Effects of air void content and back‑calculation techniques on bituminous mixture modulus via impact resonance

IF 3.9 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Jean-Claude Carret, Kevin Bilodeau, Morteza Rezaeizadeh Herozi, Lucas Babadopulos
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Abstract

This study evaluates the effect of back-calculation methods and air void content on the complex modulus of bituminous mixtures using impact resonance tests (IRT). Non-destructive IRT were performed on disk-shaped specimens of hot mix asphalt (HMA) at − 20 °C and + 23 °C to determine their resonance frequencies, which are critical for their viscoelastic characterization. Both an analytical method and a numerical back-calculation method were utilized to determine the complex modulus (dynamic modulus and phase angle) of the specimens based on IRT data. Both analytical and numerical methods yielded consistent dynamic modulus values. At − 20 °C, they ranged from 25,000 to 40,000 MPa. At room temperature, values were between 10,000 and 20,000 MPa. However, the two methods differed in their phase angle estimates, especially at higher temperatures, with discrepancies ranging from − 6° to + 3°. The study identifies limitations in current numerical back-calculation techniques, particularly regarding damping estimation, and suggests improvements in optimization procedures. The results also highlight that air void content significantly affects HMA stiffness (about 1000 MPa per % air void content), with higher air voids reducing the dynamic modulus, particularly at lower temperatures. This research advances the knowledge on application of IRT for characterizing bituminous mixtures, highlighting its potential for cost-effective characterization of HMA properties and fostering future standardization.

Abstract Image

Abstract Image

含气量及反算技术对沥青混合料冲击共振模量的影响
采用冲击共振试验(IRT)评价了反算方法和气孔含量对沥青混合料复合模量的影响。在- 20°C和+ 23°C的条件下,对热拌沥青(HMA)的圆盘状试样进行非破坏性IRT,以确定其共振频率,这是其粘弹性表征的关键。基于IRT数据,采用解析法和数值反算法确定试件的复模量(动模量和相位角)。解析法和数值法均得到了一致的动态模量值。在- 20°C时,它们的范围为25,000至40,000 MPa。在室温下,数值在10,000到20,000 MPa之间。然而,两种方法的相位角估计不同,特别是在较高的温度下,误差范围从- 6°到+ 3°。该研究确定了当前数值反计算技术的局限性,特别是在阻尼估计方面,并建议改进优化程序。结果还强调,空气空隙含量显著影响HMA刚度(约1000mpa / %空气空隙含量),较高的空气空隙降低了动态模量,特别是在较低温度下。本研究提高了红外热成像技术在表征沥青混合料方面的应用知识,突出了其在具有成本效益的表征HMA特性方面的潜力,并促进了未来的标准化。
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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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