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Inspection and Evaluation

Reuse of existing piles and deep foundations

Reuse of Existing Piles – How NDT Can Help

Safety, reliability and satisfactory performance of structures require a well-planned maintenance program, as well as remedial actions in short and mid-term. Existing structures that are designed in accordance with older design codes or were built by older construction practices may need to be extensively repaired, rehabilitated, or replaced within the next few years. The remedial actions may include structural and/or foundation upgrade or replacement. Reuse of existing piles and foundations is… Read More »Reuse of Existing Piles – How NDT Can Help

NDE of Concrete Dams

4 Methods for Nondestructive Evaluation of Concrete Dams

Appropriate operation and maintenance of concrete dam structures are essential to ensure the safety of the structure, and reducing risk. Concrete surfaces should be examined in a regular basis to identify spalling and deterioration due to weathering, or extreme stresses, or other physical, or chemical damage mechanism. Nondestructive Evaluation of Concrete Dams can provide useful information about the condition and quality of concrete materials, extent of damages, and mechanical properties of concrete. What… Read More »4 Methods for Nondestructive Evaluation of Concrete Dams

Crack Depth Measurement in Concrete-Feature Pic

3 Methods for Crack Depth Measurement in Concrete

Share on linkedin Share on facebook Share on twitter Share on telegram Share on whatsapp Share on email Cracking is a common observation in concrete structures. Cracks can be a result of plastic shrinkage, or constructional movements. Moreover, cracks can happen as a result of overloading concrete elements, or creep. Chemical reactions such as alkali-aggregate reactions and corrosion can induce cracking. Material and Structural engineers are interested in the main… Read More »3 Methods for Crack Depth Measurement in Concrete

Half Cell Corrosion Potential Mapping

Half Cell Corrosion Mapping for Concrete

Half Cell corrosion mapping is an effective method for assessing the severity of corrosion activity in concrete structures. It is the most well-known procedure to identify the likelihood of active corrosion; however, the test does not provide any information about the kinetics of corrosion activity. The easy and cost-effective procedure of the test makes it popular among engineers and structure inspectors. The method has been used for bridge deck inspection, parking… Read More »Half Cell Corrosion Mapping for Concrete

ultrasonic testing of concrete

Ultrasonic Testing of Concrete

Ultrasonic Pulse Velocity (UPV) is an effective non-destructive testing (NDT) method for quality control of concrete materials, and detecting damages in structural components. The UPV methods have traditionally been used for the quality control of materials, mostly homogeneous materials such as metals and welded connections. With the recent advancement in transducer technology, the test has been widely accepted in testing concrete materials. Ultrasonic testing of concrete is an effective way for… Read More »Ultrasonic Testing of Concrete

acoustic emission for structural health monitoring

Acoustic Emission Monitoring for Civil Infrastructure

Acoustic Emission is referred to the radiation of acoustic waves in solids as a result of damage or any irreversible change in its internal structure. Acoustic emission monitoring is well-known for its application in structural health monitoring of civil infrastructure. Structural Health Monitoring Health monitoring is a process of implementing inspection, evaluation, reaction, re-inspection and re-evaluation in order to maintain the functionality of a system. Structural Health Monitoring (SHM) is widely used… Read More »Acoustic Emission Monitoring for Civil Infrastructure

NDE-concrete piles

How to Evaluate Concrete Piles?

Structure inspection manuals such as the Ontario Structure Inspection Manual (OSIM) mostly emphasizes on the visual inspection and physical condition of bridge structures. The visual inspection methodology in this guideline consists of close up visual assessment of defects in the superstructure and substructure. This methodology is limited to inspection of elements that are at the arms length. For elements with difficult access (i.e. long girders mid-span or deck over river or… Read More »How to Evaluate Concrete Piles?

Ultrasonic Testing of Anchor Bolts

Ultrasonic Testing of Anchor Bolts

Corrosion inspection of structural anchor bolts can be quite challenging. The reason is that access to these buried elements is often very difficult. The visible part of the bolt is usually in poor quality, and mechanical tests such as pull-out is not an option. Non-destructive ultrasonic testing of anchor bolts provide a very good method for testing the state of corrosion. Structural Anchors Structural anchors are widely used in variety… Read More »Ultrasonic Testing of Anchor Bolts

Concrete Coring Structure Inspection

Main Challenges of Concrete Coring

Taking core samples from concrete structures is required for comprehensive assessment of durability and structural performance of the structure. The compression test on core samples is known as the most reliable method for assessing the compressive strength and a means of quality control. The procedure for taking core samples and testing them has been standardized (ASTM C 42, and ACI 318). However, with all the benefits coring brings to the… Read More »Main Challenges of Concrete Coring

electrical resistivity of concrete

Electrical Resistivity of Concrete

The use of electrical resistivity method for quality control and evaluation of concrete durability is becoming very popular among scholars and engineers. The measurement of electrical resistivity of concrete provides useful information about the microstructure of concrete material. The test procedure has since been standardized by AASHTO TP 95. This method is adapted by several Department of Transportation (DOTs) to replace the labour-intensive and time-consuming methods such as the ASTM C 1202, “Electrical… Read More »Electrical Resistivity of Concrete