通过实验方法研究高性能混凝土中超细飞灰和烟含量的有效利用
Arava Lekhya1, N Senthil Kumar1
1School of Civil Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, 632014, India.
Heliyon
|December 3, 2024
概括
这项研究优化了可持续混凝土,将超细 (UFFA) 和烟 (SF) 混合为水泥替代品. 最好的混合物 (U10S15) 显示了增强的强度和耐久性,非常适合保留水的结构.
科学领域:
- 材料科学与工程 材料科学与工程
- 土木工程 土木工程是指土木工程.
- 可持续的建筑材料 可持续的建筑材料
背景情况:
- 传统的水泥生产是二氧化碳排放的重要来源,推动了可持续替代品的需求.
- 补充性水泥材料 (SCM),如飞灰和烟,有可能减少水泥对环境的影响.
- 优化SCM在高性能混凝土 (HPC) 中的比例对于实现所需的机械性能和耐久性至关重要.
研究的目的:
- 研究高性能混凝土 (HPC) 中超细飞灰 (UFFA) 和烟 (SF) 含量的优化.
- 评估二元混凝土和三元混凝土混合物的机械性能,耐用性和微观结构特性.
- 为了确定UFFA和SF的最佳混合物,以实现可持续和持久的混凝土应用.
主要方法:
- 生产16种混凝土混合物,具有不同水平的UFFA和SF替代物 (0-15%).
- 机械性能 (压力强度,非破坏性测试) 和耐用性 (吸水,空气含量,透性) 的评估.
- 使用X射线衍射 (XRD),热重力测量分析 (TGA) 和里埃变换红外光谱 (FTIR) 的微结构特征.
主要成果:
- 所有HPC混合物都表现出优越的质量,非破坏性测试速度超过5公里/秒.
- 三元混合物U10S15 (10%的UFFA,15%的SF) 实现了最高的压力强度 (104.28MPa在90天) 和最低的吸水率 (1.26%).
- FTIR,TGA和XRD分析证实,最佳的UFFA和SF混合产生了密集的微观结构,增强了水分.
结论:
- 优化的HPC组合 (U10S15) 具有出色的机械强度和耐久性.
- 这种混合物显著减少了水的吸收,并增强了颗粒的包装,表明对环境退化有更好的抵抗力.
- 由于其卓越的性能特性,U10S15混合物非常适合用于保留水的结构.
更多相关视频
06:27Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence
Published on: September 23, 2018
9.2K
08:00Author Spotlight: Standardizing the Development of Amine-Based Silica Composites as CO2 Adsorbents for Direct Air Capture
Published on: September 29, 2023
2.3K
相关概念视频
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
Effects of Air-entrainment in Concrete
79
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...
79
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
Fiber Reinforced Concrete
70
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...
70
Fineness of Cement
118
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...
118
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
