Investigation of fiber length distribution on crack resistance mechanism of basalt fiber asphalt mixture based on digital image processing technology

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

Construction and Building Materials Pub Date : 2023-08-11 DOI:10.1016/j.conbuildmat.2023.132753

Yao Zhang , Tianyi Sang , Aihong Kang , Benshuai Wang , Xing Wu , Yulong Zhao

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引用次数: 0

Abstract

Basalt fiber has been widely used to enhance the crack resistance performance of asphalt mixtures. The length of the fiber is an essential parameter to affect the reinforcement effect. However, the research on fiber length distribution (FLD) on the anti-cracking mechanism of asphalt mixtures is still limited.

This study aims to present an efficient methodology considering the FLD effect for investigating the crack resistance mechanism of basalt fiber asphalt mixture (BFAM). The X-ray computed tomography (CT) and discrete element (DE) simulation techniques are used to obtain morphological parameters of the BFAM correlated with the FLD (i.e. aggregate skeleton gap size parameters). Then, three indoor cracking tests of the BFAM at low and medium temperatures (i.e. trabecular bending test, IDEAL-CT test and SCB test) are conducted to investigate the relationship between crack resistance performance and morphological parameters. Influences of FLD on the fracture property indexes of the BFAM are discussed.

Results indicate that the optimal FLD for the best anti-cracking performance of the BFAM with a specific dense-graded gradation can be found by using digital image processing technology. The morphological parameter of the longest axis of the aggregate skeleton gap is identified as the optimal FLD, which can significantly improve the fracture energy and fracture property indices of the BFAM compared with other FLDs. Under the same fiber content, the fracture energy enhancement of BFAM with different FLDs varies from 7.63% to 106.87%. As for the fracture property indices, the enhancement of the ε_B in trabecular bending test, CT_index in IDEAL-CT test, and FI in SCB test varies from 17.42% to 39.30%, 13.00% to 162.99%, and 7.46% to 77.61%, respectively. The results demonstrate that fiber length distribution indeed impacts the cracking resistance of the BFAM. The X-ray CT and DE simulation techniques are proved to be both highly efficient approaches for seeking the optimal FLD in the BFAM.

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基于数字图像处理技术的纤维长度分布对玄武岩纤维沥青混合料抗裂机理的研究

玄武岩纤维被广泛用于提高沥青混合料的抗裂性能。纤维长度是影响增强效果的重要参数。然而，纤维长度分布对沥青混合料抗裂机理的研究仍然有限。本研究旨在为研究玄武岩纤维沥青混合料(BFAM)的抗裂机理提供一种考虑FLD效应的有效方法。利用x射线计算机断层扫描(CT)和离散元(DE)模拟技术获得了与FLD相关的BFAM形态参数(即聚集体骨架间隙尺寸参数)。然后，对BFAM进行室内中低温开裂试验(小梁弯曲试验、IDEAL-CT试验和SCB试验)，研究其抗裂性能与形态参数的关系。讨论了FLD对BFAM断裂性能指标的影响。结果表明，采用数字图像处理技术可以找到具有特定密级配的BFAM抗裂性能最佳的FLD。确定骨料骨架间隙最长轴的形态参数为最佳FLD，与其他FLD相比，该FLD可显著提高BFAM的断裂能和断裂性能指标。在纤维含量相同的情况下，不同FLDs的BFAM的断裂能增强幅度为7.63% ~ 106.87%。断裂性能指标方面，梁小梁弯曲试验的εB、IDEAL-CT试验的CTindex、SCB试验的FI增强幅度分别为17.42% ~ 39.30%、13.00% ~ 162.99%、7.46% ~ 77.61%。结果表明，纤维长度分布确实影响BFAM的抗裂性能。x射线CT和DE模拟技术都是寻找BFAM最优FLD的有效方法。

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.