were performed to identify the accelerator providing better long-term performance to the steel-fiber-reinforced shotcrete. Changes in strength and flexural performance over time were investigated. The compressive strength and flexural strength tests on 1-, 3-, 6-, 12-, and 24-month-old test specimens were performed, wherein 37 kg of steel fiber was added to the cement mineral and aluminate mixes, and 40 kg of steel fiber was added to the alkali-free mix. The 1-month compressive strength result of all the test variables satisfied the Korea Expressway Corporation standard. The compressive strength of the cast concrete and shotcrete specimens increased with age, demonstrating a strength reduction, particularly in the 24-month-old shotcrete specimens. Thus, the shotcrete performance may deteriorate in the long-term. In the 24-month-old specimen, substantial flexural strength reduction was observed, particularly in the aluminate and alkali-free specimens. The relative strength of the specimens was compared with that of the cast concrete mold specimens. The results suggest the use of alkali-free accelerators, considering the long-term performance of tunnels and safety of workers. Moreover, increasing the steel fiber performance rather than the amount of low-performance steel fiber must be considered.
机译：该研究分析了加速剂，例如铝酸盐，水泥矿物和碱性促进剂的效果，对钢 - 纤维增强喷射的长期性能。基于添加的钢纤维的类型和数量研究了喷射晶状动性能。进行性能测试以识别加速器，为钢纤维增强的喷射器提供更好的长期性能。调查了强度和抗弯性能的变化。进行1-，3-，6-，12-和24个月历史的试样上的抗压强度和抗弯强度试验，其中将37kg钢纤维加入到水泥矿物质和铝酸盐混合物中，40kg将钢纤维加入到无碱混合物中。所有测试变量的1个月压缩强度结果满足了韩国高速公路公司标准。铸造混凝土和吸管标本的抗压强度随着年龄的增长而增加，展示了强度减少，特别是在24个月历史的喷射晶样标本中。因此，喷射晶态的性能可能在长期恶劣。在24个月历史的标本中，观察到大量弯曲强度减少，特别是在铝酸盐和无碱标本中。将标本的相对强度与铸混凝土模具样本的相对强度进行比较。结果表明，考虑到隧道的长期表现和工人的安全性，使用无碱的加速器。此外，必须考虑增加钢纤维性能而不是低性能钢纤维的量。

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