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首页> 外文期刊>Journal of Civil Engineering and Science >Determination of the Optimum Lime Content for Asphalt Concrete Using Marshall Mix Design
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Determination of the Optimum Lime Content for Asphalt Concrete Using Marshall Mix Design

机译：用马歇尔混合设计确定沥青混凝土的最佳石灰含量。

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This study evaluates asphalt concrete with and without hydrated lime using the Marshall mix design method with the aim of determining the optimum amount of lime required to modify the asphalt concrete. The hydrated lime was added by the dry method to the aggregates blend of asphalt mix with different percentages of hydrated lime (1.0 - 8.0 %) and the bitumen content ranged from 5.5% to 7.5%. The optimum binder and lime contents were found to be 6.5 % and 2.0%, respectively. The Marshall stability of the asphalt concrete with hydrated lime at 2% was 8.69 kN, while that of unmodified asphalt was 6.96kN, indicating that introduction of lime results in better performance. Generally, the lime modified asphalt samples had stability in the range of 4.12kN to 8.69kN, while the unmodified asphalt has stability in the range of 5.49 kN and 6.96kN. Both the lime-modified and unmodified forms conform with the General Specification, Road and Bridges. The flow values for the asphalt samples with lime were between 2.0 and 3.5 mm for 5.5% - 6.5% bitumen content, while the unmodified samples have values between 2.5 and 3.5 mm but both did not meet the specifications at higher bitumen content. The study showed that it is a good idea to introduce lime into asphalt, as it will result in production of asphalt mixture.
机译：这项研究使用马歇尔混合设计方法评估了有无熟石灰的沥青混凝土，目的是确定改性沥青混凝土所需的最佳石灰量。通过干法将熟石灰添加到具有不同百分比的熟石灰（1.0-8.0％）的沥青混合料的骨料共混物中，并且沥青含量为5.5％至7.5％。发现最佳的粘合剂和石灰含量分别为6.5％和2.0％。熟石灰含量为2％的沥青混凝土的马歇尔稳定性为8.69 kN，而未改性沥青的马歇尔稳定性为6.96 kN，表明引入石灰可带来更好的性能。通常，石灰改性沥青样品的稳定性在4.12kN至8.69kN的范围内，而未改性沥青的稳定性在5.49kN至6.96kN的范围内。石灰改性和未改性的形式均符合通用规范《道路和桥梁》。对于沥青含量为5.5％-6.5％的沥青，石灰样品的流量值介于2.0和3.5 mm之间，而未改性的样品的流量值介于2.5和3.5 mm之间，但在较高的沥青含量下均不符合规格。研究表明，将石灰引入沥青中是一个好主意，因为这将导致沥青混合料的生产。

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