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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

Heating Concrete Cold Weather Concreting FPRimeC Solution

Protecting Concrete in Cold Weather

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Protecting concrete in cold weather is a continuous challenge for concrete contractors and site supervisors. Placing concrete in the cold weather condition requires special preparation and protection. All necessary precautions should be taken in order to to alleviate the negative impacts of cold weather. Special curing and protection is required in most cases.  In my previous article, we reviewed what is considered cold for concrete construction, and what should be… Read More »Protecting Concrete in Cold Weather

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

Non-Destructive Evaluation of Unknown Foundations

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Non-destructive evaluation of unknown foundations and piles has gained interest among engineers and researcher over the past few years. Latest research show the effectiveness of these methods in investigating the depth and quality of existing piles, as well as in the quality assurance of new construction. Piles are structural members made of timber, steel, or concrete. Piles are used to transfer the loads of a heavy superstructure (bridge, high rise… Read More »Non-Destructive Evaluation of Unknown Foundations

Nondestructive Reliability Assessment of Structures

Nondestructive Reliability Assessment of Structures

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What is the most reliable and appropriate method for evaluating a structure? Well, that is the question we have been facing a lot lately. Clients ask for the affordable, yet precise methods to evaluate the safety and reliability of their capital intensive assets. In order to understand the situation, one needs to understand the economy of the structure under investigation, that is how far our inspection and evaluation methods can… Read More »Nondestructive Reliability Assessment of Structures

NDT Methods for Quality Control of FRP Installation

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Fiber Reinforced Polymer (FPR) materials are utilized to improve flexural strength, shear strength, and ductility of existing sub-standard structures. Concrete elements strengthened by FRP sheets at tension zone are good example. FPRs improve the tensile strength of concrete. Another great example is to improve the flexural capacity of columns through lateral confinement.   Problematic of FRP Installation Despite the advances in frp material design and fabrication, the quality control and… Read More »NDT Methods for Quality Control of FRP Installation

NDT Techniques

5 NDT Methods for Structural Evaluation

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NDT methods can be used in routine inspection projects; they can be used to follow up the state of damages in periodical checks. The other advantage of NDT methods is that they can be performed by minimum intervention to the structure. This helps prevent aggravating the problems in already damaged structure. NDT methods can be used to assess the condition of elements that do not have easy access. One example… Read More »5 NDT Methods for Structural Evaluation

Why and When to Use Concrete Piles?

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Concrete Piles and drilled shafts are an important category of foundations. Despite their relatively high cost, they become necessary when we want to transfer the loads of a a heavy superstructure (bridge, high rise building, etc.) to the lower layers of soil. Another reason for choosing a pile foundation is the condition and quality of soil layers. Based on how they transfer the load into the subsoil, piles can be… Read More »Why and When to Use Concrete Piles?