拜耳红泥对接材料机械强度的影响
Xiran Li1,2,3, Yanna Han1,2,3,4, Guorui Feng1,2,3
1College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Materials (Basel, Switzerland)
|February 26, 2025
概括
这项研究开发了一种新的方法,用于在建筑材料中利用拜耳工艺红泥 (BRM). 通过将水玻璃和烟气脱硫石膏 (FGD) 结合起来,他们创造了一种具有增强强度和反应性的水泥接材料.
科学领域:
- 材料科学 材料科学 材料科学
- 地质化学 地质化学
- 环境工程 环境工程
背景情况:
- 拜耳工艺红泥 (BRM) 库存带来了重大的环境挑战.
- BRM含有丰富的,和,这表明它有可能作为建筑材料.
- 现有的BRM利用策略在规模和效率上是有限的.
研究的目的:
- 开发一种使用水玻璃和烟气脱硫石膏 (FGD) 协同作用的BRM新型激活策略.
- 增强BRM的pozzolanic活性和反应性,以增加其在建筑材料中的融入.
- 为在矿山岩层中密封裂而准备和描述一种水泥接材料 (BF-C).
主要方法:
- 在不同的比例下将BRM,FGD和水泥混合在一起,以制造接材料 (BF-C).
- 使用XRD,FTIR,ICP-OES和SEM-EDS研究BF-C的水化机制.
- 分析Ca/(Si + Al) 比率以了解水化协同作用和产品形成.
主要成果:
- 70%的BRM-FGD混合物达到3天和28天的强度,分别为8.94MPa和13.71MPa.
- 确定了0.94的最佳Ca / Si + Al比率,促进了早期水合产品的形成.
- 主要的水化产品包括C-S-H凝,石和C-N-A-S-H,形成密集,稳定的网络结构.
结论:
- 水杯-FGD协同作用有效地增强了BRM反应性和pozzolanic活动.
- 开发的BF-C接材料在矿山中对裂密封具有有前途的性能.
- 本研究提供了一种创新的,大规模的BRM在建筑中的利用策略,促进固体废物管理.
更多相关视频
相关概念视频
Mortar Properties
107
Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
107
Strength of Cement
120
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
120
Bonding and Strength of Aggregate
132
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
132
Testing Water Quality
102
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
102
Deleterious Substances in Aggregate
140
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
Another type of impurity is clay and fine material that...
140
Mortar
190
Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...
190


