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Related Concept Videos

Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

128
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
128
Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

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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...
81
Segregation in Fresh Concrete01:16

Segregation in Fresh Concrete

76
Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

63
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.
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Effect of Sea Water on Concrete01:22

Effect of Sea Water on Concrete

116
Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks,...
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Sieve Analysis and Grading Curves01:19

Sieve Analysis and Grading Curves

234
Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps:
234
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  3. Research Domains
  5. Environmental Sciences
  7. Soil Sciences
  9. Soil Physics
  11. Analysis Of Seepage Failure Mechanism In Silty-fine Sand And Its Prevention And Control Research.
  1. Home
  3. Research Domains
  5. Environmental Sciences
  7. Soil Sciences
  9. Soil Physics
  11. Analysis Of Seepage Failure Mechanism In Silty-fine Sand And Its Prevention And Control Research.

Related Experiment Video

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores
09:32

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

Published on: November 20, 2014

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Analysis of seepage failure mechanism in silty-fine sand and its prevention and control research.

Pengfei Qin1

  • 1Engineering Department, Huanghe University of Science and Technology, Zhengzhou, 451000, China. 202302002@hhstu.edu.cn.

Scientific Reports
|May 6, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Groundwater seepage in silty-fine sand causes foundation damage. Grouting techniques and materials are proposed to improve soil properties and prevent infiltration erosion, enhancing engineering project quality.

Keywords:
Flowing soilMechanism analysisPipe surgeResearch on grouting prevention and control

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

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores
09:32

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

  • Geotechnical Engineering
  • Hydrogeology

Background:

  • Groundwater seepage in silty-fine sand layers can lead to infiltration erosion.
  • This erosion causes uneven settlement and structural damage to foundations and underground infrastructure.
  • Understanding flowing soil and piping mechanisms is crucial for addressing these issues.

Purpose of the Study:

  • To analyze the mechanisms of flowing soil and piping caused by groundwater seepage.
  • To propose effective grouting techniques to improve the physical and mechanical properties of silty-fine sand layers.
  • To prevent infiltration damage in foundation and underground structures.

Main Methods:

  • Analysis of flowing soil and piping mechanisms.
  • Explanation and analysis of infiltration, splitting, and compaction grouting mechanisms.
Silty-fine sand layer
  • Review and discussion of various grouting materials.

    • Main Results:

    • Identified flowing soil due to effective particle gravity and piping as fine particle migration.
    • Detailed the mechanisms of different grouting methods.
    • Compiled a list of potential grouting materials including plant glue modified cement, sodium silicate, geopolymer, microbial solution, nano silica sol, emulsified asphalt, and polyurethane.

    Conclusions:

    • Grouting is a viable technical measure to enhance silty-fine sand layers.
    • The study provides a foundation for selecting appropriate grouting materials and methods.
    • The findings aim to improve the quality and durability of engineering projects in silty-fine sand environments.