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相关概念视频

Types of Cement II01:22

Types of Cement II

377
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
377
Hydration of Cement01:24

Hydration of Cement

778
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...
778
Types of Cement I01:21

Types of Cement I

333
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
333
Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

434
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
434
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

316
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...
316
Pozzolans01:21

Pozzolans

464
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...
464

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用GO/NS混合物修改的基于水泥的接材料

Longfei Lu1, Guoxiang Yang1, Yan Ai1

  • 1School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China.

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PubMed
概括
此摘要是机器生成的。

石墨烯氧化物 (GO) 和纳米盐 (NS) 增强水泥接材料的强度. 最佳的低剂量组合通过优化微观结构来改善机械性能,但高剂量会导致降解.

关键词:
基于水泥的粘合剂是基于水泥的粘合剂.石墨烯氧化物 石墨烯氧化物机械性能 机械性能 机械性能纳米-石英的使用.有协同效应的效应.

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科学领域:

  • 材料科学与工程 材料科学与工程
  • 土木工程 土木工程是指土木工程.
  • 纳米技术纳米技术

背景情况:

  • 基于水泥的接材料在土木工程中至关重要.
  • 提高它们的机械性能和可加工性是一个关键的研究领域.
  • 石墨烯氧化物 (GO) 和纳米 (NS) 显示出作为性能增强添加剂的潜力.

研究的目的:

  • 研究GO和NS对水泥接材料的单独和联合影响.
  • 阐明GO和NS之间的协同机制.
  • 确定最佳剂量范围和组合原则,以提高材料性能.

主要方法:

  • 宏观测试:设置时间,流动性,出血率,机械强度 (柔性和压力).
  • 微观结构的表征:SEM,XRD,MIP,FTIR. 这种结构的特征是:
  • 对GO和NS剂量的系统变化.

主要成果:

  • 无论是NS还是GO,都减少了设置时间和出血率,并提高了机械强度.
  • NS对流动性的负面影响大于GO.
  • 低剂量合并 (2重量%NS + 0.01重量%GO) 显著增加了曲 (13.5%) 和压力 (45.5%) 的强度.
  • 协同效应优化了水合物形态和毛孔结构.
  • 高剂量导致聚合,微观结构恶化和性能降低.

结论:

  • NS和GO之间的协同效应可以显著提高水泥接材料的性能.
  • 最佳的剂量和组合策略对于避免负面影响至关重要.
  • 这项研究为设计高性能水泥复合材料提供了基础.