含有碳纳米管的可持续混凝土的耐用性和环境评估
Yi Jing1, Jin Chai Lee2, Wei Chek Moon1
1Department of Civil Engineering, Faculty of Engineering, Technology and Built Environment, UCSI University, Kuala Lumpur, 56000, Malaysia.
Scientific reports
|February 5, 2025
概括
这项研究表明,将多壁碳纳米管 (MWCNT) 添加到米灰混凝土中,可以提高耐用性和机械性能. 这种绿色混凝土为建筑业提供了可持续的解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 环境科学 环境科学
背景情况:
- 建筑行业面临着重大的环境挑战.
- 生态可持续的绿色混凝土提供了一个可行的解决方案.
- 米灰 (RHA) 是一种潜在的补充性水泥材料.
研究的目的:
- 研究多壁碳纳米管 (MWCNTs) 对RHA混凝土性能的影响.
- 用RHA和MWCNT来评估混凝土的机械性能和耐久性.
- 评估开发的混凝土的可持续性和环保性.
主要方法:
- 准备了四种混凝土混合物,其中RHA (15%) 和MWCNT (0-0.20%) 的百分比不同.
- 分析了机械特性 (密度,弹性模量,压力强度) 和耐久性特性 (吸附性,抗硫酸攻击,抗酸攻击,干燥收缩).
- 使用Sakata,GL 2000,B3,ACI 209和CEB-FIP模型预测了干燥收缩,并与实验结果进行了比较.
主要成果:
- 添加0.1%的MWCNTs和15%的RHA显著改善了混凝土的耐用性.
- 密度和弹性模量增加了0.1-0.2% MWCNTs.
- 28日度下降了4.64-28.76%的时间.
- 对硫酸盐攻击的抵抗力 (质量损失,压力损失) 分别增加了50.93-61.71%和25.28-48.47%.
- 抗酸攻击 (质量损失) 的抗性增加了3.7-35.97%.
- 120天干燥的收缩阻力提高了3.08-9.23%.
- 萨卡塔和B3模型准确地预测了干燥收缩.
结论:
- 在RHA混凝土中的MWCNT显著提高了机械性能和耐久性.
- 开发的绿色混凝土是环保和可持续的.
- MWCNT显示出在可持续混凝土建筑中使用的巨大潜力.
相关概念视频
Abrasion Resistance of Concrete
102
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...
102
Fiber Reinforced Concrete
67
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...
67
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
Fatigue Strength of Concrete
162
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
162
Toughness and Hardness of Aggregate
240
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
240
Additives and Fillers in Concrete
88
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...
88


