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Related Concept Videos

Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

213
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...
213
Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

259
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
259
Permeability of Concrete01:25

Permeability of Concrete

235
Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
235
Slump Test01:20

Slump Test

470
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...
470
Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

309
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
309
Tensile Strength Considerations of Concrete01:16

Tensile Strength Considerations of Concrete

219
Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen...
219

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Characterising Penetrometer Tip Contact during Concrete Condition Assessment.

Richard Hall1, Alex Stumpf1, Avinash Baji1

  • 1Department of Engineering, La Trobe University, Melbourne, VIC 3086, Australia.

Sensors (Basel, Switzerland)
|February 15, 2022
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Summary

This study explored concrete penetrometer tip shapes to improve condition assessment. The squircle-shaped tip demonstrated the least slippage on concrete surfaces, enhancing reliability.

Keywords:
concretecondition assessmentremaining life assessmentremote sensing

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Geotechnical Engineering

Background:

  • Accurate concrete condition assessment is crucial for infrastructure integrity.
  • Penetrometers are used to evaluate concrete hardness, but tip slippage can cause errors.
  • Distinguishing between sound and corroded concrete requires reliable contact.

Purpose of the Study:

  • To investigate the influence of penetrometer tip shape on slippage during concrete condition assessment.
  • To identify optimal tip geometries for enhanced contact and reduced slippage.
  • To improve the reliability of penetrometer-based concrete evaluation.

Main Methods:

  • Designed and modeled a range of superellipse-parameterized cylindrical penetrometer tips.
  • Performed finite element analysis (FEA) on the parametric models.
  • Machined stainless steel penetrometer tips based on FEA results.
  • Tested tip performance on concrete surfaces at various angles.

Main Results:

  • Tip shape significantly affects slippage during concrete penetrometer testing.
  • The squircle-shaped tip exhibited the minimum slippage across tested angles.
  • This suggests a geometric solution to improve penetrometer performance.

Conclusions:

  • The squircle tip design offers superior performance for concrete condition assessment penetrometers.
  • Optimized tip geometry can mitigate slippage and enhance assessment accuracy.
  • Further research could explore other shapes and materials for improved concrete evaluation tools.