Abstract This article presents a new methodology developed to quantify the amount of crumb rubber used in asphalt bitumen by Total-reflection X-Ray Fluorescence (TXRF) spectrometry. For the evaluation of the crumb rubber content in rubberized binders, the samples were completely digested by microwave-assisted acid digestion in a mixture of HNO3:HF acids. TXRF spectrometry has proven to be a powerful analytical technique capable to detect up to 12 elements in these matrixes with detection limits of only a few ppb's (μg/L). From those elements, Zn was elected as indicator of recycled crumb rubber and used for its quantitative correlation. The results obtained show that the proposed methodology is capable of quantifying the content of recycled crumb rubber in asphalt bitumen in a robust, accurate and reproducible way.

中文翻译：

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用全反射 X 射线荧光光谱法定量沥青沥青中报废轮胎的再生橡胶含量

摘要 本文提出了一种新方法，用于通过全反射 X 射线荧光 (TXRF) 光谱法量化沥青沥青中使用的碎胶量。为了评估橡胶粘合剂中的碎胶含量，在 HNO3:HF 酸的混合物中通过微波辅助酸消解完全消解样品。TXRF 光谱法已被证明是一种强大的分析技术，能够检测这些基质中多达 12 种元素，检测限仅为几个 ppb (μg/L)。从这些元素中，Zn 被选为再生胶粒的指标，并用于其定量相关性。获得的结果表明，所提出的方法能够以稳健、准确和可重复的方式量化沥青沥青中再生胶粒的含量。