Utilization of biochar derived from rice straw in petroleum bitumen: Agricultural waste recycling and pavement sustainability

Journal of Cleaner Production, Journal Year: 2025, Volume and Issue: unknown, P. 144808 - 144808

Published: Jan. 1, 2025

Language: Английский

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Study on design optimization, road performance verification and preparation process selection of hybrid fiber reinforced asphalt mixture composite

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 448, P. 138245 - 138245

Published: Sept. 7, 2024

Language: Английский

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Effect of Polypropylene and Straw Fiber Materials on the Unconfined Compressive Strength of Tailings and Wasted Stone Mixed Backfill

Materials, Journal Year: 2025, Volume and Issue: 18(2), P. 392 - 392

Published: Jan. 16, 2025

Ensuring the mechanical performance of backfill materials while reducing cementation costs is a key challenge in mine research. To address this, fiber such as polypropylene (PP) and rice straw (RS) have been incorporated into cement-based mixtures for backfilling. This study investigates effects PP RS fibers on properties, flow characteristics, microstructure Tailings Wasted Stone Mixed Backfill (TWSMB). A series orthogonal experiments were designed to evaluate influence variables, including cement-sand ratio, solid mass concentration, wasted stone content, length TWSMB properties. The results indicate that ratio concentration more significant impact strength than fibers, though show stronger effect concentration. Both types enhanced specimens, with exhibiting reinforcing fiber. Furthermore, content was pronounced length, whereas opposite trend observed optimum parameter levels determined each type: performed best at 1.5% 6 mm, showed optimal 1.0% 5-10 mm. Macroscopic damage analysis indicated structural integrity residual compressive specimens preserved even after surpassing ultimate strength, due crack-bridging fibers. Microstructural fiber-reinforced exhibited dense structure formed through reactions other hydration products. In contrast, surface nearly fully encapsulated by products, resulting formation physical skeleton structure. provides new insights minimizing cement consumption backfilling mining operations.

Language: Английский

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Understanding Toughening Mechanisms and Damage Behavior in Hybrid-Fiber-Modified Mixtures Using Digital Imaging

Buildings, Journal Year: 2024, Volume and Issue: 14(8), P. 2562 - 2562

Published: Aug. 20, 2024

Pavement cracking is a primary cause of early damage in asphalt pavements, and fiber-reinforcement technology an effective method for enhancing the anti-cracking performance pavement mixtures. However, due to multi-scale dispersed structure mixtures, it challenging address with single fiber type or fibers same scale. To investigate toughening mechanisms behavior hybrid-fiber-modified we analyzed fracture process these mixtures using combination basalt calcium sulfate whisker hybrid modification, along semicircular bending tests. Additionally, digital imaging was employed examine interface characteristics, revealing at play. The results demonstrated that effectively broaden toughness range modified mixture temperature, reduce stiffness, increase residual load displacement, improve crack resistance matrix. While whiskers enhanced peak mixture, their high stiffness modulus found be detrimental mixture’s toughness. analysis indicated three-dimensionally distributed form spatial network within restricting relative movement cement aggregate, delaying propagation, significantly improving overall mixture.

Language: Английский

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Performance of Bamboo Bark Fiber Asphalt Mortar Modified with Surface-Grafted Nano-SiO2

Polymers, Journal Year: 2024, Volume and Issue: 16(19), P. 2850 - 2850

Published: Oct. 9, 2024

In this study, the feasibility of using bamboo bark fibers as modifiers to enhance asphalt mortar performance was investigated. Bamboo were modified with NaOH, KH570 silane coupling agent, and nano-SiO2, their preparation methods established. The assessed for oil absorption, thermal stability, hydrophobicity. evaluated three key indicators: rutting resistance, deformation durability at high temperatures. microscopic morphology modification mechanisms also studied. results showed that NaOH increased fiber porosity surface roughness, while its hydrolysis products enabled nano-SiO2 grafting onto fibers, improving adsorption asphalt. NaOH-KH570-nano-SiO2 ternary-composite-modified (NKSBF) demonstrated superior hydrophobicity, stability mixing temperature. Among containing 3% NKSBF best based on indicators, shear strength by 96.4% softening point 7.1% compared base asphalt, ductility 1% lignin mortar. incorporation improved short-term-aged mortar, showing most significant improvement.

Language: Английский

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Properties of asphalt binder with rice straw fiber or filler and their interaction analysis using molecular dynamics simulation

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 453, P. 138954 - 138954

Published: Nov. 1, 2024

Language: Английский

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