Airborne emissions of asphalt/wax blends for warm mix asphalt production
Airborne emissions of asphalt/wax blends for warm mix asphalt production
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DOI：
10.1016/j.jclepro.2017.06.247
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发表时间：
2017-10-15
影响因子：
11.1
通讯作者：
Giuliani, Felice
中科院分区：
文献类型：
--
作者：
Autelitano, Federico;Bianchi, Federica;Giuliani, Felice
在热拌沥青混合料（HMA）生产和铺路操作的各个阶段中的沥青加热过程期间，通常由燃烧产物、挥发性有机化合物（VOC）和多环芳烃（PAH）组成的烃气溶胶、蒸气和气体的复杂混合物被排放到大气中。减少这些空中沥青排放物是沥青工业和道路机构的持续问题和挑战。因此，开发了一些新的可持续和更清洁的技术，通常称为温拌沥青混合料，这些技术大大降低了制造和应用温度。尽管报道了大量的WMA方法，但有机蜡被广泛用于降低粘合剂粘度和提高沥青混合料在较低温度下的可加工性该手稿提出了一个详细的实验室调查，基于顶空气相色谱质谱法采用HS-GC/MS和光离子化检测（PID）技术，结合粘结剂或粘结剂/蜡混合物的有效贡献，评估沥青排放物中VOCs和PAHs的含量。沥青烟雾成分的特性分析，使200多个挥发性化合物的识别，同时突出了他们的外观与温度的层次关系。挥发性较低的化合物的检测仅在高于160摄氏度的温度下是可行的，该温度范围通常产生HMA。对沥青/蜡二元混合物的研究强调了蜡在减少排放方面的双重作用：一方面，它们作为流动改进剂（降低生产和铺路温度），另一方面作为烟雾抑制剂。(C)2017爱思唯尔有限公司版权所有
During the asphalt heating process in the various stages of hot mix asphalt (HMA) production and paving operations a complex mixture of hydrocarbon aerosols, vapors and gases, generally composed of products of combustion, volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs), is emitted into the atmosphere. The reduction of these airborne asphalt emissions is a continuous issue and challenge for asphalt industry and road agencies. Thus, a number of new sustainable and cleaner technologies, generally referred to as warm mix asphalts (WMA), that significantly reduce the manufacturing and application temperatures, had been developed. Despite the great number of reported WMA methodologies, organic waxes are widely used for reducing the binder viscosity and for enhancing the asphalt mixture workability already at lower temperatures (90-140 degrees C).The manuscript presents a detailed laboratory investigation, based on headspace gas chromatography mass spectrometry (HS-GC/MS) and photoionization detection (PID), which aimed to assess the content of VOCs and PAHs in the asphalt emissions, taking into account the effective contribution of binder or binder/wax blend. The characterization of asphalt fume composition has allowed the identification of more than 200 volatile compounds, highlighting at the same time a hierarchy of their appearance in relation to the temperature. The detection of the less volatile compounds was feasible only at temperatures higher than 160 degrees C, temperature range in which the HMA is generally produced. The study of the binary asphalt/wax mixtures highlighted the twofold way in which the waxes perform in reducing emissions: on the one hand they act as flow improvers (reduction of production and paving temperatures) and on the other as fume suppressants. (C) 2017 Elsevier Ltd. All rights reserved.