采用GA的MWCNT分散及其对基于铜尾矿的水泥材料的应用
Bingzhi Xiang1, Ruifeng Cheng1, Jielu Zhu1
1School of Urban Construction, Jiangxi University of Technology, Nanchang, 330098, China.
Scientific reports
|September 26, 2023
概括
阿拉伯有效地在水中分散疏水的多壁碳纳米管 (MWCNTs),防止铜尾矿水泥材料 (CTCM) 的聚合. 这有助于改善CTCM.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 土木工程 土木工程是指土木工程.
背景情况:
- 疏水性多壁碳纳米管 (MWCNTs) 在水中分散性差,导致水泥复合材料中的聚合问题.
- 基于铜尾矿的水泥材料 (CTCM) 需要更广泛的工业应用来提高性能.
研究的目的:
- 开发使用阿拉伯 (GA) 来改善CTCM的MWCNTs的稳定分散.
- 研究GA稳定MWCNTs对CTCM的机械性能,微观结构和耐久性的影响.
主要方法:
- 协同优化GA度,低频超声波处理时间和MWCNT分散的环境温度.
- 紫外线-Vis光谱测试以评估分散稳定性 (聚合面积和光束大小).
- 使用SEM,XRD和EDS对CTCM进行表征,以评估微结构变化和属性增强.
主要成果:
- 使用1.7 mmol/l GA,实现了高度稳定的MWCNT-GA分散,聚合面积<1.2%和光束大小<219 nm.
- 结合GA稳定MWCNT的CTCM在28天后显示压力强度增加了21.5%,曲强度增加了20.5%.
- 观察到CTCM的优化微观结构和显著改善的机械性能和耐用性.
结论:
- 阿拉伯是一种有效的,无毒的表面活性剂,用于创建稳定的MWCNT分散.
- 这种方法克服了MWCNT在水溶液中的分散挑战和在水泥材料中的重新聚合.
- 这些发现为低成本工业化尾矿水泥基复合材料提供了突破性进展.
相关概念视频
Fineness of Cement
152
The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
Direct...
152
Types of Cement II
124
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
124
Ferrocement
206
Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...
206
Portland Cement
240
Portland cement is the essential binding ingredient in concrete, made from finely ground materials including lime, iron, silica, and alumina. Lime is derived primarily from limestone, marble, marl, seashells, and clays, which also supply iron and alumina, while silica is sourced from sand, chalk, and bauxite. Contemporary manufacturing of Portland cement is a significant source of carbon dioxide emissions, prompting research into reducing its content in concrete through alternative...
240
Types of Cement I
141
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
141
Aggregate Cement Ratio
259
The Aggregate Cement ratio refers to the weight of aggregate divided by the weight of cement in a concrete mix. Altering this ratio has profound effects on the concrete's properties. This ratio plays a pivotal role in determining the strength, workability, and durability of concrete. When the Aggregate Cement ratio is higher, the mix is leaner, meaning it has less cement paste to lubricate the aggregate, potentially making the concrete less workable. Such mixes, known as lean, enhance the...
259


