纳米二氧化集成混凝土的机械,微观结构,耐用性和经济评估
Ibadur Rahman1, Sagar Paruthi2, Nirendra Dev3
1Department of Civil Engineering, Jamia Millia Islamia, New Delhi, India.
Scientific reports
|November 10, 2025
概括
将纳米二氧化 (NT) 添加到混凝土中,可以显著提高其机械性能和长期耐用性. 这种基于纳米技术的方法提供了更好的强度,弹性和对恶劣条件的抵抗力,证明了建筑的经济可行性.
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.
- 纳米技术纳米技术
背景情况:
- 纳米技术为改善混凝土性能提供了先进的解决方案.
- 纳米二氧化 (NT) 被探索为增强混凝土性能的添加剂.
研究的目的:
- 研究不同剂量的纳米二氧化 (NT) 对混凝土机械性能,性和弹性的影响.
- 评估在侵袭性环境条件下NT混凝土的长期耐用性和经济可行性.
主要方法:
- 纳入NT分别为0.5%,1%和1.5%的水泥重量.
- 机械测试 (压力,分裂拉力,屈曲强度) 在28天和180天.
- 耐久性评估包括酸/暴露,RCPT,电阻,冷解和碳化试验.
- 通过扫描电子显微镜 (SEM) 进行微结构分析.
主要成果:
- 在1.5%的NT剂量下,压力强度 (在28天内达到65.20MPa,在180天内达到75.25MPa),分裂拉伸强度 (3.44MPa) 和屈曲强度 (9.5MPa) 显著改善.
- 增强对化物入,酸性攻击 (HCl,H2SO4) 和高温的抗性.
- SEM证实了NT的密集效应,改进了孔状结构并改善了矩阵结合.
- 经济分析表明,由于使用寿命延长,长期可行性.
结论:
- 纳米二氧化 (NT) 有效地提高了混凝土的机械性能和耐用性.
- 嵌入NT混凝土的混凝土表现出对环境退化和火灾的优越抵抗力.
- 多重耐久性指数对于评估纳米混凝土至关重要,因为它们可能存在差异 (例如,电阻与RCPT).
- 在混凝土中使用NT在经济上是可行的,提供显著的长期效益.
更多相关视频
11:47The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
Published on: July 4, 2017
13.9K
07:47Experimental Protocol to Investigate Particle Aerosolization of a Product Under Abrasion and Under Environmental Weathering
Published on: September 16, 2016
7.8K
相关概念视频
Abrasion Resistance of Concrete
494
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...
494
Microcracking in Concrete
416
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
416
Tensile Strength Considerations of Concrete
488
Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen...
The dimensions and shape of a concrete specimen...
488
Effects of Air-entrainment in Concrete
362
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
362
Workability of Concrete
391
The workability of concrete is a crucial property that affects its handling, placing, and finishing during construction. It describes the ease with which concrete can be mixed, placed, compacted, and finished. Workability is primarily concerned with the concrete's movement and its ability to resist internal friction and external resistance from molds and reinforcements during the application process.
Concrete's workability is determined by its resistance to internal forces that arise...
Concrete's workability is determined by its resistance to internal forces that arise...
391
Additives and Fillers in Concrete
316
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...
316
