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相关概念视频

Portland Cement01:21

Portland Cement

882
Portland cement is the essential binding ingredient in concrete, made from finely ground materials including lime, iron, silica, and alumina. Lime is derived primarily from limestone, marble, marl, seashells, and clays, which also supply iron and alumina, while silica is sourced from sand, chalk, and bauxite. Contemporary manufacturing of Portland cement is a significant source of carbon dioxide emissions, prompting research into reducing its content in concrete through alternative...
882
Types of Cement II01:22

Types of Cement II

493
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...
493
Pozzolans01:21

Pozzolans

639
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...
639
Strength of Cement01:20

Strength of Cement

669
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
669
Fineness of Cement01:15

Fineness of Cement

585
The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
585
Aggregate Cement Ratio01:21

Aggregate Cement Ratio

604
The Aggregate Cement ratio refers to the weight of aggregate divided by the weight of cement in a concrete mix. Altering this ratio has profound effects on the concrete's properties. This ratio plays a pivotal role in determining the strength, workability, and durability of concrete. When the Aggregate Cement ratio is higher, the mix is leaner, meaning it has less cement paste to lubricate the aggregate, potentially making the concrete less workable. Such mixes, known as lean, enhance the...
604

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对于水泥料的绿色材料:评估替代原材料的潜在潜力

Anja Terzić1, Jovica Stojanović2, Marija Marković2

  • 1Institute for Testing of Materials, Bulevar Vojvode Mišića 43, 11000 Belgrade, Serbia.

Materials (Basel, Switzerland)
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PubMed
概括

这项研究探讨了利用回收混凝土和替代粘土,如本托尼特和热,以在较低的温度下生产水泥. 短时间的机械预处理提高了水泥的性能,为传统水泥生产提供了一个可持续的替代方案.

关键词:
班托尼特 (bentonite) 是一种石头.混凝土的性能 混凝土的性能克林克烧结器的烧结方式机械强度 机械强度 机械强度微观结构的微观结构综合合成是一种合成.废物回收利用废物回收利用废物回收利用废物泽奥利特石是一种热带石.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 可持续建筑 可持续建筑

背景情况:

  • 减少用于生产水泥的自然资源,需要探索替代原材料.
  • 快速的城市化和对建筑材料的需求增加加剧了资源枯竭.
  • 回收混凝土和非传统的粘土为水泥制造提供了潜在的可持续解决方案.

研究的目的:

  • 评估将回收混凝土 (C&DW) 和非传统的粘土 (本托尼特,岩) 纳入合剂合成的可行性.
  • 研究降低化温度 (1300°C) 和机械预处理对水泥性能的影响.
  • 评估这些替代材料在水泥生产中替代传统原材料的潜力.

主要方法:

  • 混合设计的系统测试,结合传统和替代原材料 (回收混凝土,土石,焦岩石).
  • 研究机械预处理时间 (10-30分钟) 对粉原料粉的影响.
  • 使用XRD,FTIR和SEM/EDS分析对基相组合的表征.
  • 评估由此产生的水泥的机械性能.

主要成果:

  • 不管原材料的变化,料始终表现出重要的水泥相 (C3S,C2S,C3A,C4AF).
  • 岩石和岩石有效地取代了标准的粘土,粘土成分主导了矿物质的形成.
  • 回收混凝土充当了二氧化的来源,取代了石英砂,但没有阻碍化.
  • 短暂的机械预处理 (10分钟) 增加了水泥矿物质含量;更长的时间有不良影响.
  • 降低的化温度 (~1300°C) 产生了与普通波特兰水泥 (OPC) 相比的机械性能水泥.

结论:

  • 水泥可以在降低的温度下 (~100°C以下) 使用回收混凝土和非传统的粘土生产.
  • 短时间的机械预处理有利于增强水泥矿物质的形成和性能.
  • 这些替代水泥显示了结构混凝土应用的潜力,提供了可持续的建筑材料.