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Evaluation of Use of Synthetic Lightweight Aggregate in Hot-Mix Asphalt

机译：轻质混合料在沥青混合料中的使用评价

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Successful use of synthetic lightweight aggregates made from waste fly ash and plastics can help in conserving mineral aggregates and reusing waste materials. The objective of this study was to evaluate the use of synthetic lightweight aggregate made from waste fly ash and plastics in hot-mix asphalt. The scope of this laboratory study included preparation of aggregate blends and mixes with different percentages of synthetic lightweight aggregates, compaction of samples, testing of samples, and analysis of results. Mixes were made with 0%, 5%, 10%, 15%, and 20% synthetic lightweight aggregates by weight of aggregates. Tests included bulk specific gravity, theoretical maximum density, resilient modulus, and indirect tensile strength at 25℃ on unconditioned and conditioned samples as well as rut testing with wheel tracking equipment at 60℃. Test results were analyzed statistically to determine the effect of synthetic lightweight aggregates on hot-mix asphalt properties. The results indicate that the inclusion of synthetic lightweight aggregates enhances stiffness and resistance against rutting and moisture-induced damage of hot-mix asphalt. A relatively high absorption was noted for mixes containing 20% synthetic lightweight aggregates. The main conclusions are that synthetic lightweight aggregate has excellent potential for being used as part of hot-mix asphalt, and 15% by weight of aggregate appears to be an optimum amount for use. Further work should be pursued to determine the effect of synthetic lightweight aggregate on low-temperature properties of hot-mix asphalt.
机译：成功地使用由废粉煤灰和塑料制成的合成轻质骨料可以帮助保存矿物骨料和回收利用废料。这项研究的目的是评估由废粉煤灰和塑料制成的合成轻质骨料在热拌沥青中的使用。该实验室研究的范围包括制备骨料混合物和具有不同百分比的合成轻质骨料的混合物，样品压实，样品测试和结果分析。用骨料重量计0％，5％，10％，15％和20％的合成轻质骨料制成混合物。测试包括在25℃下对未处理和处理过的样品的堆积比重，理论最大密度，弹性模量和间接拉伸强度，以及在60℃下使用车轮跟踪设备进行的车辙测试。对测试结果进行统计分析，以确定合成轻质骨料对热拌沥青性能的影响。结果表明，合成轻质骨料的加入增强了热混合沥青的刚度和抵抗车辙和水分引起的破坏的能力。对于含有20％合成轻质骨料的混合物，吸收率相对较高。主要结论是，合成轻质骨料具有极好的潜力，可以用作热拌沥青的一部分，并且以重量计15％的骨料似乎是最佳使用量。应该继续做进一步的工作以确定合成轻质骨料对热拌沥青的低温性能的影响。

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