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首页> 外文期刊>The international journal of pavement engineering & asphalt technology >COMPARISON STUDY BETWEEN LIME APPLICATION METHODS ON HMA ASPHALT CONCRETE IN IRAQ
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COMPARISON STUDY BETWEEN LIME APPLICATION METHODS ON HMA ASPHALT CONCRETE IN IRAQ

机译：伊拉克HMA沥青混凝土石灰施用方法的比较研究。

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Iraq has been experiencing tremendous development in the national infrastructure road network over the last decade. Iraqi economic growth in rural areas has been triggered by good and safe roads and a good highways network system. Studies have shown that climate, traffic conditions, characteristics of the asphalt binder and the aggregate are the main factors that can contribute to premature pavement failures. The ability of hydrated lime to improve the fatigue and rutting resistance of Hot Mix Asphalt (HMA) as well as moisture sensitivity, has led to observed improvement in the field of lime modified HMA pavements, and significant decreases in maintenance and repair costs of the highway network. In this study, the mechanistic properties of asphalt concrete mixes modified with hydrated lime as a partial replacement for limestone dust mineral filler were evaluated. Four replacement rates were used; 1, 1.5, 2, and 3 percent by weight of aggregate beside two kinds of addition methods, namely dry and wet. Asphalt concrete mixes were prepared at their optimum asphalt content and then tested to evaluate their engineering properties which include moisture damage, resilient modulus, and permanent deformation and fatigue characteristics. These properties have been evaluated using indirect tensile strength, uniaxial repeated loading and repeated flexural beam tests. The experimental results, in general, showed that the mixes modified with hydrated lime were found to have improved fatigue and permanent deformation characteristics, also showing lower moisture susceptibility and higher resilient modulus. The use of 1.5 percent of hydrated lime in the wet addition method as a replacement for limestone dust mineral filler has shown a significant improvement in asphalt concrete behavior and has added to the local knowledge the possibility of producing more durable mixtures with higher resistance to distress.
机译：伊拉克在过去十年中一直在国家基础设施道路网中取得巨大发展。良好和安全的道路以及良好的公路网络系统已触发了伊拉克农村地区的经济增长。研究表明，气候，交通状况，沥青结合料和骨料的特性是导致过早路面破坏的主要因素。熟石灰改善热拌沥青（HMA）的抗疲劳和车辙的能力以及对湿气的敏感性，已导致石灰改性的HMA路面领域的改善，并显着降低了公路的养护和维修成本网络。在这项研究中，评估了用熟石灰改性的沥青混凝土混合物的机械性能，以部分替代石灰石粉尘矿物填料。使用了四个替换率；除干法和湿法两种添加方法外，骨料的重量百分比分别为1、1.5、2和3％。以最佳沥青含量制备沥青混凝土混合物，然后进行测试以评估其工程性能，包括湿气损害，弹性模量以及永久变形和疲劳特性。这些性能已使用间接拉伸强度，单轴重复载荷和反复弯曲梁测试进行了评估。通常，实验结果表明，用熟石灰改性的混合物具有改善的疲劳和永久变形特性，还显示出较低的湿气敏感性和较高的弹性模量。在湿法添加方法中使用1.5％的熟石灰代替石灰石粉尘矿物填料，已显示出沥青混凝土性能的显着改善，并为当地知识增添了生产具有更高抗压强度的更耐用混合物的可能性。

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