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相关概念视频

Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

128
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...
128
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

103
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.
103
Response Surface Methodology01:16

Response Surface Methodology

191
Response Surface Methodology (RSM) is a collection of statistical and mathematical techniques used to develop, improve, and optimize processes. It is particularly valuable when many input variables or factors potentially influence a response variable.
The process of RSM involves several key steps:
191
Specific Gravity of Aggregate01:19

Specific Gravity of Aggregate

310
Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
310
Quantifying and Rejecting Outliers: The Grubbs Test01:02

Quantifying and Rejecting Outliers: The Grubbs Test

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Sometimes, a data set can have a recorded numerical observation that greatly  deviates from the rest of the data. Assuming that the data is normally distributed, a statistical method called the Grubbs test can be used to determine whether the observation is truly an outlier.  To perform a two-tailed Grubbs test, first, calculate the absolute difference between the outlier and the mean. Then, calculate the ratio between this difference and the standard deviation of the sample. This...
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Types of Aggregate Grading01:15

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Aggregate grading is crucial in economically obtaining a concrete mix with adequate strength, reasonable workability, and minimal segregation. There are four types of aggregate gradation: well-graded, uniformly (or one-sized) graded, gap-graded, and open-graded.
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
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相关实验视频

Updated: Jul 29, 2025

Author Spotlight: Optimization of Processing Technology for Tiebangchui with Zanba Based on CRITIC Combined with Box-Behnken Response Surface Method
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通过使用基于Taguchi的灰色关系分析来优化高性能低pH接材料的多响应优化.

Zengzeng Ren1, Weiquan Zhao1, Ju Wang2,3

  • 1State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resource and Hydropower Research, Beijing 100038, China.

Materials (Basel, Switzerland)
|May 27, 2023
PubMed
概括

这项研究开发了一种改进的低pH接材料,用于放射性废物存储库,使用微细水泥和烟. 优化的混合物表现出更好的强度和稳定性,保持pH值低于11以确保长期安全.

关键词:
塔古奇格雷关系分析硫酸酸是一种硫酸.低pH料材料的料材料.微型精密水泥是如何使用的正角测试试验 正角测试试验烟雾中的二氧化.泥的性能 泥的性能

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科学领域:

  • 材料科学 材料科学 材料科学
  • 地质技术工程 地质技术工程
  • 核工程 核工程是指核工程.

背景情况:

  • 低pH接材料对于密封高水平放射性废物储存库 (HLRW) 至关重要.
  • 微细水泥 (MC) 和烟 (SF) 构成了广泛使用的二元低pH接材料 (MCSF64) 的基础.
  • 提高MCSF64的性能对于仓库完整性至关重要.

研究的目的:

  • 开发一种基于MCSF64的高性能接材料.
  • 为了优化MCSF64与纳夫他林超塑剂 (NSP),硫酸 (AS) 和联合膨胀剂 (UEA) 的混合比例.
  • 评估所开发的接材料的风学,机械和耐久性特性.

主要方法:

  • 使用直角实验来系统地改变成分比率并评估泥的特性.
  • 塔古奇-格雷关系分析确定了最佳的混合比例.
  • 使用宾汉模型建模了风病学性质.
  • 简化 ex-situ 浸出 (S-ESL),长度对比度和扫描电子显微镜 (SEM) 评估了硬化泥的特性.

主要成果:

  • 宾汉模型准确地预测了基于MCSF64的泥的质行为.
  • 最佳的混合物包括1.4的水/粘合剂比,其中1.9%的NSP,3.6%的AS和4.8%的UEA按粘合剂质量计算.
  • 最佳的混合物保持了孔隙溶液pH值低于11,经过120天的固化.
  • 添加AS和UEA改善了水分,减少了设置时间,增加了早期剪切强度和增强了扩张.

结论:

  • 一种高性能,低pH的接材料成功地为HLRWs开发.
  • 优化的基于MCSF64的泥表现出有利的质和机械性能.
  • 该材料表现出长期的pH稳定性和更好的耐用性,这对于核废物储存至关重要.