推进竹纤维增强:一种使用环保植物灰处理的新方法
Hua Zhao1, Jie Tang1, Ziwei Li1
1School of Infrastructure Engineering, Nanchang University, Nanchang 330031, China.
International journal of biological macromolecules
|November 14, 2024
概括
可持续的植物灰处理显著提高了复合材料的竹纤维性能. 这种环保方法提高了抗拉强度,结晶性和热稳定性,为传统的处理提供了绿色替代方案.
科学领域:
- 材料科学 材料科学 材料科学
- 绿色化学 绿色化学
- 复合材料 复合材料 复合材料
背景情况:
- 竹纤维具有很高的特异性强度和生物降解性,但与疏水矩阵的兼容性不佳.
- 提高竹纤维特性对于其在可持续复合材料中的更广泛应用至关重要.
- 像氧化 (NaOH) 这样的传统处理方法可能是苛刻的,不太环保.
研究的目的:
- 调查可持续植物灰处理对提高竹纤维工程性能的有效性.
- 为了提高竹纤维的抗拉强度,结晶性和热稳定性.
- 将植物灰处理与传统的NaOH处理进行比较,作为一个环保的替代方案.
主要方法:
- 用不同度的植物灰溶液 (5%,10%,20%,30%) 处理竹纤维.
- 经过处理的纤维与未经处理的纤维和用常规NaOH溶液 (5%,10%) 处理的纤维进行了比较.
- 评估的关键性质包括抗拉强度,结晶度指数和热稳定性.
主要成果:
- 与未经处理的纤维相比,20%度的植物灰处理提高了14.16%的抗拉强度.
- 在植物灰处理后,结晶度指数增加到74.31%.
- 用植物灰处理的纤维具有增强的热稳定性,比用NaOH处理的纤维保留更多的残余质量.
结论:
- 植物灰处理是一种具有成本效益和环保的方法,可以增强竹纤维的特性.
- 该处理减少了纤维极性,并保留了纤维结构,从而提高了机械和热性能.
- 增强的竹纤维适合在建筑和其他行业开发可持续的复合材料.
相关概念视频
Fiber Reinforced Concrete
71
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
71
Additives and Fillers in Concrete
91
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
The...
91
Pozzolans
101
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
Fly ash is...
101
Alkali Aggregate Reaction in Concrete
88
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
88
Abrasion Resistance of Concrete
106
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
One such test is the revolving disc test, where three plates...
106
Waterproofing and Anti-Bacterial Admixtures in Concrete
74
Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
Waterproofing admixtures render concrete hydrophobic,...
74


