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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...
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Updated: Aug 18, 2025

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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Bridge Non-Destructive Measurements Using a Laser Scanning during Acceptance Testing: Case Study.

Pawel Tysiac1, Mikolaj Miskiewicz1, Dawid Bruski1

  • 1EKO-TECH Centre, Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 80-233 Gdansk, Poland.

Materials (Basel, Switzerland)
|December 11, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a novel laser scanning method for non-destructive bridge acceptance testing, improving accuracy and enabling comprehensive deformation analysis for reliable structural assessment.

Keywords:
bridge load testsdeformation analysismaintenancenon-destructive testingstructural health monitoringterrestrial laser scanning

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Area of Science:

  • Civil Engineering
  • Geomatics Engineering
  • Structural Health Monitoring

Background:

  • Bridge acceptance testing is increasing, but results are often misinterpreted due to varied equipment.
  • Uncertainty in structural response makes adjusting measurement methods difficult.
  • A comprehensive observation of deformations is crucial for accurate assessment.

Purpose of the Study:

  • To propose a novel, non-destructive method for bridge acceptance testing using laser scanning.
  • To enhance measurement accuracy by integrating linear sensors with laser scanning.
  • To provide a reliable method for assessing bridge condition when data is ambiguous.

Main Methods:

  • Laser scanning measurements were taken from two positions.
  • Potentiometric sensors were used to measure linear deformations (accuracy up to 0.1 mm).
  • Data was filtered and modelled into polynomial deflection for analysis, achieving scanning accuracy up to 0.5 mm.

Main Results:

  • The novel laser scanning method allowed observation of all structure points.
  • Measurements from linear sensors significantly increased scanning accuracy.
  • Performed tests confirmed the structure's response matched Finite Element Method (FEM) model predictions.

Conclusions:

  • The proposed laser scanning approach offers a reliable method for bridge non-destructive testing.
  • Integration with linear sensors enhances accuracy and provides comprehensive deformation data.
  • The method facilitates accurate bridge assessment and approval for use.