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Inspection and Evaluation

acoustic emission for structural health monitoring

Acoustic Emission Monitoring for Civil Infrastructure

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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?

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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

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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

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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

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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

Thickness Measurement of Concrete

NDT of Thickness Measurement for Concrete

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This articles reviews some of the most accepted and widely used nondestructive tests of thickness measurement for concrete elements. Thickness measurement can be of interest for engineers and technicians involved in the assessment of existing concrete elements, such as slabs, foundations, or pavements, or as a means of quality control (QA) in the construction of new concrete pavements. The applications and limitations of these techniques are briefly compared and discussed.… Read More »NDT of Thickness Measurement for Concrete

Setting Time of Concrete

How to Estimate The Setting Time of Concrete

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This article briefly describes the setting time of concrete, why it is important, and how different weather condition could affect it. We will later review some of existing methods that are used to estimate the setting time of concrete on-site. Setting Time of Concrete As ASTM C125-15b, setting is defined as “the process, due to chemical reactions, occurring after the addition of mixing water, that results in a gradual development… Read More »How to Estimate The Setting Time of Concrete

Earthquakes in Italy

Why Earthquakes Hit Italy and How to Reduce The Risk?

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An earthquake of magnitude 6.6 struck the center part of Italy (6 km from Norcia) for the second time since earthquake in Aug 2016. The earthquake is believed to be the strongest to hit Italy since 1800. But why is Italy so prone to earthquake? In this brief note, we will review some facts about the seismic activity in the region, the existing codes, and practice, and why collapse of… Read More »Why Earthquakes Hit Italy and How to Reduce The Risk?

Structural Effects of ASR on Concrete Structures

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Extensive mapped crack on the surface of concrete structures can be a scary observation for public, or even most structural engineers. There is a common belief among material and structural engineers that the Alkali Silica Reaction (ASR) is always harmful for a concrete structure. It is scary to drive under a ASR affected bridge. Despite this observation and speculation, no major collapse has been reported as a result of ASR… Read More »Structural Effects of ASR on Concrete Structures

maturity-method-cover-image

Maturity Method for In-Place Strength Measurement

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In this article, we will investigate the use of maturity method for in-place strength measurement. We will review the concept behind the maturity technique, and the most common practices. Later, we will describe the benefits and limitations of this method for in-place strength prediction. In the last part of this article, we will review and examine some of the existing technologies for using the maturity technique. Concrete Strength Concrete (compressive) strength… Read More »Maturity Method for In-Place Strength Measurement