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相关概念视频

Accelerators01:17

Accelerators

75
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
75
Retarders01:19

Retarders

68
Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
68
Superplasticizers01:30

Superplasticizers

84
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
84
Pozzolans01:21

Pozzolans

112
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...
112
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

94
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
94
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K

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相关实验视频

Updated: Jun 29, 2025

Negative Additive Manufacturing of Complex Shaped Boron Carbides
06:45

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针对耐火应用的先进固体地质聚合物配方.

Shaik Hussain1, Sudhir Amritphale1, John Matthews1

  • 1Trenchless Technology Center, Louisiana Tech University, Ruston, LA 71272, USA.

Materials (Basel, Switzerland)
|March 28, 2024
PubMed
概括
此摘要是机器生成的。

先进的固体地质聚合物配方表现出异常高温性能,在暴露于1100°C后保持显著的机械强度. 这些水激活材料对要求苛刻的耐火材料应用有很大的前景.

关键词:
先进的固体地质聚合物地质聚合物.压力强度的压力强度是什么耐火材料 耐火材料 耐火材料耐热疲劳的耐热性 耐热疲劳的耐热性

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Last Updated: Jun 29, 2025

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科学领域:

  • 材料科学 材料科学 材料科学
  • 陶工程 陶工程 陶工程
  • 地质聚合物化学 地质聚合物化学

背景情况:

  • 传统水泥在高温应用中由于热降解和裂变而表现出局限性.
  • 耐火材料需要在极端条件下提高机械稳定性和耐火性.

研究的目的:

  • 评估用于耐火应用的新型固体地质聚合物配方的高温性能.
  • 为了比较水激活固体地质聚合物的特性与传统的液态性地质聚合物.

主要方法:

  • 使用飞灰作为前体和氧化/酸盐作为激活剂的研究地质聚合物配方.
  • 作为地质聚合物矩阵中的耐火聚合物,纳入了聚石和.
  • 测试了高达1100°C的压力强度,并对样品进行了热循环 (1100°C).

主要成果:

  • 固体地质聚合物配方与和聚合物保持了84 MPa和64 MPa的压力强度后-1100 °C.
  • 在四个热循环后,基于穆莱特的地质聚合物达到115.2 MPa;证明了耐疲劳性.
  • 观察到600°C时强度的降低 (粘性烧结),随后在1100°C时强度的增加 (相变).

结论:

  • 先进的固体地质聚合物配方与传统材料相比,具有优越的耐火性能.
  • 在高温下形成的晶体相 (leucite,sanidine,annite) 有助于提高机械强度.
  • 用水激活的固体地质聚合物代表了对高温耐火材料应用的有希望的替代品.