Effects of dry and wet mixing times on the quality of asphalt concrete

IF 8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Jia-Ruey Chang, Yi-Ting Lo, Yi-Yu Lo
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Abstract

The quality of asphalt concrete is affected by dry and wet mixing times, which often rely on the operator’s experience. This study was conducted at an asphalt plant to examine batch size (1, 2, 3 tons), dry mixing time (5, 10, 20 s), and wet mixing time (35, 40, 50 s) on dense-graded asphalt concrete with a 19.0 mm nominal maximum aggregate size and 4.8 % asphalt content. For dry-mixed aggregates, visual uniformity assessment, sieve analysis, and regression analysis of gradation degradation were conducted. For wet-mixed mixtures, visual uniformity assessment, sieve analysis of extracted aggregate, and asphalt content measurement were conducted. For Marshall specimens, stability and flow were measured, and asphalt film thickness was analyzed. The results indicated that for dry-mixed aggregates, longer dry mixing time improved aggregate uniformity in small batches but caused gradation degradation. For wet-mixed aggregates, extending the wet mixing time in small batches compensated for shorter dry mixing times, showing that gradation degradation primarily results from the dry mixing phase. Larger batches showed limited impact on gradation with longer wet mixing time. However, in full batches, dry-mix-induced gradation degradation increased fine aggregate content and asphalt content variation. Results from the stability, flow, and asphalt film thickness analyses showed that increasing batch size and wet mixing time improved stability, reduced the range of stability values, and decreased the standard deviation of asphalt film thickness. The study identified the most suitable combinations of operational parameters and recommended the most appropriate production quantity for achieving the best mix quality. Overall, the experimental process presented in this study serves as a reference framework for selecting the appropriate dry and wet mixing times under different mixers, aggregate gradations, or production needs.
干湿搅拌次数对沥青混凝土质量的影响
沥青混凝土的质量受干湿搅拌次数的影响,这往往取决于操作人员的经验。本研究在一家沥青工厂进行,对标称最大骨料粒径为19.0 mm、沥青含量为4.8% %的密级配沥青混凝土进行了批量大小(1,2,3吨)、干拌时间(5,10,20 s)和湿拌时间(35,40,50 s)的研究。对干混骨料进行了视觉均匀性评价、筛分分析和级配退化回归分析。对于湿混合料,进行了视觉均匀性评价、提取骨料的筛分分析和沥青含量测量。对马歇尔试件进行了稳定性和流动测试,并对沥青膜厚度进行了分析。结果表明,对于干混骨料,较长的干混时间可以改善小批量骨料的均匀性,但会导致级配退化。对于湿混合骨料,在小批量中延长湿混合时间补偿了较短的干混合时间,表明级配退化主要是由干混合阶段引起的。较长的湿混合时间对较大批次的级配影响有限。然而,在全批次中,干混合料引起的级配降解增加了细骨料含量和沥青含量的变化。稳定性、流动和沥青膜厚度分析结果表明,增加配料粒度和湿搅拌时间可以提高稳定性,减小稳定性值的范围,降低沥青膜厚度的标准差。研究确定了最合适的操作参数组合,并推荐了最合适的生产数量,以实现最佳的混合质量。总体而言,本研究中提出的实验过程可作为参考框架,用于在不同搅拌器、骨料级配或生产需求下选择适当的干湿混合时间。
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来源期刊
Construction and Building Materials
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.
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