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Related Concept Videos

Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

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The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
165
Vebe Test01:22

Vebe Test

194
The Vebe test is a method used to measure the workability of concrete, particularly effective for dry concrete mixes. This test employs a specific apparatus that includes a cylindrical chamber, a standard slump cone, and a transparent disc-shaped rider, all mounted on a vibrating table. The cylindrical chamber has dimensions of nine and a half inches in diameter and eight inches in height.
To conduct the test, concrete is placed into the slump cone. The concrete is filled in layers and...
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Slump Test01:20

Slump Test

334
The slump test is a widely used method to measure the workability of concrete. It employs a 12-inch high truncated cone mold that tapers from eight inches at the base to four inches at the top. Before testing, the mold is securely attached to a flat base and dampened.
Concrete is poured into the mold in three layers to conduct the test. Each layer is compacted 25 times with a steel tamping rod, which has a five-eighths-inch diameter and a rounded end, to ensure even distribution and eliminate...
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Design Example: Maintaining Level of an Embankment01:19

Design Example: Maintaining Level of an Embankment

102
Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
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Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

349
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
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Related Experiment Video

Updated: Aug 10, 2025

In Situ Soil Moisture Sensors in Undisturbed Soils
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Assessing Subsoil Conditions with an ASABE Conform Vertical Penetrometer-Development and Evaluation.

Oliver Schmittmann1, Peter Schulze Lammers1

  • 1Institut fuer Landtechnik, Universität Bonn, Nussallee 5, 53115 Bonn, Germany.

Sensors (Basel, Switzerland)
|February 11, 2023
PubMed
Summary
This summary is machine-generated.

A new tractor-mounted penetrometer accurately measures subsoil conditions, including water content, by minimizing friction. This tool is crucial for understanding soil health and resilience in changing climates.

Keywords:
calibrationheavy-duty penetrometerpenetration resistanceshaft frictionsoil compaction

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Area of Science:

  • Soil Science
  • Agricultural Engineering
  • Environmental Monitoring

Background:

  • Subsoil is vital for water, nutrient, and carbon storage, impacting crop yield and resilience.
  • Climate change and resource scarcity necessitate better subsoil assessment tools.
  • Existing penetrometers lack the ability to measure subsoil properties accurately due to high forces and friction.

Purpose of the Study:

  • To develop a novel tractor-mounted subsoil penetrometer for measuring conditions up to 2m depth.
  • To integrate a soil water content sensor for comprehensive subsoil analysis.
  • To overcome challenges of high penetration forces and shaft friction in compacted subsoils.

Main Methods:

  • Designed a tractor-mounted penetrometer with an ASABE standard cone and a protected rod housing an FDI moisture sensor.
  • Implemented a lateral shifting tower for single-line probing without tractor movement.
  • Evaluated performance in compacted loamy silt soil boxes and field trials against a standard penetrometer.

Main Results:

  • The developed penetrometer effectively measures penetration resistance without influence from shaft friction.
  • An optimal distance of at least 10 cm between the cone tip and protection shaft is required for accurate readings.
  • Field trials confirmed the penetrometer's stability, precision, and suitability for subsoil access.

Conclusions:

  • The developed subsoil penetrometer is a stable and precise tool for assessing subsoil properties.
  • It provides crucial data for understanding soil health, water management, and site resilience.
  • This innovation addresses a critical need for advanced subsoil monitoring in agriculture and environmental science.