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相关概念视频

Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

114
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
114
Retarders01:19

Retarders

67
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...
67
Major Losses in Pipes01:28

Major Losses in Pipes

1.0K
When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to...
1.0K
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

75
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.
75
Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

250
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
250
Frost Resistant Concrete01:29

Frost Resistant Concrete

75
Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
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相关实验视频

Updated: Jun 14, 2025

Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
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风湿学性能和实验室老化和RAP青之间的差异.

Noemi Baldino1, Olga Mileti1, Ylenia Maria Marchesano1

  • 1Department of Information, Modeling, Electronics and System Engineering (D.I.M.E.S.), University of Calabria, Via P. Bucci, Cubo 39C, I-87036 Rende, CS, Italy.

Materials (Basel, Switzerland)
|August 29, 2024
PubMed
概括

回收青路面 (RAP) 粘合剂的性能比实验室老化的青更高. 豆油可以使实验室老化的粘合剂复原,但不能自然老化的RAP粘合剂,这突出了当前老化模拟方法的局限性.

关键词:
在PAVAV中使用.衰老的衰老 衰老的衰老氧化过程中的氧化.路面铺路铺路铺路铺路铺豆油是大豆油中的一种.粘度 粘度 粘度 粘度 粘度

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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.
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 从回收青路面 (RAP) 中传统的粘合剂提取是溶剂密集型的,并且对于实地研究来说不具有成本效益.
  • 使用压力衰老容器 (PAV) 的实验室衰老是常见的,但可能无法准确地复制现实世界衰老条件.
  • 实验室和使用中的老化泥之间的差异可能会影响再生剂的选择和结果的解释.

研究的目的:

  • 为了比较通过PAV老化的青的热质行为与从RAP中提取的结合剂.
  • 为了研究大豆油 (SO) 作为复原剂对实验室老化和自然老化的青的作用.

主要方法:

  • 使用动态振荡和稳定状态测试对学性能进行比较分析.
  • 使用压力老化容器 (PAV) 和两种不同的RAP结合剂,评估老化的青.
  • 对3%大豆油 (SO) 添加剂对老化样品的影响的评估.

主要成果:

  • 与PAV老化的样相比,RAP结合剂的强度和粘度更高.
  • 添加大豆油降低了实验室老化的青中的模量和粘度,但对自然老化的RAP结合剂没有显著影响.
  • 交叉频率和风湿学参数显示,SO对老化泥类型粘度的影响存在显著差异.

结论:

  • 与PAV老化的青相比,自然老化的RAP结合剂表现出优越的性能.
  • 目前的标准老化技术不充分模拟现实世界的条件,影响了青春剂的有效性.
  • 考虑到标准测试程序的局限性,需要进一步的研究,以有效地再生或修改老化青.