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相关概念视频

Types of Cement II01:22

Types of Cement II

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 resistance.
Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is sampled...
Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
Types of Aggregate Grading01:15

Types of Aggregate Grading

Aggregate grading is crucial in economically obtaining a concrete mix with adequate strength, reasonable workability, and minimal segregation. There are four types of aggregate gradation: well-graded, uniformly (or one-sized) graded, gap-graded, and open-graded.
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
Specific Gravity of Aggregate01:19

Specific Gravity of Aggregate

Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
Aggregates Classification01:29

Aggregates Classification

Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
Petrographic classification groups aggregates based on common mineralogical characteristics. Some of the common mineral groups found in aggregates are...

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相关实验视频

Updated: Jul 12, 2026

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
06:55

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling

Published on: August 5, 2016

现代的灰色瓦克型沙子

C D Hollister, B C Heezen

    Science (New York, N.Y.)
    |December 18, 1964
    PubMed
    概括

    最近的深海核心揭示了类似古代灰色的泥沙. 这些沙子具有独特的双模尺寸分布,表明现代深平原的初级矩阵形成.

    科学领域:

    • 地质地质地质地质地质地
    • 海洋学 海洋学 海洋学
    • 沉积物学的沉积物学

    背景情况:

    • 灰岩是古代地质记录中常见的沉积岩.
    • 了解现代类比对于解释古代沉积环境至关重要.

    研究的目的:

    • 研究深海环境中现代灰色沙的发生和特征.
    • 为了比较这些现代沙子与古代灰色沙子的纹理特性.

    主要方法:

    • 分析了来自深平原的100多个深海核心.
    • 检查沙子的组成,包括框架粒 (石英,地,岩石碎片) 和矩阵.
    • 评估谷粒大小分布以确定双式模式.

    主要成果:

    • 确定了两种不同的例子,最近的泥沙沙呈现灰色的特征.
    • 观测这些沙子中的双模尺寸分布,由精心排序的框架粒和微晶矩阵产生的.
    • 纹理特征,包括双模分布,非常类似于古代灰色的特征.

    结论:

    • 现代的深平原可以容纳沉积物沉积物,这些沉积物具有以前被认为是古老灰色地带独有的特征.
    • 这些近期沙子中的微晶矩阵很可能是初级起源的.

    更多相关视频

    Sandy Soil Improvement through Microbially Induced Calcite Precipitation (MICP) by Immersion
    06:27

    Sandy Soil Improvement through Microbially Induced Calcite Precipitation (MICP) by Immersion

    Published on: September 12, 2019

    Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
    07:32

    Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.

    Published on: June 4, 2021

    相关实验视频

    Last Updated: Jul 12, 2026

    Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
    06:55

    Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling

    Published on: August 5, 2016

    Sandy Soil Improvement through Microbially Induced Calcite Precipitation (MICP) by Immersion
    06:27

    Sandy Soil Improvement through Microbially Induced Calcite Precipitation (MICP) by Immersion

    Published on: September 12, 2019

    Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
    07:32

    Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.

    Published on: June 4, 2021

  • 这一发现为了解古代格雷瓦克沉积物的形成和解释提供了现代的模拟方法.