Investigating the influence of acid–base/KH550 composite-modified BFs on the fracture characteristics of fiber-reinforced asphalt mixtures via DEM

IF 2.8 3区工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS

Computational Particle Mechanics Pub Date : 2025-02-19 DOI:10.1007/s40571-025-00918-z

Shaowei Ni, Wenbo Luo, Zhichao Wang

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Abstract

This paper studies the effects of acid–base/KH550 composite-modified basalt fibers (BFs) on the fracture characteristics of basalt fiber-reinforced asphalt mixtures (BFRAM) via the discrete element method (DEM), providing an experimental basis for further optimization. The semicircular bending (SCB) test was conducted on BFRAM, along with DEM simulation. This study revealed that (1) compared with those of blank group A, the fracture energies of BFA, BFA-H, BFA-N, BFA-NK and BFA-HK increased by 17.2%, 33.6%, 37.4%, 39.0%, 55.0% and 56.6%, respectively, and the flexibility indices increased by 18.8%, 55.8%, 58.3%, 45.3%, 63.9% and 73.3%, respectively. Fiber modifications, especially acid etching/KH550 composite modifications, are beneficial for improving the crack resistance and toughness of BFRAM. (2) The indoor SCB load–displacement curves of the BFRAMs are located mainly in the DEM simulation area where the fiber interface coefficient (FIC) is 0.6–0.9, which proves that the surface modification of the BF is conducive to improving the adhesion of fibers and asphalt. (3) The maximum contribution rate of the fiber units to resisting the external load in the DEM sample is 6.7% (FIC = 0.9), which is 2.09 times that of the DEM sample with FIC = 0.6. In the postpeak stage, the contribution rate of fiber units in the DEM samples remained at a high level of 3.5–6.7% (FIC = 0.9).

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通过数值模拟研究了酸碱/KH550复合改性BFs对纤维增强沥青混合料断裂特性的影响

本文通过离散元法（DEM）研究了酸碱/KH550复合改性玄武岩纤维（BFs）对玄武岩纤维增强沥青混合料（BFRAM）断裂特性的影响，为进一步优化提供实验依据。在BFRAM上进行了半圆弯曲（SCB）试验，并进行了DEM模拟。研究发现(1)与空白A组相比，BFA、BFA- h、BFA- n、BFA- nk和BFA- hk的断裂能分别提高了17.2%、33.6%、37.4%、39.0%、55.0%和56.6%，柔韧性指数分别提高了18.8%、55.8%、58.3%、45.3%、63.9%和73.3%。纤维改性，特别是酸蚀/KH550复合改性有利于提高BFRAM的抗裂性能和韧性。(2) bfram的室内SCB荷载-位移曲线主要位于纤维界面系数（FIC）为0.6 ~ 0.9的DEM模拟区域，证明BF的表面改性有利于改善纤维与沥青的附着力。(3)在DEM样品中，光纤单元对外部载荷的最大贡献率为6.7% (FIC = 0.9)，是FIC = 0.6的DEM样品的2.09倍。峰后阶段，DEM样品中纤维单元的贡献率保持在3.5-6.7%的较高水平（FIC = 0.9）。

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来源期刊

Computational Particle Mechanics Mathematics-Computational Mathematics

CiteScore

5.70

自引率

9.10%

发文量

期刊介绍： GENERAL OBJECTIVES: Computational Particle Mechanics (CPM) is a quarterly journal with the goal of publishing full-length original articles addressing the modeling and simulation of systems involving particles and particle methods. The goal is to enhance communication among researchers in the applied sciences who use "particles'''' in one form or another in their research. SPECIFIC OBJECTIVES: Particle-based materials and numerical methods have become wide-spread in the natural and applied sciences, engineering, biology. The term "particle methods/mechanics'''' has now come to imply several different things to researchers in the 21st century, including: (a) Particles as a physical unit in granular media, particulate ﬂows, plasmas, swarms, etc., (b) Particles representing material phases in continua at the meso-, micro-and nano-scale and (c) Particles as a discretization unit in continua and discontinua in numerical methods such as Discrete Element Methods (DEM), Particle Finite Element Methods (PFEM), Molecular Dynamics (MD), and Smoothed Particle Hydrodynamics (SPH), to name a few.