基于复合活性器和响应表面方法,研究石-GGBFS活性材料的机械性能和水合特性
Lilong Wang1, Hongkai Chen2, Yannian Zhang3
1School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China.
Materials (Basel, Switzerland)
|April 24, 2025
概括
这项研究优化了使用矿尾矿 (BX) 和颗粒高炉渣 (GGBFS) 的活性化水泥材料. 最佳的组合提高了机械性能和结构密度,促进了可持续建筑.
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.
- 可持续建筑 可持续建筑
背景情况:
- 石尾矿 (BX) 面临着处置方面的挑战.
- 活性材料 (AAMs) 为波特兰水泥提供了可持续的替代品.
- 优化基于 BX 的 AAM 需要理解多因素交互.
研究的目的:
- 使用BX和GGBFS前体来优化复合混凝土材料.
- 为了确定最佳的活性剂比例和渣含量.
- 研究组合对机械性能和微观结构的影响.
主要方法:
- 响应表面方法和中央复合设计 (RSM-CCD) 进行优化.
- 用X射线衍射 (XRD),FTIR,TG-DSC和SEM-EDS进行材料表征.
- 机械性能测试 (压力强度).
主要成果:
- 最佳组成:35%的GGBFS,4%的,水玻璃模量1.3,水固体比为0.32.
- 高模型确定系数 (0.9803为3天,0.9789为28天强度).
- 形成C-S-H和C-(N) -A-S-H凝;GGBFS增强了结构密度和水化产品的分布.
结论:
- 石尾矿显示出用于固材料制备的巨大潜力.
- 优化的BX-GGBFS材料提供了更好的机械性能和微观结构.
- 这项研究有助于建设行业的可持续发展.
相关概念视频
Hydration of Cement
169
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...
169
Design Example: Managing Concrete Workability
63
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.
63
Alkali Aggregate Reaction in Concrete
69
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...
69
Fineness of Cement
111
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...
111
Pozzolans
86
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...
86
Strength and Heat of Hydration
189
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
189


