This technical note briefly discusses non-destructive evaluation of cold joints in concrete structures. We will review how structural engineers and quality control laboratories can utilize NDT methods to assess the quality and integrity of concrete on or around the cold joint. What is Cold Joint in Concrete? Cold joints in concrete primarily happen when there is a significant delay between different concrete pours. For examples, if there is an interruption… Read More »Non-Destructive Evaluation of Cold Joints in Concrete
Harvesting wind energy has been of special interest over the past decade. There are approximately 300 wind farms across Canada. Wind turbine structures are very complex. While the inspection of the turbine and tower has been very well developed, the literature on evaluating the quality, integrity and reliability of their foundation is relatively limited. In this article, we will review how Non-Destructive Testing of Wind Turbine Foundation can help engineers in… Read More »Non-Destructive Testing of Wind Turbine Foundation
Bridges are among the most important infrastructure facilities. So far, the inspection and testing of bridge structures have largely been limited to visual inspection, chain dragging, extracting cores, and in some cases, half-cell corrosion potential mapping. Lots of interesting research have been done by researchers around the globe to bring more innovative NDT solutions to this sector. The following article focuses on the applications of most widely used non-destructive testing for… Read More »Non-Destructive Testing for Detailed Bridge Condition Survey
Rebound Hammer test provides a practical and cost-effective solution for estimating in-place concrete strength. Recent developments in rebound hammers, and improved guidelines for estimating concrete strength can help structural engineers and condition assessment professionals in accurately classify concrete strength, and make data-informed decisions on the location of cores in a cost-effective framework. This article takes a quick look at the history of the method and recent developments. Share on linkedin… Read More »Estimate Concrete Strength Using Rebound Hammer
Pile Integrity Test (PIT) is normally performed by striking the pile head with a light hand-held hammer and recording the response of the pile using a motion transducer (i.e. accelerometer) coupled
Why We Need Structural Health Monitoring? Owners and maintenance managers of capital-intensive assets are looking for cost-effective and reliable inspection and monitoring solutions to ensure safety and reliability of these structures. Modern design codes are now looking in a much longer service life. For example, The Canadian Highway Bridge Design Code (S6-14, 2014) considers a service life of 75 years for newly constructed bridges. One good example in this case… Read More »Why We Need Structural Health Monitoring?
The Canadian Highway Bridge Design Code (S6-14, 2014) considers a service life of 75 years for newly constructed bridge. What does this mean in engineering terms? It means that the bridges of the future should have satisfactory performance, both durability and structural, during the proposed life-cycle. This can be quite challenging when we look closely; the environment and environmental loading (i.e. snow, freeze and thaw cycles, corrosion, earthquakes, etc.) can… Read More »The Future of Bridge Inspection
In this article, we will briefly present and discuss Impact-Echo (IE) method for testing concrete structures. The concept behind the technique will be reviewed. We will also study the applications and limitation of the IE method and How to Test Concrete Using Impact-Echo Method. The test method was adapted as a standard test procedure by the American Society of Testing Materials (ASTM C1383) (1), “Standard Test Method for Measuring the P-Wave… Read More »How to Test Concrete Using Impact-Echo Method?
Share on linkedin Share on facebook Share on twitter Share on telegram Share on whatsapp Share on email Concrete Imaging and Scanning are used to assess the location and extent of sub-surface defects. Different non-destructive test methods have been developed and used over the past few decades. The following article briefly describes some of these methods, and their application in the structure inspection and structural condition assessment. What is Concrete… Read More »NDT Methods for Concrete Imaging and Scanning
In a bridge structure, abutment refers to the substructure unit which supports the end of the structure (bridge span) and retains the approach fill (see Ontario Structure Inspection Manual). Abutments are commonly made of mass concrete, reinforced concrete, or wood. Usually, abutments consist of a number of components: + Foundation + Abutment wall + Ballast wall + Wing walls + Bearing seats. (Image on the right: Adapted from OSIM, 2008) Abutments can… Read More »How to Evaluate Bridge Abutments?