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相关概念视频

Porosity in Cement Paste01:18

Porosity in Cement Paste

184
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
184
Pore Size Distribution01:23

Pore Size Distribution

174
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
174
Soundness of Cement01:17

Soundness of Cement

206
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
206
Strength and Heat of Hydration01:29

Strength and Heat of Hydration

278
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
278
Transition Zone01:28

Transition Zone

124
The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
124
Types of Cement II01:22

Types of Cement II

139
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...
139

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相关实验视频

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Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way
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在化物暴露后,和硬化水泥中的扩散潜力.

Elke Ziehensack1, Sylvia Keßler2, Ueli Angst3

  • 1Centre for Building Materials, Technical University of Munich, Franz-Langinger-Straße 10, 81245 Munich, Germany.

Materials and structures
|May 30, 2023
PubMed
概括

水泥糊中的扩散潜力可能会影响腐蚀研究. 这项研究澄清了它们的行为,发现了由于高pH值的小潜力,但指出pH值差异可能会干扰测量.

关键词:
化物 化物这是混凝土混凝土.扩散潜力是一种扩散潜力.硬化水泥糊是一种硬化水泥糊.允许选择性的行为.它们的pH值为pH.

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Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence
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Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures
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相关实验视频

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Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence
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Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures
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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 土木工程 土木工程是指土木工程.

背景情况:

  • 扩散潜力显著影响钢筋混凝土的腐蚀评估,需要对基于水泥的材料有更深入的了解.
  • 硬质材料的永久选择性会影响离子运输和由此产生的扩散潜力.

研究的目的:

  • 为了研究水泥糊的选择性行为及其对在强加的NaCl梯度下扩散潜力的影响.
  • 分析离子度概况,并将其与测量的扩散潜力相关联.

主要方法:

  • 使用扩散电池研究硬化普通波特兰水泥 (OPC) 和高炉水泥 (BFC) 糊.
  • 采用激光剥离感应合等离子体质谱法 (LA-ICP-MS) 进行Cl,Na,K和Ca度概况的高分辨率 (100微米) 测定.
  • 测量了各种水-水泥比率 (0.30-0.70) 的水泥糊样本的扩散潜力.

主要成果:

  • 高炉水泥 (BFC) 糊表现出明显的Cl-和Na+流动性,这表明了永久选择性.
  • 尽管具有永久选择性,但由于高孔溶液pH值 (13-14),在所有面料中测量的扩散潜力很小 (-6到+3mV),由于高孔溶液pH值 (13-14).
  • 通过扩散细胞设置的pH差异被发现会干扰精确的扩散潜力测量.

结论:

  • 水泥材料中的高pH水平减轻了扩散潜力,但pH梯度可能会引入测量错误.
  • 精确测量水泥中的扩散潜力需要仔细考虑和控制pH值差异.
  • 了解离子流动性和永久选择性对于可靠的混凝土结构腐蚀监测至关重要.