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Application of Fly Ash Derived Zeolites in Warm-Mix Asphalt Technology

机译：粉煤灰衍生沸石在温拌沥青技术中的应用

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摘要

In recent years, numerous studies have been carried out on new technologies allowing to reduce of mix asphalt production temperatures. One of the possibilities is to foam the asphalt with “water-containing” additives, which include zeolites. So far, mainly synthetic zeolites of the Linde A structure type, obtained from chemical reagents, and natural clinoptilolite have been used in WMA technology. In this studies, the synthetic zeolites produced from fly ashes with 4 different types of crystalline structure were analyzed. Zeolite materials were characterized by textural parameters and thermal analysis. The amount of zeolite added to asphalt was 0, 3, 5, 7 wt % in relation to the weight of asphalt. Determination of dynamic viscosity was performed at two temperatures: 135 and 160 and 4 time intervals. The tests were performed for two asphalt binders: 35/50 and 100/150 penetration grade. As a conclusion, it was found that the viscosity of asphalt pastes with zeolitic materials increases with the increase in the amount of zeolite added. The increase level depends mainly on the textural parameters. The potential usefulness of fly ash derived zeolites in the process of asphalt foaming, which depends mainly on the amount of water contained in the zeolite structure and the method of its release, has been proved.
机译：近年来，已对允许降低混合沥青生产温度的新技术进行了大量研究。一种可能性是用“含水”添加剂（包括沸石）使沥青发泡。迄今为止，WMA技术主要使用从化学试剂获得的Linde A结构类型的合成沸石和天然斜发沸石。在这项研究中，分析了由具有4种不同类型晶体结构的粉煤灰生产的合成沸石。通过结构参数和热分析来表征沸石材料。相对于沥青的重量，添加到沥青中的沸石的量为0、3、5、7wt％。动态粘度的测定在两个温度下进行：135和160，以及四个时间间隔。对两种沥青粘合剂进行了测试：渗透等级为35/50和100/150。结论是，发现随着沸石含量的增加，具有沸石材料的沥青糊的粘度增加。增加水平主要取决于纹理参数。事实证明，粉煤灰衍生的沸石在沥青发泡过程中的潜在用途主要取决于沸石结构中所含的水量及其释放方法。

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