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首页> 外文期刊>Journal of materials in civil engineering >Structural Evaluation of Flexible Pavement Constructed with Steel Slag-Fly Ash-Lime Mix in the Base Layer
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Structural Evaluation of Flexible Pavement Constructed with Steel Slag-Fly Ash-Lime Mix in the Base Layer

机译：基层钢渣 - 粉煤灰 - 石灰混合构造柔性路面的结构评价

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摘要

The concept of utilizing industrial wastes for road construction can be materialized only by evaluating the field performance of roads constructed with these wastes. The present study encompasses the laboratory investigation of steel slag-fly ash-lime (SFL) mix substantiated by field evaluation of flexible pavement test sections constructed with SFL mix in the base layer. Based on grain size analysis and unconfined compressive strength (UCS) test, 75% steel slag + 19% fly ash + 6% lime mix was chosen as a potential replacement for wet mix macadam (WMM) in the base layer of flexible pavement. The UCS test results were supported by the shear strength parameters and resilient moduli of optimum SFL mix. The superior stiffness characteristics of the SFL mix obtained in laboratory investigation were validated with a detailed structural evaluation of flexible pavement test sections constructed with 150 and 250 mm thick SFL base. Stiffness-based quality control approach was adopted during the construction of test sections through light weight deflectometer (LWD). SFL base layers exhibited higher in situ stiffness when compared to that of WMM. From the structural evaluation of test sections with falling weight deflectometer (FWD), sections with SFL base layer exhibited lower peak deflections than that of conventional WMM. The back-calculated elastic modulus computed from FWD test for SFL base layers was more than five times that of WMM. Furthermore, test sections with SFL base layer showed a service life ratio up to 2.6 and a notable cost saving up to 15% compared to conventional WMM layer.
机译：利用工业废物用于道路结构的概念，只能通过评估由这些废物构建的道路的场地性能来实现。本研究包括由柔性路面试验部分的场评价所证实的钢渣 - 粉煤灰 - 石灰（SFL）混合物的实验室调查。基于晶粒尺寸分析和无束缚的抗压强度（UCS）试验，75％钢渣+ 19％飞灰+ 6％石灰混合物作为柔性路面基部湿混合型麦唑（WMM）的潜在替代品。 UCS测试结果由最佳SFL混合的剪切强度参数和弹性模态支持。在实验室调查中获得的SFL混合物的优异刚度特性通过150和250mM厚的SFL碱构成的柔性路面试验部分的详细结构评估。通过轻量级偏转仪（LWD）在试验部分施工过程中采用刚度基于基于刚度的质量控制方法。与WMM相比，SFL基层在原位刚度上表现出更高。从具有下降重量偏转仪（FWD）的试验部分的结构评估，具有SFL基层的截面表现出比常规WMM的峰值偏转。从FWD测试的SFL基层计算的后计算的弹性模量大于WMM的五倍以上。此外，与传统的WMM层相比，具有SFL基础层的测试部分显示出高达2.6的使用寿命比，显着的成本高达15％。

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