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首页> 外文期刊>The international journal of pavement engineering >Effect of laboratory foamer on asphalt foaming characteristics and foamed mixture properties
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Effect of laboratory foamer on asphalt foaming characteristics and foamed mixture properties

机译：实验室发泡剂对沥青发泡特性和发泡混合物性能的影响

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摘要

In the United States, mechanical foaming is the most popular method for producing warm mix asphalt, which is the latest technology implemented to reduce the production temperature and/or enhance the compactability of asphalt mixtures. Three commonly used commercially available laboratory foamers to produce asphalt foams include the Wirtgen WLB 10S (Wirtgen foamer), the InstroTek Accufoamer (InstroTek foamer) and the Pavement Technology Inc. Foamer (PTI foamer). Though these foamers have been widely used in research studies and construction practice, it is still unknown whether they produce asphalt foams with the same quality and quantity. In this study, asphalt foaming characteristics produced by these three laboratory foamers were measured using a non-contact test set-up consisting of a laser device and a digital camera, and compared in terms of instantaneous volume expansion, foam stability and surface area evolution of foam bubbles. Additionally, the workability, coatability and mechanical performance of foamed mixtures prepared using these same laboratory foamers were compared against the conventional hot mix asphalt (HMA). Test results indicated that foamed asphalts produced by the Wirtgen foamer had the largest volume expansion and greatest foam stability, followed by those produced by the InstroTek foamer and the PTI foamer. The optimum foaming water content (W-opt) was determined for each laboratory foamer based on the workability and coatability results of the corresponding foamed mixtures. In addition, the performance evaluation of the foamed mixtures produced at W-opt values indicated equivalent mixture stiffness but greater moisture susceptibility as compared to the conventional HMA.
机译：在美国，机械发泡是生产热拌沥青的最流行方法，这是为降低生产温度和/或提高沥青混合物的压实性而实施的最新技术。用于生产沥青泡沫的三种常用的市售实验室发泡剂包括维特根WLB 10S（维特根发泡剂），InstroTek Accufoamer（InstroTek发泡剂）和Pavement Technology Inc.发泡剂（PTI发泡剂）。尽管这些发泡剂已广泛用于研究和建筑实践中，但仍不清楚它们是否生产相同质量和数量的沥青泡沫。在这项研究中，使用由激光设备和数码相机组成的非接触式测试装置测量了这三个实验室起泡器产生的沥青起泡特性，并就瞬时体积膨胀，泡沫稳定性和表面积演变进行了比较。泡沫。另外，将使用这些相同的实验室起泡器制备的泡沫混合物的可加工性，可涂布性和机械性能与常规的热混合沥青（HMA）进行了比较。测试结果表明，维特根发泡机生产的发泡沥青具有最大的体积膨胀率和最大的泡沫稳定性，其次是InstroTek发泡机和PTI发泡机生产的沥青。根据相应泡沫混合物的可加工性和可涂性结果，确定每个实验室发泡器的最佳发泡水含量（W-opt）。此外，与常规HMA相比，以W-opt值生产的发泡混合物的性能评估表明混合物刚度相同，但湿气敏感性更高。

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