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相关概念视频

Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

90
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...
90
Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

302
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
302
Pozzolans01:21

Pozzolans

102
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...
102
Qualitative Analysis03:46

Qualitative Analysis

22.0K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
22.0K
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

74
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.
74
Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

91
The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
91

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相关实验视频

Updated: Jun 11, 2025

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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带有固体废物的活性材料的基本设计,使用机器学习.

Junfei Zhang1, Shenyan Shang1, Zehui Huo1

  • 1School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China.

Materials (Basel, Switzerland)
|September 28, 2024
PubMed
概括

机器学习使用飞灰 (FA) 和颗粒高炉渣 (GBFS) 准确预测活性材料 (AAM) 的强度. 水含量和固化期是开发高性能,可持续建筑材料的关键因素.

关键词:
活性化材料是一种活性化材料.飞行灰飞行灰是什么意思颗粒状高炉渣是一种颗粒状高炉渣.机器学习是机器学习.强度强度强度强度强度强度强度强度强度强度强度强度强

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Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
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相关实验视频

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Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
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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.
  • 计算材料科学科学 计算材料科学

背景情况:

  • 使用飞灰 (FA) 和颗粒高炉渣 (GBFS) 的活性材料 (AAM) 对可持续建筑至关重要.
  • 了解它们的强度发展对于有效的材料设计和应用至关重要.

研究的目的:

  • 使用机器学习研究基于FA-GBFS的AAM的力量发展机制.
  • 为AAMs的单轴压力强度 (UCS) 开发一个预测模型.

主要方法:

  • 从FA-GBFS AAMs发表的文献中收集了616个UCS数据点.
  • 训练并评估了四种基于树的机器学习模型,包括梯度增强回归 (GBR).
  • 利用夏普利添加式解释 (SHAP) 来识别关键的影响变量.

主要成果:

  • 梯度增强回归 (GBR) 实现了最高的预测准确性 (R值=0.970,RMSE=4.110 MPa).
  • 水含量被确定为影响强度的最重要因素,其次是固化期.
  • 建议采用最优的元素比率:Ca:Si ≈1.3,Na:Al < 1,Si:Al > 3. 这些比率是最合适的.

结论:

  • 开发的机器学习模型准确地预测了AAM的强度.
  • 这些发现为设计高性能,可持续的AAM提供了实际指导.
  • 实验室验证证实了该模型的可靠性和实际应用的潜力.