用硫修饰的阿里特硫酸水泥的制备方法和特性
Xiaodong Li1, Guodong Kang1, Shang Dou2
1Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Nanjing 210042, China.
Materials (Basel, Switzerland)
|January 8, 2025
概括
阿利特硫氨酸 (ACSA) 水泥为普通波特兰水泥 (OPC) 提供了一个环保的替代品. 经过优化,具有特定MgO兴奋剂和硫含量的ACSA剂,在早期表现出优越的强度,减少污染.
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:
- 普通波特兰水泥 (OPC) 生产对全球二氧化碳排放作出了重大贡献.
- 阿利特硫氨酸 (ACSA) 水泥提供了一个创新的,环保的替代品.
- 了解ACSA合剂的合成和水化对于优化其性能至关重要.
研究的目的:
- 为了研究不同硫含量的ACSA克林克的合成和水合.
- 分析MgO兴奋剂对基成分和水化产品的影响.
- 评估ACSA砂的机械性能,特别是压力强度和线性膨胀.
主要方法:
- 用于料和料矿物分析的X射线衍射 (XRD).
- 异热热量计用于研究水合过程中释放的热量.
- 侵入孔径测量 (MIP) 用于孔隙结构的表征.
- 扫描电子显微镜 (SEM) 用于微观结构分析.
- 在ACSA砂上进行压力强度和线性膨胀测试.
主要成果:
- 2重%的MgO兴奋剂抵消了SO3对C3S形成的负面影响.
- 调整 KH 值和 SO3 剂量后, ACSA 结合剂的含量为 58-70% 的 C3S 和 2.0-5.6% 的 C4A3$.
- 在最佳条件下 (0.93 KH,3% SO3) 产生了63.9%C3S和2.98%C4A3$的克林克,在1d (+30.45%) 时达到26.35 MPa,在3d (+18.70%) 时达到39.41 MPa的压力强度,与PII 52.5.5.相比.
结论:
- 与传统OPC相比,ACSA水泥表现出优越的早期机械性能.
- 优化的ACSA配方显示了增加使用补充水泥材料的潜力.
- 这一发展有助于减少水泥行业的污染和碳排放.
相关概念视频
Sulfate Attack on Concrete
108
Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
Sulfates from sources like soil, groundwater, or industrial effluents...
Sulfates from sources like soil, groundwater, or industrial effluents...
108
Hydration of Cement
197
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
197
Types of Cement I
102
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...
102
Types of Cement II
93
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...
93
Alkali Aggregate Reaction in Concrete
87
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...
87
Portland Cement
202
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...
202


