Enhancing accuracy and reproducibility in asphalt VOCs qualitative and quantitative analysis: Insights from laboratory studies on emission characteristics

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-10-31 DOI:10.1016/j.conbuildmat.2024.138997

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引用次数: 0

Abstract

Asphalt pavement will emit Volatile Organic Compounds (VOCs) during life cycle, posing environmental and health risks. Precise understanding of the emission characteristics of asphalt VOCs will facilitate the formulation of targeted measures for reducing emissions. Simulating the emission characteristics of VOCs from asphalt under laboratory conditions is an effective method for predicting asphalt VOCs pollution and implementing effective control measures. In this study, a quality control method for qualitative and quantitative detection of asphalt VOCs in laboratory settings was established based on sample storage time, asphalt sources, and temperature sensor positions. Furthermore, the study investigated the influence of mixing speed and sampling pump speed during asphalt VOCs generation on the emission characteristics. The results demonstrate that the quality control methods exhibit excellent reproducibility and reliability, making them valuable for future research and emission control strategies. Furthermore, the total concentration of asphalt VOCs increases with higher mixing speeds, but stabilizes when the mixing speed reaches 750–1250 r/min. As mixing speed increases, the proportion of alkane groups significantly decreases, while the proportion of aldehydes markedly increases, with the overall proportion remaining relatively stable. Decreasing sampling pump speed leads to a gradual increase in asphalt VOCs concentration. At lower pump speeds, a nonlinear increase in concentration occurs due to VOCs enrichment effects. Asphalt VOCs concentrations exhibit a proportional increase with sampling pump speeds exceeding 1000 ml/min. Finally, based on the results of the three-level analysis of "total concentration-group-substance" and taking into account the energy consumption, it is recommended that the mixing speed be set at 1000 r/min and the sampling pump speed be set at 1000 ml/min for the generation and collection of asphalt-related VOCs. This study can provide a reliable method for generating and collecting asphalt-related VOCs and offer critical insights for optimizing VOCs emission reduction strategies.

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提高沥青挥发性有机化合物定性和定量分析的准确性和可重复性：从实验室排放特性研究中获得的启示

沥青路面在生命周期内会排放挥发性有机化合物（VOCs），对环境和健康造成危害。准确了解沥青挥发性有机化合物的排放特性有助于制定有针对性的减排措施。在实验室条件下模拟沥青挥发性有机化合物的排放特征是预测沥青挥发性有机化合物污染和实施有效控制措施的有效方法。本研究根据样品储存时间、沥青来源和温度传感器位置，建立了实验室环境下沥青挥发性有机化合物定性和定量检测的质量控制方法。此外，研究还调查了沥青挥发性有机化合物产生过程中搅拌速度和采样泵速度对排放特征的影响。结果表明，质量控制方法具有良好的重现性和可靠性，因此对未来的研究和排放控制策略具有重要价值。此外，沥青挥发性有机化合物的总浓度随着搅拌速度的提高而增加，但在搅拌速度达到 750-1250 r/min 时趋于稳定。随着搅拌速度的提高，烷烃类的比例明显降低，而醛类的比例明显提高，总体比例保持相对稳定。降低取样泵的转速会导致沥青挥发性有机化合物浓度逐渐增加。在较低的泵速下，由于 VOCs 的富集效应，浓度会出现非线性增加。当采样泵的速度超过 1000 毫升/分钟时，沥青挥发性有机化合物的浓度呈比例增长。最后，根据 "总浓度-组别-物质 "三级分析的结果，并考虑到能耗，建议在生成和收集沥青相关 VOCs 时，搅拌速度设置为 1000 r/min，采样泵速度设置为 1000 ml/min。这项研究可为生成和收集沥青相关挥发性有机化合物提供可靠的方法，并为优化挥发性有机化合物减排策略提供重要启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.