地质聚合物混凝土的热性能与轻质聚合物
Agnieszka Przybek1,2,3, Paulina Romańska2,3, Kinga Korniejenko2,3
1CUT Doctoral School, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland.
Materials (Basel, Switzerland)
|July 12, 2025
概括
基于飞灰的地质聚合物轻质混凝土,包括扩展粘土聚合物,珍珠岩和泡地质聚合物聚合物,为烟应用提供了卓越的热和化学阻力. 这种先进的材料在高温下表现出色,非常适合用于烟道内.
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.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 传统的烟材料在热和化学抵抗方面存在局限性.
- 地质聚合物提供了卓越的高温,耐火和耐化学性.
- 研究正在探索轻质地质聚合物混凝土,以提高性能.
研究的目的:
- 为了研究基于飞灰的轻质地质聚合物混凝土与扩展粘土聚合物 (E.C.A. ),石 (P) 和发泡地质聚合物聚合物 (F.G.A. ) 的情况.
- 评估这些复合材料的物理,机械和热性能,用于烟应用.
- 设计密度低于1200kg/m3的复合材料.
主要方法:
- 地质聚合物轻质混凝土复合材料的制造,其聚合物含量不同 (60-75 wt.%).
- 物理性质的评估:密度,厚度,吸水能力.
- 机械性质的评估:曲和压力强度.
- 热性质的分析:导热性和电阻.
- 测试高达800°C和1000°C的耐热性.
主要成果:
- 发泡地质聚合物聚合物 (F.G.A.) 60显示热导率降低了76.8%,热阻增加了140.4%.
- F.G.A./E.C.A./P 60混合物实现了高压力强度 (18.069 MPa),密度比参考混凝土低32.3%.
- F.G.A./E.C.A./P 60复合材料表现出平衡的性能:低导热率 (0.2052 W/m·K),高耐热性 (高达 1000 °C),以及良好的机械强度.
- 大多数样品都经受到了高达800°C的加热,表明了良好的热稳定性.
结论:
- 精心设计的地质聚合物轻质混凝土适用于在500-1000°C之间运行的烟和烟道管.
- 这些材料对酸性凝结物和攻击性化学物质具有抗性.
- 这项研究代表了向开发基于地质聚合物的预制烟系统迈出的重要一步.
相关概念视频
Hot Weather Concreting
126
Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
126
Mass Concreting
111
Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
111
Design Example: Managing Concrete Workability
122
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
122
Pozzolans
197
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...
197
Porosity and Absorption of Aggregate
416
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
416
Factors Affecting Workability
121
The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
121


