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Design of Durable Concrete Railroad Crossings

机译:耐久性混凝土平交道口的设计

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摘要

Existing precast concrete railroad crossings in the state of Indiana are experiencing too short a life expectancy. This study proposes methods that can be used to produce durable concrete railroad crossings with satisfactory rideability, durability, and longevity. Thirty-two precast concrete railroad crossings were visited in central and northern Indiana. Failures were determined to belong to three major categories: structural capacity causes, environmental causes, and material property causes. A concrete mix was evaluated at three different polyolefin fiber contents and without fibers. Beams were tested in flexure, and modulus of rupture and first crack deflection were recorded for each beam. Cylinders were cast for compressive testing and splitting tensile testing. Modulus of rupture was increased by the addition of fibers. The spread in data was observed to increase with an increase in fiber content. Compressive strength and splitting tensile strength were increased slightly by the addition of fibers. Panels are currently being produced that utilize post tensioning. These panels are less likely to crack under extreme loading conditions. If a crack forms, it closes upon removal of the load.
机译:印第安纳州现有的预制混凝土平交道口的预期寿命太短。这项研究提出了可用于生产具有令人满意的可乘性,耐久性和寿命的耐用混凝土铁路道口的方法。在印第安纳州中部和北部参观了32条预制混凝土平交道口。确定故障的原因可分为三大类:结构能力原因,环境原因和材料属性原因。在三种不同的聚烯烃纤维含量和不含纤维的情况下评估了混凝土混合物。对梁进行了挠曲测试,并记录了每个梁的断裂模量和首次裂纹挠度。铸造圆柱体用于压缩测试和分裂拉伸测试。纤维的添加增加了断裂模量。观察到数据的传播随着纤维含量的增加而增加。通过添加纤维,抗压强度和劈裂抗张强度略有增加。当前正在生产利用后张紧的面板。这些面板在极端负载条件下不太可能破裂。如果形成裂纹,则在移除负载后会闭合。

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