Effect of Temperature and Sulfate Ions on the Mode I Fracture Toughness of Waste-Based Cemented Paste Backfill With/Without Superplasticizer

IF 3.2 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-06-22 DOI:10.1111/ffe.70004

Jixiong Zhang, Gang Duan, Hongtao Wang, Mostafa Sharifzadeh, Tao Hou, Kun Fang

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Abstract

Waste-based cemented paste backfill (WCPB) is a green mining method that has been implemented in many mines in China. However, the backfilling body is exposed to many dynamic loadings, including blasting and rock cutting, which in turn affect the stability of the underground structure. The Mode I fracture toughness (K_IC) of WCPB exposed to thermal and chemical loadings is experimentally investigated in this research. The results indicate that the mechanical response and K_IC of WCPB are time dependent. The temperature-induced enhancement in cement hydration improves the fracture toughness, while the increasing sulfate content poses negative impacts on the fracture toughness, with the exception of the 2500-ppm sample cured for 28 days. Besides, the temperature-induced acceleration of cement hydration counteracts the inhibition effect caused by sulfate ions. Moreover, superplasticizers improve particle repulsion but weaken cement hydration. These findings provide a better understanding of the fracture properties of WCPB and significantly impact the operation safety and productivity of coal mines.

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温度和硫酸盐离子对加/不加高效减水剂废基胶结膏体I型断裂韧性的影响

废基胶结膏体充填法是一种绿色采矿方法，已在国内多家矿山实施。然而，回填体承受爆破、切岩等多种动荷载，影响地下结构的稳定性。实验研究了WCPB在热、化学载荷作用下的I型断裂韧性（KIC）。结果表明，WCPB的力学响应和KIC具有时间依赖性。温度诱导的水泥水化增强提高了断裂韧性，而硫酸盐含量的增加对断裂韧性有负面影响，但2500-ppm固化28天的样品除外。此外，温度诱导的水泥水化加速抵消了硫酸盐离子的抑制作用。此外，高效减水剂改善了颗粒斥力，但削弱了水泥水化。这些研究结果有助于更好地了解WCPB的断裂特性，对煤矿的安全生产具有重要意义。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.